JP2006314034A - Radio communication method and system - Google Patents

Radio communication method and system Download PDF

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JP2006314034A
JP2006314034A JP2005136098A JP2005136098A JP2006314034A JP 2006314034 A JP2006314034 A JP 2006314034A JP 2005136098 A JP2005136098 A JP 2005136098A JP 2005136098 A JP2005136098 A JP 2005136098A JP 2006314034 A JP2006314034 A JP 2006314034A
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period
wireless communication
frame
txop
terminal
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JP2005136098A
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Wei-Lih Lim
Pek-Yew Tan
ペク ユー タン
ウェイ リー リム
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Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To improve the throughput efficiency of a two-way radio communication. <P>SOLUTION: This radio communication method is performed among a plurality of radio communication apparatuses. A transmission chance is owned by a first radio communication apparatus out of the plurality of radio communication apparatuses. The transmission chance is a period that right for allowing the first radio communication apparatus to start transmission on a radio medium is applied to a first terminal apparatus. A period corresponding to a part of the transmission chance owned by the first radio communication apparatus is allocated to a second radio communication apparatus out of the plurality of radio communication apparatuses. Further, an unused period in the allocated period is returned to the first radio communication apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless communication method and a wireless communication system.

  The growing demand for implementing voice streaming, video communication and Internet access over wireless media has prompted the standardization of technologies that support QoS transmission over wireless media. In Non-Patent Document 1, two channel access mechanisms are defined to support QoS transmission.

  The first mechanism is known as EDCA (Enhanced Distributed Channel Access). This is based on the contention for obtaining a transmission opportunity by providing a difference in priority using an access parameter set.

  The second mechanism is called HCCA (Hybrid Coordination Function Controlled Channel Access). This is done by relying on a media coordinator based on the traffic specifications of each stream registered in advance to dedicate a transmission opportunity to each terminal device.

  Here, according to the definition of Non-Patent Document 1, a transmission opportunity (hereinafter sometimes referred to as “TXOP”) is determined by a certain wireless communication device (hereinafter referred to as “terminal device”) as a transmission or frame on a wireless medium. This is a period in which the right to start exchange (hereinafter collectively referred to as “transmission”) is given to the terminal device.

  When QoS support is introduced in wireless communications, the deployment of set-top boxes, high-definition TV displays, multimedia storage devices, Internet terminal devices, and other high-quality wireless multimedia terminal devices will be further promoted. Accordingly, a user of a wireless communication system such as a wireless network can request more wireless multimedia services.

  Traffic originating from these services may have specific QoS requirements and may be given higher priority than priorities for other traffic being transmitted over the air. If the traffic is combined with existing network traffic, the bandwidth and throughput efficiency realized by NPL 1 must be extended. In particular, the restriction that only the terminal equipment that is the owner of the transmission opportunity can initiate transmission during TXOP is too restrictive.

  In Patent Document 1 relating to a channel access mechanism, a kind of multicast polling is performed in which a large number of TXOPs are successively given to a large number of terminal devices in order to improve throughput efficiency. However, with this method, there may occur a period during which the terminal device is assigned exclusively but is not actually used. Therefore, overall throughput efficiency is reduced.

In Non-Patent Document 2, a transmission request is negotiated before a dedicated allocation of transmission opportunities. The reason for doing this is to notify the exact duration and prevent over-allocation. This process is a three-way handshake. After the terminal device A obtains the TXOP, the terminal device A announces a part of the TXOP that can be dedicated to other terminal devices in order to start transmission in the opposite direction. When this announcement is received, the terminal device B having traffic to be transmitted to the terminal device A waits for the change and transmits a request. After receiving this request, terminal equipment A hands over a portion of TXOP to terminal equipment B for dedicated allocation. The terminal device B that has received the dedicated allocation notification starts transmission. However, this process involves dynamic scheduling and requires complex configuration and control.
US Pat. No. 6,804,222 IEEE 802.11 Amendment Draft v12.0-Part 11 "Wireless LAN Medium Access Control and Physical Layer specifications-Enhancements for Quality of Service" Technical Specification for TGn SYNC's Proposal: 11-04-0889-03-000n-tgnsync-proposal-technical-specification: IEEE802.11document

  In the conventional channel access mechanism, only the terminal device that has obtained the TXOP is allowed to start transmission. This limits the traffic in the opposite direction to be transmitted (eg, VoIP traffic, TCP traffic, etc.) within the same TXOP. These traffics can be transmitted only when the terminal device generating these traffics obtains another TXOP after the end of the current TXOP. Thus, there is no interrelationship between these two TXOPs, including traffic that would otherwise be related to each other. Without scheduling these TXOPs, it is impossible to determine the interval between these two TXOPs. This interval may be affected by network traffic conditions. For example, for TCP traffic, if TCP ACK is not obtained as a response, generation of TCP data traffic stops. Furthermore, communication overhead increases due to attempts to obtain TXOP. Accordingly, the throughput efficiency of the entire wireless communication system is reduced.

  SUMMARY An advantage of some aspects of the invention is that it provides a wireless communication method and a wireless communication system capable of improving the throughput efficiency of bidirectional wireless communication.

  The wireless communication method of the present invention is a wireless communication method executed between a plurality of wireless communication devices, wherein a first wireless communication device among the plurality of wireless communication devices owns a transmission opportunity, and the transmission opportunity A period corresponding to a part is assigned to a second wireless communication apparatus among the plurality of wireless communication apparatuses, and an unused period within the period is returned to the first wireless communication apparatus.

  The wireless communication system of the present invention includes a first wireless communication device and a second wireless communication device, and the first wireless communication device owns a transmission opportunity and a part of the transmission opportunity. Is assigned to the second wireless communication apparatus, and the second wireless communication apparatus assigns an unused period within the period assigned by the first wireless communication apparatus to the first wireless communication apparatus. The structure which reduces is taken.

  According to the present invention, the throughput efficiency of bidirectional wireless communication can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the following description, a specific number, time, configuration, and other parameters are shown for convenience. However, it will be apparent to those skilled in the art that the present invention may be practiced without being limited to these specific details. In order to facilitate understanding of the present invention, the following definitions are used.

  First, a terminal device that owns a TXOP is referred to as a TXOP holder (TXOP holder). The TXOP is given to the TXOP owner by media-only assignment from the media coordinator or by winning by competing with other terminal devices.

  A terminal device to which a period corresponding to a part of TXOP is assigned by the TXOP owner and permitted to start transmission is called a TXOP user (TXOP occupant).

  A group consisting of a plurality of terminal devices operating on the same channel and associated with the same media coordinator is called a service set. The access point may also serve as a media coordinator.

  FIG. 1 is a block diagram of a wireless communication system that achieves higher throughput efficiency by allowing data traffic to be transmitted within the same TXOP from the opposite direction of the current transmission initiated by the TXOP holder; FIG. 2 is a schematic diagram of the mechanism. This is realized when the TXOP holder allocates a part of TXOP to another terminal device and the terminal device to which a part of TXOP is allocated starts transmission. The portion of TXOP assigned may consist of two types of periods, which are illustrated in FIG. 2 as a dedicated assignment period 101 and a limited contention period 110. These two types of periods can be set continuously without being bound by any particular order or form within the non-consecutive periods, as illustrated in FIG. A part of the allocated TXOP is set immediately after transmission from the TXOP holder, but both or one of the two types may be set.

  The first type of period, referred to as the dedicated allocation period 101, consists of a plurality of slots of variable size. Each slot 102 is assigned to one terminal device. In some cases, one terminal device can be assigned more than one slot exclusively. During the slot period from the beginning (start) of the slot to the end (end) of the slot or when the slot is successfully opened, only the terminal equipment that owns (assigned) the slot shall initiate transmission. Can do.

  The size of a dedicated slot is determined based on the need for traffic that is initiated by the terminal equipment that is dedicated to that slot should be immediately received as a TXOP holder. Traffic requirements are to be communicated with the TXOP holder through a Mac level management frame during the setup phase, rather than being negotiated before each dedicated assignment. If the traffic requirements are not known to the TXOP holder prior to this dedicated allocation, the TXOP holder can allocate enough TXOP dedicated to seek the corresponding Mac level response frame.

  When the TXOP holder does not allow the terminal device in the dedicated allocation period 101 to start transmission, the TXOP holder sets the terminal device to zero duration (no connection time) as the dedicated allocation period 101 of the TXOP. Assign to. Even if the zero connection time is allocated in the dedicated allocation period 101, transmission can be started if the competition is won within the next limited contention period.

  In addition, if the TXOP holder has dedicatedly assigned a period having zero duration as the dedicated allocation period 101 to all the terminal devices in the dedicated allocation list, the dedicated allocation period 101 is immediately after its start. To finish.

  In addition, in FIG. 4, when all the portions of the dedicated slot are not used by the terminal device that owns the slot, the TXOP holder can start the next slot earlier. Can be returned. This can be realized by notifying the TXOP holder by frame transmission that the terminal device to which the slot is assigned releases the period remaining in the slot.

  Upon receiving a frame in which such a message is embedded, the TXOP holder can respond to the frame. Hereinafter, this response is referred to as release confirmation. As a result, the starting terminal which is the TXOP holder signals the start time of the next slot which starts immediately after this frame. When the responding terminal receives this release confirmation frame, the owner of the next slot can start transmission. This is illustrated in FIG. For this reason, the unused period in TXOP is not wasted.

  When this dedicated allocation period 101 is set by a media coordinator having a role of managing terminal equipment from a plurality of adjacent channels, transmission over a plurality of channels is possible in the dedicated allocation period 101. This can be achieved by having the terminal equipment initiate transmission and use bandwidth across multiple adjacent channels.

  A second type of period, referred to herein as a restricted contention period 110, is a period during which a subset of terminal equipment restricted to participate in communication is allowed to compete for TXOP. . At the beginning of this limited contention period 110, those terminal devices in the subset that are allowed to compete for TXOP will clear the media reservation record indicating a state that is restricted by the communication of other terminal devices. There must be. Furthermore, all of these terminal devices need to know the end 111 of the limited contention period so that transmissions initiated within the limited contention period 110 do not exceed that end.

  A standard CSMA / CA mechanism is used as a procedure for participating in the competition in the limited competition period 110. In FIG. 2, the terminal device that has won the competition during the limited contention period 110 by performing carrier sense after waiting for the AIFS period becomes the TXOP user.

  At the beginning of transmission, the TXOP user makes a media reservation so that all other terminal devices in the subset are prevented from starting transmission until this media reservation is expired or released. It is necessary to keep. If the duration of transmission is known, the media reservation needs to be set to the actual duration. If you are not sure, you need to set the media reservation to the allowed transmission duration limit. The duration of the transmission must not exceed the specified limit.

  The TXOP user can release the unused period of the obtained TXOP by transmitting a release request frame to signal the intention. This can be achieved by sending a frame signaling to the TXOP holder that the remaining period in the current slot should be released. When receiving the release request frame in which such a message is embedded, the TXOP holder can perform release confirmation. This signals that the previous TXOP user has released its media reservation and that the rest of the allocated period is not in conflict.

  When the responding terminal receives this release confirmation frame, the other terminal devices allowed to participate in the competition can clear their media reservation records and start the competition procedure.

  When this limited contention period 110 is set by a media coordinator that has a role of managing terminal equipment from a plurality of adjacent channels, transmission over a plurality of channels becomes possible in the limited contention period 110. This can be achieved by having the terminal equipment initiate transmission and using bandwidth across multiple adjacent channels.

  In any of the two types of periods described above, all terminal devices that are not allowed to start transmission register a media reservation record that ends in the period specified in the period setting frame. There are two types of period setting frames.

  The first type is shown in FIG. This type of period setting frame is referred to as a centralized period setting frame 300. The centralized period setting frame 300 is a frame transmitted with a plurality of terminal devices in the service set as transmission destinations. The centralized period setting frame 300 includes fields for a plurality of parameters. Parameters include, for example, limited contention duration 301, limited contention start time (not shown), dedicated allocation start time 302, inactivity limit 303, public contention control 304, private contention control 305, dedicated An allocation control 306, a multi-channel 307, and the like can be given.

  The limited contention duration 301 represents the duration of the limited contention period 110.

  The limited contention start time represents the start time of the limited contention period 110. This parameter can be omitted if it can be derived from the context of the centralized period setting frame 300 or if the restricted contention period 110 starts immediately after transmission of the centralized period setting frame 300. In FIG. 5, the limited contention start time is omitted.

  The dedicated allocation start time 302 represents the start time of the dedicated allocation period 101. This parameter can be omitted if it can be derived from the context of the centralized period setting frame 300.

  Inactivity limit 303 represents the duration of the channel idle time required for the TXOP holder to complete the limit contention period 110 early.

  The public competition control 304 is a list of parameters for controlling the competition operation. This parameter list is common to all terminal devices in the subset.

  The private contention control 305 is a list of parameters for enforcing rules for traffic transmitted in the limited contention period 110. This parameter list is specific to each terminal device in the subset.

  Dedicated allocation control 306 is a list of parameters associated with each dedicated allocation slot.

  The multi-channel 307 is used for signaling that a transmission start using a bandwidth over a plurality of adjacent channels is allowed.

  The period setting frame having such a format enables setting of both a dedicated allocation period and a limited contention period. Parameters used to set and manage the dedicated allocation period 101 are a dedicated allocation start time 302, an inactivity limit 303 and a dedicated allocation control 306. The parameters used to set and manage the restricted contention period 110 are the restricted contention duration 301, the restricted contention start time, the inactivity limit 303, the public contention control 304 and the private contention control 305. When only the dedicated allocation period 101 is set, all parameters used for setting and managing the limited contention period 110 are omitted. Alternatively, zero values are assigned to those parameters. Similarly, when only the limited contention period 110 is set, all parameters used for setting and managing the dedicated allocation period 101 are omitted. Alternatively, zero values are assigned to those parameters. Omitted or zero values can be assigned for parameters that are not valid, parameters that cannot be derived from the context, or that produce the same effect as other parameters.

  The second type is shown in FIG. This type of period setting frame is referred to as a distributed period setting frame 400. The distributed period setting frame 400 is a frame transmitted with only one terminal device as a transmission destination. This frame has the same basic format as the centralized period setting frame 300 described above. Among the parameters shown in FIG. 6, the same parameters as those shown in FIG. 5 are indicated by the same names, and detailed description thereof is omitted. The distributed period setting frame 400 does not include a plurality of dedicated allocation control parameters, and the central period setting frame in that public competition control and private competition control are combined to form a competition control. Different from 300. FIG. 6 illustrates a distributed period setting frame 400 including the limited contention start time 401.

  In the dedicated allocation period 101 or the limited contention period 110, if the TXOP holder detects that the media is idle for longer than the duration specified by the inactivity limit, that is, the transmitted data from the responding terminal is If not, the end of the set period can be triggered. Similarly to the release confirmation frame shown in FIG. 4, the TXOP holder transmits a new period setting frame or the release confirmation frame in which RA (Receiving Address) is set to the TXOP holder's MAC address. Or by transmitting a frame used to reset the media reservation record of all the terminal devices in the service set.

  The start time and end time of the limited contention period 110 are determined by the limited contention start time and the limited contention duration specified in the period setting frame. If the limited contention period 110 starts immediately after the period setting frame or can be derived from the context of the period setting frame, the limited contention start time may be removed. The limited contention period 110 automatically ends when the time equals the value specified for the limited contention duration has elapsed since it started. The period allocated to the restricted contention period 110 can be returned to the TXOP holder using the mechanism described above.

  In the limited contention period 110, only a subset of the terminal equipment in the service set can contend for TXOP. By limiting the number of terminal devices to a subset, the level of contention can be controlled or reduced to a reasonable level. Furthermore, parameters related to the CSMA / CA procedure, such as CWmin, CWmax and AIFS, can be set taking into account that the contention level within this period is controlled. The duration of the period obtained by winning the contention is constrained to the value indicated in the parameter called TXOP limit so that more terminal equipment in the subset can obtain at least a portion of the TXOP. Control parameters that are common to all terminal devices in the subset are classified as public competitive controls. Control parameters that are specific to individual terminal devices in the subset are classified as private competitive controls.

  As shown in FIG. 5, the parameters for public contention control are TXOP restriction 311, CWmin 312, CWmax 313, and AIFS 314 for each access category specified in the IEEE 802.11e standard. However, the parameters for public competitive control are not limited to those described above. Parameters for private contention control are TXOP restriction 321 and traffic control 322. However, the parameters for private competition control are not limited to those described above. The TXOP holder can suppress traffic transmitted by a terminal device that responds to a frame transmitted by the TXOP holder (hereinafter referred to as a “response terminal”) by using a traffic control parameter.

  The start time and end time of the dedicated allocation period 101 are determined by the dedicated allocation start time and the sum of all dedicated allocation durations specified in the period setting frame. If the dedicated allocation period starts immediately after the period setting frame, or can be derived from the context of the period setting frame, the dedicated allocation start time may be removed. The dedicated allocation period 101 automatically ends when a period equal to the sum of all dedicated allocation durations has elapsed since it started. The period allocated to the dedicated allocation period 101 can be returned to the TXOP holder for the end of the limited contention period using the same mechanism as described above.

  Each dedicated assignment control includes a list of parameters specific to individual terminal equipment. This is used to configure and manage transmissions initiated by the terminal equipment that owns the slot. These parameters are response terminal MAC address 315, dedicated allocation start time (not shown in FIG. 5 but shown with reference numeral 411 in FIG. 6), traffic control 326 and dedicated allocation duration 325. . However, the parameters for dedicated allocation control are not limited to those described above.

  The response terminal MAC address 315 permits only the terminal device having the designated address or identifier to start transmission between slots.

  The dedicated allocation start time is used to specify the start time of the dedicated allocation slot. This parameter can be applied only to the distributed period setting frame 400.

  The dedicated allocation duration 325 is used to specify the duration of the dedicated allocation slot.

  FIG. 7 is a diagram illustrating a format of a release confirmation frame 500 transmitted by the TXOP holder, and FIG. 8 is a diagram illustrating a format of a release confirmation frame 600 that is an alternative example of the example of FIG. These formats are only used for ease of explanation.

  In general, any frame having the function of resetting the media reservation record of all terminal devices, a group of terminal devices or one terminal device can be used as an open confirmation frame. Another function of the release confirmation frame is that the TXOP holder acts as a response frame to the received release request. For example, an ACK control frame specified by IEEE 802.11 can be used as the release confirmation frame. When using an ACK control frame, a specific encoding is applied to a certain field in the ACK control frame, or a certain bit in the ACK control frame is set to a specific value as an open confirmation frame. It is possible to distinguish between an ACK frame to be used and an existing ACK control frame.

  For example, when the address field of the release confirmation frame (for example, the RA field 501 in FIG. 7) is set to the broadcast MAC address, the remaining period from the end of transmission of the release confirmation frame is released, and the service set It is notified that all of the terminal devices within can operate based on the rules specified to obtain the TXOP. In other words, any terminal device that has received the release confirmation frame with the corresponding address field set to the broadcast MAC address can reset the existing media reservation record. When the address field is set to a multicast address, only the terminal devices belonging to the multicast target group can reset the existing media reservation record. After reset, a group of terminal equipment can attempt to acquire a TXOP based on a predetermined rule.

  If the address field is set to the MAC address of the TXOP holder who is the sender of the release confirmation frame, the TXOP holder is notified that the remaining period is taken over. In other words, the set period ends. When the address field is set to the MAC address of a terminal device other than the TXOP holder, the remaining period up to the end time designated for the next period is assigned exclusively to the terminal device.

  FIG. 9 and FIG. 10 show the flow of processing executed in the starting terminal (TXOP holder) that sets the two types of periods described above.

  First, the initiating terminal must obtain a TXOP in order to become a TXOP holder. Then, it must be determined whether the dedicated allocation period 101 or the limited contention period 110 should be set. If the initiating terminal that is the TXOP holder has enough traffic to fully fill the acquired TXOP, it may decide not to yield the TXOP to the responding terminal. When the dedicated allocation period 101 or the limited contention period 110 is to be set, a period setting frame is generated and transmitted.

  After the period setting frame is transmitted, the dedicated allocation period 101 starts. During this period, if the initiating terminal does not receive any frames within the specified duration, the initiating terminal may decide to end this period. When this period ends, the initiating terminal may decide to reset the dedicated allocation period 101 or the limited contention period 110.

  After the end of the dedicated allocation period 101, the limited contention period 110 starts. During this period, if the initiating terminal has not received any frames within the specified duration and has no frames to transmit, the initiating terminal may decide to release the remaining period of TXOP. . During this period, the initiating terminal may set another QoS level dedicated allocation period 101 or a limited contention period 110. However, the STAs (ie, terminal equipment) involved in setting another level period must be a subset or original set of STAs that are allowed to start transmission within the limited contention period.

  11 and 12 show a flow of processing executed in the response terminal.

  First, a response terminal that is a TXOP user must receive a period setting frame. If, after decoding an incoming frame, the address of the responding terminal is not listed in the frame, the responding terminal is not involved in the set dedicated allocation period or limited contention period. In this case, the response terminal can execute control for power saving or can be in an idle state until the end of the limited contention period. If the address of the responding terminal is listed in the frame, the responding terminal extracts parameters related to the dedicated allocation period and the limited contention period.

  The extracted parameters are: limited contention duration, inactivity limit, dedicated allocation duration, category of traffic that can be transmitted within the period of dedicated allocation, TXOP limit, deferred duration, and time period obtained within the limited contention period This is the category of traffic that can be sent. However, the extracted parameters are not limited to those described above.

  When the period setting frame is a centralized period setting frame, the limited contention start time and the dedicated allocation start time are calculated. If the period setting frame is a distributed period setting frame, the limited contention start time and the dedicated allocation start time are obtained from the frame. At the start of the dedicated allocation slot, the responding terminal transmits a frame queued to the initiating terminal. In the dedicated allocation period, when the response terminal receives a period release frame that ends the dedicated allocation period and / or the limited contention period, it cannot start transmission until another period setting frame is received. If the responding terminal is allowed to start transmission in the limited contention period, the responding terminal must perform the CSMA / CA procedure with the specified deferred duration before starting transmission.

  As described above, the wireless communication method according to the present embodiment is executed between a plurality of wireless communication devices, and among the wireless communication devices, the first wireless communication device owns the TXOP and is included in a part of the TXOP. A corresponding period is assigned to the second wireless communication apparatus among the wireless communication apparatuses, and the unused period within the period is returned to the first wireless communication apparatus.

  The wireless communication system according to the present embodiment includes a first wireless communication device and a second wireless communication device, the first wireless communication device owns the TXOP, and a part of the TXOP. Is assigned to the second wireless communication apparatus, and the second wireless communication apparatus is configured to return the unused period within the period assigned by the first wireless communication apparatus to the first wireless communication apparatus. take.

  This method or configuration can reduce the number of attempts to obtain the required TXOP for bidirectional traffic and reduce the level of contention experienced for responding data traffic from the opposite direction. it can. Thus, throughput efficiency in bidirectional wireless communication can be improved. Also, this method or configuration can significantly reduce the overhead generated during the TXOP acquisition attempt. Furthermore, the number of times the media coordinator allocates TXOP can be reduced. That is, a plurality of TXOPs can be combined into one. As far as bidirectional communication is concerned, it could not be realized without assigning TXOP twice, but in the present invention, it can be realized only by assigning TXOP once.

  The radio communication method according to the present embodiment is a method for realizing higher throughput efficiency in the radio communication system, and is a parameter used for setting and managing transmission or frame exchange within a specific period. Determining one or more frames for communicating the determined parameters to the corresponding terminal device, and transmitting the generated frame to the corresponding terminal device. Can be included.

  Preferably, the aforementioned period is the first type (dedicated allocation period). The first type of period consists of a plurality of slots having a variable size, and each slot is dedicated to a terminal device in the wireless communication system to initiate transmission or frame exchange.

  Also preferably, the aforementioned period is of the second type (limited contention period). In the second type of period, the number of competing terminal devices is limited in order to get an opportunity to start transmission or frame exchange.

  Further, preferably, the first type period and the second type period are set to be continuous with each other. Alternatively, the first type period and the second type period are set separately and independently of each other.

  Further preferably, the frame for setting the first type period derives a parameter representing the start time of the period or a context for deriving the start time, and a parameter representing the duration of the period or the duration. A context and a list of parameters specific to each slot in the period.

  Further, preferably, the list of parameters specific to each slot described above includes a parameter for determining a terminal device that owns each slot, a parameter for determining a start time of each slot, or a context for deriving the start time, A parameter that determines the duration of each slot, and a parameter that manages the traffic generated in each slot during the first type of period.

  Further preferably, the frame for setting the second type of period is selected from a plurality of parameters including a parameter indicating the start time of the period or a context for deriving the start time, a parameter for determining the duration of the period. And a list of parameters for controlling or suppressing traffic generated during the period.

  In addition, preferably the list of parameters that control or suppress the generated traffic includes the parameters that constrain the duration of the period obtained by winning the contention and the media idle time required to own the transmission opportunity. A list of parameters to be determined.

  Furthermore, preferably the list of parameters for determining the media idle time has a smaller value than if used outside the second type of period.

  Furthermore, preferably, both the first type period and the second type period can be set by one frame. To this end, the frame has a parameter or context used to set the first type of period and a parameter or context used to set the second type of period.

  Further, preferably, there is a method for releasing unused periods of a portion of the obtained TXOPs in the first type period or the second type period in order that a limited number of terminal devices obtain TXOPs. Used. This method preferably includes a step of transmitting a request frame to a terminal device that sets a period, and a step of transmitting a response frame indicating that the request is permitted.

  Further, preferably, the response frame is for notifying that the request frame has been received and the request has been granted, and for announcing the decision to start the next operation.

  In addition, preferably, the format of the response frame includes a MAC address field and a field or bit having a specific value used to distinguish the meaning of the frame from the others.

  Further preferably, the value of the MAC address field is set to either a broadcast address, a multicast address, an address of a terminal device for setting a period, or an address of a terminal device different from the terminal apparatus for setting a period. The

  Further preferably, the frame for setting the period has a parameter used to determine the maximum media idle time allowed in the period. When the media is in an idle state for a longer time than the duration specified in this parameter, the terminal device that has set the period can end the period.

  Further, preferably, a frame for resetting the media reservation record of all terminal devices, a group of terminal devices or one terminal device is used. The reset can be performed based on setting information embedded in the frame.

  Furthermore, a frame that ends a set period is preferably used. The frame can be used to end the period set by the terminal device that transmitted the frame.

  The wireless communication method and wireless communication system of the present invention are suitable for performing bidirectional wireless communication using a channel access mechanism for giving a transmission opportunity to a wireless communication apparatus existing in the system.

The figure which shows the structure of the wireless network system which concerns on one embodiment of this invention The figure which shows an example of the sequence of the bidirectional | two-way communication which concerns on one embodiment of this invention The figure which shows an example of the generation order of each period in TXOP which concerns on one embodiment of this invention The figure which shows the other example of the sequence of the bidirectional | two-way communication which concerns on one embodiment of this invention The figure which shows the centralized period setting frame which concerns on one embodiment of this invention The figure which shows the distributed period setting frame which concerns on one embodiment of this invention The figure which shows the open confirmation frame which concerns on one embodiment of this invention The figure which shows the alternative example of the open confirmation frame which concerns on one embodiment of this invention The flowchart for demonstrating a part of radio | wireless communication process in the starting terminal which concerns on one embodiment of this invention The flowchart for demonstrating the other part of the radio | wireless communication process in the start terminal which concerns on one embodiment of this invention The flowchart for demonstrating a part of radio | wireless communication process in the response terminal which concerns on one embodiment of this invention The flowchart for demonstrating the other part of the radio | wireless communication process in the response terminal which concerns on one embodiment of this invention

Explanation of symbols

101 Dedicated allocation period 102 Slot 110 Limited contention period 111 End of limited contention period 300 Centralized period setting frame 400 Distributed period setting frame 500, 600 Release confirmation frame

Claims (2)

  1. A wireless communication method executed between a plurality of wireless communication devices,
    Of the plurality of wireless communication devices, the first wireless communication device has a transmission opportunity,
    A period corresponding to a part of the transmission opportunity is allocated to a second wireless communication device among the plurality of wireless communication devices,
    A wireless communication method for returning an unused period within the period to the first wireless communication apparatus.
  2. A first wireless communication device and a second wireless communication device;
    The first wireless communication device is:
    Owning a transmission opportunity and assigning to the second wireless communication device a period corresponding to a portion of said transmission opportunity;
    The second wireless communication device is:
    Returning an unused period within the period allocated by the first wireless communication device to the first wireless communication device;
    Wireless communication system.
JP2005136098A 2005-05-09 2005-05-09 Radio communication method and system Pending JP2006314034A (en)

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Cited By (6)

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JP2010512716A (en) * 2006-12-14 2010-04-22 インテル コーポレイション Wireless local area network, wireless communication apparatus and method for performing priority control of service
JP2010514314A (en) * 2006-12-18 2010-04-30 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ WLAN QoS scheduling method in heterogeneous applications
JP2013514039A (en) * 2009-12-15 2013-04-22 インテル コーポレイション Method, apparatus, product and system for transmitting information
JP2014526860A (en) * 2011-09-20 2014-10-06 ホアウェイ・テクノロジーズ・カンパニー・リミテッド System and method for contention management in a wireless communication system
JP2017506040A (en) * 2014-02-11 2017-02-23 華為技術有限公司Huawei Technologies Co.,Ltd. Data transmission processing method and apparatus
CN107534939A (en) * 2015-04-10 2018-01-02 高通股份有限公司 IOE equipment transmits signaling and scheduling

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010512716A (en) * 2006-12-14 2010-04-22 インテル コーポレイション Wireless local area network, wireless communication apparatus and method for performing priority control of service
JP2010514314A (en) * 2006-12-18 2010-04-30 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ WLAN QoS scheduling method in heterogeneous applications
JP2013514039A (en) * 2009-12-15 2013-04-22 インテル コーポレイション Method, apparatus, product and system for transmitting information
JP2014526860A (en) * 2011-09-20 2014-10-06 ホアウェイ・テクノロジーズ・カンパニー・リミテッド System and method for contention management in a wireless communication system
US9992796B2 (en) 2011-09-20 2018-06-05 Futurewei Technologies, Inc. System and method for managing contention in a wireless communications system
JP2017506040A (en) * 2014-02-11 2017-02-23 華為技術有限公司Huawei Technologies Co.,Ltd. Data transmission processing method and apparatus
CN107534939A (en) * 2015-04-10 2018-01-02 高通股份有限公司 IOE equipment transmits signaling and scheduling

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