JP3439130B2 - Time setting method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time setting method for a base station. 2. Description of the Related Art Conventionally, a PHS base station 1 uses a time information inside a PHS base station main body based on time information periodically transmitted from a center 2 via an I ′ line (ISDN public line network). It is common to make adjustments. [0003] However, if the clock section inside the main body 1 of the PHS base station is reset for some reason, a wrong clock is sent until the time information is sent from the center 2. The time information is held, and the error time information is held during the period in which the time information is sent from the center 2. If the error time information is held, in the case of a system that performs call billing processing and the like inside the base station,
This is reflected in the call billing process and the like, which affects the entire system. [0004] As a countermeasure for this, a configuration is conceivable in which, when reset, time information is sent from the center via the I 'line during the initial operation. However, when the time information is sent, if the ISDN public line network between the center 2 and the PHS base station 1 is crowded, that is, if a network congestion occurs, the time information does not reach the PHS base station. The error time information is held until the next cycle time, which affects the entire system. The present invention has been made in view of the above problems, and provides a method for receiving time information from another PHS base station using a wireless line and performing time setting based on the time information. SUMMARY OF THE INVENTION A time setting method according to the present invention is directed to a system having a plurality of base stations connected to a wired public line and a wireless public line. Is received from another base station via a wireless public line, and the time of the own base station is set based on the time information with the minimum number of times of correction of the received time correction number information. [0008] The present invention will be described with reference to FIGS. 1 to 4. In FIG. 2, reference numeral 11 denotes an I 'line control unit for controlling data transmission with an I' line (ISDN public line network).
Reference numeral 12 denotes a wireless control unit that controls data transmission to and from a wireless public line via an antenna, 13 denotes a clock unit provided inside the PHS base station for holding current time information and counting time, and 14 includes a CPU and the like. The I ′ line control unit 11, the radio control unit 12, the clock unit 13, and the P (not shown)
It is a main control unit that controls the processing units such as the call control of the HS base station. First, the processing of the main controller 13 relating to the time information of the PHS base station in the normal state will be described with reference to the flowchart of FIG. Note that processes other than those relating to the time information are assumed to be well-known processes, and descriptions thereof will be omitted. Step S3
In 1, it is checked whether or not the time information transmitted from the center 2 at a predetermined cycle via the I ′ line and I ′ line control unit 11 has been received.
If the process of step S31 is received, and if it is received, step S3
Proceed to 2. In the present embodiment, it is assumed that the cycle at which time information is sent from the center 2 is 24 hours. In step S32, step S31
Is compared with the time information counted by the clock unit 13, and if the difference is within a predetermined value, that is, within the error range, the process returns to step S31. The process proceeds to step S33. In this embodiment, the predetermined value is 30 seconds. Step S3
In step 3, since the error is large, the time information sent from the center 2 is reset in the clock unit 13, and the process proceeds to step S3.
Proceed to 4. In step S34, the data of a variable for counting the number of times of time correction provided in the main controller 14 is incremented by one, and the process returns to step S31.
Next, the process of the main control unit 14 when the information of the clock unit 13 is reset for some reason such as a program bug will be described with reference to the flowchart of FIG. In the present embodiment, the clock unit 13 sets the reset base station to PH.
The S base station 1a will be described, and the base stations operating normally will be described as a PHS base station 1b and a PHS base station 1c. Also PH
It is assumed that a PHS base station 1b is provided in a wireless area covered by the S base station 1a. In step S411, the wireless control unit 1
2 and an antenna for transmitting information for identifying its own PHS base station (PHS base station 1a in this embodiment) and time information to the wireless line. Thereby, PHS
Information reaches the entire wireless area covered by the base station 1a. When receiving the time information transmission request signal from the PHS base station 1a via the antenna and the wireless control unit 12, the other PHS base station (the PHS base station 1b in this embodiment) belonging to the wireless area, The time information is read from the clock unit 13 in the station 1b (step S421,
In step S422), information on the number of times of correction is read out from a variable provided in the main control unit 14 and holding the number of times of time correction (step S423). The time information and the correction count information are transmitted to the PHS base station 1a, which is the PHS base station, via the wireless control unit 12 and the antenna (step S424). The PHS base station 1a whose clock unit 13 has been reset receives the time information and the correction count information from the other PHS base station (step S412), and stores the time information in its own PHS.
Set in the clock unit 13 in the base station 1a (step S41)
3). At this time, if a plurality of PHS base stations are provided in addition to the PHS base station 1b in the wireless area covered by the PHS base station 1a, the time information and the number of times of correction are transmitted from the plurality of other PHS base stations. Therefore, based on the information on the number of corrections, the time information of the other PHS base station having the least number of corrections is set in the clock unit 13 in the own PHS base station 1a. As a result, it is possible to hold time information with the least number of corrections, that is, highly reliable time information without much error. Although the present embodiment has been described using a PHS base station, the present invention is not limited to the present embodiment, and the present invention can be applied to a mobile phone base station. According to the present invention, time information can be obtained from another base station even when the wired public line becomes unusable, so that a problem affecting the entire system can be prevented. . Further, since the time information is set based on the time information with the least number of corrections from the time information from a plurality of base stations, highly reliable time information without much error can be held.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an entire system of a PHS base station. FIG. 2 is a block diagram illustrating an example of a PHS base station according to the present embodiment. FIG. 3 is a flowchart illustrating an example of normal processing of the PHS base station according to the present embodiment. FIG. 4 is a flowchart illustrating an example of a process when time information of a PHS base station according to the present embodiment is reset. [Description of Signs] 1 Base station 2 Center 11 I 'line control unit 12 Radio control unit 13 Clock unit 14 Main control unit

Claims (1)

(57) [Claims] [Claim 1] Connected to a wired public line and a wireless public line.
Time information in a system with multiple base stations
Information and the number of times of time correction are transmitted to another base station via the wireless public line.
Received from the base station, and
Set base station time based on time information with the smallest number
A time setting method.