JP2006332896A - Mobile terminal, base station device, and radio communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal for using effectively a frequency channel which can be used in radio communication. <P>SOLUTION: The mobile terminal for performing radio communication with a base station device includes a channel performance storing means, in which a previously measured RF performance value is stored for each identifer of a frequency channel usable in radio communication, and a channel selection means for selecting frequency channel in superior order of the RF performance values which is stored in the channel performance storing means, when a using frequency channel needs to be selected during operation of radio communication. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile terminal, a base station apparatus, and a wireless communication system that efficiently use a frequency channel that can be used for wireless communication.

When a conventional base station is requested to assign a traffic channel from a mobile terminal, it considers the communication status with other mobile terminals, and assigns frequency channel candidates that can be assigned (not yet assigned to other mobile terminals). In general, an appropriate channel is allocated (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 06-326650

In the case of mobile terminals that support a large number of band classes and frequency channels, the expected performance values are satisfied due to the variations in the performance of the electronic components that make up the wireless communication circuit. However, the reception sensitivity and transmission for each frequency channel are satisfied. Performance values such as power efficiency and transmission / reception quality may vary.
However, since the conventional wireless communication system executes the wireless communication process without considering the variation in the performance value of the wireless communication circuit, there is a problem that the frequency channel that can be used efficiently cannot be selected. This problem has a problem in that it takes time to select a frequency channel, and performance varies between portable terminals.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a mobile terminal, a base station apparatus, and a wireless communication system that can preferentially use a frequency channel capable of exhibiting terminal performance. To do.

  The present invention is a portable terminal that performs wireless communication with a base station apparatus, and stores channel performance in which an RF performance value measured in advance is stored for each frequency channel identifier that can be used when performing the wireless communication. Storage means and channel selection means for selecting frequency channels in order of good RF performance values stored in the channel performance storage means when it is necessary to select a frequency channel to be used during the processing of the wireless communication It is characterized by comprising.

  The present invention provides a channel for notifying the base station apparatus of an RF performance value for each frequency channel identifier stored in the channel performance storage means when it is necessary to assign a frequency channel from the base station apparatus. A performance notification means is further provided.

  The present invention is a base station apparatus that performs wireless communication with a mobile terminal, the channel performance storage means for storing the RF performance value for each identifier of the frequency channel and the identifier of the mobile terminal in association with each other, and the mobile A channel performance receiving unit that receives an RF performance value for each frequency channel identifier from a terminal, associates the identifier of the mobile terminal with the received RF performance value for each frequency channel identifier, and stores the channel performance storing unit in the channel performance storage unit; Channel allocation means for searching for frequency channels that can be assigned in order of favorable RF performance values stored in the channel performance storage means when it is necessary to assign frequency channels to be used to the mobile terminal It is characterized by that.

  The present invention is a wireless communication system that performs wireless communication between a base station apparatus and a mobile terminal, and the mobile terminal performs RF measurement for each frequency channel identifier that can be used when performing the wireless communication. Channel performance storage means storing performance values, and when it is necessary to assign a frequency channel from the base station apparatus, RF performance values for each frequency channel identifier stored in the channel performance storage means are Channel performance notifying means for notifying a station apparatus, wherein the base station apparatus stores an RF performance value for each frequency channel identifier in association with an identifier of the mobile terminal, and the mobile terminal. The RF performance value for each frequency channel identifier is received from the mobile terminal, and the identifier of the mobile terminal is associated with the RF performance value for each received frequency channel identifier. When it is necessary to assign the channel performance receiving means to be stored in the channel performance storing means and the frequency channel to be used to the mobile terminal, the RF performance values stored in the channel performance storing means are in order of goodness. Channel assignment means for searching for an assignable frequency channel is provided.

  In the present invention, when it is necessary for the portable terminal to select a frequency channel to be used during the processing of the wireless communication, the frequency channels are selected in the order of good RF performance values stored in the channel performance storage means. It further comprises channel selection means for selecting.

  According to the present invention, it is possible to improve the use efficiency of the frequency channel by selecting the frequency channel to be used in the order of the good RF performance value of the frequency channel. Rate communication becomes possible, and the effect that wasteful power consumption can be prevented is obtained. In addition, since it is possible to efficiently allocate a frequency channel to be used between the base station apparatus and the mobile terminal, it is possible to improve the performance of the entire wireless communication system and to improve the performance of the mobile terminal. It can be pulled out to the maximum.

  Hereinafter, a mobile terminal and a base station apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 1 denotes a portable terminal for performing wireless communication. Reference numeral 3 denotes a base station (base station apparatus) for connecting the mobile terminal 1 to the mobile communication network 5 by establishing wireless communication with the mobile terminal 1. Reference numeral 11 denotes a wireless communication application execution unit that executes an application (GUI (Graphical User Interface), voice call, game, data communication, etc.) for performing wireless communication. Reference numeral 12 denotes a wireless communication protocol unit that performs processing based on a communication protocol for realizing wireless communication with the base station 3. Reference numeral 13 denotes a system determination unit that determines a band class / frequency channel of a wireless communication system to be captured when the power is turned on. Reference numeral 14 denotes a neighboring channel search unit that monitors band class / frequency channels used by neighboring base stations. Reference numeral 15 denotes an idle handoff unit that executes a handoff process during idling. Reference numeral 16 denotes a neighboring channel reporting unit that reports the monitoring result in the neighboring channel search unit 14 to the base station 3 during communication. Reference numeral 17 denotes a communicating handoff unit that executes a handoff process when communication is continued. Reference numeral 18 denotes a position registration unit that registers its own position in the mobile communication network 5. Reference numeral 19 denotes an outgoing / incoming processing unit that executes outgoing / incoming call processing. Reference numeral 20 denotes an RF performance notification unit that notifies the base station 3 of an RF (Radio Frequency) performance value for each band class and frequency channel that can be used by the mobile terminal 1.

  Reference numerals 21 and 22 are RF circuits having different performances, and include a first RF circuit corresponding to a wide range of ordinary band class / frequency channels and a second RF circuit dedicated to band class / frequency channels with improved performance. . Reference numeral 23 denotes an RF control unit that controls the operations of the two RF circuits 21 and 22. Reference numeral 24 denotes an RF circuit switching unit for switching between the first RF circuit 21 and the second RF circuit 22. Reference numeral 25 denotes a first RF control parameter storage unit in which the control parameters of the first RF circuit 21 are stored. Reference numeral 26 denotes a second RF control parameter storage unit in which the control parameters of the second RF circuit 22 are stored. The RF control is specially tuned to improve the RF performance of some band classes and frequency channels. Parameters are stored. Reference numeral 27 denotes an RF performance storage unit that stores the RF performance of each band class / frequency channel measured when the mobile terminal 1 is manufactured. The RF performance here is, for example, reception sensitivity, transmission power efficiency, transmission / reception quality, and the like.

  The RF performance notification unit 20 uses the information stored in the RF performance storage unit 2 at the time of system determination, neighbor channel search, neighbor channel report, handoff, location registration, outgoing call, incoming call, etc. The message is transmitted to the base station 3 as a message. Further, when the system determination unit 13 determines the band class / frequency channel of the wireless communication system to be captured first, the system determines the band class / frequency channel with a good RF performance value stored in the RF performance storage unit 27. Used for. When the neighboring channel search unit 14 monitors the neighboring channel, the neighboring channel search unit 14 preferentially uses a band class / frequency channel having a good RF performance value stored in the RF performance storage unit 27. The idle handoff unit 15 and the communicating handoff unit 17 preferentially use a band class / frequency channel having a good RF performance value stored in the RF performance storage unit 27 for handoff. When the neighboring channel reporting unit 16 reports the result of monitoring the neighboring channel during communication, the base station 3 reports the band class / frequency channel having a good RF performance value stored in the RF performance storage unit 27 with priority. .

  Reference numeral 30 denotes a wireless communication protocol unit that performs processing based on a communication protocol for realizing wireless communication with the mobile terminal 1. Reference numeral 31 denotes a communication channel allocation unit that searches for and allocates channels in order of favorable RF performance values in the mobile terminal 1 from channel candidates that can be allocated when a traffic channel allocation request is received from the mobile terminal 1. . Reference numeral 32 denotes a neighborhood in which when there are a plurality of handoff candidates for neighboring channel information reported from the mobile terminal 1, a channel is searched in order of favorable RF performance value in the mobile terminal 1 and a handoff instruction message to the channel is transmitted. A channel report receiving unit. Reference numeral 33 denotes an in-communication handoff unit that executes handoff processing when communication with the mobile terminal 1 is continued, and searches for channels in order of favorable RF performance values in the mobile terminal 1 and executes handoffs to other channels. .

Reference numeral 34 denotes a position registration unit that registers the position of the mobile terminal 1 in the mobile communication network 5. Reference numeral 35 denotes an outgoing / incoming processing unit for executing outgoing / incoming call processing. Reference numeral 36 denotes an RF performance notification receiving unit that stores the received RF performance value in the RF performance storage unit 40 in association with the identifiable identifier of the mobile terminal 1 when information on the RF performance value is received from each portable terminal 1. It is. Reference numeral 37 denotes an RF circuit on the base station 3 side. Reference numeral 38 denotes an RF control unit that controls the operation of the RF circuit 37. Reference numeral 39 denotes an RF control parameter storage unit in which control parameters for controlling the RF circuit 37 are stored. The RF control unit 38 controls the operation of the RF circuit 37 based on the control parameters stored in the RF control parameter storage unit 39.
Note that when the mobile terminal 1 does not notify the RF performance value, the wireless communication protocol unit 30 performs channel assignment and handoff processing on the assumption that all channels are normal performance channels.

Next, the table structure of the RF performance storage unit 27 shown in FIG. 1 will be described with reference to FIG. Based on the RF performance values (values such as reception sensitivity, transmission power efficiency, and transmission / reception quality) of each band class / frequency channel measured at the time of manufacturing the mobile terminal 1, the RF performance storage unit 27 For example, an identifier for identifying each band class and frequency is stored by classifying the channels into “best channel”, “good channel”, “low performance channel”, and “unusable channel”. Of the band class / frequency channels that can be used by the mobile terminal 1, channels that are not stored in the RF performance storage unit 27 are channels having normal performance.
The RF performance storage unit 27 has a configuration in which identifiers for identifying band classes and frequencies that can be used by the mobile terminal 1 are stored in the order of favorable RF performance values. The “best channel”, “good channel”, “low performance channel”, and “unusable channel” may be defined for each range.

Next, with reference to FIG. 2, the operation | movement which selects and acquires the band class and frequency channel to be used in the radio | wireless communication protocol part 12 of the portable terminal 1 is demonstrated. Here, an example will be described in which the system determination unit 13 selects and captures a band class / frequency channel to be used when performing system determination.
When the mobile terminal 1 is powered on, the system determination unit 13 refers to the RF performance storage unit 27 and selects from the band class / frequency channel candidates of the radio system (base station 3) to be captured first. Channels are selected in descending order of RF performance value (step S1). The system determination unit 13 determines whether there is a selection candidate and the channel has been selected (step S2). When the channel can be selected, the system determination unit 13 tries to acquire the selected band class / frequency channel (step S3). And the system determination part 13 determines whether it was able to be captured (step S4), and if it cannot be captured, it will return to step S1 and will select the next selection candidate. On the other hand, if the acquisition is successful, the system determination unit 13 executes a sequence when the system acquisition is successful (step S5). If there is no channel selection candidate and the channel selection candidate cannot be selected, the system determination unit 13 executes a sequence when the system acquisition fails (step S6).

  As described above, when the system determination process is executed, a channel having a good RF performance value among the channel selection candidates stored in the RF performance storage unit 27 is preferentially selected. It becomes possible to perform well. For example, when the neighboring channel is (band class 3 · 76ch), (band class 3 · 968ch), (band class 3 · 30ch), (band class 3 · 256ch), and the RF performance value is in the state shown in FIG. In the conventional mobile terminal, since there is no particular priority among the neighboring channels, (band class 3.76ch), (band class 3.968ch), (band class 3.30ch), (band class 3.256ch). ), (Band class 3, 76 ch), (Band class 3, 968 ch), (Band class 3, 30 ch), (Band class 3, 256 ch), (Band class 3, 76 ch), (Band class 3, 968 ch), (Band class 3.30ch), (band class 3.256ch), ... must be monitored in order No.

  However, in the portable terminal 1 of the present invention, the best channel is searched three times as often as the normal channel, the good channel is searched twice as usual, and the low performance channel is searched as half as normal. (Band class 3, 76ch), (Band class 3, 968ch), (Band class 3, 30ch), (Band class 3, 256ch), (Band class 3, 76ch), (Band class 3, 968ch), (Band (Class 3, 76 ch), (Band class 3, 76 ch), (Band class 3, 968 ch), (Band class 3, 30 ch), (Band class 3, 76 ch), (Band class 3, 76 ch), (Band class 3 (968ch), ... in this order, and frequency channel selection can be performed efficiently.

  The processing operation shown in FIG. 2 is not limited to the processing at the time of system determination, but can be applied when it is necessary to select a frequency channel to be used during wireless communication processing. For example, the portable terminal 1 periodically monitors neighboring channels based on information of neighboring channel notification messages from the base station 3 during idle or communication. During idle, when the reception quality of the neighboring channel is higher than the current channel by a certain amount or more, idle handoff is performed, and during communication, the base station 3 is periodically notified of changes in the reception quality of the current channel and neighboring channel. is doing. In such a case, when it is necessary to select a frequency channel to be used, if the frequency channel is selected in the order in which the RF performance value stored in the RF performance storage unit 27 is favorable, the RF performance value is further increased. Since it is possible to enter an idle state with a good frequency channel, it is possible to make stable incoming / outgoing calls even at an area boundary and to monitor in detail the changes in the frequency channel with a better RF performance value. The possibility of handoff to a good frequency channel is improved, and stable communication can be performed.

  In addition, the mobile terminal 1 holds specially tuned RF control parameters so as to improve the RF performance of some band classes and frequency channels, and responds to RF characteristics that change with temperature. Generally, a temperature correction parameter for performing correction according to the above is held. In general, as the number of RF control parameters is increased and the accuracy is increased, the RF performance is improved. However, since the RF control processing becomes complicated and adjustment takes time, RF control is performed for all band classes and frequency channels. Increasing the number of parameters or increasing accuracy is very difficult and impractical. However, the RF performance can be further improved only by preparing the RF control parameter only for the frequency channel having a good RF performance value, and the number of parameters to be stored can be reduced.

Next, with reference to FIG. 3, an operation of searching for a band class / frequency channel to be used in the wireless communication protocol unit 30 of the base station 3 will be described. Here, the communication channel assignment unit 31 will be described as an operation example in which a communication channel is assigned to the mobile terminal 1.
First, the RF performance notification receiving unit 36 gives information for identifying the mobile terminal 1 to the received information at the timing when the RF performance value information of each band class / frequency channel is received from the mobile terminal 1, and stores the RF performance storage. Store in the unit 40. On the other hand, when receiving a traffic channel allocation request from the mobile terminal 1, the communication channel allocation unit 31 obtains channel candidates that can be allocated to the mobile terminal 1 (step S11). Then, the communication channel assignment unit 31 determines whether there is an assignable channel candidate (step S12). As a result of this determination, if the allocation is possible, the communication channel allocation unit 31 refers to the RF performance storage unit 40, and among the available channel candidates, the RF performance value of the mobile terminal that has transmitted the traffic channel allocation request is The channels are searched in the favorable order (step S13) and searched until an assignable channel is found (step S14). And if the channel which can be allocated is found, the communication channel allocation part 31 will allocate this frequency channel with respect to the portable terminal 1 which transmitted the traffic channel allocation request | requirement, and will perform the sequence at the time of channel allocation success (step S15). On the other hand, if a search has been made for a frequency channel that can be allocated, the communication channel allocation unit 31 executes a sequence at the time of channel allocation failure (step S16).

The processing operation shown in FIG. 3 is not limited to the processing at the time of channel assignment at the start of communication, but can be applied when it is necessary to search for a frequency channel to be used during wireless communication processing. For example, when there are a plurality of handoff candidates for the neighboring channel information reported from the mobile terminal 1, a channel search is performed in the order of the mobile terminal 1RFF performance value being good, and a handoff instruction message including the found frequency channel is transmitted.
Note that when the mobile terminal 1 does not notify the RF performance value information, the wireless communication protocol unit 30 performs channel assignment and handoff on the assumption that all usable channels are normal performance channels.

  In this way, the mobile terminal 1 preferentially captures and searches for a band class / frequency channel having a good RF performance value, and selects a band class / frequency channel having a good RF performance value in advance before connecting the traffic channel. Since the base station 3 notifies the base station 3 and determines the frequency of the traffic channel to be assigned to each mobile terminal 1, the RF performance value of each mobile terminal 1 is preferentially assigned to a good frequency channel. It is possible to efficiently select a channel to be used. As a result, since communication is performed between the mobile terminal 1 and the base station 3 using a frequency channel having a good RF performance value, the communication is stable, high data rate communication is possible, and wasteful power is consumed. Can be avoided.

  The mobile terminal of the present invention includes a mobile phone using mobile communication, a personal digital assistant (PDA) having a mobile communication function, and the like.

  1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed to execute channel selection processing. In addition, channel assignment processing may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in the computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a block diagram which shows the structure of one Embodiment of this invention. It is a flowchart which shows operation | movement of the portable terminal 1 shown in FIG. It is a flowchart which shows operation | movement of the base station 3 shown in FIG. It is explanatory drawing which shows the table structure of the RF performance memory | storage part 27 shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Portable terminal, 20 ... RF performance notification part, 23 ... RF control part, 27 ... RF performance memory | storage part, 3 ... Base station, 36 ... RF performance notification receiving part, 40 ... RF performance memory

Claims (5)

A mobile terminal that performs wireless communication with a base station device,
Channel performance storage means in which an RF performance value measured in advance is stored for each frequency channel identifier that can be used when performing the wireless communication;
Channel selection means for selecting frequency channels in order of good RF performance value stored in the channel performance storage means when it is necessary to select a frequency channel to be used during the processing of the wireless communication. A portable terminal characterized by that.   Channel performance notification means for notifying the base station apparatus of an RF performance value for each frequency channel identifier stored in the channel performance storage means when it is necessary to have a frequency channel allocated from the base station apparatus. The mobile terminal according to claim 1, further comprising: A base station device that performs wireless communication with a mobile terminal,
Channel performance storage means for storing the RF performance value for each identifier of the frequency channel in association with the identifier of the mobile terminal;
Channel performance receiving means for receiving an RF performance value for each frequency channel identifier from the portable terminal, associating the identifier of the portable terminal with the received RF performance value for each frequency channel identifier, and storing it in the channel performance storage means; ,
Channel allocation means for searching for frequency channels that can be assigned in order of favorable RF performance values stored in the channel performance storage means when it is necessary to assign frequency channels to be used to the portable terminal. A base station apparatus characterized by that. A wireless communication system that performs wireless communication between a base station device and a mobile terminal,
The portable terminal is
Channel performance storage means in which an RF performance value measured in advance is stored for each frequency channel identifier that can be used when performing the wireless communication;
Channel performance notification means for notifying the base station apparatus of an RF performance value for each frequency channel identifier stored in the channel performance storage means when it is necessary to have a frequency channel allocated from the base station apparatus; Prepared,
The base station device
Channel performance storage means for storing the RF performance value for each identifier of the frequency channel in association with the identifier of the mobile terminal;
Channel performance receiving means for receiving an RF performance value for each frequency channel identifier from the portable terminal, associating the identifier of the portable terminal with the received RF performance value for each frequency channel identifier, and storing it in the channel performance storage means; ,
Channel allocation means for searching for frequency channels that can be assigned in order of good RF performance values stored in the channel performance storage means when it is necessary to assign frequency channels to be used to the portable terminal. A wireless communication system characterized by that. The portable terminal is
In the wireless communication process, when it is necessary to select a frequency channel to be used, the apparatus further comprises channel selection means for selecting frequency channels in order of good RF performance value stored in the channel performance storage means. The wireless communication system according to claim 4.

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