CN1925481B - Wireless local area network device and method for numbering frame sequence - Google Patents
Wireless local area network device and method for numbering frame sequence Download PDFInfo
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- CN1925481B CN1925481B CN2005100370226A CN200510037022A CN1925481B CN 1925481 B CN1925481 B CN 1925481B CN 2005100370226 A CN2005100370226 A CN 2005100370226A CN 200510037022 A CN200510037022 A CN 200510037022A CN 1925481 B CN1925481 B CN 1925481B
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Abstract
This invention relates to frame number codes method to process data unit coding in wireless local network, which comprises the following steps: receiving data unit and its work station address and transmission speed; dividing data from different receive work station address and different transmission speed data units. This invention provides one wireless local device by use of invention method to send data with relative receive device to compute different transmission speed wireless local internet frame error rate.
Description
[technical field]
The present invention relates to WLAN (wireless local area network), relate in particular to a kind of Wireless LAN device and method for numbering frame sequence thereof.
[background technology]
The standard-802.11 of IEEE (IEEE) has defined the main framework of media access control (Media Access Control is designated hereinafter simply as MAC) frame format, and it comprises three kinds of Frame, management frames and control frames.As shown in Figures 1 and 2, be respectively MAC Frame 100 and MAC management frames 200.Respectively comprise a sequence control domain 160,260 in Frame 100 and the management frames 200.Sequence control domain 160,260 comprises two subdomains respectively: fragment number (SegmentNumber) territory 161,261 and sequence number (Sequence Number is designated hereinafter simply as SN) territory 162,262.Wherein, sequence number is the MAC service data unit (MAC ServiceData Unit is designated hereinafter simply as MSDU) that carries of frame or the sequence number of Medium Access Control (MAC) Management Protocol Data Unit (MACManagement Protocol Data Unit is designated hereinafter simply as MMPDU).Each MSDU or MMPDU have a sequence number, its numerical value since 0 to 4095.
In conventional method, though conveyer to the data cell MSDU or the MMPDU of its transmission, its sequence number all is to add up always, starts anew after being added to 4095 again.But in general, conveyer is all different to the speed of three kinds of different frames transmission of IEEE 802.11, and management frames and control frame utilize basic rate to transmit usually, and Frame then transmits with the highest supported transfer rate usually.
In addition, whether general conveyer can respond the basis that affirmative acknowledgement signal (Acknowledgement signal, ACK signal) is used as its frame error ratio with receiving system, some device and with this foundation that whether slows down as its transmission rate.But under following situation, can not obtain its frame error ratio by receiving terminal.
First kind of situation is: broadcast frame or some management frames do not need receiving system to respond the ACK signal, so conveyer can not be known the arrival receiving system that the frame that transmitted is whether successful.
Second kind of situation is: the collision problem of No-ACK (no-acknowledgement), one supports the frame that device transmitted of no-ACK not need receiving system to respond ACK.
Whether conveyer can not respond the ACK signal according to receiving system and calculate its frame error ratio in these cases, even in same environment, other receiving system also can't utilize sequence number to calculate its frame error ratio.
[summary of the invention]
The Wireless LAN device that provides in the embodiment of the present invention comprises a media access control layer protocol module, is used for the employed data cell of WLAN (wireless local area network) is compiled sequence number.Media access control layer protocol module comprises a list block and sequence number numbering module.List block is used for providing according to the receiving workstation address of data cell the transmission rate of data cell.Sequence number numbering module is used for the data cell of different receiving workstations address and different transmission rates is compiled sequence number.Described sequence number numbering module comprises counting module storehouse, the first selection module and the second selection module.The counting module storehouse comprises a plurality of counting modules.First selects module to be used to receive described data cell and receiving workstation address thereof, and from described counting module storehouse, select at least one counting module according to the receiving workstation address of described data cell, be respectively applied for the data cell of different transmission rates is compiled sequence number.Second selects module to be used for selecting a counting module according to the present transmission rate of described data cell from the selected counting module of the described first selection module, is used for described data cell is compiled sequence number.
The method for numbering frame sequence that provides in the embodiment of the present invention may further comprise the steps: receiving data units and receiving workstation address and transmission rate; And the data cell of different receiving workstations address and different transmission rates is separately compiled sequence number, the step that described data cell with different receiving workstations address and different transmission rates is separately compiled sequence number may further comprise the steps: according at least one counting module of receiving workstation address choice of described data cell, be used for the data cell of different transmission rates is compiled sequence number; And from above-mentioned counting module, select a counting module according to the present transmission rate of described data cell, be used for described data cell is compiled sequence number.
Wireless LAN device of the present invention is separately compiled sequence number with the data cell of different receiving workstations address and different transmission rates, and the sequence number of being compiled is applied to the sequence number territory of frame that data cell forms, so corresponding receiving system can calculate the number of correct frame by the frame check territory of checking different transmission rates time institute received frame, the sequence number territory of the frame that is received when analyzing different transmission rates can calculate the frame sum that is received again, thus the frame error ratio can obtain different transmission rates the time.
[description of drawings]
Fig. 1 is the MAC data frame format of IEEE 802.11 definition.
Fig. 2 is the MAC management frame format of IEEE 802.11 definition.
Fig. 3 is the Organization Chart of wireless communication system in the embodiment of the invention.
Fig. 4 is the module map of the execution mode of Wireless LAN device of the present invention.
Fig. 5 is the flow chart of Wireless LAN device deal with data of the present invention.
Fig. 6 is the flow chart of the method for numbering frame sequence of mac-layer protocol module of the present invention.
Fig. 7 is the module map of another execution mode of Wireless LAN device of the present invention.
[embodiment]
OSI (Open System Interconnect Reference Model is designated hereinafter simply as osi model) is divided into 7 layers with the network communication protocol system.The bottom of system is physical layer (Physical Layer is designated hereinafter simply as PHY), and it defines media, transmission method and wire laying mode.The second layer of system is data link layer (Data Link Layer), and how its definition guarantees that data correctly transmit, and adds relevant domain of information and forms frame to data.Data link layer comprises two sublayers, be respectively: logical connection control (Logical Link Control, be designated hereinafter simply as LLC) layer, be responsible for data correct send to physical layer, and media access control (Media AccessControl, be designated hereinafter simply as MAC) layer, be responsible for control and the physical media that links physical layer.The 3rd layer of system is network layer (Network Layer), and it is responsible for data route (Routing), comprises the reference address, seeks optimal path and management flow.The 4th layer of system is transport layer (TransportLayer), and it guarantees data arrival order and correctness.The layer 5 of system is Session Layer (SessionLayer), and its definition links dialogue, fault processing and logical address name translation.The layer 6 of system is presentation layer (Presentation Layer), and its deal with data form comprises format conversion, encrypt and decrypt, compression and reduction.The layer 7 of system is application layer (Application Layer), and its definition supply also has directory service and file accessing with the interface and the function of program access.
IEEE 802.11 standard definitions the protocol specification of physical layer and MAC layer, allow WLAN (wireless local area network) and radio equipment manufacturer within the specific limits, set up mutual operational network equipment.The MAC layer of IEEE 802.11 must with LLC layer compatibility, be beneficial to mutual operation.
Fig. 1 is IEEE 802.11 defined MAC data frame formats.MAC Frame 100 comprises: frame control domain 110, the duration/indications territory 120,1 territory 130, address, 2 territories 140, address, 3 territories 150, address, sequence control domain 160,4 territories 170, address, frame territory 180 and frame check territory 190.Wherein sequence control domain 160 comprises two subdomains: fragment number (Segment Number) territory 161 and sequence number territory (Sequence Number, SN) 162.Fig. 2 is IEEE 802.11 defined MAC management frame format.MAC management frames 200 comprises: frame control domain 210, the duration/indications territory 220,1 territory 230, address, 2 territories 240, address, 3 territories 250, address, sequence control domain 260, frame territory 280 and frame check territory 290.Wherein sequence control domain 260 comprises two subdomains: fragment number territory 261 and sequence number territory 262.
As shown in Figures 1 and 2, wherein 1 territory 130,230, address is receiving workstation address (ReceiverAddress, RA) territory, MAC service data unit promptly to be transmitted (MAC Service Data Unit, MSDU) or Medium Access Control (MAC) Management Protocol Data Unit (MAC Management Protocol Data Unit, receiving workstation address MMPDU).The receiving workstation address is made of 48 positions, the corresponding different receiving workstations in different receiving workstations address, and address " FF:FF:FF:FF:FF:FF " then is broadcast address.Sequence control domain 160,260 comprises two subdomains: fragment number territory 161,261 and sequence number territory 162,262.Wherein sequence number is the MSDU that carries of frame or the sequence number of MMPDU.Each MSDU or MMPDU have a sequence number, the scope of its numerical value from 0 to 4095.
Fig. 3 is the Organization Chart of wireless communication system in the embodiment of the invention.In the present embodiment, wireless communication system comprises a plurality of Wireless LAN devices 1000,2000 and 3000.In the present embodiment, Wireless LAN device 1000 transmits data and gives a plurality of Wireless LAN devices 2000,3000, and can transmit broadcast data.
Fig. 4 is the module map of the execution mode of Wireless LAN device 1000 of the present invention.In the present embodiment, Wireless LAN device 1000 comprises: a upper layer protocol module 1100, a mac-layer protocol module 1200 and a physical layer protocol module 1300.Upper layer protocol module 1100 is used for carrying out the function of protocol layers such as OSI application layer, presentation layer, Session Layer, transport layer, network layer and LLC layer, be converted to MSDU transmitting data, and this MSDU and receiving workstation address thereof are sent to mac-layer protocol module 1200.
Mac-layer protocol module 1200 comprises: a data-interface 1210, a sequence number numbering module 1220, a MAC processing module 1230 and a list block 1240.List block 1240 comprises receiving workstation address (RA) and transmission rate (TX Rate) tabulation, is used for providing according to the receiving workstation address of data cell the transmission rate of data cell.Data-interface 1210 is used for receiving MSDU and receiving workstation address thereof from upper layer protocol module 1100, and sends it to sequence number numbering module 1220.MAC processing module 1230 is used for producing a MMPDU and receiving workstation address thereof according to regulatory requirement, and sends it to sequence number numbering module 1220.MAC processing module 1230 also provides present transmission rate to number module 1220 to sequence number according to list block 1240.
Sequence number numbering module 1220 is used for the data cell of different receiving workstations address and different transmission rates is separately compiled sequence number.In the present embodiment, sequence number numbering module 1240 receives MSDU and receiving workstation address thereof from data-interface 1210, receive MMPDU and receiving workstation address thereof from MAC processing module 1230, and, also be used for the MSDU and the MMPDU that are received are compiled sequence number from the present transmission rate of MAC processing module 1230 receptions.
Sequence number numbering module 1220 comprises: one first selects module 1221, one second to select module 1222, a counting module storehouse 1223, a judge module 1224 and a setting module 1225.Counting module storehouse 1223 provides a plurality of counting modules, for example: the first counting module 1223a, the second counting module 1223b... N counting module 1223n.First selects module 1221 to be used for receiving data units and workstation address thereof, and selects at least one counting module according to the receiving workstation address of data cell from counting module storehouse 1223, is respectively applied for the data cell of different transmission rates is compiled sequence number.In the present embodiment, first selects module 1221 to receive MSDU and receiving workstation address thereof from data-interface 1210, and from MAC processing module 1230 reception MMPDU and receiving workstation addresses thereof, at least one counting module is selected in receiving workstation address according to the data cell that is received from counting module storehouse 1223, and selected counting module is informed that second selects module 1222.Second selects module 1222 to be used for selecting counting modules according to the transmission rate of data cell from the first selection module, 1221 selected counting modules, is used for sequence number is compiled in the data unit.In the present embodiment, the second present transmission rate of selecting module 1222 to be provided according to MAC processing module 1230 is selected to select a counting module the module 1221 selected counting modules from first, is used for the data cell that is received is compiled sequence number.Judge module 1224 is used to judge whether second sequence number of selecting module 1222 selected counting modules to compile presets boundary value less than one.If then setting module 1225 is made as the sequence number that above-mentioned counting module is compiled to the sequence number of the data cell that is received; If not, then setting module 1225 is made as default sequence number to the sequence number of the data cell that is received.Setting module 1225 also is used to upgrade counting module storehouse 1223.
Physical layer protocol module 1300 is used for adding another relevant domain of information to mac-layer protocol module 1200 formed MPDU and forms a physical layer protocol data unit (PHY Protocol dataUnit PPDU), and sends out PPDU.
Fig. 5 is the flow chart of Wireless LAN device 1000 deal with data of the present invention.In the present embodiment, give a plurality of Wireless LAN devices 2000,3000, and when transmitting broadcast data, the data that transmitted send out after need passing through the processing of OSI seven layer protocols again when Wireless LAN device 1000 transmits data.
At step S500,1100 pairs of data that transmitted of upper layer protocol module are handled, carry out the function of protocol layers such as application layer, presentation layer, Session Layer, transport layer, network layer and LLC layer among the OSI, the data that transmitted are converted to MSDU, and MSDU and receiving workstation address thereof are sent to mac-layer protocol module 1200.
At step S502, mac-layer protocol module 1200 receives MSDU and receiving workstation address thereof from upper layer protocol module 1100, and produces MMPDU and receiving workstation address thereof according to regulatory requirement.Mac-layer protocol module 1200 is added relevant domain of information such as frame control for MSDU that is received and the MMPDU that is produced and forms MPDU, and formed MPDU is sent to physical layer protocol module 1300.Its concrete operations flow process is seen Fig. 6.
At step S504, physical layer protocol module 1300 receives MPDU from mac-layer protocol module 1200, and MPDU adds another relevant domain of information and forms PPDU, PPDU sent again.
Fig. 6 is the flow chart of the method for numbering frame sequence of mac-layer protocol module of the present invention.
At step S600, data-interface 1210 receives MSDU and receiving workstation address (RA) thereof from upper layer protocol module 1100, and sends it first selection module 1221 of sequence number numbering module 1220 to.MAC processing module 1230 produces MMPDU and receiving workstation address (RA) thereof according to regulatory requirement, and sends it first selection module 1221 of sequence number numbering module 1220 to.The MMPDU that is produced helps online before online, or online back is as the notice of broken string.
At step S602, first selects module 1221 receiving data units MSDU and receiving workstation address thereof, and behind data cell MMPDU and the receiving workstation address thereof, at least one counting module is selected in receiving workstation address according to the data cell that is received from counting module storehouse 1223, be respectively applied for the data cell of different transmission rates is compiled sequence number, it should be noted that the quantity of counting module is that the kind according to transmission rate determines.In the present embodiment, it is to send Wireless LAN device 2000 to that the receiving workstation address of the data cell that is received indicates this data cell, Wireless LAN device 1000,2000 is all supported four kinds of transmission rates such as 11Mbps, 5.5Mbps, 2Mbps, 1Mbps, therefore, need to select four counting modules.In other embodiments, if Wireless LAN device 1000,2000 can be supported more transmission rates, the number of then corresponding selection counting module.If it is to send other Wireless LAN device to that the data cell that is received indicates this data cell, then corresponding other counting module of selection.
At step S604, MAC processing module 1230 provides present transmission rate to select module 1222 to second according to list block.Second selects module 1222 to select to select the module 1222 selected counting modules counting module according to the present transmission rate that is provided from first.In the present embodiment, the second selection module 1222 is the first counting module 1223a according to the selected counting module of present transmission rate that is provided.
At step S606, the first counting module 1223a compiles sequence number (SN) according to a function to the received data unit.In the present embodiment, this function is F (x)=4x+1, wherein x is defined as the order that sends the data cell of Wireless LAN device 2000 with present transmission rate to, be numbered 5 so send the sequence number of first data cell of Wireless LAN device 2000 to present transmission rate, second numbering then is 9, by that analogy.In other embodiments, above-mentioned function can be other linear function or other type of functions.
At step S608, judge module 1224 judges that whether sequence number (SN) that the first counting module 1223a compiled is less than default boundary value.In the present embodiment, this default boundary value is 4096.
If less than default boundary value, at step S610, the sequence number of setting module 1225 setting data unit is the sequence number (SN) that the first counting module 1223a is compiled.In the present embodiment, the sequence number of data cell is made as the sequence number that the first counting module 1223a is compiled.
If be not less than default boundary value, execution in step S612 then, the sequence number of setting module 1225 setting data unit is a predetermined sequence number.In the present embodiment, this predetermined sequence number is 0.
At step S614, setting module 150 upgrades the counting module in the counting module storehouse 1223 according to the setting result of step S610 or S612.In the present embodiment, 1225 couples first counting module 1223a of setting module upgrade.Setting module 1225 sends data cell and receiving workstation address thereof to MAC processing module 1230 with the sequence number of being compiled.
At step S616, MAC processing module 1230 receiving data units and receiving workstation address thereof and the sequence number of being compiled, and the data cell that is received added relevant domain of information such as frame control and form MPDU, and 1225 pairs of set sequence numbers in data unit of setting module are applied to the sequence number territory of formed MPDU, then MPDU is sent to physical layer protocol module 1300.
Fig. 7 is the module map of another execution mode of Wireless LAN device of the present invention.In the present embodiment, in mac-layer protocol module 1200, be that with the difference of the foregoing description MAC processing module 1230 sees through data-interface 1210 earlier and receives MSDU and receiving workstation address thereof from upper layer protocol module 1100, and produce MMPDU and receiving workstation address thereof according to regulatory requirement.MAC processing layer 1230 adds MSDU that is received and the MMPDU that is produced relevant domain of information and forms MPDU, and sends sequence number numbering module 1220 to.In the present embodiment, institute adds relevant domain of information and comprises the sequence number territory, so the sequence number territory of 1220 couples of formed MPDU of sequence number numbering module is upgraded.
In other embodiments, MAC processing module 1230 add relevant domain of information and do not comprise the sequence number territory, then number 1220 couples of formed MPDU of module and compile the sequence number territory.Then, sequence number numbering numbering module 1220 sends formed MPDU to physical layer protocol module 1300.Other constituent components of present embodiment is identical with the constituent components function of a last execution mode, therefore repeats no more.
Wireless LAN device of the present invention is separately compiled sequence number with the data cell of different receiving workstations address and different transmission rates, and be applied to the sequence number territory of formed MPDU, corresponding receiving system can calculate correct MPDU number in the frame check territory (FCS) of the MPDU that receives when checking different transmission rates, the sequence number territory of the MPDU that is received during again by the analysis different transmission rates can calculate the MPDU sum that is received, thereby the error rate of the MPDU in the time of can obtaining different transmission rates (Frame Error Rate, FER), be frame error ratio, its computing formula is:
The FER=mistake MPDU number/MPDU sum that receives;
That is, the MPDU sum of FER=(the MPDU sum that is received-correct MPDU number)/received.
Therefore can determine the relation of transmission rate (TX Rate) and frame error ratio (FER).Receiving system is given conveyer with the relation repayment of transmission rate and FER, thereby can be used as the reference factor that conveyer is adjusted transmission rate.In the present embodiment, the function of the sequence number numbering module 1220 used first counting module 1223a is F (x)=4x+1, thereby if sequence number is no more than 4095, the MPDU sum that is received can calculate by following mathematical formulae:
The MPDU sum that is received=(SN of first MPDU of SN-of last MPDU)/4+1;
If sequence number surpasses 4095, be the number that section divides section to obtain the MPDU that is received then, and then gather with 0-4095, can obtain the sum of the MPDU that is received.Thereby, the FER in the time of can calculating different transmission rates.
Claims (12)
1. a method for numbering frame sequence is used for the employed data cell of WLAN (wireless local area network) is compiled sequence number, it is characterized in that described method for numbering frame sequence comprises:
Receiving data units and receiving workstation address and transmission rate; And
The data cell of different receiving workstations address and different transmission rates is separately compiled sequence number, comprising:
According at least one counting module of receiving workstation address choice of described data cell, be used for the data cell of different transmission rates is compiled sequence number; And
From above-mentioned counting module, select a counting module according to the transmission rate that described data cell is present, be used for described data cell is compiled sequence number.
2. method for numbering frame sequence as claimed in claim 1 is characterized in that: described data cell comprises media access control management protocol data unit and media access control service data unit.
3. method for numbering frame sequence as claimed in claim 1 is characterized in that: the step that described data cell with different receiving workstations address and different transmission rates is separately compiled sequence number is further comprising the steps of:
Whether the sequence number that the counting module that judgement is selected according to the transmission rate of described data cell is compiled is less than a default boundary value; And
If less than described default boundary value, then the sequence number of described data cell is made as the sequence number that the counting module selected according to the transmission rate of described data cell is compiled.
4. method for numbering frame sequence as claimed in claim 3, it is characterized in that: it more may further comprise the steps: if the sequence number that the counting module of selecting according to the transmission rate of described data cell is compiled is not less than described default boundary value, then the sequence number of described data cell is made as default sequence number.
5. method for numbering frame sequence as claimed in claim 1, it is characterized in that: it more may further comprise the steps: the sequence number of being compiled is applied to described data cell.
6. method for numbering frame sequence as claimed in claim 1 is characterized in that: according to the quantity of at least one counting module of the receiving workstation address choice of described data cell is that kind according to transmission rate determines.
7. a Wireless LAN device comprises media access control layer protocol module, is used for the employed data cell of WLAN (wireless local area network) is compiled sequence number, it is characterized in that described media access control layer protocol module comprises:
List block is used for providing according to the receiving workstation address of described data cell the transmission rate of described data cell; And
Sequence number numbering module is used for the data cell of different receiving workstations address and different transmission rates is separately compiled sequence number, and described sequence number numbering module comprises:
The counting module storehouse comprises a plurality of counting modules;
First selects module, be used to receive described data cell and receiving workstation address thereof, and from described counting module storehouse, select at least one counting module according to the receiving workstation address of described data cell, be respectively applied for the data cell of different transmission rates is compiled sequence number; And
Second selects module, is used for selecting a counting module according to the present transmission rate of described data cell from the selected counting module of the described first selection module, is used for described data cell is compiled sequence number.
8. Wireless LAN device as claimed in claim 7 is characterized in that: described data cell comprises media access control management protocol data unit and media access control service data unit.
9. Wireless LAN device as claimed in claim 7 is characterized in that: described sequence number numbering module more comprises judge module, is used to judge that whether sequence number that described second counting module of selecting module to select compiles is less than a default boundary value.
10. Wireless LAN device as claimed in claim 9 is characterized in that: described sequence number numbering module more comprises setting module, and the judged result that is used for according to described judge module is that described data cell is set sequence number.
11. Wireless LAN device as claimed in claim 10 is characterized in that: described sequence number numbering module more comprises media access control processing module, is used for the sequence number that described setting module sets is applied to described data cell.
12. Wireless LAN device as claimed in claim 7 is characterized in that: described first to select the quantity of at least one counting module that module selects be that kind according to transmission rate determines.
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| WO2001078489A3 (en) * | 2000-04-07 | 2002-05-23 | Broadcom Homenetworking Inc | Frame-based communication with variable rate payload |
| CN1612621A (en) * | 2003-10-29 | 2005-05-04 | 中兴通讯股份有限公司 | Base station internal real-time service data transmitting method |
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| WO2001078489A3 (en) * | 2000-04-07 | 2002-05-23 | Broadcom Homenetworking Inc | Frame-based communication with variable rate payload |
| CN1612621A (en) * | 2003-10-29 | 2005-05-04 | 中兴通讯股份有限公司 | Base station internal real-time service data transmitting method |
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