USRE47579E1 - Method and apparatus for transmitting control frame to hidden node in wireless LAN - Google Patents
Method and apparatus for transmitting control frame to hidden node in wireless LAN Download PDFInfo
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- USRE47579E1 USRE47579E1 US13/895,958 US201313895958A USRE47579E US RE47579 E1 USRE47579 E1 US RE47579E1 US 201313895958 A US201313895958 A US 201313895958A US RE47579 E USRE47579 E US RE47579E
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- 238000004590 computer program Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 10
- 101100172132 Mus musculus Eif3a gene Proteins 0.000 description 8
- 108700026140 MAC combination Proteins 0.000 description 2
- VYLDEYYOISNGST-UHFFFAOYSA-N bissulfosuccinimidyl suberate Chemical compound O=C1C(S(=O)(=O)O)CC(=O)N1OC(=O)CCCCCCC(=O)ON1C(=O)C(S(O)(=O)=O)CC1=O VYLDEYYOISNGST-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to a wireless local area network (LAN), and more particularly, to a method of informing nodes included in the wireless LAN of how to avoid access collisions in a wireless LAN.
- LAN wireless local area network
- MAC Medium access control
- CSMA/CA carrier sensing multiple access with collision avoidance
- a physical layer determines whether a received power equal to or greater than a specific value is detected, and informs a medium access control (MAC) layer of whether a medium is in a busy or idle state, thereby sensing a carrier.
- MAC medium access control
- virtual carrier sensing if a MAC protocol data unit (MPDU) can be correctly extracted from a received PHY protocol data unit (PPDU), a header field of the MPDU, that is, a duration/ID field, is analyzed, and the medium is deemed to be in the busy state during a scheduled time for using the medium. Stations determine whether the medium is in the busy state by using the two carrier sensing methods, and do not access the medium if in the busy state.
- MPDU MAC protocol data unit
- PPDU PHY protocol data unit
- a MAC header of a frame transmitted through a general IEEE 802.11 compliant wireless LAN includes duration information indicating a time between when the frame is transmitted and when an ACK frame is received to confirm that the frame is received.
- the stations analyze the MAC header so that medium access is not tried for a duration of time, thereby avoiding collision.
- all stations connected through the wireless LAN can physically receive all frames transmitted in a radio wave coverage area even if the frame is sent to a particular station.
- a frame exchange sequence is shown in which a single MPDU and an ACK frame are involved. However, a plurality of MPDUs may be included in the single PPDU as shown in FIG. 2A .
- a transmitting station and a receiving station exchange a request-to-send (RTS) frame with a clear-to-send (CTS) frame so that other stations do not access the medium for a predetermined time.
- RTS request-to-send
- CTS clear-to-send
- TxOP transmission opportunity
- a network allocation vector (NAV) is a remaining time until the medium is available.
- the transmitting station determines their NAV times using duration fields of a RTS frame, a CTS frame, and a data frame.
- the transmitting station sends a plurality of MPDUs included in a single PPDU.
- the transmitting station sends a plurality of PPDUs within a TxOP obtained by one RTS/CTS exchange sequence.
- data having a size larger than that of the general case of FIG. 1 is transmitted, and thus if an error occurs, more time is required to retransmit the data, thereby causing a longer NAV.
- the transmitting station sends a Contention-Free-End (CF-End) frame. This is illustrated in FIG. 2B . If the TxOP is still left but the medium is no longer used, the transmitting station sends the CF-End frame to cancel the remaining TxOP. Thereafter, other stations which receive the CF-End frame contend again for medium access.
- CF-End Contention-Free-End
- FIGS. 3A to 3C illustrate CF-End frames used for ensuring fair contention among stations for medium access.
- the CSMA/CA can be effectively used only when the MAC protocol data unit/PHY service data unit (MPDU/PSDU) are analyzed without errors. That is, virtual carrier sensing can be carried out only when a MAC header value can be correctly read.
- MPDU/PSDU MAC protocol data unit/PHY service data unit
- the CSMA/CA method becomes ineffective.
- the HT station may be a multi-input-multi-output (MIMO) station which has data transferring capability superior to a station operating in accordance with the 802.11 a/b/g standard.
- MIMO multi-input-multi-output
- an IEEE 802.11n standard has been in development.
- a PHY header of the HT format frame is used as a legacy format (L-Preamble, L-SIG) so as to be recognized by the legacy stations.
- L-Preamble L-SIG
- a RATE field value and a LENGTH field value are determined so that the legacy stations can recognize a time required after an L-SIG field begins and until an ACK frame is received, by analyzing the RATE field and the LENGTH field included in the PHY header.
- the time specified by the RATE field and the LENGTH field will be referred to as an extended PHY protection (EPP).
- EPP extended PHY protection
- the legacy station cannot read the next fields, that is, HT format, which leads to an error. Then, the PHY, or baseband layer, indicates the error occurrence to the MAC layer.
- the error indication begins where the EPP ends. From this point, the legacy station participates in contention for medium access after waiting for a longer time than the HT station.
- EIFS extended inter-frame space
- DIFS Distributed Coordination Function
- FIG. 3C illustrates a CF-End frame used for solving this unfair contention problem.
- the receiving station broadcasts a CF-End frame when a short inter-frame space (SIFS) elapses after an ACK frame for a HT format data frame is received. Since the CF-End frame indicates that the medium is available, the HT station which receives the CF-End frame immediately participates in the contention for medium access without having to wait until the EIFS time elapses.
- SIFS short inter-frame space
- CSMA/CA can be carried out in the wireless LAN by using the CF-End frame, thereby ensuring a fair contention among stations.
- the CF-End frame is not sent to all stations included in the wireless LAN, such advantages cannot be attained.
- a hidden node problem may occur in the wireless LAN.
- a station A broadcasts a frame. Radio wave coverage of each station is indicated by a dotted line.
- a station C can recognize a frame sent from the station A, but a station B may not recognize the frame. In this case, if the station B mistakenly recognizes that a medium is available by carrier sensing and thus tries to send the frame, medium access collision occurs.
- Exemplary embodiments of the present invention overcome the above disadvantages and other disadvantages not described above. Also, the present invention is not required to overcome the disadvantages described above, and an exemplary embodiment of the present invention may not overcome any of the problems described above.
- the present invention provides a method and apparatus which allow stations connected in a wireless LAN to receive a control frame having information regarding media access.
- a method of delivering a control frame for a device which communicates through a wireless LAN comprising receiving a control frame including time information for controlling medium access, checking recipient address information included in the control frame, and broadcasting the received control frame in a selective manner based on the checking result.
- control frame may be a CF-End frame
- the control frame in the broadcasting the received control frame, if the checking result indicates that a basic service set ID (BSSID) recorded in the CF-End frame coincides with a BSSID of a BSS (basic service set), the CF-End frame may be broadcast.
- BSSID basic service set ID
- the received CF-End frame may be broadcast.
- SIFS short inter-frame space
- the wireless LAN is an infrastructure BSS
- the device is an access point of the infrastructure BSS
- the wireless LAN is an IBSS (independent BSS)
- the device may be an IBSS control station that sends a beacon frame.
- a computer-readable medium having embodied thereon a computer program for executing the method above.
- an apparatus for delivering a control frame received through a wireless LAN comprising a recipient address information checking unit which checks recipient address information included in the control frame when the control frame including time information for medium access is received, and a resending unit which broadcasts the received control frame in a selective manner based on the checking result.
- an access point having the apparatus above.
- a wireless LAN station which has the apparatus above, and operates the apparatus only when the wireless LAN station operates as an IBSS control station that sends a beacon frame in the independent BSS.
- FIG. 1 is a diagram illustrating a carrier sensing multiple access with collision avoidance (CSMA/CA) mechanism used in a wireless LAN;
- CSMA/CA carrier sensing multiple access with collision avoidance
- FIGS. 2A and 2B are diagrams illustrating a usage of a CF-End frame
- FIGS. 3A to 3C are diagrams illustrating another usage of a CF-End frame
- FIG. 4 is a diagram illustrating a hidden node problem
- FIG. 5 is a diagram illustrating a principle of solving a hidden node problem according to an exemplary embodiment of the present invention
- FIG. 6 is a diagram illustrating a method of delivering a CF-End frame to a hidden node according to an exemplary embodiment of the present invention
- FIG. 7 is a diagram illustrating a configuration of a CF-End frame
- FIG. 8 is a flowchart illustrating a method of delivering a CF-End frame to a hidden node according to an exemplary embodiment of the present invention.
- FIG. 9 is a block diagram of an apparatus for delivering a CF-End frame to a hidden node according to an exemplary embodiment of the present invention.
- FIG. 5 illustrates a principle of solving a hidden node problem according to an exemplary embodiment of the present invention.
- a station C can receive a CF-End frame sent from a station A.
- a station B cannot receive the CF-End frame sent from the station A since station B is located outside of the radio wave coverage of station A.
- the station B cannot reset a network allocation vector (NAV) in synchronization with station C.
- NAV network allocation vector
- station C which can communicate with station A and station B, delivers the CF-End frame received from station A to station B, thereby solving a hidden node problem.
- the CF-End frame is delivered by an access point, and in an independent BSS (IBSS), the CF-End frame is delivered by an IBSS control station that has most recently sent a beacon frame.
- BSS infrastructure basic service set
- IBSS independent BSS
- control CF-End frame is used so that the transmitting station returns the TxOP
- present exemplary embodiment is not limited thereto, and other types of frames may be used if the frames have a function for resetting the NAV of each station, and if a duration field of each MAC header thereof is set to 0. The same will be also applied hereinafter.
- FIG. 6 is a diagram illustrating a method of delivering a CF-End frame to a hidden node according to an exemplary embodiment of the present invention.
- a station C delivers the CF-End frame sent from station A to station B. That is, the CF-End frame that is broadcast by station A is broadcast again by station C, and station B receives the CF-End frame that is broadcast by station C.
- the station B rebroadcasts the CF-End frame when the short inter-frame space (SIFS) elapses after the CF-End frame sent from station A is received. If an elapsed time is longer than the SIFS, another station which has received the CF-End frame may determine that the medium is available and may try to send the CF-End frame.
- SIFS short inter-frame space
- Station C is not allowed to resend all received CF-End frames.
- Medium access control (MAC) of each station is performed for a medium used in one BSS. Thus, if station C is located in a position in which frames sent from two or more different BSSs can be received, an error may occur during the MAC of the stations.
- station C when station C receives the CF-End frame, station C reads its address field to compare a basic service set ID (BSSID) of the CF-End frame with a BSSID of a BSS in which station C is included. Then, only when the two BSSIDs coincide with each other, station C resends the CF-End frame. Otherwise, station C drops the CF-End frame.
- BSSID basic service set ID
- FIG. 7 illustrates a configuration of the CF-End frame.
- FIG. 8 is a flowchart illustrating a method of delivering a CF-End frame to a hidden node according to an exemplary embodiment of the present invention.
- An access point or an IBSS control station receives a CF-End frame (operation 710 ), and then compares an BSSID recorded in an address field of the received CF-End frame with a BSSID of a BSS where the access point or the IBSS is included (operation 720 ). If the BSSID recorded in the address field of the CF-End frame coincides with the BSSID of the BSS where the access point or the IBSS is included, the access point or the IBSS rebroadcasts the received CF-End frame so that the CF-End frame can be delivered to a hidden node of the BSS where the access point or the IBSS is included (operation 740 ). Otherwise, the access point or the IBSS drops the CF-End frame (operation 730 ).
- FIG. 9 is a block diagram of an apparatus for delivering a CF-End frame to a hidden node according to an exemplary embodiment of the present invention.
- an apparatus 800 for delivering a CF-End frame to a hidden node includes a recipient address information checking unit 800 and a resending unit 820 .
- the apparatus 800 is included in an access point 870 , but the apparatus 800 may be included in an IBSS control station sending a beacon frame, as described above.
- the recipient address information checking unit 800 receives the CF-End frame sent from a first station 850 , and then compares a BSSID recorded in an address field of the received CF-End frame with a BSSID of a BSS which is controlled by the access point 870 . If the two BSSIDs do not coincide with each other, the recipient address information checking unit 800 drops the CF-End frame.
- the resending unit 820 broadcasts the received CF-End frame so that the CF-End frame can be delivered to a second station 860 that is a hidden node.
- all stations included in one BSS can receive the same time information for controlling medium access, thereby solving a hidden node problem.
- a correct CSMA/CA mechanism can be implemented in a wireless LAN, and a fair contention for medium access among the stations can be ensured.
- the exemplary embodiments of the present invention can be written as computer programs which are embodied on computer readable recording media and can be implemented in general-use digital computers that execute the programs using computer readable recording media.
- Examples of the computer readable recording media include magnetic storage media (e.g., ROM, floppy disks, hard disks, etc.), optical recording media (e.g., CD-ROMs, or DVDs), and storage media such as carrier waves (e.g., transmission through the Internet).
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Abstract
A method and apparatus informs nodes included in a wireless local area network (LAN) of how to avoid access collision in a wireless LAN. A wireless LAN access point or an independent basic service set (IBSS) control station receives a Contention-Free-End (CF-End) frame, compares a basic service set ID (BSSID) of the received CF-End frame of the access point or the IBSS, and rebroadcasts the received CF-End frame if the comparison result indicates that the two BSSIDs coincide with each other. Thus, all stations included in one BSS can receive the same time information for controlling medium access.
Description
This application claims priority from Korean Patent Application No. 10-2006-0032408, filed on Apr. 10, 2006 in the Korean Intellectual Property Office, and U.S. Provisional Patent Application No. 60/756,216, filed on Jan. 5, 2006, in the U.S. Patent and Trademarks Office, the disclosures of which are incorporated herein in their entirety by reference.
1. Field of the Invention
The present invention relates to a wireless local area network (LAN), and more particularly, to a method of informing nodes included in the wireless LAN of how to avoid access collisions in a wireless LAN.
2. Description of the Related Art
Medium access control (MAC) using a carrier sensing multiple access with collision avoidance (CSMA/CA) method is used in a wireless LAN.
In the CSMA/CA method, physical carrier sensing and virtual carrier sensing are used for carrier sensing. In physical carrier sensing, a physical layer (PHY) determines whether a received power equal to or greater than a specific value is detected, and informs a medium access control (MAC) layer of whether a medium is in a busy or idle state, thereby sensing a carrier. In virtual carrier sensing, if a MAC protocol data unit (MPDU) can be correctly extracted from a received PHY protocol data unit (PPDU), a header field of the MPDU, that is, a duration/ID field, is analyzed, and the medium is deemed to be in the busy state during a scheduled time for using the medium. Stations determine whether the medium is in the busy state by using the two carrier sensing methods, and do not access the medium if in the busy state.
Referring to FIG. 1 , a MAC header of a frame transmitted through a general IEEE 802.11 compliant wireless LAN includes duration information indicating a time between when the frame is transmitted and when an ACK frame is received to confirm that the frame is received. After receiving the frame, the stations analyze the MAC header so that medium access is not tried for a duration of time, thereby avoiding collision. According to a feature of a wireless medium, all stations connected through the wireless LAN can physically receive all frames transmitted in a radio wave coverage area even if the frame is sent to a particular station.
In FIG. 1 , a frame exchange sequence is shown in which a single MPDU and an ACK frame are involved. However, a plurality of MPDUs may be included in the single PPDU as shown in FIG. 2A . Referring to FIG. 2A , a transmitting station and a receiving station exchange a request-to-send (RTS) frame with a clear-to-send (CTS) frame so that other stations do not access the medium for a predetermined time. The time obtained by the transmitting station when using an RTS/CTS exchange sequence is referred to as a transmission opportunity (TxOP). A network allocation vector (NAV) is a remaining time until the medium is available. Stations, except for the transmitting station and the receiving station, determine their NAV times using duration fields of a RTS frame, a CTS frame, and a data frame. Referring to FIG. 2A , the transmitting station sends a plurality of MPDUs included in a single PPDU. Furthermore, the transmitting station sends a plurality of PPDUs within a TxOP obtained by one RTS/CTS exchange sequence. In this case, data having a size larger than that of the general case of FIG. 1 is transmitted, and thus if an error occurs, more time is required to retransmit the data, thereby causing a longer NAV. If the longer NAV is determined, even when the transmitting station has no data to be sent, other stations do not access the medium for the remaining TxOP, which may cause a waste of channels. To avoid this, the transmitting station sends a Contention-Free-End (CF-End) frame. This is illustrated in FIG. 2B . If the TxOP is still left but the medium is no longer used, the transmitting station sends the CF-End frame to cancel the remaining TxOP. Thereafter, other stations which receive the CF-End frame contend again for medium access.
As described above, in virtual carrier sensing, the CSMA/CA can be effectively used only when the MAC protocol data unit/PHY service data unit (MPDU/PSDU) are analyzed without errors. That is, virtual carrier sensing can be carried out only when a MAC header value can be correctly read. However, if data is sent using a high data transfer rate and an error occurs due to an unstable channel condition, or a receiving station cannot cope with the high data transfer speed, virtual carrier sensing cannot be carried out because the received MPDU/PSDU cannot be analyzed. Therefore, the CSMA/CA method becomes ineffective. Accordingly, when a legacy station which operates in accordance with the IEEE 802.11 a/b/g standard and a high throughput (HT) station having a higher capability than the legacy station coexist in the wireless LAN, and when a HT format is sent, the legacy station cannot analyze the HT format frame, causing ineffective operation of a CSMA/CA mechanism. The HT station may be a multi-input-multi-output (MIMO) station which has data transferring capability superior to a station operating in accordance with the 802.11 a/b/g standard.
In order to solve the above problems, an IEEE 802.11n standard has been in development. Referring to FIG. 3A , in the 802.11n standard, if HT stations and legacy stations coexist in the wireless LAN, a PHY header of the HT format frame is used as a legacy format (L-Preamble, L-SIG) so as to be recognized by the legacy stations. In addition, a RATE field value and a LENGTH field value are determined so that the legacy stations can recognize a time required after an L-SIG field begins and until an ACK frame is received, by analyzing the RATE field and the LENGTH field included in the PHY header. Hereinafter, the time specified by the RATE field and the LENGTH field will be referred to as an extended PHY protection (EPP).
When the EPP is used, medium access collision can be avoided, but stations have to contend unfairly to attain permission for medium access.
Referring to FIG. 3B , which illustrates the above problem, even if a legacy station can read the PHY header, the legacy station cannot read the next fields, that is, HT format, which leads to an error. Then, the PHY, or baseband layer, indicates the error occurrence to the MAC layer. The error indication begins where the EPP ends. From this point, the legacy station participates in contention for medium access after waiting for a longer time than the HT station. When an error occurs because the legacy station cannot read the HT format frame, the legacy station starts to back-off after standing by for a time defined in extended inter-frame space (EIFS, 94 us in IEEE 802.11a). This is different from the HT station which starts to back-off after standing by for a time corresponding to Distributed Coordination Function (DCF) inter-frame space (DIFS, 34 us in IEEE 802.11a).
Accordingly, correct CSMA/CA can be carried out in the wireless LAN by using the CF-End frame, thereby ensuring a fair contention among stations. However, if the CF-End frame is not sent to all stations included in the wireless LAN, such advantages cannot be attained. As shown in FIG. 4 , a hidden node problem may occur in the wireless LAN. In FIG. 4 , a station A broadcasts a frame. Radio wave coverage of each station is indicated by a dotted line. Referring to FIG. 4 , according to a feature of the wireless LAN, a station C can recognize a frame sent from the station A, but a station B may not recognize the frame. In this case, if the station B mistakenly recognizes that a medium is available by carrier sensing and thus tries to send the frame, medium access collision occurs.
Exemplary embodiments of the present invention overcome the above disadvantages and other disadvantages not described above. Also, the present invention is not required to overcome the disadvantages described above, and an exemplary embodiment of the present invention may not overcome any of the problems described above.
The present invention provides a method and apparatus which allow stations connected in a wireless LAN to receive a control frame having information regarding media access.
According to an aspect of the present invention, there is provided a method of delivering a control frame for a device which communicates through a wireless LAN, the method comprising receiving a control frame including time information for controlling medium access, checking recipient address information included in the control frame, and broadcasting the received control frame in a selective manner based on the checking result.
In the aforementioned aspect of the present invention, the control frame may be a CF-End frame, and in the broadcasting the received control frame, if the checking result indicates that a basic service set ID (BSSID) recorded in the CF-End frame coincides with a BSSID of a BSS (basic service set), the CF-End frame may be broadcast.
In addition, in the broadcasting the received control frame, when a time of SIFS short inter-frame space (SIFS) elapses after the CF-End frame is received in the receiving a control frame, the received CF-End frame may be broadcast.
In addition, if the wireless LAN is an infrastructure BSS, the device is an access point of the infrastructure BSS, and the wireless LAN is an IBSS (independent BSS), then the device may be an IBSS control station that sends a beacon frame.
According to another aspect of the present invention, there is provided a computer-readable medium having embodied thereon a computer program for executing the method above.
According to another aspect of the present invention, there is provided an apparatus for delivering a control frame received through a wireless LAN, the apparatus comprising a recipient address information checking unit which checks recipient address information included in the control frame when the control frame including time information for medium access is received, and a resending unit which broadcasts the received control frame in a selective manner based on the checking result.
According to another aspect of the present invention, there is provided an access point having the apparatus above.
According to another aspect of the present invention, there is provided a wireless LAN station which has the apparatus above, and operates the apparatus only when the wireless LAN station operates as an IBSS control station that sends a beacon frame in the independent BSS.
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:
Although the case where a control CF-End frame is used so that the transmitting station returns the TxOP has been described, the present exemplary embodiment is not limited thereto, and other types of frames may be used if the frames have a function for resetting the NAV of each station, and if a duration field of each MAC header thereof is set to 0. The same will be also applied hereinafter.
Referring to FIG. 6 , if a station B is a hidden node that cannot receive a CF-End frame sent from a station A, a station C delivers the CF-End frame sent from station A to station B. That is, the CF-End frame that is broadcast by station A is broadcast again by station C, and station B receives the CF-End frame that is broadcast by station C. In this case, it is desirable that the station B rebroadcasts the CF-End frame when the short inter-frame space (SIFS) elapses after the CF-End frame sent from station A is received. If an elapsed time is longer than the SIFS, another station which has received the CF-End frame may determine that the medium is available and may try to send the CF-End frame.
Station C is not allowed to resend all received CF-End frames. Medium access control (MAC) of each station is performed for a medium used in one BSS. Thus, if station C is located in a position in which frames sent from two or more different BSSs can be received, an error may occur during the MAC of the stations.
Therefore, when station C receives the CF-End frame, station C reads its address field to compare a basic service set ID (BSSID) of the CF-End frame with a BSSID of a BSS in which station C is included. Then, only when the two BSSIDs coincide with each other, station C resends the CF-End frame. Otherwise, station C drops the CF-End frame. FIG. 7 illustrates a configuration of the CF-End frame.
An access point or an IBSS control station receives a CF-End frame (operation 710), and then compares an BSSID recorded in an address field of the received CF-End frame with a BSSID of a BSS where the access point or the IBSS is included (operation 720). If the BSSID recorded in the address field of the CF-End frame coincides with the BSSID of the BSS where the access point or the IBSS is included, the access point or the IBSS rebroadcasts the received CF-End frame so that the CF-End frame can be delivered to a hidden node of the BSS where the access point or the IBSS is included (operation 740). Otherwise, the access point or the IBSS drops the CF-End frame (operation 730).
Referring to FIG. 9 , an apparatus 800 for delivering a CF-End frame to a hidden node includes a recipient address information checking unit 800 and a resending unit 820. In the present exemplary embodiment, it is assumed that the apparatus 800 is included in an access point 870, but the apparatus 800 may be included in an IBSS control station sending a beacon frame, as described above.
The recipient address information checking unit 800 receives the CF-End frame sent from a first station 850, and then compares a BSSID recorded in an address field of the received CF-End frame with a BSSID of a BSS which is controlled by the access point 870. If the two BSSIDs do not coincide with each other, the recipient address information checking unit 800 drops the CF-End frame.
If the BSSID recorded in the address field of the received CF-End frame coincides with the BSSID of the BSS which is controlled by the access point 870, the resending unit 820 broadcasts the received CF-End frame so that the CF-End frame can be delivered to a second station 860 that is a hidden node.
Accordingly, in the present invention, all stations included in one BSS can receive the same time information for controlling medium access, thereby solving a hidden node problem. Ultimately, a correct CSMA/CA mechanism can be implemented in a wireless LAN, and a fair contention for medium access among the stations can be ensured.
The exemplary embodiments of the present invention can be written as computer programs which are embodied on computer readable recording media and can be implemented in general-use digital computers that execute the programs using computer readable recording media. Examples of the computer readable recording media include magnetic storage media (e.g., ROM, floppy disks, hard disks, etc.), optical recording media (e.g., CD-ROMs, or DVDs), and storage media such as carrier waves (e.g., transmission through the Internet).
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. The exemplary embodiments should be considered in descriptive sense only and not for purposes of limitation. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.
Claims (13)
1. A method of delivering transmitting a control Contention Free-End (CF-End) frame for a device which communicates through a wireless local area network (LAN), the method comprising steps performed by a first station of:
receiving a control frame including time information for controlling medium access and recipient address information;
checking recipient address information a Basic Service Set ID (BSSID) included in a CF-End frame, the CF-End frame including a duration field of a MAC header set to zero; and
broadcasting the received control frame in a selective manner based on a checking result, to a second station, the CF-End frame directly in response to determining the Basic Service Set ID (BSSID) in the CF-End frame matches a BSSID of a Basic Service Set (BSS) where said first station is included, wherein the step of broadcasting the CF-End frame to said second station comprises the step of broadcasting the CF-End frame when a Short Inter Frame Space (SIFS) elapses after the CF-End frame was received, and
wherein, in the control frame, a duration field of a MAC (medium access control) header has a value of 0,
wherein the control frame is a Contention-Free-End (CF-End) frame,
wherein the broadcasting the received control frame comprises broadcasting the received CF-END frame if the checking result indicates that a basic service set ID (BSSID) recorded in the CF-End frame coincides with a BSSID of a BSS (basic service set), and
wherein the broadcasting the received control frame further comprises broadcasting the received CF-END frame when a short inter-frame space (SIFS) elapses after the CF-End frame is received wherein a Network Allocation Vector (NAV) of said second station is reset upon a receipt of the CF-End frame.
2. The method of claim 1 , wherein the said wireless LAN is an infrastructure BSS, and the device said first station is an access point of the said infrastructure BSS.
3. A non-transitory computer-readable medium having embodied thereon a computer program for executing the method of claim 2 .
4. The method of claim 1 , wherein the said wireless LAN is an IBSS (independent BSS (IBSS), and the device said first station is an IBSS control station that sends configured to send a beacon frame.
5. A non-transitory computer-readable medium having embodied thereon a computer program for executing the method of claim 4 .
6. A non-transitory computer-readable medium having embodied thereon a computer program for executing the method of claim 1 .
7. An apparatus for delivering transmitting a control Contention Free-End (CF-End) frame received through a wireless LAN, the apparatus comprising:
a recipient address information checking unit which checks recipient address information receiver configured to check a Basic Service Set ID (BSSID) included in the control a CF-End frame when the control frame including time information for medium access is received, the CF-End frame including a duration field of a MAC header set to zero; and
a resending unit which broadcasts the received control transmitter configured to broadcast the CF-End frame in a selective manner based on the checking result, directly in response to determining the Basic Service Set ID in the CF-End frame matches a BSSID of a Basic Service Set (BSS) where the apparatus is included, wherein said transmitter is configured to broadcast the CF-End frame when a Short Inter Frame Space (SIFS) elapses after the CF-End frame was received, and
wherein, in the control frame, a duration field of a MAC header has a value of 0, wherein the control frame is a CF-End frame,
wherein, the resending unit broadcasts the CF-End frame if the checking result indicates that a recipient address recorded in the CF-End frame is a broadcast address, and a BSSID recorded in the CF-End frame coincides with a BSSID of a BSS (basic service set), and
wherein, the resending unit broadcasts the received CF-End frame when a SIFS elapses after the CF-End frame wherein a Network Allocation Vector (NAV) of a recipient of the CF-End frame is reset upon a receipt of the CF-End frame.
8. An access point comprising the apparatus of claim 7 .
9. A wireless LAN station which comprises the apparatus of claim 7 , and operates is configured to operate the apparatus only when the wireless LAN station operates as an IBSS independent BSS control station that sends configured to send a beacon frame in the independent BSS.
10. The method of claim 1, wherein the CF-End frame is transmitted by said first station to indicate a completion of a transmission opportunity of said first station.
11. The method of claim 10, wherein another station that receives the CF-End frame resets a Network Allocation Vector (NAV) so said another station is operable to contend for medium access.
12. The apparatus of claim 7, wherein said apparatus is configured to transmit the CF-End frame to indicate a completion of a transmission opportunity.
13. The apparatus of claim 12, wherein another station that is configured to receive the CF-End frame is configured to reset a Network Allocation Vector (NAV) so said another station is operable to contend for medium access.
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Families Citing this family (61)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007056747A2 (en) * | 2005-11-08 | 2007-05-18 | Conexant Systems | Collision avoidance systems and methods |
US8031661B2 (en) * | 2005-11-08 | 2011-10-04 | Intellectual Ventures I Llc | Symmetric transmit opportunity (TXOP) truncation |
US7920536B1 (en) * | 2006-10-20 | 2011-04-05 | Marvell International Ltd. | More robust data transfer through detection of hidden nodes |
JP5075526B2 (en) * | 2007-08-10 | 2012-11-21 | 株式会社東芝 | Wireless communication device and control program for wireless communication device |
US20090129333A1 (en) * | 2007-11-16 | 2009-05-21 | Qualcomm Incorporated | Preamble design for a wireless signal |
US9215669B2 (en) * | 2007-11-16 | 2015-12-15 | Qualcomm Incorporated | Preamble design for a wireless signal |
US9264976B2 (en) * | 2007-11-16 | 2016-02-16 | Qualcomm Incorporated | Preamble design for a wireless signal |
US8918112B2 (en) * | 2007-11-16 | 2014-12-23 | Qualcomm Incorporated | Preamble design for a wireless signal |
US9801188B2 (en) * | 2008-02-01 | 2017-10-24 | Qualcomm Incorporated | Backhaul signaling for interference avoidance |
US8768372B2 (en) * | 2008-02-13 | 2014-07-01 | Qualcomm Incorporated | Sector interference management based on inter-sector performance |
US8737281B2 (en) | 2008-06-18 | 2014-05-27 | Thomson Licensing | Apparatus for multicast transmissions in wireless local area networks |
CN102067634B (en) | 2008-06-18 | 2014-08-20 | 汤姆森特许公司 | Contention-based medium reservation method and apparatus for multicast transmissions in wireless local area networks |
US8462686B2 (en) | 2008-06-23 | 2013-06-11 | Thomson Licensing | Apparatus for collision mitigation of multicast transmissions in wireless networks |
CN102067515B (en) | 2008-06-23 | 2015-02-04 | 汤姆森特许公司 | Collision mitigation for multicast transmission in wireless local area networks |
CA2727473C (en) | 2008-06-26 | 2016-11-15 | Thomson Licensing | Apparatus for requesting acknowledgement and transmitting acknowledgement of multicast data in wireless local area networks |
KR101451247B1 (en) | 2008-06-26 | 2014-10-15 | 톰슨 라이센싱 | Method and apparatus for acknowledgement and retransmission of multicast data in wireless local area networks |
WO2010076481A1 (en) * | 2008-12-15 | 2010-07-08 | France Telecom | Method for transmitting data by a wireless network unit and unit |
JP2010252049A (en) * | 2009-04-15 | 2010-11-04 | Sony Corp | Communication apparatus, communication method, computer program, and communication system |
CN101895964B (en) * | 2009-05-21 | 2013-03-20 | 鸿富锦精密工业(深圳)有限公司 | Mobile station and method for scanning service group identification code by mobile station |
US9173191B2 (en) | 2009-12-20 | 2015-10-27 | Intel Corporation | Device, system and method of simultaneously communicating with a group of wireless communication devices |
US9119110B2 (en) * | 2010-09-22 | 2015-08-25 | Qualcomm, Incorporated | Request to send (RTS) and clear to send (CTS) for multichannel operations |
US11026169B2 (en) * | 2010-11-09 | 2021-06-01 | Qualcomm Incorporated | Physical layer power save facility |
US9992738B2 (en) | 2010-11-17 | 2018-06-05 | Qualcomm Incorporated | Physical layer power save facility with random offset |
KR101517321B1 (en) | 2011-06-08 | 2015-05-04 | 엘지전자 주식회사 | Method and device for transmitting a frame using a multiple physical layer in a wireless lan system |
EP2724587B1 (en) | 2011-06-24 | 2018-04-11 | Interdigital Patent Holdings, Inc. | Method and apparatus for supporting wideband and multiple bandwidth transmission protocols |
US9807796B2 (en) * | 2011-09-02 | 2017-10-31 | Qualcomm Incorporated | Systems and methods for resetting a network station |
CN103002591B (en) * | 2011-09-15 | 2015-09-30 | 华为技术有限公司 | A kind of the method for NAV control, device, system and node are carried out to node |
JP2013093717A (en) * | 2011-10-25 | 2013-05-16 | Fujitsu Ltd | Radio station, communication system, and communication method |
US8767862B2 (en) | 2012-05-29 | 2014-07-01 | Magnolia Broadband Inc. | Beamformer phase optimization for a multi-layer MIMO system augmented by radio distribution network |
US8644413B2 (en) | 2012-05-29 | 2014-02-04 | Magnolia Broadband Inc. | Implementing blind tuning in hybrid MIMO RF beamforming systems |
US8619927B2 (en) | 2012-05-29 | 2013-12-31 | Magnolia Broadband Inc. | System and method for discrete gain control in hybrid MIMO/RF beamforming |
US8649458B2 (en) | 2012-05-29 | 2014-02-11 | Magnolia Broadband Inc. | Using antenna pooling to enhance a MIMO receiver augmented by RF beamforming |
US9154204B2 (en) | 2012-06-11 | 2015-10-06 | Magnolia Broadband Inc. | Implementing transmit RDN architectures in uplink MIMO systems |
CN103581124B (en) * | 2012-07-26 | 2017-04-12 | 联发科技股份有限公司 | Management frame handling method and related communication device thereof |
AU2013332687B2 (en) * | 2012-10-18 | 2016-01-28 | Lg Electronics Inc. | Method and apparatus for channel access in wireless LAN system |
GB2507278A (en) * | 2012-10-23 | 2014-04-30 | Broadcom Corp | Generating a control message frame to instruct the end of a contention-free period |
US8797969B1 (en) | 2013-02-08 | 2014-08-05 | Magnolia Broadband Inc. | Implementing multi user multiple input multiple output (MU MIMO) base station using single-user (SU) MIMO co-located base stations |
US9343808B2 (en) | 2013-02-08 | 2016-05-17 | Magnotod Llc | Multi-beam MIMO time division duplex base station using subset of radios |
US8989103B2 (en) | 2013-02-13 | 2015-03-24 | Magnolia Broadband Inc. | Method and system for selective attenuation of preamble reception in co-located WI FI access points |
US9155110B2 (en) | 2013-03-27 | 2015-10-06 | Magnolia Broadband Inc. | System and method for co-located and co-channel Wi-Fi access points |
US20140226740A1 (en) | 2013-02-13 | 2014-08-14 | Magnolia Broadband Inc. | Multi-beam co-channel wi-fi access point |
CN104125648B (en) | 2013-04-24 | 2017-06-20 | 华为技术有限公司 | A kind of website dispatching method and equipment |
US9100968B2 (en) | 2013-05-09 | 2015-08-04 | Magnolia Broadband Inc. | Method and system for digital cancellation scheme with multi-beam |
US9425882B2 (en) | 2013-06-28 | 2016-08-23 | Magnolia Broadband Inc. | Wi-Fi radio distribution network stations and method of operating Wi-Fi RDN stations |
US8995416B2 (en) | 2013-07-10 | 2015-03-31 | Magnolia Broadband Inc. | System and method for simultaneous co-channel access of neighboring access points |
US9497781B2 (en) * | 2013-08-13 | 2016-11-15 | Magnolia Broadband Inc. | System and method for co-located and co-channel Wi-Fi access points |
US9088898B2 (en) | 2013-09-12 | 2015-07-21 | Magnolia Broadband Inc. | System and method for cooperative scheduling for co-located access points |
US9060362B2 (en) | 2013-09-12 | 2015-06-16 | Magnolia Broadband Inc. | Method and system for accessing an occupied Wi-Fi channel by a client using a nulling scheme |
US9172454B2 (en) | 2013-11-01 | 2015-10-27 | Magnolia Broadband Inc. | Method and system for calibrating a transceiver array |
US8891598B1 (en) | 2013-11-19 | 2014-11-18 | Magnolia Broadband Inc. | Transmitter and receiver calibration for obtaining the channel reciprocity for time division duplex MIMO systems |
US8942134B1 (en) | 2013-11-20 | 2015-01-27 | Magnolia Broadband Inc. | System and method for selective registration in a multi-beam system |
US8929322B1 (en) | 2013-11-20 | 2015-01-06 | Magnolia Broadband Inc. | System and method for side lobe suppression using controlled signal cancellation |
US9014066B1 (en) | 2013-11-26 | 2015-04-21 | Magnolia Broadband Inc. | System and method for transmit and receive antenna patterns calibration for time division duplex (TDD) systems |
US9294177B2 (en) | 2013-11-26 | 2016-03-22 | Magnolia Broadband Inc. | System and method for transmit and receive antenna patterns calibration for time division duplex (TDD) systems |
US9042276B1 (en) | 2013-12-05 | 2015-05-26 | Magnolia Broadband Inc. | Multiple co-located multi-user-MIMO access points |
EP3089395B1 (en) | 2014-01-21 | 2021-09-22 | Huawei Technologies Co., Ltd. | Data transmission method and device |
US9100154B1 (en) | 2014-03-19 | 2015-08-04 | Magnolia Broadband Inc. | Method and system for explicit AP-to-AP sounding in an 802.11 network |
US9172446B2 (en) | 2014-03-19 | 2015-10-27 | Magnolia Broadband Inc. | Method and system for supporting sparse explicit sounding by implicit data |
US9271176B2 (en) | 2014-03-28 | 2016-02-23 | Magnolia Broadband Inc. | System and method for backhaul based sounding feedback |
CN104581979B (en) * | 2014-12-23 | 2018-05-15 | 江苏中兴微通信息科技有限公司 | A kind of RTS collision solution methods based on fair competition |
US10980061B2 (en) * | 2016-01-06 | 2021-04-13 | Sony Corporation | Information processing apparatus, communication system, information processing method, and program |
Citations (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0986214A2 (en) | 1998-09-11 | 2000-03-15 | Sony Corporation | Communication control method and transmission apparatus |
JP2002217913A (en) | 2001-01-23 | 2002-08-02 | Hitachi Kokusai Electric Inc | Wireless lan system |
US20020115458A1 (en) * | 2001-02-21 | 2002-08-22 | Nippon Telegraph And Telephone Corporation | Radio communication system |
US20020141368A1 (en) | 1994-07-29 | 2002-10-03 | Roger Y M. Cheung | Method and apparatus for connecting a wireless lan to a wired lan |
US20020152324A1 (en) | 2001-01-16 | 2002-10-17 | Sherman Matthew J. | Interference suppression methods for 802.11 |
US20020150095A1 (en) * | 2001-01-16 | 2002-10-17 | Sherman Matthew J. | Interference suppression methods for 802.11 |
WO2003005653A1 (en) | 2001-07-05 | 2003-01-16 | At & T Corp. | Hybrid coordination function (hcf) access through tiered contention and overlapped wireless cell mitigation |
JP2003018234A (en) | 2001-07-05 | 2003-01-17 | Hitachi Kokusai Electric Inc | Radio system |
JP2003174452A (en) | 2001-09-28 | 2003-06-20 | Toshiba Corp | Radio communication system and radio communication terminal |
US20040181597A1 (en) * | 2003-03-13 | 2004-09-16 | Randy L. Ekl | Efficient peer-to-peer transmission in an infrastructure environment |
JP2004535695A (en) | 2001-03-02 | 2004-11-25 | エイ・ティ・アンド・ティ・コーポレーション | Interference suppression method for 802.11 |
JP2005513915A (en) | 2001-12-20 | 2005-05-12 | クラナイト システムズ インク | Personal virtual bridge local area network |
JP2005223767A (en) | 2004-02-06 | 2005-08-18 | Sony Corp | Radio communication system, radio communication apparatus and method, and computer program |
WO2005109764A1 (en) | 2004-05-07 | 2005-11-17 | Matsushita Electric Industrial Co., Ltd. | Wireless node apparatus, and multihop wireless lan system |
US7016948B1 (en) * | 2001-12-21 | 2006-03-21 | Mcafee, Inc. | Method and apparatus for detailed protocol analysis of frames captured in an IEEE 802.11 (b) wireless LAN |
US20070115853A1 (en) * | 2005-11-08 | 2007-05-24 | Conexant Systems | Collision Avoidance Systems and Methods |
US20070115882A1 (en) * | 2005-11-08 | 2007-05-24 | Conexant Systems, Inc | Symmetric transmit opportunity (TXOP) truncation |
US20070171858A1 (en) * | 2006-01-04 | 2007-07-26 | Interdigital Technology Corporation | Methods and systems for providing efficient operation of multiple modes in a wlan system |
US7269153B1 (en) * | 2002-05-24 | 2007-09-11 | Conexant Systems, Inc. | Method for minimizing time critical transmit processing for a personal computer implementation of a wireless local area network adapter |
US20080095095A1 (en) | 2001-09-28 | 2008-04-24 | Kabushiki Kaisha Toshiba | Radio communication system, terminal and packet |
US20110310872A1 (en) | 2001-12-20 | 2011-12-22 | Microsoft Corporation | Public access point |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100427803B1 (en) * | 2001-06-05 | 2004-04-27 | (주)다보링크 | Method and Apparatus for Controlling QoS for Voice over Internet Protocol |
US7570656B2 (en) * | 2001-06-18 | 2009-08-04 | Yitran Communications Ltd. | Channel access method for powerline carrier based media access control protocol |
KR100560738B1 (en) * | 2003-07-29 | 2006-03-13 | 삼성전자주식회사 | method for medium access control in wireless local area network system based on carrier sense multiple access with collision avoidance and station thereof |
-
2006
- 2006-04-10 KR KR1020060032408A patent/KR100728039B1/en active IP Right Grant
- 2006-11-15 US US11/599,419 patent/US7944874B2/en active Active
- 2006-12-21 EP EP13155600.3A patent/EP2595443B1/en active Active
- 2006-12-21 WO PCT/KR2006/005609 patent/WO2007078073A1/en active Application Filing
- 2006-12-21 EP EP06835313.5A patent/EP1969771B1/en active Active
- 2006-12-21 CN CN2006800505599A patent/CN101356772B/en active Active
- 2006-12-21 JP JP2008549411A patent/JP5209497B2/en active Active
- 2006-12-21 EP EP17194681.7A patent/EP3288331B1/en active Active
-
2013
- 2013-05-16 US US13/895,958 patent/USRE47579E1/en active Active
Patent Citations (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020141368A1 (en) | 1994-07-29 | 2002-10-03 | Roger Y M. Cheung | Method and apparatus for connecting a wireless lan to a wired lan |
EP0986214A2 (en) | 1998-09-11 | 2000-03-15 | Sony Corporation | Communication control method and transmission apparatus |
US20020152324A1 (en) | 2001-01-16 | 2002-10-17 | Sherman Matthew J. | Interference suppression methods for 802.11 |
US20090187661A1 (en) | 2001-01-16 | 2009-07-23 | Sherman Matthew J | Interference suppression methods for 802.11 |
US20020150095A1 (en) * | 2001-01-16 | 2002-10-17 | Sherman Matthew J. | Interference suppression methods for 802.11 |
US20060041676A1 (en) * | 2001-01-16 | 2006-02-23 | Sherman Matthew J | Interference suppression methods for 802.11 |
JP2002217913A (en) | 2001-01-23 | 2002-08-02 | Hitachi Kokusai Electric Inc | Wireless lan system |
US20020115458A1 (en) * | 2001-02-21 | 2002-08-22 | Nippon Telegraph And Telephone Corporation | Radio communication system |
JP2004535695A (en) | 2001-03-02 | 2004-11-25 | エイ・ティ・アンド・ティ・コーポレーション | Interference suppression method for 802.11 |
WO2003005653A1 (en) | 2001-07-05 | 2003-01-16 | At & T Corp. | Hybrid coordination function (hcf) access through tiered contention and overlapped wireless cell mitigation |
JP2003018234A (en) | 2001-07-05 | 2003-01-17 | Hitachi Kokusai Electric Inc | Radio system |
JP2003174452A (en) | 2001-09-28 | 2003-06-20 | Toshiba Corp | Radio communication system and radio communication terminal |
US20080095095A1 (en) | 2001-09-28 | 2008-04-24 | Kabushiki Kaisha Toshiba | Radio communication system, terminal and packet |
JP2005513915A (en) | 2001-12-20 | 2005-05-12 | クラナイト システムズ インク | Personal virtual bridge local area network |
US20110310872A1 (en) | 2001-12-20 | 2011-12-22 | Microsoft Corporation | Public access point |
US7016948B1 (en) * | 2001-12-21 | 2006-03-21 | Mcafee, Inc. | Method and apparatus for detailed protocol analysis of frames captured in an IEEE 802.11 (b) wireless LAN |
US7269153B1 (en) * | 2002-05-24 | 2007-09-11 | Conexant Systems, Inc. | Method for minimizing time critical transmit processing for a personal computer implementation of a wireless local area network adapter |
US20040181597A1 (en) * | 2003-03-13 | 2004-09-16 | Randy L. Ekl | Efficient peer-to-peer transmission in an infrastructure environment |
JP2005223767A (en) | 2004-02-06 | 2005-08-18 | Sony Corp | Radio communication system, radio communication apparatus and method, and computer program |
US20070291679A1 (en) | 2004-05-07 | 2007-12-20 | Matsushita Electric Industrial Co., Ltd. | Wireless Node Apparatus, and Multihop Wireless Lan System |
WO2005109764A1 (en) | 2004-05-07 | 2005-11-17 | Matsushita Electric Industrial Co., Ltd. | Wireless node apparatus, and multihop wireless lan system |
US20070115882A1 (en) * | 2005-11-08 | 2007-05-24 | Conexant Systems, Inc | Symmetric transmit opportunity (TXOP) truncation |
US20070115853A1 (en) * | 2005-11-08 | 2007-05-24 | Conexant Systems | Collision Avoidance Systems and Methods |
US20070171858A1 (en) * | 2006-01-04 | 2007-07-26 | Interdigital Technology Corporation | Methods and systems for providing efficient operation of multiple modes in a wlan system |
Non-Patent Citations (12)
Title |
---|
"Adaptive Random Access Scheme based on Traffic Load and QoS in a Wireless Communication System"; Ki-Ho Lee and Doug-Ho Cho; Vehicular Technology Conference, 2003, VTC 2003-Spring, The 57th IEEE Semiannual, vol. 3, Apr. 22-35, 2003 pp. 1793-1797. |
"MiFi: A framework for Fairness and QoS Assurance in Current IEEE 802.11 Networks with Multiple Access Points"; Bejerano, Y. and Bhatia, R. S.; INFOCOM 2004. Twenty-third Annual Joint Conference of the IEEE Computer and Communications Societies, vol. 2, Mar. 7-11, 2004 pp. 1229-1240. |
ANSI/IEEE, "Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications", Adopted by the ISO/IEC and redesignated as ISO/IEC 8802-11:1999(E), Aug. 20, 1999, total 527 pages, ANSI/IEEE Std 802.11, 1999 Edition. |
Communication dated Dec. 8, 2017, from the European Patent Office in counterpart European Application No. 17194681.7. |
Communication dated Jun. 9, 2017 issued by the European Patent Office in counterpart European Patent Application No. 06835313.5. |
Communication dated Jun. 9, 2017 issued by the European Patent Office in counterpart European Patent Application No. 13155600.3. |
Hao Zhu et al. "rDCF: A Relay-enabled Medium Access Control Protocol for Wireless Ad Hoc Networks" INFOCOM 2005. 24th Annual Joint Conference of the IEEE computer and communications societies. Proceedings IEEE Miami, FL, USA Mar. 13-17, 2005, Piscataway, NJ, USA, vol. 1, Mar. 13, 2005, (pp. 12-22) XP010829047. |
HAO ZHU, GUOHONG CAO: "/spl gamma/DCF: A relay-enabled medium access control protocol for wireless ad hoc networks", INFOCOM 2005. 24TH ANNUAL JOINT CONFERENCE OF THE IEEE COMPUTER AND CO MMUNICATIONS SOCIETIES. PROCEEDINGS IEEE MIAMI, FL, USA 13-17 MARCH 2005, PISCATAWAY, NJ, USA,IEEE, PISCATAWAY, NJ, USA, vol. 1, 13 March 2005 (2005-03-13) - 17 March 2005 (2005-03-17), Piscataway, NJ, USA, pages 12 - 22, XP010829047, ISBN: 978-0-7803-8968-7, DOI: 10.1109/INFCOM.2005.1497874 |
IEEE, "Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, High-speed Physical Layer in the 5 GHz Band", Reaffirmed Jun. 12, 2003, total 91 pages, IEEE Std 802.11a-1999(R2003). |
Ki-Ho Lee and Dong-Ho Cho: A Multiple Access Collision Avoidance Protocol for Multicast Services in Mobile Ad Hoc Networks; Vehicular Technology Conference, 2003; The 57th IEEE Semiannual; IEEE Communications Letters. |
Kohei Mizuno; "A Multichannel Media Access Control Protocol for Multihop Wireless Networks with Guaranteed Functions"; Electronics and Communications in Japan, Part 1, vol. 87, No. 4; 2004; Translated from Denshi Joho Tsushin Gakkai Ronbunshi, vol. J85-B, No. 12, Dec. 2002, pp. 2179-2188; 14 pgs. |
Michael Cloran; "Simulation of IEEE 802.11 PCF function in GIMoSim"; Dublin City University School of Electronic Engineering; Apr. 2004; 47 pgs. |
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KR100728039B1 (en) | 2007-06-14 |
US20070217352A1 (en) | 2007-09-20 |
EP1969771A1 (en) | 2008-09-17 |
EP3288331B1 (en) | 2019-09-25 |
EP1969771B1 (en) | 2017-11-15 |
EP2595443A1 (en) | 2013-05-22 |
US7944874B2 (en) | 2011-05-17 |
WO2007078073A1 (en) | 2007-07-12 |
JP2009522910A (en) | 2009-06-11 |
CN101356772B (en) | 2011-06-15 |
EP3288331A1 (en) | 2018-02-28 |
CN101356772A (en) | 2009-01-28 |
EP1969771A4 (en) | 2012-10-03 |
JP5209497B2 (en) | 2013-06-12 |
EP2595443B1 (en) | 2017-11-15 |
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