JPH04304721A - Incoming call control method and mobile station device for mobile communication system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for incoming calls in mobile communications, and more particularly to a control system that allows efficient battery saving.

0002

2. Description of the Related Art In mobile communication systems, a base station transmits incoming call information to a plurality of mobile stations via a paging control channel (hereinafter also referred to as PCH). The mobile station receives the PCH during standby and knows whether there is an incoming call. At this time, the mobile station performs intermittent reception of PCH for the purpose of battery saving by reducing power consumption. Intermittent reception means that mobile stations are divided into groups, and the base station uses PCH.
In this method, incoming call information is transmitted in slots for each group, and the mobile station is in a receiving state only in the slots in which common information and incoming call information for its own group are being transmitted. Reception operation time T of intermittent reception method versus reception operation time TA of continuous reception method
The ratio TB/TA of B is called the intermittent ratio.

FIG. 7 is a diagram showing the PCH signal structure and the reception operation timing of a mobile station in a conventional system. In the figure, the number 40 written inside the PCH represents common information of the PCH, and 411 to 418 represent incoming call information for groups 1 to 8. As shown in the figure, the PCH repeatedly transmits one common information and eight groups of incoming call information divided in time, and the mobile station receives the common information and the information of the group to which it belongs. Reception is possible only during certain hours. As a result, the intermittent reception method can reduce reception operation time and power consumption compared to the continuous reception method.

0004

SUMMARY OF THE INVENTION The above-mentioned intermittency ratio greatly affects the incoming connection delay and power consumption of the mobile station. That is, the smaller the intermittent ratio is, the more power consumption of the battery can be reduced and effective battery saving can be achieved, but in this case, the incoming connection delay becomes longer and serviceability deteriorates. In conventional incoming connection control methods, the intermittency ratio is always constant, so if the intermittency ratio is set to a large value in order to keep the incoming connection delay time short, power consumption increases and the receiver's operating time (standby time) becomes shorter. There was a drawback. On the other hand, if the intermittent ratio is set to a small value in an attempt to lengthen the available standby time, the incoming call connection control time increases and serviceability deteriorates. In order to solve these conventional problems, it is an object of the present invention to provide a call termination control method that allows a mobile station to stand by for a long time without impairing serviceability.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In other words, the invention of claim 1 comprises a plurality of base stations and a plurality of mobile stations that communicate with each base station via radio, and the incoming signals to the mobile stations are temporally grouped incoming calls. In an incoming call control method for a mobile communication system, in which the mobile station intermittently receives only the incoming control channel of the group to which it belongs, which is transmitted from the base station through a control channel, the mobile station detects the remaining power in its own battery. Based on the measured value of the remaining power of the battery, the mobile station determines a slot in which the mobile station intermittently receives the incoming control signal, transmits the measured value or information regarding the slot in which the incoming control signal is intermittently received to the base station, At the station,
An incoming call control method for a mobile communication system that determines a slot for transmitting an incoming control signal based on information notified from a mobile station,

[0006] The invention of claim 2 is a mobile station device of a mobile communication system that intermittently receives only the incoming control channel of a group to which its own station belongs, which includes a battery and a remaining power or remaining power of the battery. A mobile device comprising means for measuring a value, means for determining and receiving a slot of an incoming control signal that the mobile station intermittently receives based on the measured value, and means for transmitting information regarding the measured value or the slot to a base station. It is a station device.

[0007]

[Operation] According to the invention as claimed in claim 1, a mobile station is provided with a remaining battery capacity measuring circuit, and based on the measurement result, the mobile station determines the slot in which it receives intermittently, and transmits this information to the base station. It acts to transmit an incoming call control signal to the mobile station based on the information, and is characterized by changing the intermittent ratio depending on the remaining battery power for each mobile station, and for all mobile stations, The difference from the conventional system in which the intermittency ratio is always the same is that the intermittency ratio is changed for each mobile station. Furthermore, the invention of claim 2 relates to the configuration of a mobile station for realizing the incoming call control method of claim 1, and acts as if the mobile station performs its own operation in the above-mentioned control.

[0008]

Embodiment FIG. 1 is a block diagram showing the configuration of a mobile station according to an embodiment of the present invention. The mobile station shown in the figure includes a battery 11 that supplies power to the mobile station, a battery remaining power measuring circuit 12 that measures the remaining power of the battery 11, and a battery remaining power measuring circuit 12 that measures the remaining power measurement value into a four-step threshold value. A transmitter control circuit 1 that controls the operation of the information processing circuit 13 and the transmitter 15 and instructs when to measure remaining battery power.
4. Transmission section 15 including functions such as multiplexing, encoding, and modulation of transmission information, and transmitting/receiving distributor 1 distributing transmission signals and reception signals.
6, an antenna 17 that transmits and receives signals, a receiving section 18 that includes functions such as decoding and demodulating received signals, and a receiving section control circuit 19 that controls receiving operations.

In the figure, during standby, the transmitter control circuit 14 causes the remaining battery power measuring circuit 12 to measure the remaining power of the battery 11 at regular time intervals, and sends the measured value to the remaining battery power information processing circuit 13. . The remaining battery power information processing circuit 13 is set with four threshold values Ti (i=0 to 3) and respective threshold identification numbers Ni (i=0 to 3) for the remaining battery power. Then, the maximum threshold value that does not exceed the measured value and the corresponding threshold identification number are determined. The determined threshold identification number is sent to the transmitter 15 along with information to other base stations.
It is multiplexed, encoded, and modulated to become a transmission signal to the base station, and then passes through the transmission/reception distributor 16 to the antenna 1.
Sent from 7.

[0010] In this embodiment, the processing steps in the mobile communication network after the mobile station sends remaining battery power information to the base station will be explained. FIG. 2 is a diagram showing an example of the configuration of a mobile communication network implementing the present invention. Mobile communication network is mobile station 201
~203, base station 2 including a communication means for communicating with a mobile device
11 to 213 and its wireless zones 261 to 263
, a control station 22 including configuration means for configuring the PCH sent out within the paging area, and a switching center 23 including connection means for connecting incoming signals from other mobile networks or general telephone networks.
, and a home memory 24 including storage means for storing data regarding the mobile stations 201 to 203.

FIG. 3 is a diagram showing an example of the signal structure of the PCH in this embodiment. As shown in the figure, the PCH is composed of hyperframes indicated by the number 31, and each hyperframe is composed of four superframes 321 to 324. Each superframe has a common information part 331
334 and an incoming call information part 34, and a frame number Fj (j=0 to 3) for identifying the four superframes is added to the common information parts 331 to 334. The incoming call information section 34 contains incoming call information 351 for groups 1 to 8.
~358.

Table 1 shows the remaining battery power information processing circuit 1.
3 is a table showing the correspondence between the threshold identification number determined in step 3 and the frame number of the superframe in which the receiving operation is performed.

[Table 1]

The base stations 211 to 213 that have received the transmission signal containing the threshold identification number determined by the remaining battery power information processing circuit 13 access the home memory 24 through the control station 22 and the switching station 23, and
The threshold identification number is written in the individual data of the mobile stations 201 to 203 above. Furthermore, base stations 211 to 21
3 confirms that the threshold identification number has been written into the home memory 24, then adds writing completion information to the downlink signal to the mobile station 20 and sends it to the mobile stations 201-203. When the mobile stations 201 to 203 receive this signal, the receiving section 18 demodulates and decodes it, and sends the contents to the receiving section control circuit 19. The reception unit control circuit 19 changes its operation to receive the incoming information in the super frame 32 having the frame number according to Table 1 based on the threshold identification number of the remaining battery power. As a result, the number of superframes 32 received within a hyperframe 31 can be changed according to the threshold identification number, so that the intermittent ratio can be changed according to the remaining battery power during standby.

Next, the incoming call control using the intermittent reception method in this embodiment will be explained. When an incoming signal arrives at the switching center 23 from the general telephone network (PSTN) or other mobile network, the mobile station 20 to be called is stored in the home memory 24.
1 to 203 are read together with the threshold identification number representing remaining battery power information, and these information are notified to the control station 22 which has the mobile station to be called under its control. Based on the received threshold identification number, the control station 22 inserts the information of the mobile station to be called into the incoming call information part of the superframe 32 having the frame number according to Table 1, and sends the information to the PC.
H is configured and transmits incoming call information through base stations 211 to 213. Since the mobile stations 201 to 203 are already performing reception operations at the same intermittent reception timing, they can receive incoming call information without missing it. As described above, the mobile stations 201 to 203 can perform a call receiving operation by changing the intermittent ratio according to the remaining battery power.

FIG. 4 is a graph showing the relationship between the remaining power of the battery and the operating time of the mobile device in the present invention and the conventional method. Here, the total capacity of the battery is Q, the operating limit time in the conventional method is T, the four thresholds of remaining battery power are Q/2, Q/4, Q/8, and 0, and the standby time and call It is assumed that the time ratio is constant and the power consumption is constant over time. The broken line is the conventional method, and the solid line is the time change in the remaining battery power of the present method. The remaining power decreases as the operating time passes, but the battery's power consumption changes each time the remaining battery power passes a threshold, extending the battery life. As a result, the battery life of this method can be extended approximately 1.6 times compared to the conventional method. In this embodiment, the threshold value determined by the remaining battery power information processing circuit 13 is set to four levels, but by providing more threshold values, finer control of incoming calls can be performed. Furthermore, although the hyperframe 31 is configured with four superframes 32 and the incoming call information portion is divided into eight groups, values can be set according to the required incoming connection delay time and standby time.

Next, in an embodiment of the present invention, a case where the intermittent ratio changing process is performed at the end of a call will be described. Since the mobile stations 201 to 203 consume more power during a call than when in standby, the mobile stations 201 to 2
There is a great need to check the remaining battery power of the 03. Therefore, when the mobile station ends the call, the transmitter control circuit 14 instructs the remaining battery power measuring circuit 12 to measure when the call ends. Based on this measured value, the remaining battery power information processing circuit 13 determines a threshold identification number, adds this to the call termination signal in the transmitting section, and transmits it to the base stations 211 to 213.
Send to. When the call is terminated from the network side, when the mobile stations 201 to 203 receive the call termination signal and recognize the termination of the call, the transmitter control circuit 14 activates the remaining battery power measuring circuit 1.
Instruct step 2 to measure. Based on this measured value, the battery remaining power information processing circuit 13 determines a threshold identification number,
The transmitter 15 adds this to the response signal of the call termination signal and transmits it to the base stations 211 to 213. Base stations 211-2
The processing after the notification of the threshold identification number to No. 13 is the same as that described above. In the method of performing the intermittent ratio change process at the end of a call, since the remaining battery power changes greatly during a call, the intermittent ratio change process can be performed in a timely manner according to the remaining battery power. Furthermore, since the number of control signals is the same as in the conventional method, there is an advantage that the burden on the base station and mobile station is not large.

Further, in an embodiment of the present invention, a case where the intermittent ratio changing process is performed at the time of location registration of a mobile device will be explained. When the mobile stations 201 to 203 move from one paging area to another, they transmit a location registration request signal to the base station 21 in order to rewrite the contents of the home memory 24. Therefore, when moving to a simultaneous paging area, the transmitter control circuit 14
instructs the remaining battery power measuring circuit 12 to perform measurement. Based on this measured value, the remaining battery power information processing circuit 1
3 determines the threshold identification number, adds it to the location registration request signal in the transmitter, and transmits it to the base stations 211 to 213. The processing after notifying the remaining power information to the base stations 211 to 213 is the same as described above. According to this method, when the mobile station frequently moves from one location registration area to another, there are more opportunities to measure the remaining battery power, and the intermittency ratio can be set more precisely. Also, since the number of control signals does not change, there is an advantage that the burden on the base station and mobile station does not increase.

The configuration and measuring method of the remaining battery power measuring circuit 12 used in the embodiment of the present invention will be explained below. FIG. 5 is a diagram showing the configuration of the remaining battery power measuring circuit 12 in the present invention. The remaining battery power measuring circuit 12 includes a battery voltage measuring circuit 51 that measures the battery voltage, and a remaining battery power determining circuit 52 that determines the remaining battery power from the measured battery voltage. Here, a case will be described in which a lithium battery whose battery voltage monotonically decreases as the remaining battery power decreases is used as the power source battery. FIG. 6 is a graph showing the correspondence between the remaining battery power and the battery voltage in a lithium battery, and the battery remaining power determination circuit 52 includes this correspondence information. When the transmitter control circuit 14 notifies the battery remaining power measurement command, the battery voltage measuring circuit 51 measures the battery voltage and notifies the battery remaining power determining circuit 52 of the measurement result. Battery remaining power determination circuit 5
2 determines and outputs the remaining battery power corresponding to the measured voltage value according to the correspondence information between the battery voltage and the remaining battery power. As described above, the remaining battery power measuring circuit 12 measures the remaining battery power. Here, some people think that the voltage drop due to the internal resistance of the battery may have a negative effect on battery voltage measurement, but in the present invention, the remaining power of the battery is measured during standby when the power consumption is low and the amount of current flowing is small. Therefore, the voltage drop due to the internal resistance of the battery is very small and its effect can be ignored.

[0019]

As explained above, in the present invention, the intermittency ratio of reception control channel reception is changed according to the remaining battery power of the mobile station, so that the incoming call control allows for long-term standby without impairing serviceability. method can be realized. Mobile stations with sufficient remaining battery power can shorten incoming connection delays, thereby improving serviceability. Furthermore, even when the mobile station is used for a long time or when the opportunity to charge the battery is missed and the remaining battery power is low, there is an advantage that the standby time of the mobile station can be extended compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a mobile station according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of the configuration of a mobile communication network implementing the present invention.

FIG. 3 is a diagram showing an example of a signal configuration of PCH.

FIG. 4 is a graph showing the relationship between the remaining power of the battery and the operating time of the mobile device.

FIG. 5 is a diagram showing the configuration of a battery remaining power measuring circuit.

FIG. 6 is a graph showing the correspondence between remaining power and voltage of a lithium battery.

FIG. 7 is a diagram showing a conventional PCH signal structure and reception operation timing of a mobile station.

[Explanation of symbols]

11 Battery 12 Battery remaining power measurement circuit 13
Battery remaining power information processing circuit 14 Transmitting unit control circuit 15 Transmitting unit 16 Transmitting/receiving distributor 17 Antenna 18 Receiving unit 19 Receiving unit control circuit 201 to 203 Mobile stations 211 to 213 Base station 22 Control station 23 Switching station 24 Home memory 25 Simultaneous paging Areas 261 to 263 Wireless zone 31 Hyper frame 321 to 324 Super frame 331
~334 Common information section 34 Incoming call information section 351 ~358 Incoming call information 51 Battery voltage measurement circuit

Claims (2)

[Claims] Claim 1: Consisting of a plurality of base stations and a plurality of mobile stations that communicate with each base station via radio, incoming signals to the mobile stations are sent to the base stations through incoming control channels that are grouped in time. In an incoming call control method for a mobile communication system in which the mobile station intermittently receives only the incoming control channel of the group to which the mobile station belongs, the mobile station measures the remaining power of its own battery; The mobile station determines a slot for intermittently receiving incoming control signals based on the measured value of the remaining power of the battery, transmits the measured value or information regarding the intermittently receiving slot to the base station, and the base station 1. A call termination control method for a mobile communication system, comprising determining a slot for transmitting a termination control signal based on information notified from a station. 2. In a mobile station device of a mobile communication system that intermittently receives only an incoming control channel of a group to which the own station belongs, means for measuring a battery and a remaining power of the battery or a value corresponding to the remaining power. A mobile device characterized by comprising: a means for determining and receiving a slot of an incoming control signal that the mobile station intermittently receives from the measured value; and a means for transmitting information regarding the measured value or the slot to a base station. station equipment.