JP3839582B2 - Standby processing method in mobile communication system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile communication system, and more specifically to a standby processing method of a mobile communication system that can grasp free slot information of a base station that performs standby processing in a mobile communication terminal.
[0002]
[Prior art]
As a mobile communication system, PHS (Personal Handy Phone System), which was commercialized in May 1995, is a digital cordless phone that has been designed in consideration of sharing with homes, offices, and the public. It is highly expected as the driving force for multimedia including personalization and data transmission.
[0003]
PHS currently communicates at a transmission rate of 32 kbit / s using one time slot, but in the future, it can communicate at a transmission rate of 64 kbit / s using two time slots. As described above, PHS is capable of high-speed data transmission as compared with other mobile communication systems, so that it will acquire many users in the future as a communication means including not only voice calls but also multimedia transmissions. I think that the.
[0004]
[Problems to be solved by the invention]
On the other hand, when the PHS can perform communication at a transmission rate of 64 kbit / s using two time slots in this way, the PHS terminal and the base station can also enjoy the service of 64 kbit / s transmission. The specification must be compatible. Therefore, even a PHS terminal capable of transmitting 64 kbit / s cannot perform 64 kbit / s communication if the base station performing the standby process is a base station with a transmission rate of 32 kbit / s.
[0005]
Thus, even if the PHS terminal can support 64 kbit / s, there is no guarantee that data communication or the like can be performed at a transmission rate of 64 kbit / s unless the PHS terminal distinguishes the base station. On the other hand, since it is possible to distinguish whether the base station is compatible with 64 kbit / s communication by interpreting the content of a message (second system information notification) broadcast on the control channel, the second system information notification is transmitted to the base station. It is possible to preferentially select a 64 kbit / s communication compatible base station by referring to it at the time of selection.
[0006]
However, even if a standby process of a base station corresponding to 64 kbit / s is performed at the time of call connection, if the 64 kbit / s compatible base station has only one empty slot, the terminal side has 32 kbit / s. Only services with the same transmission rate as base stations with transmission rates can be enjoyed. Therefore, even if the base station supports 64 kbit / s communication, there is a problem that if there are not two or more empty slots in the communication channel, it becomes the same as that connected to the base station of 32 kbit / s.
[0007]
The present invention solves such problems and enables the mobile communication terminal to check the number of empty slots in the base station, thereby quickly connecting to a base station having more empty slots than the user desires. An object of the present invention is to provide a standby processing method in a mobile communication system.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides a mobile station that communicates through a base station by performing a standby process with a base station and an incoming call message in which a terminal number that performs a call transmitted from the base station is set. In a standby processing method in a mobile communication system having a mobile communication terminal, the base station includes information on the number of available slots that can be provided in an incoming call message in which a terminal number for calling is set, and Send. The mobile communication terminal receives an incoming call message in which a terminal number for calling a base station in standby processing is set , and information on the number of available empty slots included in the incoming call message is the desired number of available slots If it is not satisfied, the terminal number for calling the base station that is in the standby process that is searched by excluding this base station from the base station that performs the standby process is set. The incoming call message is received and the same processing is performed.
[0009]
In addition, according to the present invention, a standby processing method for a mobile communication terminal that performs communication via a base station by performing standby processing using an incoming call message in which a terminal number that performs a call transmitted from the base station is set. , Receiving an incoming call message in which a terminal number for calling a base station that is in standby processing is set , and information on the number of available empty slots included in the incoming call message satisfies the desired number of available slots. and whether the a judgment as, if not satisfied make calls base station in the newly standby processing looked excluded from the base station to perform standby processing and stores the identification information of the base station The incoming call message in which the terminal number is set is received and the same processing is performed.
[0010]
Further, according to the present invention, in a base station that can be connected to a plurality of mobile communication terminals, the base station includes information on the number of available slots that can be provided in an incoming call message in which a terminal number for calling is set. To the mobile communication terminal.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a standby processing method in a mobile communication system according to the present invention will be described in detail with reference to the accompanying drawings.
Referring to FIG. 2, there is shown a functional block diagram showing an embodiment when the mobile communication terminal according to the present invention is applied to a PHS terminal. The PHS terminal 10 according to the present embodiment is a TDMA mobile communication terminal capable of performing 64 kbit / s bearer transmission using two time slots. The applicant of the present application has already filed Japanese Patent Application No. 8-316453 as a related technology of a PHS terminal capable of controlling two time slots.
[0012]
In FIG. 2, an antenna 12 receives radio waves transmitted from a base station and outputs them to radio units 14a and 14b, and radiates signals input from these radio units 14a and 14b into space. Each of the radio units 14a and 14b is a radio unit that processes a signal of one slot with a transmission rate of 32 kbit / s. That is, these radio units 14 amplify and frequency-convert the signal for one slot received from the antenna 12 and output the signal to the speech path control unit 16, and the voice modulation signal for one slot from the speech path control unit 16. Amplified and frequency-converted and output to the antenna 12.
[0013]
The communication path control unit 16 has functions such as switching control of a communication path of two 32 kbit / s time slots, channel codec, voice processing, modulation / demodulation, and the like.
[0014]
Specifically, the speech path control unit 16 demodulates and decodes the signal input from the radio unit 14 using the time slot according to the control of the call control unit 18, and outputs the signal to the speaker 20 after amplification. Similarly, the signal input from the microphone 22 is amplified, encoded, modulated, and output to the radio unit 14.
[0015]
The call control unit 18 is a control unit that controls the entire PHS terminal 10 including protocol processing. The call control unit 18 includes a memory such as a ROM and a RAM therein, and operates according to a call processing program stored in the ROM. That is, when the LCD display unit 24 and the key operation unit 26 are connected and the call control unit 18 receives an incoming call request from the base station via the radio unit 14, the call control unit 18 receives a ring tone from the speaker 20 via the speech path control unit 16. And an incoming call display on the LCD display unit 24.
[0016]
When a response operation by the key operation unit 26 is detected, the speech path control unit 16 is controlled to set the speech path. When a telephone number is input from the key operation unit 26 and a calling operation is performed, the input telephone number or the like is displayed on the LCD 24, and the base station that performs the standby processing by controlling the wireless unit 14 is displayed. A call request is made to the terminal. Thus, when the called party terminal responds, the radio channel 14 and the communication path control unit 16 are controlled to set the communication path.
[0017]
In addition, the call control unit 18 receives a control channel from the neighboring base station via the radio unit 14, and selects a base station that performs standby processing. That is, in the present embodiment, the call control unit 18 is connected to the base station ID storage memory 28, and stores in this memory 28 peripheral base stations capable of 64 kbit / s bearer transmission that are excluded as base stations that perform standby processing.
[0018]
Specifically, the call control unit 18 monitors the control channel during standby, refers to the incoming call message of the control channel signal transmitted from the base station, and is included in the information element in the current message. Check the available slot information that the base station can provide. FIG. 3 is a message format showing an example of the content of an incoming call message transmitted from the base station to the PHS terminal.
[0019]
As shown in FIG. 3, in the incoming call message, the call service type is indicated in the 5th to 7th bits of 1 octet, and the telephone number of the PHS terminal (1 to 7 octets other than that) is called. 13 digits) is set. For this reason, when the call service type from the 5th bit to the 7th bit of the 1 octet is “000” and “no call”, the other data from 1 octet to 7 octets becomes unnecessary. In this embodiment, the base station sets empty slot information in an area where the telephone number (13 digits) of the PHS terminal is set when “no call”.
[0020]
Returning to FIG. 2, the LCD display unit 24 is a display unit that performs various displays such as a telephone number, a message, or a received electric field level of the base station. The key operation unit 26 performs some action on the call control unit 18 such as a power key, an input key for inputting a telephone number or characters of a called party terminal, or a call connection key for performing call processing or response processing. It consists of various keys.
[0021]
FIG. 1 shows an example of a processing flow showing an embodiment of a standby processing method in a mobile communication system according to the present invention. The operation of this embodiment will be described with reference to FIGS. In FIG. 1, the PHS terminal 10 first performs standby processing for the base station 1 and receives the control channel signal 100 from the base station 1 in the battery saving cycle.
[0022]
When receiving the control channel signal 100 from the base station 1, the call control unit 18 of the PHS terminal 10 confirms the content of the call service type in the incoming call message shown in FIG. When the content is “000”, the call control unit 18 determines that there is no call and can provide the base station 1 set to PS number (first number) to PS number (13th number). Check free slot information. In this case, since the number of empty slots is “1” or “0”, the call control unit 18 determines that the number of empty slots sufficient to provide the service cannot be secured, and determines the number of empty slots “not empty”. Perform (102). Then, the call control unit 18 stores the identification information of the base station 1 in the base station ID storage memory 28 (104), and excludes it from the base station candidates that perform the standby process.
[0023]
Next, in order to search for a new base station that performs standby processing, the call control unit 18 executes monitoring processing of the control channels of the neighboring base stations (106). Then, the call control unit 18 selects the base station 2 having the highest received electric field level as a new base station that performs standby processing from among them, and performs control channel establishment processing with the base station 2 (108).
[0024]
Thereafter, the call control unit 18 receives the control channel signal 110 from the base station 2 and confirms the free slot information that can be provided by the base station 2 as in the case of the base station 1.
[0025]
As a result, if the base station 2 can provide the number of empty slots required by the PHS terminal 10, the number of empty slots for “available” is determined (112). I do. That is, the call control unit 18 receives the control channel signal 110 from the base station 2 in the battery saving cycle, and similarly determines the number of empty slots (112). The call control unit 18 receives the control channel signal 110 to determine the number of empty slots, and the base station that performs the standby process when the received electric field level of the base station 2 becomes a predetermined value or less Repeat even when replacing the base station.
[0026]
If there is no base station that can provide the number of empty slots required by the PHS terminal 10 among the neighboring base stations, the call control unit 18 determines that the base station with the highest received electric field level has the number of empty slots. A standby process is performed on the system. For example, instead of performing data transmission and voice communication at 64 kbit / s, data transmission and voice communication are performed at a speed of 32 kbit / s. In such a case, the call control unit 18 may display on the LCD display unit that the 64 kbit / s service cannot be provided and notify the user.
[0027]
As described above in detail, according to the present embodiment, the base station transmits the number of currently available communication slots to the mobile communication terminal in the standby state using the control channel. Further, the PHS terminal confirms the number of empty slots received through the control channel from the standby base station. When the PHS terminal confirms that the desired number of empty slots cannot be supplied from the base station that is performing the standby processing, the PHS terminal promptly re-waits for another base station, thereby quickly The standby process can be shifted to a base station that can provide the number.
[0028]
In the present embodiment, the present invention is applied to a 64 kbit / s-compatible PHS communication system. However, the present invention is not particularly limited to such a communication system. For example, two or more TDMA slots can be used. Any communication system that can use a mobile communication terminal is applicable. In the future, various services are expected to be provided in the mobile communication system. Among them, a service using a plurality of time slots is naturally conceivable as in this embodiment. If the present invention is applied to a communication system capable of providing such a service, for example, the line is released and the service cannot be provided to the user because the number of empty slots is insufficient after connecting to the base station. In addition, it is possible to prevent a connection delay from occurring due to reconnection to another base station.
[0029]
【The invention's effect】
As described above, according to the standby processing method in the mobile communication system of the present invention, even when the mobile communication terminal provides a user with a service using a plurality of time slots, the service cannot be provided for the first time after the base station is connected. Therefore, the user can enjoy the service stably.
[Brief description of the drawings]
FIG. 1 is a processing flow showing an embodiment of a standby processing method in a mobile communication system according to the present invention.
FIG. 2 is a functional block diagram showing an embodiment when a mobile communication terminal according to the present invention is applied to a PHS terminal.
FIG. 3 is a message format showing the contents of an incoming call message transmitted from a base station to a PHS terminal.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 PHS terminal 12 Antenna 14a, 14b Radio | wireless part 16 Call path control part 18 Call control part 20 Speaker 22 Microphone 24 LCD display part 26 Key operation part 28 Base station ID storage memory

Claims (6)

Mobile communication comprising a base station and a mobile communication terminal that performs communication through the base station by performing a standby process with an incoming call message in which a terminal number for performing a call transmitted from the base station is set In the standby processing method in the system,
The base station includes information on the number of available slots that can be provided in an incoming call message in which a terminal number that performs the call is set and transmits the information to the mobile communication terminal,
The mobile communication terminal receives an incoming call message in which a terminal number for calling the base station in standby processing is set, and information on the number of available free slots included in the incoming call message is a desired free Judge whether the number of slots is satisfied, and if not satisfied, this base station is excluded from the base station that performs the standby process and is searched for the terminal number that calls the base station that is in the standby process. A standby processing method in a mobile communication system, wherein the same processing is performed by receiving an incoming call message in which is set. 2. The standby processing method according to claim 1, wherein the information on the number of available slots that can be provided is included in an incoming call message in which a terminal number for performing the call transmitted to the mobile communication terminal is set in a battery saving cycle. A standby processing method in a mobile communication system. In the standby processing method of the mobile communication terminal that performs communication via the base station by performing standby processing with an incoming call message in which a terminal number that performs a call transmitted from the base station is set,
The incoming call message in which the terminal number for calling the base station that is in the standby process is set is received, and the information on the number of available empty slots included in the incoming call message satisfies the desired empty slot number. If it is not satisfied, if it is not satisfied, the base station that stores the identification information of this base station and excludes it from the base station that performs the standby process and searches for the base station that is currently in the standby process is called A standby processing system for a mobile communication terminal, wherein an incoming call message in which a number is set is received and the same processing is performed.   4. The standby processing method according to claim 3, wherein the mobile terminal is provided with information on the number of empty slots that can be provided by the base station by an incoming call message in which a terminal number for performing the call received in a battery saving cycle is set. The mobile communication terminal standby processing method characterized by receiving   4. The standby processing system according to claim 3, wherein when the mobile communication terminal does not find a base station that satisfies a desired number of empty slots, the mobile communication terminal selects a base station having an empty slot and performs standby processing. A standby processing method for a mobile communication terminal, which performs a service according to the number of empty slots of the selected base station. Setting a plurality of mobile communication terminals connectable base stations, if without the base station calls, the vacant slot number information which can be provided, in a region where the terminal number for a call incoming call message is set And transmitting to the mobile communication terminal.

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