JP2001157244A - Phs (r) system and data communication speed switching method used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PHS that can enhance a connection rate in the case of hand-over and reduce the cost for re-connection due to failed hand-over. SOLUTION: In steps S1, S2, a radio state is measured at an interval of 1.2 second during communication of 64k data. In the case that a hand-over condition is established in a step S3, an IAFS card is informed of a CH switching notice in a step 4 to release a radio resource, a CS corresponding to 64k data communication is retrieved in a step S5. When a CS corresponding to 64k data communication is not found out in a step S6, retrieval processing of a CS corresponding to 32k data communication is conducted in a step S8, and when the CS is found out in a step S9, 32k data communication connection processing is conducted in a step S10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PHS system and a data communication rate switching method used therewith, and more particularly to a PHS system.
S (Personal Handyphone Sys)
old CS (Cell Site)
for PSs: PHS base station).

[0002]

2. Description of the Related Art Conventionally, in a PHS system, 6
Reconnection-type handover occurs during 4K data communication, and 6
If there is no 4K data communication compatible CS around, the old CS
Perform the return process to

In the case of performing the switching process, the receiving level of the old CS is low, and the switching cannot be performed in many cases. Even if switching back, the handover condition is often satisfied immediately. As described above, when the handover destination CS for 64K data communication is not found,
The radio is disconnected.

FIG. 6 shows a control flow of the conventional PHS system. This control flow shows a handover process during 64K data communication. Referring to FIG.
From the control flow of the HS system, the PS (Personal
The operation inside the station (PHS terminal) will be described.

[0005] During the 64K data communication, the radio control unit:
The wireless state measurement is performed at two-second intervals (step S in FIG. 6).
31, S32). Here, when the handover condition is satisfied (step S33 in FIG. 6), the PS is set to PIAFS (PH).
S Internet Access Forum S
notification of a CH (channel) switching (ON) to the standard card to release radio resources (step S in FIG. 6).
34), a CS search corresponding to 64K data communication is performed (step S35 in FIG. 6).

[0006] When a 64K-compatible CS is found (step S36 in Fig. 6), the PS reconnects for 64K data communication (step S37 in Fig. 6). If there is no 64K compatible CS (step S36 in FIG. 6), the PS switches back to the old CS and performs processing (step S38 in FIG. 6).

[0007] When the return processing is successful (step S39 in FIG. 6), the PS returns during the 64K data communication (step S40 in FIG. 6). When it becomes possible to recover during 64K data communication including reconnection, CH switching notification (OF
F) to the PIAFS card. If the return processing has failed (step S39 in FIG. 6), the PS is set to PIAFS.
Notify the card of completion of cutting (steps S41 and S41 in FIG. 6)
42).

FIG. 7 shows a sequence of a conventional PHS system, in which there is no CS corresponding to 64K when handover is performed, switching back fails, and radio release is performed.

As shown in FIG. 7, when the handover condition is satisfied, the PS terminal notifies the PIAFS card of a CH switching notification (ON) indicating the start of handover, and temporarily stops data communication.

If there is no 64K data communication compatible CS and switching back fails, the PS notifies the PIAFS card of disconnection completion. Data communication is completely terminated by this message notification.

[0011]

SUMMARY OF THE INVENTION The above-mentioned conventional PHS
In the system, when performing 64K data communication, it is necessary to secure two channels of the base station's channel resources, and since all the installed base stations are not compatible with 64K data communication, CSs supporting 64K data communication are required. Is more likely to occur.

If handover fails, the data transmitted and received up to that point is wasted, and it is not possible to retransmit the data from the middle or to receive the data from the middle. In addition, a cost is required for making an outgoing connection again.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to improve the connection rate at the time of handover and reduce the cost at the time of reconnection due to handover failure.
An object of the present invention is to provide an S system and a data communication speed switching method used therefor.

[0014]

A PHS system according to the present invention comprises a PHS (Personal Handypho).
ne system) A PHS system that performs a return process to an old PHS base station when a reconnection type handover occurs during 64K data communication in a terminal and there is no PHS base station supporting 64K data communication around the terminal. The PHS terminal is provided with means for switching from 64K data communication to 32K data communication before performing the switching process when a reconnection type handover occurs and there is no PHS base station compatible with 64K data communication in the vicinity.

The data communication rate switching method of the PHS system according to the present invention is a PHS (Personal Hand).
If a reconnection-type handover occurs during 64K data communication at a terminal and a PHS base station supporting 64K data communication is not around, the old PHS
A data communication speed switching method of a PHS system for performing a return process to a base station, wherein the return process is performed when the reconnection type handover occurs and there is no PHS base station compatible with 64K data communication in the vicinity. The PHS terminal includes a step of switching from 64K data communication to 32K data communication before.

That is, the PHS system of the present invention has
If a reconnection type handover occurs during 4K data communication and there is no CS supporting 64K data communication in the surrounding area, 64K
Data communication can be switched to 32K data communication.

When there is no CS supporting 64K data communication, there are two patterns, that is, a case where there is no base station itself and a case where all the channel resources are used by other terminals. In the PHS system of the present invention, a handover occurs during 64K data communication, and radio is not disconnected even when there is no 64K-compatible CS or when frequency resources for 64K data communication cannot be secured.

[0018] Therefore, 32K to 32K
Even during transition during data communication, CS search for 64K data communication can be performed while 32K data communication is maintained. If CS compatible with 64K data communication is found, it is possible to return to 64K data communication. It becomes possible.
Therefore, it is possible to improve the connection rate at the time of handover and reduce the cost at the time of reconnection due to handover failure.

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an internal configuration of a personal station (PHS terminal) according to an embodiment of the present invention. In FIG. 1, PS according to an embodiment of the present invention is PIAFS [PHS].
(Personal Handyphone System
em) Internet Access Forum
[Standard] card (hardware) 1 and P
IAFS card control unit 2, operation unit 3, wireless control unit 4
, A wireless control device 5 and an operation unit 6.

A PIAFS card 1 represents a card developed for PHS data communication, and includes a PIAFS card control unit 2
Performs command communication control with the PIAFS card 1 and
The command data received from the IAFS card 1 is converted into data in the system and transmitted to the operation unit 3. Also, P
The IAFS card control unit 2 converts the data received from the operation unit 3 into command data, and notifies the command data to the PIAFS card 1.

The operation unit 3 is performing data communication (32K / 64
K) acts as a relay station between the PIAFS card control unit 2 and the radio control unit 4, and is used as an LCD (Liquid Crystal).
l Display) Display control is performed.

The radio control unit 4 is connected to a CS (Cell Site).
for PSs (PHS base station) search, wireless connection with CS, switching connection of 32K / 64K data communication, and wireless monitoring during communication. The wireless control device 5 represents wireless hardware, and the operation unit 6 represents hardware used by the operation unit 3 such as an LCD and a path.

FIG. 2 is a flowchart showing the control operation of the PS according to one embodiment of the present invention, and FIG. 3 is a flowchart showing the switching operation from 32K data communication to 64K data communication of the PS according to one embodiment of the present invention. is there. FIG. 2 shows a control flow of a handover process during 64K data communication, and FIG.
A control flow is shown in which a search for a 4K-compatible CS is performed and the system returns during 64K data communication.

FIG. 4 illustrates a PS 32 according to one embodiment of the present invention.
FIG. 5 is a sequence chart showing an operation when there is no K-compatible CS, and FIG. 5 is a sequence chart showing an operation when a PS has a 32K-compatible CS according to an embodiment of the present invention. FIG. 4 shows an operation in a case where there is no CS supporting 64K, no CS supporting 32K, handover fails, and radio release is performed when performing handover, and FIG.
Shows an operation when there is no CS corresponding to 64K when performing handover, there is a CS corresponding to 32K, and the 32K data communication connection is successful.

The control operation of the PS according to one embodiment of the present invention will be described with reference to FIGS. FIG.
And the processing operation shown in FIG. 3 is realized by the above-described units of the PS executing a program of a control memory (not shown),
ROM (read only memory) or I
A C (integrated circuit) memory or the like can be used.

During the 64K data communication, the wireless control unit 4 measures the wireless condition at 1.2 second intervals (steps S1 and S2 in FIG. 2). Here, when the handover condition is satisfied (step S3 in FIG. 2), the PS is set to the PIAFS card 1
, A CH (channel) switching notification (ON) is notified to release radio resources (step S4 in FIG. 2), and a CS search corresponding to 64K data communication is performed (step S5 in FIG. 2).

If a CS corresponding to 64K is found (step S6 in FIG. 2), the PS reconnects for 64K data communication (step S7 in FIG. 2). The process up to this point is the conventional PHS
Same as the system.

If there is no CS corresponding to 64K, PS becomes 3
A search process for a 2K data communication compatible CS is performed (step S8 in FIG. 2). If there is CS (step S9 in FIG. 2), P
S performs a 32K data communication connection process (step S in FIG. 2).
10).

When there is no CS (step S in FIG. 2)
9), the PS performs a switchback process as in the conventional PHS system (step S11 in FIG. 2). When the return processing is successful (step S12 in FIG. 2), the PS returns during the 64K data communication (step S13 in FIG. 2).

When it is possible to recover during the 64K data communication including the reconnection, the CH switching notification (OFF) is set to P
Notify the IAFS card 1. If the switchback processing has failed (step S12 in FIG. 2), the PS notifies the PIAFS card 1 of the completion of disconnection (steps S14 and S1 in FIG. 2).
5).

After switching from during 64K data communication to during 32K data communication (step S21 in FIG. 3), the PS searches for CS compatible with 64K data communication every 10 seconds during 32K data communication (step S22 in FIG. 3).

When a CS corresponding to 64K data communication is found (step S23 in FIG. 3), the PS issues a CH switching notification (O
N) is notified to the PIAFS card 1 to release the wireless communication (step S24 in FIG. 3), and a connection process for 64K data communication is performed (step S25 in FIG. 3).

When the 64K data communication connection processing is completed, the PS issues a communication speed switching notification (64K) and a CH switching notification (OFF).
(Steps S26 and S27 in FIG. 3). As a result, the PS returns during the 64K data communication (step S28 in FIG. 3).

4 and 5, the PS according to one embodiment of the present invention is the same as the conventional PHS system up to the portion where there is no CS corresponding to 64K. Performing the search process is different.

If no CS is found in the CS search processing, a switchback processing is performed as in the conventional PS system (see FIG. 4). If CS is found in CS search processing, 32K data communication connection processing is performed (FIG. 5).
reference). When transiting to the 32K data communication state, the PIAFS card 1 is notified of a communication speed switching notification (32K) and a CH switching notification (OFF). The communication speed switching notification is a message newly added to notify the PIAFS card 1 that the communication speed has changed.

As described above, in this embodiment, the handover occurs during the 64K data communication, and the radio is disconnected even when there is no 64K compatible CS or when the frequency resources for the 64K data communication cannot be secured. There is no.

Further, in this embodiment, even if the transition from the 64K data communication to the 32K data communication is performed, the CS search corresponding to the 64K data communication can be performed while the 32K data communication is maintained. If found, it can return to 64K data communication. As a result, it is possible to improve the connection rate at the time of handover and to reduce the cost at the time of reconnection due to a handover failure.

[0038]

As described above, according to the present invention, P
In a PHS system in which a reconnection type handover occurs during 64K data communication in an HS terminal and a PHS base station corresponding to 64K data communication is not around, a reconnection type handover is performed in a PHS system that performs a return process to an old PHS base station. If the PHS terminal has occurred and there is no PHS base station compatible with 64K data communication around
By switching from K data communication to 32K data communication, there is an effect that the connection rate at the time of handover can be improved and the cost at the time of reconnection due to handover failure can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an internal configuration of a PS according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a control operation of a PS according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a switching operation of the PS from 32K data communication to 64K data communication according to an embodiment of the present invention.

FIG. 4 shows a 32K CS for PS according to an embodiment of the present invention.
6 is a sequence chart showing an operation in a case where no operation is performed.

FIG. 5 shows a 32K CS for PS according to an embodiment of the present invention.
6 is a sequence chart showing the operation in the presence case.

FIG. 6 is a flowchart showing a control operation of a PS according to a conventional example.

FIG. 7 is a sequence chart showing an operation of a conventional PHS system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PIAFS card 2 PIAFS card control part 3 Operation part 4 Radio control part 5 Radio control device 6 Operation part device

Claims (6)

[Claims] 1. A PHS (Personal Handy)
A PHS system that performs a return process to an old PHS base station when a reconnection-type handover occurs during 64K data communication in a terminal and a PHS base station supporting 64K data communication is not around,
The PHS terminal has means for switching from 64K data communication to 32K data communication before performing the switching process when the reconnection type handover occurs and there is no PHS base station supporting 64K data communication in the vicinity. PHS system. 2. The means for switching to 32K data communication includes: means for searching for a PHS base station corresponding to the 64K data communication during the 32K data communication; and means for performing wireless communication when a PHS base station corresponding to the 64K data communication is found. 2. The PHS system according to claim 1, further comprising means for performing connection processing of the 64K data communication after releasing the communication. 3. The PHS according to claim 2, wherein the means for switching to the 32K data communication notifies a communication speed switching notification and a channel switching notification after the completion of the connection processing of the 64K data communication. system. 4. A PHS (Personal Handy)
(Phone System) Data communication speed switching of the PHS system for performing a return process to the old PHS base station when a reconnection type handover occurs during 64K data communication at a terminal and there is no PHS base station supporting 64K data communication around Switching the 64K data communication to the 32K data communication before performing the reverting process when the reconnection type handover occurs and there is no PHS base station supporting the 64K data communication in the vicinity.
A data communication speed switching method provided in an HS terminal. 5. The step of switching to 32K data communication includes searching for a PHS base station corresponding to the 64K data communication during the 32K data communication,
5. The data communication speed switching method according to claim 4, further comprising: performing a connection process for the 64K data communication after releasing the radio when a PHS base station compatible with the K data communication is found. 6. The data according to claim 5, wherein the step of switching to the 32K data communication notifies a communication speed switching notification and a channel switching notification after the completion of the connection processing of the 64K data communication. Communication speed switching method.