CN109819507A - Co-channel full duplex media access control method in a kind of WLAN - Google Patents
Co-channel full duplex media access control method in a kind of WLAN Download PDFInfo
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- CN109819507A CN109819507A CN201910171330.XA CN201910171330A CN109819507A CN 109819507 A CN109819507 A CN 109819507A CN 201910171330 A CN201910171330 A CN 201910171330A CN 109819507 A CN109819507 A CN 109819507A
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Abstract
The invention discloses in a kind of WLAN, the method of the full-duplex media access control of uplink information is received while central station sends information with certain frequency downlink with same frequency, this method comprises: when netinit, central station is established and safeguards the channel attenuation information table between each subscriber station and central station and other subscriber stations, and central station determines that uplink sends the uplink transmission power at subscriber station and distributing user station when being used for transmission；In message transmitting procedure, central station co-channel full duplex uplink and downlink sends and receives data；Central station adds an empty timeslots T after first short interFrameGap SIFS, new subscriber station, which is sent in this empty timeslots to central station, requests, the attenuation for itself receiving central station signal and other subscriber stations are reported to the attenuation of itself interference signal, central station executes network operation process, updates channel attenuation information table.The method realizes central station side co-channel full duplex and receives and sends messages, and improves information exchange efficiency in WLAN, reduces influence when new subscriber station is added to other subscriber station sending and receiving data.
Description
Technical field
The present invention relates in wireless communication field more particularly to a kind of Wireless LAN, support in co-channel full duplex
Information interacting method between center station and multi-user station.
Background technique
Currently, cordless communication network has been commonly applied to military, civilian every field.But traditional wireless local area
In net, co-channel full duplex function is not supported mostly；Current existing co-channel full duplex research achievement, concentrates at physical layer signal
Reason aspect, apart from practical application, there are also larger gaps.
Summary of the invention
The present invention proposes co-channel full duplex media in a kind of WLAN premised on physical layer supports co-channel full duplex
Access control protocol method solves co-channel full duplex uplink and downlink data and sends opportunity selection, the selection of uplink transmission subscriber station, power
Control problem is increased network utilization.
Co-channel full duplex media access control method in WLAN proposed by the present invention, including following work step:
Step A: netinit establishes power information table；
Step B: data interaction is carried out between central station and subscriber station；
Step C: network is added in new subscriber station application.
For the treatment process of step A, comprising the following steps:
Step A1: netinit, central station initiate initializing signal；
Step A2: receiving the subscriber station competitive channel of central station initializing signal, uses maximum power to center after competing successfully
Report of standing itself receives the attenuation of other subscriber station signals, i.e., the signal p that can receive between subscriber station；Central station calculates
The minimum power intensity of this subscriber station signal can be demodulated, i.e. power threshold is r；
Step A3: the signal strength p received between power threshold r and subscriber station is stored in power information table by central station.
For the treatment process of step B, comprising the following steps:
Step B1: central station starts to send preamble and header information in each transmission cycle, new in header information
Increase tri- effective fields of bitmap, upsender and ACK；
Step B2: central station sends downlink data information with maximum power, and each subscriber station (remove by the subscriber station for receiving central station data
It is synchronous to execute step B.3 outside) according to local data cache situation；
Step B3: subscriber station needs to send if any data, then the report time slot allocation determined according to bitmap field, in this user
Tone signal is sent when time slot of standing reaches does not send tone signal then such as without the data for needing to send to central station；
Step B4: central station receives tone signal while sending downlink data, caches each station data transmission resource and accounts for
With demand, the selection for next frame upsender provides information reference；
Step B5: after tone sending time slots, according to step B.1 in upsender field announcement content, this can be with
The subscriber station for sending uplink information to central station starts to send upstream data, including tri- words of preamble, header and data
Section, central station receive the uplink information while sending downlink data；
Step B6: if central station downlink information is sent completely, the also not sent completion of subscriber station uplink information, then in subscriber station
The time that row information is sent completely as this data interaction end point, if the also not sent completion of central station downlink information, is used
Family station uplink information has been sent completely, then is terminated using the time that central station downlink information is sent completely as this data interaction
Point.
For the treatment process of step C, comprising the following steps:
Step C1: new T time slot of the subscriber station after first short interFrameGap SIFS time slot of central station that be added is sent to central station
Request, reports the attenuation for itself receiving central station signal and other subscriber stations to the attenuation of itself interference signal；
Step C2: central station receives the new report information that subscriber station is added, N(0 < N≤5) initialization letter is initiated after a period
Number；
Step C3: the subscriber station competitive channel of central station initializing signal is received, itself is reported to central station and receives central station
The attenuation of signal and the attenuation for itself receiving other subscriber station interference signals；；
Step C4: central station updates power information table.
Detailed description of the invention
Fig. 1 is WLAN schematic diagram；
Fig. 2 is frame structure schematic diagram of eating dishes without rice or wine；
Fig. 3 is that power information indicates to be intended to；
Fig. 4 is that flow diagram is added in the initialization of wireless network local area network, data transmission and new subscriber station.
Specific embodiment
To keep objects and advantages of the present invention clearer, the present invention is made with example with reference to the accompanying drawing further detailed
Explanation.
WLAN schematic diagram centered on Fig. 1 between station and subscriber station, include: when initializing in network central station,
Subscriber station A, subscriber station B, subscriber station C, subscriber station D, central station send downlink information to subscriber station A, and central station receives subscriber station B
The uplink information of transmission, subscriber station E send application to central station and network are added, and central station executes network operation process.
Fig. 2 is to eat dishes without rice or wine frame structure schematic diagram, identifies uplink and downlink data frame in figure, uplink data frames and downlink data frame
Frame structure is the same, comprising: preamble, header, data and FCS field, SIFS are short frame frame period, and T is extra slots.
Fig. 3 is that power information indicates to be intended to, and records each subscriber station and reaches the power threshold r and respectively use that central station can demodulate
The interference signal p that can receive between the station of family.
Fig. 4 is that flow diagram is added in the initialization of wireless network local area network, data transmission and new subscriber station, for Fig. 1's
WLAN schematic diagram between central station and subscriber station illustrates what netinit, data interaction and new subscriber station were added
Process, the process include:
Step 401: network is initially set up, and central station initiates initializing signal, subscriber station A, subscriber station B, subscriber station C and subscriber station
D can receive this signal；
Step 402: subscriber station A seizes channel at first, and central station calculates the minimum power intensity that can demodulate subscriber station a-signal,
That is it is r that subscriber station A, which reaches the power threshold that central station can demodulate,A；
Step 403: subscriber station C second is seized channel, and the minimum power that central station calculating can demodulate subscriber station C signal is strong
Degree, i.e. it is r that subscriber station C, which reaches the power threshold that central station can demodulate,C, subscriber station C reports to central station and itself receives other use
The attenuation of family station signal, i.e. subscriber station C receive the signal p of subscriber station AAC, subscriber station A receives the signal of subscriber station C
pCA；
Step 404: subscriber station B third seizes channel, and the minimum power that central station calculating can demodulate subscriber station B signal is strong
Degree, i.e. it is r that subscriber station B, which reaches the power threshold that central station can demodulate,B, subscriber station B reports to central station and itself receives other use
The attenuation of family station signal, i.e. subscriber station B receive the signal p of subscriber station AAB, subscriber station A receives the signal of subscriber station B
pBA, subscriber station B receives the signal p of subscriber station CCB, subscriber station C receives the signal p of subscriber station BBC；
Step 405: subscriber station D the 4th is seized channel, and the minimum power that central station calculating can demodulate subscriber station D signal is strong
Degree, i.e. it is r that subscriber station D, which reaches the power threshold that central station can demodulate,D, subscriber station D reports to central station and itself receives other use
The attenuation of family station signal, i.e. subscriber station D receive the signal p of subscriber station AAD, the signal of subscriber station A reception subscriber station D
pDA, subscriber station D receives the signal p of subscriber station BBD, subscriber station B receives the signal p of subscriber station DDB, subscriber station D reception
To the signal p of subscriber station CCD, subscriber station C receives the signal p of subscriber station DDC；
Step 406: central station reports the developments according to each subscriber station, establishes channel attenuation information table, centered on station selection receive
Send out the foundation of data user station；
Step 407: the subscriber station for this time receiving central station downlink information is subscriber station A, and central station is according to w=(m-pxy)-(m-rA)
It calculates separately: w1=(m-pAB)-(m-rA), w2=(m-pAC)-(m-rA), w3=(m-pAD)-(m-rA), compare w1、w2And w3, obtain
Out、w2Maximum, and be positive number, so the subscriber station that this uplink sends information selects subscriber station B, the uplink of subscriber station B sends function
Rate is (m-pAB) (if w1、w2And w3It is not all positive number, then illustrate that this period is not suitable for uplink and downlink and receives and sends messages while carrying out,
Severe jamming can be generated, central station only carries out downlink data transmission), central station broadcasts preamble and header information；
Step 408: subscriber station C and subscriber station D has data to be sent to central station in next cycle, determines in bitmap field
When respectively reporting time slot arrival, tone signal is sent to central station；
Step 409: while central station sends downlink data to subscriber station A, receiving the tone that subscriber station C and subscriber station D is sent
Signal；
Step 410: subscriber station B is with power e=(m-pAB) to central station send uplink information；
Step 411: being sent completely to central station to the downlink information of subscriber station A, subscriber station B is sent to the uplink information of central station
After the completion, this period information exchange terminates；
Step 412: judging whether there is new subscriber station application and network is added, if there is entering step 414, if not entering into step
Rapid 413；
Step 413: network cycle executes uplink and downlink information exchange, until there is new subscriber station application to be added, executes new user
Stand addition and network operation process；
Step 414: network is added in subscriber station E application, reports itself to central station fading channel situation, i.e. subscriber station to central station
It is r that E, which reaches the power threshold that central station can demodulate,E, subscriber station E receives the signal p of subscriber station AAE, subscriber station A receives use
The signal p of family station EEA, subscriber station E receives the signal p of subscriber station BBE, subscriber station B receives the signal p of subscriber station EEB,
Subscriber station E receives the signal p of subscriber station CCE, subscriber station C receives the signal p of subscriber station EEC, subscriber station E receives user
Stand the signal p of DDE, subscriber station D receives the signal p of subscriber station EED, central station update power information table；
Step 415: network continues to execute uplink and downlink information exchange；
After the 416:2 period of step, central station initiates initializing signal；
Step 417: each subscriber station seizes channel again in network, executes network establishment process, enters step 413.
In conclusion being not intended to limit the scope of the present invention the above is only preferred embodiments of the invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in guarantor of the invention
Within the scope of shield.
Claims (4)
1. co-channel full duplex media access control method in a kind of WLAN, which is characterized in that including central station and user
It stands, central station is co-channel full duplex operating mode, and subscriber station is half-duplex operating mode；Method content includes that network was established
Journey, data transmit-receive process and new subscriber station are added and network operation process；Wherein,
The central station, for subscriber station access and resource allocation control；
The subscriber station obtains external information by central station and externally sends information for accessing central station；
The co-channel full duplex operating mode refers to that central station under same time, same frequency point, can be received simultaneously and concurrently be served down
Row information；
The half-duplex operating mode refers to subscriber station under same time, same frequency point, and uplink can be transmitted or receive downlink letter
Breath；
The network is established and maintenance process, and wherein network establishment process refers to that central station is actively initiated when network is initially set up
Initializing signal, the response by each subscriber station to initializing signal, establishes power information table；
The data transmit-receive process, refers in transmission cycle, and central station sends and receivees line number up and down with same frequency
According to process and subscriber station send or receive the processes of data；
The new subscriber station is added and network operation process, refers to through frame structure design, after data transmit-receive process, leads to
The mode for seizing time slot is crossed, allows the new subscriber station that is added to central station report power attenuation situation, after central station receives, in N(0 < N
≤ 5) network Establishing process is executed after a period again, updates the process of power information table.
2. network establishment process according to claim 1, which is characterized in that central station collects use by initializing signal
The own signal at family station is decayed and other subscriber stations are to the current interference signal situation reporting subscriber station and generating；Wherein,
Other subscriber stations refer to before this subscriber station of the competition to channel, successfully report channel to central station
The subscriber station of attenuation；
The interference signal that other subscriber stations generate refers to and is transmitted when other subscriber stations report fading channel to central station
Number；
Network establishes specific steps are as follows:
Step 2.1: central station initiates initializing signal；
Step 2.2: receiving the subscriber station competitive channel of central station initializing signal, use maximum power to center after competing successfully
Report of standing itself receives the attenuation of other subscriber station signals, i.e., the signal p that can receive between subscriber station；Central station calculates
The minimum power intensity of this subscriber station signal can be demodulated, i.e. power threshold is r；
Step 2.3: the signal strength p received between power threshold r and subscriber station is stored in power information table by central station.
3. data transmit-receive process according to claim 1, which is characterized in that use for reference message structure in 802.11 agreements and set
Meter, does improvement and design to downstream message and upstream message, and defines upstream message and send request signal tone, using central station
The method for determining that uplink sends the subscriber station of information realizes uplink and downlink data interaction；Wherein,
The downstream message includes preamble, header, message body and detects tail verification FCS, newly-increased in header field
Tri- effective fields of bitmap, upsender and ACK；
The bitmap field, central station formulate bitmap, are used to indicate access not interfere downlink user station to be received as principle
The sending time slots of all subscriber station tone signals of this central station；
The upsender field, for noticing the subscriber station from this period to central station and its uplink that can send uplink information in
Power information；
The ACK field confirms for the uplink information to a upper transmission cycle, including receives and successfully confirm and fail
Retransmit confirmation；
The tone signal, the subscriber station for needing to send upstream data for next period send notice to central station；
The central station determines that uplink sends the subscriber station method of information, and referring to that maximum power can be transmitted in subscriber station uplink is m, respectively
It is r, r that subscriber station, which reaches the power threshold that central station can demodulate,xIt indicates the power threshold of subscriber station x, can receive between subscriber station
The signal arrived is p, pxyWhen indicating that subscriber station x sends uplink information, subscriber station y receives the signal strength of subscriber station x, in network
All subscriber stations utilize formula w=(m-pxy)-(m-rx) power headroom is calculated, it chooses w value maximum and does not influence this downlink reception
The subscriber station of information sends the subscriber station of uplink information as this, and the actual power that subscriber station uplink is sent is e=(m-
pxy)；
Data transmit-receive process specific steps are as follows:
Step 3.1: central station determines that this period uplink sends the subscriber station of information when each transmission cycle starts, and sends
Preamble and header information increases tri- effective fields of bitmap, upsender and ACK in header information newly；
Step 3.2: central station sends downlink data information with maximum power, and each subscriber station (receives the subscriber station of central station data
Except) according to local data cache situation, it is synchronous to execute step 3.3；
Step 3.3: subscriber station needs to send if any data, then the report time slot allocation determined according to bitmap field, in this use
Tone signal is sent when family station time slot reaches does not send tone signal then such as without the data for needing to send to central station；
Step 3.4: central station receives tone signal while sending downlink data, caches each station data and sends resource
Occupancy demand, the selection for next frame upsender provide information reference；
Step 3.5: after tone sending time slots, according to the announcement content of upsender field in step 3.1, this can be with
The subscriber station for sending uplink information to central station starts to send upstream data, including tri- words of preamble, header and data
Section, central station receive the uplink information while sending downlink data；
Step 3.6: if central station downlink information is sent completely, the also not sent completion of subscriber station uplink information, then with subscriber station
The time that uplink information is sent completely as this data interaction end point, if the also not sent completion of central station downlink information,
Subscriber station uplink information has been sent completely, then using the time that central station downlink information is sent completely as this data interaction knot
Beam spot.
4. new subscriber station according to claim 1 is added and network operation process, which is characterized in that be based on 802.11 agreements
Process, first short interFrameGap SIFS time increases extra slots T after data are sent completely, the subscriber station prison being newly added
After listening channel idle to reach the SIFS time, is issued and requested to central station in T time by way of seizing channel, report itself
The attenuation and other subscriber stations for receiving central station signal are to the attenuation of itself interference signal；Central station receives newly
After the report information of subscriber station is added, in N(0 < N≤5) network establishment process is re-executed after a period, update power information
Table.
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