CN104639289B - The orientation connection control method that idle node aids in a kind of WLAN - Google Patents
The orientation connection control method that idle node aids in a kind of WLAN Download PDFInfo
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Abstract
The invention provides the orientation connection control method that idle node in a kind of WLAN aids in, content includes：Source node first listens to channel, after channel idle, sends orientation request and sends DRTS information；After idle neighbor node receives DRTS, judge whether the DRTS interferes the communication other nodes according to information list, if interfering, idle neighbor node sends neighbor information bag NIP, blockage source node-node transmission to source node；If do not interfere, then according to oriented network allocation vector DNAV values in the DRTS fresh information lists, the wave beam that destination node is received on source node DRTS directions sends orientation to source node to be allowed to send DCTS information, source node starts to send data and transmission success is confirmed after the response of destination node is received, and returns to listening state.Hidden node problem caused by present invention, avoiding being listened due to handshake leakage, is added the logarithm of parallel transmission node, improves channel utilization.
Description
Technical field
The invention belongs to media access control MAC technical field in WLAN WLAN, it is related to and is aided in by idle node
To suppress the connection control method for the interference that switched beam antenna is brought, idle node aids in specifically a kind of WLAN orientation
Connection control method.
Background technology
With WLAN WLAN continuous development, the interference problem getting worse between WLAN interior joints.In order to reduce
Switched beam antenna is introduced wlan system by the interference between node, industry, makes full use of switched beam antenna to be answered to improve space
With rate, network performance is lifted.Switched beam antenna uses orientation works pattern in data communication process, and request can be brought to send out
Send/allow the leakage for sending RTS/CTS handshake to listen, so as to produce new concealed nodes, cause dry with frequency in WLAN
Disturb problem.
Patent No. CN200410047437.7 Chinese invention patent " is mitigated dry in wireless network using directional aerial
The influence disturbed " sends and receives control data using omnidirectional antenna, and the control data helps locating wireless device and determined wireless
When routine data is sent to antenna assembly or receives routine data from antenna assembly by device.Antenna assembly utilizes orientation
Routine data is sent to wireless device and receives routine data from wireless device by antenna.Because directional aerial uses guided wave
Beam, directional aerial can be according to the position adjustments of relative antenna device wireless device to disturbing few channel.What the patent used determines
It can be reduced together according to the position adjustments of relative antenna device wireless device to few channel is disturbed so as to reach to antenna equipment
The purpose of frequency interference, but need equipment to switch channel, certain time delay and packet loss phenomenon can be caused.
Patent No. CN201110218077.2 Chinese invention patent " is hidden eventually in WLAN infrastructure mode
Hold the processing method of phenomenon " space that wireless access point AP covers is divided into multiple wave beams using switched beam antenna, make wireless
Access point covers the user in multiple wave beams successively.The a certain moment only has the user in a wave beam to ask to send data,
And the user in other wave beams is in blocked state at this moment, it is impossible to which request sends data so that each moment participates in competing
The number of users striven is reduced, and alleviates the concealed terminal phenomenon in WLAN.The patent uses switched beam antenna processing nothing
Concealed terminal phenomenon in line LAN.This method reduce concealed terminal, but in same network, possible some users communication compared with
More, some users communication is less, and multiple users are covered successively and waste channel resource, and fairness is poor.
The content of the invention
The shortcomings that it is an object of the invention to overcome above-mentioned prior art, there is provided what idle node aided in a kind of WLAN determines
To connection control method, when the orientation request that idle neighbor node receives source node transmission sends DRTS information, idle neighbours
Node judges whether new transmission request forms to current network and disturbed, if sending section according to the information list of self maintained
Point interferes to the node transmitted, then sends neighbor information bag NIP to the sending node to block new transmission, to subtract
Concealed nodes phenomenon in few WLAN, so as to reduce the interference between node, improve systematic function.
The technical scheme is that：The orientation connection control method that idle node aids in a kind of WLAN, including it is as follows
Step：
Step 1：When source node there are data to need to send, channel is first listened to, checks whether channel is idle.First check letter
Mode of operation corresponding to destination node whether has been cached in breath list.If there is caching, Working mould corresponding to destination node is checked
Whether oriented network allocation vector DNAV values are 0 under formula；If without caching, the DNAV values checked under source node default mode of operation
Whether it is 0.DNAV represents the channel idle under the mode of operation for 0；DNAV does not represent that the mode of operation lower channel takes for 0,
Need to wait until DNAV values are decremented to 0.Wherein, source node refers to the node for having data needs to send, and destination node refers to connect
Receive the node of source node data；
The field included in described information list is：Neighbors address, mode of operation, DNAV, signal intensity RSSI and
Information effective time；An information list is cached in each node, and according to the DRTS received, continuous fresh information row
Table；
Wherein, neighbors address is used for the mac address information for recording adjacent node；
Mode of operation is used to preserve mode of operation selection when this node communicates with neighbors, that is, the beam switchover day used
The beam direction of line.Default mode of operation is the most wide wave beam in omni-beam or all wave beams, or from all wave beams
In a randomly selected wave beam；
DNAV is used to record the channel duration that neighbors is preengage on certain beam direction, and Working mould is corresponded in the duration internal congestion
Formula；
RSSI is used for the signal intensity for recording the neighbor node that local node receives；
Information effective time is used to judge whether the information that currently preserves is expired, and this data item letter is deleted if expired
Breath, to ensure the real-time of current information and validity；
Step 2：After source node listens to channel idle, DRTS is sent to destination node；
Step 3：After receiving DRTS signals, idle neighbor node judges whether source node is right according to the information list of itself
Present communications interfere；If being judged as there is interference, idle neighbor node sends neighbor information bag NIP, obstruction to source node
It sends；If be judged as it is noiseless, without any processing；Wherein idle neighbor node refers in source node coverage
, the node in idle condition；
Step 4：When the transmission request that source node is initiated interferes to present communications, source node receives NIP, then temporarily resistance
Plug transmission, and the value of the DNAV on sending direction is updated, step 1 is then back to, the value for waiting DNAV is initiated to send again after being 0
Request；
Step 5：When the transmission request that source node is initiated does not interfere with to present communications, source node, which receives destination node and used, to be determined
Allow to the orientation that wave beam is sent after sending DCTS information, source node adjusts antenna mode to the Working mould of alignment destination node
Formula, i.e. optimal mode；
Step 6：Source node sends packet and the orientation response DACK information for waiting destination node to be sent with directional beam
Arrival；
Step 7：Source node receives DACK, then this time sends successfully, return to step 1.
Whether the idle neighbor node described in above-mentioned steps 3 judges source node to current logical according to the information list of itself
The specific deterministic process that letter interferes is as follows：
(1) idle neighbor node obtains source node address, destination node address, duration, signal intensity by DRTS signals
Information, and the position of source node is estimated by the angle information that reaches of DRTS signals, and obtain the wave beam of this corresponding direction source node
Switch the label of antenna direction mode of operation；
(2) the neighbors address in information list is searched, determines that the address of source node whether there is,
If not finding source node, before explanation from the information or the information of source node for not hearing source node
Failure is deleted, then adds new data item in information list for source node；
If finding source node, its information is updated, the mode of operation in information list is updated to obtain
The orientation works pattern label obtained, and its corresponding information effective time is updated to current time；
(3) idle neighbor node is checked all with source node mode of operation identical node DNAV values, if in the presence of not being 0
Value, then to source node send NIP；If all 0, the DNAV values checked under the opposite beam direction of source node；Wherein, it is described
The opposite beam direction of source node is using opposite direction of the source node as starting point, idle neighbor node for the beam direction of terminal；
(4) the DNAV values under the opposite beam direction of source node are not 0, then by RSSI corresponding to source node and opposite wave beam side
RSSI is added corresponding to the downward node to communicate, if the value being added is more than threshold value, NIP is sent to source node；
If being less than threshold value, illustrate source node beyond just in the coverage of communication node, then in the absence of co-channel interference；Wherein
The node to communicate under opposite beam direction is the node that DNAV values are not 0；
(5) the DNAV values under the opposite beam direction of source node are all 0, or the RSSI value after being added is less than threshold value, then
Check destination node information whether is cached with information list；
(6) if being cached with destination node information in the information list of idle neighbor node, all and purpose section is checked
Whether the DNAV values of point mode of operation identical node are 0, if in the presence of the value for not being 0, NIP is sent to source node；If not yet
There is caching destination node information or be all 0 with the DNAV values of destination node mode of operation identical node, then need to only update source
DNAV values under node respective antenna pattern.
Idle neighbor node in above-mentioned steps 3 judges whether source node is made to present communications according to the information list of itself
It is S0+S1 into the threshold value described in (4) step in the specific deterministic process of interference.Wherein, signal of the signal in transmitting terminal
Intensity is S0, and the interference signal intensity that receiving terminal receives is S1, and under this interference signal the current communication of receiving terminal not by
Interrupt.
Beneficial effects of the present invention：The present invention main thought be：Idle node monitors network condition, utilizes self maintained
Information list judge current transmission condition；When the node for terminating transmission interferes in new transmission direction to existing transmission
In the case of send NIP, block its transmission on interference radiating way.Advantages of the present invention is as follows：
(1) switched beam antenna is introduced in a wireless local area network, and compared with omnidirectional antenna, the introducing of switched beam antenna carries
Parallel transmission node logarithm in system has been risen, and as wave beam number increases the increase of parallel transmission node logarithm.
(2) hidden node problem brought for switched beam antenna, the present invention is using the side for introducing idle node auxiliary
Method.Idle neighbor node perceives current transmission situation, according to information list, concealed nodes is judged and send NIP obstructions
Its transmission on interference radiating way, avoid the hidden node problem caused by handshake leakage is listened.
(3) in the present invention, idle node is not to send NIP to the node of all ends of transmission of surrounding, but is first carried out
Judge, if source node interferes to the node transmitted, idle neighbor node just sends NIP to source node, avoids
The phenomenon that substantial amounts of NIP collides.
(4) in the present invention, it is same to determine whether new communication node produces to former communication node using RSSI value
Frequency disturbs, and such a process increases the logarithm of parallel transmission node, improves channel utilization.
The present invention is described in further details below with reference to accompanying drawing.
Brief description of the drawings
Fig. 1 is concrete implementation process flow diagram flow chart of the present invention；
Fig. 2 is the deterministic process flow chart of idle neighbor node；
Fig. 3 is the network structure topological diagram in the present invention.
Embodiment
Traditional DMAC agreements realize that surrounding saves by the way of request to send/allowed to send RTS/CTS signal reserve channels
Point carries out DNAV settings when hearing handshake, the wave beam blocked on the direction that can be interfered, realizes that distributed beams switch
Control.But listen shaking hands for channel booking using that may be leaked in the wlan system of switched beam antenna, during directive sending/reception
Signal, cause hidden node problem.As shown in figure 3, node A, D and C, B are communicated, node A wave beam is locked in wave beam 3 and entered
Row directional data is received and dispatched, therefore the DRTS/DCTS handshake between B, C is listened in leakage.After A and the D ends of transmission, if mesh new node A
Node be B, C or F, then the data transfer that the DRTS in the direction of wave beam 4 can be between interfering nodes B, C；And A carries out repetitive requests
Until B returns to omni-directional mode and response after terminating the transmission with C.Hidden node problem can have a strong impact on systematic function, and this
Problem generally existing in the wlan system based on switched beam antenna.In order to solve the wlan system based on switched beam antenna
In new hidden node problem, be one the invention provides the orientation connection control method that idle node in a kind of WLAN aids in
The orientation connection control method of kind idle node auxiliary, its main thought are：Idle node monitors network condition, is tieed up using itself
The information list of shield judges current transmission condition；When the node for terminating transmission causes to do in new transmission direction to existing transmission
NIP is sent in the case of disturbing, blocks its transmission on interference radiating way.
Three class nodes are included in the implementation process of the present invention：Source node, destination node, idle neighbor node.Source node
Refer to the node for there are data needs to send, destination node refers to the node for receiving source node data, and idle neighbor node refers to
In source node coverage, the node in idle condition.
Refering to Fig. 1, concrete implementation step is as follows：
Step 1：After node A, D terminate transmission, when source node A has data to need to be sent to destination node F, source is saved first
Point A wants monitor channel, checks whether channel is idle, i.e., first checks work corresponding to destination node F whether has been cached in information list
Operation mode, if there is caching, check whether oriented network allocation vector DNAV values are 0 under mode of operation corresponding to destination node F,
If without caching, whether the DNAV values checked under source node default mode of operation are 0.DNAV is represented under the mode of operation for 0
Channel idle；DNAV does not represent that the mode of operation lower channel is taken, it is necessary to wait until DNAV values are decremented to 0 for 0.
In the present invention, following field is included in information list：Neighbors address, mode of operation, DNAV, signal intensity
RSSI, information effective time.By taking node E as an example, the nodal information list of its maintenance is provided, referring to table 1.
The idle node E of table 1 information list
Neighbors address：For recording the mac address information of adjacent node, " AddrA " represents node A MAC Address, "
AddrB " represents node B MAC Address, by that analogy.
Mode of operation：For preserving mode of operation selection when this node communicates with neighbors, that is, the beam switchover used
The beam direction of antenna.Mode of operation number is relevant with antenna beam number, if node has the different wave beam of M kinds, M is just whole
Count, then mode of operation can be expressed as 0~M-1, and 0 represents default mode.
DNAV：For recording the channel duration that neighbors is preengage on certain beam direction, represented with 0, T1, T2 ....T1,T2…
It is not 0, represents to correspond to mode of operation in the duration internal congestion.DNAV was 0 expression beam direction upper signal channel free time.
RSSI：The signal intensity of the neighbor node received for recording local node, unit dBm, with 0, P1, P2,
P3 ... represents that P1, P2, P3 ... are not 0.Estimate two nodes whether beyond coverage using the RSSI of reception signal.
Information effective time：Whether the information for judging currently to preserve is expired, with 0, Tlive1, Tlive2,
Tlive3 ... represents that Tlive1, Tlive2, Tlive3 ... are not 0, represents not out of date.If the field is 0, represents expired, then delete
Except this data item information, to ensure the real-time of current information and validity.
Node E analyzes the information in this information list, judge current network transmit situation, make data frame send, receive,
Auxiliary avoids the decision-makings such as co-channel interference.
Step 2：Source node A listens the handshake between B, C due to leakage, therefore is not blocked on the direction of interfering beam 4,
Source node A sends DRTS to destination node F.
Step 3：After idle neighbor node E receives DRTS signals in the direction of wave beam 2, source node is judged according to information list
Whether present communications are interfered.If being judged as there is interference, idle neighbor node sends NIP to source node A, blocks its hair
Send；If being judged as noiseless, NIP need not be sent.Refering to Fig. 2, specific deterministic process is as follows：
(1) idle neighbor node E passes through DRTS signals acquisition source node A address, destination node F address, duration, letter
Number strength information.And source node A position is estimated by the angle information that reaches of DRTS signals, and obtain this corresponding direction source node
The label of A switched beam antenna orientation works pattern.
(2) " the neighbors address " in information list is searched, determines that source node A address whether there is.
Have no resolution if a, searched, failed before explanation from the information or source node A information for not hearing source node A
It is deleted, then adds new data item in information list for source node A.
If b, finding source node A, its information is updated." mode of operation " in information list is updated to
Acquired orientation works pattern label.And " information effective time " corresponding to it is updated to current time.
(3) idle neighbor node E checks all and source node A " mode of operation " identical node DNAV values.
If a, send NIP to source node A in the presence of the value for not being 0.
If b, all 0, the DNAV values checked under the opposite beam directions of source node A.
(4) the DNAV values under the opposite beam directions of source node A are not 0, then by RSSI corresponding to source node A and opposite wave beam
The node to communicate i.e. DNAV values under direction are not added for RSSI corresponding to 0 node, if being more than threshold value, judge that source is saved
Point A is node B, C concealed nodes.To avoid concealed nodes from disturbing, idle neighbor node E sends to source node A and includes node
B, the NIP of C addresses and DNAV values, source node A receive after this packet DNAV values corresponding to B, C in fresh information list and stopped
Only data transfer；If being less than threshold value, illustrate source node A beyond node B, C coverage, therefore in the absence of dry with frequency
Disturb.It after adding RSSI judgements, can more accurately judge whether source node influences current transmission, and then suppress concealed nodes interference
Generation.Threshold value described in specific deterministic process is S0+S1.Wherein, signal is S0 in the signal intensity of transmitting terminal, is received
It is S1 to terminate the interference signal intensity received, and the current communication of receiving terminal is not disrupted under this interference signal.In a wlan,
S0 values are 20dBm, and S1 values are between -75dBm~10dBm.
(5) if the DNAV values under the opposite beam directions of source node A are all 0, or RSSI value after being added is less than threshold value,
Then idle neighbor node E checks in information list the information for whether being cached with destination node F.
(6) if being cached with destination node F information in idle neighbor node E information list, all and mesh is checked
The DNAV values of node F " mode of operation " identical node whether be 0.
If a, send NIP to source node A in the presence of the value for not being 0.
If b, do not cache destination node F information or with destination node F " mode of operation " identical node
DNAV values are all 0, then need to only update the DNAV values under source node A respective antenna patterns.
Step 4：When the transmission request that source node A is initiated interferes to present communications, source node A receives NIP, then temporarily
Blocks transmission, and the value of the DNAV on sending direction is updated, step 1 is then back to, the value for waiting DNAV initiates hair again after being 0
Send request；
Step 5：When the transmission request that source node A is initiated does not interfere with to present communications, source node A receives destination node F
After the DCTS of transmission, source node A adjusts antenna mode to alignment destination node F mode of operation；
Step 6：The arrival for orienting response DACK information that source node A sends packet and waits destination node F to send；
Step 7：Source node A receives DACK, then this time sends successfully, return to step 1.
To sum up, the hidden node problem brought for switched beam antenna, the present invention is using introduction idle node auxiliary
Method.Idle neighbor node is judged concealed nodes and sends NIP to block it on interference radiating way according to information list
Transmission, avoid the hidden node problem caused by handshake leakage is listened.Simultaneously in the present invention, further sentenced using RSSI value
Whether disconnected source node interferes to present communication node, and such a process increases parallel transmission node logarithm in system, improves
Channel utilization.
There is no the known conventional means of the part category industry described in detail in present embodiment, do not chat one by one here
State.It is exemplified as above be only to the present invention for example, do not form the limitation to protection scope of the present invention, it is every with this
Same or analogous design is invented to belong within protection scope of the present invention.
Claims (3)
1. the orientation connection control method that idle node aids in a kind of WLAN, it is characterised in that comprise the following steps：
Step 1：When source node there are data to need to send, channel is first listened to, checks whether channel is idle；First check that information arranges
Mode of operation corresponding to destination node whether has been cached in table, if there is caching, has been checked under mode of operation corresponding to destination node
Whether oriented network allocation vector DNAV values are 0；If without caching, whether the DNAV values checked under source node default mode of operation
For 0, DNAV be 0 expression the mode of operation under channel idle, DNAV for 0 represent the mode of operation lower channel take, it is necessary to
Wait until DNAV values are decremented to 0；Wherein, source node refers to the node for having data needs to send, and destination node refers to reception source
The node of node data；
The field included in described information list is：Neighbors address, mode of operation, DNAV, signal intensity RSSI and information
Effective time；An information list is cached in each node, and DRTS information is sent according to the orientation request received, constantly
Fresh information list；
Wherein, neighbors address is used for the mac address information for recording adjacent node；
Mode of operation is used to preserve mode of operation selection when this node communicates with neighbors, that is, the switched beam antenna used
Beam direction；Default mode of operation is the most wide wave beam in omni-beam or all wave beams, or from all wave beams with
One wave beam of machine selection；
DNAV is used to record the channel duration that neighbors is preengage on certain beam direction, and mode of operation is corresponded in the duration internal congestion；
RSSI is used for the signal intensity for recording the neighbor node that local node receives；
Information effective time is used to judge that whether the information that currently preserves is expired, deletes this data item information if expired, with
Ensure the real-time and validity of current information；
Step 2：After source node listens to channel idle, DRTS is sent to destination node；
Step 3：After receiving DRTS signals, whether idle neighbor node judges source node to current according to the information list of itself
Communication interferes；If being judged as there is interference, idle neighbor node sends neighbor information bag NIP to source node, blocks its hair
Send；If be judged as it is noiseless, without any processing；Wherein idle neighbor node refers in source node coverage, locates
In the node of idle condition；
Step 4：When the transmission request that source node is initiated interferes to present communications, source node receives NIP, then temporary block passes
It is defeated, and the value of the DNAV on sending direction is updated, step 1 is then back to, the value for waiting DNAV is initiated to send to ask again after being 0
Ask；
Step 5：When the transmission request that source node is initiated does not interfere with to present communications, source node receives destination node guided wave
The orientation that beam is sent allows after sending DCTS information, and source node adjusts antenna mode to the mode of operation of alignment destination node,
That is optimal mode；
Step 6：Source node sends packet and waits arriving for the orientation response DACK information that destination node sent with directional beam
Come；
Step 7：Source node receives DACK, then this time sends successfully, return to step 1.
2. the orientation connection control method that idle node aids in a kind of WLAN as claimed in claim 1, it is characterised in that step
Idle neighbor node described in rapid 3 according to the information list of itself judge source node whether the tool that present communications are interfered
Body deterministic process is as follows：
(1) idle neighbor node obtains source node address, destination node address, duration, signal strength information by DRTS signals,
And the position of source node is estimated by the angle information that reaches of DRTS signals, and obtain the beam switchover day of this corresponding direction source node
The label of line orientation works pattern；
(2) the neighbors address in information list is searched, determines that the address of source node whether there is,
If not finding source node, from not hearing the information of source node or the information of source node has failed before explanation
It is deleted, then adds new data item in information list for source node；
If finding source node, its information is updated, the mode of operation in information list is updated to acquired
Orientation works pattern label, and its corresponding information effective time is updated to current time；
(3) idle neighbor node is checked all with source node mode of operation identical node DNAV values, if in the presence of not being 0
Value, then send NIP to source node；If all 0, the DNAV values checked under the opposite beam direction of source node；Wherein, the source
The opposite beam direction of node is using opposite direction of the source node as starting point, idle neighbor node for the beam direction of terminal；
(4) the DNAV values under the opposite beam direction of source node be 0, then by RSSI corresponding to source node with opposite beam direction
The node to communicate corresponding to RSSI be added, if the value being added is more than threshold value, to source node transmission NIP；It is if small
In threshold value, then illustrate source node beyond just in the coverage of communication node, then in the absence of co-channel interference；It is wherein opposite
The node to communicate under beam direction is the node that DNAV values are not 0；
(5) the DNAV values under the opposite beam direction of source node are all 0, or the RSSI value after being added is less than threshold value, then checks
Whether destination node information is cached with information list；
(6) if being cached with destination node information in the information list of idle neighbor node, all and destination node work is checked
Whether the DNAV values of operation mode identical node are 0, if in the presence of the value for not being 0, NIP is sent to source node；If do not delay
Deposit destination node information or be all 0 with the DNAV values of destination node mode of operation identical node, then need to only update source node
DNAV values under respective antenna pattern.
3. the orientation connection control method that idle node aids in a kind of WLAN as claimed in claim 2, it is characterised in that step
Idle neighbor node described in rapid 3 according to the information list of itself judge source node whether the tool that present communications are interfered
The threshold value described in (4) step in body deterministic process is S0+S1, wherein, signal is S0 in the signal intensity of transmitting terminal, is connect
The interference signal intensity that receiving end receives is S1, and the current communication of receiving terminal is not disrupted under this interference signal.
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| US10602545B2 (en) * | 2016-07-26 | 2020-03-24 | Qualcomm Incorporated | Cooperative hidden node identification and management |
| CN109923797B (en) * | 2016-10-27 | 2022-06-07 | 索尼公司 | Communication device and method with beamforming training |
| CN109906563B (en) | 2016-10-27 | 2022-05-13 | 索尼公司 | Communication device and method with beamforming training |
| US11497056B2 (en) * | 2017-10-19 | 2022-11-08 | Idac Holdings, Inc. | Channel access procedures for directional systems in unlicensed bands |
| EP3771269A4 (en) * | 2018-03-30 | 2021-11-24 | Beijing Xiaomi Mobile Software Co., Ltd. | Method and device for selecting beam |
| CN113839720B (en) * | 2021-09-06 | 2022-11-08 | 中山大学 | Multiple access method of directional underwater acoustic network |
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| CN101119590A (en) * | 2007-08-17 | 2008-02-06 | 北京航空航天大学 | Multi-channel multi-address access method |
| CN101197826A (en) * | 2007-11-30 | 2008-06-11 | 华南理工大学 | Method for solving problems of multi-jumping wireless self-network grouping concealed terminal and exposed terminal |
| CN103037531A (en) * | 2011-10-09 | 2013-04-10 | 中兴通讯股份有限公司 | Wireless station access channel method and wireless station access channel system |
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