JP5034121B2 - Wireless communication apparatus and diversity control method - Google Patents

Description

  The present invention relates to a wireless communication apparatus having a selection diversity function for selecting a signal used for communication processing from signals received by a plurality of antennas.

  The selective diversity function that preferentially uses antenna signals with excellent radio wave conditions for the same radio signal received by multiple antennas is inexpensive and easy to control, so it is incorporated into wireless communication devices (base stations and mobile stations) It has been.

  PHS (Personal Handyphone System) communication is characterized by the fact that the transmission and reception frequencies are the same and the timing (2.5 ms) is short, so the antenna selected by the diversity function at the time of reception is considered effective at the time of transmission. The transmission antenna is switched simultaneously with the reception antenna.

  However, when the base station and the mobile station implement the selection diversity function with the same performance, antenna switching is performed at the same timing as shown in FIG. 10, and the communication quality may not be improved.

  Switching antennas that does not lead to improved communication quality not only imposes a load on processing, but also increases power consumption.

  In order to prevent the base station and the mobile station from switching antennas at the same timing, either the base station or the mobile station can stop the diversity function or change the switching timing. It is difficult to change the switching timing unless the stations are unified with products of the same manufacturer. In other words, since the diversity functions of base stations and mobile stations are different for each manufacturer and are not unified, in a communication system in which products (base stations / mobile stations) of a plurality of manufacturers are mixed, the base station and the mobile station are the same. It was difficult to prevent switching antennas at the timing.

  As a technique related to selection diversity, there is a “wireless communication terminal and wireless communication method” disclosed in Patent Document 1.

JP 2008-167079 A

  However, although the invention disclosed in Patent Document 1 selectively uses two antennas for reception, antenna selection is not performed for transmission. Therefore, it cannot be applied to a communication system such as PHS that shares an antenna for transmission and reception.

  The present invention has been made in view of such a problem, and uses the same frequency for transmission / reception, performs communication by switching transmission / reception at a predetermined period, and selects diversity antennas used for communication from a plurality of antennas. It is an object of the present invention to provide a radio communication apparatus and a diversity control method that have a function and prevent the switching of an antenna at the same timing as that of a communication counterpart apparatus.

In order to achieve the above object, the present invention provides, as a first aspect, a wireless communication apparatus of a communication system that uses the same frequency for transmission and reception and switches between transmission and reception at a predetermined cycle. selects an antenna used for communication, a selection diversity function for communicating with the antenna in which the selected, have a means for transmitting diversity information indicating the specifications of the selected diversity function of the apparatus to the communication partner device, the selection The diversity function includes a communication function for notifying that the communication quality has deteriorated when the communication quality is reduced, and an antenna switching function for switching the antenna used for communication when the communication function is notified that the communication quality has been reduced. It is an object of the present invention to provide a wireless communication device characterized by having a wireless communication device.

In order to achieve the above object, the present invention provides, as a second aspect, a wireless communication apparatus of a communication system that uses the same frequency for transmission and reception and switches between transmission and reception at a predetermined cycle.
A selection diversity function for selecting an antenna to be used for communication from among a plurality of antennas and communicating using the selected antenna is provided, and information indicating the specification of the selection diversity function of the communication counterpart device is provided from the communication counterpart device. When it is received, it is determined whether or not it matches the specification of the selection diversity function of the own device, and if it matches, the selection diversity function of the own device is stopped or the antenna switching timing by the selection diversity function is predetermined. The present invention provides a wireless communication apparatus characterized in that the timing is changed to a timing different from the above timing.

  In order to achieve the above object, the present invention provides, as a third aspect, a selection diversity function for selecting an antenna to be used for communication from a plurality of antennas and performing communication using the selected antenna, A diversity control method in a wireless communication device of a communication system that uses the same frequency for transmission and reception and switches between transmission and reception at a predetermined cycle, and represents the specification of the selection diversity function of the communication counterpart device from the communication counterpart device to the radio communication device When the information is received, it is judged whether or not it matches the specification of the selection diversity function of the own device, and when it matches, the selection diversity function of the own device is stopped or the antenna switching timing by the selection diversity function Diversity characterized by changing to a timing different from the predetermined timing It is to provide a control method.

  According to the present invention, the same frequency is used for transmission and reception, communication is performed by switching between transmission and reception at a predetermined cycle, and a selection diversity function for selecting an antenna to be used for communication from a plurality of antennas is provided. It is possible to provide a radio communication apparatus and a diversity control method that prevent the switching of antennas at the same timing.

It is a figure which shows the structure of the radio | wireless communication apparatus which concerns on this invention. It is a figure which shows the structure of the radio | wireless communication apparatus which concerns on this invention. It is a figure which shows the structure of the PHS communication system which concerns on 1st Embodiment which implemented this invention suitably. It is a figure which shows the structure of the base station which concerns on 1st Embodiment. It is a figure which shows the example of a data structure of PCH which added diversity information. It is a figure which shows the structure of the mobile station which concerns on 1st Embodiment. It is a figure which shows the structure of the PHS communication system which concerns on 2nd Embodiment which implemented this invention suitably. It is a figure which shows the structure of the base station which concerns on 2nd Embodiment. It is a figure which shows the structure of the mobile station which concerns on 2nd Embodiment. It is a figure which shows the state by which the improvement of communication quality was not seen because both the base station and the mobile station switched the antenna by the selection diversity function at the same timing.

As shown in FIG. 1, a wireless communication apparatus 100 according to the present invention is a communication method that uses the same frequency for transmission and reception and switches transmission and reception at a predetermined cycle. A diversity control unit 107 that selects an antenna to be used, a communication unit 103 using the antenna selected by the diversity control unit 107, and a diversity information storage unit 106 that stores diversity information indicating the specifications of the selection diversity function of the device itself; And a diversity information transmitting unit 105 that transmits diversity information to a communication partner apparatus.
By adopting such a configuration, the communication partner device can be notified of the specifications of the selection diversity function of the own device, so that the communication partner device can determine whether or not inconvenience occurs when the selection diversity function is used.

As shown in FIG. 2, the wireless communication apparatus 200 according to the present invention is a communication method that uses the same frequency for transmission and reception and switches transmission and reception at a predetermined cycle. From among a plurality of antennas 201 and 202, A diversity control unit 208 that selects an antenna to be used for communication, a communication unit 203 using the antenna selected by the diversity control unit 208, and a diversity information storage unit 207 that stores diversity information indicating the specifications of the selection diversity function of the own device. Based on the diversity information received from the communication partner device, it is determined whether or not the specifications of the selected diversity function match between the communication partner device and the own device. If they match, the selection diversity function of the own device is stopped. Or antenna switching with selective diversity function The and a diversity information comparing unit 206 to change to a different timing from the predetermined timing.
With this configuration, when the communication partner device has the same selection diversity function as that of its own device, the diversity function can be stopped or the antenna switching timing can be changed. Therefore, communication is performed when the selection diversity function is executed. The antenna is switched at the same timing as the counterpart device, and communication quality is not improved.

  Hereinafter, preferred embodiments of the wireless communication apparatus according to the present invention will be described.

[First Embodiment]
FIG. 3 shows a configuration of a PHS communication system according to a preferred embodiment of the present invention. The PHS communication system includes a base station 10 and a mobile station 20, and each station has a selection diversity function that selectively uses two antennas. Although only one mobile station 20 is shown in the figure, the base station 10 actually performs one-to-many communication with an unspecified number of mobile stations 20.

FIG. 4 shows the configuration of the base station 10. The base station 10 includes antennas 11 and 12, a communication unit 13, a data processing unit 14, a diversity information addition unit 15, a diversity information storage unit 16, and a diversity control unit 17.
The antennas 11 and 12 are selectively used for communication with the mobile station 20. One of the antennas 11 and 12 selected for use in communication is shared for transmission and reception. The communication unit 13 outputs data to the mobile station 20 and acquires data from the mobile station 20 via the antenna 11 or 12 selected for use for communication. Moreover, the communication part 13 notifies that to the diversity control part 17, when communication quality falls. The data processing unit 14 processes data acquired from the mobile station 20 and generates data to be output to the mobile station 20. The diversity information adding unit 15 adds the diversity information stored in the diversity information storage unit 16 to a general call channel (PCH: Paging Channel). FIG. 5 shows an example of the data structure of PCH to which diversity information is added. The diversity information storage unit 16 stores information indicating the selection diversity specifications of the own station. The diversity control unit 17 switches the antenna used by the communication unit 13 for communication with the mobile station 20 when notified from the communication unit 13 that the communication quality has deteriorated.

FIG. 6 shows the configuration of the mobile station 20. The mobile station 20 includes antennas 21 and 22, a communication unit 23, a data processing unit 24, a diversity information extraction unit 25, a diversity information comparison unit 26, a diversity information storage unit 27, and a diversity control unit 28.
The antennas 21 and 22 are selectively used for communication with the base station 10. One of the antennas 21 and 22 selected for communication is shared for transmission and reception. The communication unit 23 outputs data to the base station 10 via the antenna 21 or 22 selected for use for communication, and acquires data from the base station 10. Further, when the communication quality is deteriorated, the communication unit 23 notifies the diversity control unit 28 to that effect. The data processing unit 24 processes data acquired from the base station 10 and generates data to be output to the base station 10. The diversity information extraction unit 25 extracts diversity information of the base station 10 added to the PCH received from the base station 10. The diversity information comparison unit 26 determines whether or not the diversity information of the base station 10 extracted by the diversity information extraction unit 25 matches the diversity information of the own station stored in the diversity information storage unit 27. Diversity control unit 28 switches the antenna used by communication unit 23 for communication with base station 10 when notified from communication unit 23 that the communication quality has deteriorated. However, when the diversity information comparison unit 26 notifies that the diversity information matches, the antenna is not switched even if the communication unit 23 notifies that the communication quality has deteriorated.

FIG. 7 shows the operation of the communication system according to the present embodiment.
The base station transmits a PCH (Batch Call Channel) including the diversity information of the own station. When a nearby mobile station receives PCH including diversity information of a base station, it compares with the diversity function of its own station and determines whether or not the performance is the same. In the case of the same performance, the mobile station stops the diversity function.

  When a mobile station that has stopped the diversity function moves to a cell of another base station or receives a PCH that includes diversity with a specification different from that of the own station or a PCH that does not include diversity information, the diversity function is activated. .

  Here, the diversity function is stopped when the diversity function has the same performance, but the antenna switching timing may be changed. In this case, the antenna switching timing may be returned to a predetermined timing when a PCH including diversity of specifications different from that of the own station or a PCH not including diversity information is received.

  As described above, in the PHS communication system according to the present embodiment, the base station and the mobile station do not switch antennas at the same timing. Therefore, when the base station switches antennas by performing selection diversity, communication is performed. The possibility that quality does not improve can be reduced.

[Second Embodiment]
A second embodiment in which the present invention is suitably implemented will be described.
The PHS communication system according to the present embodiment includes a base station 30 and a mobile station 40 as in the first embodiment, and each station has a selection diversity function that selectively uses two antennas. .

FIG. 8 shows the configuration of the base station 30. The base station 30 includes antennas 31 and 32, a communication unit 33, a data processing unit 34, a diversity information extraction unit 35, a diversity information comparison unit 36, a diversity information storage unit 37, and a diversity control unit 38.
The antennas 31 and 32 are selectively used for communication with the mobile station 40. The antenna 31 or 32 that is selected for use in communication is shared for transmission and reception. The communication unit 33 outputs data to the mobile station 40 via the antenna 31 or 32 selected to be used for communication, and acquires data from the mobile station 40. Further, when the communication quality is deteriorated, the communication unit 33 notifies the diversity control unit 38 to that effect. The data processing unit 34 processes data acquired from the mobile station 40 and generates data to be output to the mobile station 40. The diversity information extraction unit 35 extracts diversity information of the mobile station 40 added to a dedicated channel (DCH: Dedicated Channel) received from the mobile station 40. The diversity information comparison unit 36 determines whether the diversity information of the mobile station 40 extracted by the diversity information extraction unit 35 matches the diversity information of the own station stored in the diversity information storage unit 37. The diversity control unit 38 switches the antenna used by the communication unit 33 for communication with the mobile station 40 when notified from the communication unit 33 that the communication quality has deteriorated. However, when the diversity information comparison unit 36 notifies that the diversity information matches, the antenna is not switched even if the communication unit 33 notifies that the communication quality has deteriorated.

FIG. 9 shows the configuration of the mobile station 40. The mobile station 40 includes antennas 41 and 42, a communication unit 43, a data processing unit 44, a diversity information addition unit 45, a diversity information storage unit 46, and a diversity control unit 47.
The antennas 41 and 42 are selectively used for communication with the base station 30. The antenna 41 or 42 that is selected for use in communication is shared for transmission and reception. The communication unit 43 outputs data to the base station 30 and acquires data from the base station 30 via the antenna 41, 42 selected for use for communication. Further, when the communication quality is deteriorated, the communication unit 43 notifies the diversity control unit 47 to that effect. The data processing unit 44 processes data acquired from the base station 30 and generates data to be output to the base station 30. The diversity information adding unit 45 adds the diversity information stored in the diversity information storage unit 46 to the dedicated channel DCH. The diversity information storage unit 46 stores information indicating the specifications of the selection diversity of the own station. The diversity control unit 47 switches the antenna used by the communication unit 43 for communication with the base station 30 when notified from the communication unit 43 that the communication quality has deteriorated.

  In this embodiment, the base station 30 side stops / activates the diversity function according to the diversity information notified from the mobile station 40. The diversity function stop / start flow is the same as in the first embodiment.

As described above, since the base station 30 actually communicates with an unspecified number of mobile stations 40, when all of the mobile stations 40 that are communication partners have the same diversity function, only a part of the base station 30 has the same diversity function. In this case, there are three possible system configurations in which only one has the same diversity function.
Therefore, in order to ensure communication quality with the mobile stations 40 having different diversity functions, it is preferable that the base station 30 stops the diversity function when all the mobile stations 40 as communication partners have the same diversity function. However, the base station 30 is not limited to this, and the base station 30 has a case where at least one of the mobile stations 40 has the same diversity function, or a case where the ratio of the mobile stations 40 having the same diversity function is larger than a predetermined ratio ( For example, the diversity function may be stopped in a majority).

  Further, the antenna switching timing may be changed. In this case, the antenna switching timing may be returned to a predetermined timing when a DCH including diversity of specifications different from that of the own station or a DCH not including diversity information is received.

  As described above, in the PHS communication system according to the present embodiment, the base station and the mobile station do not switch antennas at the same timing. Therefore, when the base station switches antennas by performing selection diversity, communication is performed. The possibility that quality does not improve can be reduced.

In addition, the said embodiment is an example of suitable implementation of this invention, and this invention is not limited to this.
For example, in each of the above embodiments, the PHS wireless communication system is taken as an example, but the present invention can also be applied to any wireless communication system having the same transmission / reception frequency and short timing.
In each of the above embodiments, the base station and the mobile station have an example of a configuration having a selection diversity function in which one of the two antennas is selectively used. One may be selectively used to realize the selection diversity function.
As described above, the present invention can be variously modified.

10, 30 Base station 11, 12, 21, 22, 31, 32, 41, 42, 101, 102, 201, 202 Antenna 13, 23, 33, 43, 103, 203 Communication unit 14, 24, 34, 44 Data Processing unit 15, 45 Diversity information addition unit 16, 27, 37, 46, 106, 207 Diversity information storage unit 17, 28, 38, 47, 107, 208 Diversity control unit 20, 40 Mobile station 25, 35, Diversity information extraction Units 26, 36, 206 Diversity information comparison unit 100, 200 Wireless communication device 105 Diversity information transmission unit

Claims (11)

A wireless communication device of a communication method that uses the same frequency for transmission and reception and switches transmission and reception at a predetermined cycle,
A selection diversity function for selecting an antenna to be used for communication from a plurality of antennas and performing communication using the selected antenna is provided.
Means for transmitting diversity information representing the specifications of the selected diversity function of the own device to a communication partner device;
The selection diversity function is
A communication function for notifying that the communication quality has deteriorated when the communication quality has deteriorated;
Antenna possess an antenna switching function for switching the used for communication when the communication quality from the communication function is notified of the reduction,
The means causes the communication partner device to determine whether or not the specification of the selected diversity function of the own device matches the specification of the selected diversity function of the communication partner device by transmitting the diversity information. In this case, the selection diversity function of the communication counterpart device is stopped, or the antenna switching timing by the selection diversity function of the communication counterpart device is changed to a timing different from a predetermined timing.
A wireless communication apparatus.
  The radio communication apparatus according to claim 1, wherein the radio communication apparatus is a PHS base station connected to an exchange station, and communicates with an unspecified number of PHS mobile stations which are the communication counterpart apparatuses.   The radio communication apparatus according to claim 2, wherein the diversity information is transmitted by broadcast to an unspecified number of the PHS mobile stations.   The wireless communication apparatus according to claim 3, wherein the diversity information is transmitted by being included in a general call channel.   2. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is a PHS mobile station that uses a PHS base station connected to an exchange station as the communication partner apparatus.   6. The wireless communication apparatus according to claim 5, wherein the diversity information is transmitted by being included in a response to the general call channel from the PHS base station. A wireless communication device of a communication method that uses the same frequency for transmission and reception and switches transmission and reception at a predetermined cycle,
A selection diversity function for selecting an antenna to be used for communication from a plurality of antennas and performing communication using the selected antenna is provided.
When information representing the specification of the selected diversity function of the communication partner device is received from the communication partner device, it is determined whether or not it matches the specification of the selection diversity function of the own device. A radio communication apparatus characterized in that the selection diversity function of the apparatus is stopped or the antenna switching timing by the selection diversity function is changed to a timing different from a predetermined timing.   When the diversity information is received from a plurality of communication counterpart devices, it is determined whether the specifications of the selection diversity function match for all the communication counterparts, and if all match, the selection diversity function of the own device The radio communication apparatus according to claim 7, wherein the antenna switching timing is changed to a timing different from a predetermined timing by the selection diversity function.   When the diversity information is received from a plurality of the communication partner devices, it is determined whether or not the specifications of the selection diversity function match for all of the communication partner, and the selection of the own device when at least one matches 8. The wireless communication apparatus according to claim 7, wherein the diversity function is stopped, or the antenna switching timing by the selection diversity function is changed to a timing different from a predetermined timing.   When the diversity information is received from a plurality of the communication partner devices, it is determined whether or not the specifications of the selected diversity function match for all the communication partners, and the ratio of the matching communication partner devices is equal to or greater than a predetermined ratio 8. The wireless communication according to claim 7, wherein the selection diversity function of the own apparatus is stopped in the case of the above, or the switching timing of the antenna by the selection diversity function is changed to a timing different from a predetermined timing. apparatus. A wireless communication system that has a selection diversity function for selecting an antenna to be used for communication from a plurality of antennas, and that uses the selected antenna for communication, and uses the same frequency for transmission and reception and switches between transmission and reception at a predetermined cycle. A diversity control method in a communication device,
When the wireless communication device receives information indicating the specification of the selected diversity function of the communication partner device from the communication partner device, the wireless communication device determines whether or not it matches the specification of the selection diversity function of the own device. In this case, the diversity control method is characterized in that the selection diversity function of the own apparatus is stopped or the antenna switching timing by the selection diversity function is changed to a timing different from a predetermined timing.

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