JP2009302964A - Wireless system, wireless terminal, power control method and power control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless system for efficiently determining schedule information to use, when a wireless terminal having established a DLS (direct link setup) link is, during a power-saving mode. <P>SOLUTION: The wireless system has a first wireless terminal STA1 and a second wireless terminal STA2. The first wireless terminal STA1 transmits to the second terminal STA2 a request frame, including many pieces of schedule information to use, when the wireless terminals STA1 and STA2 having established the DLS links are in power consumption modes. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless system, a wireless terminal, a power control method, and a power control program.

  In recent years, with the rapid spread of the Internet and the development of wireless technology, the use of wireless terminals such as mobile phones and notebook PCs (Personal Computers) has increased. In recent years, wireless terminals are becoming more and more multifunctional and have a limited battery capacity. Therefore, it is important to save power.

  For this reason, a plurality of power saving methods are defined in the IEEE802.11 wireless LAN standard. For example, for the infrastructure mode, power saving methods such as DCF (Distributed Coordination Function), PCF (Point Coordination Function), and HCF (Hybrid Coordination Function) are defined. In addition, a power saving method is also defined for the ad hoc mode (IEEE Std 802.11-2007; see Non-Patent Document 1).

  The IEEE802.11 wireless LAN standard defines DLS (Direct Link Setup) operation (see Non-Patent Document 1). As shown in FIG. 1, the DLS radio system includes at least one AP ′ (Access Point) and a plurality of radio terminals (STA ′; Station), and is a radio belonging to AP ′. Terminals (STA ′) can directly communicate with each other without using AP ′. As a result, wireless terminals (STA ′) that have established a DLS link do not need to perform communication by relaying AP ′, thereby enabling effective use of bandwidth.

  However, it is difficult to directly apply the power saving method defined in the IEEE802.11 wireless LAN standard between the wireless terminals (STA ′) that have established the DLS link.

  For example, the DCF and the PCF are premised on that the wireless terminal (STA ′) performs power saving control in synchronization with the Beacon transmitted from the AP ′. For this reason, DCF and PCF cannot be applied as they are between wireless terminals (STA ′) that have established a DLS link.

  The HCF is premised on that AP 'called HC (Hybrid Coordinator) exists and AP' is always in an Awake state. For this reason, when a function corresponding to HC is installed in a wireless terminal (STA ′), the wireless terminal (STA ′) is always in an Awake state and power saving cannot be achieved. Therefore, HCF cannot be applied as it is between wireless terminals (STA ′) that have established a DLS link.

  For this reason, the current situation is that a power saving method applicable between wireless terminals (STA ′) that have established a DLS link is considered necessary. For example, Non-Patent Document 2 determines the time (schedule information) for direct communication between wireless terminals (STA ′) that have established a DLS link, and based on the determined schedule information, the Awake state and Doze state A method is disclosed in which the transition is performed in synchronization between wireless terminals (STA ′). Hereinafter, the outline of the power saving method disclosed in Non-Patent Document 2 will be described with reference to FIG. The processing operation shown in FIG. 2 will be described on the assumption that the first wireless terminal (QSTA1) and the second wireless terminal (QSTA2) have established a DLS link.

  First, the first wireless terminal (QSTA1) transmits a power saving mode transition request frame (TDLS PSM Switch Request) to the second wireless terminal (QSTA2) as a communication partner (step S1). The power saving mode request frame includes one schedule information to be presented to the second wireless terminal (QSTA2).

  When the second wireless terminal (QSTA2) receives the power saving mode transition request frame, the second wireless terminal (QSTA2) determines whether or not the schedule information included in the power saving mode transition request frame is acceptable, and the power saving mode transition response frame ( TDLS PSM Switch Response) is transmitted to the first wireless terminal (QSTA1) (step S2). In the power saving mode transition response frame, the schedule information acceptance result (acceptance; Accept / rejection; Reject), or the schedule information (Accept with my own schedule) that can be accepted by the second wireless terminal (QSTA2) ) Is included. In this description, it is assumed that the second wireless terminal (QSTA2) transmits a power saving mode transition response frame including acceptance permission (Accept) information to the first wireless terminal (QSTA1). In this case, the second wireless terminal (QSTA2) sets the schedule information presented by the first wireless terminal (QSTA1) as the second wireless terminal (QSTA2) confidence.

  When the first wireless terminal (QSTA1) receives the power saving mode transition response frame, the first wireless terminal (QSTA1) checks the contents included in the power saving mode transition response frame and determines whether or not the power saving mode can be shifted. In this description, since the information on acceptance permission (Accept) is included in the power saving mode transition response frame, it is determined that the first wireless terminal (QSTA1) can shift to the power saving mode, and the second The schedule information presented to the wireless terminal (QSTA2) is set to the first wireless terminal (QSTA1) confidence. As a result, schedule information between the first and second wireless terminals (QSTA1, QSTA2) that established the DLS link is determined, and the negotiation of the schedule information is completed.

  The first and second wireless terminals (QSTA1, QSTA2) that have completed the negotiation of the schedule information follow the schedule information determined between the first and second wireless terminals (QSTA1, QSTA2) and are in the power saving mode (Doze state). (Step S3). The first and second wireless terminals (QSTA1, QSTA2) are in the Awake state when the scheduled information time set in the first and second wireless terminals (QSTA1, QSTA2) is reached (scheduled time). (Step S4). Then, communication is performed between the first and second wireless terminals (QSTA1, QSTA2) having established the DLS link, and data is transmitted from the second wireless terminal (QSTA2) to the first wireless terminal (QSTA1) (step) S5). This determines the time (schedule information) for direct communication between the wireless terminals (QSTA1, QSTA2) that have established the DLS link, and the wireless terminal transitions between the Awake state and the Doze state based on the determined schedule information. (QSTA1, QSTA2) can be performed synchronously.

Further, as a prior art document filed prior to the present invention, there is a document that discloses a technique for performing direct communication between terminals belonging to an access point (see, for example, Patent Documents 1 to 3).
JP 2007-295541 A JP 2007-96862 A JP 2007-215027 A IEEE Std 802.11-2007 IEEE 802.11-08 / 0542r1

  In DLS, it is assumed that each wireless terminal (QSTA1, QSTA2) determines schedule information with another wireless terminal (for example, QSTA3 not shown) that has established an AP or DLS link. For this reason, it is assumed that each wireless terminal (QSTA1, QSTA2) sets a plurality of schedule information.

  However, each wireless terminal (QSTA1, QSTA2) does not manage schedule information set in other wireless terminals. For this reason, in the power saving method of Non-Patent Document 2, it is not possible to create schedule information to be presented to a partner wireless terminal in consideration of schedule information already set for the partner wireless terminal that has established a DLS link. As a result, there may occur a case where schedule information similar to the schedule information already set in the counterpart wireless terminal is presented to the counterpart wireless terminal. Therefore, in the power saving method of Non-Patent Document 2, it is assumed that schedule information cannot be determined efficiently.

  Further, in the power saving method of Non-Patent Document 2, one schedule information is included in a frame and transmitted to the counterpart wireless terminal. For this reason, in the power saving method of Non-Patent Document 2, the schedule information that can be determined by the counterpart wireless terminal is limited to one, and the schedule information cannot be determined efficiently.

  In the power saving method of Non-Patent Document 2, if the wireless terminal (QSTA2) cannot accept the schedule information presented by the counterpart wireless terminal (for example, QSTA1), the wireless terminal (QSTA2) can accept the confidence. It is also possible to present schedule information (Accept with my own schedule) to the counterpart wireless terminal (QSTA1). However, there are cases where the partner wireless terminal (QSTA1) cannot accept the schedule information presented by the wireless terminal (QSTA2), and there is a situation in which the mutual wireless terminals (QSTA1, QSTA2) cannot determine the schedule information acceptable to each other. May occur. As a result, not only does it take time to negotiate schedule information, but the number of frames transmitted between wireless terminals (QSTA1, QSTA2) also increases. Therefore, in the power saving method of Non-Patent Document 2, there is a possibility that a problem occurs that a large amount of power is consumed by negotiating schedule information.

  Moreover, although the said patent documents 1-3 are disclosed about the technique which communicates directly between the terminals which belong to an access point, about the point which negotiates schedule information between the terminals, there is no description. There is no suggestion of necessity.

  The present invention has been made in view of the above circumstances, and a wireless system, a wireless terminal, and a power saving control method capable of efficiently determining schedule information used in a power saving mode by a wireless terminal that has established a DLS link. And it aims at providing a power-saving control program.

  In order to achieve this object, the present invention has the following features.

<Wireless system>
A wireless system according to the present invention includes:
A wireless system having a first wireless terminal and a second wireless terminal,
The first wireless terminal is
The wireless terminal having the DLS link has a first negotiation means for transmitting to the second wireless terminal a request frame including a plurality of schedule information used in the power saving mode.

<Wireless terminal>
The wireless terminal according to the present invention is
It is characterized by having a negotiation means for transmitting a request frame including a plurality of schedule information used by the wireless terminal that has established the DLS link in the power saving mode to the counterpart wireless terminal of the communication partner that has established the DLS link.

The wireless terminal according to the present invention is
When a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link is received from a counterpart wireless terminal of a communication partner that has established a DLS link, the plurality of schedules included in the request frame Negotiation means for determining acceptance schedule information that the wireless terminal can accept from the information,
When the acceptance schedule information is determined, according to the acceptance schedule information, a power control unit that controls to switch to a power saving mode and perform communication at a time according to the acceptance schedule information;
It is characterized by having.

<Power control method>
Moreover, the power control method according to the present invention includes:
A power control method performed in a wireless system having a first wireless terminal and a second wireless terminal,
The first wireless terminal is
The wireless terminal having established the DLS link includes a first negotiation step of transmitting to the second wireless terminal a request frame including a plurality of schedule information used in the power saving mode.

Moreover, the power control method according to the present invention includes:
It is characterized by having a negotiation step of transmitting a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link to a counterpart wireless terminal that has established a DLS link.

Moreover, the power control method according to the present invention includes:
When a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link is received from a counterpart wireless terminal of a communication partner that has established a DLS link, the plurality of schedules included in the request frame Negotiation process for determining acceptance schedule information that can be accepted by the wireless terminals from among the information;
When the acceptance schedule information is determined, according to the acceptance schedule information, a power control step of controlling to perform a transition to a power saving mode and performing communication at a time according to the acceptance schedule information;
It is characterized by having.

<Power control program>
The power control program according to the present invention is
It is characterized in that the computer executes a negotiation process for transmitting a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link to a counterpart wireless terminal that has established a DLS link. To do.

The power control program according to the present invention is
When a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link is received from a counterpart wireless terminal of a communication partner that has established a DLS link, the plurality of schedules included in the request frame Negotiation process for determining acceptance schedule information that can be accepted by the wireless terminals from the information;
When the acceptance schedule information is determined, in accordance with the acceptance schedule information, a power control process for controlling to perform a transition to a power saving mode and performing communication at a time according to the acceptance schedule information;
Is executed by a computer.

  According to the present invention, it is possible to efficiently determine schedule information used by a wireless terminal that has established a DLS link in a power saving mode.

<Overview of wireless system>
First, the outline of the wireless system of the present embodiment will be described with reference to FIG.

  As shown in FIG. 3, the wireless system of the present embodiment is a wireless system having a first wireless terminal (STA1) and a second wireless terminal (STA2). Then, the first wireless terminal (STA1) of the present embodiment transmits a request frame including a plurality of schedule information used by the wireless terminals (STA1, STA2) having established the DLS link in the power saving mode to the second wireless terminal. (STA2) is transmitted.

  Accordingly, the second wireless terminal (STA2) can determine acceptance schedule information that can be accepted by the second wireless terminal (STA2) from among a plurality of schedule information included in the request frame. Therefore, it is possible to efficiently determine schedule information used by the wireless terminals (STA1, STA2) that have established the DLS link in the power saving mode. Hereinafter, the wireless system of the present embodiment will be described in detail with reference to the accompanying drawings.

<System configuration of wireless system>
First, the system configuration of the wireless system of this embodiment will be described with reference to FIG.

  The wireless system of the present embodiment includes at least one AP (Access Point) and a plurality of wireless terminals (STAs), and includes first and second wireless terminals (AP) belonging to the AP. STA1, STA2) can directly communicate with each other without using an AP.

The AP is a device in which the TDLS operation presented in Non-Patent Document 2 is installed on a device defined in the IEEE802.11 wireless LAN standard.
The wireless terminals (STA1, STA2) are devices in which the TDLS operation presented in Non-Patent Document 2 is implemented with respect to devices defined in the IEEE802.11 wireless LAN standard. Examples of the wireless terminals (STA1, STA2) include devices such as mobile phones and notebook PCs (Personal / Computer).

<Wireless terminal: STA1, STA2 configuration>
Next, the configuration of the wireless terminals (STA1, STA2) of the present embodiment will be described with reference to FIG. Note that the first and second wireless terminals (STA1, STA2) constituting the wireless system of the present embodiment have the same structure, and will be described as wireless terminals (STA).

  The wireless terminal (STA) of this embodiment includes a wireless communication unit (11, 11 ′), a power control unit (12, 12 ′), a negotiation unit (13, 13 ′), and a storage unit (14, 14 ′). ) And.

  The wireless communication unit (11, 11 ′) performs wireless communication defined in the IEEE802.11 wireless LAN standard and wireless communication presented in Non-Patent Document 2. The wireless communication unit (11, 11 ') transmits and receives radio frames when the wireless terminal (STA) is in the Awake state, and does not transmit and receive wireless frames when the wireless terminal (STA) is in the Doze state. become.

  The power control unit (12, 12 ′) controls the transition of the Awake / Doze state of the wireless terminal (STA) according to the schedule information stored in the storage unit (14, 14 ′). A plurality of schedule information is stored in the storage unit (14, 14 ′) according to the number of communication counterparts (AP and other DLS wireless terminals).

  The negotiation unit (13, 13 ′) negotiates schedule information. The negotiation unit (13, 13 ′) confirms the schedule information stored in the storage unit (14, 14 ′), and creates schedule information to be presented to the counterpart wireless terminal of the DLS communication partner. Then, the frame including the created schedule information is transmitted to the counterpart wireless terminal. The negotiation unit (13, 13 ′) collates the schedule information presented from the counterpart wireless terminal with the schedule information stored in the storage unit (14, 14 ′), and is presented from the counterpart wireless terminal. It is determined whether or not the received schedule information is acceptable, and a frame including the acceptance result is transmitted to the counterpart wireless terminal. The acceptance result includes information such as acceptance permission (Accept), acceptance rejection (Reject), schedule information (Accept with my own schedule) that can be accepted by the wireless terminal (STA), and the like.

<Processing Operation in Wireless System of Present Embodiment>
Next, processing operations in the wireless system of the present embodiment will be described with reference to FIG. In the following explanation, it is assumed that the wireless terminals (STA1, STA2) belonging to the AP have established a DLS link and are in a state where direct communication is possible between the wireless terminals (STA1, STA2). explain.

  First, the negotiation unit (13) of the first wireless terminal (STA1) confirms the schedule information stored in the storage unit (14), and the first wireless terminal (STA1) and the second wireless terminal (STA2). Schedule information for determining the time for communication with the user is created (step A1).

  The method for creating schedule information is not particularly limited, and any method can be applied. However, when creating the schedule information, it is preferable to create the schedule information in consideration of the communication efficiency and power efficiency of one wireless terminal (STA1) itself. For example, it is preferable to create the schedule information so that the Awake time is as short as possible without interfering with the schedule information stored in the storage unit (14) of the first wireless terminal (STA1).

  In the present embodiment, it is assumed that the three schedule information (S1 to S3) shown in Table 1 has been created. The schedule information (S1 to S3) is created based on a TSF (Time Synchronization Function) defined in the IEEE802.11 wireless LAN standard.

Table 1: Schedule information

  Next, the negotiation unit (13) of the first wireless terminal (STA1) performs a power saving mode transition request frame (TDLS PSM Switch Request) including the three schedule information (S1, S2, S3) created in step A1. Create

  It should be noted that, in order to simplify the explanation here when the three schedule information (S1, S2, S3) created in step A1 are notified in the power saving mode transition request frame, they are presented in Non-Patent Document 2. Instead of “Wakeup Schedule IE” shown in FIG. 6A, “Service Start Time” and “Service Interval” of “Schedule element” shown in FIG. Then, “Wakeup schedule IE” shown in FIG. 6C to which “Number of schedule” representing the number of schedule information is added is used as an example. In this case, the schedule information (S1, S2, S3) shown in Table 1 becomes the schedule information (S1, S2, S3) shown in Table 2, and the parameters of the schedule information (S1, S2, S3) shown in Table 2 are changed. The data is stored in “Service Start Time” and “Service Interval” shown in FIG. 6C, and “Wakeup schedule IE” shown in FIG. 6D is created.

Table 2: Example of parameter information for schedule information

  The format format when storing multiple schedule information (S1, S2, S3) in the power saving mode transition request frame is not particularly limited, and multiple schedule information (S1, S2, S3) is requested to shift to the power saving mode. Any format can be applied as long as it can be stored in the frame. In the above creation method, the three schedule information (S1, S2, S3) created in step A1 is included in the power saving mode transition request frame. However, the schedule information (S1, S2, S2, S3) created in step A1 is included. It is also possible to construct a plurality of schedule information (S1, S2) from S3) so as to be included in the power saving mode transition request frame.

  Next, the negotiation unit (13) sends a power saving mode transition request frame (TDLS PSM Switch Request) including three schedule information (S1, S2, S3) from the wireless communication unit (11) to the second wireless terminal (STA2 ) (Step A2).

  When the negotiation unit (13 ′) of the second wireless terminal (STA2) receives the power saving mode transition request frame (TDLS PSM Switch Request) via the wireless communication unit (11 ′), the power saving mode transition is performed. Three schedule information (S1, S2, S3) included in the request frame is confirmed (step A3). Specifically, the negotiation unit (13 ′) acquires the three schedule information (S1, S2, S3) included in the power saving mode transition request frame, and the acquired three schedule information (S1, S2, S3). ) And the schedule information stored in the storage unit (14 ′) of the second wireless terminal (STA2), and the schedule information (S1, S2, S2) presented from the first wireless terminal (STA1) Judge whether or not S3) is acceptable.

  In addition, the determination method of whether to accept the schedule information (S1, S2, S3) presented from the first wireless terminal (STA1) is not particularly limited, and any determination method can be applied. . However, it is preferable to make a determination in consideration of the communication efficiency and power efficiency of the second wireless terminal (STA2) itself. For example, the schedule information (S1, S2, S3) presented from the first wireless terminal (STA1) does not interfere with the schedule information stored in the storage unit (14 ′) of the second wireless terminal (STA2). Whether or not the power consumption of the second wireless terminal (STA2) is within an allowable range.

  When the negotiation unit (13 ′) has schedule information that can be accepted by the second wireless terminal (STA2) in the schedule information (S1, S2, S3) presented by the first wireless terminal (STA1) Select one of the acceptable schedule information. Then, the negotiation unit (13 ′) creates a power saving mode transition response frame (TDLS PSM Switch Response) including information indicating that the selected schedule information has been accepted.

  For example, the negotiation unit (13 ′) can receive schedule information (S1) that can be accepted by the second wireless terminal (STA2) from the schedule information (S1, S2, S3) presented by the first wireless terminal (STA1). ) Is selected. Then, a power saving mode transition response frame including the determination result (acceptance; Accept) of the schedule information and the acceptable schedule information (S1) is created.

  Note that the format for storing the information indicating acceptance of the schedule information (S1) in the power saving mode transition response frame is not particularly limited, and the information indicating that the schedule information (S1) is accepted is requested to enter the power saving mode. Any format can be applied as long as it can be stored in the frame.

  Next, the negotiation unit (13 ′) of the second wireless terminal (STA2) transmits a power saving mode transition response frame including information indicating that the schedule information (S1) has been accepted from the wireless communication unit (11 ′) to the first. To the wireless terminal (STA1) (step A4). In addition, the negotiation unit (13 ′) stores the schedule information (S1) in the storage unit (14 ′) of the second wireless terminal (STA2).

  When the negotiation unit (13) of the first wireless terminal (STA1) receives the power saving mode transition response frame via the wireless communication unit (11), it confirms the contents included in the power saving mode transition response frame Then, it is determined whether or not it is possible to shift to the power saving mode. In the present embodiment, since the information indicating that the schedule information (S1) has been accepted is included in the power saving mode transition response frame, the negotiation unit (13) determines that the transition to the power saving mode is possible, and the schedule The information (S1) is stored in the storage unit (14) of the first wireless terminal (STA1). As a result, schedule information between the first and second wireless terminals (STA1, STA2) having established the DLS link is determined, and the negotiation of the schedule information is completed.

  The first and second wireless terminals (STA1, STA2) that have completed the negotiation of the schedule information start power control according to the determined schedule information (S1) and shift to the power saving mode (Doze state) (steps). A5). The first and second wireless terminals (STA1, STA2) shift to the Awake state when the time (scheduled time) of the schedule information (S1) stored in the storage unit (14, 14 ′) is reached (step S1). A6). Then, communication is performed between the first and second wireless terminals (STA1, STA2) that have established the DLS link, and data is transmitted from the second wireless terminal (STA2) to the first wireless terminal (STA1) (step) A7). This determines the time (schedule information) for direct communication between the wireless terminals (STA1, STA2) that have established the DLS link, and the wireless terminal transitions between the Awake state and the Doze state based on the determined schedule information. (STA1, STA2) can be performed synchronously.

  FIG. 7 shows an example in which the schedule information between the first and second wireless terminals (STA1, STA2) that established the DLS link is not determined and the schedule information negotiation fails.

  In FIG. 7, when the negotiation unit (13 ′) confirms three schedule information (S1, S2, S3) included in the power saving mode shift request frame (step A3) in step A3, the power saving mode shift is performed. When the schedule information (S1, S2, S3) included in the request frame does not contain schedule information that can be accepted by the second wireless terminal (STA2), acceptance is rejected; transition to power saving mode including Reject information Create a response frame (TDLS PSM Switch Response). Then, the negotiation unit (13 ′) transmits a power saving mode transition response frame including rejection information; Reject information to the first wireless terminal (STA1) (step A′4).

  When the negotiation unit (13) of the first wireless terminal (STA1) receives the power saving mode transition response frame, it can confirm the contents included in the power saving mode transition response frame and shift to the power saving mode. Judge whether or not. In FIG. 7, the power saving mode transition response frame includes information of acceptance refusal; Reject, so that the first wireless terminal (STA1) determines that it cannot transition to the power saving mode. In this case, schedule information between the first and second wireless terminals (STA1, STA2) that have established the DLS link is not determined, and the schedule information negotiation fails. For this reason, the first and second wireless terminals (STA1, STA2) perform communication without performing power control (step A7).

<Operation and effect of wireless system of this embodiment>
As described above, in the wireless system according to the present embodiment, the first wireless terminal (STA1) transmits a power saving mode transition request frame including a plurality of schedule information (S1, S2, S3) to the second wireless terminal (STA2). Send to. Therefore, the second wireless terminal (STA2) can accept schedule information that the second wireless terminal (STA2) can accept from a plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame. It is possible to determine whether or not there is. As a result, the number of schedule information determined by the second wireless terminal increases, and the probability of schedule information determined to be acceptable by the second wireless terminal (STA2) can be improved. This makes it possible to efficiently determine schedule information between wireless terminals (STA1, STA2) that have established a DLS link.

(Second Embodiment)
Next, a second embodiment will be described.

  In the first embodiment, the first wireless terminal (STA1) transmits a power saving mode transition request frame including a plurality of schedule information (S1, S2, S3) to the second wireless terminal (STA2). Then, the second wireless terminal (STA2) receives schedule information that can be accepted by the second wireless terminal (STA2) from among a plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame. I decided to select one. In this case, a plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame may include a plurality of schedule information that can be accepted by the second wireless terminal (STA2).

  In the second embodiment, the first wireless terminal (STA1) transmits a power saving mode transition request frame including a plurality of schedule information (S1, S2, S3) to which priority is added to the second wireless terminal (STA2). ). The second wireless terminal (STA2) includes schedule information that can be accepted by the second wireless terminal (STA2) among a plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame. If there are a plurality of schedule information, one schedule information with high priority is selected. Thus, even when there are a plurality of schedule information that can be accepted by the second wireless terminal (STA2) among a plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame, the schedule information It is possible to select one schedule information with high priority based on the priority added to. Hereinafter, the wireless system of the present embodiment will be described in detail with reference to FIG. Since the system configuration of the second wireless system is configured in the same manner as the first embodiment shown in FIG. 3, the processing operation will be described in detail below.

<Processing Operation in Wireless System of Present Embodiment>
First, the negotiation unit (13) of the first wireless terminal (STA1) confirms the schedule information stored in the storage unit (14), and the first wireless terminal (STA1) and the second wireless terminal (STA2). Schedule information for determining the time for communication with () is created (step B1). In this embodiment, schedule information to which the priority shown in Table 3 is added is created. In Table 3, the lower the priority number, the higher the priority.

優先度１（優先度高）＞優先度２（優先度中）＞優先度３（優先度低） Table 3: Schedule information

Priority 1 (high priority)> Priority 2 (medium priority)> Priority 3 (low priority)

  Next, the negotiation unit (13) of the first wireless terminal (STA1) includes a power saving mode transition request frame (three schedule information (S1, S2, S3) to which the priority created in step B1 is added ( TDLS PSM Switch Request).

  It should be noted that, in order to simplify the explanation here, the three schedule information (S1, S2, S3) to which the priority created in step B1 is added are notified in the power saving mode transition request frame. The “Service Start Time” and “Service Interval” of the “Schedule element” shown in FIG. 6B presented in Non-Patent Document 1 are not the “Wakeup Schedule IE” presented in FIG. “Wakeup schedule IE” shown in FIG. 9A, to which “Priority Order” indicating priority is added, is used as an example. In this case, the schedule information (S1, S2, S3) shown in Table 3 becomes the schedule information (S1, S2, S3) shown in Table 4, and the parameters of the schedule information (S1, S2, S3) shown in Table 4 are changed. It is stored in “Preference Order”, “Service Start Time”, and “Service Interval” shown in FIG. 9A, and “Wakeup schedule IE” shown in FIG. 9B is created.

Table 4: Example of parameter information for schedule information

  The format format when storing the plurality of schedule information (S1, S2, S3) with priority added in the power saving mode transition request frame is not particularly limited, and the plurality of schedule information (S1, S1, with priority added) is not limited. Any format can be applied as long as S2 and S3) can be stored in the power saving mode transition request frame.

  Next, the negotiation unit (13) sends a power saving mode transition request frame (TDLS PSM Switch Request) including the three schedule information (S1, S2, S3) with priorities from the wireless communication unit (11) to the second To the wireless terminal (STA2) (step B2).

  When the negotiation unit (13 ′) of the second wireless terminal (STA2) receives the power saving mode transition request frame (TDLS PSM Switch Request) via the wireless communication unit (11 ′), the power saving mode transition is performed. The three schedule information (S1, S2, S3) to which the priority included in the request frame is added is confirmed (step B3). Specifically, the negotiation unit (13 ′) acquires the three schedule information (S1, S2, S3) included in the power saving mode transition request frame, and the acquired three schedule information (S1, S2, S3). ) And the schedule information stored in the storage unit (14 ′) of the second wireless terminal (STA2), and the schedule information (S1, S2, S2) presented from the first wireless terminal (STA1) Judge whether or not S3) is acceptable.

  The negotiation unit (13 ') has multiple schedule information that can be accepted by the second wireless terminal (STA2) in the schedule information (S1, S2, S3) presented by the first wireless terminal (STA1) When doing so, one schedule information with high priority is selected based on the priority added to the schedule information. Then, the negotiation unit (13 ′) creates a power saving mode transition response frame (TDLS PSM Switch Response) including information indicating that the selected schedule information has been accepted.

  For example, when schedule information (S1, S2) is applicable as schedule information that can be accepted by the second wireless terminal (STA2), schedule information (S1) with high priority is selected. Then, a power saving mode transition response frame including the determination result (acceptance; Accept) of the schedule information and the acceptable schedule information (S1) is created.

  Next, the negotiation unit (13 ′) of the second wireless terminal (STA2) transmits a power saving mode transition response frame including information indicating that the schedule information (S1) has been accepted from the wireless communication unit (11 ′) to the first. To the wireless terminal (STA1) (step B4). In addition, the negotiation unit (13 ′) stores the schedule information (S1) in the storage unit (14 ′) of the second wireless terminal (STA2).

  When the negotiation unit (13) of the first wireless terminal (STA1) receives the power saving mode transition response frame, it can confirm the contents included in the power saving mode transition response frame and shift to the power saving mode. Judge whether or not. In the present embodiment, since the information indicating that the schedule information (S1) has been accepted is included in the power saving mode transition response frame, it is determined that the first wireless terminal (STA1) can transition to the power saving mode. The schedule information (S1) is stored in the storage unit (14) of the first wireless terminal (STA1). As a result, schedule information between the first and second wireless terminals (STA1, STA2) having established the DLS link is determined, and the negotiation of the schedule information is completed.

  The first and second wireless terminals (STA1, STA2) that have completed the negotiation of the schedule information start power control according to the determined schedule information (S1) and shift to the power saving mode (Doze state) (steps). A5). The first and second wireless terminals (STA1, STA2) shift to the Awake state when the time (scheduled time) of the schedule information (S1) stored in the storage unit (14, 14 ′) is reached (step S1). A6). Then, communication is performed between the first and second wireless terminals (STA1, STA2) that have established the DLS link, and data is transmitted from the second wireless terminal (STA2) to the first wireless terminal (STA1) (step) A7). This determines the time (schedule information) for direct communication between the wireless terminals (STA1, STA2) that have established the DLS link, and the wireless terminal transitions between the Awake state and the Doze state based on the determined schedule information. (STA1, STA2) can be performed synchronously.

<Operation and effect of wireless system of this embodiment>
As described above, in the wireless system according to the present embodiment, the first wireless terminal (STA1) transmits the second power saving mode transition request frame including the plurality of schedule information (S1, S2, S3) to which the priority is added. Transmit to the wireless terminal (STA2). The second wireless terminal (STA2) includes schedule information that can be accepted by the second wireless terminal (STA2) among a plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame. If there are a plurality of schedule information, one schedule information with high priority is selected. Thereby, the wireless system in the present embodiment includes a plurality of pieces of schedule information that can be accepted by the second wireless terminal (STA2) among a plurality of pieces of schedule information (S1, S2, S3) included in the power saving mode transition request frame. Even if it exists, it is possible to select one schedule information with a high priority based on the priority added to the schedule information.

(Third embodiment)
Next, a third embodiment will be described.

  In the first embodiment, the second wireless terminal (STA2) can accept the second wireless terminal (STA2) from the schedule information (S1, S2, S3) included in the power saving mode transition request frame. I decided to select one piece of schedule information. In this case, a plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame may include a plurality of schedule information that can be accepted by the second wireless terminal (STA2).

  In the third embodiment, the second wireless terminal (STA2) accepts the second wireless terminal (STA2) among a plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame. When there is a plurality of possible schedule information (for example, S1, S2), a power saving mode transition response frame including the plurality of schedule information (S1, S2) is transmitted to the first wireless terminal (STA1). . Thereby, the first wireless terminal (STA1) has a plurality of schedule information (S1, S2) included in the power mode transition response frame in accordance with the schedule information that can be accepted by the first wireless terminal (STA1). One schedule information can be selected from the list. Hereinafter, the wireless system of the present embodiment will be described in detail with reference to FIG. The system configuration of the third wireless system is configured in the same manner as in the first embodiment shown in FIG. 3, and the processing operation will be described in detail below.

<Processing Operation in Wireless System of Present Embodiment>
The processing from step A1 to step A2 shown in FIG. 10 is the same as the processing from step A1 to step A2 shown in FIG. 5, and the first wireless terminal (STA1) has a plurality of schedule information (S1, S2, S3). A power saving mode transition request frame (TDLS PSM Switch Request) including is transmitted to the second wireless terminal (STA2) (step A2).

  When the negotiation unit (13 ′) of the second wireless terminal (STA2) receives the power saving mode shift request frame (TDLS PSM Switch Request), the three schedule information ( S1, S2, S3) are confirmed (step C3).

  The negotiation unit (13 ') has multiple schedule information that can be accepted by the second wireless terminal (STA2) in the schedule information (S1, S2, S3) presented by the first wireless terminal (STA1) If so, a power saving mode transition response frame (TDLS PSM Switch Response) including the plurality of schedule information is created.

  For example, when the schedule information (S1, S2) is applicable as the schedule information that can be accepted by the second wireless terminal (STA2), the judgment result (acceptance: Accept) of accepting the schedule information is acceptable. A power saving mode transition response frame including schedule information (S1, S2) is created.

  In addition, the format format when storing the determination result (acceptance; Accept) of the schedule information and the acceptable schedule information (S1, S2) in the power saving mode transition response frame is not particularly limited, Any format can be applied.

  Next, the negotiation unit (13 ′) of the second wireless terminal (STA2) includes a determination result (acceptance permission; Accept) of schedule information acceptance and acceptable schedule information (S1, S2). A power saving mode transition response frame is transmitted from the wireless communication unit (11 ′) to the first wireless terminal (STA1) (step C4).

  When the negotiation unit (13) of the first wireless terminal (STA1) receives the power saving mode transition response frame, it can confirm the contents included in the power saving mode transition response frame and shift to the power saving mode. It is determined whether or not (step C5). In the present embodiment, the power saving mode transition response frame includes a determination result (acceptance; Accept) of schedule information and schedule information (S1, S2) that can be accepted by the second wireless terminal (STA2). Therefore, the first wireless terminal (STA1) selects one of the plurality of schedule information (S1, S2) according to the schedule information that can be accepted by the first wireless terminal (STA1). Select schedule information (eg, S1). The negotiation unit (13) stores the selected schedule information (S1) in the storage unit (14) of the first wireless terminal (STA1).

  Next, the negotiation unit (13) creates a second power saving mode transition request frame (TDLS PSM Switch Request) including the selected schedule information (S1). The format format for storing the schedule information (S1) in the power saving mode transition request frame is not particularly limited, and any format format can be applied.

  Next, the negotiation unit (13) receives a second power saving mode transition request frame (TDLS PSM Switch Request) including one schedule information (S1) that can be accepted by the second wireless terminal (STA2). To the wireless terminal (STA2) (step C6).

  When the negotiation unit (13 ′) of the second wireless terminal (STA2) receives the second power saving mode transition request frame, the negotiation unit (13 ′) checks the contents included in the second power saving mode transition request frame, It is determined whether or not it is possible to shift to the power saving mode. In the present embodiment, since the second power saving mode shift request frame includes information indicating that the schedule information (S1) has been accepted, the second wireless terminal (STA2) shifts to the power saving mode. The schedule information (S1) is stored in the storage unit (14 ′) of the second wireless terminal (STA2). As a result, schedule information between the first and second wireless terminals (STA1, STA2) having established the DLS link is determined, and the negotiation of the schedule information is completed.

  The first and second wireless terminals (STA1, STA2) that have completed the negotiation of the schedule information start power control according to the determined schedule information (S1) and shift to the power saving mode (Doze state) (steps). A5). The first and second wireless terminals (STA1, STA2) shift to the Awake state when the time (scheduled time) of the schedule information (S1) stored in the storage unit (14, 14 ′) is reached (step S1). A6). Then, communication is performed between the first and second wireless terminals (STA1, STA2) that have established the DLS link, and data is transmitted from the second wireless terminal (STA2) to the first wireless terminal (STA1) (step) A7). This determines the time (schedule information) for direct communication between the wireless terminals (STA1, STA2) that have established the DLS link, and the wireless terminal transitions between the Awake state and the Doze state based on the determined schedule information. (STA1, STA2) can be performed synchronously.

<Operation and effect of wireless system of this embodiment>
As described above, in the wireless system according to the present embodiment, the second wireless terminal (STA2) includes the second wireless terminal in the plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame. When there are a plurality of schedule information (S1, S2) that can be accepted by (STA2), a power saving mode transition response frame including the plurality of schedule information (S1, S2) is sent to the first wireless terminal (STA1) Send to. Thereby, the first wireless terminal (STA1) has a plurality of schedule information (S1, S2) included in the power mode transition response frame in accordance with the schedule information that can be accepted by the first wireless terminal (STA1). It becomes possible to select one schedule information (S1) from the list.

  In the above embodiment, when the first wireless terminal (STA1) receives the power saving mode transition response frame, a plurality of schedule information (S1, S2) exists in the power saving mode transition response frame. If the first wireless terminal (STA1) accepts one schedule information from among a plurality of schedule information (S1, S2) included in the power mode transition response frame according to the schedule information that can be accepted by the first wireless terminal (STA1). Although it is selected, if one schedule information cannot be selected from the plurality of schedule information (S1, S2), it is possible to construct the schedule information negotiation to end.

(Fourth embodiment)
Next, a fourth embodiment will be described.

  In the third embodiment, the second wireless terminal (STA2) accepts the second wireless terminal (STA2) among a plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame. When there are a plurality of possible schedule information, the power saving mode transition response frame including a plurality of schedule information (S1, S2) that can be accepted by the second wireless terminal (STA2) is sent to the first wireless terminal (STA1). ).

  In the fourth embodiment, the second wireless terminal (STA2) accepts the second wireless terminal (STA2) among the plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame. When there are multiple pieces of schedule information that can be accepted, priority is added to the plurality of schedule information (S1, S2) that can be accepted by the second wireless terminal (STA2), and the plurality of schedule information with the priority added. A power saving mode transition response frame including (S1, S2) is transmitted to the first wireless terminal (STA1). As a result, the first wireless terminal (STA1) can select one of a plurality of schedule information included in the power saving mode transition response frame based on the priority added to the schedule information (S1, S2). Schedule information can be selected. Hereinafter, the wireless system of the present embodiment will be described in detail with reference to FIG. Since the system configuration of the fourth wireless system is configured in the same manner as the first embodiment shown in FIG. 3, the processing operation will be described in detail below.

<Processing Operation in Wireless System of Present Embodiment>
The processing from step A1 to step A2 shown in FIG. 11 is the same as the processing from step A1 to step A2 shown in FIG. 5, and the first wireless terminal (STA1) has a plurality of schedule information (S1, S2, S3). A power saving mode transition request frame (TDLS PSM Switch Request) including is transmitted to the second wireless terminal (STA2) (step A2).

  When the negotiation unit (13 ′) of the second wireless terminal (STA2) receives the power saving mode shift request frame (TDLS PSM Switch Request), the three schedule information ( S1, S2, S3) are confirmed (step C'3).

  The negotiation unit (13 ') has multiple schedule information that can be accepted by the second wireless terminal (STA2) in the schedule information (S1, S2, S3) presented by the first wireless terminal (STA1) If so, a priority is added to the plurality of schedule information. Then, a power saving mode transition response frame (TDLS PSM Switch Response) including schedule information to which priority is added is created.

  For example, when the schedule information (S1, S2) is applicable as the schedule information that can be accepted by the second wireless terminal (STA2), the judgment result (acceptance: Accept) of accepting the schedule information is acceptable. A power saving mode transition response frame including schedule information (S1, S2) and priority of schedule information (S1, S2) is created. In the present embodiment, it is assumed that the schedule information (S1) has a higher priority than the schedule information (S2) (S1> S2).

  In addition, the judgment result (acceptance; Accept) of the schedule information, the acceptable schedule information (S1, S2), and the priority of the schedule information (S1, S2) are displayed in the power saving mode transition response frame. The format format for storing is not particularly limited, and any format format can be applied.

  Next, the negotiation unit (13 ′) of the second wireless terminal (STA2) determines whether to accept the schedule information (acceptance), acceptable schedule information (S1, S2), and schedule information. A power saving mode transition response frame including the priority of (S1, S2) is transmitted from the wireless communication unit (11 ′) to the first wireless terminal (STA1) (step C′4).

  When the negotiation unit (13) of the first wireless terminal (STA1) receives the power saving mode transition response frame, it can confirm the contents included in the power saving mode transition response frame and shift to the power saving mode. Judgment is made (step C'5). In the present embodiment, the power saving mode transition response frame includes a determination result (acceptance; Accept) of schedule information and schedule information (S1, S2) that can be accepted by the second wireless terminal (STA2). , The priority of the schedule information (S1, S2) is included. Therefore, the first wireless terminal (STA1) uses a plurality of schedule information (S1) based on the priority of the schedule information (S1, S2). , S2), one schedule information (S1) is selected. The negotiation unit (13) stores the selected schedule information (S1) in the storage unit (14) of the first wireless terminal (STA1).

  Next, the negotiation unit (13) creates a second power saving mode transition request frame (TDLS PSM Switch Request) including the selected schedule information (S1). The format format for storing the schedule information (S1) in the power saving mode transition request frame is not particularly limited, and any format format can be applied.

  Next, the negotiation unit (13) receives a second power saving mode transition request frame (TDLS PSM Switch Request) including one schedule information (S1) that can be accepted by the second wireless terminal (STA2). To the wireless terminal (STA2) (step C6).

  When the negotiation unit (13 ′) of the second wireless terminal (STA2) receives the second power saving mode transition request frame, the negotiation unit (13 ′) checks the contents included in the second power saving mode transition request frame, It is determined whether or not it is possible to shift to the power saving mode. In the present embodiment, since the second power saving mode shift request frame includes information indicating that the schedule information (S1) has been accepted, the second wireless terminal (STA2) shifts to the power saving mode. The schedule information (S1) is stored in the storage unit (14 ′) of the second wireless terminal (STA2). As a result, schedule information between the first and second wireless terminals (STA1, STA2) having established the DLS link is determined, and the negotiation of the schedule information is completed.

  The first and second wireless terminals (STA1, STA2) that have completed the negotiation of the schedule information start power control according to the determined schedule information (S1) and shift to the power saving mode (Doze state) (steps). A5). The first and second wireless terminals (STA1, STA2) shift to the Awake state when the time (scheduled time) of the schedule information (S1) stored in the storage unit (14, 14 ′) is reached (step S1). A6). Then, communication is performed between the first and second wireless terminals (STA1, STA2) that have established the DLS link, and data is transmitted from the second wireless terminal (STA2) to the first wireless terminal (STA1) (step) A7). This determines the time (schedule information) for direct communication between the wireless terminals (STA1, STA2) that have established the DLS link, and the wireless terminal transitions between the Awake state and the Doze state based on the determined schedule information. (STA1, STA2) can be performed synchronously.

<Operation and effect of wireless system of this embodiment>
As described above, in the wireless system according to the present embodiment, the second wireless terminal (STA2) includes the second wireless terminal in the plurality of schedule information (S1, S2, S3) included in the power saving mode transition request frame. If there are multiple schedule information that can be accepted by (STA2), priorities are added to the multiple schedule information (S1, S2) that can be accepted by the second wireless terminal (STA2), and the priorities are added. The power saving mode transition response frame including the plurality of schedule information (S1, S2) is transmitted to the first wireless terminal (STA1). Thereby, the first wireless terminal (STA1) selects one schedule information from among a plurality of schedule information included in the power mode transition response frame based on the priority added to the schedule information. Is possible.

(Fifth embodiment)
Next, a fifth embodiment will be described.

  In the first embodiment, as shown in FIG. 7, the second wireless terminal (STA2) includes the second wireless terminal in the schedule information (S1, S2, S3) included in the power saving mode transition request frame. When there is no schedule information that can be accepted by the terminal (STA2), acceptance rejection; a power saving mode transition response frame including information on Reject is transmitted to the first wireless terminal (STA1) (step A'4) The first and second wireless terminals (STA1, STA2) perform communication without performing power control (step A7).

  In the fifth embodiment, the second wireless terminal (STA2) can accept the second wireless terminal (STA2) in the schedule information (S1, S2, S3) included in the power saving mode transition request frame. If there is at least one partial information of the start time and period that can be accepted by the second wireless terminal (STA2) in the schedule information (S1, S2, S2) A power saving mode transition response frame including the partial information is transmitted to the first wireless terminal (STA1). As a result, when the first wireless terminal (STA1) receives the power saving mode transition response frame and the partial information of the start time and the period exists in the power saving mode transition response frame, the first wireless terminal (STA1) When the first wireless terminal (STA1) can accept the partial schedule information composed of the partial information of the start time and the cycle, the mode shifts to the power saving mode using the partial schedule information composed of the partial information. It becomes possible. Further, the first wireless terminal (STA1) can use the partial information presented from the second wireless terminal (STA2) as reference information for the next schedule creation. Hereinafter, the wireless system of the present embodiment will be described in detail with reference to FIG. Since the system configuration of the fifth wireless system is configured in the same manner as in the first embodiment shown in FIG. 3, the processing operation will be described in detail below.

<Processing Operation in Wireless System of Present Embodiment>
The processing from step A1 to step A2 shown in FIG. 12 is the same as the processing from step A1 to step A2 shown in FIG. 5, and the first wireless terminal (STA1) has a plurality of schedule information (S1, S2, S3). A power saving mode transition request frame (TDLS PSM Switch Request) including is transmitted to the second wireless terminal (STA2) (step A2).

  When the negotiation unit (13 ′) of the second wireless terminal (STA2) receives the power saving mode shift request frame (TDLS PSM Switch Request), the three schedule information ( S1, S2, S3) are confirmed (step D3).

  The negotiation unit (13 ′) has no schedule information that can be accepted by the second wireless terminal (STA2) in the schedule information (S1, S2, S3) presented by the first wireless terminal (STA1). In this case, whether or not there is a time or period that the second wireless terminal (STA2) can accept in the schedule information (S1, S2, S3) presented from the first wireless terminal (STA1). to decide.

  For example, it is assumed that schedule information (S4) shown in Table 5 is stored in the storage unit (14 ′) of the second wireless terminal (STA2).

Table 5: Schedule information

  Further, the schedule information (S1, S2, S3) presented from the first wireless terminal (STA1) is information shown in Table 6.

Table 6: Schedule information

  Since the schedule information (S4) shown in Table 5 is stored in the storage unit (14 ′) of the second wireless terminal (STA2), the second wireless terminal (STA2) is the first wireless terminal ( The schedule information (S1 to S3) shown in Table 6 presented by STA1) cannot be accepted as it is. However, if it is partial information such as “start time; SST (Service Start Time)” and “cycle; SI (Service Interval)” constituting the schedule information (S1, S2, S3) shown in Table 6, the second The wireless terminal (STA2) may be acceptable. In the case of the schedule information shown in Table 6, the partial information of “start time; SST = 50 ms” constituting the schedule information of S3 and “cycle; SI = 40 ms” constituting the schedule information of S2 is used as the second wireless terminal. (STA2) can accept. Therefore, the negotiation unit (13 ′) of the second wireless terminal (STA2) creates a power saving mode transition response frame (TDLS PSM Switch Response) including partial information that can be accepted by the second wireless terminal (STA2). To do.

  In the case of the schedule information shown in Table 6, “start time; SST = 50 ms” (S3; A) constituting the schedule information of S3, “cycle; SI = 40 ms” (S2; B) constituting the schedule information of S2 ) To create a power saving mode transition response frame (TDLS PSM Switch Response).

  The format format for storing the partial information in the power saving mode transition response frame is not particularly limited, and any format format can be applied.

  Next, the negotiation unit (13 ′) of the second wireless terminal (STA2) sets “start time; SST = 50 ms” (S3; A) constituting the schedule information of S3, and “periods constituting the schedule information of S2 ; SI = 40ms ”(S2; B), a power saving mode transition response frame including the partial information is transmitted from the wireless communication unit (11 ′) to the first wireless terminal (STA1) (step D4).

  When the negotiation unit (13) of the first wireless terminal (STA1) receives the power saving mode transition response frame, it can confirm the contents included in the power saving mode transition response frame and shift to the power saving mode. It is determined whether or not (step D5). In this embodiment, since partial information is included in the power saving mode transition response frame, the negotiation unit (13) can accept the first wireless terminal (STA1) schedule information configured by the partial information. Judge whether or not. The schedule information (S3; A, S2; B) composed of partial information includes “start time; SST = 50 ms” (S3; A) constituting the schedule information of S3, “cycle; SI constituting the schedule information of S2 = 40 ms "(S2; B), and therefore, the cycle is from 40 ms to 40 ms with SF as a reference. For this reason, the negotiation unit (13) determines that the schedule information (S3; A, S2; B) composed of the partial information is acceptable. Further, the negotiation unit (13) stores schedule information (S3; A, S2; B) constituted by partial information in the storage unit (14) of the first wireless terminal (STA1).

  Next, the negotiation unit (13) creates a second power saving mode transition request frame (TDLS PSM Switch Request) including schedule information (S3; A, S2; B) configured by partial information. It should be noted that the format format for storing the schedule information (S3; A, S2; B) composed of the partial information in the power saving mode transition request frame is not particularly limited, and any format format can be applied.

  Next, the negotiation unit (13) sends a second power-saving mode transition request frame (TDLS PSM Switch Request) including schedule information (S3; A, S2; B) composed of partial information to the second wireless terminal. To (STA2) (step D6).

  When the negotiation unit (13 ′) of the second wireless terminal (STA2) receives the second power saving mode transition request frame, the negotiation unit (13 ′) checks the contents included in the second power saving mode transition request frame, It is determined whether or not it is possible to shift to the power saving mode. In the present embodiment, since the second power saving mode transition request frame includes information indicating that the schedule information (S3; A, S2; B) constituted by the partial information has been accepted, the second radio The terminal (STA2) determines that it can shift to the power saving mode, and stores schedule information (S3; A, S2; B) composed of partial information in the storage unit (14 ′) of the second wireless terminal (STA2) To do. As a result, schedule information between the first and second wireless terminals (STA1, STA2) having established the DLS link is determined, and the negotiation of the schedule information is completed.

  The first and second wireless terminals (STA1, STA2) that have completed the negotiation of the schedule information start power control according to the schedule information (S3; A, S2; B) configured by the determined partial information, and Transition to the power mode (Doze state) (step A5). The first and second wireless terminals (STA1, STA2) are scheduled time (S3; A, S2; B) configured by the partial information stored in the storage unit (14, 14 '). If this happens, the process shifts to the Awake state (step A6). Then, communication is performed between the first and second wireless terminals (STA1, STA2) that have established the DLS link, and data is transmitted from the second wireless terminal (STA2) to the first wireless terminal (STA1) (step) A7). This determines the time (schedule information) for direct communication between the wireless terminals (STA1, STA2) that have established the DLS link, and the wireless terminal transitions between the Awake state and the Doze state based on the determined schedule information. (STA1, STA2) can be performed synchronously.

<Operation and effect of wireless system of this embodiment>
As described above, in the wireless system according to the present embodiment, the second wireless terminal (STA2) includes the second wireless terminal (STA1, S2, S3) in the schedule information (S1, S2, S3) included in the power saving mode transition request frame. There is no schedule information that can be accepted by STA2), but at least one partial information of the start time and period that can be accepted by the second wireless terminal (STA2) is included in the schedule information (S1, S2, S2) If it exists, a power saving mode transition response frame including the partial information is transmitted to the first wireless terminal (STA1). As a result, when the first wireless terminal (STA1) receives the power saving mode transition response frame and the partial information of the start time and the period exists in the power saving mode transition response frame, the first wireless terminal (STA1) When the first wireless terminal (STA1) can accept the partial schedule information composed of the partial information of the start time and the cycle, the mode shifts to the power saving mode using the partial schedule information composed of the partial information. It becomes possible. Further, the first wireless terminal (STA1) can use the partial information presented from the second wireless terminal (STA2) as reference information for the next schedule creation.

  In the above embodiment, the second wireless terminal (STA2) has at least one of the start time and the period that can be accepted by the second wireless terminal (STA2) in the schedule information (S1, S2, S2). When the partial information exists, the power saving mode transition response frame including the partial information is transmitted to the first wireless terminal (STA1). However, when a priority is added to each schedule information as in the second embodiment, the start time and period that can be accepted by the second wireless terminal (STA2) using the priority are added. It is also possible to construct so as to select a start time and period with high priority.

  The above-described embodiment is a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiment alone, and various modifications are made without departing from the gist of the present invention. Implementation is possible.

  For example, it is possible to construct various types of processing operations by appropriately combining the processing operations in the above-described embodiments.

  In the above embodiment, the power saving mode transition request frame includes the schedule information to be presented to the counterpart wireless terminal. However, it can be configured to include the schedule information set in the terminal self-confidence. is there. For example, in the above embodiment, the first wireless terminal (STA1) decides to transmit the power saving mode transition request frame including a plurality of schedule information presented to the second wireless terminal (STA2). The setting schedule information stored in the storage unit (14) of one wireless terminal (STA1) is also included in the power saving mode transition request frame and transmitted. As a result, the second wireless terminal (STA2) can grasp the setting schedule information of the first wireless terminal (STA1), and the second wireless terminal (STA2) can recognize the first wireless terminal (STA1). The schedule information to be presented to the first wireless terminal (STA1) can be selected or created in consideration of the setting schedule information set in (1).

  Further, it is possible to construct so that not the schedule information set in the terminal self-confidence but the reject schedule information that the terminal self-acceptance cannot accept is included in the power saving mode transition request frame. For example, in the above embodiment, the first wireless terminal (STA1) decides to transmit the power saving mode transition request frame including a plurality of schedule information presented to the second wireless terminal (STA2). The refusal schedule information that cannot be accepted by one wireless terminal (STA1) is also included in the power saving mode transition request frame and transmitted. As a result, the second wireless terminal (STA2) can grasp the rejection schedule information of the first wireless terminal (STA1), and the second wireless terminal (STA2) can recognize the first wireless terminal (STA1). It is possible to select or create schedule information to be presented to the first wireless terminal (STA1) in consideration of refusal schedule information that cannot be accepted.

  In addition, the control operation in each device configuring the wireless system in the present embodiment described above can be executed using hardware, software, or a combined configuration of both.

  In the case of executing processing using software, it is possible to install and execute a program in which a processing sequence is recorded in a memory in a computer incorporated in dedicated hardware. Alternatively, it can be installed in a memory in a general-purpose computer capable of executing various processes and executed.

  For example, the program can be recorded in advance on a hard disk or ROM (Read Only Memory) as a recording medium. Alternatively, the program can be stored (recorded) temporarily or permanently in a removable recording medium. Such a removable recording medium can be provided as so-called package software. Examples of the removable recording medium include a floppy (registered trademark) disk, a CD-ROM (Compact Disc Read Only Memory), an MO (Magneto optical) disk, a DVD (Digital versatile Disc), a magnetic disk, and a semiconductor memory.

  The program is installed in the computer from the removable recording medium as described above. In addition, it is wirelessly transferred from the download site to the computer. In addition, it is transferred to a computer via a network by wire.

  In addition, the wireless system in the present embodiment not only performs processing in time series according to the processing operation described in the above embodiment, but also in parallel with the processing capability of the apparatus that executes the processing, or as necessary. It is also possible to construct to execute processing individually.

  The present invention is suitable for schedule adjustment between wireless terminals.

It is a figure which shows the system configuration | structure of the radio | wireless system relevant to this invention. It is a figure which shows the processing operation example of the radio | wireless system relevant to this invention. It is a figure which shows the system configuration example of the radio | wireless system of this embodiment. It is a figure which shows the internal structural example of the radio | wireless terminal (STA1, STA2) which comprises the radio | wireless system of this embodiment. It is a 1st figure which shows a series of processing operation examples in the radio | wireless system of 1st Embodiment. It is a figure which shows the example of a frame structure which stores several schedule information. It is a 2nd figure which shows a series of processing operation examples in the radio | wireless system of 1st Embodiment. It is a figure which shows a series of processing operation examples in the radio | wireless system of 2nd Embodiment. It is a figure which shows the example of a frame structure which stores the some schedule information to which the priority was added. It is a figure which shows a series of processing operation examples in the radio | wireless system of 3rd Embodiment. It is a figure which shows a series of processing operation examples in the radio | wireless system of 4th Embodiment. It is a figure which shows a series of processing operation examples in the radio | wireless system of 5th Embodiment.

Explanation of symbols

AP Access Point
STA1, STA2 wireless terminal 11, 11 ′ wireless communication unit 12, 12 ′ power control unit 13, 13 ′ negotiation unit 14, 14 ′ storage unit

Claims (32)

A wireless system having a first wireless terminal and a second wireless terminal,
The first wireless terminal is
A wireless system, comprising: a first negotiation means for transmitting to the second wireless terminal a request frame including a plurality of schedule information used by a wireless terminal that has established a DLS link in a power saving mode. The second wireless terminal is
Second negotiation means for determining acceptance schedule information that can be accepted by the second wireless terminal from among a plurality of schedule information included in the request frame;
The first wireless terminal and the second wireless terminal are:
When the acceptance schedule information is determined, it has power control means for controlling to make a transition to a power saving mode according to the acceptance schedule information and to perform communication at a time corresponding to the acceptance schedule information. Item 2. The wireless system according to Item 1. The second negotiation means is:
When the schedule information that can be accepted by the second wireless terminal is present in the plurality of schedule information included in the request frame, the schedule information that can be accepted by the second wireless terminal is determined as the acceptance schedule information. And sending a response frame including the acceptance schedule information to the first wireless terminal,
The first negotiation means is
3. The wireless system according to claim 2, wherein when the acceptance schedule information is present in the response frame, it is determined that the acceptance schedule information has been determined. The first negotiation means is
A request frame including a plurality of the schedule information to which priority is added is transmitted to the second wireless terminal;
The second negotiation means is:
When there is a plurality of schedule information that can be accepted by the second wireless terminal among a plurality of schedule information included in the request frame, the schedule information having a high priority is determined as the acceptance schedule information. The wireless system according to claim 3. The second negotiation means is:
A response frame including a plurality of schedule information acceptable to the second wireless terminal when there are a plurality of schedule information acceptable to the second wireless terminal among a plurality of schedule information included in the request frame To the first wireless terminal,
The first negotiation means is
When there is a plurality of schedule information that can be accepted by the second wireless terminal in the response frame, one schedule information is determined as the acceptance schedule information from the plurality of schedule information, and the acceptance schedule information A second request frame that includes: to the second wireless terminal;
The second negotiation means is:
4. The wireless system according to claim 3, wherein when the acceptance schedule information is present in the second request frame, it is determined that the acceptance schedule information has been determined. The second negotiation means is:
A response frame including a plurality of schedule information to which priority is added is transmitted to the first wireless terminal;
The first negotiation means is
6. The wireless system according to claim 5, wherein one schedule information among the plurality of schedule information is determined as the acceptance schedule information based on the priority added to the schedule information. The schedule information is
Including a start time for performing communication and a cycle for performing communication,
The second negotiation means is:
There is no schedule information that can be accepted by the second wireless terminal among a plurality of schedule information included in the request frame, but at least one of the start time and the period that can be accepted by the second wireless terminal. 4. The wireless system according to claim 3, wherein when one piece of partial information exists, a response frame including the partial information is transmitted to the first wireless terminal. The first negotiation means is
Whether or not the first wireless terminal can accept partial schedule information composed of partial information of the start time and the period when partial information of the start time and the period exists in the response frame If it is determined that it is acceptable, the partial schedule information is determined as the acceptance schedule information, a second request frame including the acceptance schedule information is transmitted to the second wireless terminal,
The second negotiation means is:
8. The wireless system according to claim 7, wherein the acceptance schedule information is determined to be determined when the acceptance schedule information is present in the second request frame.   A wireless terminal, comprising: a negotiation unit that transmits a request frame including a plurality of schedule information used by a wireless terminal that has established a DLS link in a power saving mode to a counterpart wireless terminal that has established a DLS link.   A power control unit configured to perform control so as to shift to a power saving mode according to the acceptance schedule information and perform communication at a time according to the acceptance schedule information when acceptance schedule information that can be accepted by the counterpart wireless terminal is determined; The wireless terminal according to claim 9, further comprising: The negotiation means is
The wireless terminal according to claim 10, wherein the acceptance schedule information is determined to be determined when there is schedule information that can be accepted by the partner-independent terminal in a response frame to the request frame. The negotiation means is
A request frame including a plurality of the schedule information to which priority is added is transmitted to the counterpart wireless terminal;
12. The wireless terminal according to claim 11, wherein when there is one piece of schedule information that can be accepted by the counterpart wireless terminal in the response frame, it is determined that the acceptance schedule information has been determined. The negotiation means is
When there is a plurality of schedule information that can be accepted by the counterpart wireless terminal in the response frame, one schedule information is determined as the acceptance schedule information from the plurality of schedule information, and the one schedule information is The wireless terminal according to claim 11, wherein the second request frame included is transmitted to the counterpart wireless terminal. The negotiation means is
When there is a plurality of schedule information to which a priority is added in the response frame, one schedule information is determined as the acceptance schedule information from the plurality of schedule information based on the priority. The wireless terminal according to claim 11. The schedule information is
Including a start time for performing communication and a cycle for performing communication,
The negotiation means is
When there is partial information of the start time and the period that can be accepted by the counterpart wireless terminal in the response frame, partial schedule information configured by partial information of the start time and the period is included in the wireless terminal. Is determined to be acceptable, and if it is determined to be acceptable, the partial schedule information is determined as the acceptance schedule information, and a second request frame including the partial schedule information is transmitted to the counterpart wireless terminal The wireless terminal according to claim 11, wherein: When a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link is received from a counterpart wireless terminal of a communication partner that has established a DLS link, the plurality of schedules included in the request frame Negotiation means for determining acceptance schedule information that the wireless terminal can accept from the information,
When the acceptance schedule information is determined, according to the acceptance schedule information, a power control unit that controls to switch to a power saving mode and perform communication at a time according to the acceptance schedule information;
A wireless terminal characterized by comprising: The negotiation means is
When there is schedule information that can be accepted by the wireless terminal among a plurality of schedule information included in the request frame, the wireless terminal determines the schedule information that can be accepted by the wireless terminal as the acceptance schedule information, and the wireless terminal 17. The wireless terminal according to claim 16, wherein a response frame including acceptable schedule information is transmitted to the counterpart wireless terminal. The negotiation means is
When there are a plurality of schedule information that can be accepted by the wireless terminal among a plurality of schedule information included in the request frame, schedule information with a high priority is obtained based on the priority added to the schedule information. The wireless terminal according to claim 17, wherein the wireless terminal is determined as the acceptance schedule information. The negotiation means is
When there is a plurality of schedule information that can be accepted by the wireless terminal among a plurality of schedule information included in the request frame, a response frame that includes a plurality of schedule information that can be accepted by the wireless terminal is sent to the counterpart wireless terminal. To
When the second request frame is received from the counterpart wireless terminal, the acceptance schedule information is determined when there is one schedule information that can be accepted by the wireless terminal in the second request frame. The wireless terminal according to claim 17, wherein the determination is made. The negotiation means is
The wireless terminal according to claim 19, wherein a response frame including a plurality of schedule information to which priority is added is transmitted to the counterpart wireless terminal. The schedule information is
Including a start time for performing communication and a cycle for performing communication,
The negotiation means is
There is no schedule information that can be accepted by the wireless terminal among a plurality of schedule information included in the request frame, but there is at least one partial information of the start time and the period that can be accepted by the wireless terminal. The wireless terminal according to claim 17, wherein a response frame including the partial information is transmitted to the counterpart wireless terminal. The negotiation means is
When the second request frame is received from the counterpart wireless terminal, if the partial schedule information configured by the partial information of the start time and the period exists in the second request frame, the acceptance schedule The wireless terminal according to claim 21, wherein it is determined that the information has been determined. A power control method performed in a wireless system having a first wireless terminal and a second wireless terminal,
The first wireless terminal is
A power control method comprising: a first negotiation step of transmitting a request frame including a plurality of schedule information used by a wireless terminal that has established a DLS link in a power saving mode to the second wireless terminal. The second wireless terminal is
A second negotiation step of determining acceptance schedule information that can be accepted by the second wireless terminal from among a plurality of schedule information included in the request frame;
The first wireless terminal and the second wireless terminal are:
A power control step of controlling to perform a transition to a power saving mode according to the acceptance schedule information and performing communication at a time according to the acceptance schedule information when the acceptance schedule information is determined. Item 24. The power control method according to Item 23.   A power control method comprising: a negotiation step of transmitting a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link to a counterpart wireless terminal that has established a DLS link. .   A power control step of controlling so as to transition to a power saving mode according to the acceptance schedule information and to perform communication at a time corresponding to the acceptance schedule information when acceptance schedule information that can be accepted by the counterpart wireless terminal is determined; 26. The power control method according to claim 25, further comprising: When a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link is received from a counterpart wireless terminal of a communication partner that has established a DLS link, the plurality of schedules included in the request frame Negotiation process for determining acceptance schedule information that can be accepted by the wireless terminals from among the information;
When the acceptance schedule information is determined, according to the acceptance schedule information, a power control step of controlling to perform a transition to a power saving mode and performing communication at a time according to the acceptance schedule information;
A power control method comprising: The negotiation process
When there is schedule information that can be accepted by the wireless terminal among a plurality of schedule information included in the request frame, the wireless terminal determines the schedule information that can be accepted by the wireless terminal as the acceptance schedule information, and the wireless terminal 28. The power control method according to claim 27, wherein a response frame including acceptable schedule information is transmitted to the counterpart wireless terminal.   It is characterized in that the computer executes a negotiation process for transmitting a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link to a counterpart wireless terminal that has established a DLS link. Power control program.   When acceptance schedule information that can be accepted by the counterpart wireless terminal is determined, a power control process for controlling to perform a transition to a power saving mode according to the acceptance schedule information and performing communication at a time according to the acceptance schedule information 30. A power control program according to claim 29, which is executed by a computer. When a request frame including a plurality of schedule information used in a power saving mode by a wireless terminal that has established a DLS link is received from a counterpart wireless terminal of a communication partner that has established a DLS link, the plurality of schedules included in the request frame Negotiation process for determining acceptance schedule information that can be accepted by the wireless terminals from the information;
When the acceptance schedule information is determined, in accordance with the acceptance schedule information, a power control process for controlling to perform a transition to a power saving mode and performing communication at a time according to the acceptance schedule information;
Is a computer-executable power control program. The negotiation process is
When there is schedule information that can be accepted by the wireless terminal among a plurality of schedule information included in the request frame, the wireless terminal determines the schedule information that can be accepted by the wireless terminal as the acceptance schedule information, and the wireless terminal 32. The power control program according to claim 31, wherein a response frame including acceptable schedule information is transmitted to the counterpart wireless terminal.

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