JP4117963B2 - Mobile terminal with communication procedure switching function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile terminal capable of performing high-speed data communication using a plurality of radio slots in a radio communication system including a base station and a mobile terminal.
[0002]
[Prior art]
A conventional mobile terminal will be described with reference to FIGS.
[0003]
1 to 4 show sequence diagrams when performing high-speed data communication using two or more radio slots using PHS. Among these, FIG. 1 and FIG. 3 are sequence diagrams regarding a call control procedure in the case of a fixed slot type using the maximum number of radio slots that a mobile terminal always requests. 2 and 4 are sequence diagrams relating to a call control procedure in the case of a variable slot type that can switch the number of radio slots used by a mobile terminal in a flexible manner.
[0004]
Based on FIG. 1, when a data communication using a plurality of radio slots is requested from a fixed slot type mobile terminal to the public base station, the establishment of the second and subsequent radio channels is rejected by the public base station. A call control procedure in this case will be described.
[0005]
When the user terminal is instructed to perform data communication using a plurality of radio slots, the mobile terminal requests link setting by transmitting an LCH establishment request message (101) to the public base station.
[0006]
The public base station that has received the LCH establishment request message (101) acquires the first radio slot, and sets the radio slot number in the LCH assignment message (102), so that the radio terminal is notified of the radio slot. Make an assignment.
[0007]
Thereafter, synchronization of the radio channel between the mobile terminal and the public base station is established by transmission of the uplink synchronization burst from the mobile terminal (103) and transmission of the downlink synchronization burst from the public base station (104).
[0008]
After the synchronization is established, a layer 2 link is established by SABM (105) transmission from the mobile terminal and UA (106) transmission from the base station. When the mobile terminal is instructed by the user to perform data communication using a plurality of radio slots, the mobile terminal establishes a second and subsequent radio channels using the radio channel established at this time, and adds a TCH addition request message (107 ) To the public base station.
[0009]
The public base station that has received the TCH addition request message (107) starts the acquisition operation of the second radio slot, but if the acquisition fails because it is all used by other mobile terminals (108) , TCH addition rejection message (109) is transmitted.
[0010]
At this time, the slot-fixed type mobile terminal does not continue the communication with only one slot but transmits DISC (110) to start voluntary release of the layer 2 link and shifts to the disconnection recovery process.
[0011]
The public base station that has received the DISC (110) from the mobile terminal transmits the UA (111) to complete the release of the layer 2 link, and then transmits the radio channel disconnect message (112) to release the radio channel. To start.
[0012]
Thereafter, the public base station releases the acquired radio slot by a radio channel disconnection completion message (113) from the mobile terminal, and completes the disconnection recovery for the call.
[0013]
Next, when requesting data communication using a plurality of radio slots from the slot variable type mobile terminal to the public base station based on FIG. A call control procedure when rejected will be described.
[0014]
After the mobile terminal transmits the LCH establishment request message (201) to the public base station, the mobile terminal receives a TCH addition rejection message (209) indicating the acquisition failure of the second radio slot from the public base station. The sequence is the same as when communicating with a slot-fixed type mobile terminal.
[0015]
In the mobile terminal, when the user of the mobile terminal selects the slot variable type and receives the TCH addition rejection message (209), the call connection procedure (210 to 212) is performed in order to continue communication in only one slot. ) Is continued, the state shifts to the state of communication (213), and communication is performed at a speed (using one slot) slower than the communication speed requested first.
[0016]
Next, when data communication using a plurality of slots is performed between the fixed slot type mobile terminal and the public base station, the second and subsequent slots are released from the public base station using FIG. A call control procedure when instructed to do so will be described.
[0017]
The case where the public base station instructs the mobile terminal to release the second and subsequent slots means that the public base station corresponding to the wireless communication system disclosed in Japanese Patent Laid-Open No. 10-262277 has a plurality of mobile terminals. When data communication using the wireless slot is performed, communication using the wireless slot is requested from another mobile terminal that desires to communicate with the public base station, and there is no free wireless slot to be allocated. Fig. 5 shows a case where a public base station instructs a call using a plurality of radio slots to forcibly release a part of the radio slots. In this case, the public base station transmits a radio channel disconnect message to the mobile terminal.
[0018]
Sequence from the time when the mobile terminal transmits an LCH establishment request message (301) to the public base station until the mobile terminal receives a TCH addition request message (304) requesting acquisition of the second radio slot from the mobile terminal Is similar to the operation when the establishment of the second and subsequent radio slots shown in FIGS. 1 and 2 is rejected.
[0019]
The public base station that has received the TCH addition request message (304) from the mobile terminal acquires the second radio slot and sets the radio slot information in the TCH addition assignment message (305), thereby allowing the mobile terminal to The wireless slot information acquired is notified.
[0020]
After notification of the second radio slot, radio channel synchronization is established between the mobile terminal and the public base station (306), and the communication is in progress (311 and 312) after the call connection procedure (307 to 310). The communication is performed at the speed requested by the mobile terminal.
[0021]
When the mobile terminal receives a radio channel disconnection message (313) instructing to release the second and subsequent radio slots from the public base station while in communication (311 and 312), the mobile terminal After transmitting the wireless channel disconnection completion message (314) to the wireless channel, the user of the mobile terminal has selected the fixed slot type, so that the first wireless channel is not continued with only one slot. Also, by sending a disconnect message (315), call disconnection recovery is started voluntarily, and the process proceeds to disconnection recovery processing. Thereafter, both the mobile terminal and the public base station transition to a free state through a call disconnection recovery procedure (316 to 321).
[0022]
Next, based on FIG. 4, when data communication using a plurality of slots is performed between the slot variable type mobile terminal and the public base station, the second and subsequent slots are released from the public base station. A call control procedure when instructed to do so will be described.
After the mobile terminal transmits the LCH establishment request message (401) to the public base station, the first wireless channel and the second wireless channel are in communication (402 to 412). The sequence is the same as when communicating with a slot-fixed type mobile terminal.
[0023]
When the mobile terminal receives a radio channel disconnection message (413) instructing to release the second and subsequent radio channels from the public base station while in communication (411 and 412), the mobile terminal After transmitting the wireless channel disconnection completion message (414) to the wireless channel, the user of the mobile terminal has selected the slot variable type, so the communication is continued with only one slot without shifting to the disconnection recovery operation.
[0024]
As described above, when performing data communication using a plurality of radio slots, a conventional mobile terminal includes a mobile terminal that performs a fixed slot type operation and a mobile terminal that performs a slot variable type operation. .
[0025]
[Problems to be solved by the invention]
However, in a conventional mobile terminal, when trying to communicate using a plurality of radio slots, the slot fixed type or the slot variable type is determined as one according to the service provided by each carrier. .
[0026]
When a user of a mobile terminal requests communication using a plurality of radio slots using a mobile terminal compatible with a fixed slot type system, once the communication is established, the number of requested requests remains as long as communication is continued. Since the use of radio slots is guaranteed, a communication speed proportional to the number of radio slots to be used is guaranteed. However, when making or receiving calls in areas with high traffic, or when handing over to other public base stations, the required number of radio slots is not always available. There is a high possibility that the establishment fails and communication is not possible.
[0027]
On the other hand, when a user of a mobile terminal requests communication using a plurality of radio slots using a mobile terminal corresponding to a variable slot type system, one slot can be secured even if the requested number of radio slots is not available. Since the call is connected, the success probability of the outgoing or incoming call is increased. However, the number of radio slots to be used may be limited regardless of the user's will.
[0028]
Thus, a mobile terminal that supports only one of the methods has a problem that the user of the mobile terminal cannot select a communication procedure according to the purpose of use.
[0029]
The present invention has been made in view of the above problems, and when a user of a mobile terminal requests to perform data communication using a plurality of radio slots, the communication procedure is selected according to the purpose of the communication. It aims at providing the function to switch automatically.
[0030]
[Means for Solving the Problems]
According to the present invention, in the mobile terminal capable of performing data communication with a public base station using a plurality of radio slots, the maximum number of requests is always required while communication is continued. The number of radio slots to be used based on the fixed slot type communication procedure guaranteed to use radio slots and the traffic of the public base station and the communication quality of the radio slots in use while communication is continued. And a switching means for selectively switching between the slot-variable type communication procedures capable of switching between.
[0031]
A second aspect is characterized in that, in the first aspect, the switching means performs switching based on information set in advance by a user.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a mobile terminal with a communication procedure switching function according to the present invention will be described below with reference to the drawings.
[0033]
FIG. 5 is a sequence diagram when establishment of the second and subsequent radio channels is rejected in the mobile terminal of the present invention. FIG. 6 is a sequence diagram in the case where the mobile terminal of the present invention is instructed to release the second and subsequent slots from the public base station. FIG. 7 is a flowchart when the user of the mobile terminal sets whether to perform a fixed slot type operation or a variable slot type operation when performing data communication using a plurality of radio slots.
[0034]
Based on FIG. 5, when a mobile terminal requests data communication using a plurality of radio slots, if acquisition of the second and subsequent radio channels is rejected by the public base station, the slot fixed type operation is performed. An embodiment relating to processing for determining whether or not to perform a variable slot type operation and determining the subsequent operation will be described.
[0035]
After the mobile terminal transmits the LCH establishment request message (501) to the public base station, the mobile terminal receives the TCH addition rejection message (509) indicating the acquisition failure of the second radio slot from the public base station. The sequence is the same as the sequence (refer to 101 to 109 in FIG. 1 and 201 to 209 in FIG. 2) in the case where communication is performed with a conventional mobile terminal.
[0036]
The mobile terminal that has received the TCH addition rejection message (509) determines whether the current condition setting stored in a storage unit such as a memory of the mobile terminal described later is a slot fixed type or a slot variable type. (510).
[0037]
When the determination result is the slot fixed type, the mobile terminal is the same as the disconnection restoration procedure performed after the slot fixed type mobile terminal shown in FIG. 1 among the conventional mobile terminals receives the TCH addition rejection message (109). (110 to 113). Further, when the determination result is the variable slot type, the mobile terminal performs a call connection procedure performed after the slot variable type mobile terminal shown in FIG. 2 among the conventional mobile terminals receives the TCH addition rejection message (209). The same operation is performed (210 to 214).
[0038]
Next, referring to FIG. 6, when data communication using a plurality of radio slots is performed between the mobile terminal and the public base station, the mobile terminal releases the second and subsequent slots from the public base station. When instructed, an embodiment relating to a process of determining whether to perform a fixed slot type operation or a variable slot type operation and determining the subsequent operation will be described.
[0039]
After the mobile terminal transmits the LCH establishment request message (601) to the public base station, the first wireless channel and the second wireless channel are in communication (602 to 612). The sequence is the same as the sequence (see 301 to 312 in FIG. 3 and 401 to 412 in FIG. 4) when communication is performed with the mobile terminal of the conventional example.
[0040]
When the mobile terminal receives a radio channel disconnection message (613) instructing to release the second and subsequent radio slots from the public base station while in communication (611 and 612), the mobile terminal After transmitting a radio channel disconnection completion message (614) to the radio channel, the current condition setting stored in a storage unit such as a memory of a mobile terminal described later is a slot fixed type or a slot variable type Is determined (615).
[0041]
If the determination result is a slot fixed type, the mobile terminal is a disconnection restoration procedure performed after the slot fixed type mobile terminal shown in FIG. 3 transmits a radio channel disconnection completion message (314) among the conventional mobile terminals. The same operation is performed (315 to 321). Further, when the determination result is the slot variable type, the mobile terminal is the same as the case where the slot variable type mobile terminal shown in FIG. 4 among the conventional mobile terminals transmits the radio channel disconnection completion message (414). Communication is continued in only one slot (415).
[0042]
Next, the form of an embodiment when the user of the mobile terminal sets the condition of the mobile terminal will be described with reference to FIG.
[0043]
In FIG. 7, the user of the mobile terminal performs a slot-fixed operation when performing data communication using a plurality of radio slots by means of a function key, a dial button, or the like of the mobile terminal. After transitioning to a state in which the condition setting for performing the variable slot type operation can be performed, a condition indicating the fixed slot type or the variable slot type is input (S1). It is determined whether or not the condition input by the user of the mobile terminal matches the current condition stored in the storage unit such as the memory of the mobile terminal (S2), and is stored in the storage unit of the mobile terminal only when it does not match. The conditions being rewritten are rewritten (S3).
[0044]
In addition, in the embodiment shown above, the part where the user of the mobile terminal changes the setting condition by the user's operation on the mobile terminal is mounted on the information terminal such as a personal computer connected to the mobile terminal. It can also be performed from application software, and is not limited to that shown in the present embodiment.
[0045]
【The invention's effect】
With the present invention, when a user requests to perform data communication using a plurality of radio slots, the slot fixed type is always used when performing meaningless communication unless the maximum speed is always guaranteed. Even if the maximum speed is not guaranteed, the possibility of call establishment is high, and when stable communication is required, the slot variable type can be selected for each call according to the purpose of the communication. It becomes possible to selectively switch the communication procedure.
[0046]
In the system using the mobile terminal of the present invention, it is possible to set a charge for each communication procedure in proportion to the guaranteed bandwidth.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a conventional slot-fixed type sequence.
FIG. 2 is a diagram showing an example of a conventional slot variable type sequence.
FIG. 3 is a diagram showing an example of a conventional fixed slot type sequence.
FIG. 4 is a diagram showing an example of a conventional slot variable type sequence.
FIG. 5 is a diagram showing an example of a slot fixed type / variable type switching sequence according to the present invention.
FIG. 6 is a diagram showing an example of a slot fixed type / variable type switching sequence according to the present invention.
FIG. 7 is a flowchart showing an example of a procedure for changing the setting of the slot fixed type / slot variable type of the present invention.
[Explanation of symbols]
501, 601 LCH establishment request 502, 602 LCH allocation 507, 604 TCH addition request 509 TCH addition rejection 613 Radio channel disconnection

Claims (2)

In a mobile terminal capable of performing data communication with a public base station using a plurality of radio slots,
A fixed-slot communication procedure that is guaranteed to always use the maximum number of radio slots required while communication continues;
A variable slot type communication procedure capable of switching the number of radio slots to be used based on the traffic of the public base station and the communication quality of the radio slot being used while communication is continued;
A mobile terminal with a communication procedure switching function, comprising switching means for selectively switching between. In claim 1,
The mobile terminal with a communication procedure switching function, wherein the switching means performs switching based on information set in advance by a user.

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