JP4895227B2 - Radio IP telephone apparatus with radio wave stabilization function, communication method thereof and program thereof - Google Patents

Description

  The present invention scans surrounding antennas to obtain a plurality of quality messages when a call is started after a call operation or when a call is started after an incoming call is answered. Wireless IP telephone apparatus with radio wave stabilization function, communication method thereof, and program thereof, characterized in that high quality voice quality is ensured by starting a call after belonging to an optimal antenna About.

  The wireless IP telephone apparatus uses a wireless LAN wireless interface, which is a data infrastructure.

  When voice packets are transmitted / received by wireless LAN network communication, if a received packet loss occurs, call voice quality deteriorates.

  The wireless LAN is a best-effort network in which when a received packet exceeding the network capability is input, the excess received packet is discarded. In addition, since the wireless LAN continues to belong to the current antenna as long as the reception intensity is within a range in which packet communication is possible even during a call, voice communication can be performed even with a non-optimal antenna. As a result, transmission quality deteriorates, and received packet loss occurs.

  Further, since voice communication is continued even when the call is not attributed to the optimal antenna, there is a problem that the voice call quality deteriorates.

  Therefore, Patent Document 1 discloses a technique that uses the strength of the received electric field level as a material for determining transmission quality.

  In Patent Document 2, when there is a call from a wireless telephone terminal belonging to a wireless access point that has reached the maximum number of simultaneous calls, or when there is an incoming call to the wireless telephone terminal, the wireless telephone terminal attribution process Is disclosed, and a technique for causing the wireless telephone terminal to belong to a wireless access point that has not reached the maximum number of simultaneous calls by rejecting the attribution request for the wireless access point that has reached the maximum number of simultaneous calls is disclosed. Yes.

  In Patent Document 3, throughput is calculated for each wireless access point, a wireless access point with the highest communication throughput is selected, and connection processing is started. However, a technique is disclosed in which when there are a plurality of wireless access points having the highest communication throughput, a wireless access point having the strongest received signal strength is selected from them.

In Patent Document 4, when it is determined that the value of the received radio wave intensity received from the wireless LAN base station belonging to the wireless LAN mobile station is equal to or less than a threshold value that is a handover execution reference, the handover is executed, and When the communication quality between the wireless LAN mobile station and the wireless LAN base station belonging to the wireless LAN mobile station is determined to be lower than the predetermined communication quality, the threshold value used as a handover execution reference is increased by a predetermined value. Techniques for controlling are disclosed.
Japanese Patent Laid-Open No. 05-183955 JP 2006-332764 A JP 2007-110373 A JP 2007-251652 A

  Conventionally, a wireless IP telephone apparatus waits for an antenna that belonged at the time of location registration. Since the wireless IP telephone apparatus does not distinguish between voice and data, the location registration attributed in advance is not changed when a call is started. For this reason, as the antenna belonging to the start of the call, the call was attributed to the same antenna as the standby time, and the call was started.

  For this reason, there are cases where a more optimal antenna is actually located nearer than the antenna that was assigned at the time of standby. It was.

  In Patent Document 1, the strength of the reception electric field level is used as a material for determining transmission quality. However, when antennas with different transmission outputs are located in an environment around them, Since the transmission output is stronger, there is a problem that the reception level is considered to be high and the transmission quality may be erroneously determined. For example, as shown in FIG. 12 for explaining the background of the present invention, the antenna 6 has a higher received electric field level, but in reality, the distance is far, so that the packet from the wireless IP telephone 1 does not reach sufficiently. The transmission quality is getting worse.

  Also, as in Patent Document 2, refusing an attribution request for a wireless access point that has reached the maximum number of simultaneous calls has a problem that it does not lead to a drastic solution for connection in consideration of transmission quality. .

  In Patent Document 3, if only the reception strength level is used to determine the optimum antenna, if there is an antenna with a different transmission output, the antenna that is actually located far but has a larger transmission output is used. , There is a problem of accidental attribution.

  According to Patent Document 4, when a plurality of communication qualities are determined at the time of handover when moving and switching antennas during a call, the handover takes time, the call is interrupted, and the call voice quality deteriorates. There is a problem of doing.

  The present invention has been made in view of the above, and is a radio wave stabilization function that, when a call is started, obtains a plurality of quality messages and belongs to an optimal antenna, thereby ensuring high quality call voice quality. An object of the present invention is to provide a wireless IP telephone apparatus, a communication method thereof, and a program thereof.

  In order to solve the above-described problem, the wireless IP telephone apparatus according to the present invention broadcasts a Probe request to a plurality of antennas in the vicinity, and transmits the Probe request and a Probe response from the antenna to the Probe request. In the wireless IP telephone apparatus that determines the optimum antenna for communication based on the probe request and the probe response, the average noise level is small, the arrival time of the probe response packet is short, the antenna use band, that is, the load balance A wireless unit that obtains a scan result for the antenna with six types of quality messages, that is, the encryption level of the radio section is high, the frame error rate of the received packet is small and large, and the transmission speed from the antenna is slow or slow And the antenna A management table describing priorities, and for each of the six types of quality messages, evaluate whether the antenna is higher or lower in the order on the management table, and depending on the six types of quality messages A control unit that determines the priority order of the antennas by comprehensively evaluating each evaluation, describes the priority order in the management table, and determines the optimum antenna based on the description; and And the control unit causes the radio unit to perform broadcast transmission of the Probe request triggered by a call start notified from the audio unit, and the radio unit instructs the control unit to To switch to the optimum antenna.

  In order to solve the above problem, the communication method of the wireless IP telephone apparatus according to the present invention broadcasts a Probe request to a plurality of antennas in the vicinity, and transmits the Probe request and the Probe from the antenna for the Probe request. A wireless IP telephone apparatus communication method for determining an optimal antenna for communication based on a response, from a procedure for performing broadcast transmission of the Probe request using a call start as a trigger, the Probe request, and the Probe response, The average noise level is small, the probe response packet arrival time is short, the antenna band used, that is, the load balance is small, the wireless section encryption level is high, the frame error rate of the received packet is small, and the antenna Transmission speed Evaluation of whether the antenna is higher or lower in the procedure for obtaining the scan results having the six types of quality messages of the fast and slow for the antenna and the order on the management table describing the priority of the antenna Are described for each of the six types of quality messages, a procedure for determining the priority order of the antennas by comprehensively evaluating each of the six types of quality messages, and the priority levels are described in the management table. And a procedure for determining the optimal antenna based on the description, and a procedure for switching to the optimal antenna based on the determination.

  In order to solve the above-described problem, the program of the wireless IP telephone apparatus according to the present invention broadcasts a Probe request to a plurality of surrounding antennas, and a Probe response from the antenna to the Probe request and the Probe request. A wireless IP telephone apparatus program that determines an optimal antenna for communication based on the above, and from the process of performing broadcast transmission of the Probe request triggered by the start of a call, and the average noise from the Probe request and the Probe response Small and large levels, short and short probe response packet arrival times, bandwidth used by the antenna, that is, little load balance, high and low encryption levels in the radio section, small and large frame error rate of received packets, and transmission from the antenna Whether the antenna is high-order or low-order in the process of obtaining scan results having six types of quality messages, that is, slow and fast, for the antenna and the order on the management table that describes the priority of the antenna A process for evaluating each of the six types of quality messages, a process for determining the priority order of the antennas by combining the evaluations based on the six types of quality messages, and the priority levels in the management table And a process of determining the optimal antenna based on the description, and a process of switching to the optimal antenna based on the determination.

  As described above, according to the present invention, the control unit causes the radio unit to perform broadcast transmission of the Probe request triggered by the start of a call notified from the voice unit, and the radio unit receives the Probe request and the Probe response from , Small and large average noise level, short and short arrival time of Probe response packet, small band of antenna use, that is, load balance, high and low encryption level of radio section, small and large frame error rate of received packet, and antenna A scan result having six types of quality messages, that is, a transmission rate from a low rate, is obtained for the antenna, and a control unit determines the priority order of the antennas by comprehensively evaluating each of the six types of quality messages. , By determining the best antenna and belonging to it, high quality call voice products To ensure, radio stable function with the wireless IP telephone apparatus, it is possible to provide a communication method thereof and a program thereof.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, FIG. 1 is a configuration diagram showing a main part of a circuit configuration of a wireless IP telephone which is a wireless IP telephone apparatus according to the present embodiment.

  Referring to FIG. 1, radio IP phone 1 according to the present embodiment (1) average noise from broadcast transmission of a Probe request to surrounding antennas and a Probe response which is a response to a Probe request from surrounding antennas. (2) Shortness of arrival time of Probe response packet, (3) Low load balance (band used by antenna), (4) High or low encryption level of radio section, (5) Received packet (6) Radio unit 2 that obtains scan results having six types of quality messages for each antenna and switches to the optimum antenna according to instructions from control unit 3 Then, the above-mentioned six types of quality messages are acquired from the radio unit 2, and each of these six types of quality messages is used as a judgment material. The control unit 3 that determines the priority order of the antennas, describes the priority order in the management table 5 that the mobile station itself has, determines the optimum antenna based on the description in the management table 5, and the voice unit that informs the control unit 3 of the start of the call 4.

  Note that the term “call start” here means a call operation when making a call, and a response operation when receiving a call.

  The management table 5 has the configuration shown in FIG. The management table 5 includes (1) small average noise level, (2) short arrival time of Probe response packet, (3) small load balance (band used by antenna), (4) encryption in radio section The priority levels of the antennas are ranked for the six types of quality messages, which are: high and low conversion levels, (5) small and large frame error rates of received packets, and (6) fast and slow transmission rates from the antennas.

  FIG. 3 shows a specific procedure for determining the ranking.

  When the wireless IP phone 1 broadcasts a Probe request to scan each antenna and obtains a Probe response as a response from each antenna, the wireless unit 2 obtains the above-described six types of quality messages as scan results.

  The control unit 3 evaluates whether each antenna is higher or lower in the management table 5 for each of the six types of quality messages that are the scan results, and comprehensively evaluates each of the six types of quality messages. Determine the priority of each antenna. The control unit 3 describes the priority order of each antenna in the management table 5 and determines an optimum antenna based on the management table 5.

  Next, the operation of the present embodiment will be described in more detail. Here, FIG. 4 is a diagram showing a state when the wireless IP phone 1 is starting a call.

  When a wireless IP phone 1 starts a call, it broadcasts a Probe request to surrounding antennas and scans it. In the broadcast transmission of the Probe request, first, the voice unit 4 notifies the control unit 3 of the start of the call, and the control unit 3 executes the broadcast transmission of the Probe request to the wireless unit 2 using the call start notified from the voice unit 4 as a trigger. Let

  Thereafter, the wireless IP phone 1 waits for a response of the Probe response from the surrounding antenna.

  The wireless unit 2 obtains the above-described six kinds of quality messages as the scan results of the surrounding antennas from the broadcast transmission of the Probe request and the response of the Probe response.

  The control unit 3 determines the priority of each antenna by evaluating these six types of quality messages.

  The control unit 3 determines that the antenna having a high priority in the management table 5 is the optimum antenna for communication, and causes the wireless IP phone 1 to belong to the optimum antenna.

  Here, FIG. 5 is a specific example of the operation when the antenna 7 is determined to be the optimum antenna. Although FIG. 5 shows a situation in which two antennas can be confirmed in the area as a representative, the control unit 3 determines an optimal antenna even when there are two or more antennas in the vicinity.

  In determining the optimum antenna, as described above, the control unit 3 uses the management table 5 in which the priority order of each antenna is ranked based on the six types of quality messages sent from the radio unit 2.

  A specific example of determination for six types of quality messages is shown below.

(1) Smallness of average noise level FIG. 6 is a diagram showing a determination regarding the magnitude of the average noise level. When there is a difference in the average noise level of the surrounding antennas due to a difference in frequency channels used by the surrounding antennas, the radio unit 2 determines that the one with the smaller average noise level is a high-quality antenna. To do.

  In the example of FIG. 6, since the average noise level around the antenna 7 is smaller than the average noise level around the antenna 6, the antenna 7 is determined to be a higher quality antenna.

(2) Shortness of arrival time of Probe response packet FIG. 7 is a diagram showing a determination about a short arrival time of Probe response packet. When the wireless IP phone 1 scans and searches surrounding antennas, it transmits a Probe request packet. Thereafter, Probe response packets are returned from the surrounding antennas. If the arrival time of the response at this time is long, the wireless unit 2 determines that the transmission quality is deteriorated.

  In the example of FIG. 7, the probe response packet from the antenna 6 has failed to be transmitted twice and finally the probe response packet is returned to the wireless IP phone 1 for the third time. Since the Probe response packet from the antenna 7 is returned in the first transmission, the arrival time of the Probe response packet from the antenna 7 is short, and therefore the antenna 7 is determined to have higher quality.

(3) Minority of load balance (band used of antenna) FIG. 8 is a diagram showing a judgment on whether there is a lot of load balance (band of antenna use). When a plurality of other wireless IP phones 8 belong and are making a call, the band used for the antenna is often used, and the remaining band used is small. If a large bandwidth is used, sufficient packets cannot be exchanged, resulting in poor voice quality.

  In the example of FIG. 8, since the antenna 6 has already made three calls with another wireless IP phone 8, the bandwidth used is increased. Since the antenna 7 has not yet been assigned to another wireless IP telephone 8, the use band is small, and the wireless unit 2 determines that the antenna 7 is of higher quality.

  The use band of the antenna may be notified to the Probe response as additional information from each antenna. Alternatively, after receiving the Probe response, a message may be exchanged with each antenna to notify the use band information.

(4) High and Low Encryption Level of Wireless Section FIG. 9 is a diagram showing a determination about the encryption level of the wireless section. When a plurality of encryption methods are supported, the one with the higher encryption level in the wireless section (the one that is difficult to decrypt) is selected.

  In the example of FIG. 9, the antenna 6 uses TKIP (Temporal Key Integrity Protocol) for encryption. On the other hand, the antenna 7 uses AES (Advanced Encryption Standard) for encryption.

  As an encryption method, since the level of AES is higher than that of TKIP (it is harder to be decrypted), the radio unit 2 determines that the antenna 7 has higher quality.

  As the encryption level of the wireless section, AES is the highest quality, and then TKIP. Following TKIP is WEP (Wired Equivalent Privacy). In the case of WEP, it is determined that the 104-bit secret key length is higher than the 40-bit secret key length in terms of the secret key length.

  The encryption level of the antenna may be notified to the Probe response as additional information from each antenna. Alternatively, after receiving the Probe response, a message may be exchanged with each antenna to notify the encryption level information.

(5) Decrease in Frame Error Rate of Received Packet FIG. 10 is a diagram showing a determination about the size of the frame error rate of the received packet. The frame error rate of the received packet is monitored (calculated) by the wireless unit 2 by exchanging with the antenna, and the frame error rate of the received packet is notified to the control unit 3 when determining the optimum antenna.

  In the example of FIG. 10, since the antenna 6 has a larger frame error rate of the received packet, it can be determined that the antenna 7 has higher quality.

(6) Fast / Slow of Transmission Rate from Antenna FIG. 11 is a diagram showing a determination on whether the transmission rate from the antenna is fast or slow. For example, when an 802.11b wireless LAN is used in the wireless section, four types of transmission speeds of 1 Mbps, 2 Mbps, 5.5 Mbps, and 11 Mbps can be used, and a higher transmission speed is selected from these. .

  In the example of FIG. 11, since the antenna 6 has a transmission rate of 2 Mbps and the antenna 7 has a transmission rate of 11 Mbps, it can be determined that the antenna 7 is a higher quality antenna.

  Here, when searching for the antenna, the radio unit 2 searches for the antenna in accordance with the order of all radio channels (1ch, 2ch ~).

  The radio unit 2 passes the six quality messages of the antenna to the control unit 3.

  As shown in the flowchart of FIG. 3, the control unit 3 sequentially evaluates six quality messages, and assigns each antenna to the higher priority and the lower priority in order.

  When the six quality messages are prioritized and prioritized, the priority is determined in the “priority” column in the management table 5 shown in FIG. 2 and is registered in the management table 5 in the descending order of priority. .

  The wireless IP phone 1 realizes that when a call is started, the call is started by switching to an optimum antenna.

  Note that the evaluation of “upper management table” and “lower management table” shown in the flow chart of FIG. 3 is performed on the management table 5 in all the quality evaluations (1) to (6) described above. As a rule, the ranking is higher or lower by one step. However, at least one or more quality messages out of the six types of quality messages may be subjected to weighted evaluation so that the antenna is weighted so that it is ranked higher or lower than the second rank in the management table. For example, when priority is given to an antenna with a low noise level, (1) in the evaluation of the average noise level, when the average noise level is low, the two-level rank may be increased on the management table 5. As a result, the condition for determining the antenna to be prioritized can be set more flexibly.

  In this embodiment, (1) the average noise level is small and large, (2) the arrival time of the Probe response packet is short, (3) the load balance (band used by the antenna) is small, (4) wireless The optimum antenna was determined based on six types of quality messages: high and low encryption level of the section, (5) small and large frame error rate of the received packet, and (6) fast and slow transmission rate from the antenna. These six kinds of quality messages may be used alone as judgment materials.

  Furthermore, the control unit 3 may determine an optimum antenna by appropriately combining these quality messages.

  The present invention is a wireless IP that transmits and receives voice packets via a wireless LAN network such as a wireless IP telephone, a wireless LAN mobile phone, a PC soft telephone (PC telephone application software having a wireless LAN interface), and a wireless LAN terminal adapter. It can be used for telephone devices.

It is a block diagram which shows the principal part of the circuit structure of the radio | wireless IP telephone which is the radio | wireless IP telephone apparatus which concerns on this Embodiment. It is a structural example of the management table which concerns on this Embodiment. It is the flowchart which showed the specific procedure of judgment of the ranking of the antenna by the control part of the radio | wireless IP telephone apparatus which concerns on this Embodiment. It is a figure which shows the state when the radio | wireless IP telephone which concerns on this Embodiment has started the telephone call. It is a figure which shows the specific example of operation | movement when the optimal antenna is determined in this Embodiment. It is a figure which shows judgment about the magnitude of the average noise level by the control part of the radio | wireless IP telephone apparatus which concerns on this Embodiment. It is a figure which shows the judgment about the short length of the arrival time of a Probe response packet by the control part of the radio | wireless IP telephone apparatus which concerns on this Embodiment. It is a figure which shows the judgment about the little of the load balance (bandwidth of an antenna) by the control part of the radio | wireless IP telephone apparatus which concerns on this Embodiment. It is a figure which shows judgment about the level of the encryption level of the radio | wireless area by the control part of the radio | wireless IP telephone apparatus which concerns on this Embodiment. It is a figure which shows the judgment about the magnitude | size of the frame error rate of the received packet by the control part of the radio | wireless IP telephone apparatus which concerns on this Embodiment. It is a figure which shows the judgment about the speed of the transmission rate from an antenna by the control part of the radio | wireless IP telephone apparatus which concerns on this Embodiment. It is a figure explaining the background of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wireless IP telephone 2 Wireless part 3 Control part 4 Voice part 5 Management table 6 Antenna 7 Antenna 8 Other wireless IP telephones

Claims (27)

In a wireless IP telephone apparatus that broadcasts a Probe request to a plurality of surrounding antennas and determines an optimal antenna for communication based on the Probe request and a Probe response from the antenna to the Probe request,
From the probe request and the probe response, the average noise level is small and large, the response time of the probe response packet is short, the antenna use band, that is, the load balance is small, the encryption level of the radio section is high and low, the received packet A radio unit that obtains a scan result for the antenna with six kinds of quality messages of small and large frame error rate and fast and slow transmission rate from the antenna;
A management table that describes the priority order of the antennas, and for each of the six types of quality messages, evaluates whether the antenna is higher or lower in the order on the management table; A control unit that determines the priority order of the antennas by combining the respective evaluations based on the quality message, describes the priority order in the management table, and determines the optimal antenna based on the description;
An audio unit that informs the control unit of the start of a call;
With
The control unit triggers a call start notified from the voice unit, and causes the radio unit to execute broadcast transmission of the Probe request,
The radio IP telephone apparatus, wherein the radio unit switches to the optimum antenna according to an instruction from the control unit.   When the average noise level in the scan result has a difference in the average noise level of the plurality of antennas present around the radio unit, the radio unit determines that the average noise level is smaller as a high-quality antenna. The wireless IP telephone apparatus according to claim 1, wherein the wireless IP telephone apparatus is determined.   The wireless unit transmits a short response time of the Probe response packet in the scan result when the arrival time of the Probe response packet from the surrounding antenna is long after sending out the Probe request packet. 2. The wireless IP telephone apparatus according to claim 1, wherein it is determined that the quality is deteriorated.   For the use band of the antenna in the scan result, that is, the load balance, the wireless unit is information added from the antenna to the Probe response or by exchanging a separate message with the antenna after receiving the Probe response, The wireless IP telephone apparatus according to claim 1, wherein a use band of the antenna is determined.   The wireless unit determines whether the encryption level is high or low by exchanging information added to the Probe response from the antenna or a separate message with the antenna after receiving the Probe response. The wireless IP telephone apparatus according to claim 1, wherein the wireless IP telephone apparatus is determined.   2. The wireless IP telephone apparatus according to claim 1, wherein the wireless unit calculates the frame error rate of the received packet by exchanging with the antenna. 3.   2. The wireless IP telephone apparatus according to claim 1, wherein the wireless unit determines that the transmission speed from the antenna is higher than that of the antenna with a higher transmission speed.   The control unit performs weighted evaluation so that at least one quality message among the six types of quality messages is weighted so that the antenna is ranked two or more, higher or lower in the management table. The wireless IP telephone apparatus according to any one of claims 1 to 7.   The said control part determines the priority of the said antenna using any one or two or more of the said six types of quality messages as judgment material, The one of Claim 1 thru | or 7 characterized by the above-mentioned. Wireless IP telephone device. A wireless IP telephone apparatus communication method that broadcasts a Probe request to a plurality of surrounding antennas and determines an optimum antenna for communication based on the Probe request and a Probe response from the antenna to the Probe request. There,
From the probe request and the probe response, the procedure for performing the broadcast transmission of the probe request triggered by the start of a call, the average noise level is small, the arrival time of the probe response packet is short, the use band of the antenna, that is, the load balance A procedure for obtaining a scan result for the antenna having six types of quality messages, that is, a high or low encryption level in a wireless section, a small or large frame error rate of a received packet, and a slow transmission rate from the antenna; ,
A procedure for evaluating each of the six types of quality messages by evaluating whether the antenna is higher or lower in the order on the management table describing the priority of the antenna;
A procedure for determining the priority order of the antennas by combining the evaluations of the six types of quality messages;
A procedure for writing the priority in the management table;
Determining the optimal antenna based on the description;
A procedure for switching to the optimal antenna based on the determination;
A communication method for a wireless IP telephone apparatus, comprising:   The procedure for obtaining the scan result for the antenna is such that the average noise level in the scan result is smaller when the average noise level of the plurality of antennas present in the vicinity is different. The wireless IP telephone apparatus communication method according to claim 10, wherein the wireless IP telephone apparatus is determined to be a high-quality antenna.   The procedure for obtaining the scan result for the antenna is as follows: For the short arrival time of the Probe response packet in the scan result, the arrival time of the Probe response packet from the surrounding antenna after sending the Probe request packet The communication method of the wireless IP telephone apparatus according to claim 10, wherein when it is long, it is determined that the transmission quality is deteriorated.   The procedure for obtaining the scan result for the antenna is as follows. For the use band of the antenna in the scan result, that is, for the load balance, information added from the antenna to the Probe response or with the antenna after receiving the Probe response. The communication method of the wireless IP telephone apparatus according to claim 10, wherein a use band of the antenna is determined by exchanging a message separately.   The procedure for obtaining the scan result for the antenna is as follows: For the encryption level of the wireless section, information added from the antenna to the Probe response or by exchanging a separate message with the antenna after receiving the Probe response, 11. The wireless IP telephone apparatus communication method according to claim 10, wherein the level of the encryption level is determined.   The communication method of the wireless IP telephone apparatus according to claim 10, wherein the step of obtaining the scan result for the antenna calculates the magnitude of the frame error rate of the received packet by exchanging with the antenna. .   11. The wireless IP according to claim 10, wherein the procedure for obtaining the scan result for the antenna determines that the transmission speed from the antenna is higher than that of the antenna with a higher transmission speed. 11. A communication method for a telephone device.   In the order on the management table, the procedure for evaluating whether the antenna is higher or lower is performed for each of the six types of quality messages. The wireless IP telephone apparatus according to any one of claims 10 to 16, wherein the message is subjected to a weighted evaluation in which the antenna is weighted so that the antenna is ranked higher or lower in the management table. Communication method.   In the order on the management table, the procedure for evaluating whether the antenna is higher or lower is performed for each of the six types of quality messages according to any one or two of the six types of quality messages. The communication method of the wireless IP telephone apparatus according to any one of claims 10 to 16, wherein the priority order of the antennas is determined using the above as a criterion. A program of a wireless IP telephone apparatus that broadcasts a Probe request to a plurality of surrounding antennas and determines an optimal antenna for communication based on the Probe request and a Probe response from the antenna in response to the Probe request. And
Processing to broadcast the Probe request triggered by the start of a call, and from the Probe request and the Probe response, the average noise level is small, the arrival time of the Probe response packet is short, the antenna usage band, that is, the load balance A process of obtaining a scan result for the antenna with six types of quality messages, that is, a high or low encryption level in a wireless section, a small or large frame error rate of a received packet, and a slow or slow transmission rate from the antenna; ,
A process of evaluating whether the antenna is higher or lower in the order on the management table describing the priority of the antenna, for each of the six types of quality messages;
A process of determining the priority order of the antennas by combining the evaluations of the six types of quality messages;
A process of writing the priority in the management table;
A process of determining the optimal antenna based on the description;
A process of switching to the optimal antenna based on the determination;
A program for a wireless IP telephone apparatus, characterized in that the wireless IP telephone apparatus is executed.   The process of obtaining the scan result for the antenna is such that when the average noise level in the scan result is small, if there is a difference in the average noise level of the plurality of antennas present in the vicinity, the one with the smaller average noise level 20. The wireless IP telephone apparatus program according to claim 19, wherein the wireless IP telephone apparatus program is determined as a high-quality antenna.   The process of obtaining the scan result for the antenna is the arrival time of the Probe response packet from the surrounding antenna after sending the Probe request packet for the short and long arrival time of the Probe response packet in the scan result. The wireless IP telephone apparatus program according to claim 19, wherein when it is long, it is determined that the transmission quality is deteriorated.   The process of obtaining the scan result for the antenna is performed by using information added to the Probe response from the antenna or the antenna after receiving the Probe response for the use band of the antenna in the scan result, that is, a load balance. 20. The wireless IP telephone apparatus program according to claim 19, wherein the use band of the antenna is determined by exchanging a message separately.   The process of obtaining the scan result for the antenna is performed by exchanging information added to the Probe response from the antenna or a separate message with the antenna after receiving the Probe response for the encryption level of the wireless section. 20. The program for a wireless IP telephone apparatus according to claim 19, wherein the level of the encryption level is determined.   20. The program of the wireless IP telephone apparatus according to claim 19, wherein the process of obtaining the scan result for the antenna calculates the magnitude of the frame error rate of the received packet by exchanging with the antenna.   The wireless IP according to claim 19, wherein the process of obtaining the scan result for the antenna determines that the transmission speed from the antenna is a high-quality antenna with a higher transmission speed. A telephone device program.   In the ranking on the management table, the process of evaluating whether the antenna is higher or lower is performed for each of the six types of quality messages. The wireless IP telephone apparatus according to any one of claims 19 to 25, wherein the message is subjected to a weighted evaluation in which the antenna is weighted so as to be higher or lower than two ranks in the management table. Program.   In the order on the management table, the process of evaluating whether the antenna is higher or lower is performed for each of the six types of quality messages in any one or two of the six types of quality messages. 26. The program for a wireless IP telephone apparatus according to claim 19, wherein the priority order of the antennas is determined based on the above information.

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