JPH10210007A - Method and device for radio communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of communication by properly controlling the number of multiplexed channels of radio protocol information in a radio communication equipment which multiplexes data to perform communication. SOLUTION: A modulation circuit 104 is provided which changes the number of multiplexed channels to perform modulation at the time of sending radio protocol information which is to be sent at the time of the start of data transmission following a preamble. Further, a control circuit 101 is provided which manages the error rate of protocol information and the error rate of a data period and changes the number of multiplexed channels of protocol information in accordance with this error rate information and variably controls the transmission power per channel of radio protocol information according with this number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a radio communication apparatus such as spread spectrum communication for multiplexing data.

[0002]

2. Description of the Related Art Conventionally, in spread spectrum communication in which data is multiplexed and transmitted, multiplexed preamble periods used for synchronization acquisition and multiplexed transmission for data transmission and reception are used. And a data transfer period.

[0003] In a data transfer period, a protocol header necessary for wireless communication is included, and the header includes wireless protocol information such as communication station identification information, status information, data length information, and transmission power control information. It is configured to transmit and receive.

[0004]

However, in the above conventional example, since the protocol header is transmitted and received by the same channel multiplex number as the data, if the communication state is poor, the radio protocol information cannot be properly determined. There is a risk that the situation of the partner station cannot be grasped.

[0005] Further, in a system that performs transmission timing control and the like using the wireless protocol information, the communication itself may not be possible due to loss of polling information.

It is an object of the present invention to provide a wireless communication apparatus and a wireless communication method capable of appropriately controlling the number of multiplexed wireless protocol information and improving communication reliability.

[0007]

SUMMARY OF THE INVENTION The present invention provides a modulating means for performing modulation by changing the number of multiplexed channels when transmitting radio protocol information transmitted at the start of data transmission following a preamble, and a radio corresponding to the multiplexed number. Power control means for variably controlling transmission power per channel of protocol information;
Demodulation means for demodulating different multiplexed data, error management means for detecting and storing an error rate of protocol information and an error rate of a data period, and control means for changing the number of multiplexed channels of protocol information according to the error rate information And transmission means for transmitting each error rate to the partner station as protocol data, and analysis means for analyzing the error rate of the partner station.

With such a configuration, the error rate of status information and the like between wireless stations can be improved, and the reception state can be transmitted to the partner station even in the worst case where data communication cannot be performed. Further, since the probability of normal communication of the protocol data can be improved, it is possible to improve the communication state by controlling the transmission power based on the error rate and to improve the communication state by switching the antenna on the transmission side.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the configuration of a wireless communication apparatus according to one embodiment of the present invention. FIGS. 2 and 3 show packets and signals transmitted and received in the present embodiment. FIG.

In FIG. 1, a control circuit 101 controls a wireless unit and generates and analyzes wireless protocol data. An external interface circuit 102 interfaces with an external device. The code generation circuit 103 generates a spread code for modulating and demodulating multiplexed data, and the modulation circuit 104 modulates data in accordance with the number of selected spread codes. An encoder for performing FEC is hereinafter included.

The signal from the modulation circuit 104 is supplied to the mixer 10
The signal is superimposed on the frequency signal of the local oscillator 107 by 6 and transmitted from the antenna 111 via the amplifier 109 and the switch 110.

The demodulation circuit 105 performs a despreading operation by correlating all spread codes assigned to the multiplex channels with the received waves. Further, after further despreading, the error correction of the demodulated data is performed by the FEC unit, and error occurrence information is transmitted to the control unit.

The signal received by the antenna 111 passes through a switch 110 and an amplifier 112, is superimposed on a frequency signal of a local oscillator 114 by a mixer 113, and is further inputted to a synchronization circuit 117 through a band pass filter (BPF) 115 and an amplifier 116. Then, synchronization acquisition and the like are performed, and the data is input to the demodulation circuit 105 and restored to the original multiplexed data by the above-described despreading and the like.

The packet 201 shown in FIG. 2 has a preamble period 202 for performing synchronization acquisition and a protocol data transmission period 203. Also, the internal transmission request signal 2
04 is generated inside the control circuit 101 when only the wireless protocol data as shown in FIG. 2 is transmitted as data. The internal data transmission timing signal 205 is generated after the end of the preamble transmission time. The protocol data 206 is transmitted at the same time as the data transmission timing.

On the other hand, the reception data start signal 207 is a signal indicating the start of the reception data generated by the demodulation circuit 105, and the reception data 208 is output according to the signal timing. Also, the reception data timing signal 2
A timing signal 09 is output from the control circuit 101 and is output to the external interface circuit 102 only when data exists after receiving the protocol data. Therefore, in the case shown in FIG. 2, the reception data timing signal 209 does not turn on.

A packet 210 shown in FIG. 3 includes a preamble period 202 and a protocol data transmission period 203
, A data period 211 is provided.

In this case, the transmission request signal 212 is output from the external interface circuit 102 to the control circuit 101. Then, the data transmission instruction signal 213 is generated by the control circuit 101. The signal 213 is transmitted to the external interface circuit 102 after the protocol data is transmitted from the control circuit 101, and the data is transmitted according to the signal timing. Data 21
Reference numeral 4 in this case includes protocol data and data.

On the other hand, the reception data start signal 215 is a signal indicating the start of the reception data generated by the demodulation circuit 105, and the reception data 216 is output according to the signal timing. Also, the reception data timing signal 2
Reference numeral 17 denotes a timing signal output from the control circuit 101, which is output to the external interface circuit 102 only when data exists after receiving the protocol data. Therefore, in the case shown in FIG.
In response to 1, the reception data timing signal 217 turns on.

Hereinafter, a specific operation will be described.

FIGS. 4 to 6 are flow charts showing the operation of the present embodiment. FIG. 4 shows the operation of the control circuit when the power is turned on, and FIG. 5 shows the operation of the control circuit at the time of transmission. I have. FIG. 6 shows the operation of the control circuit at the time of reception.

First, in FIG. 4, when the power of the communication apparatus is turned on (S1), the control circuit 101 internally transmits a transmission timing signal 204 to perform packet transmission of only protocol data in order to notify power-on. After generating and starting the internal counter for counting the predetermined preamble transmission time, since the signal has not been received yet, the transmission multiplex number of the protocol data is set to half of the multiplex number at the time of data transmission. Then (S2), the transmission of the preamble is instructed (S3), and the time-out of the preamble transmission time is monitored.

In accordance with this signal, code generation circuit 103 outputs one spreading code assigned to the preamble in advance to modulation circuit 104. Modulation circuit 104 receiving this
Transmits a preamble using no transmission data and all transmission power for one spreading code.

When the preamble transmission time detection timer overflows, a protocol data transmission timing signal 205 is generated. This is detected (S4)
First, the control circuit 101 outputs a predetermined multiplex number (for example, 4) for address transmission to the code generation circuit 103, and then sends its own address and broadcast address to the modulation circuit 104. (S
5).

The code generation circuit 103 receiving the multiplexed information
The spreading codes for the four channels are output to the modulation circuit 104, and the modulation circuit 104 receives the spreading codes, divides the transmission power into four equal parts, allocates them to each channel, and multiplexes the address information by four to perform transmission.

When the address transmission is completed, the control circuit 101
Outputs a half number of multiplexes (for example, 8) of the number of multiplexed data to the code generation circuit 103, and then sends out protocol data (S6).

The code generation circuit 103 receiving this generates a spread code for eight channels to the modulation circuit 104 in the same manner as described above and outputs it. Next, the modulation circuit 104 divides the transmission power into eight equal parts, allocates them to each channel, and transmits the protocol data. When the transmission of the protocol information is completed (S7), the control circuit 101 disables the internal transmission timing signal, completes the transmission operation, and holds the reception standby state.

Next, in FIG. 5, when the transmission request signal 212 is output from the external interface 102 to the control circuit 101 (S11), the protocol data is transmitted in the same procedure as described above (S19). When the transmission of the protocol data is completed (S20), the control circuit 1
01 outputs the maximum multiplexing number (for example, 16) to the code generation circuit 103 and sends a data transmission start signal to the external interface circuit 102 (S21).

External interface circuit 1 receiving this
02 starts output of transmission data to the modulation circuit 104. The modulation circuit 104 divides the transmission power into 16 equal parts, allocates them to each channel, and outputs a multiplexed data signal. The modulation circuit 104 performs spread modulation after performing FEC encoding on a series of transmission data excluding the previous preamble.

Thereafter, when the transmission of the data is completed (S22), the control circuit 101 completes the transmission operation and holds the reception standby state.

In such a transmission operation, the control circuit 101 performs an operation of changing the number of multiplexed protocol data channels.

This is done after the preamble transmission instruction (S1
2) Check a flag indicating whether or not the previous protocol data was effectively received by the partner station (S13). If valid reception was not possible by the partner station, an instruction to reduce the number of multiplexed protocol data channels is issued. Is performed and the transmission power per channel is increased and transmitted (S16).

If the previous protocol data has been effectively received by the partner station in S13, the multiplex number is not the maximum (S14), and there is a request to change the multiplex number of the protocol data channel. In this case (S15), an instruction to increase the number of multiplexed protocol data channels is issued (S15).
16). The process of changing the multiplex number will be further described later in relation to the operation on the receiving side.

Next, the receiving operation will be described with reference to FIG.

On the receiving side, first, the receiving standby state (S3
In 1), the preamble 202 is detected (S3).
2), when the preamble 202 is detected and the synchronization acquisition ends (S33), the demodulation circuit 105 performs a correlation operation on all spread codes used for multiplexing and performs demodulation.

When the correlation demodulation is correctly performed, the control circuit 101 sends the received data start timing signal 2
07, and then outputs demodulated reception data 209.
If the demodulation is not performed correctly after the synchronization is established,
The control circuit 101 returns to the reception standby state (S31).

The control circuit 101 having received the reception data start timing signal 207 and the reception data 208 first analyzes the address information (S34), and if the received packet is not addressed to its own station (S35), the demodulation circuit 105 , An operation end signal is sent, and the process returns to the reception standby state (S3).
1).

If the received packet is addressed to the own station, the control circuit 101 analyzes the protocol data (S36), and transmits the channel multiplexing information transmitted from the demodulation circuit and the error rate information (BER information) of the protocol data. And store it together with the transmitting station address (S
37).

If the error rate of the received protocol data is low (S38), a request flag is set to the partner station to reduce the number of multiplexed protocol data at the next transmission (S39). When this flag is set, when performing a transmission operation to the other party indicated by the address, the control circuit 101 issues an instruction to reduce the multiplexing number of the protocol data, thereby And the transmission power is increased (S16 in FIG. 5).

Further, when data is included in the received packet (S40), the control circuit 101 sends a received data timing signal 209 to the external interface 102.
Is output to accumulate the error rate information in the data period (S41). The external interface circuit 102 that has received this signal performs processing until the signal is disabled as correct received data.

The reception data timing signal 209 is disabled when the correlation demodulation operation is completed in the demodulation circuit 105 and the reception data start signal 207 is disabled. When the data reception is completed (S42), the control circuit 101 terminates the reception operation and accumulates the error rate information in the data period and the error rate information in the protocol data period (S43). A request flag for increasing the number of multiplexed channels is set (S44).

When this flag is set, transmission is performed by lowering the transmission power per protocol data channel by the same operation as described above (S16 in FIG. 5).

As described above, according to the present embodiment, in a wireless communication apparatus that performs communication by multiplexing data, an error management means for recognizing and storing an error occurrence state in wireless communication, and an error occurrence state And a modulation means for performing modulation by changing the number of multiplexed channels of the radio protocol information on the basis of the error rate of the status information between the radio stations. To increase the probability of proper communication of protocol data, so that the communication state can be improved by transmission power control based on the error rate,
There is an effect that the communication state can be improved by switching the antenna on the transmission side.

When the condition of the communication channel is good, the maximum multiplexing number can be made the same as the data transmission section, so that the transmission time of the protocol information can be shortened, and the deterioration of the throughput can be minimized. There are also possible effects.

Further, when the reception state is extremely bad or for reception data addressed to another station, demodulation can be stopped during the data reception period, and there is an effect that power saving at the time of receiving data from another station can be realized.

FIGS. 7 to 9 are flowcharts showing the operation in the second embodiment of the present invention. FIG. 7 shows the operation of the control circuit when the power is turned on, and FIG. The operation is shown. FIG. 9 shows the operation of the control circuit at the time of reception.

The second embodiment shows the operation when address information is included in the multiplex channel of the protocol data. In the operation on the transmitting side, FIG. 7 and FIG.
The transmission of the address information corresponds to the transmission of the wireless protocol data (S
105, S118).

In the operation on the receiving side, after the demodulation of the protocol data is completed (S133), it is determined whether or not the data is the own station data (S135). If the packet is not a packet addressed to the own station, the address information of the transmitting station, the number of multiplexed channels, and the error rate information are accumulated (S136). If the error rate is bad, the packet is transmitted to the transmitting station. After setting a flag to reduce the number of multiplexed protocol data, the system returns to the reception standby state.

The other steps are the same as those in the first embodiment, so that the description will be omitted.

In the above embodiment, the demodulation circuit performs the correlation demodulation on all spread code channels.
It is also possible to transmit the number of multiplexed channels prior to the protocol data by the same procedure as that for transmitting the address information, and the number of correlation operations during demodulation of the protocol data may be limited according to this information.

[0050]

As described above, according to the present invention,
In a wireless communication device that performs communication by multiplexing data,
Error management means for recognizing and storing an error occurrence state in wireless communication, and a modulation means for performing modulation by changing the number of multiplexed channels of the wireless protocol information based on the error occurrence state, thereby providing an The error rate of status information can be improved, and even in the worst case where data communication cannot be performed, the reception status can be transmitted to the partner station.
Because the probability of proper communication of protocol data increases,
There is an effect that the communication state can be improved by the transmission power control based on the error rate, and the communication state can be improved by switching the antenna on the transmission side.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a time chart showing a configuration of a packet used in the embodiment.

FIG. 3 is a time chart showing another configuration of a packet used in the embodiment.

FIG. 4 is a flowchart showing an operation at the time of power-on according to the embodiment.

FIG. 5 is a flowchart showing an operation on the transmission side according to the embodiment.

FIG. 6 is a flowchart showing an operation on the receiving side according to the embodiment.

FIG. 7 is a flowchart showing an operation at power-on according to another embodiment of the present invention.

FIG. 8 is a flowchart showing an operation on the transmitting side according to the other embodiment.

FIG. 9 is a flowchart showing an operation on the receiving side according to the other embodiment.

[Explanation of symbols]

 101: control circuit, 102: external interface circuit, 103: code generation circuit, 104: modulation circuit, 105: demodulation circuit, 106, 113: mixer, 107, 114: local oscillator, 109, 112, 116: amplifier, 110: Switch, 111: antenna, 115: band-pass filter, 117: synchronous circuit.

Claims (12)

[Claims] 1. A wireless communication apparatus for performing communication by multiplexing data, comprising: an error management means for recognizing and storing an error occurrence state in wireless communication; and a multiplex channel number of wireless protocol information based on the error occurrence state. And a modulating means for performing modulation by changing the frequency. 2. The wireless communication apparatus according to claim 1, wherein the wireless protocol information is transmitted at the start of data transmission following a preamble. 3. The wireless communication apparatus according to claim 1, further comprising a power control unit that variably controls transmission power per channel of wireless protocol information according to the number of multiplexed channels. 4. The error management device according to claim 1, wherein the error management unit detects and accumulates an error rate of the wireless protocol information and an error rate of a data period subsequent thereto. A wireless communication device characterized by the above-mentioned. 5. The wireless communication apparatus according to claim 1, further comprising a demodulation unit for demodulating different multiplexed data. 6. The communication device according to claim 1, further comprising: transmitting means for transmitting each error rate as protocol data to a partner station; and analyzing means for analyzing the error rate of the partner station. Wireless communication device. 7. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is a spread spectrum communication apparatus that performs communication by multiplexing data. 8. When performing communication by multiplexing data, an error occurrence state in wireless communication is recognized, and modulation is performed by changing the number of multiplex channels of wireless protocol information based on the error occurrence state. Characteristic wireless communication method. 9. The wireless communication method according to claim 8, wherein the wireless protocol information is transmitted at a start of data transmission following a preamble. 10. The wireless communication method according to claim 8, wherein transmission power per channel of wireless protocol information is variably controlled according to the number of multiplexed channels. 11. The wireless communication apparatus according to claim 8, wherein an error rate of the wireless protocol information and an error rate of a data period following the wireless protocol information are detected and stored in a storage unit. A wireless communication method characterized by recognizing an occurrence state of an error in communication. 12. The wireless communication method according to claim 8, wherein each error rate is transmitted as protocol data to a partner station, and the error rate of the partner station is analyzed.