JPH07226707A - Mobile radio data communication method - Google Patents

Abstract

PURPOSE:To preclude the possibility of a radio transmitter to be an interruption noise source giving interference on the communication of other mobile station by reducing transmission power of a radio transmitter. CONSTITUTION:When packet data 2 sent from a packet data terminal equipment 1 are sent through a line exchange radio channel via a mobile station 4, the presence of the packet data are identified by using a flag monitor means 3 to monitor a flag in the packet data 2, a transmission output of a radio transmitter 5 is set to be an ON state only when the packet data to be sent are in existence and the transmission output of the radio transmitter 5 is set to be an OFF state when the packet data to be sent are not in existence. Thus, it is possible to reduce power consumption of the radio transmitter 5 considerably. Furthermore, an interference noise source on the communication of other mobile stations is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio data communication method using a radio transmitter / receiver in a mobile station, and more particularly to packet packet data sent from a packet data terminal for circuit switching via the radio transmitter / receiver in the mobile station. The present invention relates to a mobile radio data communication method capable of significantly reducing the power consumption of a radio transmitter / receiver when transmitting to a radio line and also reducing the interference noise source of the communication of other mobile stations.

[0002]

2. Description of the Related Art It is known in the prior art to send and receive data from a transmitting packet data terminal via a circuit switching radio line. As an example of this, for example, RCR (Resea
rch & development Center for Radio systems; Radio System Development Center of Japan) standardized digital car telephone system (Public Digital Ce)
llular; hereinafter referred to as PDC), there is wireless data communication using a packet data terminal. This example is shown in FIG. Here, assuming circuit switching, only the flow of data transmitted from the transmitting packet data terminal side will be considered.

In FIG. 8, 41 is a packet data terminal for transmission, 42 is a computer (personal computer), 43 is a modem, 4
4 is a data communication adapter, 45 is a mobile station that wirelessly communicates with a plurality of wireless base stations (not shown) connected to the communication network,
Reference numeral 46 denotes a wireless transceiver. The transmission packet data terminal 41 is assumed to be composed of a computer 42 and a modem 43 as shown in the figure. The data transmitted from the computer 42 is transmitted to the data communication adapter 44 via the modem 43. The data communication adapter 44 converts the packet data sent from the modem 43 so as to conform to the PDC format and sends it to the mobile station 45.
The transmit power of the wireless transceiver 46 in the mobile station 45 is always on regardless of whether the data to be transmitted is continuous or discrete (or with or without data), and thus the data communication adapter. The data sent from is always sent to the wireless section. In this way, in the conventional method, the power of the wireless transmitter is unnecessary because the transmission output of the wireless transmitter is always on regardless of whether or not there is data to be transmitted, that is, even when there is no data. Will be consumed by. Also, in such a case, since the transmission output of the wireless transmitter is turned on, it means that unnecessary signals (noise) are being sent out. There is also a possibility.

[0004]

As described above,
When sending data from a packet data terminal to a wireless line for circuit switching, the power output of the wireless transmitter is always on because the transmission output of the wireless transmitter is always on even when there is no data to be transmitted by the conventional method. There is a problem that it increases unnecessarily. Further, in such a case, since an unnecessary signal (noise or the like) is transmitted, there is a problem that it becomes an interference noise source for communication of other mobile stations. An object of the present invention is to eliminate the above problems, reduce the power consumption of a wireless transmitter, and reduce the possibility of becoming an interference noise source with respect to communications of other mobile stations. To provide a method.

[0005]

In order to achieve the above object, the present invention has one or more radio base stations and a radio transmitter internally connected to the radio base stations via a radio line.
The mobile station includes the above mobile station and a transmission packet data terminal connected to the mobile station, and packet data transmitted from the transmission packet data terminal is transmitted to the radio base station via the mobile station and the radio line. In a mobile radio data communication method for transmitting, a flag in packet data transmitted from the transmission packet data terminal is monitored, and ON / OFF of transmission output of a radio transmitter in the mobile station is controlled according to a monitoring result. It is characterized by doing so. Also, flags are provided at the beginning and end of the packet data,
The transmission output of the wireless transmitter is turned on when a certain flag is detected first, and the transmission output of the wireless transmitter is turned off when a certain flag is detected last.
Further, a flag is provided at the beginning of the packet data, the transmission output of the wireless transmitter is turned on when the flag is detected, and the transmission output is turned off after a predetermined time has elapsed.

[0006]

According to the present invention, the flag in the packet data transmitted from the transmitting packet data terminal is monitored, and the transmission output of the wireless transmitter in the mobile station is controlled to be turned on / off according to the monitoring result. Therefore, the power consumption of the wireless transmitter can be significantly reduced, and the possibility of becoming an interference noise source in the communication of other mobile stations can be reduced. Also, flags are provided at the beginning and the end of the packet data so that the transmission output of the wireless transmitter is turned on when the first flag is detected, and the transmission output of the wireless transmitter is turned off when the last flag is detected. I chose HDL
C (High level Data Link Control procedures)
It can be applied to packet data consisting of frames. Further, a flag is provided at the beginning of the packet data, the transmission output of the wireless transmitter is turned on when the flag is detected, and the transmission output is turned off after a predetermined time has passed, whereby a TCP / IP + Ethernet frame is transmitted. It can be applied to packet data.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a block diagram of an embodiment of the present invention. The figure shows the case where the transmission packet data terminal is connected to the circuit switching radio line, and in this example, only the flow of data transmitted from the transmission packet data terminal is considered. In the figure, 1 is a transmission packet data terminal, which has the same configuration as the transmission packet data terminal 41 in FIG. 2 is packet data sent from the transmitting packet data terminal, 3 is flag monitoring means, 4 is a mobile station,
Reference numeral 5 indicates a wireless transmitter. First, it is assumed that packet data 2 is transmitted from the transmitting packet data terminal 1.
Here, as a frame of packet data, HDLC
Consider two types of frames (High level DataLink Control procedures) and TCP / IP + Ethernet frames.

The HDLC frame is a frame used in Layer 2 of the packet protocols X.25 and X.75. For this reason, all packet data terminals that use X.25, X.75, etc. for Layer 2 of the data communication protocol will use HDLC frames. An example of this is
For example, G4 FAX communication and FRAPI (Ftp Recommen
There is ISDN personal computer communication using the dation application programming interface.
FIG. 2 shows the structure of the HDLC frame 6. In the figure, 7 is a flag, 8 is a header, 9 is data, and 10 is CRC (Cyc
lic Redundancy Check) code, 11 is a flag. The arrow on the right side of the HDLC frame 6 indicates the data transmission order. The flags 7 and 11 are for identifying the delimiters of each frame and for synchronizing, and have a specific bit pattern. Specifically, 0111111
The pattern is 0. Here, the bit pattern of the flag is determined so that the same pattern does not exist in the header, data, and CRC. The header 8 contains information regarding the type of frame. Data 9
Is a part of the information to be transmitted, which is cut into a specific length. The CRC 10 is an error detection code for data. HDLC frame length is 16 bytes to 4096
It has a variable length of bytes (typically 128 bytes).

The TCP / IP + Ethernet frame has a TCP (Transmissio
n Control Protocol), Layer 3 IP
(Internet Protocol) protocol, Layer 2
This is a frame used when using the rnet protocol. An example of this is an Ethernet indoor LAN
In (Local Area Network), a UNIX workstation may be used to perform TCP / IP communication. FIG. 3 shows the structure of the TCP / IP + Ethernet frame 12. In the figure, 13 is a preamble, 1
4 is Ethernet header, 15 is IP header, 16 is TC
P header, 17 is data, and 18 is CRC. TCP
The arrow on the right side of the / IP + Ethernet frame 12 indicates the data transmission order as in the case of FIG. The preamble 13 is a signal for identifying frame delimiters and synchronizing them. Ethernet header 14, IP header 1
5 and TCP header 16 are headers generated by the Ethernet protocol, IP protocol, and TCP protocol, respectively, and contain various information such as frame length. The data 17 is a part of the information to be transmitted, which is cut into a specific length. The CRC 18 is an error detection code for data. The TCP / IP + Ethernet frame 12 has a variable length of 64 bytes to 1518 bytes excluding the preamble 13, and the length of the preamble is 8 bytes.

According to the present invention, when the packet data 2 sent from the packet data terminal 1 is transmitted through the circuit-switching wireless line, the flag in the packet data 2 is constantly monitored by the flag monitoring means 3 and the packet data 2 is transmitted. Based on the flag presence / absence information, ON / OFF of the transmission output of the wireless transmitter of the mobile station
It is characterized by performing off control. In this case, the flags to be monitored are flags 7 and 11 in the case of the HDLC frame 6, and TCP / IP + Ethernet.
In the case of the frame 12, the preamble 13 is used.

Two specific control methods will be described below.
The first method is to give an instruction to turn on the transmission output of the wireless transmitter when the first flag of the packet data is detected, and to transmit the wireless transmitter when the end flag of the packet data is detected. This is a method of giving an instruction to turn off the output. A flow chart showing this operation is shown in FIG. First, the flag position identifier is set at the beginning of the data (step 20). When the flag is detected (step 21), it is determined whether the flag position identifier at that time is set at the beginning of the data (step 2).
2) Then, if it is set at the beginning of the data, after turning on the transmission output of the wireless transmitter (step 23), the setting of the flag position identifier is reversed (step 25). That is, when the flag position identifier is set at the beginning of the data, it is changed to the end of the data, and when it is set at the end of the data, it is changed to the beginning of the data. Then step 21
Return to. If the result of determination in step 22 is that the flag position identifier is set at the end of the data, the transmission output of the wireless transmitter is turned off (step 24), and then the setting of the flag position identifier is reversed (step 25). .

According to this method, with respect to the transmission of the packet data having the flags at the beginning and the end, the transmission output is turned on only during the period of transmitting the data sandwiched between the two flags, and other than that. Since the transmission output is turned off during the period, the power consumption of the wireless transmitter can be greatly reduced.
Since the transmission output is turned off during an unnecessary period, it is possible to reduce the possibility of becoming an interference noise source for communication of other mobile stations. To apply this method, flags must be set at the beginning and end of packet data. Therefore, this method uses HDL with flags at the beginning and the end.
Applicable to C frames, but not applicable to TCP / IP + Ethernet frames where the flag is only present first.

The second method is to give an instruction to turn on the transmission output of the wireless transmitter when the flag of the packet data is found, and to change the transmission output of the wireless transmitter when the time when the flag is not found exceeds a predetermined threshold. This is a method of giving an instruction to turn off. A flowchart showing this operation is shown in FIG. First, the timer value is initialized to 0 and the timer is initialized to off (step 30). Next, when the flag is detected (step 31), the timer value is set to 0 and the timer is set to on (step 32), then the transmission output of the wireless transmitter is turned on (step 33), and the process returns to step 31. Next, when the flag is detected in step 31, the timer value is compared with a predetermined threshold value that is determined in advance (step 34). If the timer value is less than or equal to the predetermined threshold value, the process returns to step 31 and the timer value is below the predetermined threshold value. When it becomes larger, the timer value is set to 0, the timer is turned off (step 35), and then the transmission output of the wireless transmitter is turned off (step 36). In this method, the flag needs to be set only at the beginning of the packet data. Therefore, this method uses TCP / IP
+ Applicable to Ethernet frame, but HDLC
Not applicable to frames. Next, a specific method of determining the predetermined threshold value in the second method will be described. If the maximum length of the packet data set in the packet data terminal is I bits and the packet data transfer rate between the packet data terminal and the flag monitoring means is X bits / second, the threshold value becomes I / X seconds.

As can be seen from the above description, when the transmission output of the wireless transmitter is in the ON state, there is data to be transmitted, so the transmission output of the wireless transmitter is the signal transmitted from the flag monitoring device. To send. In addition, when the transmission output of the wireless transmitter is in the off state, there is no data, so no signal is transmitted from the flag monitoring device. Further, in the embodiment of FIG. 1, the flag monitoring means 3 is provided separately from the mobile station 4, but if it is configured so that the output of the wireless transmitter is controlled by the output of the flag monitoring means, it is provided in the mobile station. It goes without saying that it is okay.

As the operation when the transmission output of the wireless transmitter is in the off state, the following first and second modes are conceivable, and can be selected as necessary when designing the system.
In the first mode, as shown in the signal state in the wireless section in FIG. 6, the transmission power of the data part is turned off, but in order to synchronize the wireless frame, it has a unique pattern different from the others. This is a case where only the transmission power of a portion such as the word (flag) 40 is turned on. The second mode is shown in FIG.
In this case, the transmission power of all data is completely turned off, as shown in the signal state in the wireless section. As described above, according to the present embodiment, the transmission output of the wireless transmitter is turned on only when there is packet data to be transmitted, and the transmission output of the wireless transmitter is turned off when there is no packet data to be transmitted. I have to. Therefore, the power consumption of the wireless transmitter can be significantly reduced. It is also possible to reduce the possibility of becoming an interference noise source for communication of other mobile stations.

[0016]

As described above, in the present invention, the flag in the packet data is constantly monitored by the flag monitoring means, and the transmission output of the wireless transmitter of the mobile station is detected based on the flag presence / absence information in the packet data. Since the on / off control is performed, the power consumption of the wireless transmitter can be significantly reduced. It is also possible to reduce the possibility of becoming an interference noise source for communication of other mobile stations.

[Brief description of drawings]

FIG. 1 is a diagram showing a data transmission system in an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of an HDLC frame.

FIG. 3 is a diagram showing a structure of a TCP / IP + Ethernet frame.

FIG. 4 is a flowchart of an on / off control method using flag position determination.

FIG. 5 is a flowchart of an on / off control method using a threshold value.

FIG. 6 is a diagram showing a state of a signal in a wireless section when a transmission output of a wireless transmitter is in an off state (when the transmission power of a data part is turned off, but the transmission power of only a part such as a unique word is turned on). ).

FIG. 7 is a diagram showing a state of signals in a wireless section when a transmission output of a wireless transmitter is in an off state (when transmission power of all data is completely turned off).

FIG. 8 is a diagram showing a conventional data transmission system in a PDC.

[Explanation of symbols]

 1, 41 packet data terminal for transmission 2 packet data 3 flag monitoring means 4, 45 mobile station 5 wireless transmitter 42 personal computer (computer) 43 modem (MODEM: modem) 44 data communication adapter 46 wireless transceiver

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI technical display location 9077-5K H04L 11/20 102 A (72) Inventor Akira Hiroike 2-10 Toranomon, Minato-ku, Tokyo No. 1 NTT Mobile Communications Network Co., Ltd.

Claims (3)

[Claims] 1. One or more wireless base stations, and a wireless transmitter internally connected to the wireless base stations via a wireless line.
The mobile station includes the above mobile station and a transmission packet data terminal connected to the mobile station, and packet data transmitted from the transmission packet data terminal is transmitted to the radio base station via the mobile station and the radio line. In a mobile radio data communication method for transmitting, a flag in packet data transmitted from the transmission packet data terminal is monitored, and ON / OFF of transmission output of a radio transmitter in the mobile station is controlled according to a monitoring result. A mobile wireless data communication method characterized by the above. 2. The mobile radio data communication method according to claim 1, wherein the packet data has a flag at the beginning and at the end, and when the flag at the beginning of the packet data is detected, A mobile radio data communication method, comprising: turning on a transmission output and turning off a transmission output of the wireless transmitter when a flag at the end of the packet data is detected. 3. The mobile radio data communication method according to claim 1, wherein the packet data initially has a flag, and the transmission output of the radio transmitter when the flag at the beginning of the packet data is detected. Is turned on, and the transmission output is turned off after a predetermined time has elapsed, a mobile wireless data communication method.