KR20000009929A - Automatic roaming method for bidirectional codeless call system - Google Patents

Abstract

PURPOSE: An automatic roaming method is provided to enable a cordless call terminal to request a roaming registration and perform a roaming with receiving a message of registration certification. CONSTITUTION: In a bi-directional cordless call system which applies a simulcasting channel, after moving, a cordless call terminal compares(S200) a current frame information with a frame information of previous service area, and discriminates(S220) whether the frame information is changed. If the frame information is changed, the cordless call terminal requests(S240) a roaming registration to the system, and receives(S300) a certification about the registration from the system. Specially, the cordless call terminal confirms the changes of a service provider ID information and an area ID information in a frame information which is always transferred continuously from the system, and determines the roaming converting. Therefore, a subscriber oneself need not request a roaming registration.

Description

How to register roaming automatically when moving service area of two-way wireless calling terminal

The present invention relates to an automatic roaming method in a two-way radio calling system. Particularly in a bidirectional radio calling system combining a simulcasting channel transmission method having a forward direction and an ALOHA transmission method having a reverse direction in which a radio calling terminal transmits a message to the system, the forward data transmission format is included in the forward data transmission format. The wireless calling terminal that receives the means for distinguishing the service provider and the means for distinguishing the area from the mobile station determines the change of these conditions and requests roaming registration in the reverse direction, and the system receives the request and registers the roaming. call system). The simulcasting channel is a channel that transmits the data wirelessly with the same frequency, and transmits the same data between the radio transmitting stations.

Roaming in the two-way radio calling system is performed in a service area of another service provider so that the mobile terminal can continue to receive the service when the location of the user's mobile terminal moves out of the service area of the service provider. It means that the system has been informed or wants to continue to receive the service and is allowed or confirmed by the system.

Representative of the wireless calling system, the Post Office Code Standardization Adversary Group (POCSAG) method and the FLEX ^TM method use only a simulcast channel as the transmission frequency.

As a roaming method of a conventional radio calling system, a roaming process in a POCSAG system is as follows.

The paging terminal first determines that it is not in the service area capable of receiving at the reference frequency, the simulcasting frequency, and automatically finds the frequency of the simulcasting of the newly moved area, or artificially sets the frequency. When switching to the set frequency, the roaming process no longer proceeds from the point of view of the radio call terminal. Therefore, it is assumed that the system of the reference area does not know in which service area the corresponding wireless calling terminal is located, so it is assumed that the service continues to be carried out only in its own service area. Therefore, the wireless calling terminal can no longer receive the service. In order to prevent this, the conventional technology should inform the system of the registration area where the subscriber was artificially registered, that the service area has been directly departed from the wired / or wireless public network, and that the mobile calling terminal has moved to the new service area. This is a roaming registration request process. As the subscriber requests the roaming registration of the radio calling terminal by itself, the system of the registered area where the radio calling terminal is registered is a roaming request to the system of the new setting area where the radio calling terminal has moved. You should be informed.

When the inter-system communication for roaming registration is terminated under the agreement between the systems, the system in the setting area notifies the radio calling terminal as a call that the roaming registration is completed safely.

When a radio call terminal in a roaming area has a radio call in a state where roaming registration is in progress, a system in a registration area where the radio call terminal is originally registered, the roaming setting area in which the radio call terminal wants to continue to receive service. The call is transferred to the system of the caller, and thus, the system of the setting area transmits a call message to the radio caller terminal at the simulcasting frequency.

On the other hand, in the FLEX ^TM method, the wireless calling terminal does not roam on the condition that only the simulcast frequency is changed, but waits until the frequency, operator, country, time zone, and region information is transmitted from the system. I'm making a switch. This is basically the same roaming process as the POCSAG method. However, unlike POCSAG, due to the high speed of employment, the subscriber can designate another region, and the system sends a call message to the region registered by the original subscriber, and if there is no roaming, The message is duplicated. From the point of view of the radio call terminal, even if the user moves to another area, the user can be fooled as if roaming. However, this method has the problem of doubling the channel when the capacity of the subscriber increases significantly, and more importantly, it is not roaming in principle. This is because the channel capacity is greatly lacking when trying to solve all domestic regions in the same way as FLEX ^TM , and simulcasting must occur at different frequencies.

However, the conventional roaming method in the wireless paging system using only the simulcasting channel has been inconvenient to confirm the area where the subscriber has moved the location by wire.

The present invention has been invented to solve the inconvenience of the prior art, an object of the present invention is to transmit data by including in a signal transmitting a service provider identification method and a local location identification method in a two-way wireless calling system If a dual-changing element is found in the data received by the two-way wireless calling terminal receiving the data, the terminal immediately requests a roaming registration by itself and receives a registration confirmation message. An automatic roaming method is provided.

As a technical idea for achieving the above object of the present invention, there is a frame header that has a synchronization signal and follows the synchronization signal, and in a radio calling protocol having a frame unit consisting of a message following the header, in every frame header The data includes a method of identifying a provider providing the wireless data, a method of distinguishing a frequency providing the wireless data, and a method of indicating an area representing a radius where the provider provides wireless data. From these three methods, the wireless calling terminal has means for determining whether the business or region to which it belongs is the same, and the determining means includes a memory, and if it is changed from the determined information, the wireless calling terminal is automatically started from the wireless calling terminal. If you report to the system by signal, The wireless terminal call is presented roaming method of receiving a location registration confirmation signal.

As another technical idea of the present invention, the position registration confirmation signal received from the system in the first technical idea may be audible frequency such as voice or alarm sound, tactile sense such as vibration or temperature difference, or visual method. An automatic roaming method that converts and confirms is presented.

1 is a schematic system diagram of a two-way radio call transmission / reception system.

2 is a view for explaining a two-way wireless call transmission and reception method to which the present invention is applied.

3 is a structural diagram of a transmission data packet to which the present invention is applied.

4 is a structural diagram of frame information to which the present invention is applied.

5 is a flowchart illustrating an automatic roaming method of the present invention.

<Description of the symbols for the main parts of the drawings>

10: host system 11: PSTN

12: transmitting station 13, 14: receiving station

15: terminal 100: first service area

110,210: Channel area 120,220: Terminal

130,230: base station 140,240: system

150: database server 200: the second service area

270: recipient 300: batch

310: frame 311: sync code

312,400: frame information 313: control word

314: message 500: channel encoding

600: parity

Hereinafter, with reference to the accompanying drawings for the configuration and operation of the present invention will be described in detail. Other embodiments may be given without departing from the spirit of the invention.

1 is a schematic system diagram of a two-way radio paging system to which the radio call transmission method of the present invention is applied. A host system 10 for providing a wireless paging service, a public switched telephone network (PSTN) 11 for transmitting a paging message or the like according to the instruction of the host system, and information such as a paging message from the PSTN in each channel region. The PSTN (receiving necessary information signal transmitted from a transmitting station 12 carrying a transmission channel frequency on a transmission channel frequency, a radio calling terminal 15 owned by a user, and a radio calling terminal such as a user) is received. 11) and a receiving station 14 for transmitting to.

In the bidirectional wireless calling system having the above-described system, when a general call message or the like is transmitted from the transmitting station 12 to the service channel area, the user can receive call information from the wireless calling terminal 15 and take call information from the user. Will be. This action corresponds to the service of a general radio calling system.

In the operation of the two-way radio calling system, the transmission operation from the transmitting station 12 to the radio calling terminal 15 is referred to as an outbound or foward system, and the location registration procedure from the radio calling terminal 15 is performed. In order to perform the transmission operation to the receiving station 14, etc., it is called an inbound or reverse system.

4 is a structural diagram of a data packet represented by the above simulcasting channel information. All the above frames start from the sync code SC as shown in Fig. 4, and the sync codes of all the frames are the same. The sync code is composed of a preamble and a unique code. Each frame includes frame information FI that all the wireless calling terminals should receive, and the frame information includes information about the batch.

5 is a structural diagram of frame information FI applied to a transmission method of the present invention.

The radio call terminal 15 applied to the present invention can receive and decode the frame information FI upon receiving the sync code SC of each frame to obtain word sync. One word obtained in the above frame has a length of 32 bits, and has a structure of 21 bits of information content and 11 bits of parity among 32 bits. The parity is 10 bits of the channel encoding BCHs 31 and 21 and 1 bit of even parity, and the basic structure of the word is the same as that of the POCSAG structure.

Hereinafter, the definition of the name of each field of the frame information FI will be described.

Table 1 shows the definition of the terms of each field of the frame information.

field Contents NID Country identifier SPID Service provider identifier FrqID Frequency identifier AID Local identifier

Hereinafter, the subsections 1th, 2th, 3th,... Corresponding to each word of the frame information FI will be defined and their use will be described in detail.

A) NID: Country Identifier

NID (Nation IDentity) is introduced to distinguish messages sent in overlapping areas between countries. The cross country identification code may use, for example, the value defined in the CFITT (IUT-T) Standard E.212 Annex A.

B) SPID: service provider identifier

SPID (Service Provider ID) is an identifier for the UE to distinguish the service provider of the simulcasting channel received by the UE. SPID is a parameter referenced by the auto roaming function.

C) FrqID: frequency identifier

FrqID represents an identifier of a carrier frequency currently being transmitted. The frequency identifier is set by the reference frequency, and the reference frequency is defined as any one of average frequencies among frequencies allocated to two-way radio calling service providers in a country, and is determined by consultation between service providers.

D) AID: Service Area Identifier

The value of AID (Area ID) is an identifier that distinguishes the service area supported for automatic / manual roaming. It should be uniquely defined in a country and can be determined by agreement between service providers.

The service area is identified by the wireless calling terminal using the simulcasting call channel, and the movement of the area is identified using the simulcasting call frequency, the service area identifier, and the service provider identifier. For this purpose, the radio calling terminal should record information on the frequency for service area identification in the storage at the time of production, and sometimes it can be changed as radio calling information.

2 is a conceptual diagram illustrating an automatic roaming method in a two-way wireless paging system according to the present invention.

Service areas (100, 200) generally divided into service area areas,

A plurality of channel regions 110 and 210 having a predetermined radius including regions overlapping each other in the service areas 100 and 200, and a base station 13 positioned in the one channel region 110 or 210; 230, receiving station 270 and terminals 120, 220,

The system 140, 240 and the subscriber DB mailbox 150 are installed in each of the service areas (100, 200).

In each of the channel regions 110 and 210, there is a simulcasting channel in common, and there are local paging channels f1, f2, f3, ..., which vary in amount depending on the size of the channel region.

6 is a flowchart illustrating an automatic roaming method of the present invention.

In the two-way radio calling system, the terminal has channel scanning means for finding an optimal channel in the terminal, continuously receives simulcasting information from the system, and has a means for comparing the field strength of the simulcasting frequency, for each roaming service area. A roaming switching method of a radio calling terminal, which records information on simulcasting frequencies in a storage device inside a radio calling terminal,

If the electric field strength of the simulcasting frequency is lower than a certain level and lasts for a predetermined time, preparing a frequency list of roaming service areas recorded in the internal storage device as a pre-regional movement step (S100);

An internal PLL device for moving the reception frequency to a frequency serving the roaming service area of step S100 in the simulcasting channel scanning process performed by the radio calling terminal to select an optimal simulcasting frequency channel. Driving step (S120),

For the channels where the electric field strength of the frequency is higher than a certain level in the process of scanning the simulcasting channel, all the simulcasting frequencies recorded in the memory device are searched and the electric field is selected to select the optimal simulcasting frequency channel. Recording the intensity intensity (S140),

The PLL is driven again by reselecting the simulcasting frequency in descending order of the recorded field strength strength, and performing synchronization acquisition to synchronize at the simulcasting frequency to obtain frame information FI included in the transmission data. Read frame read step (S160),

A frame analysis determining step (S180) of determining whether the frame information read in the frame reading step 160 is interpretable;

In step S180, if the frame information cannot be read and compared from all the simulcasting frequencies, the roaming registration request process is terminated and the frame information of the read simulcasting frequencies is compared (S200);

The roaming registration request process is not terminated in the comparison step (S200) so that frame information can be compared so that the information read in the frame information read step (S160) determines whether the roaming information has been changed from the original frame information. Information change determination (S220) process,

When it is determined in the frame roaming information change determination step (S220) that it has not been changed, the roaming registration request process is terminated, and when it is determined that the radio calling terminal performs the roaming registration request (S240) and ,

A system roaming registration step (S260) of performing communication between a roaming local system receiving the roaming information transmitted in the roaming registration request step (S240) and a system of an operator registered by the radio calling terminal;

Roaming registration is completed by the system roaming registration step (S260) to transmit a roaming completion confirmation call signal to the radio calling terminal in a roaming local system (S280),

Receiving a roaming complete confirmation call signal transmitted in the step (S280) is made in the step (S300).

The roaming information change determination step (S220) is performed by determining information of the service provider identifier (SPID), the frequency identifier (FqrID), and the region identifier (AID) in the frame information (FI) read in the frame information reading step (S160). The process of determining whether or not to change. If the mobile calling terminal moves out of the service area of the service provider, the service provider identifier (SPID) is changed, and if the mobile calling terminal moves within the service area of the same service provider, the channel area is changed, so the frequency identifier (FqrID) is determined. If the service provider is the same and the frequency identifier (FqrID) is the same, the change of the service area identifier (AID) is determined to determine whether to roam. Here, since the service provider identifier (SPID) and the area identifier (AID) are continuously transmitted from the system, the radio calling terminal can always check the change.

The roaming registration request step (S240) is a process for continuously receiving a service even after the identifier is changed by informing the system of its current location when the identifier of the frame information is changed.

In the roaming registration confirmation transmission step (S280) and the roaming registration confirmation reception step (S300), the system roaming step (S260) receives a location registration in the corresponding system determined by roaming between systems in the system roaming step (S260), the radio call terminal And the radio call terminal receives the transmission signal and displays it on the terminal. Here, the display means of the wireless call terminal that has received the location registration confirmation information includes a message displayed on the terminal as a text or a symbol and a means for displaying by voice.

The automatic roaming method of the present invention will be described with reference to the conceptual diagram of FIG. 2 and the flowchart of FIG. 6. First, the identification procedure of the service areas 100 and 200 is similar to the procedure described in the one-way radio call, and the detailed description of the operation is as follows.

a) When the subscriber moves from the reference area to the setting area, the wireless paging terminal possessed by the subscriber lasts for a predetermined time because the electric field strength of the existing reference frequency is lower than a certain level or the bit error rate (BER) increases. If so, prepare a frequency list of roaming service areas recorded in the internal memory as a pre-regional movement.

b) The radio call terminal drives a phase loop lock (PLL) circuit device inside the terminal at a service area frequency to sequentially change a frequency to be received and to search for and record a received electric field strength.

c) For frequencies exhibiting field strengths above a certain value, the paging terminal may measure the BER by receiving messages in earnest in the frequency order of the strongest field strength.

d) Receiving a message in earnest at a receivable frequency and first determining whether the frequency information is correct, and if the frequency information is correct, obtaining information about a service area and information for distinguishing a service provider and performing a roaming registration request step. .

e) If the frequency information is wrong in the above step, the internal PLL may be reset to a frequency indicating the received frequency information and may proceed until the roaming registration request step.

f) continue by resetting the PLL to the adjacent frequency when the moving area is not detected in step e) or when the field strength is below the reference level or when the BER that can be additionally set is higher than the reference level. You can also proceed.

Service area identification is proceeded, roaming registration process is as follows.

g) a roaming registration request step, comprising: a message informing that the radio calling terminal is a roaming registration request at least in the reverse direction, an address unique to the radio calling terminal, information indicating a service provider of a registered area in which the radio calling terminal is registered; The PLL transmits information on the frequency set by the PLL and information on the service area received by the roaming registration request signal.

h) In the roaming registration request step, the radio calling terminal may further include transmitting information indicating a service provider of a mobile area in a reverse direction.

i) When the wireless calling system of the setting area receives the roaming registration request signal requested by the wireless calling terminal, the roaming location registration request signal and the setting area of the registered calling region of the registered region to which the wireless calling terminal belongs are analyzed. It also transmits a signal identifying the radio calling system.

j) The registered radio calling system analyzes the roaming location registration request signal, stores it in at least an integrated subscriber database management system, and updates the roaming location information by finding the registered mailbox of the radio calling terminal.

k) When at least the update is completed, the radio calling system of the setting area transmits a signal indicating that roaming registration is completed safely.

l) When the wireless calling system of the set area receives a signal indicating that the roaming registration is finished, the roaming registration confirmation completion call is made at the simulcasting frequency requested by the wireless calling terminal in step g). do.

m) adding a method of acknowledging the confirmation signal to an audible frequency, tactile recognition, or visual recognition so that the wireless calling terminal receives the confirmation completion call and informs the user of the result. It may be.

n) If the confirmation completion call is not received within a certain time, the automatic roaming may be regarded as a failure, and the roaming registration request may be automatically added or a roaming registration request may be manually added.

o) The procedure of the manual roaming registration request method is the same as that of the automatic roaming registration request method, except that artificial selection is included in the method of setting the frequency.

As described above, in the present invention, in the two-way radio calling system to which the simulcasting channel is applied, the mobile calling terminal having moved the position compares the current frame information with the frame information before moving the service area to determine whether the change is made. And, if changed, make a roaming registration request to the system and receive a confirmation of registration from the system, in particular, confirming the change of the service provider identifier (SPID) information and the area identifier (AID) information which is always transmitted continuously from the system among the frame information. By determining whether to switch roaming has the effect of eliminating the inconvenience that the subscriber makes a roaming registration request.

Claims (9)

In the two-way radio calling system, the terminal has channel scanning means for finding an optimal channel in the terminal, continuously receives simulcasting information from the system, and has a means for comparing the field strength of the simulcasting frequency, for each roaming service area. A roaming switching method of a radio calling terminal, which records information on simulcasting frequencies in a storage device inside a radio calling terminal, If the electric field strength of the simulcasting frequency is lower than a certain level and lasts for a predetermined time, preparing a frequency list of roaming service areas recorded in the internal storage device as a pre-regional movement step (S100); An internal PLL device for moving the reception frequency to a frequency serving the roaming service area of step S100 in the simulcasting channel scanning process performed by the radio calling terminal to select an optimal simulcasting frequency channel. Driving step (S120), For the channels where the electric field strength of the frequency is higher than a certain level in the process of scanning the simulcasting channel, all the simulcasting frequencies recorded in the memory device are searched and the electric field is selected to select the optimal simulcasting frequency channel. Recording the intensity intensity (S140), The PLL is driven again by reselecting the simulcasting frequency in descending order of the recorded field strength strength, and performing synchronization acquisition to synchronize at the simulcasting frequency to obtain frame information FI included in the transmission data. Read frame read step (S160), A frame analysis determining step (S180) of determining whether the frame information read in the frame reading step 160 is interpretable; In step S180, if the frame information cannot be read and compared from all the simulcasting frequencies, the roaming registration request process is terminated and the frame information of the read simulcasting frequencies is compared (S200); The roaming registration request process is not terminated in the comparison step (S200) so that frame information can be compared so that the information read in the frame information read step (S160) determines whether the roaming information has been changed from the original frame information. Information change determination step (S220), When it is determined in the frame roaming information change determination step (S220) that it has not been changed, the roaming registration request process is terminated, and when it is determined that the radio calling terminal performs the roaming registration request (S240) and , A system roaming registration step (S260) of performing communication between a roaming local system receiving the roaming information transmitted in the roaming registration request step (S240) and a system of an operator registered by the radio calling terminal; Roaming registration is completed by the system roaming registration step (S260) to transmit a roaming completion confirmation call signal to the radio calling terminal in a roaming local system (S280), Receiving a roaming completion confirmation call signal transmitted in the step (S280) at the terminal (S300) Automatic roaming method of a two-way radio calling system comprising a. The method of claim 1, wherein the frame roaming information change determination process (S220) comprises at least means for indicating a service provider included in the frame information (FI), means for identifying the frequency, and service area. Automatic roaming method of a two-way radio call system, characterized in that the process of determining whether the change, including the means for identifying. The apparatus of claim 1, wherein the radio calling terminal further selects the channel in consideration of the BER from the received data of the simulcasting frequency by channel scanning means for identifying the simulcasting frequency to select an optimal simulcasting frequency. Automatic roaming method of a two-way radio calling system comprising a. The method according to claim 1, wherein the roaming registration request step (S240) is characterized in that the radio calling terminal at least information indicating a roaming registration request, information that can indicate that the radio calling terminal, and the registration area registered with the radio calling terminal; The roaming method of the two-way radio paging system characterized in that the request to the reverse direction by including the information indicating the system in the roaming registration request signal. The method of claim 4, wherein the roaming registration request step (S240) further includes information about a simulcasting frequency of the roaming region set by the radio calling terminal in a signal to be transmitted. Roaming method. The system according to claim 1, wherein the system roaming step (S260) analyzes the location registration request signal transmitted from the roaming system in a wireless calling system in which a wireless calling terminal is registered, and stores the location registration request signal at least in an integrated subscriber database management system. A method for automatic roaming in a two-way radio calling system, wherein the terminal updates a roaming location information by finding a registered mailbox. The system of claim 1, wherein the roaming registration confirmation receiving step (S300) has a means for generating a signal by converting the roaming registration completion confirmation information received at the radio call terminal into a notification signal of an audible frequency. Roaming method. The method of claim 1, wherein the roaming registration confirmation receiving step (S300) has a means for generating a signal by converting the roaming registration completion confirmation information received from the radio call terminal into a visual notification signal; Automatic roaming method. The method of claim 1, wherein the roaming registration confirmation receiving step (S300) has a means for generating a signal by converting the roaming registration completion confirmation information received from the radio call terminal into a tactile notification signal; Automatic roaming method.