KR20020040439A - Method of Extending Sleep Time of Cellular Phone in the Mobile Communication Network and Paging Channel Structure for the Method - Google Patents

Abstract

PURPOSE: A method for extending a mobile station stand-by time in a mobile communication network and a paging channel structure is provided to increase the stand-by time by maintaining the compatibility between a present base station and a mobile station, and by reducing power consumption. CONSTITUTION: An RF unit(110) is connected to an antenna(100). In addition, the RF unit(110) transmits and receives signals. A signal duplication unit generates the first and the second signal respectively corresponded to the signals received to the RF unit(110). The first modem(130) performs a system synchronization and a slot synchronization through the first signal and receives a call channel through the first signal. The second modem(140) receives synchronization related information from the first modem(130). In addition, the second modem(140) detects information on the necessity for confirming whether a relevant terminal is called through the second signal. A call processing unit(150) receives call confirmation unwanted information from the second modem(140).

Description

Method of Extending Sleep Time of Cellular Phone in the Mobile Communication Network and Paging Channel Structure for the Method

The present invention relates to a method of transmitting / receiving increasing a standby time of a mobile station without changing the existing mobile communication network, and more particularly, to a terminal capable of using the method.

In the existing IS-95 A / B type mobile communication network, the standby time of the mobile station is increased through slot mode type call channel transmission / reception. 1 illustrates a slot mode transmission and reception method in a conventional mobile communication network. In the IMT-2000 system, the page indicator channel is used to reduce power consumption and increase standby time. In IS-2000, it is called Quick Paging Channel. The quick call channel is used by the base station to inform whether terminals in the base station area receive the next call channel (or forward common control channel).

The terminal receives a paging indicator or configuration change indicator of the quick paging channel and then uses this information to determine whether to receive the next paging channel (or forward common control channel). do.

However, in order to apply the page indicator method of IMT-2000 to the existing IS-95 A / B type mobile communication network, the base station and the terminal need to be largely replaced. This is necessary.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a method for extending the waiting time of a mobile station and to provide a terminal that can be implemented in an existing modem and hardware device in applying the method.

Another technical problem to be solved by the present invention is to provide a call channel transmission method for extending the waiting time of a mobile station.

1 illustrates an embodiment of a terminal configuration capable of extending a mobile station waiting time according to the present invention.

2 illustrates one embodiment of a mobile station wait time extension method in accordance with the present invention.

3 illustrates an embodiment of a method for stopping call channel reception through call indication channel reception according to the present invention.

4 illustrates an example of a transmission and reception method of a call channel in a conventional mobile communication network.

5 illustrates an embodiment of a slot structure of a call channel and a structure of a call indication channel according to the present invention.

The mobile communication terminal for transmitting and receiving information with the mobile communication base station according to the present invention for solving the technical problem is connected to the antenna responsible for transmitting and receiving signals; A signal replication unit for generating a first signal and a second signal substantially the same as the signal received by the RF unit; A first modem configured to achieve system synchronization and slot synchronization through the first signal and to perform call channel reception through the first signal; Receiving synchronization-related information from the first modem to match slot synchronization, and detects information on the necessity of confirming the call to the terminal through the second signal, and if there is no necessity, call confirmation unnecessary information is notified. A second modem sent to the call processor; And a call processing unit which receives the call confirmation unnecessary information from the second modem, stops receiving a call channel in the first modem, and transitions the terminal to a sleep state.

According to an aspect of the present invention, there is provided a method for receiving a call channel by a mobile communication terminal, comprising: (a) generating a signal received from a base station, the first signal and the second signal being substantially the same as the signal; (b) slot synchronization by the first signal; (c) detecting information on the necessity of confirming whether a call is made to the terminal through the second signal when waking up according to the slot synchronization; And (d) stopping reception of the call channel through the first signal and transitioning the terminal to a sleep state if there is no need, and continuing to perform the call channel through the first signal if there is a need. It features.

In this case, step (b) may achieve slot synchronization through the first signal, thereby matching slot synchronization for demodulation of the second signal.

According to an aspect of the present invention, a call channel structure transmitted by a mobile communication base station includes: a first call channel including an overhead message transmitted to all mobile stations in a base station service area and information on a specific mobile station; And a second call channel having a predetermined time offset with the first call channel in a slot configuration method and including information on whether a first call channel needs to be received. .

In this case, the second call channel may be the same as the first call channel in a frame configuration and spreading scheme, and the time offset is prepared to wake up for the first call channel. It may be characterized by a predetermined time. This call channel structure can also be applied to CDMA communication base stations.

The computer-readable recording medium for a method for receiving a call channel by a mobile communication terminal according to the present invention for solving the technical problem is (a) a first signal, each signal substantially equal to the signal received from the base station; And generating a second signal; (b) slot synchronization by the first signal; (c) detecting information on the necessity of confirming whether a call is made to the terminal through the second signal when waking up according to the slot synchronization; And (d) stopping reception of the call channel through the first signal and transitioning the terminal to a sleep state if there is no need, and continuing to receive the call channel via the first signal if necessary. Record a program to run on the computer.

First, the channel in the mobile communication will be briefly described.

The channel in the mobile communication is a radio channel, and as a result, the communication between the base station and the mobile station is the basis in the mobile communication. The communication between the base station and the mobile station, i.e., voice or information signal, is transmitted in several steps. In the current CDMA system, a pilot channel sync channel, an access channel, and a paging channel are used for processing thereof. And a traffic channel, and define a forward channel from the base station to the mobile station and a reverse channel from the mobile station to the base station.

The pilot channel is always transmitted by the base station on the forward CDMA channel. The pilot channel is an unmodulated spread spectrum signal, which is used by mobile stations operating within the area of one base station to achieve initial system synchronization and to track the phase of the base station signal. The mobile stations continuously track the pilot signal, and the size of the cell area varies according to the level of the transmitted pilot signal.

The pilot signal is generated and transmitted for each base station, and each base station uses the same code, but uses a code phase offset treated to distinguish each other so that the mobile station can find system synchronization by searching all code phases only once. . The code phase of the strongest signal is the code phase of the nearest base station. The pilot channel is represented by an offset index from 0 to 511, which means a value offset from a zero-offset pilot PN sequence having an offset of zero.

All forward channels, including pilot channels, are multiplied by the Walsh function before being transmitted, providing orthogonality between all channels on the forward CDMA channel to distinguish them. One Walsh function consists of 64 PN chips at a fixed rate of 1.2288 Mcps. In addition, there are 64 types of Walsh functions. A channel using Walsh function n is given a channel number n, and n has a value from 0 to 63. The Walsh function cycle is 52.083. μs (= 64 / 1.2288 Mcps) and the pilot channel are assigned Walsh function number 0, and the transmission information of Walsh function number 0 is 0.

In the sync channel, channel coding and interleaving are performed on the information signal to be transmitted, and after spreading the information, the modulated signal is transmitted. Using this channel, mobile stations moving within a base station can obtain initial time synchronization. This channel uses the same PN sequence and phase offset as the pilot channel, with a data rate of 1200bps and one sync channel frame. It has a time width of ms. If the mobile station has synchronized the pilot PN sequence by receiving the pilot channel, the synchronization for the sync channel is almost instantaneous.

Three sync channel frames combine to form a single sync channel superframe with a width of 80ms, and messages sent on the sync channel are sent at the beginning of the sync channel superframe. When the zero offset pilot PN sequence is used, the sync channel superframe transmits the sync channel superframe by adding an offset time to an even second time of the base station reference time.

The signal of the synchronization channel includes information about the base station itself, information about the base station itself, and information about the base station pilot transmission power, the base station pilot PN phase offset, and the data rate of the paging channel. The mobile station may set the system time with this information and determine the signal power for transmitting the call. The sync channel is spread by 32 Walsh functions before being transmitted.

Paging Channel Once a mobile station obtains time synchronization information from the sync channel message, the mobile station adjusts its timing to the system time. As with the sync channel, the call channel is coded and interleaved and the modulated spread spectrum signal is transmitted. There may be up to seven call channels in one CDMA frequency band (1.23 MHz).

The calling channel transmits specific information. Unlike synchronous channels, however, they transmit at higher data rates and offer a wide variety of messages. Depending on the type of message, specific information may only be sent to specific mobile stations. The data rate of the call channel is predefined through the sync channel, and is determined by comparing the frequency of use and the reliability relationship of the call channel. In general, all domestic operators are using 9.6 Kbps, which is about 180 times a second to call the mobile station.

The call channel is repeated with a maximum of 2048 slots of 80msec units, and each slot consists of four call frames. The message carried on the call channel consists of the information related to the overall system configuration and information such as the mobile station call and the response to the mobile station request.

There are four types of messages that the base station sends to the mobile station through the calling channel: overhead, paging, order, channel assignment messages, and the like.

First, the overhead message consists of four messages: a system parmeter message, an access parameter message, a neighbor list message, and a CDMA channel list message. Pass information about the configuration. Among these, a system parmeter message includes a call channel type, a registration parameter, an aid pilot acquisition parameter, and the like.

An access parameter message includes information about the type of access channel and control parameters. The neighbor list message contains information about the time offset of the pilot PN and the type of the basic neighbor base station, so that the handoff is quick. The CDMA channel list message allows the user to correctly determine whether to find the CDMA frequency band and the corresponding call channel.

The second form, call message, contains call information sent to one or more mobile stations. Calls are generally sent when a base station receives a call requiring communication with a mobile station, and is usually sent at several base stations. The third type of command message is a collection of many messages and is used to exclude specific mobile stations. A message is included to handle everything from acknowledgment of registration to preventing unintended mobile stations from transmitting.

The fourth form of channel assignment message allows the base station to assign a traffic channel to the mobile station and either change the assignment of the calling channel or instruct the mobile station to use an analog FM system.

After acquiring system synchronization with the base station using the pilot channel, the mobile station receives a message of the synchronization channel to synchronize timing with the system, and then continuously monitors the paging channel. If there is more than one paging channel supported by the base station, the mobile station finds a paging channel to monitor by turning a hashing function.

The paging channel divides the system time into smaller slots of 80ms with 2048 cycles, which are called slots of the paging channel. The mobile station can use the slot mode, which monitors the paging channel only for a certain slot to reduce its power consumption and disables for the rest. A mobile station not operating in slot mode can receive messages delivered to it in any slot, but must monitor all slots.

The present invention will be described in detail with reference to the accompanying drawings and the core of the present invention.

In the present invention, the base station uses a call channel that is not used as a call indication channel. In the description of the present invention, the call channel, the first call channel, the call indication channel and the second call channel are used in the same meaning.

For example, since the call channel using Walsh-7 is rarely used, the call channel is preferably used as a call indication channel. Information of such a channel may be transmitted as system information, or a predetermined channel may be used. The structure of the call indication channel is the same as that of the existing call channel (frame, spreading, etc.) so that there is no change in the existing base station hardware. However, the slot configuration of the call indication channel is different from the call channel.

The mobile station performs a stabilization function to keep the functions necessary for reception, such as an oscillator and a power amplifier, in a stabilized state when the sleep ends. The CDMA demodulation function is performed after stabilizing all receiving-related peripheral devices of the mobile station. In the present invention, the CDMA demodulation function simultaneously performs call channel reception and call indication channel reception. The call indication method of IMT-2000 is a sequential method in which a mobile station receives a paging channel after receiving a call indication channel, whereas the present method is characterized in that demodulation is performed at the same time.

If it is determined that the demodulation result of the call indication channel is unnecessary (positive result), the mobile station immediately stops receiving the entire slot of 80 msec and transitions to the sleep state, thereby reducing power consumption of the mobile station.

When a mobile station to which the present method is applied is used in a mobile communication network in which the method presented in the present invention is used, since the call indication state always indicates that call channel reception is necessary because the existing mobile station does not have a call indication channel reception function, the call channel reception is called. There is no state interrupted by the indication.

On the contrary, since the mobile station to which the present method is applied does not transmit the call indication channel from the base station in the unapplied base station area, the call indication reception is always shown as Negative (requires paging channel reception) at the mobile station. Receive (35). That is, even if the method proposed in the present invention is applied to the existing IS-95 A / B, there is no problem in compatibility with the existing base station and the terminal.

In the present invention, in order to stop the reception of the paging channel quickly, demodulation of the call indication channel must be performed quickly. For this purpose, the information of the call indication channel can be confirmed regardless of the energy of the corresponding channel and the decoding of the channel. It is preferable that the method be made between frame receivers within 20 msec.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates an embodiment of a terminal configuration capable of extending a mobile station waiting time according to the present invention. The mobile communication terminal for transmitting and receiving information to and from the mobile communication base station includes an RF unit 110, a signal replication unit 120, a first modem 130, a second modem 140, and a call processor connected to the antenna 100. 150).

The RF unit 110 is connected to the antenna 100 to perform transmission and reception of signals, and the signal replication unit 120 generates first and second signals substantially the same as the signals received by the RF unit, respectively. The first modem 130 performs system synchronization and slot synchronization through the first signal, and performs call channel reception through the first signal.

The second modem 140 receives the synchronization related information 11 from the first modem to match the slot synchronization, detects the information on the necessity of checking whether the call is made to the terminal through the second signal, If there is no information sent to the call confirmation unnecessary information 12 call processing unit 150 to inform it. Such a first modem and a second modem can be used as a conventional mobile communication modem.

When the call processing unit 150 receives call confirmation unnecessary information from the second modem that there is no need for call confirmation, the call processing unit 150 stops receiving the call channel in the first modem and transitions the terminal to the sleep state. This allows the terminal to extend the life of the battery.

2 illustrates one embodiment of a mobile station wait time extension method in accordance with the present invention. A signal received from the base station generates a first signal and a second signal substantially the same as the signal, respectively (200). This is to perform demodulation on two call channels simultaneously. Applicable to the terminal described above, the first signal is sent to the first modem to achieve system synchronization and slot synchronization through the first signal. When the synchronization is established, the synchronization information of the first modem may be transmitted to the second modem (11) to achieve slot synchronization for demodulation of the second signal in the second modem (210).

After the slot synchronization is performed, the second modem detects information on the necessity of checking whether the call is made to the terminal through the second signal when the second modem wakes up (220). For convenience of explanation of these steps, we will first look at FIGS. 4 and 5.

4 illustrates an example of a transmission / reception method of a call channel in a conventional mobile communication network, and FIG. 5 illustrates an embodiment of a structure of a call channel and a slot structure of a call channel according to the present invention.

In FIG. 4, a call channel transmission 40 and a call channel reception 41 are shown. A corresponds to a warm-up time for stabilizing elements necessary for reception, such as an amplifier and an oscillator, in the terminal, and B Corresponds to the preparation time required for receiving information, such as synchronization acquisition for the calling channel, and C corresponds to the reception slot time of the corresponding mobile station of 80 msec.

In FIG. 5, the call channel slot structure 50 and the call indication channel 51 are shown, where D corresponds to the time offset of the call channel and the call indication channel, and E is the information transmission time of the call indication. F represents the time at which call indication information transmission is stopped. In this case, the time offset D between the call channel and the call channel preferably allocates a time B necessary for reception of the call channel at the mobile station. In addition, in Fig. 5, the call instruction transmission time E is preferably a multiple of 20 msec to have the same structure as the call channel.

As described above, the call channel transmitted from the mobile communication base station includes various information. The structure of the call channel according to the present invention includes information included in the first call channel and the second call channel including the information. It can be characterized.

In this case, the second call channel may be the same as the first call channel in a frame configuration and spreading scheme, and the time offset is prepared to wake up for the first call channel. It is preferable to settle within time. This call channel structure can also be applied to CDMA communication base stations.

If there is no need for demodulation of the first call channel as a result of the demodulation of the second call channel, the reception of the call channel through the first signal is stopped and the terminal transitions to a sleep state, and if necessary, the call channel through the first signal. Continue receiving.

FIG. 3 illustrates an embodiment of a method for interrupting a call channel reception by receiving a call indication channel according to the present invention, in which the sleep state is terminated in the slot mode (30), and the mobile station receives the oscillator, the power amplifier, and the like when the sleep is terminated. Perform a warm-up function to maintain the necessary functions in a stabilized state (31). The CDMA demodulation function is performed after stabilizing all receiving-related peripheral devices of the mobile station. In the present invention, the CDMA demodulation function simultaneously performs paging channel 32 reception and paging indicator channel 33 reception. The paging indicator method of IMT-2000 is a sequential method of receiving a paging channel after receiving a paging indicator channel in the mobile station, whereas the present method is characterized in that demodulation is performed at the same time.

When the demodulation result of the call indication channel is judged (34), if it is determined that the reception of the call channel is necessary (negative), the receiver continues to receive the call channel of 80 msec (35), and if it is determined that it is unnecessary (positive result), the mobile station immediately receives 80 msec. The power consumption of the mobile station is reduced because the entire slot reception is stopped 36 and the device enters the sleep state.

The present invention will be summarized. The present invention relates to a transmission / reception method of increasing a waiting time of a mobile station without changing the existing mobile communication network by using a paging channel as a paging indicator channel in an existing CDMA mobile communication system. The present invention is composed of a base station transmitting a call indication in parallel with a call channel and a mobile station capable of simultaneously receiving a call channel and a call indication channel.

According to the present invention, the base station uses one of the unused call channels as the call indication channel, and the mobile station simultaneously receives and modulates the call channel and the call indication channel so that the call indication information does not need to receive the call channel information. In this case, the 80msec paging channel reception can be stopped in the middle to increase the standby time of the mobile station to maximize the battery usage efficiency.

The present invention solves the following problems in order to apply the paging indicator method in the IMT-2000 to the base station of the existing IS-95 A / B method. That is, first, the frame and configuration of the call indication channel is different from the channel structure of the existing IS-95 A / B, and it is difficult to implement in existing modems and hardware devices, and second, to the IS-95 A / B. When a new method of call indication is given, the existing IS-95 A / B terminal does not have a call indication channel reception function and thus cannot be used.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy disk, flash memory, optical data storage device, and also carrier waves (for example, transmission over the Internet). It also includes the implementation in the form of. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

According to the present invention, the present invention minimizes the changes in the mobile communication scheme such as the IS-95 A / B scheme and maintains compatibility with the current base station and the mobile station. It can reduce power consumption and increase standby time.

Claims (8)

A mobile communication terminal for transmitting and receiving information with a mobile communication base station, An RF unit connected to an antenna and responsible for transmitting and receiving a signal; A signal replication unit for generating a first signal and a second signal substantially the same as the signal received by the RF unit; A first modem configured to achieve system synchronization and slot synchronization through the first signal and to perform call channel reception through the first signal; Receiving synchronization-related information from the first modem to match slot synchronization, and detects information on the necessity of confirming the call to the terminal through the second signal, and if there is no necessity, call confirmation unnecessary information is notified. A second modem sent to the call processor; And And a call processor which receives the call confirmation unnecessary information from the second modem, stops receiving a call channel in the first modem, and transitions the terminal to a sleep state. In the method of receiving a call channel in the mobile communication terminal, (a) generating a signal received from the base station, the first signal and the second signal being substantially identical to the signal, respectively; (b) slot synchronization by the first signal; (c) detecting information on the necessity of confirming whether a call is made to the terminal through the second signal when waking up according to the slot synchronization; And (d) stopping the call channel reception through the first signal and transitioning the terminal to the sleep state if there is no need, and continuing to perform the call channel reception through the first signal if necessary. Paging channel reception method. 3. The method of claim 2, wherein step (b) achieves slot synchronization through the first signal, thereby matching slot synchronization for demodulation of the second signal. In the call channel structure transmitted by the mobile communication base station, A first calling channel comprising an overhead message conveyed to all mobile stations in the base station service area and information on the specific mobile station; And A call channel structure comprising a second call channel having a predetermined time offset with the first call channel and including information on whether a first call channel needs to be received in a slot configuration method. . 5. The call channel structure of claim 4, wherein the second call channel is the same as the first call channel in frame configuration and spreading scheme. 5. The call channel structure of claim 4, wherein the time offset is set within a wake up preparation time for the first call channel. A CDMA communication base station transmitting information using the call channel structure of claim 4. In the method of receiving a call channel in the mobile communication terminal, (a) generating a signal received from the base station, the first signal and the second signal being substantially identical to the signal, respectively; (b) slot synchronization by the first signal; (c) detecting information on the necessity of confirming whether a call is made to the terminal through the second signal when waking up according to the slot synchronization; And (d) stopping the call channel reception via the first signal and transitioning the terminal to the sleep state if there is no need, and continuing to perform the call channel reception via the first signal if necessary; A computer-readable recording medium that records a program for the program.