KR0154457B1 - Time slot connecting method of portable unit - Google Patents

Abstract

The present invention provides a time slot access method for minimizing collision when accessing a time slot by selecting a time slot to which a mobile terminal can attempt to connect using a number of free time slots provided in a fixed station in a wireless telephone network system. The present invention relates to a method for resolving a time slot usable in a fixed station when a collision occurs upon access to a corresponding time slot; Generating a predetermined random number arranged in the order of initial value and reference value by setting the number of timeslots surveyed as a reference value and setting a unique number of a corresponding portable terminal as an initial value; Setting a predetermined connection attempt delay time for a corresponding timeslot to which connection is to be attempted by the generated predetermined random number; If a predetermined connection attempt delay time has elapsed, the process includes a process proceeding to a connection attempt process.

Description

Time slot connection method of portable terminal

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

2 is a flowchart of a time slot access 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 140: antenna

141: 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. In particular, the present invention relates to a collision that may occur when the portable terminal is connected to a time slot in a fixed station. The present invention relates to a time slot access method of a portable terminal for minimizing.

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

In order to use a time slot, such a deck type portable terminal examines a radio signal strength indicator (RSSI) of an adjacent fixed station, finds an empty time slot, and attempts to connect through the empty time slot. do. However, when access to an empty timeslot is requested from at least one or more other terminals at the same time in the same access method, a plurality of timeslots are empty and the collision occurs due to concentration on one timeslot. There was.

Accordingly, an object of the present invention is to provide a time slot access method for selecting a time slot to which a portable terminal can attempt to connect by using the number of free time slots provided in a fixed station in a wireless telephone network system to solve the above problem. To provide.

According to an aspect of the present invention, there is provided a method of a time slot connection method of a portable terminal in a wireless telephone network system having a fixed station and a portable terminal; A first investigation process of examining available timeslots when the mobile station is selected in the standby mode nearest the station; A first random number generation step of generating a first predetermined random number corresponding to the number of timeslots irradiated in the first irradiation step; A first timeslot selection process of selecting empty timeslots in order corresponding to the first predetermined random number generated in the first random number generation process; A connection attempt process of attempting to access a selected timeslot; A registration process for performing registration with the selected adjacent fixed station if the connection is successful by the connection attempt process; A second investigation step of re-examining timeslots available in the fixed station if a collision occurs in the connection attempt process; A second random number generating a second predetermined random number in which the number of timeslots irradiated in the second investigation process is set as a reference value and the unique number of the corresponding portable terminal is set as an initial value and arranged in the order of (initial value, reference value) Generation process; Setting a predetermined connection attempt delay time for a corresponding timeslot to which connection is attempted by a second predetermined random number generated in a second random number generation process; When a predetermined connection attempt delay time elapses, a process including a process of access attempting is performed.

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. Central processing unit 103 for controlling and performing other functions including random number generation function for time slot selection, a microphone 107 for converting and outputting an operator's voice signal into an electrical analog signal, and a central processing unit ( To the coded signal processing unit 108 and the central processing unit 103 which control the coded signal so as to change the signal output from the microphone 107 to ADPCM (ADaptive Pulse Code Modulation) data which is controlled by the standard. A decoded signal for converting the received encoded speech signal controlled by the PCM data into PCM data and performing a decoded signal processing to be converted into an analog signal It is configured to include a processing unit 105, a speaker 106 for outputting the audio signal output from the decoding signal processing unit 105 as a voice signal that can be recognized by the terminal operator, an EEPROM (Electrically Erasable ROM), ROM and RAM Memory 104 for storing parameters for various operations of the terminal, in particular for storing the unique number of the terminal, generating high frequency signals of 1.8 GHz, transmitting the generated high frequency signals and ADPCM encoded voice signals, and amplifying the synthesized signals. A transmission processing unit 109 for processing such that it is possible, a low noise amplification and intermediate frequency conversion processing for the received signal, and a reception processing unit 111 for performing reception processing such as extracting the original signal transmitted from the intermediate frequency, and a transmission processing unit ( And an antenna 110 for propagating data output from the air 109 in the air and outputting the data received in the air to the reception processing unit 111.

2 is a flowchart of a time slot access method according to the present invention operated in a deck type portable terminal configured as shown in FIG.

Next, an operation of the flowchart shown in FIG. 2 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 hardware in the terminal from the memory 104, and uses the initial value read in each of the terminals in the terminal. Initialize the hardware.

In operation 203, a station (not shown) located closest to the current terminal is selected. 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 fixed station that investigates the reception strength of all 10 radio channels from radio channels 0 to 9 and transmits the strongest radio signal among them It is done by selecting.

When the fixed station is selected as described above, the process proceeds to step 204 to examine the number of available time slots among the time slots in the selected fixed station.

The investigation method uses a method of finding an empty timeslot as in the prior art. In operation 205, the number of usable available time slots is set as a MOD (MOdular number) value. That is, if the number of available timeslots is three, the MOD value is set to three, if two, the MOD value is set to two, and if there are N, the MOD value is set to N.

If the MOD value is set, the process proceeds to step 206 and reads the unique port number (PMID; Portable Port Mac IDentity) of the terminal stored in the memory 104 to set the initial value of the random number to be generated.

When the initial value and the MOD value of the random number to be generated are set through steps 205 and 206, the process proceeds to step 207 to generate a predetermined random number. In this case, the random number is used using the initial value set in step 206 and the MOD value set in step 205. That is, it is generated in a structure in which the initial value and the MOD value are arranged in the form of (initial value, MOD value). For example, if the initial value is 3 and the MOD value is 3, the generated random number is {3, 3}. If the initial value is 3 and the MOD value is N, the random number generated is {3, N}.

In step 208, the generated random number is analyzed, and a corresponding one empty timeslot is selected for connection. That is, an attempt is made to select an empty timeslot as a corresponding timeslot in an order corresponding to the MOD value in the random number. For example, if the MOD value included in the generated random number is 3, the third time among the empty time slots is selected as the corresponding time slot and attempts to connect. If the MOD value included in the random number is N, an attempt is made to select the Nth empty timeslot as the corresponding timeslot among the empty timeslots.

If a collision-time collision occurs for the selected timeslot, the process proceeds from step 209 to step 210 to examine available timeslots in the fixed station. In step 211 and step 205, the number of usable timeslots is set as the MOD value, and in step 212, the terminal unique number is set as an initial value of a random number to be generated.

The flow proceeds to step 213 to generate a predetermined random number using the initial value and the MOD value as in step 207. In operation 214, a time delay for the access attempt for the corresponding timeslot is set. At this time, the time for delaying connection attempt is set using the initial value of the generated random number. For example, if the initial value of the random number is 3, the delay time is set so that a delay is performed for 3 frames and a connection to the corresponding timeslot is attempted.

As a result of the check in step 215, if the set delay time has not elapsed, the process proceeds to step 216 to reduce the set delay time by a predetermined time, and then proceeds to step 215 to check whether the delay has been performed by the set time. As a result of the check, if the delay is not made for the set time, the process proceeds to step 216 to decrease the delay time value and proceeds to step 215 to repeat the above-described check process. However, if a delay is delayed by a predetermined time as a result of the check in step 215, the process proceeds to step 217 and attempts to access the corresponding timeslot identified by the generated random number again. If the connection is successful, the process proceeds from step 218 to step 219 to perform registration. The registration process is the same as before.

On the other hand, if the collision for the timeslot selected in step 208 does not occur, the process proceeds directly to step 219 through step 209 to perform the registration process.

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.

In operation 220, it is checked whether a paging signal is present. 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 221 to perform a connection and release process as a call for a call. Here, the call access process is performed in the order of 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 also 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 223.

In step 223, 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 received station based on reception strength as in step 203. Inspect internal condition. In step 224, 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 process returns to step 204.

However, if the paging signal does not exist in step 220, the flow proceeds to step 225 to check whether a connection request signal is generated by the terminal operator. As a result of the check, if a connection request signal is generated, the flow returns to step 221 to perform a connection and disconnection process for a call as described above. On the other hand, if the access request control command by the operator is not authorized in step 225, the process proceeds to step 223 to check the state of the terminal as described above. The flow proceeds to step 224 and is driven as described above.

As described above, in the wireless telephone network system, the present invention generates a random number in consideration of the number of free time slots that exist when a plurality of terminals are connected to free time slots in the same fixed station, and uses the generated random numbers. By selecting the time slot to attempt the connection, it is possible to prevent the convergence to one time slot, thereby minimizing the collision that may occur when connecting the time slot, thereby improving the overall system efficiency.

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; A first investigation step of examining available time slots when the mobile station is selected as the nearest station in the standby mode; A first random number generation step of generating a first predetermined random number corresponding to the number of timeslots irradiated in the first irradiation step; A first timeslot selection process of selecting empty timeslots in order corresponding to a first predetermined random number generated in the first random number generation process; An access attempt process of attempting to access the selected timeslot; A registration process for performing registration with the selected adjacent fixed station if the connection is successful by the connection attempt process; A second investigation step of examining the timeslot available in the fixed station again when a collision occurs in the connection attempt process; Generating a second predetermined random number in which the number of timeslots irradiated in the second irradiation process is set as a reference value and the corresponding unique number of the portable terminal is set as an initial value and arranged in the order of (initial value, reference value); 2 random number generation process; Setting a predetermined access attempt delay time for a corresponding timeslot to which connection is attempted by a second predetermined random number generated in the second random number generation process; And when the predetermined connection attempt delay time has elapsed, a process including a process proceeding to the connection attempt process. The method of claim 1, wherein, in the connection attempt delay time setting process, when the initial value of the random number is N, the connection attempt delay time is set to N frame periods.