US20150023340A1 - Method for Transmitting Frames in a Wireless Local Area Network - Google Patents
Method for Transmitting Frames in a Wireless Local Area Network Download PDFInfo
- Publication number
- US20150023340A1 US20150023340A1 US14/511,572 US201414511572A US2015023340A1 US 20150023340 A1 US20150023340 A1 US 20150023340A1 US 201414511572 A US201414511572 A US 201414511572A US 2015023340 A1 US2015023340 A1 US 2015023340A1
- Authority
- US
- United States
- Prior art keywords
- frame
- field
- address
- access point
- repeater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
- H04L12/462—LAN interconnection over a bridge based backbone
- H04L12/4625—Single bridge functionality, e.g. connection of two networks over a single bridge
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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]
-
- 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
Abstract
On the case of receiving data frame from a station, the method of the present invention instructs the repeater to replace the content of the receiver address field by the address of the bridge when receiving the frame transmitted from the station, and then forwards the frames to the bridge. On the case of receiving a data frame transmitted from the bridge, the repeater can replace the content of transmitter address field by the address of the repeater itself, and then forwards the data frame to the station.
Description
- This application is a continuation application of and claims priority to application Ser. No. 10/775,882; the complete disclosure of which are hereby incorporated herein by reference for all purposes.
- 1. Field of the Invention
- The present invention relates to a method for transmitting frames in a wireless local area network and data structure for the same, and more particularly, to a method and data structure for a repeater in a wireless local area network to transmit frames according to the IEEE 802.11 protocol.
- 2. Description of the Related Art
- The IEEE 802.11 defines the format of data frame for wireless local area network.
FIG. 1 illustrates some important fields of a data frame defined in IEEE 802.11. The data frame includes four address fields for recording basic service set identifier (BSSID), source address (SA), destination address (DA), transmitter address (TA) and receiver address (RA). - The destination address can be a unique address or a broadcast address, which is the destination of the frame. The source address is the address of the station, which generates the frame. The transmitter address is the address of the station, which transmits the frame in wireless medium, and the transmitter is connected to an access point (AP) in a wireless distribution system. The receiver address is the address of the next station, which will receive the frame, and the receiver also connects to the access point in the wireless distribution system.
- The access point can be a bridge or a repeater. The bridge is used to connect the wireless local area network and the local area network such as ether network for sharing the Internet source. The repeater transmits signal in a circuitous manner to overcome the obstacle of the building so as to elongate the communication distance. Each station decides whether to receive a frame according to the content of the
address 1 field. A station will receive the frame if the content of theaddress 1 is the same as the address of the station itself, otherwise it will discard the frame. The receiver can transmit an acknowledgement frame to the address recorded in theaddress 2 field if necessary. -
FIG. 2A illustrates some important fields of adata frame 10 transmitted from a source station to a repeater, andFIG. 2B illustrates some important fields of a data frame 12 forwarded to a bridge by the repeater. As shown inFIG. 2A andFIG. 2B , the repeater must transform thedata frame 10 into data frame 12 before forwarding to the bridge. The logic value of the “To DS” field is set to 1 for indicating that the data frame 12 is transmitted to an access point (the bridge) of a distribution system, and the logic value of the “From DS” field is set to 1 for indicating that the data frame 12 is transmitted from an access point (the repeater). Theaddress 1 field records the receiver address (the address of the bridge), theaddress 2 field records the transmitter address (the address of the repeater), theaddress 3 field records the destination address and theaddress 4 field records the source address. - After receiving the data frame 12, the bridge will transmit an acknowledgement frame to the repeater according the address recorded in the
address 2 field of the data frame 12, and the repeater will transmit an acknowledgement frame to the source station according the address recorded in theaddress 2 field of thedata frame 10. To transform thedata frame 10 into data frame 12, the repeater must change the content of the “From DS” field, theaddress 1 field, theaddress 2 field, theaddress 3 field and theaddress 4 field. Additionally, the above-mentioned method is inconvenient to design and increases the cost, since the data frame 12, transmitted from the repeater to the bridge, completely uses 4 address fields to store the bridge address, the repeater address, the destination address and the source address, respectively. - The bridge must identify the type of the repeater before receiving data frame from or transmitting to the repeater. However, the repeater and the bridge made by different companies might use proprietary protocol to transmit or receive frames that increase the complexity for setting a bridge which does not conform to requirement of the market.
- The object of the present invention is to provide a method for transmitting frames in a wireless local area network and data structure for the same, which allows a station and a bridge to transmit frames without concerning the forwarding process performed by a repeater.
- In order to achieve the above-mentioned object, the present invention provides a method for transmitting frames in a wireless local area network and data structure for the same. The wireless local area network comprises repeater coupled to a station and a bridge. On the case of receiving data frame from a station, the repeater replaces the content of the receiver address field by the address of the bridge when receiving the frame transmitted from the station, and then forwards the frames to the bridge. On the case of receiving a data frame transmitted from the bridge, the repeater replaces the content of transmitter address field by the address of the repeater itself, and then forwards the data frame to the station.
- Compared with the prior art, the present invention possesses the following advantages:
-
- 1. During the forwarding process, the basic service set identifier (the address of the access point) of the data frame is the only one field to be changed by the repeater according to the present invention. However, there are five fields of the data frame to be changed according to the prior art, respectively.
- 2. When the bridge is receiving a data frame, the data frame can be regarded as one transmitted directed from the source station, without concerning the forwarding process performed by the repeater.
- 3. When the bridge is transmitting a data frame, the data frame can be regarded as one transmitted directly to the destination station, without concerning the forwarding process performed by the repeater.
- 4. The repeater using the present invention is adaptable for the access point which conforms to the IEEE 802.11.
- Other objects and advantages of the present invention will become apparent upon reading the following description and upon reference to the accompanying drawings in which:
-
FIG. 1 illustrates some important fields of a data frame defined in IEEE 802.11; -
FIG. 2A illustrates some important fields of a data frame transmitted from a source station to a repeater; -
FIG. 2B illustrates some important fields of a data frame forwarded to a bridge by a repeater; -
FIG. 3 is schematic diagram of a network; -
FIG. 4A illustrates some important fields of a data frame transmitted to a repeater by a station according to the present invention; -
FIG. 4B illustrates some important fields of a data frame transmitted to a bridge by a repeater according to the present invention; -
FIG. 5A illustrates some important fields of a data frame transmitted to a station by a bridge according to the present invention; and -
FIG. 5B illustrates some important fields of a data frame transmitted to a station by a repeater according to the present invention. -
FIG. 3 is a schematic diagram of anetwork 20. Thenetwork 20 comprises a bridge 22 (an access point), a repeater 24 (also an access point) wireless coupling with thebridge 22, astation 26 wireless coupling with therepeater 24 and astation 28 electrically connected thebridge 22. Thestation 26 belongs to the basic service set of therepeater 24, and thestation 28 is a remote station connecting the bridge by the local area network/wide area network. When thestation 26 needs to transmit a data to thestation 28, the data will be added with a header to form a data frame that is then transmitted to thestation 28 throughrepeater 24 andbridge 22. -
FIG. 4A illustrates some important fields of adata frame 40 transmitted to therepeater 24 by thestation 26 according to the present invention. The logic value of the first field (the “From DS” field) is set to 1, indicating that thedata frame 40 is transmitted to an access point (the repeater 24) of a distribution system. The logic value of the second field (the “To DS” field) is set to 0, indicating that thedata frame 40 is not transmitted from an access point of a distribution system. Theaddress 1 field records the BSSID of therepeater 24, theaddress 2 field records the address of thestation 26, theaddress 3 field records the address of thestation 28 and theaddress 4 field is not used. After receiving thedata frame 40, therepeater 24 will transmit an acknowledgement frame to thestation 26 according to the address recorded in theaddress 2 field of thedata frame 40. -
FIG. 4B illustrates some important fields of adata frame 42 transmitted to thebridge 22 by therepeater 24 according to the present invention. When receiving thedata frame 40 from thestation 26, therepeater 24 transforms thedata frame 40 intodata frame 42 by replacing the BSSID recorded in theaddress 1 field with the identifier of thebridge 22. As shown inFIG. 4B , the logic value of the first field and the second field is kept the same, theaddress 1 field for recording the receiver address is changed into the identifier of thebridge 22, the contents of theaddress 2 field and theaddress 3 field are kept the same and theaddress 4 field is still not used. When receiving thedata frame 42, thebridge 22 will transmit an acknowledgement frame to thestation 26 according to the address recorded in theaddress 2 field. Since thestation 26 belongs to the basic service set of therepeater 24, therepeater 24 receives the acknowledgement frame instead of thestation 26. However, therepeater 24 will not forward this acknowledgement frame to thestation 26 since therepeater 24 had transmitted an acknowledgement frame to thestation 26 when receiving thedata frame 40 from thestation 26 before. - Although the
data frame 42 is transmitted from an access point (the repeater 24) to another access point (the bridge 22), the present invention method only changes the content of theaddress 1 field, and keeps all the other fields of the data frame the same. Besides, only three address fields are used to record the BSSID of thebridge 22, the address of thestation 26 and the address of thestation 28. Therefore, when thebridge 22 received thedata frame 42, thedata frame 42 can be regarded as one transmitted directly from thesource station 26, not from therepeater 24. Besides, thebridge 22 also regards the acknowledgement frame as one transmitted directly to thestation 26, not to therepeater 22. -
FIG. 5A illustrates some important fields of adata frame 50 transmitted to thestation 26 by thebridge 22 according to the present invention. The logic value of the first field is set to 0, indicating that thedata frame 50 is not transmitted to an access point of a distribution system, and the logic value of the second field is set to 1, indicating that thedata frame 50 is transmitted from an access point of a distribution system. Theaddress 1 field records the destination address (the address of the station 26), theaddress 2 field records the BSSID of thebridge 22, theaddress 3 field records the source address (the address of the station 28) and theaddress 4 is not used. Since the address recorded in theaddress 1 field of thedata frame 50 belongs to the basic service set of therepeater 24, therepeater 24 has to receive thedata frame 50 instead of thestation 26, and transmit an acknowledgement frame to thebridge 22. -
FIG. 5B illustrates some important fields of adata frame 52 transmitted to thestation 26 by therepeater 24 according to the present invention. After receiving thedata frame 50 instead of thestation 26, therepeater 24 will transform thedata frame 50 into thedata frame 52 by changing the content of the BSSID field into the identifier of therepeater 24, and then forward thedata frame 52 to thestation 26. The logic value of the first field and the second field is kept the same, the content of theaddress 2 field for recording the transmitter address has changed into the identifier of therepeater 24,address 1 field and theaddress 3 field are also kept the same and theaddress 4 field is still not used. After receiving thedata frame 52, thestation 26 will transmit an acknowledgement frame to therepeater 24 according the address recorded in theaddress 2 field. - Although the
data frame 50 is transmitted from an access point (the bridge 22) to another access point (the repeater 24) of a distribution system, thebridge 22 transmits thedata frame 50 with a format for transmitting to a station, not with a format for transmitting to an access point of a distribution system. - In other words, when the
station 26 transmits a data frame to thebridge 22 through therepeater 24, thebridge 22 can regard the data frame as one transmitted directly from thestation 26, not from therepeater 24. When thebridge 22 transmits a data frame to thestation 26 throughrepeater 24, thebridge 22 can regard that the data frame is transmitted directly to thestation 26, not forwarded by the repeater. - Compared with the prior art, a repeater using the present invention method for transmitting frames will possess the following advantages:
-
- 1. During the forwarding process, the basic service set identifier (the address of the access point) of the data frame is the only one field to be changed by the repeater according to the present invention. However, there are five fields of the data frame to be changed according to the prior art.
- 2. When the bridge is receiving a data frame, the data frame can be regarded as one transmitted directly from the source station, without concerning the forwarding process performed by the repeater.
- 3. When the bridge is transmitting a data frame, the data frame can be regarded as one transmitted directly to the destination station, without concerning the forwarding process performed by the repeater.
- 4. The repeater using the present invention is adaptable for the access point, which conforms to IEEE 802.11.
- The above-described embodiments of the present invention are intended to be illustrative only. Numerous alternative embodiments may be devised by those skilled in the art without departing from the scope of the following claims.
Claims (14)
1. A circuit comprising:
an input adapted to receive a frame transmitted wireless from a station of a wireless local area network wherein the frame comprises a first basic service set identifier in a first field, a first source address in a second field and a first destination address in a third field;
wherein the circuit is configured to replace in the first field of the first frame the first basic service set identifier by a second basic service set identifier of an access point of the wireless local area network while maintaining the first source address and the first destination address; and
an output adapted to transfer the replaced first frame to a wireless transmission entity.
2. The circuit of claim 1 ,
wherein the circuit comprises a further input adapted to receive a second frame transmitted from the access point of the wireless local area network, the second frame comprising the second basic service set identifier in a first field and a second source address in a second field and a second destination address in a third field;
wherein the circuit is configured to replace in the first field of the second frame the second basic service set identifier by the first basic service set identifier while maintaining the second source address and the second destination address; and
a further output adapted to transfer the replaced second frame to the wireless transmission entity.
3. The circuit of claim 1 , wherein the first frame further comprises a fourth field and fifth field, wherein the fourth field is set logic one for indicating that the first frame is transmitted to a distribution system, and the fifth field is set to logic zero for indicating that the second frame is not transmitted from a distribution system.
4. A WLAN system comprising:
a first access point;
a second access point, wherein the second access point is configured to receive from a first station a first frame comprising a basic service set identifier field, a source address field and a destination address field; and
wherein the second access point is configured to replace in the first frame the content of the basic service set identifier field by an identifier of the first access point while maintaining the content of the source address field and the destination address field; and wherein the second access point is configured to transmit the replaced first frame wireless to the first access point.
5. The WLAN system according to claim 4 , wherein the second access point is configured to receive wireless from the first access point a second frame, the second frame comprising a destination address field, a basic set identifier field and a source address field;
wherein the second access point is configured to replace in the second frame the content of the basic service set identifier field by an identifier of the second access point while maintaining the content of the source address field and the destination address field; and
wherein the second access point is configured to transmit the replaced second frame to the first station.
6. The WLAN system according to claim 5 , wherein the second access point conforms to IEEE 802.11.
7. A repeater device comprising:
an input adapted to receive a frame transmitted wireless from a station of a wireless local area network, the frame using three address fields; and
wherein the repeater device is configured to modify the frame and to wireless transfer the modified frame to a bridge, the modified frame using no other address fields than the three address fields.
8. The repeater device of claim 7 , wherein a first one of the three address fields used in the frame records a basic service set identifier, a second one of the three address fields records a source address and a third one of the three address fields records a destination address.
9. The repeater device according to claim 8 , wherein the repeater device is configured to modify the content of the first address field while maintaining the content of the second and third address field.
10. The repeater device according to claim 9 , wherein the frame is a data frame conformable to IEEE 802.11.
11. A WLAN system comprising:
a bridge access point; and
a repeater access point, wherein the repeater access point is configured to receive from a station a frame and to wirelessly transmit the received frame to the bridge access point, wherein the WLAN system is configured to use only three address fields in the frame when transmitting the received frame from the repeater access point to the bridge access point.
12. The WLAN system according to claim 11 , wherein a first one of the three address fields used in the frame records a basic service set identifier, a second one of the three address fields records a source address and a third one of the three address fields records a destination address.
13. The WLAN system according to claim 12 , wherein the repeater access point is configured to modify the content of the first address field while maintaining the content of the second and third address field.
14. The WLAN system according to claim 11 , wherein the frame is a data frame conformable to IEEE 802.11.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/511,572 US20150023340A1 (en) | 2003-04-04 | 2014-10-10 | Method for Transmitting Frames in a Wireless Local Area Network |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW092107843 | 2003-04-04 | ||
TW092107843A TWI241815B (en) | 2003-04-04 | 2003-04-04 | Frame transmission method of WLAN and data structure thereof |
US10/775,882 US7411920B2 (en) | 2003-04-04 | 2004-02-10 | Method for transmitting frames in a wireless local area network |
US12/137,804 US8885619B2 (en) | 2003-04-04 | 2008-06-12 | Method for transmitting frames in a wireless local area network, a circuit including an input and an output, and a WLAN system with a bridge access point and a repeater access point |
US14/511,572 US20150023340A1 (en) | 2003-04-04 | 2014-10-10 | Method for Transmitting Frames in a Wireless Local Area Network |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/137,804 Continuation US8885619B2 (en) | 2003-04-04 | 2008-06-12 | Method for transmitting frames in a wireless local area network, a circuit including an input and an output, and a WLAN system with a bridge access point and a repeater access point |
Publications (1)
Publication Number | Publication Date |
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US20150023340A1 true US20150023340A1 (en) | 2015-01-22 |
Family
ID=33096147
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US10/775,882 Active 2024-08-24 US7411920B2 (en) | 2003-04-04 | 2004-02-10 | Method for transmitting frames in a wireless local area network |
US12/137,804 Expired - Fee Related US8885619B2 (en) | 2003-04-04 | 2008-06-12 | Method for transmitting frames in a wireless local area network, a circuit including an input and an output, and a WLAN system with a bridge access point and a repeater access point |
US14/511,572 Abandoned US20150023340A1 (en) | 2003-04-04 | 2014-10-10 | Method for Transmitting Frames in a Wireless Local Area Network |
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US10/775,882 Active 2024-08-24 US7411920B2 (en) | 2003-04-04 | 2004-02-10 | Method for transmitting frames in a wireless local area network |
US12/137,804 Expired - Fee Related US8885619B2 (en) | 2003-04-04 | 2008-06-12 | Method for transmitting frames in a wireless local area network, a circuit including an input and an output, and a WLAN system with a bridge access point and a repeater access point |
Country Status (2)
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US (3) | US7411920B2 (en) |
TW (1) | TWI241815B (en) |
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KR100644690B1 (en) * | 2005-04-15 | 2006-11-10 | 삼성전자주식회사 | Method and apparatus for transmitting frame efficiently in wireless mesh network |
US20060268715A1 (en) * | 2005-05-06 | 2006-11-30 | Interdigital Technology Corporation | Method and apparatus for transmitting management information in a wireless communication system |
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US20110274029A1 (en) * | 2010-05-10 | 2011-11-10 | Comcast Cable Communications, Llc | Wireless Range Extender |
US20120051346A1 (en) * | 2010-08-24 | 2012-03-01 | Quantenna Communications, Inc. | 3-address mode bridging |
CN105246171B (en) * | 2011-12-23 | 2018-08-21 | 华为技术有限公司 | A kind of trunking method and wireless relay apparatus of wireless relay apparatus |
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Also Published As
Publication number | Publication date |
---|---|
US7411920B2 (en) | 2008-08-12 |
US20080240064A1 (en) | 2008-10-02 |
US20040196819A1 (en) | 2004-10-07 |
TWI241815B (en) | 2005-10-11 |
TW200421804A (en) | 2004-10-16 |
US8885619B2 (en) | 2014-11-11 |
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