JP3667596B2 - Catchphone function control method and system in PHS, and PHS terminal with catchphone function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a call waiting function control method and system in a PHS that provides a call waiting function in a PHS (Personal Handy-phone System), and a PHS terminal with a call waiting function.
[0002]
[Prior art]
Conventionally, when a call is received from another party during a call, the exchange notifies the user with a signal sound, and when the caller presses the hook switch, the current caller is put on hold, There is a call waiting service that can answer and switch to the other party by pressing the hook switch again. This call waiting service is realized by inserting a device for switching the communication partner for each hooking between the subscriber line and the exchange.
[0003]
[Problems to be solved by the invention]
However, when realizing the call waiting service with PHS, a significant change is required not only for the PHS terminal but also for the base station.
[0004]
Therefore, the present invention pays attention to the 64 kbit / s non-restricted information transmission service in order to solve the above-mentioned conventional problems, and by using the control sequence, the call waiting function in the PHS is easily realized. An object is to provide a control method and system, and a PHS terminal with a call waiting function.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a PHS compatible with the 64 kbit / s non-restricted information transmission service, when a call is received at a base station and a PHS terminal in a communication state on the first information channel, A step of confirming the presence or absence of a free communication slot among a plurality of communication slots for uplink and downlink, and if there is a free communication slot, notifies the PHS terminal of an information channel addition request instruction A step of receiving the information channel addition request instruction from the base station at the PHS terminal and notifying the user that there is an incoming call; and an information channel addition request to the base station by the user operation In response to the information channel addition request from the PHS terminal at the base station, And establishing a second information channel at the PHS terminal after the second information channel is established and placing the first information channel on hold. It is characterized by that.
[0006]
With the above configuration, the call waiting function in the PHS can be easily realized by a simple function addition without hardware change on the base station side (64 kbit / s non-restricted information transmission service correspondence).
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0008]
FIG. 1 shows a schematic configuration of the present embodiment, which includes a PHS terminal 1 and a base station (64 kbit / s unrestricted information transmission service correspondence) 2, and the base station 2 is connected to a telephone network. The PHS terminal 1 includes a radio unit 11, a control unit 12, a display unit 13, and an operation unit 14, and the base station 2 includes a control unit 21 and a radio unit 22. The radio unit 11 of the PHS terminal 1 and the radio unit 22 of the base station 2 divide one radio frequency into eight by channel division by TDMA / TDD (Time Division Multiple Access / Time Division Duplex) method, Wireless communication is performed at one frequency on the downlink. Of these eight channels, one control channel is used for each of uplink and downlink, and the base station and the PHS terminal communicate with each other through the remaining six channels. Data communication of 32 kbit / s can be performed with one call channel, and data communication of 64 kbit / s is realized by using two call channels.
[0009]
When there is an incoming call to the PHS terminal 1 that is in a communication state on the first TCH (Information Channel: Traffic Channel), the base station 2 checks the presence or absence of an empty communication slot (information channel) by the control unit 21. . When there is an empty communication slot, the radio unit 22 notifies the PHS terminal 1 of a TCH addition request instruction. When receiving the TCH addition request instruction from the wireless unit 11 of the PHS terminal 1, the control unit 12 notifies the user that the second incoming call has been received by light, sound, vibration or the like on the display unit 13. When the user receives the second incoming call, the radio unit 11 notifies the TCH addition request by performing an operation such as pressing a button on the operation unit 14.
[0010]
When the base station 2 receives the TCH addition request from the radio unit 22, the base station 2 establishes the second TCH with the PHS terminal 1. After the second TCH is established, the first TCH is placed on hold and the second TCH is placed on the call. Switching the TCH to be in a call state and disconnecting the TCH are performed by operating the operation unit 14 of the PHS terminal 1 such as pressing a button.
[0011]
Next, the operation of the present embodiment will be described in detail with reference to the flowchart shown in FIG. When there is an incoming call to the PHS terminal 1 in the communication state on the first TCH (S1, S2), the base station 2 confirms whether or not there is a free communication slot by the control unit 21 (S3). When there is a vacant communication slot, the radio unit 22 notifies the PHS terminal 1 of the TCH addition request instruction using the SACCH (low speed associated control channel) of the first TCH (S4).
[0012]
FIG. 3 shows the format of a physical slot for communication. ACCH is a bidirectional channel attached to TCH (information channel), and performs control information and user packet data transfer necessary for call connection. The ACCH that is always associated with the TCH is SACCH (slow associated control channel), and the channel that temporarily steals the TCH and performs high-speed data transfer is FACCH (fast associated control channel). Using the SACCH information field always associated with this TCH, the base station 2 notifies the PHS terminal 1 of a TCH addition request instruction, and the PHS terminal 1 notifies the base station 2 of the TCH addition request.
[0013]
Next, when the TCH addition request instruction is received by the wireless unit 11 of the PHS terminal 1, the control unit 12 notifies the user that the second incoming call has been received by light, sound, vibration or the like on the display unit 13 (S5). When the user receives the second incoming call, by performing an operation such as pressing a button on the operation unit 14 (S7), the radio unit 11 notifies the TCH addition request using the SACCH of the first TCH (S8). When the base station 2 receives the TCH addition request from the radio unit 22, the base station 2 establishes the second TCH with the PHS terminal 1 (S9). The procedure so far is based on the RCR STD-28 64 kbit / s unrestricted information transmission service communication second TCH addition (with CS instruction) control sequence.
[0014]
After the second TCH is established, the second TCH is placed in a call state, the first TCH is placed in a hold state (S10), and thereafter the TCH to be placed in a call state is switched by a user operation such as pressing a button on the operation unit 14 (S12, S15).
[0015]
FIG. 4 shows a state of call / hold switching of the physical slot for communication in the present invention. Of the three communication physical slots for uplink and downlink according to the TDMA / TDD scheme, the base station 2 transmits using the downlink T # 1 corresponding to the first TCH, and the PHS terminal 1 receives it as R # 1. To do. The PHS terminal 1 transmits using uplink T # 1 corresponding to the first TCH, and the base station 2 receives it as R # 1. When there is an incoming call from another, T # 3 and R # 3 are associated with the second TCH and communication is established. Then, R # 1 and T # 1 corresponding to the first TCH and R # 3 and T # 3 corresponding to the second TCH are switched, and one of them is called and the other is put on hold.
[0016]
In addition, disconnection of the TCH in the call state is also performed by an operation such as pressing a button on the operation unit 14 (S16, S17).
[0017]
【The invention's effect】
As described above, according to the present invention, there is no hardware change on the base station side (compatible with 64 kbit / s unrestricted information transmission service), and the information field of the SACCH always associated with the information channel is used to change the PHS terminal from the base station. The PHS terminal notifies the base station of the information channel addition request instruction, and the PHS terminal is provided with a communication physical slot switching function to easily realize the call waiting function in the PHS. it can.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an embodiment according to the present invention.
FIG. 2 is a flowchart of an embodiment according to the present invention.
FIG. 3 is a diagram showing a format of a communication physical slot.
FIG. 4 is a time chart showing call / hold switching of a physical slot for communication in the present invention.
[Explanation of symbols]
1 PHS terminal 2 Base station

Claims (6)

In PHS corresponding to 64 kbit / s unrestricted information transmission service,
When the base station receives an incoming call to the PHS terminal that is in a communication state on the first information channel, it confirms whether there is a free communication slot among a plurality of communication slots for uplink and downlink. Steps,
If there is an available communication slot, notifying the PHS terminal of an information channel addition request instruction;
In the PHS terminal, receiving the information channel addition request instruction from the base station, notifying the user that there is an incoming call,
Notifying the base station of an information channel addition request by the user operation;
In the base station, receiving the information channel addition request from the PHS terminal and establishing a second information channel with the PHS terminal;
A call waiting function in the PHS including the step of setting the second information channel in a call state and setting the first information channel on hold after the second information channel is established in the PHS terminal. Control method. The base station notifies the PHS terminal of the information channel addition request instruction using the SACCH (low-speed associated control channel) of the first information channel,
2. The call waiting function control method in PHS according to claim 1, wherein the information channel addition request is notified from the PHS terminal to the base station using the SACCH of the first information channel. In PHS corresponding to 64 kbit / s unrestricted information transmission service,
When the base station receives an incoming call to a PHS terminal in a communication state on the first information channel, the base station confirms whether there is a free communication slot among a plurality of communication slots for uplink and downlink When,
A means for notifying the PHS terminal of an information channel addition request instruction when there is an empty communication slot;
Means for receiving an information channel addition request from the PHS terminal and establishing a second information channel with the PHS terminal;
The PHS terminal receives the information channel addition request instruction from the base station, and notifies the user that there is an incoming call;
Means for notifying the base station of the information channel addition request by an operation of the user;
A call waiting function control system in a PHS, comprising: means for setting the second information channel in a call state and setting the first information channel on hold after the second information channel is established. The base station notifies the PHS terminal of the information channel addition request instruction using the SACCH (low-speed associated control channel) of the first information channel,
The system according to claim 3, wherein the PHS terminal notifies the base station of an information channel addition request using the SACCH of the first information channel. In PHS corresponding to 64 kbit / s unrestricted information transmission service,
If there is an incoming call during a call on the first information channel , check whether there is an available communication slot out of a plurality of communication slots for uplink and downlink, and request an information channel addition from the base station Means for receiving instructions and notifying the user of an incoming call;
Means for notifying the base station of the information channel addition request by an operation of the user;
A PHS with call waiting function, comprising: means for setting a second information channel with the base station after the establishment of the second information channel and setting the second information channel to a call state and placing the first information channel on hold Terminal. Receiving the information channel addition request instruction from the base station using the SACCH (low speed associated control channel) of the first information channel;
6. The PHS terminal with call waiting function according to claim 5, wherein an information channel addition request is notified to the base station using the SACCH of the first information channel.

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