JPH09153857A - Radio telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system which can suppress the rise of a frame error rate and can suppress excessive battery consumption. SOLUTION: When a call signal 12 or 13 except for the last call signal 14 among the same call signals 12, 13 and 14 which a base station transmits on the simultaneous call channel p1 of a down call channel 9 for plural times cannot be received by more than prescribed quality, the other call signal 13 or 14 appearing after the call signal 12 or 13 is received again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless telephone device which is connected to a base station of a portable telephone or a base unit of a cordless telephone by a wireless line.

[0002]

2. Description of the Related Art In recent years, as a wireless telephone system such as a portable telephone or a cordless telephone, an increasing number of apparatuses perform communication by a time division multiple access (hereinafter abbreviated as TDMA) system.

A conventional radio telephone system such as a portable telephone system which performs communication by the TDMA system, and a battery saving system in a standby reception state of a radio telephone device in the radio telephone system will be described below with reference to the drawings. .

FIG. 9 shows a standard specification RCR STD-28 (hereinafter referred to as RCRP)
In a personal handyphone system (generally referred to as PHS) defined by the HS standard), a configuration of a slot used by a base station and a logical control channel in the slot (hereinafter abbreviated as LCCH) 3 shows a method of configuring the above.

In FIG. 9, reference numeral 1 is a specific example of slots used by a base station. One TDMA frame is composed of four transmission slots and four reception slots, and the first slot of the TDMA frame is assigned as an LCCH. Here is an example. 2 and 3 are LCCHs for the radiotelephone devices in the standby state, and 2 is an uplink L received by the base station.
CCH, and 3 is a downlink LCCH transmitted by the base station. In the downlink LCCH3, one TDMA frame constitutes one downlink intermittent transmission cycle for i times, and further, a downlink intermittent transmission cycle constitutes j cycles for an LCCH superframe.

FIG. 10 shows an example of the relationship between the downlink LCCH slot configuration of the base station and the reception state of the wireless telephone device. In FIG. 10, 4 is a configuration example of the downlink LCCH transmitted by the base station, and BC is a broadcast channel (hereinafter abbreviated as BCCH) for broadcasting control information, P
1 to P4 are point-to-multipoint paging channels (hereinafter abbreviated as PCH) that transfer the same information to the paging area all at once, and SC is information necessary for call connection between the base station and the wireless telephone device. Is a point-to-point dedicated cell channel (hereinafter abbreviated as SCCH).

The radiotelephone device which is a mobile station receives the BCCH when the power is turned on for the first time. After that, in the waiting state for incoming and outgoing calls, one of the PCHs (for example, P1) is received, and during the rest of the time, only the part that controls the time in the wireless telephone device operates, and the other parts are in the power off state. age,
It reduces battery consumption.

In a radio telephone system such as a mobile telephone system, the base station may transmit the same signal a plurality of times in the paging channel of the downlink LCCH in order to further reduce the battery consumption of the radio telephone device. In FIG. 10, the case of transmitting N times is given as an example.

In 5 to 8, the PCH in the LCCH is P1
In the case of, the wireless telephone device can show the possible reception states, 5 is a state in which reception is performed every time regardless of a plurality of same signals, and 6 is the first signal out of a plurality of same signals transmitted. Indicates a state where 7 is receiving the nth signal of the same signals transmitted, and 8 indicates a state of receiving the Nth signal of the same signals transmitted, that is, the last signal. There is.

In this case, the wireless telephone device, which is a mobile station,
The normal state, which is the reception state 5 in which all the signals of the same signal are received from the signal transmitted from the base station, or the reception state in which only the first signal is received in order to suppress battery consumption 6, ... Receiving in the battery save mode, which is one of the receiving states 7 of receiving only the nth signal, 7 ... receiving 8 of only the Nth signal.

Further, a signal in a certain fixed section is set as one frame, the base station on the transmission side adds an error detection code for error detection for each frame, and the wireless telephone device on the reception side,
The frame error rate is measured by performing error detection for each frame based on the error detection code from the transmitting side. further,
The wireless telephone device uses the electric field strength (hereinafter, RSSI) of the received signal.
Abbreviated as “).

[0012]

However, in the conventional radiotelephone device as described above, when the radiotelephone device is in the battery save mode as shown in the receiving states 6 to 8 of FIG. 10, that is, the base station is Same P being sent multiple times
In a receiving state in which only one of the CHs is received, if there is a frame error in the received signal, there is a problem that the call signal from the base station is missed.

Further, as shown in the reception state 5 of FIG. 10, the radio telephone device concerned has a plurality of identical Ps being transmitted from the base station.
Even if the frame error rate becomes low during reception in the intermittent reception state, which is the normal mode for receiving all CH signals, the transition to the battery save mode in which the number of receptions for the same PCH signal is small was not performed, It also had a problem of causing extra power consumption of the battery.

The present invention solves the above problems,
(EN) Provided is a wireless telephone device capable of preventing reception omission in response to a call signal from a base station and suppressing extra power consumption of a battery.

[0015]

In order to solve the above-mentioned problems, in a radio telephone device according to claim 1 of the present invention, a base station transmits a plurality of times on a downlink control channel which is its paging channel. A radiotelephone device that receives a signal other than the last one of the same call signals, and if the call signal cannot be received with a certain reception quality or higher, control is performed to re-receive the call signal that appears after that. The control unit is configured to operate.

According to this configuration, when a plurality of the same signals being transmitted from the base station are being received in the battery save mode and a frame error occurs in the received signals, the other same signals which are not normally received are re-received. By performing reception, the power consumption of the battery is suppressed and the increase in frame error rate is suppressed.

According to a second aspect of the present invention, there is provided a radio telephone device according to the first aspect, in which the control unit of the first aspect is in a battery save mode in which the base station receives any one of the same call signals transmitted a plurality of times. When the frame error rate of the received call signal exceeds a certain value, the reception state is controlled to be switched to the normal mode in which the same call signal is received every time.

According to a third aspect of the present invention, there is provided a radio telephone device according to the first aspect, in which the control unit according to the first aspect is in a battery save mode in which the base station receives any one of the same call signals transmitted a plurality of times. When the signal strength of the received signal falls below a certain value for a certain number of times, the reception state is switched to the normal mode.

According to the configurations of claims 2 and 3, when a plurality of the same signals being transmitted from the base station are being received in the battery save mode and the reception quality of the received signals is deteriorated, the battery is saved. By switching the reception mode from the normal mode to the normal mode, the power consumption of the battery is suppressed as a whole and the increase of the frame error rate is suppressed.

According to a fourth aspect of the present invention, in the radio telephone device according to the first aspect, when the control unit of the first aspect receives the same call signal transmitted by the base station a plurality of times each time, the call signal has a certain reception quality or more. If the signal cannot be received in step 1, the control is switched to the battery save mode in which the signal having the lowest frame error rate among the plurality of identical call signals is received.

According to a fifth aspect of the present invention, in the radio telephone device according to the first aspect, when the control unit of the first aspect is in the normal mode in which the same call signal transmitted by the base station a plurality of times is received each time, the signal strength of the received signal has a certain value. When the number of times exceeds the certain number of times continues for a certain number of times, it is configured to control to switch to the battery save mode in which the signal having the highest signal strength among the plurality of identical call signals is received.

According to the configurations of claims 4 and 5, while receiving a plurality of the same signals being transmitted from the base station in the battery save mode, the reception of the battery save mode is performed according to the reception quality of the received signals. The timing is switched to the timing at which the signal that gives the best reception quality among the plurality of identical signals is received.

According to a sixth aspect of the present invention, in the radio telephone device, when the control unit of the fourth or fifth aspect switches the reception state to the battery save mode, the base station transmits the same call signal a plurality of times. The reception state for the last signal is configured to be controlled so that the switching is prohibited.

According to this configuration, by the operations of the fourth and fifth aspects, even when the battery save mode is switched to the reception timing at which the frame error rate is further lowered, the last signal of the plurality of the same signals is changed. Switching to the battery save mode is prohibited only during reception, and re-reception is performed when a frame error occurs in the received signal, thus suppressing an increase in frame error rate even after shifting to the battery save mode.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION A wireless telephone device showing an embodiment of the present invention will be described below with reference to the drawings.

The wireless telephone device according to the first embodiment will be described. FIG. 1 is a specific example showing a reception state of a transmission slot from a base station in the wireless telephone device of the first embodiment. Here, the number of repetitions of the same call signal from the base station is 3 (N = 3), and the received signal of the wireless telephone device is the first signal (n = 1).

In FIG. 1, reference numeral 9 is a downlink LCCH of a base station that transmits radio waves to a radio telephone device. This channel configuration is a specific example for explaining the present embodiment. 10
Shows the reception state in the wireless telephone device when the downlink LCCH 9 is (N = 3). 11-
15 is a PCH for a mobile station, among which 1
2 to 14 are the same PCH.

FIG. 2 is a flow chart showing the flow of control by the control unit in the wireless telephone device of the first embodiment. The control unit of the wireless telephone device controls the wireless telephone device as follows according to the flowchart shown in FIG.
As in the downlink LCCH 9 shown in FIG. 1, when the base station transmits the same call signals 12, 13, and 14 three times, the radio telephone device calls the first (n = 1) call signal 1.
2 is received (step # 1). Frame detection is performed on the received call signal 12, and it is determined whether or not there is an error in the frame (step # 2). In step # 2, if there is no frame error, the next first signal 15 is received. If the frame is incorrect,
The wireless telephone device re-receives the second (n = 2) identical signal 13 (step # 3) and detects the received signal (step # 4).

By the above operation, it is possible to suppress the increase of the frame error rate while suppressing the power consumption of the battery. A wireless telephone device according to the second embodiment will be described.

FIG. 3 is a flow chart showing the control during communication with the base station by the control unit in the wireless telephone device of the second embodiment. The control unit of the wireless telephone device controls the wireless telephone device as follows according to the flowchart shown in FIG. When the base station is transmitting the same signal multiple times to save the battery of the wireless telephone device, the wireless telephone device is in the battery save mode and receives the nth signal of the plurality of the same signals. (Step # 5). The radiotelephone device performs frame detection on the received signal and measures the frame error rate (step # 6). If the frame error rate is less than or equal to a predetermined value x%, reception is continued in the battery save mode of step # 5. If the frame error rate exceeds x%, the mode is changed to the normal mode in which the wireless pattern of the wireless telephone device is received every time (step # 7).

By the above operation, it is possible to prevent the frame error rate from increasing even when the reception condition deteriorates. A wireless telephone device according to the third embodiment will be described.

FIG. 4 is a flow chart showing the control during communication with the base station by the control unit in the wireless telephone device of the third embodiment. The control unit of the wireless telephone device controls the wireless telephone device as follows according to the flowchart shown in FIG. When the base station is transmitting the same signal multiple times to save the battery of the wireless telephone device, the wireless telephone device is in the battery save mode and receives the nth signal of the plurality of the same signals. (Step # 8). The wireless telephone device measures the RSSI of the received signal (step # 9). If the RSSI is greater than or equal to a predetermined value, the reception is continued in the battery save mode of step # 8. If the RSSI is less than a certain value, the number of times is counted (step # 10), and when a certain number of times m continues, the wireless pattern of the wireless telephone device is changed to the normal mode in which it is received every time (step # 11). If it is less than a certain number of times m, reception is continued in the battery save mode of step # 8.

By the above operation, even when the electric field strength becomes weak, it is possible to prevent the frame error rate from increasing due to the weak electric field strength. A wireless telephone device according to the fourth embodiment will be described.

FIG. 5 is a concrete example showing the reception state of the transmission slot from the base station in the radio telephone apparatus of the fourth embodiment. Here, the number of repetitions of the same call signal from the base station is 3 (N = 3).

In FIG. 5, reference numeral 16 is a downlink LCCH of a base station which transmits radio waves to the radio telephone device. This channel configuration is a specific example for explaining the present embodiment. 1
Reference numerals 7 and 18 show two of the possible reception states of the wireless telephone device when the downlink LCCH 16 is (N = 3), and 17 is a normal mode in which the reception state is obtained every time. Is a battery save mode in which a second (n = 2) signal is received.

FIG. 6 is a flow chart showing the flow of control by the control unit in the wireless telephone device of the fourth embodiment. The control unit of the wireless telephone device controls the wireless telephone device as follows according to the flowchart shown in FIG.
As shown in FIG. 5, when the wireless telephone device is in the normal mode 17 in which it is in the receiving state of receiving every time (step # 1
2) The frame error in the received signal is detected and the frame error rate of each of the first, second and third signals is measured (step # 13). In each measurement, when the frame error rate is equal to or higher than a predetermined value y%, the next signal is received in the “receive every time” state of step # 12. In each measurement, if the frame error rate is less than y%, the signal with the lowest frame error rate among the first, second, and third signals, for example, the second signal among the three identical signals, is the most If the signal has a low frame error rate, the second signal is selected (step # 14), the reception state for receiving the nth signal is switched to, and the battery save mode 18 is entered (step # 15).

With the above operation, when the frame error rate becomes low when the receiving state of the wireless telephone device is always receiving, it is possible to automatically shift to the battery save mode and suppress the power consumption of the battery. be able to.

A wireless telephone device according to the fifth embodiment will be described. FIG. 5 is also a specific example showing the reception state of the transmission slot from the base station in the wireless telephone device of the fifth embodiment. This specific example is the same as in the case of the wireless telephone device of the fourth embodiment, so description thereof will be omitted here.

FIG. 7 is a flow chart showing the flow of control by the control unit in the wireless telephone device of the fifth embodiment. The control unit of the wireless telephone device controls the wireless telephone device as follows according to the flowchart shown in FIG. 7.
As shown in FIG. 5, when the wireless telephone device is in the normal mode 17 in which it is in the receiving state of receiving every time (step # 1
6) The frame error in the received signal is detected, and the RSSI of each of the first, second, and third signals is measured (step # 17). If the RSSI is less than or equal to a predetermined value, the next signal is received in the “receive every time” state of step # 16. If the RSSI exceeds a certain value, the number of times the RSSI is exceeded is counted (step # 1.
8). If the number of consecutive times is less than a certain number k, step #
The next signal is received in the 16 "Receive every time" state. If it is the kth number of times, the signal with the largest RSSI value is selected from the first, second, and third signals (step # 19), and the battery is saved by switching to the reception state for receiving the nth signal. The mode shifts to mode 18 (step # 20).

By the above operation, when the reception state of the radiotelephone device is "reception every time" and the RSSI value becomes large, it is possible to automatically shift to the battery save mode and to reduce the power consumption of the battery. Can be suppressed.

A wireless telephone device according to the sixth embodiment will be described. FIG. 8 is a specific example showing a reception state of a transmission slot from a base station in the wireless telephone device of the sixth embodiment. Here, the number of repetitions of the same call signal from the base station is 3 (N = 3) N is 3.

In FIG. 8, reference numeral 19 is a downlink LCCH of a base station that transmits radio waves to the radio telephone device. This channel configuration is a specific example for explaining the present embodiment. 2
0 to 23 show possible reception states of the wireless telephone device when the downlink LCCH 19 is (N = 3), and 20 is a normal mode in which the reception state is obtained every time, and 21
Is a battery save mode in which only the first signal is received, 22 is a battery save mode in which only the second signal is received, and 23 is a battery save mode in which only the third signal is received Is. The wireless telephone device is a downlink LC of the base station.
When the number of repetitions of the same signal on CH19 is 3 (N = 3), the reception state of any of 20 to 23 is entered.

The control unit of the radiotelephone device controls the radiotelephone device as follows in accordance with the concrete example of the reception state shown in FIG. The radiotelephone device is for some reason, for example,
For the reason described above with respect to the wireless telephone device of the sixth embodiment, when the reception state is switched from the normal mode 20 of "reception every time" to the battery save mode 21, the last signal of the three same signals is used. Reception, that is 3
Battery save mode 2 to receive the second signal
Switching is prohibited for 3 and signal reception other than the last,
That is, either the battery save mode 21 in which the first signal is received or the battery save mode 22 in which the second signal is received is switched.

By the above operation, when the reception state of the radio telephone device is switched to the battery save mode, the last signal of the plurality of same signals is prohibited from being switched, which has been described in the first embodiment. Such re-reception can be performed, and the increase in frame error rate can be suppressed even after shifting to the battery save mode.

[0045]

As described above, according to the present invention, when a plurality of the same signals being transmitted from the base station are being received in the battery save mode and a frame error occurs in the received signals, the normal reception is performed. By re-receiving the same signal other than the above, it is possible to suppress the increase in the frame error rate while suppressing the power consumption of the battery.

Further, when a plurality of the same signals being transmitted from the base station are being received in the battery save mode and the reception quality of the received signals deteriorates, the reception mode is switched from the battery save mode to the normal mode. By doing so, it is possible to suppress an increase in the frame error rate while suppressing the power consumption of the battery as a whole.

Further, while receiving a plurality of same signals being transmitted from the base station in the battery save mode, the reception timing of the battery save mode is set to the best of the plurality of same signals according to the reception quality of the received signals. Even if you switch to the battery save mode at the reception timing when the signal with which the reception quality is obtained is switched to the timing to receive and the frame error rate becomes even lower, the battery is only used when the last signal of the same signal is received. By prohibiting switching to the save mode and performing re-reception when a frame error occurs in the received signal, it is possible to suppress an increase in the frame error rate even after shifting to the battery save mode.

As a result of the above, it is possible to prevent the omission of reception of the calling signal from the base station and to suppress the extra power consumption of the battery.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a reception state of a wireless telephone device according to a first embodiment of this invention.

FIG. 2 is a flowchart showing control in the same embodiment.

FIG. 3 is a flowchart showing control of the wireless telephone device according to the second embodiment of the present invention.

FIG. 4 is a flowchart showing control of the wireless telephone device according to the third embodiment of the present invention.

FIG. 5 is an explanatory diagram of a reception state of the wireless telephone device according to the fourth and fifth embodiments of the present invention.

FIG. 6 is a flowchart showing control of the wireless telephone device according to the fourth embodiment of the present invention.

FIG. 7 is a flowchart showing control of the wireless telephone device according to the fifth embodiment of the present invention.

FIG. 8 is an explanatory diagram of a reception state of the wireless telephone device according to the sixth embodiment of the present invention.

FIG. 9 is an explanatory diagram of a slot configuration in a conventional base station.

FIG. 10 is an explanatory diagram of a reception state of a conventional wireless telephone device.

[Explanation of symbols]

10, 17, 18, 20, 21, 22, 23 Radio telephone device reception status

Claims (6)

[Claims] 1. A radiotelephone device in which a base station receives a signal other than the last of the same call signal transmitted a plurality of times on its downlink control channel, which is the paging channel, and the call signal is received constantly. A radiotelephone device comprising a control unit for controlling to re-receive the call signal appearing after that when the signal cannot be received at a quality or higher. 2. The controller controls the frame error rate of the received call signal to be a constant value when the battery save mode is a reception state in which the base station receives any one of the same call signals transmitted a plurality of times. The radiotelephone device according to claim 1, wherein, when it exceeds, the reception state is controlled so as to be switched to a normal mode in which the same call signal is received every time. 3. The number of times the signal strength of the received signal falls below a certain value in the battery save mode in which the control unit is in a receiving state of receiving one of the same call signals transmitted by the base station a plurality of times. The radiotelephone device according to claim 1, wherein the reception state is controlled to switch to the normal mode after a certain number of consecutive times. 4. The control unit, in the normal mode in which the base station receives the same call signal transmitted a plurality of times each time, when the call signal cannot be received with a certain reception quality or more, the plurality of the same call signals are received. The control for switching to a battery save mode for receiving a signal having the lowest frame error rate among the calling signals.
The wireless telephone device as described in. 5. When the control unit is in a normal mode in which the same call signal transmitted from a base station a plurality of times is received each time, and the signal strength of the received signal exceeds a certain value for a certain number of times, The control for switching to a battery save mode for receiving a signal having the highest signal strength of the same call signal.
The wireless telephone device as described in. 6. The control unit controls, when switching the reception state to the battery save mode, the reception state for the last signal of the same call signals transmitted by the base station a plurality of times so as to prohibit the switching. The wireless telephone device according to claim 4 or 5, configured as described above.