JP2002290328A - Transmission power controller and mobile wireless unit mounted with the transmission power controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the occurrence of unnecessary power transmission causing a disturbing wave to other mobile wireless units when an outgoing channel is interrupted due to any cause. SOLUTION: In the transmission power controller that receives an outgoing signal from a base station to control its own transmission power on the basis of transmission power control information included in the outgoing signal, a CRC decode section 104 detects the presence of abnormity of the outgoing signal through CRC checking, outputs a control command to a gain control section 106 when discriminating the presence of abnormity, and inhibits increase of its own transmission power independently of a transmission gain decided by a conversion means 103 on the basis of the transmission power control information included in the received signal. Thus, unnecessary transmission of high power can be avoided and production of disturbing and interference waves can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control device for a mobile radio device in radio communication, and more particularly to a transmission power control device suitable for reducing an interference wave output from the mobile radio device and the transmission power control device. The present invention relates to a mobile radio equipped with a device.

[0002]

2. Description of the Related Art Communication (call) between a base station and a mobile radio device
Conventionally, to determine the disconnection, the CP
U is a CRC (Cyclic Red) encoded in slot units.
undancy check character), and when it is determined that an error has occurred in the CRC and communication has been disconnected, the output of the transmission power control device is stopped. However, on the other hand, the mobile wireless device is provided with a function of disconnecting the communication after waiting a few frames even when the CPU determines that the communication has been disconnected so that the communication once connected is not easily cut off.
For this reason, the conventional mobile wireless device detects a communication disconnection and then transmits a transmission power control bit (hereinafter referred to as TPC (Transmitting Power Down).
er Control) bit. ) Until you control
It takes time for several frames.

[0003]

In the conventional transmission power control apparatus, when the base station stops the downlink, or when the mobile radio cannot receive the downlink due to an external environmental factor, the TPC bit is incorrect. It may look like "11" which is the transmission power increase command. In this case, the upper layer performs a process of stopping transmission because the control signal cannot be exchanged between the mobile radio device and the base station. Unnecessary power transmission for about several seconds is performed during this process. This unnecessary power transmission has no problem as long as its power level is small. However, if the TPC bit looks erroneously as "11" as described above, control to increase the transmission power proceeds, and this unnecessary power transmission is performed. It becomes an interference wave (interference wave) to other mobile radio devices, and in the worst case, there is a possibility that the call of the other mobile radio device will be disconnected.

[0004] The present invention has been made in view of the above-mentioned problems of the prior art, and reduces unnecessary power transmission, which becomes an interference wave for other mobile radio equipment when a downlink is interrupted for some reason. It is an object of the present invention to provide a transmission power control device and a mobile radio device equipped with the transmission power control device.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a mobile radio transmission power control apparatus for receiving a downlink signal from a base station and controlling its own transmission power based on transmission power control information contained in the downlink signal. In the above, it is achieved by providing a control means for prohibiting an increase in its own transmission power irrespective of the transmission power control information when the presence or absence of an abnormality in the downlink signal is detected and it is determined that there is an abnormality.

In the above, preferably, the presence or absence of an abnormality in the downlink signal is detected from a reception state of a CRC, a system frame number (SFN) or a pilot symbol included in the downlink signal, and the transmission power control is performed. When the base station transmits a parity bit generated from information to the mobile radio device by inserting it into the downlink signal, the presence or absence of an abnormality in the downlink signal is detected by the parity bit. Furthermore, the control means fixes the transmission power to the transmission level before determining that there is an abnormality when determining that there is the abnormality.

[0007] Even if a function of maintaining connection for several frames from the detection of communication disconnection is installed so that a line once connected is not easily disconnected, as in the present invention, an abnormality is detected in a downlink signal. By immediately prohibiting an increase in the transmission power level when it is determined that the communication has been disconnected and detected, it is possible to prevent the transmission of interference waves and interference waves that harm the surroundings.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block configuration diagram of the transmission power control device according to the first embodiment of the present invention. Figure 1
, A transmission power control device 001 of a mobile radio device that performs radio communication with a base station (not shown) includes a TPC decoding unit (TC) that decodes a TPC bit received from the base station.
PC DEC) 101 and T for soft-decision of TPC bits (not for hard decision after conversion to digital code, but for analog signal state before conversion to digital code)
PC determining section 102, TPC converting section 103 for converting the determination result of TPC determining section 102 into a transmission power control amount, CRC determining section (CRC DEC) 104 for performing CRC determination in a received signal on a frame basis, and base station Transmitting section 105 for transmitting the data to CRC determining section 104 and TP
And a gain control unit 106 that is determined based on information of the C conversion unit 103.

FIG. 2 is a flowchart showing an operation procedure of the transmission power control device shown in FIG. This transmission power control device receives information transmitted wirelessly from the outside (FIG. 8 shows a configuration of a frame and a slot of a signal to be wirelessly communicated) and includes the information in the received despread data. The TPC bit to be decoded is decoded by the TPC decoder unit (step S101), and is judged by the TPC judgment unit (step S101).
102), if the contents of the TPC bit are the transmission power increase command “11” in the TPC conversion unit, the conversion is performed as +1 dB, and if the transmission power reduction command is “00”, the conversion is performed as −1 dB (step S103).

[0010] The CRC determination unit performs a CRC determination of the received data on a frame basis (step S104). If the determination result indicates that there is no error in the CRC, the gain control unit determines the conversion result of the TPC conversion unit. (“11” → + 1d
B, “00” → −1 dB) to perform gain control (step S106), and transmit data to the outside.

According to the determination in step S104, the CRC
If it is determined that there is an error in the TPC conversion result, the gain control unit performs gain control using the transmission gain value before the error occurred in the CRC determination result without using the TPC conversion result (step S105), transmitting to the outside.

Thus, when the downlink is normal,
If the TPC bit is “11”, the mobile radio increases the transmission power. However, if the TPC bit is “11”, the transmission power control device on the mobile radio sets Since the increase in the transmission power is prohibited, it is possible to avoid a situation in which the level of unnecessary power transmission output for several seconds after the communication is determined to be disconnected and an interference wave is output around the unnecessary power transmission.

In the above description, the TPC bit is "1".
If it is "1", it is +1 dB, and if it is "00", it is -1 dB.
Performing gain conversion as is only an example. this is,
The same applies to the following embodiments.

FIG. 3 is a block diagram of a transmission power control apparatus according to a second embodiment of the present invention. In the transmission power control device of this embodiment, the CRC decoding unit 104 of the transmission power control device shown in FIG. 1 is replaced with an SFN (system frame number) decoding unit 107, and a gain control unit 106
Is controlled by the decoding result of the SFN decoding unit 107, and the other configuration is the same. S
The FN is a signal added to a frame transmitted by the base station to mobile radio devices in the area, and is a signal assigned a different number for each frame. If the SFN cannot be received, it can be determined that an abnormality or the like has occurred in the downlink.

The SFN decoding unit 107 decodes the system frame number of the received signal in frame units. If the decoding result fails, the conversion result (“11” → + 1 dB, “00” → −) 1d
Regardless of B), transmission is performed using the transmission gain value before the SFN decoding failed and using the gain value. As a result, similarly to the first embodiment, it is possible to avoid a situation in which the level of unnecessary power transmission output for several seconds after the communication is determined to be disconnected is erroneously increased.

FIG. 4 is a block diagram of a transmission power control apparatus according to a third embodiment of the present invention. The transmission power control apparatus of this embodiment is configured such that the CRC decoding section 104 of the transmission power control apparatus shown in FIG.
09, except that the gain control unit 106 is controlled based on the determination result of the pilot symbol determination unit, and the other configuration is the same.

In this embodiment, pilot symbol determination section 109 checks the decoding result of pilot symbol synchronization bits of a received signal on a slot basis with a known pilot symbol synchronization bit, and when the result is "error",
Regardless of the TPC conversion result, transmission is performed to the outside using the transmission gain value used before the pilot symbol becomes “error”. As a result, similarly to the first embodiment, it is possible to avoid a situation in which the level of unnecessary power transmission output for several seconds after the communication is determined to be disconnected is erroneously increased.

In the above-described embodiment, the countermeasures against the interference wave transmission only on the mobile radio side are described. However, embodiments for coping with the transmitter side will be described with reference to FIGS. 5, 6, and 7. FIG.

FIG. 5 is a configuration diagram of a transmitter provided on the base station side. The transmitter 002 includes a TPC generation unit 201 to which transmission data is input, and a TP
TPC parity generation means 202 for generating a TPC parity bit 204 when the C bit 203 is generated. The TPC bit 203 and the TPC parity bit 204 are added to the transmission data. still,
The position of the TPC parity bit in the transmission data may be anywhere.

FIG. 6 is a block diagram of a transmission power control device on the mobile radio device side according to a fourth embodiment of the present invention which receives transmission data transmitted from the transmitter of FIG.
The transmission power control device of this embodiment replaces the CRC decoding unit 104 of the transmission power control device of FIG. 1 with a TPC parity check unit 108, and also outputs the determination result of the TPC determination unit 102 to the TPC parity check unit 108, Gain control section 106 to TPC parity check section 1
The only difference is that control is performed based on the check result of step 08, and the other configurations are the same.

FIG. 7 shows a TPC parity check section 108.
FIG. 7 is a detailed configuration diagram of FIG. The TPC parity check unit 108 operates in units of slots of a received signal, and receives a signal from the TPC determination unit 102 in FIG.
A parity generation unit 300 (having the same configuration as the TPC parity generation unit 202 on the transmitter side generates the same parity bit with the same TPC bit), a TPC parity decoding unit 301 that receives a received signal, and A TPC parity determining unit 302 for determining a decoding result of the decoding unit 301;
00 generated parity and TPC parity determination section 302
And a comparison unit 303 for comparing the result of the judgment with the judgment result of the gain control unit 106 shown in FIG.
Is output to

In this embodiment, the transmitter 00 shown in FIG.
2 is the TPC bit 203 generated by the TPC generation unit 201 and the TPC bit 203 generated by the TPC parity generation unit 202.
In the receiver of FIG. 6 which has inserted the PC parity bit 204 into the transmission signal and transmitted the signal, the TPC parity check unit 108 of the receiver of FIG. The TPC parity determination unit 302 (FIG. 7)
Remove 4. On the other hand, the TPC determination unit 102 in FIG.
7 generates a TPC parity bit based on the TPC bit 203, and generates the generated TPC parity bit and the TPC bit transmitted from the transmitter 002.
The comparator 303 compares the parity bit with the parity bit.

If the result of the comparison is a match, there is no abnormality in the communication. Therefore, gain control is performed based on the received TPC bit. If the result of the comparison does not match, it is determined that communication has been disconnected, and the TPC parity bit is determined. The data transmission is performed using the transmission gain value before the mismatch occurs, and the level of unnecessary power transmission output for several seconds after it is determined that the communication has been disconnected may be erroneously increased. To avoid. As described above, by mounting the TPC parity check bit in the transmission data, it is possible to minimize transmission abnormalities.

According to each of the above-described embodiments, when the downlink is interrupted for some reason, the mobile radio detects an error in the reception control information in slot units or frame units. Can be controlled in slot units or frame units, and it is possible to suppress the transmission of interference waves and interference waves to other mobile wireless devices. The processing unit is not limited to the slot unit or the frame unit, but may be an integral multiple of the frame.

[0025]

According to the present invention, an increase in transmission power is prohibited immediately upon detection of a communication interruption, so that it is possible to avoid a situation where transmission power is unnecessarily increased from the time of detection of a communication interruption to the stop of transmission power. , Can be prevented from being transmitted around.

[Brief description of the drawings]

FIG. 1 is a block configuration diagram of a transmission power control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a transmission power control procedure according to the first embodiment of the present invention.

FIG. 3 is a block configuration diagram of a transmission power control device according to a second embodiment of the present invention.

FIG. 4 is a block configuration diagram of a transmission power control device according to a third embodiment of the present invention.

FIG. 5 is a block diagram of a base station side transmitter according to a fourth embodiment of the present invention.

FIG. 6 is a block diagram of a transmission power control device on the receiver side according to a fourth embodiment of the present invention.

FIG. 7 is a detailed block configuration diagram of a TPC parity bit determination unit shown in FIG. 6;

FIG. 8 is a diagram illustrating an example of a configuration of a frame and a slot of a transmission / reception signal.

[Explanation of symbols]

 001 Transmission power control device 002 Base station side transmitter 101 TPC decoding unit 102 TPC judgment unit 103 TPC conversion unit 104 CRC judgment unit 105 Transmission unit 106 Gain control unit 107 System frame number decoding unit 108 TPC parity check unit 109 Pilot symbol judgment unit Reference Signs List 201 TPC generator 202 TPC parity generator 203 TPC bit 204 TPC parity bit 300 TPC parity generator 301 TPC parity bit decoder 302 TPC parity bit determiner 303 Comparator

Continuation of the front page F term (reference) 5K060 CC04 CC11 DD04 LL01 LL25 PP01 5K067 AA03 BB04 DD11 EE02 EE10 GG08 HH25 HH26

Claims (5)

[Claims] 1. A transmission power control device for a mobile radio device, which receives a downlink signal from a base station and controls its own transmission power based on transmission power control information included in the downlink signal, A transmission power control device, comprising: a control unit for prohibiting an increase in its own transmission power irrespective of the transmission power control information when detecting the presence or absence of an abnormality and determining that there is an abnormality. 2. The transmission power control apparatus according to claim 1, wherein the presence or absence of an abnormality in the downlink signal is detected from a reception state of a CRC, a system frame number, or a pilot symbol included in the downlink signal. 3. When the base station transmits a parity bit generated from the transmission power control information to the mobile station by transmitting the parity bit to the mobile radio, the presence / absence of an abnormality in the downstream signal is detected by the parity bit. The transmission power control device according to claim 1, wherein: 4. The control unit according to claim 1, wherein the control unit fixes the transmission power to a transmission level before determining that there is an abnormality when determining that there is an abnormality.
The transmission power control device according to any one of the above. 5. A mobile radio device comprising the transmission power control device according to claim 1.