JP6515630B2 - Wireless communication device - Google Patents

Description

  The present invention relates to a wireless communication apparatus, and more particularly to a wireless communication apparatus that performs wireless communication in a time division multiple access (TDMA) network.

  There is a TDMA network in which a plurality of wireless communication devices maintain synchronization at the same timing. In this TDMA network, it is important for wireless communication devices to establish synchronization, and such a method is disclosed in Patent Document 1.

  Then, in the TDMA network, as shown in FIG. 1, the TDMA network may be separated into two or more due to changes in the wireless environment, and it may often be necessary to maintain synchronization at independent timings (from Case 1 in FIG. 1). See Case 2, 10, 20). Although this timing gap depends on the accuracy of the transmitter mounted on the wireless communication device, a high-precision transmitter is expensive, and it is not easy to mount on a wireless communication device that requires cost reduction. Absent.

  In a situation where this timing gap can not be ignored, after the TDMA network is separated, the wireless environment may change again, and wireless communication may become possible from a part of each other's TDMA network (Case 2 to Case 3 in FIG. 1) . In this case, the synchronization can not be immediately restored in all the wireless communication devices, and the timing is sequentially corrected from the specific wireless communication device 14 which is relatively close and capable of wireless communication, and the synchronization is restored. (Refer to Case 3 to Case 4 in FIG. 1 and reference numeral 30). Then, the synchronization is restored in all the wireless communication devices 11 to 15 (Case 5 in FIG. 1).

JP, 2011-234327, A

  However, in the situation of Case 4 of FIG. 1, while the above-mentioned specific wireless communication device 14 is restored to synchronization, the wireless communication device 15 which can not perform direct wireless communication with another TDMA network temporarily uses the same TDMA. There is a problem that the synchronization timing with the network wireless communication device can not be followed, and the synchronization is broken. For a user who uses this wireless communication apparatus, if communication with the wireless communication apparatus that seems to be communicable is disconnected unexpectedly, this will cause a major problem in operation. The number of wireless communication devices whose wireless communication is disconnected in this manner increases as the size of the TDMA network increases.

  Therefore, an object of the present invention is to provide a wireless communication apparatus capable of solving the above-mentioned problem that wireless communication is disconnected.

A wireless communication apparatus according to an aspect of the present invention is
A wireless communication apparatus comprising a synchronization processing unit that performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication apparatus, comprising:
When the synchronization processing unit receives a synchronization signal from a wireless communication device belonging to another TDMA network that has a synchronization timing different from that of the TDMA network to which the own device belongs, the synchronization processing unit belongs to the own device based on the received synchronization signal. Change the synchronization timing of the TDMA network while maintaining the synchronization status in the TDMA network
Take the composition.

In addition, a program which is an embodiment of the present invention is
In the arithmetic device provided in the wireless communication device,
A program for realizing a synchronization processing unit that performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication device, comprising:
When the synchronization processing unit receives a synchronization signal from a wireless communication device belonging to another TDMA network that has a synchronization timing different from that of the TDMA network to which the own device belongs, the synchronization processing unit belongs to the own device based on the received synchronization signal. Change the synchronization timing of the TDMA network while maintaining the synchronization status in the TDMA network
Take the composition.

Further, a wireless communication system which is an embodiment of the present invention is
A wireless communication system comprising a plurality of TDMA networks to which a wireless communication apparatus including a synchronization processing unit that performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication apparatus belongs.
When the synchronization processing unit of the wireless communication device receives a synchronization signal from another wireless communication device of another TDMA network that has a synchronization timing different from that of the TDMA network to which the own device belongs, based on the received synchronization signal, Change the synchronization timing of the TDMA network while maintaining the synchronization status in the TDMA network to which the own device belongs
Take the composition.

Further, a wireless communication method according to one aspect of the present invention is
A wireless communication method by a wireless communication apparatus which performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication apparatus,
When a wireless communication apparatus receives a synchronization signal from a wireless communication apparatus belonging to another TDMA network that has a synchronization timing different from that of the TDMA network to which the apparatus belongs, the TDMA to which the apparatus belongs belongs based on the received synchronization signal. Change the synchronization timing of the TDMA network while maintaining the synchronization status in the network
Take the composition.

  The present invention, configured as described above, can suppress disconnection of wireless communication between wireless communication devices in a TDMA network.

It is a figure which shows an example of the mode of the synchronous process by a TDMA network. It is a figure which shows the mode of the synchronous process by the TDMA network in this invention. It is a block diagram which shows the structure of the radio | wireless communication apparatus in this invention. 5 is a flowchart showing the operation of the wireless communication device disclosed in FIG. 3; FIG. 5 is a flowchart showing the details of the timing correction processing disclosed in FIG. 4 and is a diagram showing another operation example to be compared with the case of the present invention. FIG. 5 is a flowchart showing details of timing correction processing disclosed in FIG. 4 in the present invention. FIG. It is a block diagram which shows the structure of the radio | wireless communication apparatus in Additional remark 1 of this invention.

First Embodiment
The first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a diagram showing the state of synchronization processing in the entire wireless communication system. FIG. 3 is a block diagram showing the configuration of the wireless communication apparatus. 4 to 6 are flowcharts showing the operation of the wireless communication apparatus.

  A wireless communication apparatus according to the present invention performs TDMA synchronization processing with another wireless communication apparatus in a TDMA (Time Division Multiple Access) network to perform wireless communication. And in this invention, as shown in FIG. 2, the radio | wireless communications system provided with multiple TDMA networks 10 and 20 to which several wireless communication apparatuses 11-15 belong is comprised.

  Specifically, according to the present invention, as shown in FIG. 2, first, the TDMA networks 10 and 20 are separated into two TDMA networks 10 and 20 due to changes in the wireless environment (Case 1 to Case 2 in FIG. 2). Assume that the Thereafter, when the wireless environment changes again and wireless communication becomes possible from a part of each other's TDMA network (case 3 in FIG. 2), all wireless communication devices 11 to 15 return synchronization in the same TDMA network 30. Is possible (Case 4 in FIG. 1). That is, in the present invention, the disconnection of synchronization of a certain wireless communication terminal 15 is temporarily suppressed without passing through Case 4 of FIG. 2 described in the above-mentioned problem.

  However, the wireless communication system and device in the present invention are not necessarily limited to those in the situation shown in FIG. That is, the wireless communication system and device in the present invention are applicable to performing TDMA synchronization processing under any circumstances.

  Subsequently, configurations and operations of the wireless communication devices 11 to 15 will be described in detail. In addition, since all the wireless communication devices 11 to 15 have the same configuration, in the following, one wireless communication device 101 will be described as an example.

  The wireless communication device 101 is an information processing device capable of wireless communication, including a communication device, an arithmetic device, and a storage device. Then, as shown in FIG. 3, the wireless communication apparatus 101 includes an RF unit 104 and an antenna unit 105 as a communication apparatus. Further, the wireless communication device 101 includes a communication application processing unit 102 and a wireless control unit 103, which are constructed by execution of a program by an arithmetic device. The wireless control unit 103 further includes a TDMA synchronization processing unit 106, a modulation / demodulation processing unit 107, and an RF control unit 108.

  The function of each of the above configurations will be described along with the operation. In the TDMA network, it is necessary to establish TDMA synchronization with other wireless communication devices prior to transmission and reception of voice and data. The reception system will be described as an example. At an early stage, the TDMA synchronization processing unit 106 waits for reception of a synchronization signal, and the RF control unit 108 instructs the RF unit 104 to wait for reception.

  When the antenna unit 105 receives a radio signal transmitted from another wireless communication apparatus, the RF unit 104 performs an RF reception process, and the signal is transmitted to the radio control unit 103. In the wireless control unit 103, synchronization processing is performed in the TDMA synchronization processing unit 106, and after timing correction, TDMA synchronization is established.

  Thereafter, while performing the above-mentioned TDMA synchronization processing regularly, in transmission and reception of voice and data signals, a signal is transmitted from the RF unit 104 to the communication application processing unit 102 via the wireless control unit 103 to perform voice processing and the like. Implement data transfer.

  In the present invention, in particular, the internal processing of the TDMA synchronization processing unit 106 is characterized. Details of internal processing of the TDMA synchronization processing unit 106 (synchronization processing unit) will be described with reference to the flowcharts of FIGS. 4 to 6.

  First, the flow of the entire operation in the reception state will be described with reference to FIG. First, the process is started, and a reception waiting process (step S1) is performed. Then, the presence or absence of the reception of the synchronization signal is confirmed (step S2), and when the synchronization signal is not received, the reception is awaited again (No in step S2, step S1), and the timing correction process is performed when the synchronization signal is received. (Yes in step S2, step S3). Here, when a wireless communication apparatus belonging to a certain TDMA network receives a synchronization signal from another wireless communication apparatus belonging to another TDMA network having different synchronization timing, it is assumed that the timing correction process is performed.

  Subsequently, the routine processing of the timing correction processing (step S3) of FIG. 4 will be described for the case of the conventional method and the case of the method of the present invention.

  First, internal processing when the above-described timing correction process (step S3 in FIG. 4) is a conventional process will be described with reference to FIG. The process is started, and at the synchronization timing of another received TDMA network, the synchronization timing of the TDMA network to which the own device belongs is collectively shifted (step S11). After this processing, the process returns to the reception waiting (step S1) of FIG. 4 again. In this case, if the shift amount (change amount) of the synchronization timing is large, the synchronization timing may deviate from the synchronization in the TDMA network to which the wireless communication apparatus to which the synchronization timing has been shifted belongs, and communication may be disconnected.

  On the other hand, in the method of the present invention, the internal processing of the above-described timing correction processing (step S3 in FIG. 4) is performed as shown in FIG. A process is started, and a process (step S21) of storing timing detection and its timing is performed first. Next, timing is detected and it is confirmed whether a predetermined time has elapsed (step S22). If it has not elapsed, the process is ended (No in step S22), and the process returns to the process of FIG. 4 again. If a predetermined time has elapsed (Yes in step S22), synchronization is shifted (changed) based on the synchronization timing of the other wireless communication device acquired during that time and the synchronization timing of the TDMA network to which the own device belongs. A target value of timing is calculated (step S23).

  The target value is calculated, for example, by using the acquired synchronization timing of the other wireless communication apparatus as a target value or calculating a value intermediate between the two synchronization timings as a target value. At this time, the target value may be calculated by weighting both synchronization timings according to values unique to the other wireless communication apparatus that acquired synchronization timings and the own apparatus, for example, a MAC address. . For example, when the weight of another wireless communication apparatus is large according to a preset reference, the value of the synchronization timing acquired from the other wireless communication apparatus or a value close thereto is calculated as the target value.

  Subsequently, it is checked whether there is an error between the synchronization timing of the own apparatus and the target value (step S24). Here, the presence of an error means that the difference between the synchronization timing and the target value is equal to or greater than a preset threshold. If there is no error (No in step S24), the process ends and returns to the process of FIG. If there is an error (Yes in step S24), the synchronization timing is shifted (changed) (step S25).

  The shift of the synchronization timing described above is performed such that the synchronization timing approaches the target value while maintaining the synchronization state in the TDMA network to which the wireless communication apparatus belongs. At this time, the wireless communication apparatus shifts the synchronization timing by the maximum value capable of maintaining synchronization in the belonging TDMA network. For example, the shift amount is a value of guard time set in the TDMA network to which the wireless communication apparatus belongs. The guard time is an additional time for preventing overlapping in time due to an inevitable error in clock accuracy and a difference in propagation time between two or more devices in the TDMA network. Here, the shift amount of the synchronization timing may be any value equal to or less than the above-mentioned maximum value that can maintain synchronization or less than the guard time as long as the synchronization in the belonging TDMA network can be maintained. May be

  After shift processing of the synchronization timing described above (step S25), the processing returns to the processing of FIG. By repeating these processes, it is possible to gradually shift the synchronization timing to the target value within the range in which each TDMA network can maintain synchronization. As a result, the entire TDMA network can be synchronized to one timing without unexpected communication disconnection for the user.

  As described above, in the present invention, when a plurality of TDMA networks having different synchronization timings are combined, the target value of the synchronization timing is determined in each TDMA network, and the synchronization is maintained in each TDMA network before combination. The synchronization timing is repeatedly shifted to approach the target value. By this, it is possible to adjust to one timing in the entire TDMA network without breaking the synchronization. Further, in the calculation of the target value, it is possible to promote the early convergence of the calculation repeatedly by performing weighting with an arbitrary arbitrary value for each wireless communication apparatus. Further, it is not necessary to exchange information other than the synchronization signal between the plurality of wireless communication devices, and the synchronization processing can be performed in a distributed manner.

  Although the case where the wireless communication apparatus that has received the synchronization signal performs shift processing of the synchronization timing has been illustrated above, the side that has transmitted the synchronization signal may also receive the target value and perform shift processing of the synchronization timing. That is, in a plurality of TDMA networks, synchronization timing may be shifted in one TDMA network, or may be shifted in a plurality of TDMA networks.

<Supplementary Note>
Some or all of the above embodiments may be described as in the following appendices. The outline of the configurations of the wireless communication apparatus (see FIG. 7), the program, and the wireless communication method according to the present invention will be described below. However, the present invention is not limited to the following configuration.

(Supplementary Note 1)
A wireless communication apparatus 200 including a synchronization processing unit 201 that performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication apparatus,
When the synchronization processing unit 201 receives a synchronization signal from a wireless communication apparatus belonging to another TDMA network that has a synchronization timing different from that of the TDMA network to which the own apparatus belongs, the own apparatus uses the synchronization signal based on the received synchronization signal. Change the synchronization timing of the TDMA network while maintaining the synchronization status in the belonging TDMA network
Wireless communication device.

(Supplementary Note 2)
The wireless communication device according to appendix 1, wherein
The synchronization processing unit changes the synchronization timing of the TDMA network within the maximum amount that can maintain the synchronization state in the TDMA network to which the own device belongs.
Wireless communication device.

(Supplementary Note 3)
The wireless communication device according to appendix 1 or 2, wherein
The synchronization processing unit changes the synchronization timing of the TDMA network within a guard time set in wireless communication in the TDMA network to which the own device belongs.
Wireless communication device.

(Supplementary Note 4)
The wireless communication apparatus according to any one of appendices 1 to 3, wherein
The synchronization processing unit changes the synchronization timing of the TDMA network to which the own device belongs based on the synchronization timing of the TDMA network to which the own device belongs and the synchronization timing of the other TDMA network that receives the synchronization signal. To change the synchronization timing of the TDMA network while maintaining the synchronization state in the TDMA network to which the own apparatus belongs, so that the target value is approached.
Wireless communication device.

(Supplementary Note 5)
The wireless communication apparatus according to appendix 4, wherein
The synchronization processing unit is specific to the synchronization timing of the TDMA network to which the own apparatus belongs and the synchronization timing of the other TDMA network that has received the synchronization signal between the own apparatus and the wireless communication apparatus belonging to the other TDMA network. Setting the target value by weighting based on the value
Wireless communication device.

(Supplementary Note 6)
A wireless communication system comprising a plurality of TDMA networks to which a wireless communication apparatus including a synchronization processing unit that performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication apparatus belongs.
When the synchronization processing unit of the wireless communication device receives a synchronization signal from another wireless communication device of another TDMA network that has a synchronization timing different from that of the TDMA network to which the own device belongs, based on the received synchronization signal, Change the synchronization timing of the TDMA network while maintaining the synchronization status in the TDMA network to which the own device belongs
Wireless communication system.

(Appendix 7)
The wireless communication system according to appendix 1,
The synchronization processing unit of the wireless communication apparatus belonging to at least one TDMA network among the plurality of TDMA networks changes the synchronization timing of the TDMA network to which the own apparatus belongs.
Wireless communication system.

(Supplementary Note 8)
In the arithmetic device provided in the wireless communication device,
A program for realizing a synchronization processing unit that performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication device, comprising:
When the synchronization processing unit receives a synchronization signal from a wireless communication device belonging to another TDMA network that has a synchronization timing different from that of the TDMA network to which the own device belongs, the synchronization processing unit belongs to the own device based on the received synchronization signal. Change the synchronization timing of the TDMA network while maintaining the synchronization status in the TDMA network
program.

(Appendix 9)
A wireless communication method by a wireless communication apparatus which performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication apparatus,
When a wireless communication apparatus receives a synchronization signal from a wireless communication apparatus belonging to another TDMA network that has a synchronization timing different from that of the TDMA network to which the apparatus belongs, the TDMA to which the apparatus belongs belongs based on the received synchronization signal. Change the synchronization timing of the TDMA network while maintaining the synchronization status in the network
Wireless communication method.

(Supplementary Note 10)
The wireless communication method according to appendix 9, wherein
The wireless communication apparatus belonging to at least one TDMA network among a plurality of TDMA networks changes the synchronization timing of the TDMA network to which the own apparatus belongs.
Wireless communication method.

(Supplementary Note 11)
The wireless communication method according to appendix 10, wherein
The wireless communication apparatus changes the synchronization timing of the TDMA network within the maximum amount that can maintain the synchronization state in the TDMA network to which the wireless communication apparatus belongs.
Wireless communication method.

(Supplementary Note 12)
The wireless communication method according to appendix 10 or 11, wherein
The wireless communication apparatus changes the synchronization timing of the TDMA network within a guard time set in wireless communication in the TDMA network to which the wireless communication apparatus belongs.
Wireless communication method.

(Supplementary Note 13)
The wireless communication method according to any one of appendices 10 to 12, wherein
A target value for changing the synchronization timing of the TDMA network to which the wireless communication apparatus belongs based on the synchronization timing of the TDMA network to which the wireless communication apparatus belongs and the synchronization timing of the other TDMA network that received the synchronization signal. To change the synchronization timing of the TDMA network while maintaining the synchronization state in the TDMA network to which the own apparatus belongs, so that the target value is approached.
Wireless communication method.

(Supplementary Note 14)
The wireless communication method according to appendix 13, wherein
The wireless communication device is unique between the own device and the wireless communication device belonging to the other TDMA network, the synchronization timing of the TDMA network to which the own device belongs, and the synchronization timing of the other TDMA network receiving the synchronization signal. Setting the target value by weighting based on the value
Wireless communication method.

  The above-described program is stored in a storage device or recorded in a computer-readable recording medium. For example, the recording medium is a portable medium such as a flexible disk, an optical disk, a magneto-optical disk, and a semiconductor memory.

  As mentioned above, although this invention was demonstrated with reference to the said embodiment etc., this invention is not limited to embodiment mentioned above. Various modifications that can be understood by those skilled in the art within the scope of the present invention can be made to the configuration and details of the present invention.

10, 20, 30 TDMA networks 11 to 15 101 wireless communication device 102 communication application processing unit 103 wireless control unit 104 RF unit 105 antenna unit 106 TDMA synchronization processing unit 107 modulation / demodulation processing unit 108 RF control unit 200 wireless communication apparatus 201 synchronization processing Department

Claims (8)

A wireless communication apparatus comprising a synchronization processing unit that performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication apparatus, comprising:
When the synchronization processing unit receives a synchronization signal from a wireless communication apparatus belonging to another TDMA network that is a synchronization timing different from that of the TDMA network to which the apparatus itself belongs, synchronization timing and synchronization signal of the TDMA network to which the apparatus belongs The synchronization timing of the other TDMA network that has received the is weighted based on the unique value of the own apparatus and the wireless communication device belonging to the other TDMA network, and the target value of the synchronization timing of the entire TDMA network is set. Change the synchronization timing of the TDMA network while maintaining the synchronization state in the TDMA network to which the own device belongs so that the target value is approached .
Wireless communication device. The wireless communication device according to claim 1,
The synchronization processing unit changes the synchronization timing of the TDMA network within the maximum amount that can maintain the synchronization state in the TDMA network to which the own device belongs.
Wireless communication device. The wireless communication device according to claim 1 or 2,
The synchronization processing unit changes the synchronization timing of the TDMA network within a guard time set in wireless communication in the TDMA network to which the own device belongs.
Wireless communication device. A wireless communication system comprising a plurality of TDMA networks to which a wireless communication apparatus including a synchronization processing unit that performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication apparatus belongs.
When the synchronization processing unit of the wireless communication apparatus receives a synchronization signal from a wireless communication apparatus of another TDMA network that is different in synchronization timing from the TDMA network to which the own apparatus belongs, the synchronization timing of the TDMA network to which the own apparatus belongs And the synchronization timing of the other TDMA network that has received the synchronization signal based on the specific value of the own apparatus and the wireless communication device belonging to the other TDMA network, to obtain synchronization timing of the entire TDMA network. Set a target value, and change the synchronization timing of the TDMA network while maintaining the synchronization state in the TDMA network to which the own device belongs , so as to approach the target value .
Wireless communication system. The wireless communication system according to claim 4 ,
The synchronization processing unit of the wireless communication apparatus belonging to at least one TDMA network among the plurality of TDMA networks changes the synchronization timing of the TDMA network to which the own apparatus belongs.
Wireless communication system. In the arithmetic device provided in the wireless communication device,
A program for realizing a synchronization processing unit that performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication device, comprising:
When the synchronization processing unit receives a synchronization signal from a wireless communication apparatus belonging to another TDMA network that is a synchronization timing different from that of the TDMA network to which the apparatus itself belongs, synchronization timing and synchronization signal of the TDMA network to which the apparatus belongs The synchronization timing of the other TDMA network that has received the is weighted based on the unique value of the own apparatus and the wireless communication device belonging to the other TDMA network, and the target value of the synchronization timing of the entire TDMA network is set. Change the synchronization timing of the TDMA network while maintaining the synchronization state in the TDMA network to which the own device belongs so that the target value is approached .
program. A wireless communication method by a wireless communication apparatus which performs TDMA (Time Division Multiple Access) synchronization processing with another wireless communication apparatus,
When a wireless communication apparatus receives a synchronization signal from a wireless communication apparatus belonging to another TDMA network which is a synchronization timing different from the TDMA network to which the own apparatus belongs, the synchronization timing of the TDMA network to which the own apparatus belongs and the synchronization signal The target synchronization timing of the entire TDMA network is set by weighting the received synchronization timing of the other TDMA network based on the specific value of the own apparatus and the wireless communication apparatus belonging to the other TDMA network. And changing the synchronization timing of the TDMA network while maintaining the synchronization state in the TDMA network to which the own device belongs , so as to approach the target value .
Wireless communication method. The wireless communication method according to claim 7 ,
The wireless communication apparatus belonging to at least one TDMA network among a plurality of TDMA networks changes the synchronization timing of the TDMA network to which the own apparatus belongs.
Wireless communication method.

Images