JP2004242187A - Radio terminal - Google Patents

Radio terminal Download PDF

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Publication number
JP2004242187A
JP2004242187A JP2003031313A JP2003031313A JP2004242187A JP 2004242187 A JP2004242187 A JP 2004242187A JP 2003031313 A JP2003031313 A JP 2003031313A JP 2003031313 A JP2003031313 A JP 2003031313A JP 2004242187 A JP2004242187 A JP 2004242187A
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JP
Japan
Prior art keywords
communication
sta
mode
ap
transmission request
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
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JP2003031313A
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Japanese (ja)
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JP2004242187A5 (en
JP4136694B2 (en
Inventor
Takahiro Shichino
隆広 七野
Original Assignee
Canon Inc
キヤノン株式会社
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Priority to JP2003031313A priority Critical patent/JP4136694B2/en
Publication of JP2004242187A publication Critical patent/JP2004242187A/en
Publication of JP2004242187A5 publication Critical patent/JP2004242187A5/ja
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Publication of JP4136694B2 publication Critical patent/JP4136694B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To maintain a communication link by an infrastructure mode without reauthentication, in a communication link maintaining method which maintains a communication link with an access point by returning to the infrastructure mode upon shifting to an ad hoc mode from the infrastructure mode. <P>SOLUTION: Before a link disconnection timer managed on an access point AP 100 side times out, a communication link is disconnected, and reauthentication is required, a station STA 101 receives a transmission request from the access point AP 100 and transmits a transmission request response, thereby maintaining the communication link by an infrastructure mode without reauthentication. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a media access control technique for a wireless communication system.
[0002]
[Prior art]
2. Description of the Related Art Conventional wireless LAN systems include two modes: an infrastructure mode in which a station (hereinafter, referred to as an STA) performs data communication via an access point (hereinafter, referred to as an AP), and an ad hoc mode, in which communication is directly performed between STAs. It has two modes. The infrastructure mode is a type of non-competitive communication system, and the ad hoc mode is a type of competitive communication system.
[0003]
The non-competitive communication method is a method in which a base station sequentially transmits a transmission request signal to a plurality of wireless terminals, and a plurality of terminal devices sequentially transmit a transmission request signal response and a data signal to the base station. On the other hand, the competitive communication system is a system in which a control signal and a data signal are directly transmitted and received between a plurality of wireless terminals.
[0004]
When a station connects to an access point in the infrastructure mode, the station needs an authentication process with the access point. When the authentication process is completed, the link is in a connected state, and data can be freely transmitted and received.
[0005]
In this way, while the station is connecting to the access point in the infrastructure mode, the connection can be interrupted and the mode can be shifted to the ad hoc mode to communicate with other stations.
[0006]
[Problems to be solved by the invention]
By the way, the access point repeatedly transmits a transmission request at predetermined transmission intervals in order to monitor the connection state with the station, and transmits the transmission request before the link disconnection timer mounted on the access point times out. If no request response is returned from the station, the link with the station is disconnected.
[0007]
If a station transitions from infrastructure mode to ad hoc mode, and then wants to return from ad hoc mode to infrastructure mode, if the link between the access point and the station has been disconnected during that time The station had to perform another authentication process.
[0008]
Therefore, the present invention provides a terminal that shifts from a base station communication mode to a terminal-to-terminal communication mode, and then shifts again from the terminal-to-terminal communication mode to the base station communication mode without requiring an authentication process again. It is an object of the present invention to be able to return from the inter-communication mode to the base station communication mode.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, an inter-terminal communication mode for communicating with another wireless terminal, a base station communication mode for communicating with a base station, and communication in the base station communication mode are interrupted. When switching to the terminal-to-terminal communication mode, before returning to the base station in which the base station communication mode has been requested to perform authentication processing again, returning to the communication in the base station communication mode. And a communication control means for controlling the communication.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, several embodiments of the present invention will be described with reference to the drawings. It goes without saying that the present invention is as described in the claims and is not limited to these embodiments.
[0011]
The present embodiment provides a communication link maintaining method for returning to the infrastructure mode and maintaining a communication link with an access point when the mode is shifted from the infrastructure mode to the ad hoc mode. By receiving a transmission request from the access point and transmitting a transmission request response before the link disconnection timer managed on the point side times out and the communication link is disconnected and re-authentication is required, Maintain a communication link in infrastructure mode without authentication.
[0012]
First, an overview of a wireless LAN system to which the present embodiment is applicable will be described. FIG. 1 is a diagram illustrating a configuration example of a wireless LAN system according to the first embodiment. FIG. 1 shows an access point AP100 as a wireless base station and a plurality of stations STA101 to STA104 as wireless terminals.
[0013]
This wireless LAN system has two modes: an infrastructure mode in which STAs perform data communication via an AP, and an ad hoc mode in which STAs perform direct communication between STAs.
[0014]
FIG. 2 is a general sequence diagram until the STA and the AP start data communication in the infrastructure mode. The STA transmits an authentication permission request signal to the AP (S200). The AP performs an authentication process on the STA (S202). If this authentication process is successful, the AP transmits an authentication permission request response (= success) to the STA (S204). Following such a procedure, the STA and the AP transition to the authentication state (S206). Then, the STA transmits a link connection request signal to the AP (S208). The AP transmits a link connection request response (= success) to the STA (S210), and the STA and the AP transit to a link connection state to enable data communication (S212).
[0015]
According to FIG. 1, the STAs 101 to 103 configure a wireless LAN system via the AP 100 and operate in an infrastructure mode. At this time, the AP 100 and the STAs 101 to 103 are in a link connection state. The STA 104 does not belong to the wireless LAN system.
[0016]
FIG. 3 is a diagram for explaining an operation example of the AP and the STA in the infrastructure mode. FIG. 4 is a sequence diagram in the infrastructure mode.
[0017]
In FIG. 3, the horizontal axis is the time axis, and the upper part of the time axis shows packets from the AP to the STA, and the lower part shows packets from the STA to the AP. In the example of FIG. 3, the operation in the infrastructure mode is expressed as repetition of a non-contention communication section (Content-Free Period: hereinafter referred to as CFP) 309. The CFP 309 starts with the transmission and reception of the notification signal 301 (S401) and ends with the transmission and reception of the non-contention communication section end signal 308 (S408).
[0018]
The AP 100 transmits data and a transmission request signal 302 to the STA 101 (S402), and if there is data to be transmitted, the STA 101 transmits a transmission request response 303 to the AP 100 together with the data (S403). The AP 100 transmits a transmission request signal (304) to the STA 102 together with the data (S404), but there may be no response from the STA 102 for some reason (305, S405).
[0019]
The AP 100 transmits data and a transmission request signal (306) to the STA 103 (S406), and if there is data to be transmitted, the STA 103 transmits the data and a transmission request response (307) to the AP 100 (S407).
[0020]
As described above, in the infrastructure mode, communication is performed by the non-competition communication method in which communication does not compete in the wireless LAN system.
[0021]
On the other hand, in the ad hoc mode, since the communication is performed in a contention period (hereinafter, referred to as a CP), there is a possibility that communication may compete, and collision avoidance by the CSMA / CA method (Carrier Sense Multiple Access with Collision Aidance) is performed. Is required.
[0022]
FIG. 5 is a general sequence diagram when the STA 101 shifts from the infrastructure mode to the ad hoc mode and then shifts again to the infrastructure mode with the AP 100. FIG. 6 is a general flowchart of the operation in the AP 100.
[0023]
In step S500, the link connection processing (S200 to S210) shown in FIG. 2 is executed, and the STA 101 is in a link connection state with the AP 100 in the infrastructure mode (S501). When receiving the transmission request from the AP 100 (S502), the STA 101 transmits a transmission request response to the AP 100 (S503). The STA 101 shifts to the ad hoc mode with the STA 104 at a certain time (S504), enters a link connection state with the STA 104, and operates in the ad hoc mode (S505). While operating in the ad hoc mode, the STA 101 does not transmit a transmission request response to the AP 100 even if a transmission request is transmitted from the AP 100 (S506) (S507).
[0024]
The AP 100 has a function of disconnecting the link connection with the STA 101 when the STA 101 does not return a transmission request response even after a certain period of time in response to a transmission request repeatedly transmitted to the STA 101. That is, the AP 100 includes a timer called a link disconnection timer that measures the above-mentioned fixed time, and disconnects the link connection when the timer times out. Note that the value of the link disconnection timer can be set by the user. Once the link connection is disconnected, a re-authentication process is required to start communication in the infrastructure mode again.
[0025]
The AP 100 starts the link disconnection timer when the transmission request is transmitted (S601), but there is no transmission request response from the STA 101 (S602) and the link disconnection timer is not activated (S605). (S508, S606). If the link disconnection timer has already been activated, it is determined whether the link disconnection timer has timed out (S607). If a timeout has occurred (S509), a link connection disconnection notification is sent to the STA 101 (S510, S608), and the link connection with the STA 101 is disconnected (S609).
[0026]
If there is a transmission request response from the STA 101 in S602 and the link disconnection timer has been activated (S603), the AP 100 stops the link disconnection timer and initializes the timer (S604).
[0027]
If the timer has not been started (S605), the AP 100 starts the timer (S606). If it is determined that the timeout has not occurred in S607, the transmission request is transmitted again at a predetermined transmission interval (S601).
[0028]
As described above, in the general wireless LAN system, if the link disconnection timer has already timed out (S509), the link connection with the AP 100 is disconnected (S609). Therefore, when the STA 101 terminates the communication in the ad hoc mode (S511) and desires to return to the communication with the AP 100 in the infrastructure mode, it is necessary to perform the authentication process (S512) again. .
[0029]
[First Embodiment]
FIG. 7 is a diagram illustrating a configuration example of the station according to the first embodiment. The control unit 701 includes a CPU, a RAM, a ROM, and necessary software for controlling the entire station. The wireless unit 702 is a communication circuit such as a DSP or a dedicated circuit for performing wireless communication with the AP 100 or another STA 104 or the like. The link connection maintenance timer 703 is a feature of the first embodiment, and is a timer for determining the timing of returning to the infrastructure mode without requiring re-authentication. The power supply unit 704 is a battery or the like that supplies power to each circuit of the station. The value of the link connection maintenance timer 703 may be set by the user of the station by inputting from the operation unit, or may be set as a default at the time of factory shipment. In this embodiment, the value is determined by the AP 100 and transmitted. The description will be made assuming that the STA receives and sets it.
[0030]
When detecting the timeout of the link connection maintenance timer 703, the control unit 701 switches the operation mode from the ad hoc mode to the infrastructure mode. When wireless section 702 receives the transmission request from AP 100, control section 701 causes wireless section 702 to transmit a transmission request response for responding to the transmission request, and then switches the operation mode from the infrastructure mode to the ad hoc mode.
[0031]
FIG. 8 is a diagram illustrating a configuration example of the access point according to the first embodiment. A control unit 801 includes a CPU, a RAM, a ROM, and necessary software for controlling the entire access point. A wireless unit 802 includes a communication circuit such as a DSP or a dedicated circuit for performing wireless communication with the STA. 803 is a link disconnection timer. When the link disconnection timer 803 times out, the control unit 801 disconnects the link connection with the STA. Reference numeral 804 denotes a link connection maintenance timer value determination unit that determines the value of the link connection maintenance timer 703 of the STA. 805 is a power supply unit.
[0032]
FIG. 9 is a flowchart of the access point according to the first embodiment. FIG. 10 is a flowchart of the station according to the first embodiment. FIG. 11 is a diagram showing a communication sequence according to the first embodiment.
[0033]
In step S1101, the STA 101 and the AP 100 shift to a link connection state via a link connection process (S200 to S210) such as an authentication process.
[0034]
In step S1102, the transmission request signal 302 and the data signal are transmitted from the AP 100 to the STA 101.
In step S1103, the STA 101 transmits the transmission request signal response 303 and the data signal to the AP 100.
[0035]
Steps S1102 and S1103 are executed according to the CFP 309 of FIG.
[0036]
In step S1104, it is assumed that the STA 101 has transmitted a switching notification indicating switching from the infrastructure mode to the ad hoc mode to the AP 100 (S1001).
[0037]
In step S1105, the AP 100 receives a switching notification from the STA 101. Specifically, the control unit 801 of the AP 100 determines whether a switching notification has been received (S901). As a result, if the switching notification has been received, the link connection maintaining timer The value is determined (S902).
[0038]
Then, the AP 100 transmits the value of the determined link connection maintenance timer to the STA 100. Specifically, the control unit 801 controls the wireless unit 802 and transmits the determined value of the link connection maintenance timer to the STA 101 (S903).
[0039]
In step S1106, the STA 101 shifts to the ad hoc mode. Specifically, the control unit 701 of the STA 101 determines whether or not the value of the link connection maintenance timer has been received (S1002), and if it determines that the value has been received, uses the received timer value to set the link connection maintenance timer. 703 is initialized (S1003). Subsequently, the control unit 701 activates the link connection maintenance timer 703 in synchronization with the notification signal 301 received by the wireless unit 702 (S1004).
[0040]
In order to shift to the ad hoc mode with the STA 104, the control unit 701 switches the communication mode to the ad hoc mode with the STA 104 (S1005). In step S1107, the STA 101 shifts to the link connection state with the STA 104.
[0041]
In step S1108, the AP 100 transmits a transmission request to the STA 101. The control 801 controls the radio unit 802 and transmits a transmission request at predetermined transmission intervals (S904).
[0042]
In step S1109, the STA 101 does not return a transmission request response to the transmission request of the AP 100.
[0043]
In step S1110, the AP 100 activates the link disconnection timer 803 because no transmission request response is returned from the STA 101. Specifically, control unit 801 determines whether wireless unit 802 has received a transmission request response from STA 101 (S905). If it is determined that the link has not been received, the control unit 801 determines whether the link disconnection timer 803 has already been started (S908). If not, the control unit 801 starts the link disconnection timer 803 (S909).
[0044]
FIG. 12 is a diagram for explaining the relationship between the value of the link disconnection timer 803 and the value of the link connection maintenance timer 703.
[0045]
Ta in the figure indicates a time interval corresponding to the value of the link disconnection timer. Ta can be set by the user via the external interface 806. Tc represents a time interval corresponding to the non-contention communication section (CFP) 309. According to the example of FIG. 3, in one non-contention communication section 309, the AP 100 always sends a transmission request to each STA once. In other words, during Tc, the AP 100 always makes a transmission request to each STA once.
[0046]
In the link connection maintenance timer value determination unit 804 of the AP 100, the value Tb of the link connection maintenance timer is
Tb ≦ Ta−Tc
Is set to one of the following values: The reason is that after the STA switches to the infrastructure mode due to the timeout of the link connection maintenance timer (timer value Tb), the transmission request of the AP is received and transmitted before the link disconnection timer (timer value Ta) times out. This is because a response can be returned.
[0047]
That is, a plurality of transmission requests can be received before the link disconnection timer (timer value Ta) times out. The section from Ta-Tc to Ta is the last chance to receive the transmission request before disconnecting the link connection. Therefore, if a transmission request response can be sent back to the last transmission request at the latest, there is no possibility that the link connection will be disconnected. Therefore, there is no need for another authentication process.
[0048]
Note that the last transmission request response may be erroneous due to noise or the like. Therefore, Tb = Ta−n * Tc (n is a natural number of 2 or more) may be provided with a margin. However, if the value of n is too large, the time during which communication can be continuously performed in the ad hoc mode is shortened. Therefore, it may be appropriate to set the value to about 2 to 3.
[0049]
In step S1111, the link connection maintenance timer 703 of the STA 101 times out. Specifically, the control unit 701 determines whether the link connection maintenance timer 703 has timed out (S1006). When detecting the timeout, the control unit 701 switches the communication mode from the ad hoc mode to the infrastructure mode (S1007).
[0050]
In step S1112, the AP 100 transmits a transmission request to the STA 101 again.
[0051]
In step S1113, the STA 101 transmits a transmission request response to the AP 100. Specifically, when detecting that the wireless unit 702 has received the transmission request, the control unit 701 controls the wireless unit 702 to transmit a transmission request response (S1008).
[0052]
In step S1114, the AP 100 stops and initializes the link disconnection timer 803. Specifically, the control unit 801 determines whether or not a transmission request response has been received by the wireless unit 802 (S905). If there is a response, it is further determined whether the link disconnection timer 803 has been activated (S906). If activated, the control unit 801 stops and initializes the link disconnection timer 803 (S907).
[0053]
In step S1115, the STA 101 ends the communication in the ad hoc mode. Specifically, the control unit 701 switches to the ad hoc mode to return to the communication in the ad hoc mode (S1009), and determines whether to end the ad hoc mode (S1010). If completed, the operation mode is switched to the infrastructure mode (S1011).
[0054]
In step S1116, the link connection state between the AP 100 and the STA 101 is maintained without requiring re-authentication.
[0055]
The general concept of the present embodiment derived from the above description is as follows.
[0056]
A wireless terminal (eg, STA101) according to the present invention communicates with another wireless terminal (eg, STA104) in a terminal-to-terminal communication mode (eg, ad hoc mode) and communicates with a base station (eg, AP100). Base station communication mode (e.g., infrastructure mode), and when communication in the base station communication mode is interrupted and switched to the terminal-to-terminal communication mode, communication from the base station communication mode is interrupted. And a communication control unit (control unit 701) for controlling to return to communication in the base station communication mode before the authentication processing is requested again.
[0057]
For example, a timer means (link connection maintaining timer 703) for determining the timing of returning to the communication in the base station communication mode is provided, and when the timer means times out, the communication is returned to the communication in the base station communication mode. The control means may control.
[0058]
For example, the timer means measures a predetermined time (eg, Tb) determined according to a transmission interval (eg, Tc) of a plurality of transmission request signals transmitted from the base station to the wireless terminal.
[0059]
When communication with a wireless terminal is started in the base station communication mode, a base station (eg, AP 100) according to the present invention transmits a transmission request to a wireless terminal at a predetermined transmission interval (eg, a control unit). 801, wireless unit 802), disconnection monitoring means (eg, control unit 801, link disconnection timer 803) for monitoring disconnection with the wireless terminal based on whether a transmission request response to the transmission request has been received, When a disconnection is observed by the monitoring unit, the communication unit includes a notifying unit (for example, the control unit 801 and the wireless unit 802) that notifies the wireless terminal of the disconnection.
[0060]
For example, a determining unit (control unit 801) that determines a predetermined time (eg, Tb) according to transmission intervals (eg, Tc) of a plurality of transmission request signals transmitted by the base station to the wireless terminal, A transmission unit (eg, the control unit 801 and the radio unit 802) for transmitting the time to the wireless terminal may be further provided.
[0061]
Of course, the present invention can also be understood as a wireless communication system including any of the above wireless terminals and any of the base stations.
[0062]
Further, the wireless communication system according to the present invention includes one or more base stations and a plurality of wireless terminals, the base station sequentially transmits a transmission request signal to the plurality of wireless terminals, and responds to the transmission request signal A non-competitive communication system in which the plurality of wireless terminals sequentially transmit a transmission request signal response and a data signal to a control terminal, and a competitive communication system in which a control signal and a data signal are transmitted and received in direct communication performed between the plurality of wireless terminals The base station determines a reference time (eg, Tb) that is a reference when the wireless terminal returns from the competitive communication system to the non-competitive communication system. Means for notifying the wireless terminal of the received reference time, a means for receiving the reference time, a timer means for setting and operating the received reference time, and a timer means for That the can also be understood as a radio communication system including a contention communication method and means for returning the non-competitive communication method.
[0063]
For example, the reference time will be determined based on the transmission intervals (Tc) of a plurality of transmission request signals transmitted to the wireless terminal.
[0064]
As described above, since the timeout of the link disconnection timer 803 provided in the AP 100 can be prevented, the AP 100 does not disconnect the link connection with the STA 101. As a result, the STA 101 can return from the ad hoc mode to the infrastructure mode without performing re-authentication processing with the AP 100.
[0065]
[Second embodiment]
In the first embodiment, it is premised that switching between the ad hoc mode and the infrastructure mode is used. In the present embodiment, when the ad hoc mode is activated, the re-authentication is suppressed by using the ad hoc mode and the infrastructure mode in a time sharing manner.
[0066]
FIG. 13 is a diagram illustrating the concept of transmission and reception according to the second embodiment. (A) in the figure is the same as that in the first embodiment, and shows the CFP 309 when only the infrastructure mode or only the ad hoc mode is executed. In this wireless LAN system, communication is performed by repeating the CFP 309 as shown in FIG.
[0067]
On the other hand, in (b), the infrastructure mode is executed in the CFP 1309 in which the width of the CFP 309 is temporarily narrowed, and communication in the ad hoc mode is executed in the CP 1310 which is a vacant time. In the second embodiment. By making the length of the CFP variable in this way, an attempt is made to suppress the re-authentication process accompanying the link disconnection.
[0068]
FIG. 14 is a sequence diagram according to the second embodiment. FIG. 15 is a flowchart of the station according to the second embodiment. FIG. 16 shows a packet configuration of the wireless LAN. The wireless LAN packet includes a preamble / header unit 1601 and an MPDU (Mac Protocol Data Unit) 1602. A part of the MPDU 1602 has a place for storing information for determining the width of the CFP 1309.
[0069]
In step S1401, the STA 101 issues a contention communication section request to the AP 100. Specifically, the control unit 701 determines whether or not the transmission of the competitive communication section request is requested by the user (S1501). If the request is transmitted, the control unit 701 controls the wireless unit 702 to send the competitive communication section request to the AP 100. Send to.
[0070]
In step S1402, upon receiving the competitive communication section request, the AP 100 transmits a competitive communication section request response. Specifically, control unit 801 determines whether or not wireless communication unit 802 has received a competitive communication section request. If it has been received, it controls the radio unit 802 and transmits a contention communication section request response to the STA 101.
[0071]
The control unit 801 writes data for changing the width of the CFP into the MPDU 1602. Thereafter, the width of the CFP is changed, and a CP 1310 is generated between the CFP 1309 and the next CFP 1309. That is, the state shown in FIG. 13A is changed to the state shown in FIG. 13B, and the STA 101 and the AP 100 operate in a time sharing manner between the CFP 1309 and the CP 1310.
[0072]
In step 1403, upon receiving the contention communication section request response from the AP 100, communication with the STA 104 in the ad hoc mode is started. Specifically, the control unit 701 determines whether or not the wireless communication unit 702 has received a competitive communication section request response (S1502). If received, the width of the CFP is changed, and it is determined that the permission to use the infrastructure mode and the ad hoc mode in a time-division manner is granted (S1503). The control unit 701 determines the width of the CP according to the width of the changed CFP written in the MPDU 1602, and determines the timing of time division. Then, the ad hoc mode is started (S1504). In step S1403, the STA 101 shifts to the ad hoc mode with the STA 104.
[0073]
When the CP 1310 occurs in this manner, the STA 101 receives a transmission request from the AP 100 in the CFP 1309 (S1404) and transmits a transmission request response (S1405), and operates in the infrastructure mode, while operating in the CP 1310 with the STA 104 in the ad hoc mode. (S1403).
[0074]
In step S1406, the STA 101 transmits a competitive communication end notification to the AP 100.
[0075]
Specifically, the control unit 701 of the STA 101 determines whether or not to end the communication in the ad hoc mode with the STA 104 (S1505). (S1506).
[0076]
Upon receiving the end notification, the AP 100 rewrites the data in the MPDU 1602 to return the wireless LAN system from the state of FIG. 13B to the state of FIG. 13A.
[0077]
The general concept of the present embodiment derived from the above description is as follows.
[0078]
That is, according to the present invention, an inter-terminal communication mode (eg, ad hoc mode) for communicating with another wireless terminal while communicating in a base station communication mode (eg, infrastructure mode) for communicating with a base station. Is activated, the communication section of the first length (eg, CFP309) for communicating in the base station communication mode is shortened and changed to the communication section of the second length (eg, CFP1309), A wireless communication method for performing communication in a terminal-to-terminal communication mode in an empty section (eg, CP1310) caused by shortening is provided.
[0079]
The method may further include returning the communication section from the second length to the first length after the communication in the terminal-to-terminal communication mode ends.
[0080]
Further, according to the present invention, the mobile station includes one or more base stations (eg, AP100) and a plurality of wireless terminals (eg, STA101 to STA104), and the base station requests transmission to the plurality of wireless terminals in order. In the non-competitive communication method of transmitting a signal, the plurality of wireless terminals sequentially transmit a transmission request signal response and a data signal to the control terminal to respond to the transmission request signal, and a direct communication performed between the plurality of wireless terminals. A wireless communication system supporting a competitive communication system for transmitting and receiving a control signal and a data signal, wherein the wireless communication system operates by providing only a communication section (eg, CFP309) for the non-competitive communication system. In this case, means (eg, control unit 701, wireless unit 702) for requesting the base station to provide a communication section (eg, CP1310) for a competitive communication system is provided. And the base station, means for providing a communication path for competitive communication method and receiving the request: a wireless communication system having a (eg controller 801) are provided.
[0081]
As described above, according to the second embodiment, the AP changes the width of the CFP and time-shares the CFP 1309 and the CP 1302. Since the STA 101 performs the infrastructure mode and the ad hoc mode in a time-division manner, the STA 101 can return from the ad hoc mode to the infrastructure mode without performing re-authentication.
[0082]
[Other embodiments]
Although the embodiment has been described in detail, the present invention may be applied to a system including a plurality of devices, or may be applied to an apparatus including a single device.
[0083]
In the present invention, a software program (a program corresponding to the flowchart shown in FIG. 9 to FIG. 10 or FIG. 15 in this embodiment) for realizing the functions of the above-described embodiment is directly or remotely transmitted to a system or an apparatus. And the computer of the system or the apparatus reads and executes the supplied program code, and this is also achieved. In that case, the form need not be a program as long as it has the function of the program.
[0084]
Therefore, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. That is, the claims of the present invention include the computer program itself for realizing the functional processing of the present invention.
[0085]
In this case, any form of the program, such as an object code, a program executed by an interpreter, and script data to be supplied to the OS, may be used as long as the program has a function.
[0086]
As a recording medium for supplying the program, for example, a floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card , ROM, DVD (DVD-ROM, DVD-R) and the like.
[0087]
In addition, as a method of supplying the program, a client computer connects to an Internet homepage using a browser, and downloads the computer program itself of the present invention or a compressed file including an automatic installation function to a recording medium such as a hard disk from the homepage. Can also be supplied. Further, the present invention can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. In other words, a WWW server that allows a plurality of users to download a program file for implementing the functional processing of the present invention on a computer is also included in the claims of the present invention.
[0088]
In addition, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and downloaded to a user who satisfies predetermined conditions from a homepage via the Internet to download key information for decryption. It is also possible to execute the encrypted program by using the key information and install the program on a computer to realize the program.
[0089]
The functions of the above-described embodiments are implemented when the computer executes the read program, and an OS or the like running on the computer executes a part of the actual processing based on the instructions of the program. Alternatively, all the operations are performed, and the functions of the above-described embodiments can be realized by the processing.
[0090]
Further, after the program read from the recording medium is written into the memory provided in the function expansion board inserted into the computer or the function expansion unit connected to the computer, the function expansion board or the A CPU or the like provided in the function expansion unit performs part or all of the actual processing, and the processing also realizes the functions of the above-described embodiments.
[0091]
【The invention's effect】
According to the present invention, even when switching from the base station communication mode to the inter-terminal communication mode, communication in the inter-base station communication mode can be maintained without the need for re-authentication processing.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of a wireless LAN system according to a first embodiment;
FIG. 2 is a general sequence diagram until the STA and the AP start data communication in the infrastructure mode.
FIG. 3 is a diagram for explaining an operation example of an AP and a STA in an infrastructure mode.
FIG. 4 is a sequence diagram in an infrastructure mode.
FIG. 5 is a general sequence diagram in a case where the STA 101 shifts from the infrastructure mode to the ad hoc mode, and then shifts again to the infrastructure mode with the AP 100.
FIG. 6 is a general flowchart of an operation in the AP 100.
FIG. 7 is a diagram illustrating a configuration example of a station according to the first embodiment.
FIG. 8 is a diagram illustrating a configuration example of an access point according to the first embodiment.
FIG. 9 is a flowchart of an access point according to the first embodiment.
FIG. 10 is a flowchart of a station according to the first embodiment.
FIG. 11 is a diagram showing a communication sequence according to the first embodiment.
FIG. 12 is a diagram for explaining a relationship between a value of a link disconnection timer 803 and a value of a link connection maintenance timer 703.
FIG. 13 is a diagram illustrating a transmission / reception concept according to the second embodiment.
FIG. 14 is a sequence diagram according to the second embodiment.
FIG. 15 is a flowchart of a station according to the second embodiment.
FIG. 16 is a diagram illustrating a packet configuration of a wireless LAN;
[Explanation of symbols]
100 ... Wireless LAN access point
101 to 104: Wireless LAN station

Claims (1)

  1. A terminal-to-terminal communication mode for communicating with another wireless terminal,
    A base station communication mode for communicating with the base station,
    When switching from the base station communication mode to the terminal-to-terminal communication mode, before the base station involved in communication in the base station communication mode requests a re-authentication process, the base station Communication control means for controlling a return to communication in the station communication mode.
JP2003031313A 2003-02-07 2003-02-07 Wireless terminal, base station, and communication link maintaining method Expired - Fee Related JP4136694B2 (en)

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