KR0123106B1 - Method for accessing the time slot - Google Patents

Abstract

The method for preventing continuous request collision caused when only one vacant slot is remained in station includes steps: a) checking usable time slot when handphone selects the nearest station; b) setting delay time of connection when only one usable time slot is remained; c) generating random number by using the set delay time and ID number of handphone; d) trying connection to the usable time slot after delay time corresponding random number; and e) registering request to the station when the connection is complete.

Description

Time slot connection method of portable terminal

1 is a schematic diagram of a portable terminal employing a DECT method.

2a and b are flowcharts of a timeslot connection method according to the present invention in a portable terminal.

* Explanation of symbols for main parts of the drawings

101: power supply unit 102: key data input unit

103: central processing unit 104: memory

109: transmission processor 110: antenna

111: reception processing unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal employing a dec (DECT) method in a wireless telephone network system. The present invention relates to a time slot access method of a portable terminal for minimizing a collision.

In general, a wireless telephone network system wirelessly establishes a network between a fixed station (or base station, hereinafter referred to as a fixed station) and a portable terminal (or mobile phone) to transmit and receive data. A portable terminal employing a DECT method for transmitting and receiving digital data is a type of mobile phone used in such a wireless telephone network system and is used for personal mobile communication in Europe.

When the power of the deck-type portable terminal is turned on, after receiving a radio signal strength indicator (RSSI) of a neighboring station, the station is set up, and a time slot that is empty in the station is registered to register with the station. Once found, the connection is attempted through an empty timeslot.

However, when there is only one empty timeslot in the set fixed station, when a connection is requested from the at least one or more other terminals at the same time using the same access method, the terminals requesting the connection are made until another timeslot becomes empty. There was a problem in that no terminal was able to connect due to continuous collision. That is, since each terminal attempts to connect in 10msec unit (frame unit) according to the Dect standard, if the user attempts to connect with the same algorithm at the same time, the terminal continuously tries to connect with the same time slot at the same time. to be.

Accordingly, an object of the present invention is to solve the above-mentioned problem, in order to solve the above problem, when there is only one free time slot in a fixed station, by adjusting a connection request time to prevent a continuous collision during time slot connection. To provide a time slot access method for the present invention.

In order to achieve the above object, a method according to the present invention includes a method for accessing a time slot of a portable terminal in a wireless telephone network system having a fixed station and a portable terminal; An investigation process for examining available time slots when the mobile station selects the nearest station in the standby mode; When there is only one available time slot in the investigation process, setting a predetermined value (MOD) for setting a delay time for accessing the portable terminal; A random number generation process of generating a predetermined random number using the set predetermined value MOD and the unique number of the portable terminal; Setting a delay time for the portable terminal to access a usable time slot using a predetermined value (MOD) included in the random number generated in the random number generation process; A connection attempt process for attempting to access a time slot in a set connection attempt delay time unit; And a registration process for performing registration with the selected adjacent fixed station when the access to the timeslot is made.

Next, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a deck-type portable terminal used in a wireless telephone network system, the power supply unit 101 for supplying power of the terminal, the key data input unit 102 for applying a control command of the operator, and the full function of the terminal. The central processing unit 103 for controlling the control and in particular for setting the delay time when the time slot is connected, the microphone 107 for converting and outputting the operator's voice signal into an electrical analog signal, the central processing unit 103 Controlled by the coded signal processing unit 108 and the central processing unit 103 to control the coded signal to change the signal output from the microphone 107 to ADPCM (ADaptive Pulse Code Modulation) data used in the decect standard. A decoded signal processor for converting the received encoded speech signal into PCM data and performing decoded signal processing to convert the received speech signal into an analog signal; 105), the speaker 106 for outputting the voice signal output from the decoded signal processor 105 as a voice signal that can be recognized by the terminal operator, an EEPROM (Electrically Erasable ROM) and ROM and RAM of the terminal Memory 104 which stores parameters for various operations and especially stores the unique number of the terminal, enables the generation of high frequency signals of 1.8 GHz, synthesized high frequency signals and ADPCM encoded voice signals, and amplification of synthesized signals. A transmission processing unit 109 which performs a reception process such as low noise amplification and intermediate frequency conversion processing for the received signal, and extracts the original signal transmitted from the intermediate frequency. The antenna 110 is configured to propagate the data output from the air in the air and output the data received in the air to the reception processor 111.

2A and 2B are flowcharts illustrating a time slot access method according to the present invention in a deck type portable terminal configured as shown in FIG.

Next, the operation of the flowcharts illustrated in FIGS. 2A and 2B will be described in detail with reference to FIG. 1.

When the power of the terminal is turned on by the terminal operator in step 201, the power supply unit 101 supplies power to the central processing unit 103. Accordingly, the central processing unit 103 proceeds to step 202 while controlling power supply to the peripheral processing circuit, and reads an initial value for each piece of hardware in the terminal from the memory 104, and uses each read value in the terminal. Initialize the hardware.

In step 203, the central processing unit 103 selects the station closest to where the terminal is currently located. The selection of adjacent fixed stations here is done in the same way as before. For example, in case of using 10 radio channels from 0 to 9, the reception station of all 10 radio channels from radio channels 0 to 9 is examined, and the station that transmits the strongest radio signal is the most This is done by selecting adjacent station.

When the fixed station is selected as described above, the flow proceeds to step 204 to examine unused (or usable) time slots in the selected fixed station. The investigation method uses a method of finding an empty slot as in the prior art. As a result of the investigation in step 204, if there is only one available time slot, the process proceeds from step 205 to step 206.

In step 206, after only one unused timeslot is examined, a MOD (MOdular number) value is set based on a frame unit. The MOD value set at this time is a value that can be arbitrarily input by an operator through the key data input unit 102 and is used as a value for setting a time for delaying connection attempt with a timeslot.

For example, when the MOD value is set to 1, the connection attempt delay time is set to make a time slot connection attempt in one frame unit of 10 msec, and when the MOD value is set to 2, in 2 frame units of 20 msec. The connection time delay time is set so that the time slot connection time is achieved.

If the MOD value is set in consideration of such a frame unit time, the process proceeds to step 207 where the central processing unit 103 reads the unique number (PMID: Portable port Mac IDentity) of the terminal stored in the memory 104 and initializes the initial value. After that, the process proceeds to step 208.

In step 208, a random number is generated using the MOD value set in step 206 and the initial value set in step 207. The random number generated is generated by arranging the initial value and the MOD value in the form of {initial value, MOD value}. For example, if the initial value is 3 and the MOD value is 2, the generated random number is {3,2}.

In step 209, the connection attempt delay time is set using the generated random number. For example, as described above, when the random number is generated as {3,2}, the central processing unit 103 is made up of 2 frame units whose time slot connection is 20 msec by the second variable `2 '. Set the delay time when connecting. If the generated random number is {3, N (an integer greater than or equal to 1)}, the delay time is set so that the time slot connection of the portable terminal is made in units of N frames of N * 10 msec.

If the connection attempt delay time is set, the central processing unit 103 proceeds to step 210 and regularly decreases the connection connection delay time set (for example, as a down count). The reduction process of step 210 continues until the set connection attempt delay time becomes zero. If the set access attempt delay time becomes 0, the process proceeds to step 212 through step 211 and attempts to connect with an unused time slot examined in step 204.

On the other hand, as a result of the unused timeslot investigation in step 204 described above, if there are two or more unused timeslots, the process proceeds directly from step 205 to step 212 and attempts to connect with the unused timeslots as before.

If the connection is not successful due to the connection attempt of step 212, the method returns to step 204 via step 213 to repeat the above-described process.

On the other hand, if the connection is successful in step 212, the process proceeds to step 213 to step 214 to register the mobile terminal. The registration process is the same as before.

When registration is performed, it is checked whether a PAGING signal (a signal raised by a call signal from a counterpart terminal) from the fixed station is received or whether a connection request control command is authorized by the operator.

That is, the process proceeds from step 214 to step 215 and checks whether a paging signal exists. As a result of the check, if there is a paging signal, since a connection is requested from another terminal, the flow proceeds to step 216 to perform a connection and release process as a call for a call. Here, the call access process is performed by first connecting the MAC (Medium Access Control) layer, then accessing the DLC (Data Link Control) layer, and then connecting the network (NETWORK) layer. It is the reverse of the connection process. The release of the call is caused by disconnection of either terminal of both terminals conducting the call. If the call path is released, the flow proceeds to step 217.

In step 217, the state of the terminal is checked. That is, it checks whether there is an error for the battery used as a power source, warns the operator to recognize when an error occurs, and selects a stationary station adjacent to the terminal based on the reception strength as performed in step 203. Inspect internal condition. In step 218, it is checked whether the power of the terminal is kept on. At this time, if the terminal is powered off, all the operations are terminated. However, if the power source remains on, the flow returns to step 204.

However, if the paging signal does not exist in step 215, the process proceeds to step 219 to check whether a connection request signal is generated by the terminal operator. As a result of the check, when the connection request signal is generated, the flow returns to step 216 and proceeds with the connection and release process for the call as described above. On the other hand, if the connection request control command by the operator is not authorized in step 219, the flow proceeds to step 217 to check the state inside the terminal as described above.

As described above, in the wireless telephone network system, the time slot connection request of each terminal is distributed by a connection attempt delay time in which a plurality of terminals are set based on one unused time slot in the same fixed station and a frame time when connected. By doing so, there is an effect that the efficiency of use of the system can be prevented from being lowered due to the continuous collision in connection with one unused timeslot.

Although the present invention has been described as the above-described embodiment, those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (2)

A method for accessing a time slot of a portable terminal in a wireless telephone network system having a fixed station and a portable terminal; An investigation step of examining available time slots when the mobile station is selected in the standby mode closest to the station; Setting a predetermined value (MOD) for setting a delay time for accessing the portable terminal when there is only one available time slot in the investigation process; A random number generation process of generating a predetermined random number by using the set predetermined value (MOD) and the unique number of the portable terminal; Setting a connection attempt delay time of the portable terminal with respect to the available timeslot by using the predetermined value MOD included in the random number generated in the random number generation process; A connection attempt process of attempting to access the time slot in units of the set connection attempt delay time; And a registration process for performing registration with a selected adjacent fixed station when the access to the timeslot is made. The method of claim 1, wherein the predetermined value (MOD) is set to an arbitrary integer value considering the number of frame units.