CN105163395B - A kind of wireless local area network access control method based on radio over fibre system - Google Patents
A kind of wireless local area network access control method based on radio over fibre system Download PDFInfo
- Publication number
- CN105163395B CN105163395B CN201510400133.2A CN201510400133A CN105163395B CN 105163395 B CN105163395 B CN 105163395B CN 201510400133 A CN201510400133 A CN 201510400133A CN 105163395 B CN105163395 B CN 105163395B
- Authority
- CN
- China
- Prior art keywords
- poll
- frame
- data
- base station
- field
- 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.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/04—Scheduled or contention-free access
- H04W74/06—Scheduled or contention-free access using polling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
Abstract
The invention discloses a kind of wireless local area network access control method based on radio over fibre system, this method is using IEEE802.11PCF technology as core, for the purpose of improving channel utilization and avoid idle poll, it is active state by the user's mark for having data sending request, the user's mark of data sending request is not dormant state；Base station updates polling list polling table according to User Status in the competition phase after each contention free period, only includes active user in polling list polling table；Furthermore consider that optical fiber introduces time delay and designs re-transmission time in Retransmission timeout mechanism.The beneficial effects of the invention are as follows center base stations to update polling list polling table according to User Status, only polling request is sent to active user, to avoid to idle website poll.
Description
Technical field
The invention belongs to information technology fields, are related to a kind of WLAN access controlling party based on radio over fibre system
Method.
Background technique
Light-carried wireless distributing antenna system (Radio over Fiber-Distributed Antenna Systems,
RoF-DSA in), portable antenna unit (Remote antenna units, RAUs) is connected to by optical fiber based on base station equipment
Centralized control unit.It is same to broadcast in light-carried wireless distributing antenna system (RoF-DAS), the centralized control unit based on single base station
More RAUs are connected, to improve coverage area and bandwidth availability ratio that base station is directed to indoor wireless networks.The system up-link
In, the user terminal in different RAUs coverage areas is needed through competition sharing base and transmission medium.For RoF network MAC
Layer protocol standard still ununified at present, research are concentrated mainly on to traditional wireless communication standard such as Wi-Fi, WiMAX
MAC protocol improves the relevant parameters such as its response time, and to offset the time delay of optical fiber introducing, to make, it is suitable for optical fiber radio systems
System.IEEE802.11 provides 3 kinds of elementary tactics for the media access control of WLAN: basic distributed coordination (DCF,
Distributed Coordination Function), there is request/reply DCF (DCF in RTS/CTS) and point to coordinate
(PCF, Point Coordination Function) control mode.But in WLAN user and base station access point it
Between standard traffic distance be less than 100 meters, in contrast, access point covers bigger communication range, letter in practical RoF-DAS
Number decaying so that traditional distributed Carrier Sense Multiple access/conflict avoidance (CSMA/CA) validity reduces.Based on reservation
The point of mechanism accesses control mode Shen Xi analytic demonstration optical fiber and introduces influence (China of the additional delay to handling capacity
communication,2013(1):81-92)；Li Jian qiang etc. proposes a kind of access control based on IEEE 802.11
Optimisation strategy solves hidden terminal problem using PCF access way, and is increased in the PIFS period according to Optical Fiber Transmission distance
Optical fiber introduces delay time to improve handling capacity (China communication, 2014 (5): 37-48), still, this method
So that waiting-timeout time for consuming when base station poll free time website increases, channel utilization is reduced when low-load.
Summary of the invention
The purpose of the present invention is to provide a kind of the wireless local area network access control method based on radio over fibre system, solution
Existing method increases waiting-timeout time for consuming when base station poll free time website, and channel utilization drops when low-load
Low problem.
The technical scheme adopted by the invention is that following the steps below:
Step 1: defining frame format
Request to send frame RTS, it sends and removes frame CTS, data frame Data, acknowledgement frame ACK；
Request to send frame RTS, when polling list polling table is added to base station requests for active user, including Frame Control,
Src, Dest, Serv_type, FCS field, wherein Frame Control field is control field, 2 bytes, the wherein part Type
b7b6b5b4The part=1011, Subtype b3b22 byte of=01, Src field indicates sender address, 2 byte of Dest field, mark
Bright recipient address, 2 byte of Serv_type field remain for prioritization, no priority area timesharing Serv_type=in advance
0x00；When sending polling beacon to active user for base station, the part Frame Control field Type in CF-Poll
b7b6b5b4The part=0110, Subtype b3b22 byte of=10, Src field indicates sender address, 2 byte of Dest field, mark
Bright recipient address, 2 byte of Poll_squ field request object poll serial number, no priority area timesharing Serv_ for showing
Type=0x00；FCS field is the ITU-T CRC check position of 16bit；
Send remove frame CTS: for base station to user send poll order more new information, including Frame Control,
Src, Dest, Poll_squ, FCS field, wherein Frame Control field is control field, 2 bytes, the wherein part Type
b7b6b5b4The part=1100, Subtype b3b22 byte of=01, Src field indicates sender address, 2 byte of Dest field, mark
Bright recipient address, 2 byte of Poll_squ field are used to indicate the poll serial number for receiving user in epicycle CFP；FCS field is
The ITU-T CRC check position of 16bit；
Data frame Data: authorized user and cognitive user are sent to the data of base station, including Frame Control, Src,
Dest, Dsn, I_last, Data, FCS field, wherein Src, Dest, FCS field definition are identical with RTS, 1 word of Dsn field
Section, indicates current data serial number, 1 byte of I_last field indicate whether current data packet is the last one data in buffer area,
I_last=FF expression is that I_last=0x00 indicates that there are also remaining datas in buffer area；DATA field is data information, length
It is variable；Frame Control field Type part b in Date+CF-ACK7b6b5b4The part=0001, Subtype b3b2=10,
Frame Control field Type b in Date7b6b5b4The part=0000, Subtype b3b2=10；
ACK acknowledgement frame: for confirming data receiver and request of data, including Frame when base station is sent to active user
Control、Src、Dest、Dsn、SNext, FCS field, wherein Src, Dest, FCS field definition are identical with RTS, Dsn field
2 bytes indicate next data frame number that application receives；As the I_last=0x00 received, Dsn=Dsn+1, Frame
Control field Type part b7b6b5b4The part=1101, Subtype b3b2=01；As the I_last=0xFF received,
Reply Frame Control field Type b in CF-Poll+ACK frame in base station7b6b5b4The part=0111, Subtype b3b2=
10, Dsn=0x00；SNEXT2 byte of field is marked as next request object poll serial number, works as SNEXT=0x00 shows polling list polling table
In all STA received base station poll, Frame Control field Type b in CF-End+ACK is replied in base station7b6b5b4
The part=1111, Subtype b3b2=10；Active user is sent to the ACK of base station for confirming that polling list polling table more new information correctly connects
Receive, including Frame Control, Src, Dest, Dsn, Poll_squ, FCS field, wherein Src, Dest, FCS field definition with
It is identical in RTS；Frame Control field Type part b7b6b5b4The part=1101, Subtype b3b2=01, Dsn=
2 byte of 0x00, Poll_squ field, for indicating STA poll serial number；FCS field is the ITU-T CRC check position of 16bit；
Step 2: the polling multi-access Access Control Policy based on User Status
(1) contention free period
Base station sends beacon label CFP and starts, TSIFSBehind interval base station to active user according to polling list polling table sequence to work
Family request data is employed, access procedure is polled, wherein SIFS is referring to IEEE 802.11, TSIFS=28 μ s；
As I_last=FF in the data frame that base station receives, by the way that Dsn=0, S are arranged in the ACK frame of replyNext=
Poll_squ+1 indicates the polling request to active user next in polling list polling table；When the last one in polling list polling table is completed in base station
After user data receives, by the way that Dsn=0x00, S are arranged in the ACK of replyNext=0x00 label CFP terminates；
Active user persistently listens to channel during CFP, when Poll_squ is equal to currently in the RTS frame for receiving base station transmission
User's poll serial number, or receive Dsn=0x00 and S in ACKNextWhen equal to active user's poll serial number, the interval SIFS
Active user sends data to base station afterwards；Data transmission uses Retransmission timeout mechanism, and sender is after sending information frame
TPIFS_delayTime-out does not receive ACK confirmation and then carries out data re-transmission, TPIFS_delayConsider that optical fiber introduces propagation delay time, counts as the following formula
It calculates:
TPIFS_delay=TPIFS+2×fiber length×5μs/km
Wherein, TPIFSReferring to IEEE802.11 value TPIFS=78 μ s；
Active user is completed to enter dormant state stopping channel sense after all data are sent in caching, reaches to new data
After be waken up and listen to channel again；Polling list polling table is added in application during CP after receiving CF-End+ACK frame；
(2) phase is competed
System enters the CP stage after base station sends CF-End+ACK；Active user uses RTS/CTS during CP
The poll qualification of DCF mechanism application acquisition next round；Active user applies for poll serial number to base station by RTS frame；
Base station be properly received after in CTS frame Poll_squ field indicate user's poll serial number；It is true that user replys ACK frame after being properly received
Recognize；Timing is more than T after using Retransmission timeout mechanism, information frame to send during CPDIFS_delayReply is not received then to start to retransmit,
TDIFS_delayConsider that optical fiber introduces delay and calculates according to the following formula:
TDIFS_delay=TDIFS+2×fiber length×5μs/km
Wherein TDIFSReferring to IEEE802.11 value TDIFS=128 μ s.
Further,
1) base station end control algolithm:
Step 1: Initialize installation Poll_squ=0x01；
Step 2: sending Beacon label CFP and start；
Step 2: sending polling request CF-Poll；
Step 3: if TPIFS_delayTime-out does not receive data then return step 2；If being properly received data, ACK confirmation is replied
Frame；As I_last=0xFF in received Data frame, ACK+CF_Poll is replied, wherein Poll_squ=Poll_squ+1,
Dsn=0；As I_last=0x00 in received Data frame, Poll_squ=Poll_squ, Dsn=Dsn+1 in ACK are replied；
Step 4: receiving Poll_squ and be the Data frame of the last one user in polling list polling table, until detecting I_last=
0xFF, sending ACK+CF_End label CFP terminates；
Step 5: listening to channel, receive the RTS from active user, distribute Poll_squ；TDFISTime-out does not receive RTS,
Return step 1；
Step 6: replying CTS and inform user's poll serial number Poll_squ；
Step 7: the ACK frame from Poll_squ user is received,；TDFIS_delayTime-out does not receive ACK and then retransmits, and returns to step
Rapid 6；
Step 8: listening to channel, T after being properly received ACKDFIS_delayTime-out does not receive RTS, return step 1；
2) user terminal control algolithm:
Step 1: data reach, and STA is waken up into active state；
Step 2: listening to channel, interval SIFS sends RTS frame application addition polling list polling table after receiving CF_end frame；
Step 3: receiving the CTS frame from base station, record Poll_squ serial number, reply ACK confirmation；
Step 4: listening to channel, receive CF_Poll the or ACK+CF_Poll signal from base station, start to send data；
Step 5: data transmission terminates, into dormant state；Return step 1.
The beneficial effects of the invention are as follows relative in well known RoF-DAS Access Control Technique, the present invention is based on IEEE
Coordinate access control mode at 802.11 points and a kind of dynamic polling connection control method based on User Status cognition, this method are provided
In there is no data to send accessing user enter dormant state, center base station updates polling list polling table according to User Status, only to activity
User sends polling request, to avoid to idle website poll.
Detailed description of the invention
Fig. 1 is an example communication system, and disclosed one or more implementations can be implemented in the communication system
Mode；
Fig. 2 is can be with four class media access control information frame format used in communication system shown in Fig. 1；
Fig. 3 is can be with Frame Control field format in four category informations frame structure shown in Fig. 2；
Fig. 4 is an example user in the flow chart for implementing disclosed scheme access scheme；
Fig. 5 is an exemplary base in the flow chart for implementing open scheme polling dispatching scheme；
Fig. 6 is in light-carried wireless distributing antenna system shown in Fig. 1 using WLAN of the present invention access control
The embodiment of the method for system.
Specific embodiment
The present invention is described in detail With reference to embodiment.
This method is using IEEE802.11PCF technology as core, for the purpose of improving channel utilization and avoid idle poll,
It is active state by the user's mark for having data sending request, the user's mark of data sending request is not dormant state；Base
It stands and polling list polling table, poll is updated according to User Status after each contention free period (Contention Free Period, CFP)
Active user is only included in table.
The present invention completes according to the following steps:
1. defining frame format
Invention provide media access control method include four class frames: request to send frame (RTS), send remove frame (CTS),
Data frame (Data), acknowledgement frame (ACK).
Frame Control field definition in four class frame structures is identical as IEEE802.11, wherein using Type and
Subtype field indicates packet type.FCS field is the ITU-T CRC check position of 16bit.
Request to send frame RTS: when polling list polling table is added to base station requests for active user, including Frame Control,
Src, Dest, Serv_type, FCS field.Wherein Frame Control field is control field, 2 bytes, wherein Type
b7b6b5b4The part=1011, Subtype b3b2=01；2 byte of Src field, indicates sender address；2 byte of Dest field, mark
Bright recipient address；2 byte of Serv_type field remains for prioritization, no priority area timesharing Serv_type=in advance
0x00；When sending polling beacon to active user for base station, Frame Control field Type in CF-Poll
b7b6b5b4The part=0110, Subtype b3b2=10；2 byte of Src field, indicates sender address；2 byte of Dest field, mark
Bright recipient address；2 byte of Poll_squ field requests object poll serial number, no priority area timesharing Serv_ for showing
Type=0x00；FCS field is the ITU-T CRC check position of 16bit.
Send remove frame CTS: for base station to user send poll order more new information, including Frame Control,
Src, Dest, Poll_squ, FCS field.Wherein Frame Control field is control field, 2 bytes, wherein Type
b7b6b5b4The part=1100, Subtype b3b2=01,；2 byte of Src field, indicates sender address；2 byte of Dest field,
Indicate recipient address；2 byte of Poll_squ field is used to indicate the poll serial number for receiving user in epicycle CFP；FCS field
For the ITU-T CRC check position of 16bit.
Data frame DATA: authorized user and cognitive user are sent to the data of base station, including Frame Control, Src,
Dest, Dsn, I_last, Data, FCS field.Wherein Src, Dest, FCS field definition are identical with RTS, 1 word of Dsn field
Section, indicates current data serial number, 1 byte of I_last field indicate whether current data packet is the last one data in buffer area,
I_last=FF expression is that I_last=0x00 indicates that there are also remaining datas in buffer area；DATA field is data information, length
It is variable；Frame Control field Type b in Date+CF-ACK7b6b5b4The part=0001, Subtype b3b2=10, Date
Middle Frame Control field Type b7b6b5b4The part=0000, Subtype b3b2=10.
ACK acknowledgement frame: for confirming data receiver and request of data, including Frame when base station is sent to active user
Control、Src、Dest、Dsn、SNext, FCS field, wherein Src, Dest, FCS field definition are identical with RTS, Dsn field
2 bytes indicate next data packet serial number that application receives；As the I_last=0x00 received, in Dsn=Dsn+1, ACK
Frame Control field Type b7b6b5b4The part=1101, Subtype b3b2=01；As the I_last=FF received
When, Frame Control field Type b in Dsn=0x00, CF-Poll+ACK7b6b5b4The part=0111, Subtype b3b2
=10；SNEXT2 byte of field is marked as next request object poll serial number, works as SNEXT=0x00 shows own in polling list polling table
STA had received base station poll, at this time Frame Control field Type b in CF-End+ACK7b6b5b4=1111,
The part Subtype b3b2=10；Active user is sent to the ACK of base station for confirming that polling list polling table more new information is properly received, including
Frame Control, Src, Dest, Dsn, Poll_squ, FCS field, wherein Src, Dest, FCS field definition and phase in RTS
Together；Frame Control field Type b7b6b5b4The part=1101, Subtype b3b2=01；Dsn=0x00, Poll_squ
2 byte of field, for indicating STA poll serial number；FCS field is the ITU-T CRC check position of 16bit.
2. the polling multi-access Access Control Policy based on User Status
Based on IEEE 802.11PCF superframe by contention free period (Contention Free Period, CFP) and competition phase
(Contention Period, CP) is constituted.
Base station sends beacon label CFP and starts, TSIFSBehind interval base station to active user according to polling list polling table sequence to work
Family request data is employed, access procedure is polled, wherein SIFS is referring to IEEE 802.11, TSIFS=28 μ s.When base station receives
Data frame in I_last=FF when, by the way that Dsn=0, S are arranged in the ACK frame of replyNext=Poll_squ+1, expression pair
The polling request of next active user in polling list polling table；After the last one user data reception in polling list polling table is completed in base station, lead to
It crosses in the ACK of reply and Dsn=0x00 is set, SNext=0x00 label CFP terminates.
Active user persistently listens to channel during CFP, when Poll_squ is equal to currently in the RTS frame for receiving base station transmission
User's poll serial number, or receive Dsn=0x00 and S in ACKNextWhen equal to active user's poll serial number, the interval SIFS
Active user sends data to base station afterwards；In data transmission procedure, if user T after sending Date framePIFS_delayTime-out is not
It receives ACK acknowledgement frame and then carries out data re-transmission.TPIFS_delayConsider that optical fiber introduces propagation delay time, be calculated as follows:
TPIFS_delay=TPIFS+2×fiber length×5μs/km
Wherein, TPIFSReferring to IEEE802.11 value TPIFS=78 μ s.Fiber length is fiber lengths.
Active user is completed to enter dormant state stopping channel sense after all data are sent in caching, reaches to new data
After be waken up, begin listening for channel, when receive label CFP terminate ACK frame after, during subsequent CP application be added poll
Table.
System enters the CP stage after CFP.Active user is obtained next using RTS/CTS DCF mechanism application during CP
The poll qualification of wheel.Active user applies for poll serial number to base station by RTS frame；Base station be properly received after in CTS frame Poll_
Squ field indicates user's poll serial number；User replys ACK frame acknowledgment after being properly received；Base station starts timing after sending CTS, counts
When be more than TDIFS_delayIt does not receive ACK acknowledgement frame then to start to retransmit, TDIFS_delayConsider that optical fiber introduces delay and calculates according to the following formula:
TDIFS_delay=TDIFS+2×fiber length×5μs/km
Wherein TDIFSReferring to IEEE802.11 value TDIFS=128 μ s.
3. base station AP control algolithm:
Step 1: Initialize installation Poll_squ=0x01；
Step 2: sending Beacon label CFP and start；
Step 3: sending polling request CF-Poll；
Step 4: if TPIFS_delayTime-out does not receive data then return step 2；If being properly received data, ACK confirmation is replied
Frame.As I_last=0xFF in received Data frame, ACK+CF_Poll is replied, wherein Poll_squ=Poll_squ+1,
Dsn=0.As I_last=0x00 in received Data frame, Poll_squ=Poll_squ, Dsn=Dsn+1 in ACK are replied.
Step 5: receiving Poll_squ and be the Data frame of the last one user in polling list polling table, until detecting I_last=
0xFF, sending ACK+CF_End label CFP terminates.
Step 6: listening to channel, receive the RTS from active user, distribute Poll_squ；TDFISTime-out does not receive RTS,
Return step 1；
Step 7: replying CTS and inform user's poll serial number Poll_squ；
Step 8: the ACK frame from Poll_squ user is received,；TDFIS_delayTime-out does not receive ACK and then retransmits, and returns to step
Rapid 6；
Step 9: listening to channel, T after being properly received ACKDFIS_delayTime-out does not receive RTS, return step 1.
4. user's STA control algolithm:
Step 1: data reach, and STA is waken up into active state；
Step 2: listening to channel, interval SIFS sends RTS frame application addition polling list polling table after receiving CF_end frame；
Step 3: receiving the CTS frame from base station, record Poll_squ serial number, reply ACK confirmation；
Step 4: listening to channel, receive CF_Poll the or ACK+CF_Poll signal from base station, start to send data；
Step 5: data transmission terminates, into dormant state；Return step 1.
Fig. 1 is an example communication system, and disclosed one or more implementations can be implemented in the communication system
Mode；Fig. 2 is can be with four class media access control information frame format used in communication system shown in Fig. 1.Fig. 3 is can be
Frame Control field format in four category information frame structures shown in Fig. 2.Fig. 4 is an example user disclosed in the implementation
The flow chart of scheme access scheme.Fig. 5 is an exemplary base in the flow chart for implementing open scheme polling dispatching scheme.Figure
6 be in light-carried wireless distributing antenna system shown in Fig. 1 using the method reality of WLAN of the present invention access control
Apply example.Table 1 is the part Type and Subtype assignment explanation in mac frame Frame Control field of the present invention.
Table 1
Specific embodiment is set forth below, and the present invention will be described.
The present embodiment show a roll-call access period in access control process.Light-carried wireless distribution in embodiment
Formula antenna system has 1 base station BS and 3 wireless access terminal user STA.In the present embodiment CFP start time, STA1 and
For STA2 because there is data sending request to be in active state, base station had been completed the update of polling list polling table within a upper competition phase
Polling list polling table is added in STA1 and STA2.Then media access control flow journey is as follows in current polling cycle:
T0: base station sends Beacon mark contention free period and starts；
T1: interval TSIFSBase station sends the request of CF-Poll data access to STA1 afterwards；
T2:STA1 receives the CF-Poll frame from base station, is spaced TSIFSCF-ACK and Date frame is sent to base station afterwards,
And I_last=0xFF is marked to indicate the data transfer ends in the last one Date frame；
T3: base station receives the Data frame that I_last=0xFF is marked with from STA1, is spaced TSIFSAfter send ACK+CF-
Poll marks Poll-squ=STA2 incidentally to the data request information of STA2；
T4: have data reach wake up dormant user Idel STA, into active state after begin listening for channel；
The data buffer area t5:STA1 is sky, is transferred to dormant state after being properly received the ACK+CF-Poll frame from base station；
T6:STA2 receives the ACK-CF-Poll frame from base station, is spaced TSIFSCF-ACK and Date is sent to base station afterwards
Frame, and mark I_last=0xFF to indicate the data transfer ends in the last one Date frame；
T7: having data to reach and wake up STA 1 in a dormant state, into active state after begin listening for channel；
T8:STA2 marks I_last=0xFF to indicate the data transfer ends in the last one Date frame；
T9: base station receives the Data frame that I_last=0xFF is marked with from STA2, detects in polling list polling table without remaining STA
It needs to access, is spaced TSIFSACK+CF-end frame is sent afterwards, marks SNext=0x00 incidentally indicates that contention free period terminates；
T10: the STA of active state listens to after ACK+CF-end into contention access state, using RTS/CTS Working mould
Formula sends the polling sequence of a polling request application new round to base station；
T11: base station updates polling list polling table, completes the distribution of new round polling sequence, and contention access periods terminate；Send Beacon
Indicate that the next round uncontested data access phase starts.
Advantages of the present invention:
1, in the error retransmission treatment mechanism of access application and data transfer phase, consider that optical fiber introduces transmission delay and sets
Count TDFIS_delayAnd TDFIS_delayIt is more suitable for RoF-DAS system；
2, demand is sent according to user data and carries out User Status differentiation；
3, the user that no data sends demand enters dormant state, and active user participates in competition polling sequence；
4, base station updates polling list polling table according to User Status in competing cycle, avoids the idle access in polling cycle, mentions
High network throughput；
5, the parallel processing that data transmission and request of data is realized using piggy mechanism, when reducing data awaiting transmission
Prolong.
The above is only not to make limit in any form to the present invention to better embodiment of the invention
System, any simple modification that embodiment of above is made according to the technical essence of the invention, equivalent variations and modification,
Belong in the range of technical solution of the present invention.
Claims (2)
1. a kind of wireless local area network access control method based on radio over fibre system, it is characterised in that according to the following steps into
Row:
Step 1: defining frame format
Request to send frame RTS, it sends and removes frame CTS, data frame Data, acknowledgement frame ACK；
Request to send frame RTS, for active user to base station requests be added polling list polling table when, including Frame Control, Src,
Dest, Serv_type, FCS field, wherein Frame Control field is control field, 2 bytes, the wherein part Type
b7b6b5b4The part=1011, Subtype b3b22 byte of=01, Src field indicates sender address, 2 byte of Dest field, mark
Bright recipient address, 2 byte of Serv_type field remain for prioritization, no priority area timesharing Serv_type=in advance
0x00；When sending polling beacon to active user for base station, the part Frame Control field Type in CF-Poll
b7b6b5b4The part=0110, Subtype b3b22 byte of=10, Src field indicates sender address, 2 byte of Dest field, mark
Bright recipient address, 2 byte of Poll_squ field request object poll serial number, no priority area timesharing Serv_ for showing
Type=0x00；FCS field is the ITU-TCRC check bit of 16bit；
Send remove frame CTS: for base station to user send poll order more new information, including Frame Control, Src,
Dest, Poll_squ, FCS field, wherein Frame Control field is control field, 2 bytes, the wherein part Type
b7b6b5b4The part=1100, Subtype b3b22 byte of=01, Src field indicates sender address, 2 byte of Dest field, mark
Bright recipient address, 2 byte of Poll_squ field are used to indicate the poll serial number for receiving user in epicycle CFP；FCS field is
The ITU-TCRC check bit of 16bit；
Data frame Data: authorized user and cognitive user are sent to the data of base station, including Frame Control, Src, Dest,
Dsn, I_last, Data, FCS field, wherein Src, Dest, FCS field definition are identical with RTS, and 1 byte of Dsn field is indicated
Current data serial number, 1 byte of I_last field indicate whether current data packet is the last one data, I_last in buffer area
=FF indicates that current data packet is the last one data in buffer area, and I_last=0x00 indicates that there are also remainders in buffer area
According to；DATA field is data information, and length is variable；Frame Control field Type part b in Date+CF-ACK7b6b5b4
The part=0001, Subtype b3b2Frame Control field Type b in=10, Date7b6b5b4The portion=0000, Subtype
Divide b3b2=10；
ACK acknowledgement frame: for confirming data receiver and request of data, including Frame when base station is sent to active user
Control, Src, Dest, Dsn, SNext, FCS field, wherein Src, Dest, FCS field definition are identical with RTS, Dsn word
2 bytes of section, indicate next data frame number that application receives；As the I_last=0x00 received, Dsn=Dsn+1,
Frame Control field Type part b7b6b5b4The part=1101, Subtype b3b2=01；As the I_last=received
When 0xFF, Frame Control field Type b in CF-Poll+ACK frame is replied in base station7b6b5b4The part=0111, Subtype
b3b2=10, Dsn=0x00；2 byte of SNEXT field is marked as next request object poll serial number, works as SNEXT=0x00 table
All STA had received base station poll in bright polling list polling table, and Frame Control field Type in CF-End+ACK is replied in base station
b7b6b5b4The part=1111, Subtype b3b2=10；Active user is sent to the ACK of base station for confirming that polling list polling table updates letter
Breath is properly received, including Frame Control, Src, Dest, Dsn, Poll_squ, FCS field, wherein Src, Dest, FCS word
Duan Dingyi is identical with RTS；Frame Control field Type part b7b6b5b4The part=1101, Subtype b3b2=01,
2 byte of Dsn=0x00, Poll_squ field, for indicating STA poll serial number；The ITU-TCRC that FCS field is 16bit is verified
Position；
Step 2: the polling multi-access Access Control Policy based on User Status
1) contention free period
Base station sends beacon label CFP and starts, TSIFSBehind interval base station to active user according to polling list polling table sequence to active user
Request data is polled access procedure, and wherein SIFS is referring to IEEE802.11, TSIFS=28 μ s；
As I_last=FF in the data frame that base station receives, by the way that Dsn=0, S are arranged in the ACK frame of replyNext=Poll_
Squ+1 indicates the polling request to active user next in polling list polling table；When the last one number of users in polling list polling table is completed in base station
After reception, by the way that Dsn=0x00, S are arranged in the ACK of replyNext=0x00 label CFP terminates；
Active user persistently listens to channel during CFP, when Poll_squ is equal to active user in the RTS frame for receiving base station transmission
Poll serial number, or receive Dsn=0x00 and S in ACKNextWhen equal to active user's poll serial number, behind the interval SIFS when
Preceding user sends data to base station；Data transmission uses Retransmission timeout mechanism, sender T after sending information framePIFS_delayIt is super
Shi Wei receives ACK confirmation and then carries out data re-transmission, TPIFS_delayConsider that optical fiber introduces propagation delay time, be calculated as follows:
TPIFS_delay=TPIFS+2×fiber length×5μs/km
Wherein, TPIFSReferring to IEEE802.11 value TPIFS=78 μ s；
Active user is completed to enter dormant state stopping channel sense, the quilt after new data arrival after all data are sent in caching
Channel is listened in wake-up again；Polling list polling table is added in application during CP after receiving CF-End+ACK frame；
2) phase is competed
System enters the CP stage after base station sends CF-End+ACK；Active user uses RTS/CTS during CP
The poll qualification of DCF mechanism application acquisition next round；Active user applies for poll serial number to base station by RTS frame；Base station
Poll_squ field indicates user's poll serial number in CTS frame after being properly received；User replys ACK frame acknowledgment after being properly received；
Timing is more than T after using Retransmission timeout mechanism, information frame to send during CPDIFS_delayReply is not received then to start to retransmit,
TDIFS_delayConsider that optical fiber introduces delay and calculates according to the following formula:
TDIFS_delay=TDIFS+2×fiber length×5μs/km
Wherein TDIFSReferring to IEEE802.11 value TDIFS=128 μ s.
2. existing according to a kind of wireless local area network access control method based on radio over fibre system, feature described in claim 1
In:
1) base station end control algolithm:
Step 1: Initialize installation Poll_squ=0x01；
Step 2: sending Beacon label CFP and start；
Step 3: sending polling request CF-Poll；
Step 4: if TPIFS_delayTime-out does not receive data then return step 2；If being properly received data, ACK acknowledgement frame is replied；When
In received Data frame when I_last=0xFF, ACK+CF_Poll is replied, wherein Poll_squ=Poll_squ+1, Dsn=0；
As I_last=0x00 in received Data frame, Poll_squ=Poll_squ, Dsn=Dsn+1 in ACK are replied；
Step 5: it receives Poll_squ and is the Data frame of the last one user in polling list polling table, until detect I_last=0xFF,
Sending ACK+CF_End label CFP terminates；
Step 6: listening to channel, receive the RTS from active user, distribute Poll_squ；TDFISTime-out does not receive RTS, returns to step
Rapid 1；
Step 7: replying CTS and inform user's poll serial number Poll_squ；
Step 8: receiving the ACK frame from Poll_squ user, TDFIS_delayTime-out does not receive ACK and then retransmits, return step 6；
Step 9: listening to channel, T after being properly received ACKDFIS_delayTime-out does not receive RTS, return step 1；
2) user terminal control algolithm:
Step 1: data reach, and STA is waken up into active state；
Step 2: listening to channel, interval SIFS sends RTS frame application addition polling list polling table after receiving CF_end frame；
Step 3: receiving the CTS frame from base station, record Poll_squ serial number, reply ACK confirmation；
Step 4: listening to channel, receive CF_Poll the or ACK+CF_Poll signal from base station, start to send data；
Step 5: data transmission terminates, into dormant state；Return step 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510400133.2A CN105163395B (en) | 2015-07-09 | 2015-07-09 | A kind of wireless local area network access control method based on radio over fibre system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510400133.2A CN105163395B (en) | 2015-07-09 | 2015-07-09 | A kind of wireless local area network access control method based on radio over fibre system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105163395A CN105163395A (en) | 2015-12-16 |
| CN105163395B true CN105163395B (en) | 2019-04-02 |
Family
ID=54804123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510400133.2A Active CN105163395B (en) | 2015-07-09 | 2015-07-09 | A kind of wireless local area network access control method based on radio over fibre system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105163395B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017185259A1 (en) * | 2016-04-27 | 2017-11-02 | 华为技术有限公司 | Method for transmitting information in optical wireless communication network, coordinator and terminal node |
| CN108667486A (en) * | 2018-03-30 | 2018-10-16 | 浙江理工大学 | A kind of reliable polling communication method of power line carrier |
| CN108966279B (en) * | 2018-08-17 | 2020-02-18 | 北京邮电大学 | Radio over fiber access method and system based on central pressure marginalization |
| CN113438743B (en) * | 2021-06-11 | 2022-07-08 | 杨志军 | Self-adaptive multi-server polling access control method and system |
| CN113556825B (en) * | 2021-07-02 | 2023-09-26 | 中国船舶集团有限公司第七二四研究所 | Multi-attribute decision-based polling method in point coordination |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512721A (en) * | 2002-12-26 | 2004-07-14 | �ʼҷ����ֵ��ӹɷ�����˾ | Radio local net work system and method with increased central coordination control |
| GB2440195A (en) * | 2006-07-20 | 2008-01-23 | Toshiba Res Europ Ltd | Optimising superframe periods to reduce delay to delay-sensitive traffic |
| CN104066094A (en) * | 2014-06-19 | 2014-09-24 | 云南大学 | Wireless cognitive network spectrum access method based on two-level roll polling |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7058074B2 (en) * | 2000-11-01 | 2006-06-06 | Texas Instruments Incorporated | Unified channel access for supporting quality of service (QoS) in a local area network |
-
2015
- 2015-07-09 CN CN201510400133.2A patent/CN105163395B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512721A (en) * | 2002-12-26 | 2004-07-14 | �ʼҷ����ֵ��ӹɷ�����˾ | Radio local net work system and method with increased central coordination control |
| GB2440195A (en) * | 2006-07-20 | 2008-01-23 | Toshiba Res Europ Ltd | Optimising superframe periods to reduce delay to delay-sensitive traffic |
| CN104066094A (en) * | 2014-06-19 | 2014-09-24 | 云南大学 | Wireless cognitive network spectrum access method based on two-level roll polling |
Non-Patent Citations (1)
| Title |
|---|
| Ra＇ul Palacios等.An Energy-efficient Point Coordination Function Using Bidirectional Transmissions of Fixed Duration for Infrastructure IEEE 802.11 WLANs.《IEEE ICC 2013 - Communication QoS, Reliability and Modeling Symposium》.2013,第2443-2448页. |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105163395A (en) | 2015-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10243714B2 (en) | Efficient uplink SDMA operation | |
| CN105163395B (en) | A kind of wireless local area network access control method based on radio over fibre system | |
| US7477621B1 (en) | System and method for estimating bandwidth requirements of and allocating bandwidth to communication devices operating in a network | |
| US9226227B2 (en) | Group based beacons | |
| US20060193279A1 (en) | Method and system for accessing a channel in a wireless communications network using multi-polling | |
| CN104160756A (en) | Supporting a large number of devices in wireless communications | |
| US20120135694A1 (en) | Unscheduled protocols for switched antenna arrays | |
| US20050025131A1 (en) | Medium access control in wireless local area network | |
| KR20030025417A (en) | Data communication method based backoff number control | |
| CN108432328A (en) | Wireless communication device and terminal installation | |
| CN105900513A (en) | Method and apparatus for channel competition | |
| US20130235796A1 (en) | System and Method for Uplink Transmission in a Wireless Network | |
| US20060120334A1 (en) | Enhanced direct link transmission method and system for wireless local area networks | |
| CN104066094A (en) | Wireless cognitive network spectrum access method based on two-level roll polling | |
| WO2016167310A1 (en) | Terminal device, communication method, and communication system | |
| CN103188739A (en) | Transmission method of frame in network and transmission device of frame in network | |
| US20220400500A1 (en) | Enabling legacy (non-eht) stations to operate on the conditional link of a soft ap mld | |
| Ullah et al. | INAV: Minimizing delay induced by DCF control packet losses in IEEE 802.11 to optimize throughput | |
| CN116783976A (en) | Channel access on non-simultaneous transmit/receive links | |
| EP2820769B1 (en) | System and method for uplink transmission in a wireless network | |
| Reddy et al. | Solving the hidden terminal problems using directional-antenna based MAC protocol for wireless Adhoc networks | |
| Wang et al. | A reliable MAC layer multicast protocol in Millimetre Wave WPANs | |
| Sheu et al. | An ACK-based polling strategy for supporting high performance and QoS in IEEE 802.11 wireless networks | |
| COMŞA et al. | Simulation Model for WLAN and GSM interoperating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220728 Address after: No. b01-195, Kunming Science and Technology Innovation Park, No. 3, Jingkai Road, economic development zone, Kunming area, China (Yunnan) pilot Free Trade Zone, Kunming, Yunnan 650216 Patentee after: Yunnan youbei Communication Technology Co.,Ltd. Address before: 650091 Yunnan province Kunming City Lake Road No. 2 Patentee before: YUNNAN University |
|
| TR01 | Transfer of patent right |