JP2004135036A - Incoming voice call control method and mobile station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain the state of an incoming call in the packet communication as much as possible. <P>SOLUTION: On condition that a local zone level L exceeds a permissible level Lz, no zone transition is allowed as far as the value of a level deterioration counter does not exceed a specified value in the case that the local zone level L exceeds a deterioration level Lth. Consequently, the state of the incoming call can be maintained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a voice call control method and a mobile station when a voice call is received during packet communication.
[0002]
[Prior art]
2. Description of the Related Art Digital mobile communication systems (PDC (Personal Digital Cellular communication system), GSM (global system for mobile communication), IS-54, IS-95, etc.) are remarkably popularized, and support for data communication is important in mobile communication. It has become so. For this reason, a PDC-P (PDC Packet) system using a packet switching system, a GPRS (General Packet Radio System) system based on GSM, an HDR (High Data Rate) system based on IS-95, and the like have been developed. By using packet communication using such packets, it is possible to send and receive e-mails and access the Internet. Also, sending and receiving e-mails and accessing the Internet are performed using the current circuit switching system.
[0003]
[Problems to be solved by the invention]
By the way, during the transmission and reception of e-mails and packet communication accessing the Internet, for example, when a mobile station such as a mobile phone receives a voice call, the radio channel designation information is stored in the user packet channel (UPCH). It will be sent from the serving base station. The UPCH is one of the common access channels (CAC) in the control channel (CCH) as shown in FIG. Here, an outline of the channel configuration in the mobile communication network will be described with reference to FIG. 4. The radio channel includes an information channel (TCH) for transferring user information and a control channel (CCH), and the control channel is a common access channel. Channel (CAC) and User Specific Channel (USC).
[0004]
The common access channel is a one-way channel for broadcasting control information from the network to the mobile station, and includes a broadcast channel (BCCH) for transferring information for location registration, information on a channel structure, information on a system, and a point. A multipoint bi-directional channel, consisting of a common control channel (CCCH) for transferring signaling information and a user packet channel (UPCH). In the common control channel, a paging channel (PCH) and an individual cell signaling channel (SCCH) are defined in order to perform a discontinuous reception operation of a mobile station. The user-specific channel is a point-to-point bidirectional channel, and includes an associated control channel (ACCH) which is a control channel associated with the TCH for transmitting signaling information and user packet data. As the associated control channel (ACCH), an FACCH that temporarily steals the TCH and performs high-speed data transfer is defined, and a SACCH that is a normal ACCH is defined. The information channel (TCH) is a point-to-point bidirectional channel, which is a channel for transferring user information and a user information control signal, and for transferring voice / facsimile information and the like.
[0005]
The UPCH is a point-multipoint bidirectional channel, and is a channel for transferring control signal information and user packet data. However, since the UPCH radio channel designation information cannot be inherited between base stations, when a mobile station that has received a voice call during packet communication shifts to a zone, it is no longer possible to maintain the incoming call reception state. There was a problem that it would.
By the way, when a packet is received and a voice call is received during a standby state, the mobile station is notified from the base station by a common control channel (CCCH). Then, the mobile station receiving the incoming voice call is not required to respond to the incoming voice call, and shifts to the information channel (TCH) according to the wireless channel designation information. Since the radio channel designation information after the transition to the TCH can be inherited between the base stations, the incoming call arrival state is maintained even if the zone transition is made before responding to the incoming call during standby. Does not occur.
[0006]
Accordingly, it is an object of the present invention to provide an incoming call control method and a mobile station capable of maintaining the incoming call state as much as possible when a voice call is received during packet communication.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the incoming call control method of the present invention, when a voice incoming interrupt occurs in a mobile station during packet communication, in the mobile station, even if its own zone level is below the permission level, When the own zone level exceeds the deterioration level, the operation of the zone shift is suppressed.
[0008]
Further, in the incoming call control method of the present invention, the mobile station detects whether or not the own zone level exceeds the deterioration level, on condition that the own zone level is equal to or less than the permission level at every predetermined timing, The mobile station may not be shifted to the zone until the value of the counter that is incremented each time it is detected that the count has exceeded the predetermined value.
Further, in the above-described incoming call control method of the present invention, the mobile station may perform zone transfer when the highest level of the peripheral zone level is higher than the own zone level by a connection permission level difference or more. Good.
[0009]
Next, the mobile station of the present invention capable of achieving the above object, when a voice call interruption occurs during packet communication, the local zone level is degraded on condition that the local zone level is lower than the permission level. Detection means for detecting whether or not the level exceeds the level, and control means for suppressing an operation of zone transition when the detection means detects that the zone level exceeds the deterioration level. I have.
[0010]
Further, in the mobile station according to the present invention, the control unit includes a counter that is incremented each time the detection unit detects that the own zone level exceeds the deterioration level, and the value of the counter is set to a predetermined value. Until the mobile station reaches the zone, the mobile station may not be shifted to the zone.
Further, in the mobile station according to the present invention, the control means may shift the zone when the highest peripheral zone level is higher than the own zone level by a connection permission level difference or more.
[0011]
According to the present invention, even if the own zone level is equal to or lower than the permission level, the zone shift operation is suppressed as long as the own zone level exceeds the deterioration level. At this time, the zone transition is minimized so that the incoming state of the voice call can be maintained. Thus, the incoming call responsive state can be continued, so that the incoming call can be answered as soon as the packet communication is completed.
Further, provided that the own zone level is equal to or lower than the permission level, the zone transfer is not performed until the number of times that the own zone level is detected as exceeding the deterioration level exceeds a predetermined number. When the zone is shifted, the zone is shifted when the highest level of the peripheral zone level is higher than the own zone level by the connection permission level difference or more. As described above, when a zone shift is required such that the packet communication cannot be continued due to the deterioration level or less, the zone shift is enabled. For this reason, even if it is possible to maintain the incoming call incoming state, it is possible to prevent the occurrence of packet communication interruption due to factors such as level deterioration.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a part of the configuration of a mobile communication network including a mobile station to which the voice termination control method of the present invention is applied.
A mobile communication network has a number of zones, of which only two, zone A and zone B, are shown in FIG. Zone A is provided with a base station 2a, and zone B is provided with a base station 2b. As described above, the base station is provided for each zone, and these base stations including the base stations 2a and 2b are accommodated in the mobile communication switching center 3. The mobile station 1 serving as a mobile phone is located in the zone A, and the mobile station 1 can perform packet communication, voice communication, and the like via the base station 2a and the mobile communication switching center 3. Has been.
[0013]
FIG. 2 is a block diagram schematically illustrating a hardware configuration of the mobile station 1 according to the embodiment of the present invention.
In this figure, 10 is a CPU (central processing unit) for controlling the entire mobile station, 11 is a ROM or flash for storing various control programs and various application programs such as an operating system and a native program, and various data and music files. A memory system (ROM / RAM) including a memory card such as a nonvolatile memory such as a memory and a volatile memory such as a DRAM, a display unit 12 such as a liquid crystal, and a key input unit 13 including a numeric keypad. Further, 14 is an antenna, 15 is a receiving unit including a high-frequency amplifier, a receiving mixer, an intermediate frequency amplifier and a demodulating unit, 16 is a transmitting unit including a modulating unit, a transmitting mixer, a transmitting power amplifying unit, and the like. A frequency synthesizer for supplying a high-frequency signal to the transmission mixer, a signal processing unit 18 for performing audio signal processing and the like, a microphone 19 for transmission, a speaker 20 for reception, an earphone jack 21, and a bus 22.
[0014]
When the mobile station 1 configured as described above is performing packet communication such as sending and receiving mails and accessing the Internet, and an interrupt of voice call occurs, the base station in which the UPCH wireless channel designation information is located is located. 2a, the mobile station 1 receives this, and the CPU 10 executes the voice incoming call control process. In this case, assuming that the mobile station 1 is moving from zone A to zone B as shown in FIG. 1, since the UPCH radio channel designation information cannot be inherited between base stations as described above, When the mobile station 1 shifts to the zone, it becomes impossible to maintain the incoming call receiving state. Therefore, in the voice incoming call control method according to the present invention, it is possible to respond to a voice incoming call when packet communication ends by restricting the mobile station 1 from shifting to a zone and maintaining the incoming call state as much as possible. .
[0015]
Prior to the description of the voice incoming call control process for executing the voice incoming call control method according to the present invention, zone transfer will be described.
As shown in FIG. 1, when the mobile station 1 is moving from the zone A to the zone B, a zone shift is performed so that the mobile station 1 can continue optimal packet communication or voice communication. Two kinds of zone transfer procedures are prepared for this zone transfer. The first zone transfer procedure is a zone transfer procedure for performing a zone transfer using a preset connection permission level difference when the electric field level is deteriorated. In this first zone shift procedure, it is detected that the electric field level of the own zone has become lower than the permission level that hinders communication, and the peripheral zones of the electric field level higher than the electric field level of the own zone by the connection permission level difference or more are detected. , And a zone transfer procedure for transferring to that zone.
[0016]
The second zone transfer procedure is a zone transfer procedure for performing zone transfer using a preset strong electric field level difference. In the second zone shift procedure, when there is a peripheral zone having an electric field level higher than the electric field level of the own zone by an electric field level difference or more than the electric field level of the own zone, the zone shift procedure for shifting to that zone is performed. I have. Then, when the statistics of the number of times the first zone transfer procedure and the second zone transfer procedure were performed were obtained, it was found that the number of times the second zone transfer procedure was performed was statistically overwhelmingly large. In the second zone shift procedure, the zone shift is performed when there is a peripheral zone having an electric field level higher than the electric field level of the own zone by a difference of the electric field level higher than the electric field level of the own zone. It does not mean that it has deteriorated. Therefore, packet communication can be continued even if the zone shift by the second shift procedure is restricted. The present invention uses such a principle to restrict the zone transfer according to the second transfer procedure so as to maintain the incoming call state as much as possible.
[0017]
Next, a voice incoming call control process for executing the voice incoming call control method according to the embodiment of the present invention will be described with reference to the flowchart shown in FIG.
The voice incoming call control process shown in FIG. 3 is started at predetermined timings when a voice incoming call interrupt occurs while the mobile station 1 is performing packet communication, and the own zone level L0 is set at step S10. It is determined whether or not the permission level Lz at which stable communication can be continued is exceeded. Here, when it is determined that the own zone level L0 exceeds the permission level Lz, the process proceeds to step S11, and a level deterioration counter described later is cleared. In this case, since stable packet communication can be continued without shifting to the zone, the voice incoming call control processing ends without performing subsequent processing. In this case, the incoming state is maintained because the zone is not shifted, and it is possible to respond to the incoming voice when the packet communication ends.
[0018]
If it is determined in step S10 that the own zone level L0 does not exceed the permission level Lz, the process branches to step S12 to determine whether or not the own zone level L0 exceeds the deterioration level Lth at which communication can be continued. Is determined. Here, if it is determined that the own zone level L0 exceeds the deterioration level Lth, the process proceeds to step S13, and the level deterioration counter is incremented by one. Next, in step S14, it is determined whether or not the count value of the level deterioration counter exceeds a predetermined value Nr. Here, if it is determined that the count value of the level deterioration counter does not exceed the predetermined value Nr, the packet communication can be continued without shifting to the zone, so that the voice incoming call control processing can be performed without performing the subsequent processing. finish. In this case, the incoming state is maintained because the zone is not shifted, so that it is possible to respond to the incoming voice when the packet communication ends. Note that the deterioration level Lth is set to a level lower than the permission level Lz.
[0019]
Further, when it is determined in step S14 that the count value of the level deterioration counter exceeds the predetermined value Nr, the process proceeds to step S15, and the maximum level max (Li) of the peripheral zone levels is set to the own zone level L0. It is determined whether or not the level exceeds the level obtained by adding the connection permission level difference ΔLs. The connection permission level difference ΔLs is a level that can be restored to a level at which stable communication can be performed when this level is added. Here, if it is determined that the maximum level max (Li) does not exceed the level obtained by adding the connection permission level difference ΔLs to the own zone level L0, the zone is not shifted. That is, the voice incoming call control process ends without performing the subsequent process. In this case, since the incoming call state is maintained, it is possible to respond to the incoming voice when the packet communication is completed.
[0020]
If it is determined in step S15 that the maximum level max (Li) exceeds the level obtained by adding the connection permission level difference ΔLs to the own zone level L0, the process shifts to that zone. As described above, when the own zone level does not exceed the permission level Lz for a predetermined time or more, zone transition is performed so that packet communication can be stably continued. However, when the zone is changed, the UPCH wireless channel designation information cannot be transferred to the base station in the shifted zone, so that the incoming call state of the voice call is cut off.
[0021]
If it is determined in step S12 that the own zone level L0 does not exceed the deterioration level Lth, the flow branches to step S16 to clear the level deterioration counter. In this case, since the own zone level L0 is an electric field level equal to or lower than the degradation level Lth, it is difficult to continue the packet communication, so that the zone levels of all the zones are detected and the zone shifts to the zone of the maximum zone level. To As described above, when the zone transition is required when the own zone level L0 becomes equal to or lower than the deterioration level Lth and the packet communication cannot be continued, the zone transition is enabled. For this reason, even if it is possible to maintain the incoming call incoming state, it is possible to prevent the occurrence of packet communication interruption due to factors such as level deterioration.
[0022]
The voice incoming call control process shown in FIG. 3 is executed at predetermined timings, and the level deterioration counter is incremented each time YES is determined in step S12. Therefore, on the condition that the own zone level L0 does not exceed the permission level Lz, the level deterioration counter counts the number of times that the own zone level L0 is determined to exceed the deterioration level Lth. One condition for shifting to the zone when the count value exceeds the predetermined value Nr is satisfied. However, as the predetermined value Nr is increased, the incoming call state of the voice call can be continued for a long time. For example, since the incoming call state can be maintained for a maximum of 30 seconds, it becomes possible to respond to an incoming voice call after the end of mail transmission or after the activation of the application is completed. Further, the voice incoming call control processing according to the present invention is based on a standard control method, and therefore can be implemented relatively easily.
[0023]
【The invention's effect】
As described above, according to the present invention, even when the own zone level is equal to or lower than the permission level, the zone shift operation is suppressed as long as the own zone level exceeds the deterioration level. At this time, the zone transition is minimized so that the incoming state of the voice call can be maintained. Thus, the incoming call responsive state can be continued, so that the incoming call can be answered as soon as the packet communication is completed.
Further, provided that the own zone level is equal to or lower than the permission level, the zone transfer is not performed until the number of times that the own zone level is detected as exceeding the deterioration level exceeds a predetermined number. When the zone is shifted, the zone is shifted when the highest level of the peripheral zone level is higher than the own zone level by the connection permission level difference or more. As described above, when a zone shift is required such that the packet communication cannot be continued due to the deterioration level or less, the zone shift is enabled. For this reason, even if it is possible to maintain the incoming call incoming state, it is possible to prevent the occurrence of packet communication interruption due to factors such as level deterioration.
[Brief description of the drawings]
FIG. 1 is a diagram showing a part of a configuration of a mobile communication network including a mobile station to which a voice termination control method of the present invention is applied.
FIG. 2 is a block diagram schematically showing a hardware configuration of a mobile station according to the embodiment of the present invention.
FIG. 3 is a flowchart of voice incoming call control processing for executing the voice incoming call control method according to the embodiment of the present invention;
FIG. 4 is a diagram showing a channel configuration in a mobile communication network.
[Explanation of symbols]
Reference Signs List 1 mobile station, 2a base station, 2b base station, 3 mobile communication switching station, 10 CPU, 11 memory system, 12 display section, 13 key input section, 14 antenna, 15 receiving section, 16 transmitting section, 17 synthesizer, 18 signal Processing unit, 19 transmitting microphone, 20 receiving speaker, 21 earphone jack, 22 bus, L0 own zone level, Lth deterioration level, Lz permission level, Li peripheral zone level, Nr predetermined value, ΔLs connection permission level difference

Claims (6)

When an incoming voice call interrupt occurs in a mobile station during packet communication, the mobile station changes its zone if its own zone level exceeds the degradation level, even if its own zone level is below the permission level. An incoming call control method characterized by suppressing the operation of (1). The mobile station detects whether or not the own zone level exceeds the deterioration level, on condition that the own zone level is equal to or lower than the permission level at every predetermined timing, and is incremented each time it is detected that the own zone level has exceeded the deterioration level. 2. The method according to claim 1, wherein the mobile station is not shifted to a zone until the counter value reaches a predetermined value. 3. The voice incoming call according to claim 2, wherein the mobile station performs zone transfer when the highest level of the peripheral zone level is higher than the own zone level by a connection permission level difference or more. Control method. Detecting means for detecting whether or not the own zone level exceeds the deterioration level, provided that the own zone level is equal to or lower than the permission level, when a voice incoming interrupt occurs during packet communication;
A control unit that suppresses a zone shift operation when the detection unit detects that the own zone level exceeds the deterioration level;
A mobile station comprising: The control means includes a counter that is incremented each time the detection means detects that the own zone level exceeds the deterioration level, and the zone shift of the mobile station is performed until the value of the counter reaches a predetermined value. 5. The mobile station according to claim 4, wherein the mobile station is not operated. 6. The mobile station according to claim 5, wherein the control means shifts the zone when the highest level of the peripheral zone level is higher than the own zone level by the connection permission level difference or more.

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