JP2003224508A - Method and system for radio communication of mobile communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication system of a mobile communication system for minimizing a voice delay and an unwanted lack in a leading portion by continuously transmitting a frame for synchronization corresponding to the quality of a radio channel. <P>SOLUTION: This radio communication system of the mobile communication system consists of a base station 102 and mobile stations 103, 104 and 105 mutually connected by radio through a digital communication system, and a control (command) console 101 that communicates with the mobile stations 103 to 105 through the base station 102. When any station starts transmission, the number of repeatedly transmitting times (the number of times of continuous transmission) of a frame for synchronization for the opposite communication party to perform pull-in is defined as the number of times calculated on the basis of line quality measured at reception when the station starting transmission performs any reception just before the pull-in, and as the predetermined number of times when the station does not perform reception just before the pull-in. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system of a mobile communication system, and more particularly to a mobile communication system in which a synchronization frame is continuously transmitted a number of times according to the wireless line quality to minimize voice delay and head loss. The present invention relates to a wireless communication system of a communication system.

[0002]

2. Description of the Related Art In a mobile communication system of a digital communication system for transmitting a connection signal, voice information and the like using a radio channel composed of time division frames, a transmitting station synchronizes immediately before transmitting a frame of a voice signal and the like. For transmitting (continuously transmitting) a communication frame several times and synchronizing the receiving station to pull in ("Published by the Association of Radio Industries and Businesses," ARIB STD-T
61 Narrow-band digital communication standard "") is generally adopted.

If the number of consecutive transmissions of the synchronization frame is set to be small, the voice information or the like will be transmitted before the synchronization pull-in is completed on the receiving station side. Since the operator of the transmitting station initiates the transmission start operation to start the transmission of the synchronization frame, there is a problem that the voice delay and the head loss occur as the length of the continuous transmission time increases.

Conventionally, the number of continuous transmissions of synchronization frames has been determined by setting the number of continuous transmissions calculated from a state in which the quality of the wireless channel is poor, as a default value, so that synchronization can be pulled in at the receiving station. . Therefore, when the quality of the wireless line is good, the synchronization frames are continuously transmitted more than necessary, which causes a lot of problems such as voice delay and head loss.

[0005]

In the above-described wireless communication system of the mobile communication system, when the number of consecutive transmissions of the synchronization frame for synchronizing the receiving station is set to be small, the receiving station side Audio information will be transmitted before the synchronization pull-in is completed.If a large number of settings are set, the operator of the transmitting station initiates the transmission start operation and then starts transmission of this synchronization frame. As the length of time increases, there is a drawback that voice delay and head loss occur.

In order to eliminate such a conventional defect, an object of the present invention is to provide a synchronization frame with the number of continuous transmissions required for synchronization pull-in at a communication partner station, which is calculated from the line quality when received immediately before. It is to provide a wireless communication system of a mobile communication system that minimizes the occurrence of voice delay and head loss by continuously transmitting.

[0007]

A wireless communication method for a mobile communication system of the present invention is a wireless communication method for a mobile communication system in which a base station and a plurality of mobile stations are wirelessly connected to each other. When one of the mobile stations starts transmission, the number of times of repeated transmission of the synchronization frame (the number of consecutive transmissions) for pulling in synchronization by the communication partner station, if it was received immediately before, at the time of reception It is characterized in that the number of times calculated based on the measured line quality is set, and if it is not received immediately before, the number of times is set in advance.

A radio communication method for a mobile communication system according to the present invention is a radio communication method for a mobile communication system in which a base station and a plurality of mobile stations are wirelessly connected to each other. When one of the stations starts transmitting, a Selective Calling Sy
The number of repeated transmissions of the synchronization frame (the number of consecutive transmissions) of the synchronization frame for the communication partner station to synchronously pull in after the communication partner station is specified by transmitting only the signal;
Is the number of times calculated based on the line quality measured at the time of reception when it was received from the communication partner station immediately before,
If it has not been received immediately before, or if it has been received from a station other than the communication partner station, the number of times is set in advance.

Further, the communication partner station measures the line quality (bit error rate) by using the fixed bit pattern included in the received synchronization frame, and repeats the synchronization frame in the next transmission. Number of transmissions (number of consecutive transmissions)
It is characterized by determining.

A radio communication system of a mobile communication system according to the present invention is a radio communication system of a mobile communication system in which a base station and a plurality of mobile stations are wirelessly connected to each other. When one station starts transmission, the line quality measured at the time of receiving the number of repeated transmissions (number of continuous transmissions) of the synchronization frame for the other station to pull in synchronization, if it was received immediately before. It is characterized in that the number of times calculated based on the above is set, and when the number of times of reception has not been received immediately before, the number of times is set in advance.

A radio communication system of a mobile communication system of the present invention is a radio communication system of a mobile communication system in which a base station and a plurality of mobile stations are wirelessly connected to each other. When one of the stations starts transmitting, a Selective Calling Sy
The number of repeated transmissions of the synchronization frame (the number of consecutive transmissions) of the synchronization frame for the communication partner station to synchronously pull in after the communication partner station is specified by transmitting only the signal;
Is the number of times calculated based on the line quality measured at the time of reception when it was received from the communication partner station immediately before,
If it has not been received immediately before, or if it has been received from a station other than the communication partner station, the number of times is set in advance.

The communication partner station measures the line quality (bit error rate) using the fixed bit pattern included in the received synchronization frame, and repeats the synchronization frame at the time of next transmission. Number of transmissions (number of consecutive transmissions)
It is characterized by determining.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system configuration example showing an embodiment of a mobile communication system to which a wireless communication system of a mobile communication system of the present invention is applied.

In the present embodiment shown in FIG. 1, a base station 102 and mobile stations 103, 104 and 105 wirelessly connected to each other by a digital communication system, and mobile stations 103, 104 and 105 via the base station 102. It is composed of a control (command) console 101 that performs communication.

In FIG. 1, the base station 102 and the mobile station 10 are
3 and the mobile station 104 and the mobile station 105 are wirelessly connected. Also, control table 1
Generally, 01 and the base station 102 are connected by wire.

Next, the communication procedure of this embodiment will be described in detail with reference to FIG. FIG. 2 is a flow chart showing the communication procedure of this embodiment. Here, it is assumed that communication is performed between the mobile station 104 that starts transmission and the mobile station 105 that responds as a communication partner station.

First, the mobile station 104, which is the transmitting station, continuously transmits the synchronization frame 201 several times by the pressing operation of the operator, and pulls in the synchronization of the receiving station. At this time, if the mobile station 104 has received something immediately before, the line quality, for example, the bit error rate is obtained from the received frame at that time, and the synchronization frame is continuously transmitted by the calculated number. If the mobile station 104 has not received anything immediately before, the synchronization frame is continuously transmitted a predetermined number of times (stored initial value).

The mobile station 104, after completing the continuous transmission of the synchronization frame 201, continues to the voice signal frame 202.
To start sending. It is assumed that the synchronization frame 201 and the audio signal frame 202 always include a fixed bit pattern for measuring a bit error rate or information that always has a fixed value such as a system identification code.

The mobile station 10 which responds as one communication partner station
5 is a synchronization frame 20 transmitted from the mobile station 104.
While receiving 1 and the voice signal frame 202, the bit error rate of each received frame is measured using the fixed bit patterns contained in those frames to obtain an average value thereof, and then the mobile station 105 Is set as a transmitting station, and in preparation for starting transmission, the number of continuous transmissions of synchronization frames for synchronously pulling in the opposite station (mobile station 104) of the communication partner under the communication environment of the bit error rate is determined in advance. It is calculated and determined based on the obtained algorithm (process 203).

Next, the mobile station 105, which is the transmitting station, continuously sends the synchronization frames 204 calculated and determined in the process 203 to the mobile station 104 by the press operation of the operator to perform synchronization pull-in. After the mobile station 105 completes the continuous transmission of the synchronization frame 204, the mobile station 105 subsequently starts transmitting the audio signal frame 205.

According to the present embodiment described above, the mobile station 10
5 measures the bit error rate of the transmission frame from the mobile station 104 received immediately before, and determines the number of transmissions (the number of consecutive transmissions) of the synchronization frame for the next transmission based on the result, and at that time It is possible to determine the optimal number of consecutive transmissions of the synchronization frame in the communication environment, and especially when the communication environment (bit error rate) is good, it is necessary to have an effect such as audio delay or head loss due to the continuous transmission of the synchronization frame. It can be kept to a minimum.

Next, another embodiment of the present invention will be described. FIG. 3 is a flowchart showing an example in which the communication procedure shown in FIG. 2 is expanded. According to FIG. 3, it differs in that a signal (select call signal) for specifying the communication partner station is transmitted at the start of the communication procedure.

In the example of the communication procedure shown in FIG. 2, since the communication partner station is not specified, when the transmitting station transmits to a plurality of stations, the station that measured the bit error rate at the last reception is For another communication partner station located at a distant place and having a large bit error rate, the frame synchronization signal may not be transmitted sufficiently and synchronization may not be pulled in.

In the communication procedure shown in FIG. 3, before starting a series of communication procedures, a select call signal 200 for specifying a communication partner station is transmitted by the operation of the transmitting station operator. Therefore, since the communication with the communication partner station whose bit error rate is measured can be performed by adopting the mechanism of communicating only with the specific communication partner station, it is possible to determine a more appropriate number of times. Subsequent operations are similar to the communication procedures 201 to 205 shown in FIG.

[0025]

As described above, according to the wireless communication method and the wireless communication system of the mobile communication system of the present invention, the number of continuous transmissions required for synchronization pull-in at the receiving station is the line quality (bit By continuously transmitting the synchronization frames at the number of times calculated from the (error rate), it is possible to minimize the occurrence of voice delay and head loss.

[Brief description of drawings]

FIG. 1 is a system configuration example showing one embodiment of a mobile communication system to which a wireless communication system of a mobile communication system of the present invention is applied.

FIG. 2 is a flowchart showing a communication procedure of the present embodiment.

3 is a flowchart showing an example in which the communication procedure shown in FIG. 2 is expanded.

[Explanation of symbols]

101 Control (command) console 102 base station 103, 104, 105 mobile stations

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04B 7/26 NF term (reference) 5K014 AA01 DA02 FA11 GA02 5K033 CB15 DA01 DA19 EA07 5K047 AA13 BB01 HH01 HH12 HH21 JJ06 5K067 AA01 BB02 DD25 DD45 DD46 EE02 EE10 GG01 GG07 GG11 HH28

Claims (6)

[Claims] 1. A wireless communication method for a mobile communication system in which a base station and a plurality of mobile stations are wirelessly connected to each other, wherein communication is performed when either the base station or the mobile station starts transmission. The number of repeated transmissions of the synchronization frame (the number of continuous transmissions) for the other station to pull in synchronization is set to the number calculated based on the line quality measured at the time of reception, if it was received immediately before. If not, the wireless communication method of the mobile communication system is characterized in that the number of times is predetermined. 2. A wireless communication method for a mobile communication system in which a base station and a plurality of mobile stations are wirelessly connected to each other, wherein a select call is made when either the base station or the mobile station starts transmission. (Selective Calling
System; SELCAL) signal is transmitted to specify the communication partner station, and then the number of times of repeated transmission of the synchronization frame (the number of continuous transmissions) for the communication partner station to pull in synchronization is received from the communication partner station immediately before. If it was, the number of times calculated based on the line quality measured at the time of reception was used, and if it was not received immediately before, or if it was received from other than the communication partner station A wireless communication method for a mobile communication system, comprising: 3. The communication partner station measures the line quality (bit error rate) using a fixed bit pattern included in the received synchronization frame, and repeats the synchronization frame when transmitting next. 3. The wireless communication method for a mobile communication system according to claim 1, wherein the number of transmissions (the number of continuous transmissions) is determined. 4. A wireless communication system of a mobile communication system in which a base station and a plurality of mobile stations are wirelessly connected to each other, and communication is performed when either the base station or the mobile station starts transmission. If the number of repeated transmissions of the synchronization frame (the number of consecutive transmissions) for the other station to pull in synchronization is set to the number calculated based on the line quality measured at the time of reception when it was received immediately before, If not, the wireless communication system of the mobile communication system is characterized in that the number of times is predetermined. 5. A wireless communication system of a mobile communication system in which a base station and a plurality of mobile stations are wirelessly connected to each other, and a select call is made when either the base station or the mobile station starts transmission. (Selective Calling
System; SELCAL) signal is transmitted to specify the communication partner station, and then the number of times of repeated transmission of the synchronization frame (the number of continuous transmissions) for the communication partner station to pull in synchronization is received from the communication partner station immediately before. If it was, the number of times calculated based on the line quality measured at the time of reception was used, and if it was not received immediately before, or if it was received from other than the communication partner station A wireless communication system for a mobile communication system, comprising: 6. The communication partner station measures the line quality (bit error rate) using a fixed bit pattern included in the received synchronization frame, and repeats the synchronization frame when transmitting next. 6. The wireless communication system of the mobile communication system according to claim 4, wherein the number of transmissions (the number of continuous transmissions) is determined.