JP7214311B2 - PHS terminal - Google Patents

Description

The present invention relates to a PHS (Personal Handy-phone System) terminal, and more particularly to a PHS terminal having a control channel search function.

Conventionally, two channels, 12CH and 18CH, can be used as control channels of BS (Base Station) of office (PBX, private branch exchange) in PHS. , registers and stores the control channel of that BS. Then, in order to search for the office BS, the PHS terminal first searches one of the stored control channels (12CH, for example). As a result, when there is no BS in the office that can be listened to, the procedure is to wait for a predetermined time (for example, 10 seconds) and then search for the other control channel (for example, 18CH).

Also, there is known a PHS wireless mobile station that efficiently resynchronizes when synchronization is lost due to radio wave interference with a wireless control signal from a connection device (for example, Patent Document 1). reference.). This PHS radio mobile station has a storage unit that holds the time difference between the transmission timings of logical control channels (LCCH) by two control frequencies from a connecting device (BS), and is synchronized with the logical control channel by one of the control frequencies. In this state, if this channel synchronization becomes abnormal due to radio wave interference, resynchronization is performed with the logical control channel of the other control frequency based on the information in the storage unit.

JP-A-2000-78659

By the way, with the recent increase in mobile communication traffic, the number of control channels that can be used in PHS has been increased from 2 channels to 4 channels. Therefore, it is necessary to search for an appropriate control channel from among the four channels so as to be able to wait for it. , 12CH and 18CH), but cannot search the other two channels (eg, 35CH and 37CH).

On the other hand, since the number of usable control channels has increased from 2 to 4, it is expected that the search will take a longer time than in the case of the conventional 2 channels, but it is possible to enter the standby state as soon as possible. desired.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a PHS terminal that can quickly enter a standby state (a communicable state) in a PHS that can use four channels.

In order to solve the above-mentioned problems, the invention according to claim 1 provides any two different control channels out of a first control channel, a second control channel, a third control channel and a fourth control channel. by registering an extension number in the first base station that can use the two control channels that can be used in the first base station are registered as control channels for home search, and are registered for home search. A PHS terminal using two control channels other than the two control channels obtained as control channels for roaming search , wherein the area of the first base station, the first control channel and the second control channel Searching for a control channel in any of an area of at least one second base station where any two different control channels of the control channel, the third control channel and the fourth control channel can be used. one of the two control channels for home search is searched, and after a predetermined period of time if the standby state is not established, one of the two control channels for roaming search is searched. After a predetermined period of time if no standby state is established , the other control channel of the two home search control channels is searched, and after a predetermined period of time if no standby state is established, the two control channels for roaming search are searched. It is characterized by repeating a search procedure of searching for the other control channel out of the control channels until the standby state is reached.

The invention according to claim 2 is characterized in that, in the PHS terminal according to claim 1, the predetermined time at the beginning of the search procedure is set shorter than the predetermined time in the subsequent search procedure. and

According to the invention of claim 1, first, one of the two control channels for home search of the first base station whose extension number is registered, that is, the control channel that is most likely to be in the waiting state In order to search for a control channel that is thought to be a Next, if it does not enter the standby state, it is possible that the user has moved from the area of the first base station to the area of the second base station. By searching one of the control channels, it is possible to enter the standby state early.

Furthermore, in order to search the other control channel of the two control channels for the home search of the first base station, which is considered to be likely to be in the standby state as described above, if it is not in the standby state, It is possible to enter a standby state. If the mobile station still does not enter the standby state, it searches for the other of the two unregistered control channels for roaming search, so it is possible to reliably enter the standby state.

According to the second aspect of the invention, the predetermined time at the beginning of the search procedure, for example, the predetermined time in the first search procedure, is the predetermined time in the subsequent search procedure, that is, the second and subsequent search procedures. is set shorter than the predetermined time in . That is, in the first search procedure, the search is performed sequentially after waiting for a short period of time, so it is possible to quickly enter the standby state. On the other hand, in the second and subsequent search procedures, since the search is performed sequentially after waiting for a long time, for example, there is no need to repeat the sleep mode and activation in a short time, and battery consumption and deterioration can be suppressed.

1 is a schematic configuration block diagram showing a PHS terminal according to an embodiment of the invention; FIG. FIG. 2 is a first explanatory diagram showing a control channel search method of the PHS terminal of FIG. 1; FIG. 3 is a second explanatory diagram showing a search method continued from FIG. 2; 2 is a flow chart showing a control channel search method of the PHS terminal of FIG. 1; FIG. 2 is a conceptual diagram showing a situation in which the PHS terminal in FIG. 1 moves between areas A and B and is powered on in area B; FIG. 4 is a diagram showing an example of control channel combinations when there are three base stations in the embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments.

1 to 5 show an embodiment of the invention, and FIG. 1 is a schematic configuration block diagram showing a PHS terminal 1 according to this embodiment. This PHS terminal 1 differs from conventional PHS terminals in the method and function of searching for control channels, and the rest of the configuration is the same as that of conventional PHS terminals. It has become. That is, the sound or the like from the microphone is signal-processed by the signal processing section 2, modulated by the modulation section 31, and sent to the outside via the transmission section 32 and the antenna 5. FIG. In addition, the external sound received by the antenna 5 and the receiver 42 is demodulated by the demodulator 41, signal-processed by the signal processor 2, and output from the speaker. On the other hand, the central processing unit 7 controls the channel switching unit 6 to switch the control channel used by the transmitting unit 32 and the receiving unit 42 .

Next, the method and function of searching for a control channel by the PHS terminal 1, more specifically, the method of searching for a base station that can stand by in an environment where a plurality of base stations are operated in an office will be described. Here, in this embodiment, as shown in FIG. 5, the control channels available in base station A (BS(A)) are 12CH (first control channel) and 18CH (second control channel). , and that the area A is within range and ready for waiting (communication is possible). Similarly, the control channels that can be used in base station B (BS(B)) are 35CH (third control channel) and 37CH (fourth control channel), and standby within area B is possible (communication is possible). Suppose that

In addition, two control channels can be registered in the extension PHS terminal 1. In this embodiment, the PHS terminal 1 has an extension number registered in the base station A and uses the control channels 12CH and 18CH of the base station A. shall be registered. For example, when a user possessing and using the PHS terminal 1 moves between areas A and B or turns on the power in area B, the control channel is switched as follows. Search and make it ready for standby. This search method/function is performed by the channel switching section 6 and the central processing section 7. FIG.

First, in the first search procedure, as shown in FIG. 4, one of the registered control channels of 12CH or 18CH, which is 12CH in this embodiment, is searched as the first search (step S1). At this time, as shown in FIG. 2, it becomes possible to wait in area A at the timing of "home search". Here, the PHS terminal 1 first executes "home search" and then executes "roaming search".

Next, as shown in FIG. 4, if the waiting state is not entered ("N" in step S2), after waiting for a first predetermined period of time, one of the unregistered 35CH or 37CH is searched as a second search. A control channel, 35CH in this embodiment, is retrieved (step S3). At this time, as shown in FIG. 2, it becomes possible to wait in area B at the timing of "roaming search", and the first predetermined time is set to 2 seconds.

Subsequently, as shown in FIG. 4, if the waiting state is not established ("N" in step S4), after waiting for the first predetermined time, the other of the registered 12CH or 18CH is searched as the third search. A control channel, 18CH in this embodiment, is retrieved (step S5). At this time, as shown in FIG. 2, it becomes possible to wait in area A at the timing of "home search", and the first predetermined time is set to 2 seconds.

Furthermore, as shown in FIG. 4, if the waiting state is not entered ("N" in step S6), after waiting for the first predetermined time, as a fourth search, control of the other of the unregistered 35CH or 37CH is performed. A channel, 37CH in this embodiment, is retrieved (step S7). At this time, as shown in FIG. 2, it becomes possible to wait in area B at the timing of "roaming search", and the first predetermined time is set to 2 seconds.

Then, if the standby state is not established ("N" in step S8), such a search procedure (steps S1 to S8) is repeated until the standby state is established. At this time, as shown in FIGS. 2 and 3, each control channel is sequentially searched after the second predetermined time, and the second predetermined time is set to 10 seconds. In this way, the predetermined time at the beginning of the search procedure (first search procedure), that is, the first predetermined time, is greater than the predetermined time in subsequent search procedures (second and subsequent search procedures), that is, the second predetermined time. is set short. Here, the first predetermined time is set to a relatively short time that allows the user to quickly enter the standby state even if the user moves between areas A and B. This is set to a relatively long time that can suppress battery deterioration when, for example, the mobile phone is completely out of service.

According to this PHS terminal 1 and control channel search method, first, 12CH, which is one of the control channels of 12CH or 18CH of the base station A whose extension number is registered, that is, the user is in area A and the most Since 12CH, which is considered to be highly likely to enter the standby state, is searched for, it is possible to enter the standby state early. Next, if it does not enter the standby state, it is possible that the user has moved out of area A of base station A. Therefore, 35CH, which is one of the control channels 35CH and 37CH of unregistered base station B, is searched. This makes it possible to enter the standby state early.

Furthermore, if it does not enter the standby state, it searches for 18CH, which is the other control channel of the 12CH or 18CH of the base station A, which is considered to be likely to enter the standby state as described above, so that it enters the standby state early. becomes possible. If it still does not enter the standby state, it searches for 37CH, which is the other control channel of 35CH or 37CH of the unregistered base station B, so that it is possible to reliably enter the standby state.

In this way, even a PHS that can use four channels can enter the standby state early. Therefore, for example, as shown in FIG. and area B (between adjacent rooms or between upper and lower floors), or even when the power is turned on in area B, it is possible to immediately enter the within-range state.

Also, the predetermined time at the beginning of the search procedure, that is, the first predetermined time (2 seconds) in the first search procedure, is the predetermined time in the subsequent search procedure, that is, in the second and subsequent search procedures. It is set shorter than the second predetermined time (10 seconds). That is, in the first search procedure, the search is performed sequentially after waiting for a short period of time, so it is possible to quickly enter the standby state. On the other hand, in the second and subsequent search procedures, since the search is performed sequentially after waiting for a long time, for example, there is no need to repeat the sleep mode and activation in a short time, and battery consumption and deterioration can be suppressed.

Although the embodiments of the present invention have been described above, the specific configuration is not limited to the above-described embodiments. Included in the invention. For example, in the above embodiment, the predetermined time (waiting time) for searching in the first search procedure is 2 seconds, and the predetermined time for searching in the second and subsequent search procedures is 10 seconds. Other times may be set. For example, the predetermined time for searching in the first and second search procedures may be 2 seconds, and the predetermined time for searching in the third and subsequent search procedures may be 10 seconds. Also, during the search procedure, for example, after the search for 18CH in the second search procedure, it may be set to 10 seconds.

Also, the case where the control channels available at base station A are 12CH and 18CH and the control channels available at base station B are 35CH and 37CH has been described, but what combination of control channels can be used at each base station? It can be something like For example, the control channels available at base station A may be 12CH and 35CH, and the control channels available at base station B may be 18CH and 37CH.

Furthermore, the case where there are two base stations A and B and areas A and B has been described, but control channels can be searched in the same way when there are three or more base stations and areas. For example, as shown in FIG. 6, the control channels available at base station A (BS(A)) are 12CH and 18CH, area A is within range, and the control channels available at base station B (BS(B)) are are 35CH and 37CH, and area B is within range, and the control channels that can be used by base station C (BS(C)) are 12CH and 35CH, and area C is within range. is registered and 12CH and 35CH are registered.

In this case, for example, first search for 12CH after a predetermined time, second search for either 18CH or 37CH after a predetermined time, third search for 35H after a predetermined time, and fourth search for 18CH or 37CH after a predetermined time. Search for the other of 37CH. Alternatively, first search 35CH and after a predetermined time, second search either 18CH or 37CH after a predetermined time, third search 12H and after a predetermined time, fourth search the other of 18CH or 37CH. Search for

Here, for example, 12CH can be used by base station A (area A) and base station C (area C). It becomes possible to wait for 12CH at the timing of "home search". On the other hand, when the user who owns and uses the PHS terminal 1 is in area A, it becomes possible to wait for 12CH at the timing of "roaming search".

1 PHS terminal 2 signal processing unit 31 modulation unit 32 transmission unit 41 demodulation unit 42 reception unit 5 antenna 6 channel switching unit 7 central processing unit 12CH 1st control channel 18CH 2nd control channel 35CH 3rd control channel 37CH 4th control channel BS (A) Base station A
BS (B) Base station B
BS (C) Base station C

Claims (2)

By registering an extension number with a first base station capable of using any two different control channels out of a first control channel, a second control channel, a third control channel and a fourth control channel and two control channels available in the first base station are registered as control channels for home search, and two control channels other than the two control channels registered for home search are searched for roaming. A PHS terminal used as a control channel for the area of the first base station, and the area of the first control channel, the second control channel, the third control channel and the fourth control channel When searching for a control channel in any of at least one second base station area where any two different control channels can be used ,
searching for one of the two control channels for home search, and searching for one of the two control channels for roaming search after a predetermined period of time if no standby state is established; After a predetermined period of time if the standby state is not established , the other of the two control channels for home search is searched, and after a predetermined period of time if the standby state is not established, the two control channels for roaming search are searched. Repeat the search procedure of searching for the other control channel until the standby state is reached,
A PHS terminal characterized by: setting the predetermined time at the beginning of the search procedure to be shorter than the predetermined time in the subsequent search procedure;
The PHS terminal according to claim 1, characterized by:

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