JP2010283866A - Radio communication equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile unit which determines priorities of control channels to be initiated while taking into account an initiation success rate of a speech channel when the mobile unit is to create a control channel initiation table by measuring levels (RSSI) of control channels. <P>SOLUTION: Radio communication equipment, which performs radio communication with a base station on a selected channel, includes: a monitoring means for monitoring a plurality of predetermined control channels; a priority determining means for determining priorities to select control channels based on a result of monitoring conducted by the monitoring means; and a channel selecting means for selecting the control channel to be used for the radio communication equipment based on the priorities determined by the priority determining means. When the initiation of a communication channel is made successful from a certain control channel among the control channels, the priority determining means changes the priority of the control channel corresponding to the successfully initiated communication channel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wireless communication terminal, and more particularly to a mobile communication terminal that selects a channel suitable for communication from a plurality of channels.

  A wireless communication terminal (mobile device) such as a portable wireless device sets up a communication line using radio waves with a base station, and communicates by transmitting and receiving voice, data, and the like wirelessly. In particular, in a mobile device that performs data communication using packets, voice communication is performed using a call channel (TCH), and packet communication is performed using a user packet channel (UPCH). The communication channels (TCH, UPCH) used for these communications are activated from the control channel (CCH), and the control channels of neighboring cells are broadcast from the base station to the mobile station via the broadcast channel (BCCH).

  When power is turned on, the mobile device sequentially receives (scans) preset control channels, measures the received signal strength (RSSI) in the control channels, and selects a receivable control channel. Then, information necessary for radio control is obtained by a broadcast information message sent through the activated control channel. Further, when the mobile device next activates the control channel, it scans the preset control channel again and selects the control channel to be activated.

  In addition, the mobile device measures the received signal strength (RSSI) of the control channel of the neighboring cell based on the information of the control channel (perch channel) of the neighboring cell broadcast on the broadcast channel. Then, the mobile station creates a peripheral level measurement table in which the control channels are arranged in the order of the received signal strength based on the measurement result of the reception signal level of the control channel of the peripheral cell, and reports the level measurement result to the base station. is doing.

  When a call channel (TCH) is activated to start voice communication, a call channel corresponding to the control channel of the own zone is activated, and communication is performed by shifting to the call channel. Further, when starting a user packet channel (UPCH) to start packet communication, the mobile device starts a user packet channel corresponding to the control channel and performs packet communication.

  However, when this control channel is activated, it is ranked according to the received signal strength of the predetermined control channel, and a control channel with a strong received signal strength is selected and activated, but there are multiple control channels with the same received signal strength. Any control channel can then be activated. In this case, communication is established when a call channel corresponding to this control channel is activated from a certain control channel, but when a call channel corresponding to this control channel is activated from another control channel, noise, interference, etc. The communication channel may not start due to poor communication quality. That is, in such a case, there is a problem that the success rate of starting the communication channel (probability of establishment of communication) decreases due to selection of the control channel.

  According to the present invention, when a mobile station measures a control channel level (RSSI) and creates a control channel activation table, the priority of the control channel to be activated is determined in consideration of the activation success rate of the call channel. The purpose is to provide a mobile device.

  According to a first aspect of the present invention, in a wireless communication device that performs wireless communication with a base station using a selected channel, a monitoring unit that monitors a plurality of predetermined control channels, and a monitoring result by the monitoring unit A priority determining means for determining a priority for selecting a control channel; and a channel selecting means for selecting a control channel used by the wireless communication device based on the priority determined by the priority determining means, The priority determination means changes the priority of the control channel corresponding to the communication channel that has been successfully activated when the communication channel is successfully activated from a certain control channel among the control channels. .

  In a second aspect based on the first aspect, the priority determining means includes monitoring result changing means for changing a monitoring result of a control channel related to the channel for which the communication has been established, and the monitoring result changing means By changing the monitoring result for the channel, the priority for the channel is changed.

  In a third aspect based on the first aspect, the priority determining means includes priority changing means for changing the priority of the control channel related to the channel for which the communication has been established to a higher order, and the priority changing means The priority regarding the channel is changed by changing the rank regarding the channel to the higher rank.

  According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the wireless communication includes a communication unit that performs communication according to a first procedure and communication according to a second procedure. The control channel priority is set separately for the communication according to the above procedure and the communication according to the second procedure.

  According to a fifth invention, in the fourth invention, the communication means changes from the communication according to the first procedure to the communication according to the second procedure, or from the communication according to the second procedure to the first procedure. When changing to communication, if the wireless communication device has not acquired information on the control channel used in the communication procedure of the change destination, the priority change of the control channel is canceled and the control used in the communication procedure of the change destination If the wireless communication device can acquire information on the channel, the priority of the control channel used in the communication procedure after the change is changed based on the acquired information.

  In a sixth aspect based on the fifth aspect, the communication according to the first procedure is voice communication, and the communication according to the second procedure is packet communication.

  In a seventh aspect based on the first to sixth aspects, the priority determination means cancels the change of the priority of the control channel when changing the control channel used for standby during standby. It is characterized by that.

  In an eighth aspect based on the first to seventh aspects, the priority determining means acquires information on the communication channel to be changed when the communication channel is changed during communication. If the wireless communication device can acquire the information about the communication channel of the change destination when the priority change of the control channel is canceled when it is not, the control channel of the change destination is changed based on the acquired information. The priority is changed.

In the first invention, in a wireless communication device that performs wireless communication with a base station using a selected channel, based on a monitoring unit that monitors a plurality of predetermined control channels, and a monitoring result by the monitoring unit, Priority determination means comprising: priority determination means for determining priority for selecting a control channel; and channel selection means for selecting a control channel used by the wireless communication device based on the priority determined by the priority determination means. When the communication channel is successfully activated from a certain control channel among the control channels, the means changes the priority of the control channel corresponding to the communication channel that has been successfully activated. Since the connection is preferentially performed, the channel activation success rate can be improved.

  In the second invention, the priority determination means has monitoring result change means for changing the monitoring result of the control channel related to the channel for which communication has been established, and the monitoring result changing means changes the monitoring result related to the channel, Since the priority related to the channel is changed, out of the channels that have a good monitoring result and a high probability of being activated, the priority of the channel once established is positioned higher and the channel once established is established. As a result, the channel can be preferentially connected, and the channel activation success rate can be improved.

  In the third invention, the priority determining means has priority order changing means for changing the priority of the control channel related to the channel for which communication has been established to a higher order, and the priority order changing means changes the order related to the channel to the higher order. As a result, the priority related to the channel is changed, and therefore, among the channels with a good monitoring result and a high probability of being activated, the priority of the channel once established is surely placed higher, and the communication is performed once. The established channel can be preferentially connected, and the channel activation success rate can be improved.

  According to a fourth aspect of the present invention, a communication means for performing communication according to the first procedure and communication according to the second procedure as wireless communication is provided, and the priority determining means is based on the communication according to the first procedure and the second procedure. Since the priority of the control channel is set separately for communication, a channel suitable for activation can be selected for each communication procedure.

  In the fifth invention, when the communication means changes from communication according to the first procedure to communication according to the second procedure, or from communication according to the second procedure to communication according to the first procedure, the change destination communication If the wireless communication device does not acquire information on the control channel used in the procedure, the priority change of the control channel is canceled, and if the wireless communication device can acquire information on the control channel used in the communication procedure of the change destination Since the priority of the control channel used in the communication procedure after the change is changed based on the acquired information, a channel suitable for activation can be selected even after the communication procedure is changed.

  In the sixth aspect of the invention, the communication according to the first procedure is voice communication, and the communication according to the second procedure is packet communication, so that it is not affected by the channel priority in the zone where the packet communication is provided. Both the channel relating to the call and the channel relating to the packet communication can be activated appropriately.

  In the seventh invention, the priority determination means cancels the change of the priority of the control channel when changing the control channel used for standby during standby, so that the channel related error is detected when the zone shifts. Information is not carried over.

  In the eighth invention, when the communication channel is changed during communication, the priority determining means determines the priority of the control channel when the wireless communication device has not acquired information on the communication channel of the change destination. If the change is canceled and the wireless communication device can acquire information about the communication channel of the change destination, the priority of the control channel of the change destination is changed based on the acquired information. Incorrect information about the channel is not carried over.

It is a block diagram of the mobile device of an embodiment of the invention. It is explanatory drawing of the table for control channel starting of embodiment of this invention. It is explanatory drawing of the table for control channel starting of embodiment of this invention. It is a state transition diagram of the mobile station of an embodiment of the invention.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of a mobile device (cellular phone) according to an embodiment of the present invention.

  The antenna 1 is connected to the transmission unit 2 and the reception unit 3, receives radio waves (downlink signals) from the radio base station, and transmits radio waves (uplink signals) to the radio base station. The radio unit 2 includes a transmission unit 3 and a reception unit 4, and the transmission unit 3 generates a high frequency signal transmitted from the antenna 1. The receiving unit 4 amplifies and frequency-converts the high frequency signal received by the antenna 1 and outputs it to the berth band processing unit 5 as a baseband signal.

The baseband processing unit 5 demodulates the baseband signal by a demodulation circuit. The demodulated signal is sent to the encoding / decoding unit 6, and is decoded into an audio signal and a data signal by the encoding / decoding unit 6. The encoding / decoding unit 6 encodes a voice signal and a data signal, and the encoded signal is sent to the baseband processing unit 5 and modulated.
The modulated signal is converted into a high-frequency signal by the transmission unit 3 and transmitted from the antenna 1.

  The control unit 9 controls each unit of the mobile phone such as the radio unit 2, the baseband processing unit 5, and the encoding / decoding unit 6. A channel is designated for the radio unit 2 to control the transmission / reception frequency. In addition, character information and display data for displaying the operation state of the mobile phone are sent to the display unit 11, and input of characters and numbers from the operation unit 12 and operation instructions to the mobile phone are accepted.

  In the present invention, the control unit 9 reads out a control channel (perch channel) number stored in advance from the storage unit 10, and receives the perch channel sequentially, and based on the received signal strength (RSSI) measured, Create an activation table and activate a control channel that gives strong received signal strength.

  FIG. 2 is a diagram illustrating creation of a control channel activation table from information on control channels (perch channels) stored in advance in the mobile device according to the embodiment of the present invention.

  The storage unit 10 of the mobile device stores a control channel number that the mobile device should receive first. At the time of power-on, the mobile station sequentially receives signals transmitted from the base station in the perch channel based on the control channel (perch channel) number, and measures the received signal strength (RSSI) in each channel. A control channel activation table is created in the order of received signal strength.

  FIG. 3 is a diagram illustrating creation of a control channel activation table in which a perch channel is offset in the mobile device according to the embodiment of the present invention.

  In the control channel activation table, perch channels to be received first by the mobile station are arranged in the order of received signal strength. A certain mobile station sequentially received ten perch channels, and obtained the reception results shown in the left table of FIG. At this time, since the perch channels 2, 4, and 7 are at the same level, the mobile device activates the upper perch channel in the table and enters a standby operation. When a call from the mobile device or an incoming call to the mobile device occurs and a call is started, a call channel corresponding to the waiting perch channel is activated.

  However, even if the received signal strength of the perch channel is strong when positioned higher than these tables, a call corresponding to the perch channel is caused by factors other than the received signal strength from the base station (for example, interference wave, external noise, etc.). The channel cannot be activated, and communication from the perch channel may fail. For example, the probability that the mobile device selects the perch channel 7 and activates the perch channel to wait is about one third. That is, when there is an interference wave in the call channel corresponding to the perch channel 2 and the perch channel 4 and the call is difficult, the call channel corresponding to these perch channels is waited on the perch channel 2 or the perch channel 4. Even if an attempt is made to activate the communication channel, activation of the call channel fails, and processing such as restarting the perch channel is required, which causes an increase in traffic. In addition, when a channel with low communication quality of the communication channel is specified from the base station at the time of handover, the channel fails to perform handover and cause a call disconnection.

  Therefore, once the call channel is successfully activated on the perch channel 7, a predetermined value (10 dBμ in this embodiment) is added to the received signal strength of the perch channel 7. As a result, the perch channel 7 comes higher in the control channel activation table. Therefore, since the mobile device is activated from the perch channel 7 when it is positioned higher in the control channel activation table, the activation of the communication channel is not failed, and the establishment of the communication and the failure of the handover are reduced.

  Next, the operation when the user packet channel is activated will be described with reference to FIG.

  As described above, the perch channels to be received first by the mobile station are arranged in the control channel activation table in the order of received signal strength. A certain mobile station sequentially received signals transmitted from the base station through 10 perch channels, and obtained reception results as shown in the left table of FIG. At this time, since the perch channels 2, 4, and 7 are at the same level, the mobile unit activates the upper perch channel (CCH) in the table and enters a standby operation. Then, when a packet communication call from the mobile device or a packet communication call to the mobile device occurs and the packet communication is started, the user packet channel corresponding to the waiting perch channel is activated.

  However, even if the received signal strength of the perch channel is high in these tables, the user corresponding to the perch channel due to factors other than the received signal strength from the base station (for example, interference wave, external noise, etc.) The packet channel cannot be activated, and communication from the perch channel may fail. For example, the probability that the mobile device selects the perch channel 7 and activates and waits is about one third. That is, when there is an interference wave in the user packet channel corresponding to the perch channel 2 and the perch channel 4 and packet communication is difficult, the user packet channel waits at the perch channel 2 or the perch channel 4 and is sent to these perch channels. Even if an attempt is made to activate the corresponding user packet channel, activation of the call channel fails, and processing such as restarting the perch channel is required, which causes an increase in traffic. In addition, when a channel with a low communication quality of the user packet channel is selected at the time of handover, the received signal strength of such a control channel is strong.

  Therefore, once the user packet channel is successfully activated in the perch channel 7, the reception signal strength of the perch channel 7 is set to a predetermined value (this embodiment) as in the case where the call channel is successfully activated. In this case, 10 dBμ) is added. As a result, the perch channel 7 comes higher in the control channel activation table. Therefore, since the mobile device is activated from the perch channel 7 when positioned higher, the activation of the user packet channel does not fail, and the establishment of communication and the failure of handover are reduced.

  In this embodiment, regarding the control channel activation table, an offset associated with the activation of the call channel (TCH) and an offset associated with the activation of the user packet channel (UPCH) are provided separately, and each communication method is provided. The priority with which the perch channel is selected is determined according to the activation status of the combined communication channel. That is, after the call channel (TCH) is activated (after voice communication), the control channel corresponding to the call channel that has been successfully activated is positioned at the upper level of the control channel activation table. It is activated preferentially and performs a standby operation on the control channel. In addition, after the user packet channel (UPCH) is activated (after packet communication), the control channel corresponding to the user packet channel that has been successfully activated is positioned higher in the control channel activation table. A channel is activated preferentially and performs a standby operation on the control channel.

  In this embodiment, a predetermined value is added to the measured value of the received signal strength of the perch channel related to the call channel and user packet channel that have been successfully activated, and the perch channel is offset so as to be higher in the control channel activation table. However, in the control channel activation table of the perch channel that has been successfully activated, the order may be changed so that it is positioned higher and the offset may be applied.

  FIG. 4 is a state transition diagram of the mobile device according to the embodiment of the present invention.

  When the mobile device is turned on, it reads out the control channel number stored in advance from the storage unit 10 and sequentially receives (scans) the control channel (perch channel). If no signal is received from the base station on any control channel, the scan is terminated and the out-of-service state is set. At this time, since the measurement result of the received signal strength is not obtained in any perch channel, the offset relating to the priority order of the perch channel set in the control channel activation table is initialized (cleared).

  On the other hand, when the control signal stored in advance is scanned and the measurement of the received signal strength (RSSI) of the surrounding control channels is finished, the control channels are arranged in descending order of the received signal strength, and a control channel activation table is created. Conventionally, the offset set in the control channel activation table is initialized (cleared). Then, the process shifts to standby in a control channel that gives a strong received signal strength.

  When the mobile station shifts to another zone (shift from CCH to CCH) due to reasons such as deterioration in reception quality of the control channel currently being received in the standby state, the communication channel (TCH, UPCH) corresponding to the control channel ) Reception quality may also change, the perch channel offset is initialized (cleared), the correction of the received signal strength value in the control channel activation table is canceled, and the rank is the state before correction. Return to.

  In addition, when communication is established from the standby state, the call channel (TCH) is activated, and the control channel (CCH) is switched to the call channel, an offset is applied so that the control channel that activated the call channel becomes higher. Then, the control channel activation table is updated so that the control channel is preferentially selected in the future.

  And if the position of the mobile device changes during a call and moves to another zone and switches to another call channel (after handover), the control channel that is the activation source of the transfer destination call channel is unknown. The perch channel offset is initialized (cleared), the correction of the received signal strength value in the control channel activation table is canceled, and the order is returned to the state before the correction. At this time, if the control channel related to the handover destination call channel is known, the call channel can be activated on the control channel. Therefore, an offset is applied so that the control channel is preferentially connected, and the control channel is activated. The table may be updated.

  In addition, when packet communication is established from the standby state, the user packet channel (UPCH) that is a packet communication channel is activated, and the control channel (CCH) is shifted to the user packet channel, in the control channel activation table, The control channel activation table is updated so that the control channel that activates the user packet channel is offset so that it is preferentially connected to the control channel in the future.

  Then, if the location of the mobile station changes during a call, transitions to another zone and switches to another user packet channel (after handover), the perch channel offset is initialized (cleared) to activate the control channel The correction of the received signal strength value in the table is canceled and the order is returned to the state before the correction. At this time, at the time of handover in the user packet channel, the control channel information of the adjacent channel is included in the broadcast content in the broadcast channel, and the mobile station has information on the control channel (perch channel) related to the user packet channel in the adjacent zone Therefore, it is possible to know the control channel related to the user packet channel of the handover destination, so that an offset is applied so that the control channel is preferentially connected in the future, and the control channel activation table is updated. Also good.

  In addition, when a transition is made to the call channel (TCH) to start a call from the activated user packet channel (UPCH), the offset is initialized (cleared), and the received signal strength value in the control channel activation table is corrected. Cancel and return the ranking to the initial state. At this time, if the control channel related to the call channel activated from the user packet channel is known, there is no problem in activation of the call channel, so an offset is applied so that the control channel is preferentially connected, and the control channel is activated. The table for use may be updated.

  In an embodiment of the present invention, in a mobile device that performs radio communication with a base station using a selected channel, the reception intensity of a signal transmitted from the base station on a pre-stored control channel (perch channel) (RSSI) monitoring means, priority determination means for determining a priority to connect to the perch channel based on RSSI of the perch channel, and creating a control channel activation table, and priority determination means Channel selection means for selecting a channel for connecting the mobile station and the base station based on the priority, and the priority determination means is a communication channel (TCH) corresponding to a specific channel among these control channels. , UPCH), the priority for the specific channel is changed when communication is established. Against Le, since preferentially connected in the subsequent connection, it is possible to improve the success rate of channel activation.

  Further, since the priority determining means has RSSI changing means for adding a predetermined value to the received signal strength related to the control channel with which communication has been established, communication among the perch channels with good RSSI located at the top of the control channel activation table. The perch channel that has been successfully activated for the communication channel (TCH, UPCH) is positioned higher in the control channel activation table, so that it can be preferentially connected to the perch channel once communication is established. The success rate can be improved.

  The priority determining means has priority order changing means for changing the priority related to the perch channel for which communication has been established to a higher order, and the priority order changing means changes the order related to the channel to the higher order. Since the priority order for the channels that have been successfully activated (TCH, UPCH) is changed, the perch channel that has been successfully activated is used to activate the control channel among the perch channels that are positioned higher in the control channel activation table. Positioning higher in the table, it is possible to preferentially connect to the perch channel once communication is established, and the success rate of channel activation can be improved.

  In addition, the mobile device can perform voice communication using a call channel (TCH) and packet communication using a user packet channel (UPCH), and the priority determination means can determine whether the mobile device uses a call channel (TCH). Since the offset related to the used communication and the offset related to the communication using the user packet channel (UPCH) are set separately, it is possible to select an optimum channel for activation for each communication procedure.

  That is, the monitoring means for monitoring the reception strength (RSSI) of the signal transmitted from the base station in the perch channel to be received first by the mobile device, and the priority for creating the control channel activation table based on the RSSI of the perch channel Priority determination means, and channel selection means for selecting a channel connecting the mobile station and the base station based on the rank of the perch channel in the control channel activation table depending on the received signal strength of the perch channel. Since the determination means activates the communication channel (TCH, UPCH) in a specific channel among the perch channels to be received first by the mobile station and communication is established, the priority for the specific channel is changed in subsequent connections. The perch channel corresponds to the communication channel once established. Chi subjected to the operation, since preferentially connected to the communication channel corresponding to these perch channels, it is possible to improve the success rate of the channel connection.

  Further, when the mobile device changes the communication means between communication using the call channel (TCH) and communication using the user packet channel (UPCH), the perch channel offset in the communication procedure of the change destination is changed. Since it is erased (priority is initialized), erroneous information regarding the control channel is not taken over. Furthermore, if the mobile device can acquire information on the control channel related to the channel used in the communication procedure of the change destination, the information is acquired and the priority related to the change destination channel is changed based on the activation of the channel. It is possible to select an appropriate control channel even after changing the communication procedure.

  Further, when the control channel (CCH) used for standby is changed during standby, the priority determination means deletes the offset of the control channel that the mobile station should receive first (initializes the priority). Incorrect information about the control channel is not taken over. Furthermore, since the priority determination means deletes the offset of the control channel (initializes the priority) when the channel (TCH, UPCH) is changed during communication, it does not take over erroneous information regarding the control channel. .

  In addition, if the mobile station can acquire control channel information related to the change destination channel, the information is acquired and the priority related to the change destination channel is changed based on the activation of the channel. An appropriate channel can be selected even after the change.

DESCRIPTION OF SYMBOLS 1 Antenna 2 Radio | wireless part 3 Transmitter 4 Receiving part 5 Baseband process part 6 Encoding / decoding part 7 Transmission part 8 Reception part 9 Control part 10 Storage part 11 Display part 12 Operation part 20 Mobile device (cell-phone)
30 base station

Claims (8)

In a wireless communication device that performs wireless communication with a base station on a selected channel,
Monitoring means for monitoring a plurality of predetermined control channels;
Priority determining means for determining a priority for selecting a control channel based on a monitoring result by the monitoring means;
Channel selection means for selecting a control channel used by the wireless communication device based on the priority determined by the priority determination means;
The priority determination means changes the priority of the control channel corresponding to the communication channel that has been successfully activated when the communication channel is successfully activated from a certain control channel among the control channels. Wireless communication device. The priority determining means includes
Monitoring result changing means for changing the monitoring result of the control channel related to the channel in which the communication is established;
The wireless communication apparatus according to claim 1, wherein the priority of the channel is changed by the monitoring result changing unit changing the monitoring result of the channel. The priority determining means includes
Priority order changing means for changing the priority of the control channel related to the channel in which the communication is established to higher order;
2. The wireless communication device according to claim 1, wherein the priority of the channel is changed by the priority changing unit changing the rank of the channel to a higher rank. A communication means for performing communication according to a first procedure and communication according to a second procedure as the wireless communication;
The said priority determination means sets the priority of a control channel separately for the communication by a 1st procedure, and the communication by a 2nd procedure, The Claim 1 characterized by the above-mentioned Wireless communication device. When the communication means changes from communication according to the first procedure to communication according to the second procedure, or from communication according to the second procedure to communication according to the first procedure,
When the wireless communication device has not acquired information on the control channel used in the communication procedure of the change destination, cancel the change in the priority of the control channel,
If the wireless communication device can acquire information on the control channel used in the communication procedure of the change destination, the priority of the control channel used in the communication procedure after the change is changed based on the acquired information. The wireless communication device according to claim 4. The wireless communication apparatus according to claim 5, wherein the communication according to the first procedure is voice communication, and the communication according to the second procedure is packet communication. The priority determination means cancels the priority change of the control channel when changing the control channel used for standby during standby. The wireless communication device described in 1. The priority determination means cancels the change of the priority of the control channel when the communication channel is changed during communication and the wireless communication device has not acquired information on the communication channel of the change destination. The priority of the control channel of the change destination is changed based on the acquired information if the wireless communication device can acquire information on the communication channel of the change destination. The wireless communication device according to any one of 7.

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