JP2011182296A - Radio communication system, method of setting base station search term and radio base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication system capable of optimizing radio traffic as a whole. <P>SOLUTION: The present invention relates to a radio communication system 1 that a radio terminal 4 transmits a base station search signal and a base station for connection is selected from a plurality of radio base stations 2, 3. In the radio communication system, the radio base station 2 selected as the base station for connection determines a term for base station search of the radio terminal 4 and/or the timing to transmit the base station search signal on the basis of its own base station status and transmits the determined term and/or transmission timing to the radio terminal 4. Furthermore, the radio base station 2 selected as the base station for connection receives a signal indicating a terminal status from the radio terminal 4 and is allowed to determine the term for base station search of the radio terminal 4 and/or the transmission timing of the base station search signal on the basis of the received terminal status and its own base station status. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radio communication system, a base station search cycle setting method, and a radio base station, and more particularly to a system for determining a base station search cycle and a search timing of a radio terminal.

  In general, a mobile communication terminal such as a mobile phone is configured to search a base station having a good communication state from a plurality of radio base stations and maintain a sufficient communication capability. In such a mobile communication terminal, the base station search is performed periodically, and when the reception level is lowered by moving away from the connected base station or the like, the base station operates appropriately.

  At that time, it is preferable to shorten the base station search cycle from the viewpoint of the communication state. However, in the search operation, it is necessary to drive the reception detection circuit and the control unit in the terminal. This will cause an increase in the operating period of the terminal.

  Therefore, for example, as described in Patent Document 1, a wireless communication terminal that changes the base station search period in accordance with an increasing / decreasing tendency of the reception level has been proposed, and for example, the reception level of the wireless terminal device tends to increase. In some cases, the base station is estimated to be approaching the service area of the base station, and the base station search cycle is returned to the normal short cycle to increase the reception performance.

  Further, Patent Document 2 refers to an incoming call history recording unit for recording an incoming call history, and a past incoming call history that is traced back from the time when it is determined that the base station is out of the service area, and the base station search cycle is set accordingly. There has been proposed a wireless communication terminal including a search cycle determination unit to be changed. When the frequency of incoming calls is low, this wireless communication terminal performs base station searches with a long period with an emphasis on power saving performance. Conversely, when the frequency of incoming calls is high, this wireless communication terminal ensures high reception capability. The base station search is implemented with a short period with emphasis.

JP 2006-140912 A JP 2008-160303 A

  However, in each of the wireless communication terminals described in Patent Documents 1 and 2, since the terminal itself determines the base station search cycle, and the base station search signal is transmitted to the base station according to the cycle, a plurality of base station search signals are provided. In this case, each terminal determines a search cycle. For this reason, cooperation between wireless terminals cannot be achieved, and it has been difficult to optimize wireless traffic as the entire system.

  Therefore, the present invention has been made in view of the problems in the above-described conventional technology, and an object thereof is to provide a wireless communication system and the like that can optimize wireless traffic as the entire system. .

  To achieve the above object, the present invention provides a wireless communication system in which a wireless terminal transmits a base station search signal and selects a connection base station from a plurality of wireless base stations, The selected radio base station determines the base station search period and / or the base station search signal transmission timing of the radio terminal based on its base station state, and the determined period and / or transmission timing is determined. It transmits to a wireless terminal, It is characterized by the above-mentioned.

  According to the present invention, since the radio base station determines the base station search period of the radio terminal based on the base station state, it is possible to coordinate between the radio terminals, and the radio traffic as the entire system Can be optimized.

  In the wireless communication system, a wireless base station selected as the connection base station receives a signal indicating a terminal state from the wireless terminal, and based on the received terminal state and the own base station state The base station search cycle of the wireless terminal and / or the transmission timing of the base station search signal can be determined. According to this, in addition to being able to coordinate between wireless terminals, it becomes possible to perform traffic adjustment according to the situation of the wireless terminals.

  In the wireless communication system, a wireless base station selected as the connection base station receives a signal indicating the terminal state from a plurality of wireless terminals, and the received terminal state of the plurality of wireless terminals and the own terminal The base station search cycle and / or base station search signal transmission timing of the wireless terminal can be determined based on the base station state. According to this, in addition to being able to coordinate between wireless terminals, it becomes possible to adjust traffic according to the situation of each wireless terminal.

  In the above wireless communication system, each of the plurality of wireless base stations is communicably connected to each other, and the wireless base station selected as the connection base station indicates the state of the base station from another wireless base station. Obtaining a signal and determining a base station search period and / or a base station search signal transmission timing of the wireless terminal based on a base station state of the other radio base station and the base station state of the base station. it can. According to this, in addition to being able to coordinate between wireless terminals, it becomes possible to adjust traffic according to the situation of each wireless base station.

  In the wireless communication system, the base station state is information including a connection state with another wireless terminal (a terminal other than a wireless terminal for which a base station search period and / or a base station search signal transmission timing is determined). It can be.

  In the wireless communication system, the terminal state may be information including at least one of a battery remaining amount, a moving speed, and a connection priority of the wireless terminal.

  In addition, the present invention provides a method for setting a base station search period of a radio terminal in a radio communication system in which a radio terminal transmits a base station search signal and selects a base station for connection from a plurality of radio base stations. The radio base station selected as the base station for connection determines a base station search cycle and / or a base station search signal transmission timing of the radio terminal based on its own base station state; The determined period and / or transmission timing is transmitted to the wireless terminal.

  Furthermore, the present invention returns a response signal to the wireless terminal in response to receiving a base station search signal transmitted from the wireless terminal, and functions as a connection base station in response to a request from the wireless terminal A base station search cycle and / or a base station search signal transmission timing based on the state of the base station when the base station is selected as the connection base station. The determined period and / or transmission timing is transmitted to the wireless terminal.

  As described above, according to the present invention, it is possible to provide a wireless communication system or the like that can optimize wireless traffic as the entire system.

It is a block diagram which shows 1st Embodiment of the radio | wireless communications system concerning this invention. FIG. 2 is a block diagram showing a configuration of a radio base station in FIG. 1. It is a block diagram which shows the structure of the radio | wireless terminal of FIG. It is a sequence diagram which shows operation | movement of the radio | wireless communications system concerning 1st Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system concerning 2nd Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system concerning 3rd Embodiment. It is a sequence diagram which shows operation | movement of the radio | wireless communications system concerning 4th Embodiment.

  Next, modes for carrying out the invention will be described in detail with reference to the drawings. Here, a case where the wireless communication system according to the present invention is applied to a position management system that manages the position of an article or the like using a wireless tag will be described as an example.

  FIG. 1 shows a first embodiment of a wireless communication system according to the present invention. The wireless communication system 1 is roughly divided into a plurality of wireless base stations 2 and 3 connected to each other by a wired connection (solid lines), and wireless communication. A plurality of wireless terminals (wireless tags) 4 and 5 that are wirelessly connected (broken lines) to the base stations 2 and 3 are configured.

  Although not shown in the figure, the wireless base stations 2 and 3 are connected to a device for detecting and managing the position of an article or the like based on the received signals from the wireless terminals 4 and 5. Further, for convenience of explanation, two radio base stations and two radio terminals are provided, but the number of these may be three or more.

  The radio base stations 2 and 3 are provided for receiving radio waves from the radio terminals 4 and 5, and both have the same configuration. As shown in FIG. 2, these radio base stations 2 and 3 have a radio transmission / reception unit 11 that performs data transmission / reception processing by radio communication with the radio terminals 4 and 5, as shown in FIG. The wired transmission / reception unit 12 that performs data transmission / reception processing by wired communication with the wireless base station and the state of the own base station, and status information transmitted from the other wireless base stations and the wireless terminals 4 and 5 A state management unit 13 to be managed, a wireless transmission / reception unit 11, a wired transmission / reception unit 12, and a state management unit 13 are provided with a calculation unit 14 that exchanges data and performs calculation processing based on the data.

  The wireless terminals 4 and 5 are wireless tags attached to a transported article or the like, and are mobile communication terminals that move along with the article or the like. These wireless terminals 4 and 5 are configured to periodically issue a base station search signal in order to search for a base station suitable for wireless communication, and both have the same configuration.

  As shown in FIG. 3, the wireless terminals 4 and 5 have a wireless transmission / reception unit 21 that performs data transmission / reception processing by wireless communication with the wireless base station 2 or the wireless base station 3, as shown in FIG. A state management unit 22 that manages the state of the terminal itself, a wireless transmission / reception unit 21, and a state management unit 22 are provided with a calculation unit 23 that exchanges data and performs calculation processing based on the data.

  Next, in the wireless communication system 1 having the above configuration, an operation when determining the base station search period of the wireless terminal 4 will be described with reference to FIG.

  First, the wireless terminal 4 transmits a base station search signal to each of the wireless base stations 2 and 3 to perform a base station search (steps S1 and S2). Next, each of the radio base stations 2 and 3 returns a response signal to the radio terminal 4 in response to the base station search signal from the radio terminal 4 (steps S3 and S4).

  Next, the computing unit 23 of the wireless terminal 4 selects a base station suitable for its own wireless communication (for example, a base station with higher radio field intensity during communication) from the wireless base stations 2 and 3 and relays it. The base station to be connected is determined (step S5). At this time, for example, if the wireless base station 2 is selected as the base station for connection, the wireless terminal 4 transmits a connection notification to the wireless base station 2 and requests connection processing (step S6).

  When the wireless base station 2 receives the connection notification from the wireless terminal 4, the wireless base station 2 transmits its own base station state managed by the state management unit 13 to the calculation unit 14 (step S7). Here, the base station state includes a connection state with a terminal other than the wireless terminal 4 (which terminal other than the wireless terminal 4 is connected to, a base station search cycle of the wireless terminal, Information indicating the transmission timing of the base station search signal).

  Then, the calculation unit 14 determines the base station search cycle of the radio terminal 4 and the transmission timing of the base station search signal based on the acquired base station state of the radio base station 2 (step S8). For example, the wireless base station 2 is in a state of being connected to the wireless terminal 5 as a terminal other than the wireless terminal 4, the transmission timing of the base station search signal from the wireless terminal 5, and the base station search from the wireless terminal 4 When there is a possibility that the transmission timing of the signal competes, the base station search cycle of the wireless terminal 4 is expanded or adjusted, and the transmission timing of the base station search signal is changed so that the two do not compete with each other.

  When the search cycle and transmission timing are determined as described above, the radio base station 2 transmits the determined search cycle and the like to the radio terminal 4 together with a response signal to the connection notification (step S9). Then, the wireless terminal 4 sets the search period received from the wireless base station 2 in the state management unit 22, and thereafter searches for the wireless base station at the set periodic interval and transmission timing (step S10). .

  Thus, according to the present embodiment, the radio base station 2 has a base station state including a connection state with other radio terminals, and based on this, the base station search cycle of the radio terminal 4 is determined. Therefore, the wireless terminals can be coordinated with each other, and the wireless traffic of the entire system can be optimized.

  Next, a second embodiment of the wireless communication system according to the present invention will be described with reference to FIG. The system configuration is the same as that of the first embodiment, as shown in FIGS. Here, a case where the base station search period of the wireless terminal 4 is determined will be described as an example.

  In determining the search cycle, first, the radio terminal 4 transmits a base station search signal to each of the radio base stations 2 and 3 to perform a base station search (steps S11 and S12). Next, each of the wireless base stations 2 and 3 returns a response signal to the wireless terminal 4 in response to the base station search signal from the wireless terminal 4 (steps S13 and S14).

  Next, the computing unit 23 of the wireless terminal 4 selects a base station suitable for its own wireless communication from the wireless base stations 2 and 3 and determines it as a connection base station (step S15). At the same time, the terminal state of the terminal such as the remaining battery level, the moving speed, and the connection priority is acquired from the state management unit 13 (step S16).

  If the wireless base station 2 is selected as a connection base station in the previous step S15, the wireless terminal 4 transmits a connection notification and a terminal state to the wireless base station 2 and requests a connection process (step S15). S17).

  When receiving the connection notification and the terminal state from the wireless terminal 4, the wireless base station 2 transmits the base station state of the wireless base station 2 managed by the state management unit 13 to the calculation unit 14 (step S18). Next, the calculation unit 14 determines a base station search cycle and the like based on the base station state of itself and the terminal state from the wireless terminal 4 (step S19).

  In determining the base station search period and the like, the base station state is used as an index for coordinating the base station search between the wireless terminal 4 and other wireless terminals, as in the first embodiment. . On the other hand, if the terminal state refers to, for example, the remaining battery level, it is used as an index for power saving of the wireless terminal 4, and when the remaining battery level of the wireless terminal 4 is low, the base station of the wireless terminal 4 Adjust the search period to be longer. Further, when referring to the moving speed and the connection priority, the terminal state is used as an index for ensuring high communication capability, and the base station is used when the moving speed of the wireless terminal 4 is fast or the connection priority is high. Adjust the station search cycle to be shorter.

  When the search cycle or the like is determined as described above, the radio base station 2 transmits the determined search cycle to the radio terminal 4 together with a response signal to the connection notification (step S20). Thereafter, the wireless terminal 4 sets the search period received from the wireless base station 2 in the state management unit 22, and thereafter searches for the wireless base station at the set periodic interval and transmission timing (step S21). .

  Thus, according to the present embodiment, in order to determine the base station search cycle and the like in consideration of the terminal state of the wireless terminal 4, in addition to being able to achieve cooperation between wireless terminals, the wireless terminal It becomes possible to adjust traffic according to the situation of 4.

  Next, a third embodiment of the wireless communication system according to the present invention will be described with reference to FIG. The system configuration is the same as that of the first embodiment, as shown in FIGS. Here, a case where the base station search cycle of the wireless terminal 4 is determined after the base station search cycle of the wireless terminal 4 is determined will be described as an example.

  First, the wireless terminal 4 transmits a base station search signal to each of the wireless base stations 2 and 3 to perform a base station search (steps S31 and S32). Next, each of the wireless base stations 2 and 3 returns a response signal to the wireless terminal 4 in response to the base station search signal from the wireless terminal 4 (steps S33 and S34).

  Next, the computing unit 23 of the wireless terminal 4 selects a base station suitable for its own wireless communication from the wireless base stations 2 and 3 and determines it as a connection base station (step S35). At the same time, the terminal state of the terminal such as the remaining battery level is acquired from the state management unit 13 (step S36).

  If the wireless base station 2 is selected as a connection base station in the previous step S35, the wireless terminal 4 transmits a connection notification and a terminal state to the wireless base station 2 and requests a connection process (step S35). S37).

  When the wireless base station 2 receives the connection notification and the terminal state from the wireless terminal 4, the wireless base station 2 stores the received terminal state in the state management unit 13 (step S38), and the wireless base station 2 managed by the state management unit 13 A state is transmitted to the calculating part 14 (step S39). Next, the calculation unit 14 determines a base station search period and the like based on the base station state of itself and the terminal state of the wireless terminal 4 (step S40). The method for determining the cycle and the like at this time is the same as in the case of the second embodiment.

  When the search cycle and the like are determined, the radio base station 2 transmits the determined search cycle and the like to the radio terminal 4 together with a response signal to the connection notification (step S41). Thereafter, the wireless terminal 4 sets the search period received from the wireless base station 2 in the state management unit 22, and thereafter searches for the wireless base station at the set periodic interval and transmission timing (step S42). .

  Next, when the wireless terminal 5 transmits a base station search signal to each of the wireless base stations 2 and 3 (steps S43 and S44), each of the wireless base stations 2 and 3 searches for the base station from the wireless terminal 5. In response to the signal, a response signal is returned to the wireless terminal 5 (steps S45 and S46).

  Next, the computing unit 23 of the wireless terminal 5 selects a base station suitable for its own wireless communication from the wireless base stations 2 and 3 and determines it as a connection base station (step S47). At the same time, the terminal state of the terminal such as the remaining battery level is acquired from the state management unit 13 (step S48). For example, if the wireless base station 2 is selected as a connection base station, the wireless terminal 5 transmits a connection notification and a terminal state to the wireless base station 2 and requests connection processing (step S49).

  When the wireless base station 2 receives the connection notification and the terminal state from the wireless terminal 5, the wireless base station 2 manages its own base station state managed by the state management unit 13 and the wireless terminal 4 stored in the state management unit 13 in the previous step S38. A terminal state is transmitted to the calculating part 14 (step S50). Next, the calculation unit 14 determines a base station search period and the like based on the terminal state of the wireless terminal 5, the terminal state of the wireless terminal 4, and its own base station state (step S51).

  For example, when the remaining battery level of the wireless terminal 5 is smaller than the remaining battery level of the wireless terminal 4, the base station search cycle of the wireless terminal 5 is made longer than that of the wireless terminal 4 to save power. To. When the moving speed of the wireless terminal 5 is faster than the moving speed of the wireless terminal 4, the base station search cycle of the wireless terminal 5 is made shorter than that of the wireless terminal 4, and the base station search of the wireless terminal 5 is prioritized. Like that.

  Thereafter, the radio base station 2 transmits the determined search cycle and the like to the radio terminal 5 together with a response signal to the connection notification (step S52). Then, the radio terminal 5 sets the search period received from the radio base station 2 in the state management unit 22, and thereafter searches for the radio base station at the set period interval and transmission timing (step S53). .

  Thus, according to the present embodiment, in determining the base station search period of the wireless terminal 5, in order to take into account the terminal state of the wireless terminal 4, in addition to being able to coordinate between the wireless terminals It becomes possible to adjust the traffic according to the situation of each wireless terminal.

  Next, a fourth embodiment of the wireless communication system according to the present invention will be described with reference to FIG. The system configuration is the same as that of the first embodiment, as shown in FIGS.

  First, the wireless terminal 4 transmits a base station search signal to each of the wireless base stations 2 and 3 to perform a base station search (steps S61 and S62). Next, each of the wireless base stations 2 and 3 returns a response signal to the wireless terminal 4 in response to the base station search signal from the wireless terminal 4 (steps S63 and S64).

  Next, the computing unit 23 of the wireless terminal 4 selects a base station suitable for its own wireless communication from the wireless base stations 2 and 3 and determines it as a connection base station (step S65). At the same time, the terminal state of the terminal such as the remaining battery level is acquired from the state management unit 13 (step S66). For example, if the wireless base station 3 is selected as a connection base station, the wireless terminal 4 transmits a connection notification and a terminal state to the wireless base station 3 and requests connection processing (step S67).

  When the wireless base station 3 receives the connection notification and the terminal state from the wireless terminal 4, the wireless base station 3 acquires its own base station state from the state management unit 13 (step S68), and the base station with respect to the other wireless base stations 2 A state is requested (step S69).

  In response to a request from the radio base station 3, the radio base station 2 acquires its own base station state from the state management unit 13, and returns it to the radio base station 3 (steps S70 and S71).

  Next, the radio base station 3 determines the base station search cycle and the like in the computing unit 14 based on the terminal state of the radio terminal 4, its own base station state, and the base station state of the radio base station 2 (step S72). ). For example, when the wireless terminal 4 is located in a region where the communication area of the wireless base station 2 and the communication area of the wireless base station 3 overlap, the wireless communication between the wireless base station 2 and the wireless base station 3 Since there is a risk of interference with radio communication, the radio base station 3 is configured so that the transmission timing of the base station search signal to the radio base station 2 and the transmission timing of the base station search signal to the radio base station 3 do not compete with each other. The base station search cycle of the wireless terminal 4 is adjusted.

  When the search cycle and the like are determined, the radio base station 3 transmits the determined search cycle and the like to the radio terminal 4 together with a response signal to the connection notification (step S73). Thereafter, the wireless terminal 4 sets the search period received from the wireless base station 3 in the state management unit 22, and thereafter searches for the wireless base station at the set periodic interval and transmission timing (step S74). .

  As described above, according to the present embodiment, in order to determine the base station search cycle of the wireless terminal 4 in consideration of the base station state possessed by the other wireless base station 2, the cooperation between the wireless terminals is taken. In addition, it is possible to adjust traffic according to the situation of each radio base station.

  In the fourth embodiment, the base station search period and the like are determined based on the terminal state of the wireless terminal 4 and the base station states of the wireless base stations 2 and 3, but the terminal state of the wireless terminal 4 is not necessarily limited. The base station search period and the like may be determined based on the base station status of the radio base stations 2 and 3.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made within the scope of the invention described in the claims.

  For example, in the first to fourth embodiments, the case where the wireless communication system according to the present invention is applied to the position management system and the wireless terminals 4 and 5 are wireless tags attached to articles or the like is illustrated. The present invention can also be applied when a mobile phone or the like other than the wireless tag is used for the wireless terminals 4 and 5.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Supplementary Note 1) A wireless communication system in which a wireless terminal transmits a base station search signal and selects a connection base station from a plurality of wireless base stations, and the wireless base station selected as the connection base station is Wireless communication for determining a base station search period and / or a transmission timing of a base station search signal of the wireless terminal based on its own base station state, and transmitting the determined period and / or transmission timing to the wireless terminal system.

(Supplementary note 2) The radio base station selected as the base station for connection receives a signal indicating a terminal state from the radio terminal, and the radio base station is based on the received terminal state and the own base station state. The wireless communication system according to supplementary note 1, wherein a base station search cycle and / or a base station search signal transmission timing of a terminal is determined.

(Supplementary note 3) The radio base station selected as the base station for connection receives the signal indicating the terminal status from a plurality of radio terminals, and the received terminal status of the plurality of radio terminals and the own base station The wireless communication system according to supplementary note 2, wherein a base station search period and / or a base station search signal transmission timing of the wireless terminal is determined based on a state.

(Supplementary Note 4) Each of the plurality of radio base stations is connected to each other so that they can communicate with each other, and a radio base station selected as the base station for connection transmits a signal indicating the base station status from another radio base station. Appendices 1, 2 for acquiring and determining a base station search period and / or a base station search signal transmission timing of the wireless terminal based on the base station state of the other radio base station and the base station state of the base station Or the radio | wireless communications system of 3.

(Additional remark 5) The said base station state includes additional connection 1 thru | or the connection state with other radio | wireless terminals (terminal other than the radio | wireless terminal from which the base station search period and / or base station search signal transmission timing are determined) 5. The wireless communication system according to any one of 4 above.

(Supplementary note 6) The wireless communication system according to any one of supplementary notes 2 to 5, wherein the terminal state includes at least one of a battery remaining amount, a moving speed, and a connection priority of the wireless terminal.

(Supplementary note 7) A method for setting a base station search period of a radio terminal in a radio communication system in which a radio terminal transmits a base station search signal and selects a base station for connection from a plurality of radio base stations. Then, the radio base station selected as the base station for connection determines the base station search cycle of the radio terminal and / or the transmission timing of the base station search signal based on its base station state, A method for setting a base station search cycle for transmitting the cycle and / or transmission timing to the wireless terminal.

(Supplementary Note 8) A radio base station selected as the base station for connection receives a signal indicating a terminal state from the wireless terminal, and the wireless base station is based on the received terminal state and the own base station state. The base station search cycle setting method according to appendix 7, wherein the base station search cycle of the terminal and / or the transmission timing of the base station search signal is determined.

(Supplementary note 9) A radio base station selected as the base station for connection receives a signal indicating the terminal status from a plurality of radio terminals, and the received terminal status of the plurality of radio terminals and its own base station 9. The base station search cycle setting method according to appendix 8, wherein a base station search cycle and / or a base station search signal transmission timing of the wireless terminal is determined based on a state.

(Supplementary Note 10) Each of the plurality of radio base stations is connected to each other so as to be communicable, and a radio base station selected as the base station for connection transmits a signal indicating the base station state from another radio base station Appendices 7 and 8 for acquiring and determining a base station search cycle and / or a base station search signal transmission timing of the wireless terminal based on the base station state of the other radio base station and the base station state of the base station Or the base station search cycle setting method according to 9.

(Additional remark 11) The said base station state includes the additional state 7 thru | or the connection state with other radio | wireless terminals (terminal other than the radio | wireless terminal from which the base station search period and / or the transmission timing of a base station search signal are determined) The base station search cycle setting method according to any one of 10.

(Supplementary note 12) The base station search cycle setting method according to any one of Supplementary notes 7 to 11, wherein the terminal state includes at least one of a remaining battery level, a moving speed, and a connection priority of the wireless terminal.

(Supplementary note 13) In response to receiving a base station search signal transmitted from a radio terminal, a response signal is returned to the radio terminal, and a radio functioning as a connection base station in response to a request from the radio terminal When the base station is selected as the base station for connection, the base station search period of the wireless terminal and / or the transmission timing of the base station search signal is determined based on its own base station state, A radio base station that transmits the determined cycle and / or transmission timing to the radio terminal.

(Supplementary Note 14) When selected as the base station for connection, the wireless terminal receives a signal indicating a terminal state from the wireless terminal, and based on the received terminal state and the own base station state, 14. The radio base station according to supplementary note 13, which determines a base station search cycle and / or a base station search signal transmission timing.

(Supplementary note 15) When selected as the base station for connection, the terminal receives signals indicating the terminal states from a plurality of wireless terminals, and receives the terminal states of the plurality of wireless terminals and the own base station state 15. The radio base station according to supplementary note 14, wherein a base station search cycle and / or a base station search signal transmission timing of the radio terminal is determined based on the base station.

(Supplementary Note 16) When connected to another radio base station so as to be communicable and selected as the base station for connection, a signal indicating the state of the base station is acquired from the other radio base station, and the other radio base station The radio base station according to appendix 13, 14 or 15, wherein a base station search cycle and / or a base station search signal transmission timing of the radio terminal is determined based on a base station state of the base station and the base station state of the base station. Bureau.

(Supplementary note 17) The supplementary notes 13 to 13, wherein the base station state includes a connection state with another wireless terminal (a terminal other than a wireless terminal for which a base station search cycle and / or a transmission timing of a base station search signal is determined). The radio base station according to any one of 16.

(Supplementary note 18) The radio base station according to any one of supplementary notes 13 to 17, wherein the terminal state includes at least one of a remaining battery level, a moving speed, and a connection priority of the radio terminal.

DESCRIPTION OF SYMBOLS 1 Wireless communication system 2 Wireless base station 3 Wireless base station 4 Wireless terminal 5 Wireless terminal 11 Wireless transmission / reception part 12 Wire transmission / reception part 13 State management part 14 Operation part 21 Wireless transmission / reception part 22 State management part 23 Operation part

Claims (8)

A wireless communication system in which a wireless terminal transmits a base station search signal and selects a connection base station from a plurality of wireless base stations,
The radio base station selected as the base station for connection determines the base station search period and / or the transmission timing of the base station search signal of the radio terminal based on its own base station state, and the determined period And / or transmitting a transmission timing to the wireless terminal.   The radio base station selected as the base station for connection receives a signal indicating a terminal status from the radio terminal, and the base station of the radio terminal based on the received terminal status and the own base station status The wireless communication system according to claim 1, wherein a search cycle and / or a transmission timing of a base station search signal is determined.   The radio base station selected as the connection base station receives a signal indicating the terminal status from a plurality of radio terminals, and based on the received terminal status of the plurality of radio terminals and the own base station status The wireless communication system according to claim 2, wherein a base station search cycle and / or a base station search signal transmission timing of the wireless terminal is determined.   Each of the plurality of radio base stations is communicably connected to each other, and the radio base station selected as the connection base station acquires a signal indicating the base station status from another radio base station, and The base station search period and / or base station search signal transmission timing of the radio terminal is determined based on a base station state of another radio base station and the own base station state. The wireless communication system according to 2 or 3.   The base station state includes a connection state with another wireless terminal (a terminal other than a wireless terminal for which a base station search period and / or a transmission timing of a base station search signal is determined). The wireless communication system according to any one of 1 to 4.   The wireless communication system according to claim 2, wherein the terminal state includes at least one of a battery remaining amount, a moving speed, and a connection priority of the wireless terminal. In a radio communication system in which a radio terminal transmits a base station search signal and selects a base station for connection from a plurality of radio base stations, a method for setting a base station search cycle of the radio terminal,
The radio base station selected as the base station for connection determines the base station search period and / or the transmission timing of the base station search signal of the radio terminal based on its own base station state, and the determined period And / or transmitting a transmission timing to the wireless terminal. In response to receiving a base station search signal transmitted from a radio terminal, a response signal is returned to the radio terminal, and the radio base station functions as a connection base station in response to a request from the radio terminal. And
When the base station for connection is selected, the base station search cycle of the wireless terminal and / or the transmission timing of the base station search signal is determined based on its own base station state, and the determined cycle and / or Alternatively, a radio base station that transmits a transmission timing to the radio terminal.

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