KR100441701B1 - Communication terminal and wireless communication method - Google Patents

Abstract

In the correlation circuit 103, a despreading process is performed on the received signal to obtain a correlation value. This correlation value is transmitted to the cell detection circuit 104 and the cell monitoring circuit 105. The results of the cell detection and cell monitoring are transmitted to the cell management table 106, and the cells are classified and managed. After the cycle of cell monitoring and cell detection is changed by various events, the management circuit 107 performs cell detection and cell monitoring on the cell detection circuit 104 and the cell monitoring circuit 105 at the changed cycle. Instructions to be executed are given.

Description

COMMUNICATION TERMINAL AND WIRELESS COMMUNICATION METHOD}

Code Division Multiple Access (CDMA) has been developed as a multiple access method for use in the next generation mobile communication system. In this CDMA cellular system, the communication terminal performs cell detection or cell monitoring by cell switching (handover) or the like in accordance with movement.

The cell detection method in this CDMA cellular system is described by Haguchi, Sawabashi, Yasatsuchi et al. "High-speed cell search method using a long code mask in asynchronous cells between DS-CDMA base stations." RCS96-122, 1997 As described in -01, a method of detecting the timing and type of the scrambling code by masking the scrambling code of the downlink control channel and performing correlation detection on the masked portion with a spreading code common to each cell. Is proposed.

In this scheme, the transmitting side (base station) uses the symbols spread by the scrambling code group identification short code according to the scrambling code of each cell and the symbols spread by the common spreading code of each cell as a search code to the scrambling code mask portion. After multiplexing and transmitting the code, the receiving side (communication terminal) detects the slot timing by the spreading code common to each cell, and then uses the scrambling code group identification short code to define scrambling code candidates to be searched in the scrambling code identification. Frame timing is detected, and a cell-specific scrambling code is specified from this scrambling code candidate. As a result, new cells can be detected at high speed.

In addition, the cell monitoring does not execute the above-described cell detection again, but the scrambling code and the base station whose coarse frame timing has been determined, the current level (Ec / I0 (signal power / transmit / receive power after despreading). ) Refers to a process for examining a signal to interference ratio (SIR).

Conventionally, the communication terminal always performs cell detection and cell monitoring at a fixed cycle. However, when the communication terminal performs cell detection or cell monitoring at all times, the power consumption at the terminal increases, and the talk time and reception wait time are shortened. On the other hand, if the frequency of cell detection or cell monitoring is made extremely low, accurate cell management cannot be performed in real time, and there is a possibility that the handover may fail and the call may be disconnected.

Disclosure of the Invention

An object of the present invention is to provide a communication terminal apparatus and a wireless communication method which can save power consumption as much as possible, and can accurately perform cell management in cell detection and cell monitoring in real time.

The subject of the present invention is to dynamically control the frequency of cell detection and cell monitoring according to various factors (events), to reduce the power consumption as much as possible, and to further control the cell management in cell detection and cell monitoring in real time. Will run exactly as

The present invention relates to a communication terminal device and a wireless communication method in a digital wireless communication system.

1 is a block diagram showing the configuration of a communication terminal apparatus according to Embodiment 1 of the present invention;

2 is a diagram showing a cell management table in a communication terminal device according to the present invention;

3 is a diagram showing a cell management table in a communication terminal device according to the present invention;

4 is a diagram showing a cell management table in a communication terminal device according to the present invention;

5 is a diagram showing a cell management table in a communication terminal device according to the present invention;

6 is a block diagram showing the configuration of a communication terminal apparatus according to Embodiment 2 of the present invention;

7 is a block diagram showing the configuration of a communication terminal apparatus according to Embodiment 3 of the present invention;

8 is a block diagram showing the configuration of a communication terminal apparatus according to Embodiment 4 of the present invention;

9 is a block diagram showing the configuration of a communication terminal apparatus according to Embodiment 5 of the present invention;

10 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 6 of the present invention;

11 is a block diagram showing the construction of a communication terminal apparatus according to Embodiment 7 of the present invention;

12 is a block diagram showing the construction of a communication terminal apparatus according to Embodiment 8 of the present invention.

Best Mode for Carrying Out the Invention

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

(Example 1)

1 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 1 of the present invention. Here, in the normal state, the period of cell detection and cell monitoring is set long, and if necessary, the cell monitoring mode for shortening the cycle of cell monitoring, the cell detection mode for shortening the cycle of cell detection, and cell monitoring and The case where a mode switch is made to the cell monitoring / detection mode which shortens the period of cell detection is demonstrated. In addition, although lengthening a period means making it about 5s, for example, it does not specifically limit about this period. In this manner, the cell monitoring and the cell detection are performed in a normal state at a long cycle, thereby making it possible to efficiently use the power consumption of the apparatus.

In this communication terminal apparatus, the signal transmitted from the radio base station apparatus is received by the radio receiving circuit 102 via the antenna 101. The radio reception circuit 102 performs predetermined radio reception processing (for example, down conversion, A / D conversion, and the like) on the reception signal.

The received signal subjected to the radio reception processing in this way is output to the correlation circuit 103. In the correlation circuit 103, the despreading process is performed on the received signal using a spreading code used for spreading modulation on the transmitting side, and a correlation value is obtained. This correlation value is passed to the cell detection circuit 104.

The cell detection circuit 104 detects a cell using the correlation value obtained by the correlation circuit 103. The correlation value obtained by the correlation circuit 103 is also transmitted to the cell monitoring circuit 105. In addition, the output from the correlation circuit 103 is transmitted to the demodulation circuit 109, and demodulation processing is performed on the signal after the correlation processing to obtain received data.

The result of the cell detection and the result of the cell monitoring in the cell detection circuit 104 and the cell monitoring circuit 105 are transmitted to the cell management table 106, and the cell management table 106 is updated as necessary. In the cell management table 106, the base station is managed by classifying the base station as being currently active, candidate for handover, or neighboring at low level.

The information of this cell management table 106 is transmitted to the connection processing control circuit 108 and also to the management circuit 107. The connection processing control circuit 108 controls connection processing and the like at the time of handover based on the information (classification result) of the cell management table.

In addition, the management circuit 107 instructs cell detection or cell monitoring based on the information in the cell management table. That is, if cell detection is necessary, a control signal for performing cell detection is transmitted to the cell detection circuit 104, and if cell monitoring is required, a control signal for the cell monitoring is transmitted to the cell monitoring circuit 105. do.

Meanwhile, the transmission data is transmitted to the digital modulation circuit 110, digitally modulated, and transmitted to the diffusion modulation circuit 111. In the spreading modulation circuit 111, spreading modulation processing is performed on a signal after digital modulation using a predetermined spreading code, and the spreading modulated transmission data is transmitted to the radio transmitting circuit 112. In the radio transmission circuit 112, predetermined radio transmission processing (D / A conversion, upconversion, etc.) is performed on the transmission data after spread modulation. The transmission signal subjected to the radio transmission is transmitted to the base station via the antenna 101.

Next, the cycle control of cell detection and cell monitoring of the communication terminal device having the above configuration will be described.

In the correlation circuit 103, a despreading process is performed on the received signal to obtain a correlation value. This correlation value is transmitted to the cell detection circuit 104 and the cell monitoring circuit 105. After detecting the slot timing by the spread code common to each cell, the cell detection circuit 104 limits the scrambling code candidates to be searched by the scrambling code identification using the scrambling code group identification short code, and frame timing Is detected, and a cell detection process of specifying a cell-specific scrambling code from this scrambling code candidate is performed.

The cell monitoring circuit 105 performs a process of checking the current level (Ec / I0, SIR) with respect to the scrambling code and the base station whose timing of the rough frame is found.

The results of the cell detection and cell monitoring are transmitted to the cell management table 106, and the cells are classified and managed. For example, in the cell management table 106, as shown in FIG. 2, the base station "currently communicating" (Active) currently in communication, the base station "handover target candidate (Candidate)" which is a candidate for handover or handover. It is classified and managed as a base station having a low level, which is not a candidate, and having a low neighboring level.

That is, as can be seen from Fig. 2, base station # 2 is currently communicating, base stations # 1, # 6 are candidates for handover target, and base stations # 3, # 4, # 5 are not candidates for handover target. Is low.

The management circuit 107 changes the period (frequency) of cell detection or cell monitoring based on the information in the cell management table 106 and the results of the cell detection circuit 104 and the cell monitoring circuit 105. This threshold value determination is performed based on the level and number of base stations classified as follows, for example. Specifically, the following method is mentioned.

First, as the first method, when the level of "currently active (active)" is less than a threshold value, or when communicating with a plurality of base stations such as during handover, each of the "currently active (active)" If the sum is less than the threshold, the period of cell monitoring of "handover target candidate" or "neighboring level (neighbor)" is shortened (high frequency). Referring to FIG. 2, when the level of the base station # 2 that is "active" is less than the threshold value, the cell monitoring periods for the base stations # 1 and # 6 that are "handover target candidates" (Candidate) Shorten.

In this way, when the "active" level is below the threshold, the frequency level of the signal from the base station is hidden because the frequency of the signal from the base station is hidden in the shadow of a building or the like, or is at the cell edge. I think this is low. In this case, the cell monitoring cycle of the "handover target candidate (Candidate)" is shortened to find a handover target from the "handover target candidate (Candidate)" as soon as possible. As a result, handover can be quickly responded to and communication quality can be maintained.

As a second method, when the number of "active" is less than the threshold value, the period of cell monitoring of "handover candidate" or "neighbor" is shortened. (High frequency). In addition, when the number of " active " currently in communication is greater than or equal to the threshold value, the cell monitoring period of " handover target candidate " or " neighbor is low " Lower).

In addition, in the state where the number of "Currently active (Active)" is small, the number of "handover target candidates" (Candidate) is less than the predetermined number, or the number of "the neighboring level is low (Neighbor)". If the number is smaller than the predetermined number, since there are fewer handover targets, there is a possibility that soft handover may fail. Therefore, the period of cell monitoring and cell detection is shortened.

Referring to FIG. 3, when the "handover target candidate" (Candidate) is only the base station # 1, the period of cell monitoring is shortened to "Neighbor" where the adjacent level is low. As shown in the figure, "handover target candidates" (base stations # 3, # 6) are quickly found. Thus, soft handover can be satisfactorily performed.

As a third method, the period of cell detection is shortened when both the "currently active" level and the "handover target candidate" level are within an arbitrary threshold range.

In this way, when both the "Active" level and the "Handover target candidate" (Candidate) level are within an arbitrary threshold range, the "Currently active" or "Handover target candidate" (Candidate) of the signal from the base station of the base station of the "active" or "handover target candidate" (Candidate) because the frequencies of the signal from the base station are all hidden in the shadow of the building or the like It is thought that the level of all frequencies is low. In this case, the period of cell detection is shortened so that "active current" and "handover target candidate" can be found quickly. As a result, handover can be quickly responded to, and communication quality can be maintained.

As a fourth method, the cell monitoring cycle of the base station whose level is large is shortened. This is because it is considered that the base station is approaching the base station whose level is large.

For example, as shown in FIG. 5, when the base station # 7 becomes "neighbor" and the "handover target candidate" (Candidate), it is considered that the base station # 7 is approaching the base station # 7. Therefore, the cell monitoring cycle of the base station # 7 is shortened. Thus, the most likely base station can be quickly determined as a handover target.

As a fifth method, if a base station frequently switches between "active" and "handover target candidate" within a predetermined time, it is likely to be at the cell edge. The period of cell monitoring for the base station is shortened. Accordingly, it is possible to respond quickly to handover.

After the management circuit 107 changes the cycle of cell monitoring and cell detection according to the events described above, the cell detection and cell monitoring of the cell detection circuit 104 and the cell monitoring circuit 105 is performed at the changed cycle. Instructs the contents of executing.

Specifically, in the case of shortening the period of cell detection, the management circuit 107 switches the mode from the normal mode (the mode in which the period of cell detection and cell monitoring is long) to the cell detection mode, The control signal of the content of performing cell detection at a short period of time is transmitted to the cell detection circuit 104. In the case where the cell monitoring cycle is shortened, the management circuit 107 switches the mode from the normal mode to the cell monitoring mode, and the control signal of the content of executing the cell monitoring with the short period in the cell monitoring mode is the cell. It is transmitted to the monitoring circuit 105. In addition, when the period of cell detection and cell monitoring is shortened, the mode is switched from the normal mode to the cell detection and cell monitoring mode by the management circuit 107, and the cell detection is performed at a short period in the cell detection and cell monitoring mode. The control signal of the content of executing the data is transmitted to the cell detection circuit 104, and the control signal of the content of executing the cell monitoring is transmitted to the cell monitoring circuit 105.

As described above, the communication terminal apparatus according to the present embodiment dynamically reduces the frequency of cell detection and cell monitoring by the level and the number of " active " and " handover target candidates ". Therefore, power consumption can be saved as much as possible to increase the talk time and reception wait time. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

In the present embodiment, a description will be given of three types of classification of the base station: "Active", "Handover candidate", and "Neighbor". However, in the present invention, by changing the setting of the threshold value, the classification of the base stations may be set to two, or may be set to four or more.

(Example 2)

In the present embodiment, a description will be given of the case where the average value and / or variance value of Ec / I0 for each finger are monitored and the period of cell monitoring or cell detection is shortened as an event when the value becomes less than the threshold value. do.

6 is a block diagram showing the configuration of a communication terminal apparatus according to Embodiment 2 of the present invention. In FIG. 6, the same code | symbol as FIG. 1 is attached | subjected about the same part as FIG. 1, and the detailed description is abbreviate | omitted.

The communication terminal device shown in FIG. 6 includes a path monitoring circuit 601 for monitoring paths for each finger from the output of the correlation circuit 103. The path monitoring circuit 601 transmits an instruction to the management circuit 107 of the contents of changing the cycle of cell detection and cell monitoring based on the path monitoring result. The management circuit 107 transmits a control signal of the contents of the cell detection and cell monitoring to the cell detection circuit 104 and / or the cell monitoring circuit 105 at a changed cycle. Thereby, cell detection and cell monitoring are performed at the changed cycle.

Next, the cycle control of cell detection and cell monitoring of the communication terminal device having the above configuration will be described.

In the correlation circuit 103, a despreading process is performed on the received signal to obtain a correlation value. This correlation value is transmitted to the cell detection circuit 104 and the cell monitoring circuit 105 and also to the path monitoring circuit 601.

The cell detection circuit 104 and the cell monitoring circuit 105 perform cell detection or cell monitoring based on the correlation value, and transmit the result to the cell management table 106. In the cell management table 106, for example, a base station "currently active" (Active) currently communicating, a base station "Candidate" which is a candidate for a handover target, or a level which is not a candidate for handover target is low. It manages by classifying it as a base station "Neighbor." In addition, cell detection and cell monitoring are performed in the same manner as in the first embodiment.

The path monitoring circuit 601 monitors the path for each finger based on the correlation value. Specifically, the path monitoring circuit 601 obtains Ec / I0 for each finger and monitors the average value and the dispersion value. When the average value and the variance value are less than the predetermined threshold value, a control signal having a content of shortening the period of cell monitoring or cell detection is supplied to the management circuit 107 on the assumption that there is no frequency of the signal from the base station. To pass. The management circuit 107 changes the period of cell detection or cell monitoring in accordance with the control signal, and gives the cell detection circuit 104 or the cell monitoring circuit 105 an instruction of the contents of the cell detection or cell monitoring in the period. Run

As described above, the communication terminal apparatus according to the present embodiment can control the frequency of cell detection and cell monitoring dynamically according to Ec / I0 for each finger, so that the communication time and reception waiting time can be increased by saving power consumption as much as possible. have. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

In the present embodiment, the case where the period of cell detection or cell monitoring is controlled by the average value or the variance value of Ec / I0 is described. However, the present invention provides a reception quality other than Ec / I0 for each finger. The monitoring may be performed, and the period of cell detection or cell monitoring may be controlled based on the monitoring result.

(Example 3)

In this embodiment, the case where the reception level changes abruptly is monitored, and a case where the period of cell monitoring or cell detection is shortened is described as an event that the reception level changes abruptly.

7 is a block diagram showing the construction of a communication terminal apparatus according to Embodiment 3 of the present invention. In FIG. 7, the same code | symbol as FIG. 1 is attached | subjected about the same part as FIG. 1, and the detailed description is abbreviate | omitted.

The communication terminal device shown in FIG. 7 is provided with the AGC circuit 701 which performs a gain control using the output of the radio receiving circuit 102, and outputs the gain-controlled signal to the radio receiving circuit 102. As shown in FIG. The AGC circuit 701 monitors the output of the wireless reception circuit 102 and transmits an instruction to the management circuit 107 of the contents of changing the cycle of cell detection and cell monitoring based on the monitoring result. The management circuit 107 transmits a control signal of the contents of the cell detection and cell monitoring to the cell detection circuit 104 and / or the cell monitoring circuit 105 at a changed cycle. Thereby, cell detection and cell monitoring are performed at the changed cycle.

Next, the cycle control of cell detection and cell monitoring of the communication terminal device having the above configuration will be described.

The received signal received by the wireless receiving circuit 102 via the antenna 101 is subjected to predetermined wireless receiving processing in the wireless receiving circuit 102. The signal subjected to the radio reception is output from the radio reception circuit 102 to the AGC circuit 701 and gain controlled by the AGC circuit 701. At this time, the AGC circuit 701 also monitors for abrupt changes in the reception level. Then, the AGC circuit 701 monitors the cell for the management circuit 107 in the case where the reception level suddenly changes, for example, when the base station suddenly appears from the shadow of the building or when the call of the high-speed user data channel is disconnected. The control signal is sent to shorten the period of cell detection. The management circuit 107 changes the period of cell detection or cell monitoring in accordance with the control signal, and gives the cell detection circuit 104 or the cell monitoring circuit 105 an instruction of the contents of the cell detection or cell monitoring in the period. Run In addition, a sudden change in the reception level can be detected by, for example, performing a threshold value determination on the amount of change from the previous measured value.

The signal gain-controlled by the AGC circuit 701 is transmitted to the radio receiving circuit 102 to perform a predetermined radio reception process, and is transmitted to the correlation circuit 103. In the correlation circuit 103, a despreading process is performed on the received signal to obtain a correlation value. This correlation value is transmitted to the cell detection circuit 104 or the cell monitoring circuit 105. Since the processing in the cell detection circuit 104 and the cell monitoring circuit 105 is the same as in the above embodiment, description thereof is omitted. In addition, cell detection and cell monitoring are performed in the same manner as in the first embodiment.

As described above, the communication terminal apparatus according to the present embodiment dynamically controls the frequency of cell detection and cell monitoring in response to the drastic change in the reception level, thereby saving power consumption as much as possible to increase the talk time and reception wait time. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

(Example 4)

In the present embodiment, the case where the movement speed or altitude is monitored, and the movement speed or altitude is used as an event to control the cycle of cell monitoring or cell detection is described.

8 is a block diagram showing the configuration of a communication terminal apparatus according to Embodiment 4 of the present invention. In FIG. 8, the same code | symbol as FIG. 1 is attached | subjected about the same part as FIG. 1, and the detailed description is abbreviate | omitted.

The communication terminal device shown in FIG. 8 includes a moving speed and altitude measuring circuit 801 which measures a moving speed and an altitude from the output of the correlation circuit 103. The moving speed and altitude measurement circuit 801 obtains the moving speed from the Doppler frequency or the moving speed and the altitude by a positioning system. The control circuit 107 transmits an instruction of the contents of changing the cycle of cell detection and cell monitoring based on this moving speed and altitude. The management circuit 107 transmits a control signal of the contents of the cell detection and cell monitoring to the cell detection circuit 104 and / or the cell monitoring circuit 105 at a changed cycle. Thereby, cell detection and cell monitoring are performed at the changed cycle.

Next, the cycle control of cell detection and cell monitoring of the communication terminal device having the above configuration will be described.

In the correlation circuit 103, a despreading process is performed on the received signal to obtain a correlation value. This correlation value is transmitted to the cell detection circuit 104 and the cell monitoring circuit 105, and also to the moving speed and altitude measurement circuit 801.

The moving speed and altitude measuring circuit 801 measures the moving speed and altitude, and transmits a control signal for changing the period of cell detection or cell monitoring, for example, when the measured value exceeds a predetermined threshold. . The management circuit 107 changes the cycle of cell detection or cell monitoring in accordance with the control signal, and gives the cell detection circuit 104 or the cell monitoring circuit 105 an instruction of the contents of the cell detection or cell monitoring in the cycle. Run For example, when the moving speed is high (when the Doppler frequency is high), since the possibility of handover is high, the period for performing cell detection or cell monitoring is shortened. In addition, when the altitude is high, since the reflection of the signal is considered small, the period for performing cell detection or cell monitoring is lengthened.

Since the processing in the cell detection circuit 104 and the cell monitoring circuit 105 is the same as in the above embodiment, description thereof is omitted. In addition, cell detection and cell monitoring are performed in the same manner as in the first embodiment.

As described above, the communication terminal apparatus according to the present embodiment can control the frequency of cell detection and cell monitoring dynamically according to the moving speed and altitude, and save the power consumption as much as possible to increase the talk time and reception wait time. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

(Example 5)

In this embodiment, a case of controlling synchronization of cell monitoring and cell detection by using external power source information as an event will be described.

9 is a block diagram showing the configuration of a communication terminal apparatus according to Embodiment 5 of the present invention. In FIG. 9, the same code | symbol as FIG. 1 is attached | subjected about the same part as FIG. 1, and the detailed description is abbreviate | omitted.

In the communication terminal device shown in FIG. 9, the external power supply information is input to the management circuit 107. The management circuit 107 transmits a control signal of the content of cell detection and cell monitoring to the cell detection circuit 104 and / or the cell monitoring circuit 105 in accordance with the external power supply information. Thereby, cell detection and cell monitoring are performed at the changed cycle.

Examples of the external power source information include information connected to an in-vehicle kit, information connected to an AC charger, information connected to a personal computer, and the like. In other words, when the management circuit 107 receives information for identifying a device incorporated in a vehicle such as an in-vehicle kit, it is considered to move at a high speed, and thus the possibility of handover is high. Keep it short In addition, when the management circuit 107 receives the information for identifying the charger, the cycle of cell detection and cell monitoring is lengthened in order to save energy and increase the charging speed. In addition, when receiving the information identifying the external power source of the installed type device such as a personal computer, the power consumption need not be taken into account, and thus the cycle of cell detection and cell monitoring is lengthened. However, even when connected to a personal computer, the cycle of cell detection and cell monitoring is shortened when the battery of the own device is used.

Since the processing in the cell detection circuit 104 and the cell monitoring circuit 105 is the same as in the above embodiment, description thereof is omitted. In addition, cell detection and cell monitoring are performed in the same manner as in the first embodiment.

As described above, the communication terminal apparatus according to the present embodiment can dynamically control the frequency of cell detection and cell monitoring according to the external power source information, so as to save the power consumption as much as possible to increase the talk time and reception wait time. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

(Example 6)

In the present embodiment, a case where the period of cell monitoring or cell detection is shortened by using service information or spreading rate (SF) information as an event will be described.

10 is a block diagram showing the configuration of a communication terminal apparatus according to Embodiment 6 of the present invention. In FIG. 10, the same code | symbol as FIG. 1 is attached | subjected about the same part as FIG. 1, and the detailed description is abbreviate | omitted.

In the communication terminal device shown in FIG. 10, the service information and the diffusion rate information are input to the management circuit 107. The management circuit 107 transmits a control signal of the content of the cell detection and cell monitoring to the cell detection circuit 104 and / or the cell monitoring circuit 105 in accordance with the diffusion rate information. Thereby, cell detection and cell monitoring are performed at the changed cycle.

Examples of the service information include information indicating that a signal is a circuit switched type such as voice. In other words, when the management circuit 107 receives the information, which is a circuit-switched signal, from the upper layer, there is no interruption momentarily, so that the cycle of cell detection and cell monitoring is shortened.

When the management circuit 107 receives the information of the diffusion rate SF, the management circuit 107 determines whether the diffusion rate is high or low by threshold determination or the like. In the case where the diffusion rate is low, communication is likely to be cut off, so that the period of cell detection and cell monitoring is shortened.

Since the processing in the cell detection circuit 104 and the cell monitoring circuit 105 is the same as in the above embodiment, description thereof is omitted. In addition, cell detection and cell monitoring are performed in the same manner as in the first embodiment.

As described above, the communication terminal apparatus according to the present embodiment can control the frequency of cell detection and cell monitoring dynamically according to the service information or the spreading rate information, so that the communication time and the reception waiting time can be increased by saving the power consumption as much as possible. have. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

(Example 7)

In this embodiment, the cell error is monitored by monitoring the bit error rate (BER), cyclic redundancy check (CRC), and block error rate (BLER) of the signal currently being communicated. The case where the period of cell detection is shortened is demonstrated.

11 is a block diagram showing the construction of a communication terminal apparatus according to Embodiment 7 of the present invention. In FIG. 11, the same code | symbol as FIG. 1 is attached | subjected about the same part as FIG. 1, and the detailed description is abbreviate | omitted.

The communication terminal device shown in FIG. 11 includes a decoding circuit 1101 for decoding the signal of the demodulation circuit 109. This decoding circuit 1101 also exists for the communication terminal apparatus according to the above embodiment, but the description is omitted for simplicity.

The decoding circuit 1101 measures BER, CRC, and BLER with respect to the received signal, and transmits an instruction to the management circuit 107 for changing the cycle of cell detection and cell monitoring based on the measurement result. The management circuit 107 transmits a control signal of the contents of the cell detection and cell monitoring to the cell detection circuit 104 and / or the cell monitoring circuit 105 at a changed cycle. Thereby, cell detection and cell monitoring are performed at the changed cycle.

Next, the cycle control of cell detection and cell monitoring of the communication terminal device having the above configuration will be described.

In the correlation circuit 103, a despreading process is performed on the received signal to obtain a correlation value. This correlation value is transmitted to the cell detection circuit 104 and the cell monitoring circuit 105 and also to the demodulation circuit 109.

In the demodulation circuit 109, demodulation processing is performed on the signal after despreading, and the signal is transmitted to the decoding circuit 1101. The decoding circuit 1101 decodes the signal after the demodulation process, measures BER, CRC, and BLER, and performs threshold determination, for example, on the measured values of BER, CRC, and BLER. As a result, for example, when the predetermined threshold is abnormal, the quality of the received signal is deteriorated, and the control signal is transmitted to the management circuit 107 for shortening the period of cell monitoring or cell detection. The management circuit 107 changes the cycle of cell detection or cell monitoring in accordance with the control signal, and gives the cell detection circuit 104 or the cell monitoring circuit 105 an instruction of the contents of the cell detection or cell monitoring in the cycle. Run

Since the processing in the cell detection circuit 104 and the cell monitoring circuit 105 is the same as in the above embodiment, description thereof is omitted. In addition, cell detection and cell monitoring are performed in the same manner as in the first embodiment.

As described above, the communication terminal apparatus according to the present embodiment dynamically controls the frequency of cell detection and cell monitoring in accordance with the BER, CRC, and BLER after decoding, and saves power consumption as much as possible to prolong the talk time and reception wait time. can do. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

(Example 8)

In the present embodiment, a case where the period of cell monitoring or cell detection is shortened by using the selection mode information as an event will be described.

12 is a block diagram showing the construction of a communication terminal apparatus according to Embodiment 8 of the present invention. In FIG. 12, the same code | symbol as FIG. 1 is attached | subjected about the same part as FIG. 1, and the detailed description is abbreviate | omitted.

The communication terminal device shown in FIG. 12 is configured to input selection mode information into the management circuit 107. The management circuit 107 transmits a control signal of the content of cell detection and cell monitoring to the cell detection circuit 104 and / or the cell monitoring circuit 105 in accordance with the selection mode information. Thereby, cell detection and cell monitoring are performed at the changed cycle.

The selection mode information is, for example, mode information by a selection switch for low power consumption and high quality. Accordingly, the user can select the control according to the event to the cycle of cell detection or cell monitoring as necessary.

That is, the management circuit 107 controls the cell detection and the cell monitoring according to the event described in the above embodiment when receiving the control signal of turning on the control of the present invention by the selection switch in order to achieve low power consumption. . In addition, when the user receives a control signal for turning off the control of the present invention by the selection switch in order to request high quality, cell detection and cell monitoring are performed at a normal cycle.

Since the processing in the cell detection circuit 104 and the cell monitoring circuit 105 is the same as in the above embodiment, description thereof is omitted. In addition, cell detection and cell monitoring are performed in the same manner as in the first embodiment.

As described above, the communication terminal apparatus according to the present embodiment can dynamically control the frequency of cell detection and cell monitoring according to the selection mode information, so as to save the power consumption as much as possible to increase the talk time and reception wait time. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

For example, in a dual device, when the cell candidates of other systems (CSM, PDC, PHS, etc.) are known, the information can be used to control the present invention. In other words, the cell candidates of other systems can be used to reduce the frequency of cell detection and cell monitoring of the present system. This is effective when monitoring another system during the transmission stop period in the compression mode.

Also, if you are connected to another service operator and are at the boundary between other service operators and your own service operator, for example between the service operator who needs to roam and your service operator, your service as soon as possible. The frequency of cell detection and cell monitoring is made high so that an operator can return. This makes it possible to reduce the call charges.

The said Examples 1-8 can be implemented in combination suitably.

This invention is not limited to the said Examples 1-8, It can change and implement variously.

The communication terminal apparatus of the present invention includes a cell detection unit that performs cell detection based on a result of correlation calculation processing performed on a received signal using a spreading code used on the transmission side, and cell monitoring using the result of the correlation calculation processing. And a cell management table which classifies and manages each base station based on the result of the cell detection and the result of the cell monitoring, and a management unit that controls the period of cell detection and / or cell monitoring according to an event. Adopt a configuration.

According to this configuration, it is possible to dynamically control the frequency of cell detection and cell monitoring according to various events, to save the power consumption as much as possible and to increase the talk time and reception wait time. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

In the above configuration, the communication terminal apparatus of the present invention employs a configuration in which the management section controls the period of cell detection and / or cell monitoring by the level of the signal from the base station managed in the cell management table or the number of base stations. do.

In the above configuration, the communication terminal apparatus of the present invention includes a monitoring unit that monitors the reception quality for each finger by using the correlation calculation result, and the management unit controls the period of cell detection and / or cell monitoring based on the reception quality. We adopt constitution to make.

In the above configuration, the communication terminal apparatus of the present invention includes a gain control unit for controlling the gain of the received signal, and the management unit adopts a configuration for controlling the period of cell detection and / or cell monitoring based on the gain information of the received signal. do.

In the above configuration, the communication terminal apparatus of the present invention includes a measuring unit that measures a moving speed or an altitude from a received signal, and the management unit performs a period of cell detection and / or cell monitoring based on a result of the measuring of the moving speed or altitude. A configuration to control is adopted.

In the above configuration, the communication terminal apparatus includes a configuration in which the management unit controls the period of cell detection and / or cell monitoring by at least one selected from the group consisting of external power information, service information, spreading rate information, and error rate information. Adopt.

According to these configurations, the frequency of cell detection and cell monitoring can be controlled by various events to save power consumption as much as possible and increase the talk time and reception wait time.

The base station apparatus of the present invention is characterized by performing wireless communication with the communication terminal apparatus. As a result, handover can be performed without interruption and maintaining a predetermined communication quality.

The wireless communication method of the present invention is a cell detection step of performing cell detection based on a result of a correlation calculation process performed on a received signal using a spreading code used on a transmission side, and cell monitoring using the result of the correlation calculation process. A cell monitoring step of performing cell detection, a management step of classifying and managing each base station based on the cell detection result and the cell monitoring result, and a control step of controlling a cycle of cell detection and / or cell monitoring according to an event. do.

According to this method, the frequency of cell detection and cell monitoring can be dynamically controlled in accordance with various events, so that power consumption and standby time can be increased by saving power consumption as much as possible. In addition, since cell management in cell detection and cell monitoring can be accurately executed in real time, handover can be surely performed and communication quality at handover can be maintained.

As described above, the communication terminal apparatus of the present invention dynamically controls the frequency of cell detection and cell monitoring based on various factors (events), and thus reduces the power consumption as much as possible, thus saving talk time and reception waiting time. Can be long. In addition, since cell management in cell detection and cell monitoring can be executed accurately in real time, handover can be surely performed and communication quality during handover can be maintained.

This specification is based on Japanese Patent Application No. 11-353672 for which it applied on December 13, 1999. All of this is included here.

The present invention can be applied to a communication terminal device and a wireless communication method in a digital wireless communication system.

Claims (8)

Cell detection means for performing cell detection based on the result of the correlation calculation process performed on the received signal using the spreading code used on the transmission side; Cell monitoring means for performing cell monitoring, which is a process of measuring a level of a signal from a cell detected base station; A cell management table for classifying and managing each base station based on the level of a signal from the base station; Management means for controlling a cycle of cell detection and / or cell monitoring based on the information in the cell management table Communication terminal device having a. The method of claim 1, The cell management table is a communication terminal device for classifying and managing a cell-detected base station into any one of a base station currently communicating, a base station that is a candidate for handover, and other base stations. The method of claim 2, The management means shortens the cycle of cell monitoring when the number of base stations currently communicating is less than the first predetermined threshold. The method of claim 3, wherein The management means is a communication for shortening the period of cell detection and / or cell monitoring when the number of base stations currently communicating is below a predetermined first threshold and the number of base stations that are candidates for handover is below a predetermined second threshold. Terminal device. As a communication terminal device that can be used for a plurality of systems, Cell detection means for performing cell detection based on the result of the correlation calculation process performed on the received signal using the spreading code used on the transmission side; Cell monitoring means for performing cell monitoring, which is a process of measuring a level of a signal from a cell detected base station; A cell management table for classifying and managing each base station based on the level of a signal from the base station; Management means for controlling a cycle of cell detection and / or cell monitoring based on the information in the cell management table Provided with And said management means shortens the cycle of cell detection and / or cell monitoring when a cell candidate of another system is taken. The method of claim 5, wherein The management means connects to another service operator, and when it is at the boundary between another service operator and its own service operator, the communication terminal apparatus shortens the cycle of cell detection and / or cell monitoring. delete A cell detection step of performing cell detection based on the result of the correlation calculation process performed on the received signal using the spreading code used on the transmission side; A cell monitoring step of performing cell monitoring, which is a process of measuring a level of a signal from a cell detected base station; A management process of classifying each base station based on the signal level from the base station and managing the base station in a cell management table; A control step of controlling a cycle of cell detection and / or cell monitoring based on the number of base stations classified by the information in the cell management table Wireless communication method comprising a.