KR20070088354A - Method for increasing the standby battery life in mobile device - Google Patents

Abstract

A method for extending a battery standby time in a mobile terminal is provided to reduce the time required for monitoring the paging message of a used cell by using a decisive and adaptive process having no influence on call performance, thereby extending the battery lifespan of a GSM(Global System for Mobile communication) mobile device. A method for extending a battery standby time in a mobile terminal comprises the following steps of: setting up an actual skip frequency with a smaller frequency than the maximum paging repetition frequency of an available paging message determined by a paging period variable; skipping reception of the available paging message as many as the actual skip frequency if a wireless environment status satisfies a predetermined condition, and setting up a battery saving mode while the available paging message is not received(112).

Description

How to extend battery standby time of mobile device {METHOD FOR INCREASING THE STANDBY BATTERY LIFE IN MOBILE DEVICE}

1 is a view showing a conventional Global System for Mobile Communications (GSM) cellular system,

2 is a diagram illustrating a configuration of 51 multiframes of a conventional GSM downlink;

3 is a view showing the configuration of a mobile terminal to which the present invention is applied;

4A and 4B illustrate a control process according to an embodiment of the present invention.

The present invention relates to a mobile terminal, and more particularly, to a method and system for extending battery latency of a Global System for Mobile Communications (GSM) mobile terminal.

Since the invention of the first wireless mobile phone, cell-technology has become the preferred standard of wireless mobile communication systems around the world. The cellular communication system is typically represented in a honeycomb structure, as shown in FIG. 1 is a diagram illustrating a conventional GSM cellular system. Referring to FIG. 1, a plurality of cells 10 are included, and the cell 10 includes a base transceiver station (hereinafter referred to as a BTS) 20 having a radio transmitter and a radio receiver. Each cell 10 provides a service to a number of fixed or roaming mobile terminals 30 within a service range. Multiple cell 10 configurations may span the entire geographic area and provide complete coverage to the mobile terminal 30 within the entire area. However, at any time, a particular mobile terminal is served from a single cell or BTS, as will be appreciated by those of ordinary skill in the art. This is as shown in FIG. It will be understood by those skilled in the art that only other aspects of the BTS that are closely related to the present invention by omitting inadequate complexity are indicated in FIG.

The operation of the idle mode of the mobile terminal can be described generally as follows:

1: Read the information of the paging channel and confirm the paging message indicating the call reception or short message notified from the network.

2: Known in the art as a received signal strength indication, it collects the received signal strength of the serving cell, hereinafter referred to as Received Signal Strength Indication / Indicator (RSSI).

3: Scan a plurality of neighboring cells surrounding the mobile terminal to collect RSSI for each cell.

4: After evaluating whether there is a neighbor cell (s) having a higher RSSI compared to the serving cell, among the plurality of cells having a higher RSSI than the serving cell, the neighbor cell having the maximum RSSI at a specific timing is reselected. Upon reselection, repeat step 1 through step 4 for the new cell.

The characteristic that the mobile terminal can meet the first purpose of the idle mode operation determines the quality of service for the particular mobile terminal. If the mobile terminal can decode information about the paging channel transmitted from the network without too many failures, it can be considered that the mobile terminal receives good quality of service from the serving cell.

The battery of the mobile terminal consumes a considerable amount in the process of receiving data from the downlink display frequency by turning on the radio frequency (RF) part, thereby shortening the standby time of the battery. Therefore, the average waiting time of the mobile terminal according to the four steps, that is, the steps 1 to 4 can be expressed as follows.

Standby time (hours) = [battery capacity (milliampere-hours) / average current consumption (milampere)]

In the wireless communication protocol, the main contributing factor to the average current consumption is the operation of the RF unit section which achieves the four idle mode goals by monitoring, reading or scanning radio frequencies. The operation of the RF unit 95 in the idle mode can be summarized as follows.

Activity of RF section in idle mode = RF reception of paging channel (PCH) data block of serving cell and its RSSI collection + RF scanning of radio frequency of neighbor cell to obtain each RSSI

In light of the above summary, it is clear that one or both of the two factors need to be optimized to manage the battery.

Accordingly, in the related art, the speed of scanning neighboring cells is optimized based on a specific factor, thereby optimizing an aspect of neighboring cell scanning, thereby periodically reducing the use of the RF unit 95, that is, current consumption. The mobile terminal periodically monitors the paging channel to confirm the moment of call reception. It is the network's responsibility to send a call reception notification to the mobile terminal, and the network receives an incoming call notification signal such as a paging message at a predetermined position of a paging channel (PCH) which is also known to the mobile terminal. Notify that there is a call. The mobile terminal knows in advance the location of the paging channel through which the network sends a notification signal for the incoming call. Notification signal location or notification signal scheduling of the paging channel is predetermined and coincides between the network and the mobile terminal. The mobile terminal autonomously evaluates the scheduling period using a standard network variable such as BS_PA_MFRMS in the GSM scheme and a specific standard network variable such as a slot cycle index (SCI) in the Code Devision Multiple Access (CDMA) scheme.

Since the call signal for the mobile terminal is periodically received at a specific time, the mobile terminal needs to read data transmitted to the paging channel at predetermined intervals every time it checks whether there is a designated call reception. In addition, since the mobile communication system does not want the call success rate to be lowered, strict rules for receiving paging messages on the paging channel are enforced. FIG. 2 is a diagram illustrating a configuration of a multiframe of a conventional GSM downlink. Referring to FIG. 2, the configuration of a multiframe of a downlink is as follows. As illustrated in FIG. 2, the multiframes 61, 63, 65, 67, and 69 are periodically repeated five times. The downlink BCCH carrier (or mark frequency) of the GSM cell constituting each multiframe carries paging information in the paging channel, labeled "PCH". Multiframes are discontinuous reception (DRX), whereby the mobile terminal determines the periodic intervals at which it is necessary to read the data of the paging channel. During the time when the paging channel is not read, the mobile terminal cuts off the RF unit 95 to save battery. In GSM, the periodic interval is determined by the variable BS_PA_MFRMA and the mobile terminal is required to read paging channel data periodically. 2 illustrates a scenario where the network uses five BS_PA_MFRMSs. The mobile terminals know the same thing and wake up periodically to read each paging message. DRX in CDMA is replaced by the concept of Slot Cycle Index (SCI). Referring to FIG. 2, it can be seen that the mobile terminal reads a paging message from paging channel block 2 denoted by PCH2 existing on the 0 th multiframe 61 in a multiframe which is periodically repeated five times. Subsequently, the mobile terminal of the RF unit 95 is configured for all paging channel blocks occurring in the first multiframe 63, the second multiframe 65, the third multiframe 67, and the fourth multiframe 69. Abort the operation. The mobile terminal sequentially reads the paging message of the next example from the paging channel block 2 existing in the fifth multiframe 71 in order, and confirms the call reception through the paging message. Upon confirming the call reception, the mobile terminal prepares itself for the cell and starts a designated connection with the network. If no call is received, the mobile terminal discards the paging message and waits for the next paging message.

Whenever there is an incoming call to a mobile terminal, the network sends the incoming call notification signal to the mobile terminal by paging the mobile terminal using an identifier inside an appropriate paging channel block. The mobile terminal is expected to receive all instances of the paging message in the appropriate period and responds to the incoming call. However, it is not guaranteed that the mobile terminal decodes the specific paging message including the incoming call notification signal on the first attempt. Therefore, the network transmits an incoming call notification signal to the mobile terminal at the next periodic interval. Typically, the network sends up to K times the incoming call notification signal for the single incoming call to the mobile terminal before giving up. The maximum number of incoming call notifications of K times is referred to as the maximum paging repetition number, and the value of the maximum paging repetition number depends on the network and is changed from network to network.

 US Patent No. 6,628,972 describes a method for extending the slot cycle index (SCI) of a CDMA according to a mobile terminal to read a paging message in a paging message. Applying the method described above in US Patent No. 6,628,972 to GSM can be configured to extend the DRX cycle, whereby the mobile terminal skips the allocated paging channel read interval as indicated by BS_PA_MFRMS, instead For example, paging messages are alternately read or a plurality of BS_PA-MFRMSs are read out. Alternate reading of the effective paging channel can reduce battery usage by about 50%. Omitting further reading of the paging channel further reduces battery usage. However, the scheme proposed by US Pat. No. 6,628,972 has the following problems: a) a nondeterministic approach that can degrade the call performance of a mobile terminal (MT) due to frequent paging failures and b) quasi-adaptation signals. This is an inadequate approach that increases the likelihood that the MT misses a call in the condition domain. In both cases, you can't miss a single paging message.

As illustrated by US Pat. No. 6,628,972, conventionally, the concept of extending the SCI or DRX interval belonging to the GSM standard is introduced in any manner without a specific deterministic approach. Conventionally, the approach has relied on obtaining a time interval from the mobile phone user when the user sometimes wants to use the mobile phone. When the time interval begins, the mobile phone doubles, triples, or increases NX the SCI or DRX, skipping N consecutive paging messages that are thought to be read according to the protocol specification. The user, in rare cases, still waits for call reception. Each time there is an incoming call, the network sends a paging message indicating that there are multiple incoming multiples, ranging from 1 to multiple critical multiples, up to the maximum number of paging repetitions. If the SCI or DRX interval extends to the actual skip count, and the actual skip count is greater than the maximum paging repetition count, when the network actually announces the incoming call, the mobile terminal skips the paging message including the incoming call notification to miss the call reception. do. Prior art has not attempted to address these elements in a procedural manner in this respect, resulting in battery saving techniques with strict performance and adequate loopholes. A decisive selection range of the actual number of skips is required and should not be selected unconditionally. In addition, the term "rarely" is a very vague concept in the technical field. In this case, the user's expectation can be just two things: a) the user is waiting for a call, or b) the user is not waiting for any call. In the case of a), the mobile terminal must not miss the incoming call. In the case of b), the mobile terminal is further in a standby mode for a long time, as will be appreciated by those skilled in the art, which can significantly save the battery. If the user says "sometimes" waiting for the call, it implies that the user is waiting for the call for various purposes, and so is the case for a). With this expectation, the reading of the paging message cannot be omitted in a non-deterministic manner over time intervals, and cannot compromise the call performance of the mobile terminal.

In addition, the prior art did not suggest any means for resolving that the maximum number of paging iterations is likely to result in a non-deterministic approach. If the mobile terminal could accurately evaluate the maximum number of paging iterations, the mobile terminal could accurately adjust the actual number of skips so that the battery would be saved all the time unless performance was abandoned. By vaguely choosing the actual number of skips, as mentioned earlier, a negative effect can be obtained. In addition, a wireless communication system that has attempted to provide information regarding the maximum number of paging repetitions to prepared mobile terminals is not known in the prior art. In the prior art, the element of saving the battery based on the network by transmitting the pattern in which paging is transmitted and the paging repetition factor is missed.

There is still an important aspect missed in the prior art of extending the DRX interval or the SCI interval, whereby it can be easily affected by low access or variable signal conditions, and as a result the MT-call performance is not optimized. Assume that the prior art determines whether to use the actual skip count of one. This means that the mobile terminal will selectively read a valid paging message. Also assume that the mobile terminal is roaming to an area with poor signal conditions. The mobile terminal reads the first paging message to confirm that there is no incoming call. The mobile terminal also assessed the RSSI (Received Signal Strength Indication) and the Signal to Noise Ratio (SNR) of the air interface to confirm that the air interface is poor. According to the prior art, the mobile terminal unconditionally skips the next paging message to perform a battery saving process. Suppose there is an incoming call at this moment and the network has sent a notification to it in the paging message and sent it to the mobile terminal. The mobile terminal can decrypt the paging message at this moment but skips it. The network will once again send a notification message to the next paging message. However, because the signal condition is poor, the mobile terminal cannot decrypt the paging message and the next paging message of this attempt. This results in missed MT calls. Thus, the prior art adopting the unconditional paging skip technique does not account for the deteriorating signal condition. This kind of scenario is likely to fail in the life of the mobile terminal, especially when the mobile terminal is roaming in areas of high interference.

As described above, in the prior art, no attempt has been made to intelligently handle the battery saving procedure when signal conditions are poor or deteriorating. Under this signal condition, the mobile terminal should not miss one paging message because it cannot guarantee success in decoding the next paging message.

The present invention provides a method and system that can extend the paging-read interval so that the mobile terminal does not compromise MT-call performance in the extension step by not missing any incoming call while the battery time saving algorithm is executed. .

The present invention provides a method and system that enables a mobile terminal to evaluate the number of incoming call notifications adopted by a GSM wireless communication network with high accuracy and to autonomously execute and derive the number of notifications. The present invention provides a method and system for inducing a network to send a notification message for an incoming call to a mobile terminal several times, thereby maximizing the paging-reading time without affecting MT-call performance. .

The present invention provides a method and system that can save battery by extending paging-reading time through signal condition analysis.

The present invention conforms to the protocol standard of the existing wireless communication system, and provides a method and system for allowing a mobile terminal to grasp an accurate number of incoming call notifications and a transmission pattern of a notification message.

The present invention provides a method and system that can extend the battery standby life of a GSM mobile device by reducing monitoring of the paging message of the cell in use using deterministic and adaptive procedures that have no effect on call performance.

Other objects, features, and advantages of the invention will be understood from the following detailed description of the invention in conjunction with the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. It is to be understood that the disclosed embodiments are merely examples of the invention, which can be embodied in various forms. The following detailed description and drawings should not be construed as limiting the invention, but as a basis for claiming and as a basis for informing the person skilled in the art how to complete and use the invention, A number of specific embodiments are described to aid the overall understanding of the invention. However, in a specific example, well-known details or conventional details are not described in detail so as not to unnecessarily obscure the present invention.

The present invention relates to a cellular wireless communication system that performs the principle of a paging channel to obtain a specified attention of a mobile terminal in use. In the wireless communication system, the mobile terminal in use needs to monitor the paging channel at regular intervals to obtain a specified attention, to pay attention to all the needs of the wireless communication system, in particular to receive an incoming call or to receive a short message. There is.

2 shows a typical TDMA based GSM downlink beacon. Each frame 81 constituting the multiframe is divided into eight time-slots. In a GSM system, downlink beacons are sent in the 0 th time-slot of the beacon frequency. Each multiframe (61, 63, 65, 67, 69) consists of a total of 51 multiframe structure, all information is transmitted through the 0th time-slot. Common Control Channel (CCCH) blocks include a paging channel. As is known, one 51-multiframe includes nine paging channel blocks. A particular mobile terminal user needs to monitor only one of the nine paging channel blocks, which can be determined autonomously within the mobile terminal using known equations, as will be appreciated by those of ordinary skill in the art. do. 2 shows multiframes transmitted at five paging period intervals. That is, BS_PA_MFRMS equal to 5 indicates that the paging block for the mobile terminal lies behind five 51-multi frames. The mobile terminal reads the paging message from the 0 th multiframe 61 and then skips the next 4 multiframes 63, 65, 67, 69 and nine available paging channel blocks in the fifth multiframe 71. Reread the appropriate paging channel block from. This interval in the present invention is referred to as paging-read interval. During times other than the paging read interval, the mobile terminal cuts off multiple power consuming circuits to save battery. This response is known as DRX in the existing GSM domain. When an incoming call is received by a specific mobile terminal or when the network attempts to make a specific connection with a specific mobile terminal, the network checks the identity of the mobile terminal in the downlink paging message and configures the multiframe 61 shown in FIG. Included in the appropriate paging channel block of the channel to transmit. The associated mobile terminal, which reads every instance of the downlink paging message, begins the process of identifying the identity in the paging message and connecting to the network using a particular standard protocol specification. For the remaining time, if the network does not verify the identity of the mobile terminal in the paging message, the network simply discards it after reading the message at the first place. Based on the foregoing, the importance and necessity of reading downlink paging messages became clear at this point. Any attempt to save battery by reducing the frequency of reading valid paging messages has the adverse effect of missing incoming calls, unless the read frequency is reduced and the decision process to skip valid paging messages is not a deliberate process.

The present invention ensures that missed calls are skipped by skipping valid paging messages, and that the battery saving process is executed without the need for the user to set a predetermined time interval if there is no interference from the user and the user waits only occasionally. This demonstrates a decisive and appropriate way to support the battery saving process without adversely affecting MT-call performance. By completing a continuous battery saving process with a new decision method, the method proposed by the present invention allows the mobile terminal to save a larger amount of battery than the prior art method, and at the same time, never fails to receive an incoming call. none.

The mobile terminal also includes a central processing unit 91 that executes software logic, a set of software timers 92, a counter 92, flags for performing the method, and volatile RAM for storing temporary digital data. A memory section 96 (RAM) or a non-volatile ROM (ROM), execution software logic for executing a given wireless communication protocol, GSM of this embodiment, and air interface signal parameters and calculating the state of the air interface environment. And a digital signal processor 94 and an RF (Radio Frequency) unit 95.

The mobile terminal utilizes a method of high accuracy evaluating incoming call notifications transmitted the maximum number of times before the network gives up, without any additional support from the network. The maximum notification repetition rate per incoming call, that is, the maximum number of paging repetitions associated with the incoming call notification, is represented by MAX_PAGE_REPEAT_FACTOR. Since no wireless communication system transmits the information in any of the formulas or methods by which the mobile terminal evaluates the information with high accuracy, there are no known techniques in the prior art that the mobile terminal can obtain the repetition rate value. As can be understood from the foregoing description, the mobile terminal autonomously calculates the repetition rate using a formula claiming as a preferred embodiment of the present invention and employing BS_PA_MFRMS representing a paging period as an existing network transmission variable. Finally, the maximum possible value of MAX_PAGE_REPEAT_FACTOR can be provided. The output of the formula provides an upper limit of the paging repetition rate, i.e. the maximum number of times the network sends a notification for an incoming call. This may be expressed as in Equation 1.

MAX_PAGE_REPEAT_FACTOR = [(90 DIV BS_PA_MFRMS) DIV 4]

In Equation 1, "DIV" denotes a general mathematical integer division. By referring to conventional values, the values of the equations are elaborated in the next chapter. The above formula is described in terms of a GSM communication system and is claimed as a preferred embodiment of the present invention. As mentioned herein, wireless communication systems having multiple connection technologies, which are unique from the above formulas but ultimately achieve the same purpose, are included in the scope of the present invention.

The mobile terminal reads an example of the valid paging message and then skips a certain number of valid paging messages consecutively until rereading. The maximum number of valid paging messages that the mobile terminal skips without compromising the MT-call performance, i.e., the maximum number of paging skipping attempts, will be represented by MAX_PAGE_SKIP_ATTEMPT. Obviously, the maximum number of paging skip attempts possible is always less than 1 than MAX_PAGE_REPEAT_FACTOR, which can be written as:

MAX_PAGE_SKIP_ATTEMPT = MAX_PAGE_REPEAT_FACTOR-1

In addition, the number of consecutive paging skip attempts that the mobile terminal actually attempts to extend battery life, that is, the actual skip number, will be referred to as ACTUAL_SKIP_FACTOR. The mobile terminal relies on the action implemented by conventional specifications without battery saving. When the actual skip count ACTUAL_SKIP_FACTOR obtains a value of 0, the mobile terminal may set the ACTUAL_SKIP_FACTOR value within the following range, that is, {0, MAX_PAGE_SKIP_ATTEMPT}. However, the actual value of the ACTUAL_SKIP_FACTOR can be determined in such a way that there is no opportunity to miss an incoming call based on the desired degree of battery saving. The value is always within the above-described range and is left to one of ordinary skill in the art. The method combines deterministic elements into the decision process such that the MAX_PAGE_SKIP_ATTEMPT value is always less than the MAX_PAGE_REPEAT_FACTOR evaluated by the equation. The condition ensures that the mobile terminal does not skip paging more than the maximum number of times the network sends an acknowledgment signal for a single incoming call.

In addition, in order to incorporate the feedback-control element into the battery saving process, the mobile terminal stores the signal level, RSSI, signal quality, and SNR of the last received valid paging message. The most recently received RSSI and the most recently received SNR are represented as LAST_RX_RSSI and LAST_RX_SNR, respectively. The mobile terminal also stores the RSSI and SNR of several past samples that have read a valid paging message in a volatile or nonvolatile storage medium that typically acts as a memory array within the computer system. The size of the sample is indicated by the maximum sample size MAX_SAMPLE_SIZE, and the choice of sample size is left to those skilled in the art. Once the sample size is determined, the mobile terminal has an RSSI and SNR value of each of the recent MAX_SAMPLE_SIZE paging messages. The RSSI and SNR of the recent MAX_SAMPLE_SIZE paging messages stored are overwritten as new samples to the oldest sample each time a new paging message sample is read from the PCH. The most recent sample in the storage database corresponds to LAST_RX_RSSI and LAST_RX_SNR, as described above.

Before generating a valid paging message, the mobile terminal evaluates whether LAST_RX_RSSI and LAST_RX_SNR are greater than the minimum received RSSI MIN_RX_RSSI and the minimum received SNR MIN_RX_SNR, respectively. If the comparison indicates that the recently received RSSI and the recently received SNR are less than the minimum values, the output value of the comparison stops the battery saving process so that a single valid paging message is not skipped as external signal conditions are not favorable. Let's do it. The mobile terminal reads the paging message without skipping an incoming paging message and continues reading the paging message until conditions are favorable. On the other hand, if the comparison test indicates that LAST_RX_RSSI and LAST_RX_SNR are greater than their respective minimum values, a second test is performed to analyze the stored RSSI and SNR values of the recent MAX_SAMPLE_SIZE paging message, and a continuous deterioration tendency or negative slope is found. Observe if This analysis helps to predict the imminent degradation of the quality of service of the cell in use. If a trend of degradation is found, the output of these estimates will interrupt the battery saving process. The battery saving process remains suspended until it confirms that the recently received RSSI and SNR are greater than their respective minimum values. In addition, RSSI / SNR data analysis of the recent MAX_SAMPLE_SIZE paging message indicates a positive slope. This evaluation step is performed every hour before the generation of a valid paging message. If the evaluation step is indicated as "continue", the mobile terminal proceeds with a battery-saving process using an equation designed according to the paging-skip rule indicated by the prior method. It will be appreciated that the choice of MIN_RX_RSSI and MIN_RX_SNR is left to the ordinary knowledge in the art. In addition, how to perform RSSI / SNR data analysis of the recent MAX_SAMPLE_SIZE paging message is left to those of ordinary skill. However, the general process will be outlined with the foregoing description.

We will now explore the reasoning behind the designed equations to outline the general principles behind the selection of specific values. The network variable, ie the paging period variable BS_PA_MFRMS, is in the range of 2 to 9, as indicated by the protocol standard. A value of 2 means that a valid paging message for every mobile terminal present in the cell repeats every second multiframe or every 470 milliseconds ((51 * 2) frames * 4.616 milliseconds per frame), The value of 9 repeats every ninth multi-frame or every 2.11 seconds ((51 * 9) frames * 4.616 frames per frame), both of which have problems. If the minimum value is used, the mobile terminal has little opportunity to save battery due to very frequent PCH readings, so the standby life is shortened, and conversely, if the maximum value is used, the battery is saved to the maximum limit. However, there is a significant delay between successive paging messages, which degrades the performance of the network. As can be seen in most GSM networks, typical values used are 5, 6 and 7. In the remainder of the description, 5 is used as the paging period variable BS_PA_MFRMS as an example. In 103 of FIG. 2, a paging period in which BS_PA_MFRMS is 5 may be confirmed.

Now, in terms of the GSM standard, we will explain the reasoning behind our formula. The protocol standard enforces the mobile terminal to maintain a counter initialized to (90 DIV BS_PA_MFRMS). Those skilled in the art will appreciate that the counter is a downlink signaling counter (DSC). Each time the mobile terminal fails to decode the paging message, the counter is decremented by four, and incremented by one for each successful success, but never exceeding the initial value of (90 DIV BS_PA_MFRMS). In addition, the present specification means that when the downlink signaling counter drops to zero or less, the mobile terminal executes a cell release process to leave the current cell and move to another cell. When the counter drops to zero, it indicates that the quality of service of the current cell is below an acceptable limit. As these two rules are established, the present invention recognizes that when an incoming call is notified, the notification signal should be transmitted to the maximum before a particular cell in the network gives up. However, this repetitive attempt is not delivered to the mobile terminal in the call, and thus the present invention attempts to find a notification signal autonomously in the mobile terminal. The maximum number is not less than the tolerance the wireless mobile system forces the mobile terminal and the network must follow. In this particular embodiment, when 5 is used as the value of BS_PA_MFRMS, the downlink signaling counter is initialized to '18'. This is done continuously while the wireless communication system decrypts the paging message (ie, before the downlink signaling counter becomes less than zero) before the mobile terminal moves out of the current cell. Tolerate four failures (18-4 * 4 = 2). With this constraint, the mobile terminal fails to decrypt the first three examples of the paging message, but the fourth example of attempting and responding to the incoming call is likely to succeed, so that up to four consecutive attempts can be made before giving up. Sending a notification signal for an incoming call is essential for network cells. Thus, the mobile terminal can evaluate the maximum number of times the network continuously transmits a notification signal for a single incoming call by executing the equation described in the preferred embodiment of the present invention, mentioned in the preceding section. In a special case where BS_PA_MFRMS is 5, it can be calculated as follows using Equation 1 above.

MAX_PAGE_REPEAT_FACTOR = [(90 DIV 5) DIV 4] = INTEGER (4.5) = 4,

The operator INTEGER extracts the integer value of the recipe. Since the maximum number of paging repetitions to be adopted by the network is known, the value for the maximum possible skip number of valid paging messages that the mobile terminal relies on, without affecting the MT-call performance in any way, Using 2 we can calculate:

MAX_PAGE_SKIP_ATTEMPT = MAX_PAGE_REPEAT_FACTOR-1 = 3

Therefore, the ACTUAL_SKIP_FACTOR chosen for execution must be selected from the set specified by {0, 3}, where 0 corresponds to the action driven by the default specification, and 3 corresponds to the maximum number of paging skipping attempts yielding the maximum battery savings. Corresponds. If 1 is chosen as ACTUAL_SKIP_FACTOR, in the ideal case, the current consumption can be reduced by about half. Other values greater than 1 can theoretically reduce the current consumption rate by 50% or even more, thus doubling the life of the battery. In addition, during the battery saving process, even a single MT-call is missed by the range determination procedure. Typical ACTUAL_SKIP_FACTOR values proposed and defined in the present invention are 1 or 2. As will be appreciated by those skilled in the art, values greater than 2 greatly increase battery life, as well as increase the likelihood of increased call setup time. From the typical BS_PA_MFRMS values of 6, 7, and 8, one can infer a range of {0, 2}, {0, 2}, {0, 1}, respectively. As is known, the deterministic approach provides an upper limit of the maximum number of paging-skip attempts based on the paging period that the network is adopting. Since BS_PA_MFRMS is very possible from the method of the prior US Patent No. 6,628,972 for a network with 6 or more, a mobile terminal adopting an unconditional paging-skip procedure of three consecutive paging messages is very likely to miss an MT-call. Big.

In addition, in this embodiment, although the selection value is not limited, 5 is used as MAX_SAMPLE_SIZE. The curve is constructed to pass through five discrete points, and its slope is determined. The more examples there are, the better they are to evaluate, but the combined cost increases. The slope of the curve represents the trend of the air interface, the negative slope represents a sharp drop, and the positive or zero slope represents an acceptable condition. MIN_RX_RSSI and MIN_RX_SNR are selected according to the sensitivity of the RF unit 95 of the mobile terminal with reference to the reference sensitivity listed in the protocol specification. Those skilled in the art will understand the procedure.

In relation to the general principle of selecting a particular threshold identified, the operating procedure of the mobile terminal is shown in FIG. 4A and B, in step 101, the mobile terminal is in an idle mode in a non-call state. Under idle mode, the mobile station begins to read a number of system information called SYSINFO (hereinafter referred to as cisinfo), in which the BTS of the currently located cell transmits via a downlink beacon frequency called CCCH. Among other information elements, due to one particular system information variable, the mobile terminal recognizes the paging interval period adopted by the BTS. In GSM terms, the paging interval period is identified by the paging period variable BS_PA_MFRMS. Thereafter, the mobile terminal proceeds to step 102 and checks whether all system information has been acquired. If the entire system information has not been obtained, the mobile terminal repeats the operation of step 101 to effectively ensure that all transmitted system information variables are read at least once. . Upon receipt of the cisinfo variables, the mobile terminal stores all of the cisinfo variables, i.e., cisinfo information, in memory section 96 for later use. All these cisinfo variables are associated with a particular BTS. However, the mobile terminal may be located in a service area of another BTS, or may be located in an area where two BTSs simultaneously provide a service. Accordingly, while storing the cisinfo information in the memory unit 96, the mobile terminal indicates that the information is received under a specific cell and stores it, and separately maintains each information block corresponding to each BTS. The mobile terminal periodically updates the cisinfo variables while staying in a particular cell to check which of the variables has changed. If the changed variable exists, the mobile terminal updates the corresponding variables in the memory unit 96 and stores all the variables included in the system info information. The concept of the periodic update of the cisinfo variable is not related to the spirit of the present invention, as will be understood by those skilled in the art, and thus further description thereof is omitted.

As soon as all of the system information variables are received, the mobile terminal proceeds to step 103 and not only initializes specific variables used in the present invention, for example, MAX_SAMPLE_SIZE, LAST_RX_RSSI, LAST_RX_SNR, MIN_RX_RSSI, MIN _RX_SNR, and the number of skip attempts. Prepare the battery saving process by calculating the appropriate variables, for example, the maximum number of paging iterations, the maximum number of paging skip attempts, and the actual number of skips. The mobile terminal stores a set of data variables consisting of LAST_RX_RSSI and LAST_RX_SNR in the memory unit 96 to assist the battery saving process. In step 103, the mobile terminal executes the above equations to evaluate the repeated incoming-call notification attempt adopted by the BTS. If the maximum number of paging repetitions is known and stored for future use, the mobile terminal evaluates the range of the maximum number of paging skip attempts and then selects a value suitable for the actual number of skips to use for battery savings. For the purpose of explanation, 5 is adopted as BS_PA_MFRMS. The remaining optimized variables, that is, the maximum number of paging repetitions and the maximum number of paging skip attempts are calculated using Equations 1 and 2 as follows.

MAX_PAGE_REPEAT_FACTOR = (90 DIV 5) DIV 4 = 4

MAX_PAGE_SKIP_ATTEMPT = MAX_PAGE_REPEAT_FACTOR-1 = 3

Accordingly, it has a maximum number of paging skipping attempts in a deterministic range of {0,3}. ACTUAL_SKIP_FACTOR is a value that should be included in the {0, 3} set, which means that the paging messages should be read out alternately. All variables thus calculated are stored as data storage variables in the memory unit 96 of the mobile terminal. In addition to the initialization of the variables which aid in the deterministic aspect of the present invention, the mobile terminal also exists as data variables in the memory section 96. That is, it initializes LAST_RX_RSSI and LAST_RX_SNR, which aids in a suitable single condition sensing aspect of the present invention. MAX_SAMPLE_SIZE determines the size of the data variable and is typically implemented as a memory array of the mobile terminal. The array stores RSSI and SNR values of the received signal in a recent MAX_SAMPLE_SIZE paging message sample, while reading the paging messages from the PCH. Each time a new RSSI / SNR sample is received, the array is updated with the new RSSI / SNR. Filling the array with MAX_SAMPLE_SIZE samples discards the old sample and moves it to the left of the entire array, inserting new samples at the end of the array. In addition, the mobile terminal presets minimum values for RSSI and SNR, MIN_RX_RSSI and MIN_RX_SNR, and evaluates recently received RSSI and SNR obtained from recently-read paging message. Finally, the mobile terminal has the integer counter 93 so that the counter 93 tracks the number of paging messages actually skipped per battery saving session. The skip attempt count skip_attempt of the counter 93 is initialized to zero.

As described above, when the mobile terminal initializes the appropriate variables in step 103, the mobile terminal proceeds to step 104 to set the battery saving state. In the battery saving state, the mobile terminal saves most of the power consumption circuit such as the RF unit 95, the digital signal processing unit 94, and the central processing unit 91, thereby saving the battery. . It is the aim of the battery saving algorithm according to the invention to set and maintain the battery saving state as much as possible. In this state, the mobile terminal uses the paging period variable acquired in step 101 and stored in the memory unit 96 as BS_PA_MFRMS to calculate the generation period of the next valid paging message, and the next valid paging for the calculated period. The message is waiting to be received. After the calculated period, in step 105, the mobile terminal checks whether a valid paging channel block exists in the received paging channel, and proceeds to step 106 if there is a valid paging channel block. In step 106, the mobile terminal prepares all of the RF unit 95, the digital signal processing unit 94, and other related circuits, and successfully reads a paging message from the paging channel. As soon as the paging message is read, the mobile terminal evaluates whether there is an incoming call notification. If the incoming-call notification is confirmed, the mobile terminal attempts to exit the idle mode state and initiate a directed connection with the network. Those skilled in the art will appreciate that directed linkage procedures may be inappropriate for the present invention and may be skipped without affecting the brevity of the description. In the process shown in FIG. 4 according to an embodiment of the present invention, it is assumed that there is no incoming-call notification in the received paging message. The mobile terminal stores the RSSI and SNR of the received signal as LAST_RX_RSSI and LAST_RX_SNR, and updates the first sample of LAST_RX_RSSI and LAST_RX_SNR into the storage array. The size of the first sample is determined by MAX_SAMPLE_SIZE. The latest sample of size MAX_SAMPLE_SIZE that has entered the storage array is always two data variables, LAST_RX_RSSI and LAST_RX_SNR, that store the RSSI and SNR of the most recently received signal.

In step 107, the mobile terminal checks whether all of the special prerequisites for starting the operation of step 106, that is, the battery-saving process, are met. A prerequisite proposed by the present invention is to ensure that the mobile terminal updates the storage array with a minimum of MAX_SAMPLE_SIZE samples before starting the optimal process. If the value of MAX_SAMPLE_SIZE is 5, the conditional check ensures that the mobile terminal updates the storage array with previous samples of five RSSI / SNRs before starting the battery saving process. Other special prerequisites conceived by those skilled in the art can be matched to the condition check. If all the preconditions are not satisfied in step 107, the process proceeds to step 104 where the mobile terminal executes the battery saving processor and waits for the next paging message to occur. When the next paging message occurs, the mobile terminal proceeds to step 106 to read the paging message. The mobile terminal then updates the second RSSI / SNR sample to the second array location. Therefore, the mobile terminal stores five samples in the array, and assumes that the sample size is five. At this stage, the state of the array is as follows:

Array [0] .RSSI = RSSI of the first / oldest / first measured sample.

Array [0] .SNR = SNR of the first / oldest / first measured sample.

Array [1]. RSSI = RSSI of the second sample.

Array [1]. SNR = SNR of the second sample.

Array [2]. RSSI = RSSI of the third sample.

Array [2]. SNR = SNR of the third sample.

Array [3]. RSSI = RSSI of the fourth sample.

Array [3]. SNR = SNR of the fourth sample.

Array [4]. RSSI = RSSI of the fifth / most recent / last measured sample.

Array [4]. SNR = SNR of the fifth / most recent / last measured sample.

As soon as the prerequisite of the battery-saving process is met, the mobile terminal proceeds to step 108 of FIG. 4B via the connector 1. In step 108, the mobile terminal stops the operation of the RF unit 95, the central processing unit 91, and the digital signal processing unit 94, similarly to the step 104, and the next paging according to the period calculated according to the present invention. Wait for the channel's paging message to be received. In step 109, the mobile terminal checks whether a paging message is to be received. If the paging message is not to be received, the mobile terminal proceeds to step 108 and continues to save battery. If the paging message is to be received in step 109, the mobile communication terminal performs an adaptive signal condition detection check and applies the battery optimization technique instead of directly reading the paging message as in step 106. Evaluate.

Therefore, in step 110, the mobile communication terminal receives the recently received RSSI or the recently received SNR obtained from the storage array as the element array [MAX_SAMPLE_SIZE-1] .RSSI and the array [MAX_SAMPLE_SIZE-1] .SNR. Evaluate whether each is smaller than the initialized MIN_RX_RSSI and MIN_RX_SNR. The mobile terminal also attempts to analyze the entire storage array containing past MAX_SAMPLE_SIZE samples to assess the particular degradation trend. The actual logic of analyzing the RSSI / SNR array is left to those of ordinary skill in the art. If the recently measured RSSI is smaller than the minimum value or the recently measured SNR is smaller than the minimum value, the mobile terminal proceeds to step 113. If the recent RSSI and SNR are smaller than a preset minimum value, i.e., MIN_RX_RSSI and MIN_RX_SNR, the mobile terminal attempts to predict an impending deterioration of service by observing a negative slope or downward trend of past MAX_SAMPLE_SIZE samples. If any of the three checks returns a TRUE result, the mobile terminal proceeds to step 113 without performing battery saving in a manner that skips the paging message. In performing the operation of step 110, if the latest RSSI and the latest SNR are less than MIN_RX_RSSI and MIN_RX_SNR, or if a negative slope or a declining trend of past MAX_SAMPLE_SIZE samples is confirmed, the mobile terminal is roaming in a sub-optimal signal region. Indicates. However, if the latest RSSI and the latest SNR are greater than MIN_RX_RSSI and MIN_RX_SNR, and no negative slope or fall of past MAX_SAMPLE_SIZE samples is confirmed, the mobile terminal proceeds to step 111.

In step 111, the mobile terminal indicates that battery saving may be performed by skipping a valid paging message. In the condition checking step, the mobile terminal performs a deterministic checking to ensure that no more paging is skipped than required according to the paging skipping range {0,3} illustrated in this embodiment. Therefore, the mobile terminal checks whether the skip attempt count skip_attempts has obtained a value equal to or greater than the actual skip count ACTUAL_SKIP_FACTOR value selected in step 103. Currently, the skip_attempts is initialized to 0 in step 103. Accordingly, since skip_attempts (0) is smaller than ACTUAL_SKIP_FACTOR (1 selected in this example), the mobile terminal proceeds to step 112. In step 112, the mobile terminal updates skip_attempts by 1, increases the number of skipped valid paging messages by 1, and then proceeds to step 108. As such, the mobile terminal saves battery by skipping valid paging messages.

In step 108, the mobile terminal waits for generation of the next valid paging message, and proceeds to step 109 to confirm the existence of a valid paging channel block. The determination of the check will be the same as before because the storage array was not updated due to the call skip procedure. Therefore, the mobile terminal proceeds to step 111 and proceeds to checking skip_attempts for ACTUAL_SKIP_FACTOR. However, at this time, the mobile terminal can confirm that both skip_attempts and ACTUAL_SKIP_FACTOR acquire the same value of "1". Therefore, the mobile terminal proceeds to step 113.

In step 113, the mobile terminal performs the same operation as in step 106. The mobile terminal reads a paging message from the paging channel. At this time, it is assumed that there is no incoming-call notification according to an embodiment of the present invention. The mobile terminal pre-filled the MAX_SAMPLE_SIZE locations in the storage array with past values. Therefore, the mobile terminal discards the oldest samples, i.e., Array [0] .RSSI and Array [0] .SNR values, and moves the entire array to the left so that Array [MAX_SAMPLE_SIZE-1} .RSSI and Array [MAX_SAMPLE_SIZE-1] Using .SNR, store the latest sample, i.e. (MAX_SAMPLE_SIZE + 1), in the array. The latest stored sample is used to update the LAST_RX_RSSI and LAST_RX_SNR variables. At this time, the state of the array of the memory unit 96 indicates that the latest entry belongs to the sixth measured sample as follows.

Array [0]. RSSI = RSSI of the second measured sample.

Array [0]. SNR = SNR of the second measured sample.

Array [1]. RSSI = RSSI of the third measured sample.

Array [1]. SNR = SNR of the third measured sample.

Array [2]. RSSI = RSSI of the fourth measured sample.

Array [2]. SNR = SNR of the fourth measured sample.

Array [3]. RSSI = RSSI of the fifth measured sample.

Array [3]. SNR = SNR of the fifth measured sample.

Array [4]. RSSI = RSSI of the sixth / most recent / recent sample.

Array [4]. SNR = SNR of the sixth / most recent / most recently measured sample.

Finally, if the variable skip_attempts is not zero in this step, the variable is reset to zero. In a recent paging-skip procedure, the variable skip_attempt obtains the value "1". Reset the variable to 0 to reuse the variable on the next paging-skip attempt. As soon as all the actions are performed, the mobile terminal proceeds to step 108 and waits for generation of the next valid paging message.

When the next valid paging message occurs, the mobile terminal proceeds to step 110 through steps 108 and 109. If one of the three test results is a TURE result in step 110, the mobile terminal stops any attempt to save battery by skipping a valid paging message and proceeds to step 113. In this state, the mobile terminal reads the paging message and discards the oldest sample in the array. Then move the entire array to the left and update the latest element of the array with the received values. Since the skip_attemts has already been reset to "0", the mobile terminal does not update the variable.

Having described the control sequence as a whole, the following describes a sample procedure for determining a negative slope or declining tendency. The SNR values of the past five samples are as follows:

Array [0]. SNR = 7X

Array [1]. SNR = 8X

Array [2]. SNR = 7X

Array [3]. SNR = 6X

Array [4]. SNR = 5X,

Where X is a proliferation constant of appropriate size. As is known in the art, the appropriate size of 'X' is "dBm (milliseconds)". If MINS_RX_SNR is fixed at 3X, even though each LAST_RX_SNR comparison value for MIN_RX_SNR shows a FALSE result, the data shows a constant negative trend or a constant negative trend of the last four samples. Similar arguments can be extended to RSSI values present in the array. The present invention is not limited to the above array analysis as mentioned above. Those skilled in the art can adopt other methods of determining the trend without departing from the essential features of the present invention.

It is understood in the art that other methods and apparatuses may be derived by combining various methods and apparatuses of the present invention as disclosed in the description and drawings of the present invention, and that such methods and apparatuses fall within the scope of the present invention. It will be obvious to one with ordinary knowledge. In addition, description of the said combination example and a modification is abbreviate | omitted. It should also be appreciated that the host storing the application includes, but is not limited to, a microchip, microprocessor, portable communication device, computer, rendering device or multifunction device.

Although the invention has been described in detail with reference to the accompanying drawings, preferred embodiments of the invention, those of ordinary skill in the art without departing from the scope of the invention claimed in the claims It will be understood that various modifications and improvements can be made to the invention.

Glossary of Terms

DRX: Discontinuous reception. With the technology adopted in the GSM wireless communication system, it is possible to separate each mobile terminal user into a predetermined group including some other mobile terminal users. The network sends paging information to all users of the group, not specific users. The mobile terminals do not need to receive all of the generated paging channel information blocks, but instead only the mobile terminals assigned to the group receive the information blocks.

TDMA: Time Division Multiple Access. This is an access technology that divides a single radio frequency into time units and provides each slice or slot to a particular user. In GSM, the division amount is eight, which allows eight users to be carried on a single radio frequency carrier. In GSM, the slot period is 577 microseconds, and the total frame period of eight slots is 4.616 milliseconds.

PCH: Paging Channel. All call-call notifications of the paging message transmitted in the form of information blocks included in the logical paging channel are transmitted.

CCCH: common control channel. In a set of logical channels, it carries information common to all mobile terminals in use. Typically, system information, paging information, and the like are transmitted on the channel set.

BTS: base transceiver station. It transmits a radio frequency carrier that enables wireless communication.

BSC: base station controller. Manage a group of BTS units within a given area.

NW: fixed network. It includes the BTS, BSC, MSC, and all the other elements that make up a wireless communication system.

MAX_PAGE_REPEAT_FACTOR: The number of times the network sends an incoming-call notification within the paging message for a particular mobile terminal before giving up.

MO / MT: Move-out call. The MT-call is successful if the mobile terminal successfully receives the specified acknowledgment message on its paging channel.

SCI: Slot cycle index. Used in systems based on CDMA. The network has one or more logical paging channels. The SCI determines, from the plurality of paging channels, whether the plurality of paging channels have a paging message assigned to a particular mobile terminal.

BS_PA_MFRMS: Used in GSM based system. This variable takes a value from 2 to 9 and determines the period of the appropriate paging message for a particular mobile terminal in the system.

MAX_PAGE_SKIP_ATTEMPT: This variable indicates the maximum number of adjacent paging messages that the mobile terminal can skip without compromising MT-call performance.

ACTUAL_SKIP_FACTOR: This variable indicates the actual number of neighbor paging messages that the mobile terminal can skip to save battery. The value of this variable should be in the range of {0, MAX_PAGE_SKIP_ATTEMPT}.

DIV: Mathematical preparation of two operands. The result is represented by the integer form which abbreviate | omitted.

The present invention can save the battery in the standby mode without compromising the MT-call performance of the mobile terminal.

In addition, the present invention allows the mobile terminal to continuously save the battery, to incrementally increase the standby time over a time period without user intervention, and does not require a specific time-interval dependent optimization. In addition, the present invention can save battery based on the network in the idle mode, can be standardized to the existing protocol specifications. In addition, the present invention enables the battery life of the mobile terminal to be more than doubled without missing the MT-call once due to the deterministic and adaptive characteristics of the algorithm.

Claims (21)

In the method of extending the battery standby time of the mobile terminal, Setting the actual number of skips to a number less than the maximum number of paging iterations of a valid paging message determined by a paging cycle variable; If the wireless environment condition satisfies a predetermined condition, skipping reception of the valid paging message by the actual number of skips, and setting a battery saving mode while not receiving the valid paging message. Way. The method of claim 1, further comprising: counting the number of received skips of the valid paging message and storing the number of skipping attempts. The method according to claim 2, wherein if the number of skipping attempts is equal to the actual number of skips when the wireless environment state satisfies a predetermined criterion, the battery saving mode is canceled and the valid message is received at the time of receiving the valid message. And resetting the number of skipping attempts to zero. 4. The method of claim 3, further comprising: canceling the battery saving mode and receiving and processing the valid message when the wireless environment state does not satisfy a predetermined condition. Way. 5. The method of claim 4, wherein the maximum number of repetitive paging repetitions is a number of times that a network notifies an incoming call generated by the mobile terminal, and is calculated by Equation 1 below. [Equation 1] MAX_PAGE_REPEAT_FACTOR = [(90 DIV BS_PA_MFRMS) DIV 4] MAX_PAGE_REPEAT_FACTOR: Maximum number of paging repetitions BS_PA_MFRMS: Paging Cycle Variable The method of claim 5, wherein the maximum number of paging skipping attempts indicating the maximum number of valid paging messages that can be skipped within a range of not missing an incoming call is calculated as in Equation 2 below, and the actual number of skips is ACTUAL_SKIP_FACTOR (actual skip count) = 6. An extension method characterized in that one of the sets defined by {0, MAX_PAGE_SKIP_ATTEMPT}.  [Equation 2] MAX_PAGE_SKIP_ATTEMPT = MAX_PAGE_REPEAT_FACTOR-1 MAX_PAGE_SKIP_ATTEMPT: Maximum Paging Skip Attempts The wireless environment state includes a receiving RSSI and a receiving SNR, and the predetermined condition is a case where each of the most recently measured receiving RSSI and SNR is equal to or greater than a predetermined minimum receiving RSSI and a minimum receiving SNR. How to extend. 8. The method of claim 7, wherein the received RSSI and the received SNR are periodically measured, the measured received RSSI and the received SNR are stored for a predetermined period, and the predetermined condition measures the stored received RSSI and the received SNR. Extension method characterized in that the comparison result in order is not a downward characteristic. 9. The method of claim 8, wherein the measured received RSSI and the received SNR are stored at a predetermined data size upon storage. In the method of extending the battery standby time of the mobile terminal, Obtaining and storing system information received from a network; Calculating a maximum number of paging repetitions, a maximum number of paging skipping attempts, an actual number of skipping, and initializing a maximum sample size, a minimum received RSSI, a minimum received SNR, and a number of skipped attempts; By using the paging period variable included in the system information to determine the reception period of the valid paging message, until the predetermined number of samples are stored, the battery saving mode is performed at a time when the valid paging message is not received Receives a valid paging message at the time of receiving a valid paging message, detects RSSI and SNR, stores the sample according to the maximum sample size, and stores RSSI and SNR received at the time of receiving the most recent valid paging message. A second process of storing as SNR, After performing the second process and before a next valid paging message is received, comparing the latest received RSSI with the minimum received RSSI, comparing the latest received SNR with the minimum received SNR, and checking a tendency of the latest samples. 3 courses, If the recent received RSSI and the latest received SNR are greater than the minimum received RSSI and the minimum received SNR, are not prone to skipping, and the skip attempts are less than the actual skip count, maintain the battery saving mode and the next valid paging message. Skipping and increasing the number of skipping attempts by one. 11. The method of claim 10, wherein the step 4 cancels the battery saving mode if the number of skip attempts is equal to or greater than the actual number of skips, receives and processes the next valid paging message, and updates the most recently received RSSI and the most recently received SNR. And resetting the number of skipping attempts to zero. 12. The method of claim 11, further comprising: canceling the battery saving mode, receiving and processing the next valid paging message when the latest received RSSI is smaller than the minimum received RSSI, and updating the latest received RSSI and the latest received SNR. Extension method characterized in that it further comprises. 13. The method of claim 12, further comprising: receiving and processing the next valid paging message if the latest received SNR is less than the minimum received SNR, and updating the latest received RSSI and the latest received SNR. Extension method. 15. The method of claim 13, further comprising: a seventh step of releasing the battery saving mode, receiving and processing the valid paging message, and updating the latest received RSSI and the latest received SNR, if the trend tends to be lowered. Extension method. 15. The method of claim 14, wherein the maximum number of paging repetitions is a number of times that the network notifies an incoming call that has occurred to the mobile terminal, and is calculated by Equation 1 below. [Equation 1] MAX_PAGE_REPEAT_FACTOR = [(90 DIV BS_PA_MFRMS) DIV 4] MAX_PAGE_REPEAT_FACTOR: Maximum number of paging repetitions BS_PA_MFRMS: Paging Cycle Variable 16. The method of claim 15, wherein the maximum number of skipping paging attempts indicates a maximum number of valid paging messages that can be skipped within a range not to miss an incoming call, and is calculated as in Equation 2 below. [Equation 2] MAX_PAGE_SKIP_ATTEMPT = MAX_PAGE_REPEAT_FACTOR-1 MAX_PAGE_SKIP_ATTEMPT: Maximum Paging Skip Attempts 17. The method of claim 16, wherein the actual number of skips is one of a set determined by ACTUAL_SKIP_FACTOR = {0, MAX_PAGE_SKIP_ATTEMPT}. 18. The method of claim 17, wherein the maximum sample size indicates a size of a sample consisting of the received RSSI and the received SRN. 19. The method of claim 18, wherein the battery saving mode is a mode for shutting off power applied to the radio frequency unit, the central processing unit, and the digital signal processor of the mobile terminal. 20. The method as claimed in claim 19, further comprising an eighth step of performing a designated connection with the network if the received paging message includes a call notification message. 21. The method of claim 20, wherein when the sample is stored, the longest stored sample is deleted.

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