JP2927099B2 - Mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly, to a base station in which a mobile station (MS) forms a communication path among a plurality of base stations (BS) and is communicating, and the base station during communication. While measuring the electric field of the radio wave received from the base station around the base station and reporting the measurement result to the base station during communication, the base station during communication processes the measurement result received from all the mobile stations in the communication area and performs communication. The present invention relates to a mobile communication system that instructs setting of a route.

[0002]

2. Description of the Related Art Conventionally, this type of mobile communication system measures the electric field level of a radio wave received by a mobile station from a base station in communication and a base station in the vicinity of the base station. The measurement results of all the base stations were reported periodically. On the other hand, the base station has received the measurement results received from all the mobile stations communicating in the communication area, and has processed the setting of continuation / change of the base station with which the communication is performed.

FIG. 3 is a configuration diagram showing an example of a mobile communication system.

[0004] An MS (mobile station) 1 is under the control of a communicating BS (base station) 2 and communicates with the communicating BS 2 and the surrounding BS.
The electric field strengths from S3, 4, 5, 6, and 7 are measured and are reported periodically to BS2 during communication. BS2,3,4,5
6 and 7 are communication areas 12, 13, 14, 1
Each of 5, 16, and 17 is a communication zone.

FIG. 4 is a flow chart of a process showing an example of a main operation procedure of a mobile station in a conventional system. Next, the processing procedure will be described with reference to FIG. 4 and FIG.

[0006] BS2 becomes the BS during communication of MS1 and starts communication (procedure 201). MS1 starts timed measurement of the measurement result report to BS2 (procedure 202). Thereafter, while the communication is continued (procedure 201), the MS 1 transmits to the BSs 2, 3, and
The electric fields from 4, 5, 6, and 7 are measured, and the preparation of a measurement result report to BS2 during communication is made (step 204).

Until the measurement result report time limit is reached, the measurement and processing of the electric field are continued (step 204), and when the measurement result report time limit is reached (step 205), the MS 1 is in communication B
The measurement result is reported to S2 (procedure 206).

[0008] Upon receiving the report, the BS2 analyzes the state and
1 selects a base station with which to communicate, and notifies the MS 1 when relocating the communicating BS2.

When a transfer instruction of a communicating base station is received from BS2 in communication with, for example, BS3 (procedure 207), MS
1 transfers the communicating base station from BS2 to BS3 (procedure 2
08), time measurement in step 202 is started.

FIG. 5 is a data diagram showing an example of a measurement result reported by one of the mobile stations to the communicating base station. MS1 in FIG. 3 indicates reception levels, reception channel numbers and BSs as states of reception radio waves of surrounding BSs 2 to 7, respectively.
The identifiers are sequentially and collectively transmitted to BS2 of the communicating base station.

[0011]

In the conventional mobile communication system described above, the base station BS periodically receives all associated base stations BS from all mobile stations MS forming a communication path in the communication area. Since the radio wave state is transmitted based on the measurement result of the reception level, there is a problem in that the load of the analysis processing of the large amount of measurement result data is large and the other processing capacity is pressed.

An object of the present invention is to provide a mobile communication system which solves the above-mentioned problem by limiting the report data of the received radio wave state transmitted from the mobile station MS to the communicating base station BS.

[0013]

SUMMARY OF THE INVENTION A mobile communication system according to the present invention.
The system comprises a mobile station and a plurality of base stations, wherein the mobile station is
A communication base that forms a communication path among a plurality of base stations and is performing communication.
From the base station and base stations around this communicating base station.
Measuring the electric field of the radio wave, and sending the measurement result to the base station during communication.
While reporting, the base station that is communicating
Processing the measurement result received from the station and instructing the setting of the communication path
In the mobile communication system to perform, measured by the mobile station
The electric field level is 1) or higher than the electric field level of the communicating base station.
2) If there is a base station that transmits
Although the electric field level is lower than that of the local station,
If there is a base station for transmitting the received radio wave of the bell, 3) the communication
The electric field level from the middle base station is below the predetermined lower limit reference value.
When detecting any one of
The feature is to report to the base station during communication.

[0014]

[0015]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing one embodiment of a main operation procedure of a mobile station according to the present invention. This will be described with reference to FIG. 1 and FIG.

First, when the mobile station MS1 starts communication with the base station BS2 serving as a communicating base station (procedure 101), measurement of a time period for reporting a result of the level measurement value of the received radio wave is started (procedure 102). .

If there is no end of communication (step 103), the mobile station MS1 prepares a result report of the measured level value (step 104) and waits for the end of the time period (step 105).

When the time limit has been reached, the mobile station MS1 analyzes and processes the measurement results (procedures 106 to 108, 120).

The mobile station MS1 analyzes that the level value with the communicating base station BS2 is higher than any of the level values of the other base stations BS3-7 (procedure 106), and then analyzes the other base stations BS3-7. It is analyzed that there is no level value that satisfies the minimum reference value LVL1 necessary and sufficient for communication among the level values of (1).
07) and the level value with the base station BS2 during communication is the switching reference value LVL2 which needs to be switched due to deterioration of the reception electric field.
Is exceeded (procedure 108), an instruction to relocate the communication base station is received from the communicating base station BS2 (procedure 10).
9) Procedure 10 for starting timed measurement again unless there is any
Repeat the procedure from step 2.

When receiving the transfer instruction in step 109, the mobile station MS1 switches the communication path according to the instruction, and transfers the base station BS2 under communication to, for example, the base station BS3 (step 11).
0), the procedure starts from the procedure 102 for starting the timed measurement for reporting to the base station BS3 again.

If there is another base station (for example) B3 having a level value larger than the level value of the radio wave with the communicating base station B2 in step 106, the other base stations BS3 to BS3 in step 107.
7 has a level value exceeding the minimum reference value LVL1,
And when the level value of the base station BS2 under communication in step 108 falls below the switching reference value LVL2, in any case, the mobile station MS1 reports only the data necessary for processing by the base station BS2 among the measurement results. (Step 120).

FIGS. 2A, 2B and 2C respectively show:
1 shows an example of report data transmitted to a base station in communication in procedures 106, 107, and 108 in FIG.

As shown in FIG. 2A, a mobile station MS1 receives a reception level, a reception channel number and a BS of a base station BS2 in communication and a base station BS3 having a higher level value.
Report the identifier. In this case, the base station BS2 is the base station B
After confirming the empty channel of S3, the communication path with the mobile station MS1 is relocated from the base station BS2 to the base station BS3 to provide higher communication quality.

The report data in step 107 shown in FIG. 2B is obtained when base stations BS3 and BS4 are larger than reference value LVL1, and the reception levels, reception channel numbers and BSs of base stations BS2, BS3 and BS4 respectively. Contains an identifier. Since these levels are maximum for the communicating base station BS2, the base station BS2 has, for example, a small holding channel,
When the base stations BS3 and BS4 have room for the number of channels to be used, a process of relocating the communication path to the base station BS3 can be performed to effectively use the channels.

The data shown in FIG.
In the case of the procedure 108 in which the level value with S2 falls below the switching reference value LVL2 regardless of the maximum value, the base station BS2 which has received the procedure 108 instructs the mobile station MS1 to replenish power so as to maintain the communication quality. Is taken.

That is, the mobile station MS reports the measurement result to the base station BS, and the base station BS receiving the report.
Manages data and performs processing. For simplicity, the effect of the present invention will be verified on the assumption that a load L is required to process one piece of received data.

Now, the mobile station MS traverses a communication area having a radius of 4.8 km of the base station BS having a speed of 60 km / h.
The mobile station MS is a communicating base station and surrounding base stations BS,
It is assumed that data of a total of six base stations BS is reported every 480 msec.

The time required for the mobile station MS to pass through the communication area is 9.6 minutes. During this time, the mobile station MS reports the measurement results 1200 times to the base station BS. In the conventional system, the base station BS receives the data L of six stations 1200 times,
That is, a load of 7200 L is applied.

The mobile station MS crosses the communication area 9.6 km
Among them, at the center of 0.96 km, there is one base station BS supplying an electric field of a fixed reference value or more to the mobile station MS in addition to the communicating base station BS, and the last 0.96 km
In m, it is assumed that there is one base station BS that supplies an electric field exceeding the electric field received from the base station BS during communication.

At this time, according to the present invention, the number of times that the mobile station MS reports to the communicating base station BS is one time of the conventional system.
0% + 10% = 20%, that is, 240 times. The data is the data from the communicating base station BS and one other base station B
S, only data from a total of two base stations BS are reported. Therefore, 2L × 240 = 48 is provided for the communicating base station BS.
Only a load of 0 L will be applied.

That is, in the above example, the load on the base station accompanying the reception of the measurement result from the mobile station is (480) of the conventional system.
L × 100 / 7200L =) is reduced to 6.6%.

[0032]

As described above, the present invention is configured so that the mobile station measures and analyzes the electric field of the received radio wave and limits the data to be reported to the base station during communication. Has the effect of reducing

[Brief description of the drawings]

FIG. 1 is a flowchart showing one embodiment of a main operation procedure of a mobile station according to the present invention.

FIG. 2 is a block diagram illustrating an example of report data transmitted to a communicating base station in the procedure of FIG. 1;

FIG. 3 is a configuration diagram illustrating an example of the present system.

FIG. 4 is a flowchart illustrating an example of a main operation procedure of a mobile station in a conventional system.

FIG. 5 is a data block diagram showing an example of a measurement result reported by a conventional mobile station.

[Explanation of symbols]

 1 Mobile station (MS) 2, ~ 7 Base station (BS) 12, ~ 17 Communication area

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04B 7/24-7/26 102 H04Q 7/00-7/38

Claims (1)

(57) [Claims] 1. A mobile station comprising : a mobile station; and a plurality of base stations.
The mobile station forms a communication path among the plurality of base stations and is performing communication.
The communicating base station and the base stations around this communicating base station
Measuring the electric field of the radio waves received from the
While reporting the measurement results, the communicating base station is
Processing the measurement results received from all mobile stations in
In a mobile communication system which instructs the constant, the electric field level of the mobile station has measurement, 1) the electric field level or more received radio waves in the communication base station origination
If there is a communication base station , 2) The electric field level is lower than that of the base station during the communication,
If there is a base station that transmits received radio waves with a level higher than the
If, 3) electric field level is a predetermined lower limit groups from the communicating base station
If the value is below the reference value and one of them is detected, this state is
A mobile communication system for reporting to a local station.