JP2005167749A - Radio communication device and data search method for control - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication device and a data search method for control which can suppress a consumption current when the device is placed outside of the base station. <P>SOLUTION: The device is provided with a radio part 101, a 1st counter part 108 which measures time duration to receive data for control of the base station, a 2nd counter 109 which measures a space between receiving of the data for control of the base station, and a control part 120 which controls the whole. Th control part 120 controls the radio part 101 to receive the data for control only time decided by the 1st counter part 108 during to catch the data for control transmitted by the base station. If it is not possible to receive the data for control, the control part 120 controls the radio part 101 to again receive the data for control only during time decided by the 1st counter part 108 in a time interval decided by the 2nd counter part 109. If the control part 120 can not receive the data for control of the base station and repeats receiving, time measured by the 1st counter part 108 is made short. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a TDMA wireless communication apparatus that performs communication using wireless signals and a control data search method for searching for control data from a base station.

  In a TDMA wireless communication device, a control signal (hereinafter also referred to as “control signal” or “control data”) is periodically transmitted from a base station side in a specific slot, and a standby wireless communication device Many devices that receive a control slot transmitted by a base station and operate to wait for a call from the base station have been put into practical use.

For example, in PHS, a base station transmits a control signal at a cycle of 100 msec, and a PHS terminal in a standby state transmits a control signal corresponding to an incoming call group determined by a telephone number of the PHS terminal among control signals transmitted by the base station. It receives and waits for a call from the base station (see Non-Patent Document 1). In the PHS terminal, when shifting from a call state to a standby state for receiving a control signal, or when starting reception of a control signal of a new base station due to a deterioration in the reception state of a control signal being standby, the reception frequency is set to When continuous reception is performed in accordance with the transmission frequency of the control signal of the base station and the control signal of the base station is captured, the operation shifts to an intermittent reception operation corresponding to the transmission cycle of the control signal and shifts to a standby state. In a mobile wireless communication device such as a PHS terminal that is almost battery-powered, in order to prevent battery consumption, if a base station control signal cannot be received by continuous reception for a certain period of time, reception is stopped to some extent. After the time elapses, continuous search is performed again, and the search for the control signal of the base station is continued while repeating the operation of trying to receive the control signal of the base station. In this way, when there is a wireless communication device in an environment where the base station cannot capture and operates to repeat continuous reception and reception suspension for base station search, the reception time is shortened from the viewpoint of current consumption, and the suspension time is reduced. On the other hand, if the pause period is long, continuous reception for the next base station search is activated even when the wireless communication device returns to the place where it can receive the control signal of the base station. Until this time, it will be out of service area, so the pause time cannot be made too long. In order to solve this problem, immediately after the start of acquisition of the base station, the pause time when the base station cannot be acquired by continuous reception is shortened, and continuous reception and reception pause are repeated. A control method has been proposed in which the control is switched so as to lengthen the time of the reception, or when the continuous reception and the reception pause are repeated, the reception pause time is gradually increased (see Patent Document 1).
JP 2000-69552 A Second Generation Cordless Telephone System Standard 4.0th Edition Chapter 4 (Representative Figure Page 70 Figure 4.4.4)

  As described above, in the conventional example, the base station search is repeated in an environment in which the base station cannot receive, and in order to prevent an increase in current consumption, when the reception and pause for the base station search are repeated, the pause period is interrupted. Since the base station was not able to receive for a long time, even if it moved to an environment where the base station can receive, the start of the next base station search will be delayed, There was a problem that the return to the standby state might be delayed.

In addition, when repeating reception and pause for base station search, the pause period was extended from the middle or sequentially increased, so the base station search start cycle is not constant, It was difficult to share timer control with other timer controls. In a wireless communication device for battery-driven mobile communication devices such as PHS, in order to suppress current consumption during standby as much as possible,
When the base station is not searched or communicated, that is, when the radio unit is in a stopped state, a method of stopping the CPU that controls the apparatus is used. One of the triggers for the CPU to return from the stopped state to the activated state is due to the expiration of the timer. Prior to the control due to the expiration of the timer, such as the control for searching for the base station, the CPU shifts from the suspended state to the activated state. Each time the OS process for returning the CPU to the operating state is executed. Therefore, for example, when two controls such as searching for a base station and updating of a battery remaining amount counter are performed during a certain period of time, when each control is individually activated by starting a timer, an OS for the CPU to return to the operating state However, if both processes are performed with a single timer start-up, only one OS process is required for the CPU to return to the operating state, so both processes can be performed with a single timer start-up. The current consumption of the CPU can be reduced and the load on the CPU can be reduced. Therefore, when the base station search cycle is not constant, it is difficult to share the timer control with the control that is started at another constant cycle, and the device that reduces the current consumption by stopping the CPU as described above However, there is a problem that current consumption increases and CPU load increases. In this wireless communication apparatus and control data search method, it is required to suppress current consumption when the mobile station is out of the base station.

  The present invention provides a wireless communication apparatus capable of suppressing current consumption when the base station is out of service area and a control data search method for suppressing current consumption when the base station is out of service area. The purpose is to do.

  In order to solve the above problems, a wireless communication apparatus of the present invention is a wireless communication apparatus that communicates with a base station that transmits control data and receives control data of the base station during standby, and that receives a radio signal. A first counting unit that counts the time for receiving control data periodically transmitted by the base station, and a first counter that counts the interval for receiving control data periodically transmitted by the base station. 2 and a control unit that controls the whole, and the control unit transmits the radio unit to the base station for a time determined by the first counting unit in order to capture control data transmitted by the base station. If the control data is not received, and the control data is not received, the radio unit is again set for the time determined by the first counter at the time interval determined by the second counter. Control to receive base station control data When repeating the receiving the control data of the base station can not be received, it has a structure to shorten the time measured by the first counter.

  Thereby, the radio | wireless communication apparatus which can suppress the consumption current when it puts out of the range of a base station is obtained.

  In order to solve the above problems, the control data search method of the present invention communicates with a base station that transmits control data, and is transmitted from the base station in a wireless communication device that receives control data of the base station during standby. A control data search method for searching for control data, wherein a search time determining step for determining a search time and reception for searching for a base station is performed between the search time determined in the search time determining step. A reception step, a reception stop step for stopping reception when control data for the base station cannot be received within the determined search time, a search start cycle measuring step for measuring a search start cycle, and a search time If the control data for the base station cannot be received at the end of the search period, the search time determined in the search time determination step is determined to be less than or equal to the previous search time after the search cycle expires. And a structure having a search time decreasing step to shift to the reception step Te.

  As a result, a control data search method for suppressing current consumption when the mobile station is outside the service area of the base station can be obtained.

  A wireless communication device of the present invention is a wireless communication device that communicates with a base station that transmits control data and receives control data of the base station during standby, a wireless unit that receives a radio signal, and a base A first counting unit that counts time for receiving control data periodically transmitted by the station, a second counting unit that counts intervals for receiving control data periodically transmitted by the base station, and the whole The control unit receives the control data of the base station from the radio unit for a time determined by the first counting unit in order to capture the control data transmitted by the base station. If the control data cannot be received, the wireless unit transmits the control data for the base station again at the time interval determined by the second counter unit for the time determined by the first counter unit again. Control to receive and receive base station control data. If the reception is repeated, the time counted by the first counting unit is shortened so that the time during which the current at the time of reception for base station search is consumed in an environment where the base station cannot receive is consumed. The current consumed while the base station cannot receive data can be reduced, and if a temporary base station reception error occurs at the start of the search, the search time is lengthened at the start of the search. It is possible to reduce the delay in returning to the standby state by judging that the base station could not be received, and further searching in an environment where the base station cannot receive. By repeating the search and pause while keeping the start cycle constant, the delay in returning to the standby state when the reception is possible is reduced, regardless of the duration of the state in which reception is not possible. At the same time enhance the commonality of the timer control of the control which is activated other periodically when that advantageous effect is obtained that it is possible to reduce the increase in increase and current consumption accompanying the CPU load.

  Furthermore, a wireless communication device that communicates with a base station that transmits control data and receives control data of the base station during standby, and a wireless unit that receives a radio signal and a base station periodically transmits A counting unit for counting the time for receiving control data to be transmitted and the time for stopping the radio unit when the control data periodically transmitted by the base station cannot be received, and a control unit for controlling the whole. The control unit can receive the control data by controlling the radio unit to receive the control data of the base station for the time determined by the counting unit in order to capture the control data transmitted by the base station. If not, control is performed so that the reception operation of the radio unit is stopped for the time determined by the counting unit, and after the time determined by the counting unit has elapsed, the radio unit is re-established for the time determined by the counting unit again. Will receive the control data When the control is repeated and the reception is repeated without receiving the control data of the base station, the reception time is set to be smaller than the previous reception time at least once and the ratio of the reception interval is set in the reception interval and the subsequent stop interval. By controlling the time counted by the counting unit so that it is the same as or smaller than the previous ratio, the time during which reception current is consumed for base station search in an environment where the base station cannot receive is shortened. In the environment where the base station cannot receive, the current consumed while the base station cannot receive can be reduced. By repeating the above, the delay in returning to the standby state when the reception is possible is reduced regardless of the duration of the state in which reception is not possible. In addition, if a temporary base station reception error occurs at the start of the search, control is performed to increase the search time at the start of the search, and it is determined that the base station was not received and the search is performed. An advantageous effect is obtained in that it is possible to reduce the delay in stopping and returning to the standby state.

Furthermore, a control data search method for searching for control data transmitted from a base station in a wireless communication apparatus that communicates with a base station that transmits control data and receives control data of the base station during standby. A search time determining step for determining a search time; a receiving step for receiving for searching for a base station during the search time determined in the search time determining step; and a control of the base station within the determined search time If the data for the base station cannot be received, the reception stop step for stopping the reception, the search start cycle measuring step for measuring the search start cycle, and the control data for the base station cannot be received within the search time A search time diminishing step in which the search time determined in the search time determination step is determined to be equal to or less than the previous search time after the search cycle has expired, and the process proceeds to the reception step; By having the base station, it is possible to shorten the time during which the current during reception for base station search is consumed in an environment where the base station cannot receive, and to reduce the current consumed while the base station cannot receive Also, if a temporary base station reception error occurs at the start of the search, the search time is extended at the start of the search, and it is judged that the base station could not be received and the search is stopped. In addition, the delay in returning to the standby state can be reduced, and further, in a situation where the base station cannot receive, the search start activation period is kept constant, and the search and pause are repeated, so that the reception is not possible. Regardless of the time, the delay in returning to the standby state when the reception is possible is reduced, and at the same time the timer control is shared with other periodically activated controls. Beneficial effect is obtained that it is possible to reduce the increase in increase and current consumption accompanying the CPU load.

  Furthermore, a control data search method for searching for control data transmitted from a base station in a wireless communication apparatus that communicates with a base station that transmits control data and receives control data of the base station during standby. A search time determining step for determining a search time; a receiving step for receiving for searching for a base station during the search time determined in the search time determining step; and a control of the base station within the determined search time If reception data cannot be received, the reception stop step for stopping reception and the stop time for stopping reception are determined, and the ratio of the reception time to the total of the search time and the stop time is determined as the stop time after the next time. The stop time determination step for determining to be equal to or smaller than the previous ratio, and the search time determined in the search time determination step after the stop time elapses at least once A search time diminishing step that decides a time shorter than the reception time and shifts to the reception step, thereby reducing the time during which the current during reception for base station search is consumed in an environment where the base station cannot receive It can be shortened, and the current consumed while the base station cannot receive can be reduced. At the same time, the search pause time provided for reducing the current consumption can be reduced in an environment where the base station cannot receive. By repeating the search and pause, the delay in returning to the standby state when the reception is possible can be reduced regardless of the duration of the state in which reception is not possible. If a reception error occurs in the base station, the search time is extended at the start of the search, and it is determined that the base station could not be received and the search is stopped. , Advantageous effect can be reduced that the return to the standby state is delayed is obtained.

  The present invention aims at suppressing current consumption when the base station is out of the service area, and when receiving data without repeating the control data of the base station, the reception counted by the first counting unit. Realized by shortening the time for.

A first invention made to solve the above problem is a radio communication apparatus that communicates with a base station that transmits control data and receives control data of the base station during standby, and receives radio signals. A first counting unit that counts the time for receiving control data periodically transmitted by the base station, and a first counter that counts the interval for receiving control data periodically transmitted by the base station. 2 and a control unit that controls the whole, and the control unit transmits the radio unit to the base station for a time determined by the first counting unit in order to capture control data transmitted by the base station. If the control data is not received, and the control data is not received, the radio unit is again set for the time determined by the first counter at the time interval determined by the second counter. Control to receive base station control data, When the control data of the ground station cannot be received and reception is repeated, the time counted by the first counting unit is shortened, and the base station search is performed in an environment where the base station cannot receive. The time that current is consumed at the time of receiving can be shortened, the current consumed while the base station cannot receive can be reduced, and a temporary base station reception error occurs at the start of search If this is the case, the search time is controlled to be longer at the start of the search, and it is determined that the base station could not be received, the search is stopped, and the delay in returning to the standby state can be reduced, Furthermore, by repeating the search and pause while keeping the search start activation period constant in an environment where the base station cannot receive, it waits when it becomes ready for reception regardless of the duration of the state where reception is not possible. An effect that the delay in returning to the receiving state can be reduced, and at the same time the timer control can be shared with other periodically activated controls, and the increase in CPU load and the accompanying increase in current consumption can be reduced. Has an effect.

  A second invention made to solve the above problem is a radio communication apparatus that communicates with a base station that transmits control data and receives control data of the base station during standby, and receives radio signals. And the time for receiving control data periodically transmitted by the base station and the time for stopping the radio unit when the control data periodically transmitted by the base station cannot be received. The control unit has a counting unit and a control unit that controls the whole, and the control unit receives the control data of the base station from the radio unit for a time determined by the counting unit in order to capture the control data transmitted by the base station. If control data is not received and control data cannot be received, control is performed such that the reception operation of the wireless unit is stopped for the time determined by the counting unit, and again after the time determined by the counting unit has elapsed. No time determined by the counting unit If the unit repeats control to receive base station control data and repeats reception without receiving base station control data, the reception time is set to be smaller than the previous reception time and received at least once. The time measured by the counting unit is controlled so that the ratio of the reception section in the section and the subsequent stop section is the same as or smaller than the previous ratio. For this reason, it is possible to shorten the time during which the current during reception is consumed, reduce the current consumed while the base station cannot receive, and at the same time reduce the current consumption in an environment where the base station cannot receive By repeating the search and pause without increasing the search pause time provided for The delay in returning to the standby state can be reduced at the same time, and if a temporary base station reception error occurs at the start of the search, control is performed to increase the search time at the start of the search. Therefore, it is determined that the base station could not be received, and the search is stopped, so that the delay in returning to the standby state can be reduced.

  A third invention made to solve the above problem is a control transmitted from a base station in a wireless communication apparatus that communicates with a base station that transmits control data and receives control data of the base station during standby. A control data search method for searching for data, a search time determining step for determining a search time, and a receiving step for receiving for searching for a base station during the search time determined in the search time determining step A reception stop step for stopping reception when the control data for the base station cannot be received within the determined search time, a search start cycle measurement step for measuring the search start cycle, and a base station within the search time. If station control data cannot be received, the search time determined in the search time determination step is determined to be less than or equal to the previous search time after the search cycle has expired. The search time diminishing step for shifting to the base station is included, and in the environment where the base station cannot receive, the time during which the current during reception for base station search is consumed can be shortened. The current consumed while the station cannot be received can be reduced, and if a temporary base station reception error occurs at the start of the search, control is performed to increase the search time at the start of the search. Therefore, it is possible to reduce the delay in returning to the standby state by judging that the base station could not be received and to make the search start activation period constant in an environment where the base station cannot receive. By repeating the search and pause, the delay in returning to the standby state when the reception is possible can be reduced at the same time as other reception, regardless of the duration of the state in which reception is not possible. Enhance sharing of timer control with a period controlled to be started, with an action and effect that it is possible to reduce the increase in increase and current consumption accompanying the CPU load.

A fourth invention made to solve the above problem is a control transmitted from a base station in a wireless communication apparatus that communicates with a base station that transmits control data and receives control data of the base station during standby. A control data search method for searching for data, a search time determining step for determining a search time, and a receiving step for receiving for searching for a base station during the search time determined in the search time determining step If the base station control data cannot be received within the determined search time, a reception stop step for stopping reception, a stop time for stopping reception, and a stop time for the next and subsequent times are determined. Stop time determination step for determining that the ratio of the reception time in the sum of the stop time and the stop time is equal to or smaller than the previous ratio, and the search time determination step after the stop time has elapsed The search time to be determined is determined at least once as a time shorter than the previous reception time, and the search time diminishing step for shifting to the reception step is included. The current consumption time for receiving for search can be shortened, the current consumed while the base station cannot receive can be reduced, and at the same time, the current consumption in an environment where the base station cannot receive By repeating the search and pause without lengthening the search pause time provided for reduction, the delay in returning to the standby state when the reception is possible, regardless of the duration of the status where reception is not possible. If a temporary base station reception error occurs at the start of the search, control is performed so that the search time is extended at the start of the search. , It is determined that has not been received base station stops searching, has an action and effect that it is possible to reduce that the return to the standby state is delayed.

(Embodiment 1)
FIG. 1 is a block diagram showing a radio communication apparatus according to Embodiment 1 of the present invention, FIG. 2 (a) is a timing diagram showing transmission timing of control data of a base station, and FIG. 2 (b) is a radio communication apparatus. FIG. 3 is a timing chart showing the reception timing in the (terminal), FIG. 3 is a timing chart showing the search timing in the wireless communication apparatus, and FIG. 4 is a flowchart showing the operation of the wireless communication apparatus in FIG.

  In FIG. 1, reference numeral 100 denotes an antenna that inputs and outputs radio signals with a base station (not shown), and 101 denotes a radio unit that modulates transmission data into radio signals to generate radio signals to be transmitted and demodulates received radio signals. , 102 adds bit synchronization data, frame synchronization data, error detection code, etc. to the transmission data to generate a data string to be transmitted in one slot of TDMA, extracts voice data and control data from the received signal, and generates an error A frame processing unit for making a determination and outputting; 103, a digital audio signal to be transmitted; and a voice processing unit for converting received audio data into an analog audio signal; 104, a microphone for inputting an audio signal; 105, an audio signal A speaker for outputting a signal, 106 an operation unit for inputting a telephone number, 107 an input telephone number, date / time, call time, wireless communication device The display unit displays the operating state of the battery, the remaining battery level, etc., 108 is a first counting unit that counts the search time when searching for the base station, and 109 is a second counting unit that counts the start cycle of the base station search , 120 is a control unit for controlling the entire apparatus.

The wireless communication apparatus shown in FIG. 1 can perform voice communication with other telephones and wireless communication apparatuses via a base station. When making a call from the wireless communication apparatus to another apparatus, the user inputs the other party's telephone number and a call key for requesting a call from the operation unit 106 to make a call. When a transmission operation is performed by the operation unit 106, the control unit 120 sends a control signal for calling the base station to the frame processing unit 102. The frame processing unit 102 receives the control signal from the control unit 120 in accordance with the reception timing of the base station. Bit synchronization data, frame synchronization data, error detection code, and the like are added to the control data and output to the radio unit 101. The data sequence output from the frame processing unit 102 is converted into a radio signal by the radio unit 101 to be an antenna. 100 is transmitted. The control unit 120 controls the radio unit 101 and the frame processing unit 102 to wait for a response from the base station, receives a response from the base station, and receives a response from the base station, and then controls for call connection. Exchange data. When the base station is notified that the other party has responded, the control unit 120 performs control to start a voice call, and the received voice signal is converted into an analog signal by the voice processing unit 103 and output from the speaker 105, The voice signal input from 104 is digitally converted by the voice processing unit 103, processed by the frame processing unit 102, converted to a radio signal by the wireless unit 101 and output, and a voice call is started. .

  When a call is made from another device to the wireless communication device in FIG. 1, the base station transmits control data for notifying the wireless communication device of the incoming call, and the wireless communication device receives the control data for notifying the incoming call. Then, the control data for the call control is exchanged with the base station in the same manner as the transmission operation described above, and the control unit 120 controls the display unit 107 to display to notify the incoming call. When an incoming call response operation is performed, control is performed to start a voice call. In the transmission operation and the reception operation, since wireless transmission / reception between the base station and the wireless communication apparatus is performed using the TDMA system, it is necessary to synchronize the transmission / reception. For this reason, the base station periodically transmits a radio signal, and the radio communication apparatus establishes TDMA frame and slot synchronization with the base station based on this signal. The synchronization signal (hereinafter referred to as “control channel”) periodically transmitted by the base station includes slot information indicating in which slot the transmission of the control channel is transmitted, and the base station transmitting. Information necessary for the wireless communication apparatus to establish synchronization of the TDMA frame and slot of the base station, such as ID information, is included. In addition, notification of incoming calls to the wireless communication device is also notified through the control channel. When making a call, the wireless communication device searches for a control channel of the base station for the purpose of selecting a base station having a good reception state among communicable base stations and makes a call to a base station with a high reception level. Implement the request. Further, the wireless communication apparatus receives a control channel in order to receive a call from the base station for receiving an incoming call when the state is not during a call.

  Next, the search operation of the control channel of the base station that is activated when the call of the wireless communication device starts, when the standby operation after the call ends, when the reception state of the control channel of the standby base station deteriorates, etc. Give an explanation.

As described above, the base station periodically transmits the control channel at a predetermined frequency. In order to receive the control channel, the control unit 120 sets the reception frequency of the wireless unit 101 so as to receive a signal of the transmission frequency of the control channel, and sets the reception state. The control channel transmitted from the base station is demodulated by the radio unit 101 via the antenna 100 and sent to the frame processing unit 102. The frame processing unit 102 extracts control data included in the control channel based on the frame synchronization data included in the demodulated data. If there is no reception error, the extracted control data is sent to the control unit 120, where the control data is analyzed, and the base station ID, slot information, and the like are extracted. Thereafter, when starting communication with the corresponding base station, the control unit 120 determines the transmission / reception timing based on the received control slot timing and slot information, and starts the communication so that the wireless unit 101 and the frame processing unit start communication. 102 and the like are controlled. When shifting to a synchronization state with the corresponding base station, the control unit 120 controls the radio unit 101, the frame processing unit 102, and the like so as to receive the control channel in accordance with the transmission cycle of the control channel of the base station. . In order to receive the control channel of the base station, the control unit 120 manages time for searching for the control channel of the base station in addition to the above control. When starting the search for the control channel, such as when the call is ended or the standby base station cannot receive and the standby is changed to another base station, the control unit 120 starts receiving the control channel as described above. At the same time, the search time is set in the first counter 108 and the search cycle is set in the second counter 109, and counting for time measurement is started. While the control channel is being received, the counts of the first counting unit 108 and the second counting unit 109 are advanced. When the count reaches the previously set value, the control unit 120 is notified that the time has expired. When the control channel of the base station cannot be received within the search time counted by the first counting unit 108, that is, when the first counting unit 108 notifies the control unit 120 that the time has expired. The control unit 120 stores that the reception of the first search operation is not possible, and at the same time, controls the wireless unit 101 and the frame processing unit 102 to be in a reception stopped state. When the second counting unit 109 notifies the control unit 120 that the time of the search cycle has expired, the control unit 120 performs the search operation again in the same manner as described above, so that the wireless unit 101, the frame The processing unit 102, the first counting unit 108, and the second counting unit 109 are controlled. At this time, the value set in the first counting unit 108 is set to a value smaller than the previously set value. Thereafter, until the control channel of the base station can be received, the control channel is received for the time counted by the first counting unit 108 at the time interval counted by the second counting unit 109 as described above. Operate. Here, the control unit 120 performs reception and reception stop according to the time expiration notification from the first counting unit 108 and the second counting unit 109 from the start of the search of the base station until the control channel of the base station is received. Although the control is repeated, the setting of the first counter 108 is set so that the reception time is shortened every time reception for search is repeated. After the reception and stop are repeated more than the predetermined number of times, the reception time set in the first counting unit 108 is set to a fixed value. Note that the reception time at this time should not be shorter than the transmission cycle of the control channel of the base station, and even if the base station cannot receive for a long time and repeats reception and stop, The continuous reception time for searching for the base station is set so that there is always a timing that coincides with the transmission timing of the base station.

  Next, the operation of the wireless communication apparatus searching for the control channel of the base station and shifting to standby will be described using FIG.

  In the example of FIG. 2, the base station has shown the example which is transmitting the control channel at the time interval of T0. When the search operation is started, the wireless communication device first operates the reception circuit of the wireless unit 101 so as to be in a control channel reception state, and thereby enters a continuous reception state. When the control channel of the base station is received, continuous reception is stopped, and thereafter, reception is performed in accordance with the transmission cycle of the control channel of the base station, and transition is made to an intermittent reception state in which reception is stopped during other periods.

  Next, the operation when the control channel of the base station cannot be received will be described using FIG.

  In FIG. 3, when the search for a base station is started, the wireless communication apparatus first receives during T1 and stops receiving in the first search. In the second search, reception is performed for T2 shorter than T1, and in the third search, reception is performed for T3 shorter than T2. In subsequent searches, the search is performed for a certain period of time T3. Further, each search cycle is constant at T0, and the time during which reception is stopped during reception for search becomes longer according to the change in search time so that the search cycle becomes constant.

  Note that the reception time control for searching for the control channel of the base station is not limited to the method of shortening each time every reception as described above, but the method of shortening the time every certain number of times, or A method in which the reception time is set longer until a certain number of times of reception is performed, and thereafter the reception time is shortened sequentially, or a method in which the reception time is set longer until a certain number of times of reception is performed, and thereafter the reception time is set shorter. Etc., and by controlling the reception time to be shortened at any timing after the search starts, the current consumption when performing reception for base station search in an environment where the control channel of the base station cannot be received Suppress the increase.

  Next, an operation for reducing current consumption by combining control that repeats the search operation without receiving the control channel of the base station and control that is performed periodically will be described.

1 is in a state where it cannot receive the control channel of the base station, in addition to the control for searching the control channel of the base station described above, the display refresh of the LCD, the calculation of the remaining battery power, etc. Such periodic control is performed. In the state where the base station search is repeated, the wireless communication device is in the reception stop state during the continuous reception for the search, and the CPU of the control unit 120 that controls the device to reduce the current consumption Transition to a state of temporarily stopping (hereinafter referred to as “HALT state”). When the next base station search timing comes from this state, the CPU is activated by interrupt processing and starts the reception operation. At this time, after controlling the wireless unit 101 and the like so as to start reception, the CPU continues to perform periodic processing such as LCD display refresh and battery remaining amount calculation. Then, when the reception process and the periodic process such as the LCD display refresh and the battery remaining amount calculation are completed, the CPU again transitions to the HALT state. As described above, the wireless communication apparatus has many controls that are periodically executed. Also, in order to reduce current consumption, when the CPU does not need to perform any processing, the CPU is set in the HALT state, and the timer interrupt is performed. When the CPU is restarted and the base station search channel cannot be received, when the base station search operation is performed at a fixed period, the control of other periodic operations and the search operation control are combined. It is possible to reduce the number of processes for transitioning the CPU from the HALT state to the activated state, and the CPU load and operating current can be reduced by this process.

  Next, a search method (control data search method) in which the wireless communication apparatus in FIG. 1 searches for a base station will be described with reference to FIG.

  The flowchart of FIG. 4 shows a control flow when searching for the control channel of the base station when the wireless communication device is turned on, after the call is finished, or when it is difficult to receive the control channel of the base station on standby. Show.

When the search for the control channel of the base station is started, first, the number of searches and the initial search time T are set as initial values (S1). In the present embodiment, the initial search time is set to 10 seconds. Subsequently, a period timer that counts the search period and a search timer that counts the search time are started, and each elapsed time starts to be counted. Control is performed so that reception is possible and continuous reception is performed (S2). In the present embodiment, the set value of the search cycle timer set in step S2 is set to 20 seconds. Further, the search timer set value set in the first step S2 is set to the value of the search time T set in step S1, that is, 10 seconds. After the search is started, it is determined whether or not the base station has been able to receive (S3) and whether or not the search timer has expired (S4). If the base station is received during continuous reception, the determination is “Yes” in the determination as to whether or not the base station has been received (S3), the search ends, and intermittently synchronized with the transmission timing of the control channel of the base station. Transition to reception operation (not shown). If the state where the control channel of the base station cannot be received continues, detection of the base station is continued until the search timer expires. If the search timer expires, it is determined whether or not the search timer has expired. "Yes", the process proceeds to the control for stopping the search, that is, the control for stopping the reception (step S5). After stopping the search, it is determined whether or not the periodic timer has expired (S6). If the periodic timer has expired, “Yes” is determined in step S6 where it is determined whether or not the periodic timer has expired, and the process proceeds to step S7 to count up the number of searches. Then, the number of searches is determined (S8), and it is determined whether or not the number of searches has reached the specified number of times. If it is equal to or greater than the specified number of times, the process proceeds to step S10 where the search time is set to a fixed value. In the present embodiment, the specified number of search times determined in step S8 is set to 4, and when the search number (search retry number) does not reach the specified number, the search time is subtracted by 2 seconds, After reaching the specified number of times, the search time is controlled to 4 seconds. Therefore, in the present embodiment, when the first search time expires, the next search time is set to 8 seconds. After the next search time is set in step S9 or step S10, the process returns to step S2, and a cycle timer for counting the search cycle set to the same value as the previous time, and the search set in step S9 or step S10. A search timer that counts the search time set to the time value is started, and each elapsed time starts to be counted, and the search start control, that is, the receiving circuit is made ready to receive the control channel of the base station. The control for setting the continuous reception state is performed, and thereafter, the continuous reception of the time determined by the search time T is repeated at the time interval set in the cycle timer until the control channel of the base station is received. Therefore, in the case of the present embodiment, reception of the base station search is started at an interval of 20 seconds, and continuous reception for 4 seconds is continued after the first 10 seconds, the second 8 seconds, the third 6 seconds, and the fourth time. The

  In this embodiment, an example is shown in which the search time setting according to the number of searches is uniformly subtracted according to the search time. However, the rate of shortening the search time is initially reduced and gradually increased. The method is also effective. For example, the control is performed so that the first search time is 10 seconds, the second search time is 9 seconds, the third search time is 7 seconds, and the fourth and subsequent search times are 4 seconds. In this case, since the reception time is set longer immediately after the search operation of the control channel of the new base station is started, the base station can be used at the end of the call or when changing the standby to another base station in the base station area. When the search operation is started in a state where the station control channel can be received, the base station control channel is received due to a temporary reception error due to a temporary decrease in reception level due to fading or interference due to radio interference. If this is not possible, the base station determines that it cannot receive and stops reception, reducing the risk of delay in returning to the standby state, improving user convenience, and controlling the control channel of the base station. When the state where reception is impossible continues, the reception time can be shortened earlier, so that the effect of reducing current consumption can be increased.

  Further, in the present embodiment, the number of branches according to the number of searches in step S8 is two. However, a plurality of branches can be provided, and the search time can be determined according to the number of searches more finely. For example, it is possible to perform control such that the search time is 10 seconds when the number of searches is less than 10 times, the search time is 7 seconds when the search time is 10 times or more and less than 100 times, and 4 seconds when the search time is 100 times or more.

  In the present embodiment, an example of a control flow for shifting to each step while performing determination of a base station detection result and determination of expiration of a timer by the CPU has been shown. However, it is possible to shift a step by interrupt processing. That is, the CPU starts the periodic timer and the search timer in step S2, shifts to the HALT state when the wireless unit 101 enters the continuous reception state, and the base station from the hardware (for example, the frame processing unit of the first embodiment). The CPU is restarted by an interrupt for notifying reception of the signal, and the process proceeds to the search end state, and the CPU is restarted by the interrupt of the search timer expiring, and the process proceeds to step S5. A method is also possible in which the CPU is restarted upon interruption of the periodic timer and the process proceeds to step S7.

As described above, according to the present embodiment, a wireless communication apparatus that communicates with a base station that transmits control data and receives control data of the base station during standby, and that is a wireless communication device that receives a radio signal. Unit 101, a first counting unit 108 that counts the time for receiving control data periodically transmitted by the base station, and a second that counts an interval for receiving control data periodically transmitted by the base station Counting unit 109 and a control unit 120 for controlling the whole, and the control unit 120 is a radio unit for a time determined by the first counting unit 108 in order to capture control data transmitted by the base station. 101 is controlled to receive the control data of the base station, and when the control data cannot be received, it is determined again by the first counter 108 at the time interval determined by the second counter 109. Radio part 10 Is controlled so as to receive the control data of the base station, and when the control data of the base station cannot be received and the reception is repeated, the time counted by the first counting unit 108 is shortened. In the environment where the station cannot receive, it is possible to shorten the time that the current when receiving for searching for the base station is consumed, and the current consumed while the base station cannot receive can be reduced. If a temporary base station reception error occurs at the start, control is performed so that the search time is extended at the start of the search, and it is determined that the base station could not be received and the search is stopped and the standby state is entered. In the environment where the base station cannot receive, the search start time is fixed and the search and pause are repeated so that the duration of the state in which reception is not possible is reduced. Regardless, the delay in returning to the standby state when receiving is reduced, and at the same time the timer control is shared with other periodically activated controls, increasing the CPU load and accompanying consumption. An increase in current can be reduced.

(Embodiment 2)
FIG. 5 is a block diagram showing a wireless communication apparatus according to the second embodiment of the present invention. FIGS. 6A, 6B, and 6C are timing diagrams showing search timings, and FIG. It is a flowchart which shows operation | movement of a communication apparatus.

  In FIG. 5, the antenna 100, the radio unit 101, the frame processing unit 102, the audio processing unit 103, the microphone 104, the speaker 105, the operation unit 106, and the display unit 107 are the same as those in FIG. Description is omitted. Reference numeral 110 denotes a counting unit that counts a search time and a stop time between base station searches when searching for a base station, and 130 denotes a control unit that controls the entire apparatus. The operation during communication in the radio communication apparatus in FIG. 5 and the operation for continuously receiving the control channel of the base station and shifting to the intermittent reception synchronized with the control channel are received as in the first embodiment. Therefore, the description is omitted. Here, the operation when the radio communication apparatus of FIG. 5 repeats continuous reception without receiving the control channel of the base station will be described.

  When the wireless communication apparatus of FIG. 5 searches for the control channel of the base station, the control unit 130 controls the wireless unit 101 and the frame processing unit 102 to receive the control channel of the base station, and controls the wireless unit 101 and the frame. While the processing unit 102 starts continuous reception for searching for a base station, the control unit 130 sets a search time in the counting unit 110 and the counting unit 110 starts counting the search time. Before the control unit 130 is notified of expiration of the search time from the counting unit 110, the control channel of the base station is received. When the frame processing unit 102 notifies the control unit 130 of reception of the control channel, the control unit 130 Notifies the counting unit 110 to stop counting, and thereafter controls the radio unit 101 and the frame processing unit 102 to perform intermittent reception in accordance with the transmission period of the control channel transmitted by the base station. To do. When the search time counted by the counting unit 110 is expired without receiving the control channel of the base station and the counting unit 110 notifies the control unit 130 that the search time has expired, the control unit 130 And the frame processing unit 102 is controlled to stop receiving the control channel of the base station, and continuous reception for base station search is stopped in the radio unit 101 and the frame processing unit 102, and the control unit 130 The search stop time is set in the counting unit 110, and the counting unit 110 starts counting the search stop time. When the search stop time counted by the counting unit 110 expires and the control unit 130 notifies the control unit 130 that the search stop time has expired, the control unit 130 resumes receiving the control channel of the base station. Therefore, the wireless unit 101 and the frame processing unit 102 are controlled to receive the control channel of the base station, and the wireless unit 101 and the frame processing unit 102 start continuous reception for searching the base station, The control unit 130 sets the search time in the counting unit 110, and the counting unit 110 starts counting the search time. At this time, the search time set in the counting unit 110 is set to be shorter than the previously set time. Thereafter, until the control channel of the base station is received, continuous reception and stop are repeated while gradually shortening the continuous reception time according to the search time and search stop time counted by the counting unit 110. The control unit 130 performs control so that the search time becomes constant after a certain number of continuous receptions and stops, and the search time for performing the shortest continuous reception at this time is the control channel of the base station. Is selected to be longer than the transmission interval.

Further, when the continuous reception and stop for the search are repeated as described above, the pause period counted by the counting unit 110 may be variably controlled. In other words, the pause period is gradually shortened, and when reception of the base station becomes possible during the pause period, continuous reception for searching for the base station is started earlier and the standby state (synchronized with the control channel of the base station). It is also possible to return to the state of intermittent reception). In this case, in order to reduce the current consumption when repeating the continuous reception and the stop for the control channel search of the base station, when the continuous reception and the stop are repeated, the stop time is set at the ratio of the continuous reception time and the stop time. It is necessary to change the reception time and the stop time so that the proportion occupied becomes large. For example, immediately after the search is started, the reception time and stop time are controlled so that the reception time is 10 seconds, the stop time is 5 seconds, and finally the reception time and stop time are both 1 second. In this case, the ratio of the reception time to the stop time at the start of the search is 2: 1, and the final ratio is 1: 1, and the average value of the current consumption during the total time of the continuous reception and the stop time is reduced. Is done. Moreover, when performing control which makes a rest time variable, you may control so that a rest time may be lengthened gradually. For example, immediately after the search is started, the reception time is set to 10 seconds, the stop time is set to 5 seconds, and finally the reception time and the stop time are controlled to be variable so that the reception time is 1 second and the stop time is 10 seconds. In this case, the ratio between the reception time and the stop time at the start of the search is 2: 1, and the final ratio is 1:10, which further has an effect of reducing current consumption.

  Next, an example of control timing when the search and stop of the control channel of the base station is repeated in the wireless communication apparatus of FIG. 5 will be described using FIG.

  FIG. 6A shows an example in which the stop period is constant and the search time is gradually shortened. In FIG. 6A, continuous reception for base station search is performed for the time T1 immediately after the start of search, and when the control channel cannot be received, the reception is stopped for the time T0, and then the time base station for T2 Perform continuous reception for search. If the control channel cannot be received again, the reception is stopped for the time T0, and then the continuous reception for the time base station search of T3 is performed. Thereafter, the base station search operation is performed until the control channel is received while repeating the reception stop at the time T0 and the continuous reception at the time T3. In this embodiment, continuous reception for search is T1> T2> T3, and the continuous reception time is gradually shortened, so even if the control channel of the base station cannot be received continuously , Current consumption can be suppressed. In addition, when the search operation is started in a state where the control channel of the base station can be received, such as when the call is ended or when standby is changed to another base station in the base station area, the temporary reception level of fading is reduced. When the base station control channel cannot be received due to a temporary reception error due to degradation or interference due to radio interference, the base station It is determined that reception is not possible, the reception is stopped, and there is little risk of delay in returning to the standby state, thereby improving user convenience. In addition, since the suspension time is constant at T0, processing for determining the suspension time becomes unnecessary, the processing can be reduced, and when the base station is ready to receive, the elapsed time from the start of the search is reached. Regardless of this, it is always possible to return to the standby state in a time equal to or less than T0, and even if the base station cannot receive for a long time and then becomes ready to receive, the return to the standby state is not delayed. Convenience is improved. In addition, the search time and stop time can be measured with one timer, and the circuit can be simplified.

  FIG. 6B shows an example in which both the search time and the stop time are gradually shortened. In FIG. 6B, continuous reception for the search of the base station is performed for the time T1 immediately after the start of the search, and when the control channel cannot be received, the reception is stopped for the time T01 and then the base station for the time T2. Perform continuous reception for search. If the control channel cannot be received again, the reception is stopped for the time T02, and then the continuous reception for the time base station search for T3 is performed. Thereafter, the base station search operation is performed until the control channel is received while repeating the reception stop at the time T03 and the continuous reception at the time T3. At this time, both the search time and the stop time are gradually shortened so that the ratio of the continuous reception in the total time of the continuous reception and the stop time is gradually reduced. That is, the search time and stop time are controlled so that (T1 / (T1 + T01))> (T2 / (T2 + T02))> (T3 / (T3 + T03)).

As described above, in this embodiment, since the search time and stop time are gradually shortened so that the ratio of continuous reception in the total time of continuous reception and stop time is gradually reduced, the control channel of the base station receives Even if the incapable state continues, the current consumption can be suppressed. In addition, when the search operation is started in a state where the control channel of the base station can be received, such as when the call is ended or when standby is changed to another base station in the base station area, the temporary reception level of fading is reduced. When the base station control channel cannot be received due to a temporary reception error due to degradation or interference due to radio interference, the base station It is determined that reception is not possible, the reception is stopped, and there is little risk of delay in returning to the standby state, thereby improving user convenience. In addition, since the control is performed so as to shorten the search pause time, even after the base station has not been able to receive for a long time, even if it becomes a receivable state, the return to the standby state is not delayed, User convenience is improved. In addition, the search time and stop time can be measured with one timer, and the circuit can be simplified.

  FIG. 6C shows an example in which the search time is shortened and the stop time is lengthened. In FIG. 6C, continuous reception for the search of the base station is performed for the time T1 immediately after the start of the search, and when the control channel cannot be received, the reception is stopped for the time T0, and then again the time T1. When continuous reception for base station search is performed and the control channel cannot be received, reception is stopped for the time T01. Then, continuous reception for searching for a base station is started for a time T2. If the control channel cannot be received again, the reception is stopped for the time T02, and then the continuous reception for the time base station search of T2 is performed. Thereafter, the base station search operation is performed until the control channel is received while repeating the reception stop at the time T02 and the continuous reception at the time T2. As described above, in the present embodiment, since the search time is shortened and the stop time is lengthened, the current consumption can be further suppressed even if the state where the control channel of the base station cannot be received continues. . In addition, when the search operation is started in a state where the control channel of the base station can be received, such as when the call is ended or when standby is changed to another base station in the base station area, the temporary reception level of fading is reduced. When the base station control channel cannot be received due to a temporary reception error due to degradation or interference due to radio interference, the base station It is determined that reception is not possible, the reception is stopped, and there is little risk of delay in returning to the standby state, thereby improving user convenience. In addition, the search time and stop time can be measured with one timer, and the circuit can be simplified. In addition, the control can be performed by changing the search time and the stop time only once in the middle of the repetition, so that it is not necessary to calculate the search time and the stop time every time the search is repeated, and the processing can be reduced. In the example of FIG. 6C, the search time and the stop time are changed only once. However, the search time and the stop time are changed at least twice at a predetermined repetition time. Also good.

  Next, a search method (control data search method) in which the wireless communication apparatus in FIG. 5 searches for a base station will be described with reference to FIG.

  The flowchart of FIG. 7 shows a control flow when searching for the control channel of the base station when the wireless communication device is turned on, after the call ends, or when it becomes difficult to receive the control channel of the base station that is on standby. FIG. 6A shows an example of realizing the control that repeats the search and stop shown in FIG.

When the search for the control channel of the base station is started, first, the number of searches and the initial search time T are set as initial values (S11). In the present embodiment, the initial search time is set to 10 seconds. Subsequently, a timer is started to count the search time, the elapsed time is started, and the search start control, that is, the reception circuit of the radio unit 101 is made ready to receive the control channel of the base station, and the continuous reception state The control is performed (S12). As the setting value of the timer set in the first step S12, the value of the search time T set in step S11, that is, 10 seconds is set. After the search is started, it is determined whether or not the base station has been able to receive (S13) and whether or not the timer for detecting the expiration of the search time has expired (S14). If the base station is received during continuous reception, “Yes” is determined in step S13 to determine whether or not the base station has been received, the search is terminated, and then intermittent reception synchronized with the transmission timing of the control channel of the base station continues. Transition to operation (not shown). If the state where the control channel of the base station cannot be received continues, detection of the base station is continued until the timer expires. If the timer expires, it is determined whether or not the timer has expired. ", The search is stopped, that is, the reception is stopped, the timer for counting the pause time is set (in this embodiment, the pause time is set to 6 seconds), and the control is started (S15). Then, it is determined whether or not the timer for counting the pause time has expired (S16). If the timer has expired, “Yes” is determined in step 16 where it is determined whether or not the timer has expired, and the process proceeds to step S17 to count up the number of searches. Then, the number of searches is determined (S18). If the number of searches is less than the specified number, the process proceeds to step S19 where the search time is varied according to the number of searches. Then, the process proceeds to step S20. In the present embodiment, the specified number of search times determined in step S18 is 3, and if the search number (search retry number) has not reached the specified number, the search time is subtracted by 2 seconds, After reaching the specified number of times, the search time is controlled to 6 seconds. Therefore, in this embodiment, when the first search time expires, the next search time is set to 8 seconds. After the next search time is set in step S19 or step S20, the process returns to step S12, and a timer for counting the search time set to the search time value set in step S19 or step S20 is started. The count of elapsed time is started, and search start control is performed, that is, control is performed so that the receiving circuit of the wireless unit 101 can receive the control channel of the base station and is continuously received. Thereafter, the control channel of the base station Until the time is received, the continuous reception of the time determined by the search time T and the pause time of a fixed time (6 seconds in this embodiment) are repeated. Therefore, in the case of this embodiment, when the base station search control is started, continuous reception for 10 seconds, stop for 6 seconds, continuous reception for 8 seconds, stop for 6 seconds, and then continuous reception for 6 seconds, The stop for 6 seconds is repeated.

  In the present embodiment, the example in which the setting of the search time according to the number of searches in step S18 is uniformly subtracted according to the search time is shown. However, the ratio of shortening the search time is initially reduced, A method of gradually increasing the size is also effective. For example, the control is performed such that the first search time is 10 seconds, the second search time is 9 seconds, the third search time is 7 seconds, and the fourth and subsequent search times are 4 seconds. Further, in the present embodiment, the number of branches according to the number of searches in step S18 is two, but a plurality of branches can be provided, and the search time can be determined according to the number of searches more finely. For example, it is possible to perform control such that the search time is 10 seconds when the number of searches is less than 10 times, the search time is 7 seconds when the search time is 10 times or more and less than 100 times, and 4 seconds when the search time is 100 times or more.

  In the present embodiment, the example in which the timer for setting the stop time is set to a fixed value in step S15 is shown. However, as shown in FIGS. 6B and 6C, continuous reception is performed according to the number of repetitions. It is also possible to variably control the stop time so that the ratio of the stop time in the total stop time becomes large. Further, in the present embodiment, an example of a control flow for shifting to each step while performing determination of a base station detection result and determination of timer expiration by the CPU has been shown. However, as described in the first embodiment, timer expiration It is also possible to shift steps by interrupt processing of base station reception.

As described above, according to the present embodiment, a wireless communication apparatus that communicates with a base station that transmits control data and receives control data of the base station during standby, and that is a wireless communication device that receives a radio signal. Unit 101 and a count for counting the time for receiving control data periodically transmitted by the base station and the time for stopping radio unit 101 when the control data periodically transmitted by the base station cannot be received Unit 110 and a control unit 130 that controls the whole, and the control unit 130 controls the radio unit 101 of the base station for a time determined by the counting unit 110 in order to capture control data transmitted by the base station. Control is performed so that the control data is received. If the control data cannot be received, control is performed so that the reception operation of the wireless unit 101 is stopped for a time determined by the counting unit 110. Decided When the wireless unit 101 repeats control to receive base station control data for the time determined by the counting unit 110 again after the elapse of time, and the base station control data cannot be received, the reception is repeated. At least once, the reception time is made smaller than the previous reception time, and the time counted by the counting unit 110 is controlled so that the ratio of the reception period is equal to or smaller than the previous ratio in the reception period and the subsequent stop period. By this, it is possible to shorten the time during which the current during reception for base station search is consumed in an environment where the base station cannot receive, and to reduce the current consumed while the base station cannot receive At the same time, it can be received by repeating the search and pause without increasing the search pause time provided to reduce current consumption in an environment where the base station cannot receive. Regardless of the duration of the status, the delay in returning to the standby status can be reduced when reception is possible, and when a temporary base station reception error occurs at the start of the search Control is performed so that the search time is lengthened at the start of the search, and it is determined that the base station has not been received and the search is stopped, so that delay in returning to the standby state can be reduced.

  The present invention relates to a TDMA wireless communication apparatus that performs communication using wireless signals and a control data search method for searching for control data from a base station, and suppresses current consumption when the base station is out of service area. can do.

1 is a block diagram showing a wireless communication apparatus according to Embodiment 1 of the present invention. (A) Timing diagram showing transmission timing of base station control data, (b) Timing diagram showing reception timing in radio communication apparatus (terminal) Timing diagram showing search timing in wireless communication device The flowchart which shows operation | movement of the radio | wireless communication apparatus of FIG. FIG. 3 is a block diagram showing a wireless communication apparatus according to Embodiment 2 of the present invention. (A) Timing diagram showing search timing, (b) Timing diagram showing search timing, (c) Timing diagram showing search timing The flowchart which shows operation | movement of the radio | wireless communication apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Antenna 101 Radio | wireless part 102 Frame processing part 103 Audio | voice processing part 104 Microphone 105 Speaker 106 Operation part 107 Display part 108 1st counting part 109 2nd counting part 110 Counting part 120,130 Control part

Claims (4)

A wireless communication device that communicates with a base station that transmits control data and receives control data of the base station during standby,
A radio unit that receives a radio signal, a first counting unit that counts time for receiving control data periodically transmitted by the base station, and control data that is periodically transmitted by the base station A second counting unit that counts the interval to be performed, and a control unit that controls the whole,
The control unit controls the radio unit to receive the control data of the base station for a time determined by the first counting unit in order to capture the control data transmitted by the base station; If the control data could not be received, the radio unit receives the control data for the base station again at the time interval determined by the second counter for the time determined by the first counter again. The wireless communication apparatus, wherein control is performed so that reception is repeated, and when the reception is repeated without receiving control data of the base station, the time counted by the first counting unit is shortened. A wireless communication device that communicates with a base station that transmits control data and receives control data of the base station during standby,
A radio unit for receiving radio signals; a time for receiving control data periodically transmitted by the base station; and a radio unit when the control data periodically transmitted by the base station cannot be received. It has a counting unit that counts the time to stop, and a control unit that controls the whole,
The control unit controls the radio unit to receive the control data of the base station for a time determined by the counting unit in order to capture the control data transmitted by the base station, and If the data cannot be received, control is performed so that the reception operation of the wireless unit is stopped for the time determined by the counting unit, and the time is determined by the counting unit again after the time determined by the counting unit has elapsed. When the control is repeated so that the radio unit receives the control data for the base station for a predetermined time, and the reception is repeated without receiving the control data for the base station, the reception time is set to the previous time at least once. The time measured by the counting unit is controlled so as to make the time smaller than the reception time and to make the ratio of the reception period equal to or smaller than the previous ratio in the reception period and the subsequent stop period. Communication device. A control data search method for searching for control data transmitted from a base station in a wireless communication device that communicates with a base station that transmits control data and receives control data of the base station during standby ,
A search time determining step for determining a search time, a receiving step for receiving for searching for the base station during the search time determined in the search time determining step, and the base within the determined search time If the control data for the station cannot be received, the reception stop step for stopping the reception, the search start cycle measuring step for measuring the search start cycle, and the control data for the base station can be received within the search time. If not, after the expiry of the search cycle, the search time determined in the search time determination step is determined to be a time equal to or less than the previous search time, and the search time diminishing step to move to the reception step A data retrieval method for control characterized by the above. A control data search method for searching for control data transmitted from a base station in a wireless communication device that communicates with a base station that transmits control data and receives control data of the base station during standby ,
A search time determining step for determining a search time, a receiving step for receiving for searching for the base station during the search time determined in the search time determining step, and the base within the determined search time A reception stop step for stopping reception when the control data of the station cannot be received; a stop time for stopping the reception; and a stop time for the next time and a sum of the search time and the stop time A stop time determination step for determining that the ratio of the reception time to the same or smaller than the previous ratio, and the search time determined in the search time determination step at least once after the stop time has elapsed And a search time diminishing step for determining a time shorter than the time and shifting to the receiving step.

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