KR100243688B1 - Transmitting order decision method - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for determining a transmission order for each terminal using a timestamp.

2. The technical problem to be solved by the invention

The present invention is to provide a method for determining a transmission order for each terminal for determining the order of which terminal should be transmitted to a terminal waiting for transmission by using time stamp information stored when transmitting information for each service.

3. Summary of Solution to Invention

According to an aspect of the present invention, there is provided a method for determining a transmission order for each terminal applied to a centrally controlled system, the method comprising: a first step of calculating continuous transmission number information for a fixed bit rate in an order determination process for a transmission permission and comparing it with a predetermined threshold value; And a second step of allowing a transmission by selecting a predetermined terminal using a time stamp for each terminal according to the comparison result of the first step, thereby minimizing time delay when determining the transmission order for each terminal.

4. Important uses of the invention

The present invention is used for information transmission between a terminal and a base station in a mobile communication system of a multimedia broadband service.

Description

Transmission Order Determination Method by Terminal Using Timestamp Information

The present invention relates to a method for determining a transmission order for each terminal for determining a transmission order for each terminal using a time slot between a terminal and a base station in a mobile communication system for providing a multimedia broadband service. The present invention relates to a method of determining transmission order for each terminal that can minimize time delay among various conditions for satisfying quality.

In the conventional base station, the time division reservation criterion transmission permission method is applied to the terminal requesting transmission by applying a sequential round (Round Robin) method by the sequential method or a terminal waiting for transmission with the maximum stored data Has been preferentially applied, or a method of preferentially granting a terminal having a high weight by assigning a certain weight to each service type has been applied.

This conventional method not only has an inefficient element that needs to receive information on the current state from a terminal that continuously requests transmission, but also has a problem in that it does not satisfy the time delay factor according to the type of service each terminal has.

The present invention devised to solve the above problems, in order to solve the temporal delay factor which is the most important factor influencing the quality of service in the mobile communication service for the multimedia data, to the service type for the terminal waiting for transmission. Determining the transmission order for each terminal which allows the corresponding information to be layered according to the temporal priority and allows the corresponding terminal to transmit using time stamp information on whether the final transmission was performed first in time within each layered service type. The purpose is to provide a method.

1 is a configuration diagram between a terminal and a base station of a mobile communication system to which the present invention is applied;

2 is an explanatory diagram for a data transfer process between a terminal and a base station according to the present invention;

3 is a flowchart illustrating a method for determining a transmission order for each terminal according to the present invention.

* Explanation of symbols for main parts of the drawings

1: terminal

4: base station

5: ATM switch

In order to achieve the above object, the present invention provides a method for determining a transmission order for each terminal applied to a centrally controlled system, and compares a predetermined threshold value by calculating the number of continuous transmission times for a fixed bit rate in an ordering process for transmission permission. A first step of making; And a second step of allowing a transmission by selecting a predetermined terminal using a time stamp for each terminal according to the comparison result of the first step.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

1 is a configuration diagram between a terminal and a base station of a mobile communication system to which the present invention is applied. In the drawings, "1" represents a terminal, "4" represents a base station, and "5" represents an ATM switch.

First, the data type processed by the terminal is multimedia data including voice and video data, and the configuration of the terminal is composed of a personal computer (PC) or a workstation (WS). In addition, the information transmission between the terminal and the base station is allocated for each terminal in units of time slots divided into time units in the frequency domain of the wireless environment. Divided into uplink 3 destined for the base station. The data information transmitted to the base station 4 has a structure in which the asynchronous delivery mode cell 6 is communicated to communicate with the asynchronous delivery mode switching system 5 which is composed of a broadband service network. In the present invention, it is possible to minimize the time delay factor that directly affects the service quality among the characteristics of the service of data in a competitive state for transferring data from multiple terminals to one base station.

2 is a diagram illustrating a data transfer process between a terminal and a base station according to the present invention.

Each terminal has a configuration in the form of a distributed queue (10) for temporarily storing data to be transmitted until the transmission request from the base station after requesting transmission. At this time, the type of data coming into each terminal is a constant bit rate (CBR) (11), which is sensitive to time delay, and a variable bit rate (VBR), which is more sensitive to loss although it has a certain temporal delay factor. Bit Rate (12), and the available bit rate (ABR) 13, which only needs to be transmitted using a spare slot without causing a problem. And these data has a structure that flows into each terminal regardless of a certain order. Here, the basic operation form is that the terminal to be transmitted makes a request for transmission through the uplink 14 and when an acknowledgment response from the base station 16 is received through the downlink 15, the terminal transitions to the transmission standby state and waits. When the transmission permission is received from the base station through the downlink 15, it is performed in the order of transmitting data in the next timeslot.

The present invention has a structure in which each terminal is allocated a timeslot as an authorization method based on a transmission request through a base station, whereby transmission is performed. In this structure, the order of which terminal should be transmitted to the terminal waiting for transmission is determined by using timestamp information stored in each service information transmission.

3 is a flowchart illustrating a method for determining a transmission order for each terminal according to the present invention.

The basic operation cycle is performed in units of timeslots, and when the execution is completed, the basic operation cycle is always transitioned to the standby state 20 to be ready for the next cycle. In this state, when a signal synchronized to the timeslot period is received (21) by using the state information for each terminal shown in Table 1 described below, it is checked whether there is a terminal currently waiting to be transmitted (22) In this case, after the fixed bit rate transmission frequency is initialized (23), the state transitions to the standby state 20 for the next cycle. On the other hand, if there is a terminal waiting for transmission, the number of times that the fixed bit rate transmission can be continuously performed is obtained using the maximum delay time information for the fixed bit rate and the variable bit rate (24). Check if it has reached (25).

If the number of continuous bit rate continuous transmissions does not reach the limit, it is checked whether there is a terminal requesting the transmission of the fixed bit rate data (26). If there is, the time stamp stored for the terminal waiting to transmit the fixed bit rate data. The terminal selects the first transmission using the information (27), increases the number of continuous bit rate continuous transmissions (28), transmits the transmission permission to the corresponding terminal (29), and then transitions to the standby state for the next execution (20). . If there is no terminal waiting for fixed bit rate transmission, it is checked whether there is a terminal waiting for variable bit rate transmission (31), and if present, selects a terminal that has been transmitted first for the terminal waiting for variable bit rate transmission. (32), the fixed bit rate transmission count counter is initialized (33), the transmission permission is transmitted to the corresponding terminal (29), and the state transitions to the standby state 20 for the next execution. If there is no terminal waiting for variable bit rate transmission, it is checked whether there is a terminal waiting for free bit rate transmission (34), and if present, the terminal that has been transmitted first is selected for the terminal waiting for free bit rate transmission (35). ) And transmits the transmission permission to the terminal (29) and transitions to the standby state 20 for the next performance. If there is no terminal waiting to transmit the bit rate, the process is repeated from step 21 of receiving a signal synchronized with a timeslot period.

On the other hand, if the number of continuous transmissions for the fixed bit rate has reached the limit, check whether there is a terminal waiting for variable bit rate transmission (36), and if not, if the number of continuous bit transmissions has not reached the limit, A process for transmitting the same fixed bit rate is performed (26, 27, 28) and, if present, the same process (32, 33) for the variable bit rate transmission.

TABLE 1

Terminal RA status PERM Status PGBY Status data Timestamps One lie Oh yeah Oh yeah Fixed bit rate 0.0023 2 lie lie lie - - 3 Oh yeah lie Oh yeah Variable bit rate 0.0035 n To To To To To

Table 1 describes the elements constituting the state information for each terminal managed by the base station, and the state information for each terminal requests a request indicating the received state by requesting transmission in the serial number order for the terminal (RA: Request Access). Status, Permit (PERM: Permission) status indicating that the transmission is allowed in the next time slot for the terminal waiting to be transmitted, the status of sending an acknowledgment to the terminal requesting transmission and the data to be continuously transmitted to the terminal. It consists of a PGBY (Piggyback) state indicating a state, data indicating service type information of data to be transmitted when a transmission is requested, and time stamp information indicating time information most recently transmitted to a terminal in which data to be transmitted is present.

The timestamp information is used in a process of receiving information from a terminal requesting transmission or determining an order for transmission permission at a base station. That is, time information at the time point received from the terminal that is allowed to transmit is stored and used as information for permission to transmit. In the terminal where the transmission is completed, all the information of the corresponding terminal number is converted to the initialization state and is maintained until the next transmission request is received and the transmission is made.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

As described above, the present invention can most appropriately solve the temporal delay factor according to the transmission request information requested by each terminal, and at the same time, there is no need for continuous information exchange between the terminal and the base station and uses time stamp information of the base station. Since it is performed in a simple manner, it is not only structurally simple but also there is no unnecessary information exchange, thereby improving transmission efficiency between the terminal and the base station.

Claims (5)

In the transmission order determination method for each terminal applied to a centralized system, A first step of calculating continuous transmission number information for a fixed bit rate in a sequencing process for transmission permission and comparing it with a predetermined threshold value; And And a second step of allowing a transmission by selecting a predetermined terminal using a time stamp for each terminal according to the comparison result of the first step. The method of claim 1, The predetermined terminal, Method for determining transmission order for each terminal, characterized in that the terminal has been transmitted longest ago The method according to claim 1 or 2, The first step is, A third step of determining whether there is a terminal currently waiting to be transmitted by using terminal state information when receiving a signal synchronized in a time slot period; A fourth step of repeating the third step after initializing the fixed bit rate transmission count if there is no terminal waiting for transmission as a result of the determination of the third step; And As a result of the determination in the third step, if there is a terminal waiting to be transmitted, after calculating the fixed bit rate transmission frequency information using the maximum delay time information for the fixed bit rate and the variable bit rate, whether the fixed bit rate continuous transmission number reaches the threshold value; And a fifth step of checking. The method of claim 3, wherein The second step, A sixth step of determining whether there is a terminal requesting transmission of fixed bit rate data or a terminal requesting transmission of variable bit rate data; As a result of the sixth step, if there is a terminal requesting transmission of the fixed bit rate data, the terminal that has been transmitted first is selected and fixed using the timestamp information stored for the terminal waiting to transmit the fixed bit rate data. A seventh step of increasing the number of bit rate continuous transmissions, transmitting a transmission permission to a corresponding terminal, and then transitioning to a standby state; As a result of the determination of the sixth step, if there is a terminal requesting the transmission of the variable bit rate data, the terminal which has been transmitted first is selected and fixed using the timestamp information stored for the terminal waiting to transmit the variable bit rate data. An eighth step of initializing the number of bit rate continuous transmissions, transmitting a transmission permission to a corresponding terminal, and then transitioning to the standby state; and As a result of the sixth step determination, if there is no terminal requesting transmission of the fixed bit rate and variable bit rate data, the terminal is first transmitted using the timestamp information stored for the terminal waiting to transmit the spare bit rate data. And a ninth step of transmitting a transmission permission to the corresponding terminal after the selection and transitioning to the standby state. The method of claim 4, wherein The terminal-specific state information of the third step, A request access (RA) state indicating a received state by requesting transmission in a serial number order to a terminal; A permission state (PERM) indicating a state in which transmission is permitted in a next time slot for a terminal waiting to be transmitted; A PGBY (Piggyback) state indicating a state in which an acknowledgment is transmitted to a terminal requesting transmission and a state in which data to be continuously transmitted exists in the terminal; Data representing service type information of data to be transmitted when a transmission is requested; And Method for determining the transmission order for each terminal using timestamp information, characterized in that it includes time information most recently transmitted to a terminal having data to be transmitted.

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