JPH09116948A - Intermittent idle monitor method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the occurrence of unnecessary monitoring and the failure of link establishment by setting intermittent time decided by the number of frequencies by which monitoring is executed, time required for monitoring and time when a monitor result becomes valid. SOLUTION: The time 5 of one frame is multiplied by the number of continuous frames required for the monitor result to obtain time 1 required for one frequency monitoring. Then, time 1 required for one frequency monitoring is multiplied by the number of the frequencies for monitoring to obtain time 2 required for all frequency monitoring. At last, time 2 required for all frequency monitoring is subtracted from time 3 when the monitor result becomes valid to obtain time 4 for intermitting monitoring. Monitoring is executed during time 2 required for all frequency monitoring, and a system is set to an idle state during time 4 when monitoring is intermitted. Thus, an intermittent idle monitoring method whose power consumption quantity is small and which has small possibility of failing in link establishment can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermittent idle monitor method for intermittently performing idle monitor for establishing a communication channel in a mobile communication system of time division multiplexing method.

[0002]

2. Description of the Related Art In recent years, the development of mobile communication has been remarkable. In particular, a personal handyphone system (hereinafter referred to as PHS), which is a mobile communication system using a digital system / time division multiplexing system, is expected to become widely used in the future.

PHS communicates by time division multiplexing. Hereinafter, the configuration will be described. FIG.
It is a time division multiplexing system block diagram of the conventional PHS base station. As shown in the figure, in the PHS base station, the frame unit 11 of 5 msec is time-divided into the slots 12 of 625 μsec, the downlink slots 13, 14, 15, 16 transmit to the mobile station, and the uplink slots 17, 18, 19, 20 carry out. Receiving from mobile device. Then, the time division multiplexed slots 13 and 17, 14 and 18, 15 and 19,
Four types of communication are performed at the same time, with 16 and 20 transmission / reception 2 slots as one set. At this time, idle monitoring is performed in preparation for the establishment of a link for a communication channel in a slot not used for communication. The idle monitor monitors the surrounding radio wave condition while changing the frequency in advance, so that when a link for a communication channel with a mobile device needs to be established, an appropriate frequency and slot position are instantly selected. Is a function of. This idle monitor is always performed in a slot not communicating with the mobile device, and only the monitor performed within the time when the monitor result becomes valid is used as the monitor result.

[0004]

However, in the above-mentioned conventional configuration, when the number of frequencies to be monitored is small, the same frequency is repeatedly monitored within the time when the monitoring result becomes valid, so unnecessary monitoring is performed. There was a possibility to do. In addition, since there is a time lag between the monitoring and the establishment of the link, there is a problem that there is a large possibility that the link establishment will fail if communication by other base stations is started during that time. Was there.

The present invention is intended to solve the above problems, and an object thereof is to provide an unnecessary idle monitor and an intermittent idle monitor method capable of avoiding a failure in link establishment.

[0006]

In order to achieve the above object, the present invention intermittently performs idle monitoring according to the number of frequencies to be monitored, the time required for monitoring, and the time when the monitoring result is valid. .

Further, based on the idle monitor result, priorities are assigned in the order of channels suitable for communication with mobile stations, and when a link is established, the link with higher priority is monitored again to establish a link. It also has a link establishing means for fixing the intermittent time to a fixed time. Further, it has a link establishing means for changing the intermittent fixed time according to the number of times the link is established within a unit time.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, power consumption can be reduced because unnecessary monitoring is eliminated by performing monitoring only once for one frequency within the time when the monitoring result is valid by the above method. Can be achieved. Moreover, since the link is established according to the immediately preceding monitor result, the possibility of failure in link establishment is reduced. In addition, the intermittent time can be shortened to improve the reliability of the monitoring result during the time period when the link is frequently established, and the intermittent time can be increased during the time period when the link is not established to reduce the power consumption.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an intermittent monitoring method according to an embodiment of the present invention, and FIG. 2 is a flowchart of a re-monitoring method according to an embodiment of the present invention. As shown in the figure, the monitoring result of the communication channel requires several consecutive frames. Therefore, it takes 1 time to monitor 1 frequency. The time 2 required for all frequency monitoring is determined by the number of frequencies to be monitored. The time 4 in which the monitoring is intermittent is the time 4 obtained by subtracting the time 2 required for all frequency monitoring from the time 3 when the monitoring result is valid. 5 is the time for one frame.

To explain the operation of the above configuration, the time 5 (5 msec) of one frame is multiplied by the number of continuous frames (4 frames) required for the monitor result to obtain the time 1 (20 msec) required for one frequency monitoring. Next, the time 1 (20 msec) required for one frequency monitor is multiplied by the number of monitored frequencies (5 frequencies) to obtain the time 2 (100 msec) required for all frequency monitoring. Finally, the time 2 (100 msec) required for all frequency monitoring is subtracted from the time 3 (800 msec) when the monitor result is valid to obtain the time 4 (700 msec) in which the monitor is intermittent. From these calculations, the PHS base station monitors for the time 2 (100 msec) required for all frequency monitoring, and puts the monitor in the idle state for an intermittent time 4 (700 msec).

Further, in the state where the intermittent idle monitor is repeatedly performed as shown in FIG. 2 (steps 1 and 2), priorities are assigned in order of channels suitable for a call according to the monitor result. Then, when an event occurs to establish the link of the communication channel, re-monitoring is performed from the highest priority (step 3, step 4), it is judged whether the link can be established (step 5), and the link can be established. Only in that case, the link is established (step 6). If the link cannot be established as a result of re-monitoring, the next highest priority is monitored (step 7), and the process is repeated until a link is established.

As described above, according to the intermittent idle monitoring method of this embodiment, after performing 100 msec monitoring, 7
Since the idle state is set to 00 msec, power consumption can be reduced. In addition, since the confirmation is performed by re-monitoring immediately before the link is established, the possibility of failure in link establishment is reduced.

The operation of the above configuration will be described. An intermittent time (1 mse) set after all frequencies are monitored.
Only c) enters the idle state. This intermittent time uses a constant value that is set regardless of the number of frequencies to be monitored and the time 3 during which the monitoring result is valid. When establishing a link, depending on the set time, the time when the monitor result becomes valid 3
It is possible to use previously monitored results. For this reason, a method is used in which the above-mentioned priorities are given and re-monitoring is performed from the highest priority to establish a link.

The intermittent time is changed by counting the number of times of link establishment per unit time.
The intermittent time is shortened as the number of times of link establishment is increased within the unit time. This shortens the monitor interval,
A new monitoring result is obtained when establishing a link, which reduces the possibility of link establishment failure. Also,
The smaller the number of times the link is established in a unit time, the longer the intermittent time. As a result, the idle state becomes longer and the power consumption can be reduced. By this method, the intermittent time is changed depending on the link establishment state of the base station, so that a base station that performs idle monitoring corresponding to the frequency of link establishment that differs depending on the time zone and the place where the base station is installed can be obtained. .

[0015]

According to the present invention, the idle monitor intermittent time is changed according to conditions such as the number of frequencies to be monitored, the time during which the monitor result is valid, and the number of times the link is established in a unit time. By performing monitoring again before establishing a link and determining whether the link can be established and establishing the link, it is possible to realize an intermittent idle monitoring method that consumes less power and is less likely to fail in link establishment. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an intermittent monitoring method according to an embodiment of the present invention.

FIG. 2 is a flowchart of a remonitoring method according to an embodiment of the present invention.

FIG. 3 is a block diagram of a conventional PHS base station time division multiplexing system.

[Explanation of symbols]

 1 1 Time required for frequency monitoring 2 Time required for all frequency monitoring 3 Time required for valid monitoring results 4 Time required for intermittent monitor 5 Time required for 1 frame

Claims (4)

[Claims] 1. A intermittent idle monitor method for intermittently performing idle monitor for establishing a communication channel in a slot in which communication is not performed in a system for performing mobile communication by time division multiplexing with a mobile device. Then, the intermittent idle monitoring method is characterized by setting the number of frequencies to be monitored, the time required for the monitoring, and the intermittent time depending on the time when the monitoring result is valid. 2. A priority is set in the order of channels suitable for communication with a mobile device based on the idle monitor result, and when a link is established, the link is established by monitoring again from the highest priority. The intermittent idle monitoring method according to claim 1. 3. The intermittent idle monitoring method according to claim 2, further comprising link establishing means for fixing the intermittent time to a fixed time. 4. The intermittent idle monitoring method according to claim 2, further comprising link establishing means for changing the intermittent fixed time period according to the number of times of link establishment performed within a unit time.