KR0164090B1 - Method of paging service - Google Patents

Abstract

The present invention relates to a paging service providing method for providing a simple text delivery service in a code division multiple access mobile communication system (hereinafter referred to as a CMS). A first step of performing location registration for SCI change with (MSC / VLR); A second step of checking, by the calling party (PSTN / SME or MS), an incoming call, the mobile switching center (MSC) checks the power ON and the slot cycle index (SCI) of the incoming mobile terminal (MS); A third step of informing the caller that only the paging service is available when the incoming mobile terminal MS is powered on but the SCI is above the reference value; A fourth step of transmitting and receiving paging service information between a mobile switching center (MSC) and a caller when the caller selects a paging service; And a fifth step of performing slot paging by sending a message received by the MSC to the MS, thereby reducing the power consumption of the UE and reducing the frequency of location registration in the power state change. It is effective.

Description

How to provide paging service

1 is a block diagram of a mobile communication system to which the present invention is applied.

2 is a slot structure diagram of a paging channel.

3 is a structural diagram of a paging channel according to the present invention.

4 is a flowchart illustrating a paging service providing process according to the present invention.

* Explanation of symbols for the main parts of the drawings

MS: Mobile terminal BTS, BSC: Base station

MSC: Mobile Telephone Exchange Office LR: Location Register

The present invention relates to a mobile terminal and a mobile terminal in a power-on state of a mobile terminal accommodated in a code division multiple access type mobile communication system (hereinafter referred to as CMS). The present invention relates to a paging service providing method for providing a simple text transfer service between a message service providing apparatus (hereinafter, referred to as SME).

Looking at the existing service providing method, the Short Message Service (hereinafter referred to as SMS) is already in service in the European system of Global System for Mobile communications (GSM), and North American Code Division Multiple Access (CDMA) method is shortened. Standardization is underway in IS-637, a message service (SMS) standard.

And, in the IS-637, the SMS is composed of CPT (Cellular Paging Teleservice) and CMT (Cellular Messaging Teleservice), the CPT is a service that can transmit up to 63 characters, the terminating mobile terminal can store or display it on the screen Supported character types are letters (AZ), digits (0-9, *, #), symbols (space,!, $, =), Control characters (STX (Start of text), ETX (End of text) The CMT is a service capable of transmitting up to 255 characters including control attribute information. The CMT can store or display it on the screen. This may not be possible, so a function must be provided for this.

Supported character types include letters (AZ), digits (0-9, *, #), symbols (space,!, $, =), Control characters (end-of-line, carriage return, backspace, tab). .

In addition, the SMS in the GMS is the end-to-end SMS, the mobile terminal outgoing SMS and the mobile terminal incoming SMS, the broadcast service is a cell broadcast SMS, 160 ASCII (ASCII) text can be delivered to the mobile terminal during communication. .

And, end-to-end SMS can be seen as a paging service in the response (Ack), a short message that informs that the voice mail box, etc. is a typical SMS, the cell broadcast SMS is a road information to the mobile terminal is not busy, etc. Can be used to indicate.

However, in order to provide the above SMS, a separate SMS message center has to be developed, and there has been a problem in that the mobile terminal must be continuously turned on in order to receive the service.

Disclosure of Invention The present invention has been made to solve the above problems, and an object thereof is to provide a paging service providing method which reduces power consumption of a mobile terminal and prevents an unwanted incoming call when providing a paging service in a CMS.

In order to achieve the above object, the present invention provides a mobile terminal (MS) called a mobile telephone, a mobile telephone, a base station (BS) for transmitting and receiving a signal to and from the mobile terminal (MS), and the base station (BS) and Connected to handle calls between mobile terminals (MS) and connected to Public Switched Telephone Network (PSTN) / Public Data Network (PDN) to handle calls between MS and wired terminal In the method of providing a paging service applied to a mobile communication system composed of a mobile switching center (MSC), the MS changes a parameter to change the SCI to the MSC / VLR in advance. In the first step of performing location registration by a mobile station, when a caller (PSTN / SME or MS) requests an incoming call to a mobile switching center (MSC) of a CMS (CDMA Mobile Systems), the mobile switching center (MSC) receives an incoming mobile terminal ( MS) is on (2) Investigate whether (Power ON) or SCI (Slot Cycle Index) is higher than the standard value (normal call processing is not possible) .Investigation result, if the incoming mobile terminal (MS) is powered on but SCI is higher than the standard value, Step 3 (MSC) notifies the caller (PSTN / SME or MS) that normal call processing is not possible and the paging service is available.The caller (PSTN / SME or MS) selects the paging service using a separate identification number. The fourth step of transmitting and receiving the paging service information between the MSC and the caller (PSTN / SME or MS), and performs the slot paging by sending a message received by the MSC to the mobile station (MS) It characterized in that it comprises a fifth step.

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

1 is a block diagram of a mobile communication system to which the present invention is applied, and includes a mobile terminal (MS) called a mobile phone and a mobile phone, and a base station (BTS) for transmitting and receiving signals to and from the mobile terminal (MS). Transceiver Subsystem (BSC) and Base Station Controller (BSC) are connected to the base station to handle calls between mobile terminals and connected to Public Switched Telephone Network (PSTN) / Public Data Network (PDN). And a Mobile Switching Center (MSC) that handles calls between wired and general wired terminals, and the Visitor Location Register (VLR) is the location of the mobile terminal in the jurisdiction of the MSC. The home location register (HLR) stores unique data of mobile terminals subscribed to its mobile telephone exchange.

First of all, the mobile terminal has only a new paging service except power on, incoming call processing enabled, power off, and incoming call processing disabled, and a slot cycle index (SCI). Sets a large state (a call signal is possible).

Now, let's look at the paging channel monitoring general, where the paging channel is divided into 80ms slots called paging channel slots, and the mobile terminal that monitors the paging channel only for certain slots can be said to operate in slot mode. During unused slots, processing in the mobile station is stopped or reduced to reduce power consumption. In addition, the slot mode operates only when the mobile terminal is in the idle state.

The mobile terminal operating in the slot mode generally monitors a paging channel for one or two slots per slot cycle, and registers a message (using a registration method according to a parameter change among 9 registration methods in the TIA / EIA IS-95). The slot cycle index (SLOT_CYCLE_INDEX) field in the call message and paging response messages can be used to determine the desired slot cycle.

The slot cycle time T is at least 1.28 seconds long and is 16T slots per cycle. This is expressed as follows.

Where i is the selected SCI (Slot Cycle Index) and the slot monitoring period according to the SCI is shown in [Table 1].

The slot number SLOT_NUM is a remainder obtained by dividing the slot number of the paging channel by the maximum length slot cycle (2048 slots) (Modulo operation), and has a value from 0 to 2047.

That is, the value of the slot number is expressed as follows.

Here, t refers to the system time in the frames defined in IS-95. In more detail, t is UTC time based on January 6, 1980, 0 o'clock. The minimum unit is 20ms and can be obtained by t = [s / 0.02]. And s refers to the system time in seconds.

Therefore, the start of its slot cycle in each mobile terminal occurs by moving its slot offset PGSLOT at the point where the slot number becomes '0'.

The paging channel slot monitoring method defined in IS-95 is as follows.

For each assigned slot, the mobile station begins to monitor the paging channel exactly so that the first bit of the assigned slot is received. The mobile station monitors the assigned slot and the next slot (if there is a next slot watch indication in the assigned slot) and continues to monitor the paging channel until the state of receiving at least one valid message is satisfied.

To determine the assigned slot, the mobile terminal selects a slot number in the range of 0 to 2047 (163.84 seconds) using the IS-95's hash function. After that, the next slot is selected and monitored in units of 16 × T. Therefore, the slot monitored by the mobile terminal becomes a slot satisfying the following equation.

Here, t refers to the system time of the frames, and T refers to the slot cycle length of 1.28 seconds.

2 is a diagram illustrating a slot structure of a paging channel, in which the paging slot is set to 3 and the SCI is set to 0 in the mobile terminal.

As shown in the figure, before monitoring the slot assigned to the mobile station, the mobile station is in the non-active state and enters the state A of acquiring the code division multiple access (CDMA) system resynchronization. Motivation must be made before. When it finishes monitoring its slot, it returns to inactive state.

If the slot assigned to the mobile terminal is defined as an assigned slot (AssignedSlot (i, PGSLOT)), for example, the slot is allocated as shown in Table 2 below.

The mobile terminal only needs to monitor the slot number assigned to the mobile terminal, which can significantly reduce the power consumption of the mobile terminal.

On the other hand, if the response to the incoming call is more than a predetermined time (about 15 seconds), the caller is likely to hang up.

Therefore, in order to make an incoming call service, call setup must be made within a certain time.

Therefore, the threshold value (T_SCI) of the SCI for paging service provision can be set to an SCI satisfying the following equation.

If the SCI is 3, the paging monitoring period is up to 10 seconds (1.28 × 2 ³ ) .The response time of the incoming mobile terminal to paging (up to 3 seconds) and the processing delay at the exchange and the LR (location register) (2) SCI, etc.) will be approximately 15 seconds, so it is reasonable to set the threshold value of SCI, which is a paging service provision standard, to 3.

Therefore, the paging service according to the present invention can be used for the case where the mobile terminal sets the SCI to 3 or more and registers it in the LR using the location registration method.

3 is a structural diagram of a paging channel according to the present invention, wherein 80 ms paging channel slots (8 paging channel half frames) are composed of a plurality of paging channel 1/2 frames, the one paging channel 1/2 frame (10 ms) It consists of a 1-bit Synchronized Capsule Indicator (SCI) and a paging channel 1/2 frame body of (0.01 * (R-1)) information bits.

The paging channel message capsule includes a paging channel message, additional bits, an 8-bit message length (MSG_LENGTH) field, a message body of 2 to 1146 bits, and an error detection (CRC) field of 30 bits.

Therefore, when the paging channel data transmission rate is 4800bps, the message body transmission capacity of the 80ms paging channel slot is maximum 43 bytes / Message body, and when the paging channel data transmission rate is 9600bps, the message of the 80ms paging channel slot Maximum transmission capacity is 91bytes / Message body.

Therefore, only paging messages of up to 91 bytes can be transmitted to the mobile station. This value is large enough for a PSTN subscriber to page a mobile terminal.

4 is a flowchart illustrating a paging service providing process according to the present invention, and uses the existing structure as shown in FIG. 1 as it is without developing a separate device for a paging service in a CMA system.

As shown in the figure, the mobile station MS performs location registration by changing parameters to change the SCI to the mobile switching center MSC / VLR in advance (401), and the caller (PSTN / SME or MS) receives the CMS. The incoming call is requested to the MSC (402).

Upon receipt of this, the MSC examines the incoming subscriber data with the help of the location register LR to determine whether the MS is powered on. Check if it is impossible). As a result, when the power is turned on and the SCI is below the reference value, an incoming call is requested by paging to the mobile terminal (MS) in the same manner as the existing normal call processing (403).

If the slot paging state, that is, the power is on but the SCI is above the threshold, the MSC notifies the caller (PSTN / SME or MS) that normal call processing is not possible and the paging service is enabled (paging). The service selection grant announcement 404 and the caller (PSTN / SME or MS) inform the mobile switching center (MSC) whether or not to select a paging service using a separate identification number (e.g., hook on) (405).

In this case, when the paging service is selected, the paging service information is transmitted and received between the MSC and the caller (PSTN / SME or MS) (406). That is, a caller (PSTN / SME or MS) sends a short message (calling number, etc.) to a mobile switching center (MSC) using a dual tone multiple frequency (DTMF) tone, and the mobile switching center (MSC) uses a DTMF receiver. To receive.

The MSC loads the received message into a data burst message and sends it to the MS (slot paging) (407). At this time, the incoming mobile terminal (MS) in slot paging state monitors only the slot of the paging channel corresponding to its own by prolonging its paging channel monitoring period, and if there is information on the monitoring result and the short message, it is used by the mobile terminal (MS) user. Inform to sound or vibration.

If the mobile terminal MS is powered off (Power OFF), the paging service is terminated (408).

Looking at the features of the paging service providing method according to the present invention to be processed as described above, the call processing additionally, that is, prioritized the incoming and outgoing signal processing, and if not possible to provide a paging service, can be implemented in the existing single number system For this purpose, an APRS (Audio Prompt Response System) is required for announcement.

In addition, the mobile terminal operates in slot paging mode (1.28 to 163.84 seconds can be set) to reduce power consumption in the idle state when the power is on but not in a busy state. In order to reduce the slot paging mode setting interval time (e.g. more than 10 seconds), the caller will not be able to talk to the caller who wants to make a call (if the call is requested, the caller will give up the call if the paging response time is delayed). Will be).

In this case, if there is a call request to the incoming mobile terminal, the exchange identifies that the incoming mobile terminal is turned on but the slot paging mode period is set so long that it cannot be received, and normal call processing is not possible to the caller using its own announcement service. The paging service is available.

At this time, the sender sends the information (mostly numeric information) to send to the exchange by using DTMF (Dual Tone Multiple Frequency) tone, and the exchange receives it using its own DRMFR (DTMF Receiver) and then sends a data burst message (Data). Send information to Burst Message).

The base station receives this information in a paging slot monitored by the mobile station, and when the mobile station receives a data burst message containing a short message while monitoring the paging slot to be monitored by the mobile station, it displays the screen of the mobile terminal. (Liquid Crystal Display) indicates that paging is coming and notifies the incoming mobile terminal by sound or vibration.

Looking at the advantages according to the present invention according to the network operator and the mobile terminal user is as follows [Table 3].

According to the above, the present invention enables a simple message transmission and reception without developing a separate SMS (shortened message service) message center, and the incoming mobile terminal may be turned on for a longer time than the conventional method, thereby receiving an incoming call to itself. You can receive more, and you can reduce the wasted power of the mobile terminal due to unwanted calls, because you only need to call again for the desired incoming call.

In addition, since it is not necessary to turn off the power to reduce power consumption of the mobile terminal, the network operator can reduce the load according to the power up and down status according to the mobile terminal power state. If the probability of turning off the power is reduced, SMS message storage and forwarding functions through the development of a separate SMS message management center are needed less.

Claims (5)

A mobile terminal called a vehicle telephone or a mobile phone, a base station that transmits and receives signals to and from a mobile terminal, is connected to a base station to handle calls between the mobile terminals, and is connected to a public switched telephone network / general data network to make a call between a mobile terminal and a wired terminal A method of providing a paging service applied to a mobile communication system comprising a mobile switching center, the method comprising: a first step of a mobile terminal performing location registration by changing a parameter for changing an SCI to a mobile switching center in advance; When the caller requests the incoming call to the mobile switching center of the CMS, a second step of investigating whether the mobile switching center incoming mobile terminal is powered on or whether general call processing is impossible because the SCI is above a reference value; A third step of informing the caller that normal call processing is not possible and the paging service is available if the incoming mobile terminal is powered on but the SCI is above the reference value; A fourth step of transmitting and receiving paging service information between the mobile switching center and the caller when the caller selects a paging service using a separate identification number; And a fifth step of performing slot paging by sending a message received by the mobile switching center to a mobile terminal. The method of claim 1, wherein after performing the second step, if the power is on and the SCI is less than the reference value, the sixth step of requesting an incoming call by paging to a mobile terminal as in the normal normal call processing, and ending the paging service if the power is turned off. Paging service providing method characterized in that it further comprises. 3. The method of claim 1 or 2, wherein the fourth step comprises: a seventh step of the caller sending a short message to the mobile switching center using DTMF tones; And an eighth step of the mobile switching center receiving a short message using a DTMF receiver. The method of claim 1 or 2, wherein the step (5) comprises: a seventh step of sending a message received by the mobile switching center to a mobile terminal in a data burst message; An eighth step of the incoming mobile terminal in the slotted paging state extending its paging channel monitoring period to monitor only slots of the paging channel corresponding to the slotted paging channel; And a ninth step of informing the mobile terminal user of the information as a result of the monitoring as a result of sound or vibration if there is information on the shortened message. The method of claim 4, wherein the structure of the paging channel comprises a plurality of paging channel 1/2 frames.