CN104639289A - Auxiliary directional access control method of spare nodes in WLAN - Google Patents
Auxiliary directional access control method of spare nodes in WLAN Download PDFInfo
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Abstract
The invention provides an auxiliary directional access control method of idle nodes in WLAN. The method comprises the following steps: firstly monitoring a channel by a source node, after the channel is idle, sending a Directional Request To Send (DRTS) information; after an idle neighbor node receives the DRTS, judging whether the DRTS causes interference on communication among other nodes according to an information list, if interference is caused, sending a Neighbor Information Package (NIP) to the source node by the idle neighbor node, and blocking the transmission of the source node; if interference is not caused, updating a Directional Network Allocation Vector (DNAV) value in the DRTS information list according to the DRTS, sending Directional Clear To Send (DCTS) information to the source node by a destination node by using a wave beam in the DRTS direction of a receiving source node, beginning to send data by the source node and confirming successful transmission after the response of the destination node is received, and returning to a monitoring state. The problem of hidden nodes caused by handshaking signal listening missing is avoided, the pair number of parallel transmission nodes is increased, and the channel utilization rate is improved.
Description
Technical field
The invention belongs to media access control MAC technical field in WLAN (wireless local area network) WLAN, relate to the connection control method of being assisted the interference suppressing switched beam antenna to bring by idle node, the directed connection control method that specifically in a kind of WLAN, idle node is auxiliary.
Background technology
Along with the development of WLAN (wireless local area network) WLAN, the interference problem between WLAN interior joint is day by day serious.In order to reduce internodal interference, switched beam antenna is introduced wlan system by industry, makes full use of switched beam antenna to improve spatial multiplex ratio, promotes network performance.Switched beam antenna uses orientation works pattern in data communication process, the leakage of request to send/allowed to send RTS/CTS handshake can be brought to listen, thus produce new concealed nodes, cause problem of co-channel interference in WLAN (wireless local area network).
When the patent No. is that the Chinese invention patent of CN200410047437.7 " utilizes directional antenna to alleviate the impact of the interference in wireless network " to utilize omnidirectional antenna to send and receives control data, and this control data helps locating wireless device and determines that routine data is sent to antenna assembly or from antenna assembly reception program data by wireless device.Antenna assembly utilizes directional antenna routine data to be sent to wireless device and from wireless device reception program data.Because directional antenna uses directional beam, directional antenna can according to the position adjustments of relative antenna device wireless device to disturbing few channel.The Directional antenna devices that this patent uses according to the position adjustments of relative antenna device wireless device to disturbing few channel, thus can reach the object reducing co-channel interference, but needs equipment switching channels, can cause certain time delay and packet loss phenomenon.
The patent No. is that the Chinese invention patent " processing method of hidden station phenomenon in wireless local area network infrastructure mode " of CN201110218077.2 uses switched beam antenna that the space that wireless access point AP covers is divided into multiple wave beam, makes WAP (wireless access point) cover user in multiple wave beam successively.The a certain moment only has the user in a wave beam can ask to send data, and the user in other wave beams is in blocked state in this moment, can not ask to send data, the number of users that each moment is participated in the competition reduces, and alleviates the concealed terminal phenomenon in WLAN (wireless local area network).This patent uses concealed terminal phenomenon in switched beam antenna process WLAN (wireless local area network).This method reduce concealed terminal, but in same network, more possible telex networks are more, and some telex networks are less, cover successively and waste channel resource, and fairness is poor to multiple user.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, the directed connection control method that in a kind of WLAN, idle node is auxiliary is provided, when the orientation request that idle neighbor node receives source node transmission sends DRTS information, idle neighbor node is according to the information list of self maintained, judge whether new transmission request forms interference to current network, if sending node causes interference to the node transmitted, then send neighbor information bag NIP to this sending node and block new transmission, to reduce the concealed nodes phenomenon in WLAN (wireless local area network), thus reduce internodal interference, improve systematic function.
Technical scheme of the present invention is: the directed connection control method that in a kind of WLAN, idle node is auxiliary, comprises the steps:
Step 1: when source node has data to need to send, first monitor channel, checks that whether channel is idle.First to check in information list the mode of operation that whether buffer memory destination node is corresponding.If there is buffer memory, then check whether oriented network allocation vector DNAV value is 0 under the mode of operation that destination node is corresponding; If without buffer memory, then check whether the DNAV value under source node default mode of operation is 0.DNAV is the channel idle under this mode of operation of 0 expression; DNAV is not that this mode of operation lower channel of 0 expression takies, and needs to wait for until DNAV value is decremented to 0.Wherein, source node refers to that data need the node sent, and destination node refers to the node receiving source node data;
The field comprised in described information list is: neighbors address, mode of operation, DNAV, signal strength signal intensity RSSI and information effective time; At each node buffer memory information list, and according to the DRTS received, continuous lastest imformation list;
Wherein, neighbors address is for recording the mac address information of adjacent node;
Mode of operation is selected for the mode of operation of preserving when this node communicates with neighbors, the beam direction of the switched beam antenna namely used.Default mode of operation is the widest wave beam in omni-beam or all wave beams, or from all wave beams a wave beam of Stochastic choice;
DNAV for recording the channel duration of the reservation of neighbors on certain beam direction, in the corresponding mode of operation of this duration internal congestion;
RSSI is used for the signal strength signal intensity of the neighbor node that minute book ground node receives;
Whether information is expired for judging the information of current preservation for effective time, if expired, deletes this data item information, to ensure real-time and the validity of current information;
Step 2: after source node listens to channel idle, sends DRTS to destination node;
Step 3: after receiving DRTS signal, according to the information list of self, idle neighbor node judges whether source node causes interference to present communications; If be judged as interference, then idle neighbor node has sent neighbor information bag NIP to source node, blocks it and sends; If be judged as noiseless, then without the need to any process; Wherein idle neighbor node refers in source node coverage, is in the node of idle condition;
Step 4: when the transmission request that source node is initiated causes interference to present communications, source node receives NIP, then temporary block transmission, and upgrade the value of the DNAV on sending direction, then returns step 1, waits for that the value of DNAV is again send request after 0;
Step 5: when the transmission request that source node is initiated is not disturbed present communications, source node receives after orientation that destination node directional beam sends allows to send DCTS information, antenna mode is adjusted to the mode of operation of aiming at destination node by source node, i.e. optimal mode;
Step 6: source node sends packet and waits for the arrival of the orientation response DACK information that destination node directional beam is sent;
Step 7: source node receives DACK, then this time send successfully, return step 1.
According to the information list of self, idle neighbor node described in above-mentioned steps 3 judges whether source node causes the concrete deterministic process of interference as follows to present communications:
(1) idle neighbor node is by DRTS signal acquisition source node address, destination node address, duration, signal strength information, and estimated the position of source node by the angle of arrival information of DRTS signal, and obtain the label of the switched beam antenna orientation works pattern of this direction source node corresponding;
(2) search the neighbors address in information list, determine whether the address of source node exists,
If do not find source node, lost efficacy deleted from the information of the information or source node that do not hear source node before explanation, then in information table, added new data item for source node;
If find source node, then its information is upgraded, the mode of operation in information list is updated to acquired orientation works pattern label, and the information of its correspondence is updated to current time effective time;
(3) idle neighbor node checks the DNAV value of all nodes identical with source node mode of operation, is not the value of 0, then sends NIP to source node if exist; If be all 0, then check the DNAV value under the contrary beam direction of source node;
(4) the DNAV value under the contrary beam direction of source node is not 0, be then added by the RSSI that RSSI corresponding for source node is corresponding with the node communicated under contrary beam direction, if the value be added is greater than threshold value, then sends NIP to source node; If be less than threshold value, then illustrate that source node is beyond the coverage just at communication node, then do not exist co-channel interference; The node communicated wherein under contrary beam direction is the node that DNAV value is not 0;
(5) the DNAV value under the contrary beam direction of source node is 0 entirely, or the RSSI value after being added is less than threshold value, then check in information list whether be cached with destination node information;
(6) if be cached with destination node information in the information list of idle neighbor node, then check whether the DNAV value of all nodes identical with destination node mode of operation is 0, be not the value of 0 if exist, then send NIP to source node; If do not have the DNAV value of buffer memory destination node information or the node identical with destination node mode of operation to be 0 entirely, then only need upgrade the DNAV value under source node respective antenna pattern.
According to the information list of self, idle neighbor node in above-mentioned steps 3 judges that the threshold value described in whether source node causes in the concrete deterministic process of interference (4) step to present communications is S0+S1.Wherein, signal is S0 in the signal strength signal intensity of transmitting terminal, and the interference signal intensity that receiving terminal receives is S1, and the communication that receiving terminal is current under this interference signal is not interrupted.
Beneficial effect of the present invention: main thought of the present invention is: idle node monitors network condition, utilizes the information list of self maintained to judge current transmission condition; When the node terminating transmission causes when interference existing transmission and sends NIP in new transmission direction, block its transmission on interference radiating way.Advantage of the present invention is as follows:
(1) introduce switched beam antenna in a wireless local area network, compared with omnidirectional antenna, the introducing of switched beam antenna improves parallel transmission node logarithm in system, and increases along with wave beam number increases parallel transmission node logarithm.
(2) for the hidden node problem that switched beam antenna brings, the present invention adopts and introduces the auxiliary method of idle node.Idle neighbor node perception current transmission situation, according to information list, judges concealed nodes and sends NIP to block its transmission on interference radiating way, avoid leaking due to handshake listening the hidden node problem caused.
(3) in the present invention, idle node is not that the node of all ends of transmission towards periphery sends NIP, but first judges, if source node causes interference to the node transmitted, idle neighbor node just sends NIP to source node, avoids the phenomenon that a large amount of NIP collides.
(4), in the present invention, whether new communication node produces co-channel interference to former communication node, such a process increases the logarithm of parallel transmission node, improves channel utilization to utilize RSSI value to judge further.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is the concrete implementation procedure flow chart of the present invention;
Fig. 2 is the deterministic process flow chart of idle neighbor node;
Fig. 3 is the network configuration topological diagram in the present invention.
Embodiment
Tradition DMAC agreement adopts the mode of request to send/allowed to send RTS/CTS signal reserve channel to realize, and carry out DNAV setting when surroundings nodes hears handshake, obstruction can cause the wave beam on the direction of interference, realizes distributed beams switching controls.But adopt in the wlan system of switched beam antenna, the handshake of listening for channel booking may be leaked during directive sending/reception, cause hidden node problem.As shown in Figure 3, node A, D communicate with C, B, and the wave beam of node A is locked in wave beam 3 and carries out directional data transmitting-receiving, therefore leak the DRTS/DCTS handshake of listening between B, C.After A and the D end of transmission, if the new destination node of node A is B, C or F, then the DRTS in wave beam 4 direction can transfer of data between interfering nodes B, C; And A carries out repetitive requests until return omni-directional mode after B terminates with C transmission and reply.Hidden node problem can have a strong impact on systematic function, and this problem ubiquity in based on the wlan system of switched beam antenna.In order to solve hidden node problem new in the wlan system based on switched beam antenna, the invention provides the directed connection control method that in a kind of WLAN, idle node is auxiliary, it is the directed connection control method that a kind of idle node is assisted, its main thought is: idle node monitors network condition, utilizes the information list of self maintained to judge current transmission condition; When the node terminating transmission causes when interference existing transmission and sends NIP in new transmission direction, block its transmission on interference radiating way.
Three category nodes are comprised: source node, destination node, idle neighbor node in implementation procedure of the present invention.Source node refers to that data need the node sent, and destination node refers to the node receiving source node data, and idle neighbor node refers in source node coverage, is in the node of idle condition.
Consult Fig. 1, concrete performing step is as follows:
Step 1: after node A, D terminate transmission, when source node A has data to need to send to destination node F, first source node A wants monitor channel, check that whether channel is idle, namely first to check in information list the mode of operation that whether buffer memory destination node F is corresponding, if there is buffer memory, then check whether oriented network allocation vector DNAV value is 0 under the mode of operation that destination node F is corresponding, if without buffer memory, then check whether the DNAV value under source node default mode of operation is 0.DNAV is the channel idle under this mode of operation of 0 expression; DNAV is not that this mode of operation lower channel of 0 expression takies, and needs to wait for until DNAV value is decremented to 0.
In the present invention, following field is comprised in information list: neighbors address, mode of operation, DNAV, signal strength signal intensity RSSI, information effective time.For node E, provide the nodal information list that it is safeguarded, see table 1.
The information list of table 1 idle node E
Neighbors address: for recording the mac address information of adjacent node, " AddrA " represent the MAC Address of node A, " AddrB " represent the MAC Address of Node B, by that analogy.
Mode of operation: select for the mode of operation of preserving when this node communicates with neighbors, the beam direction of the switched beam antenna namely used.Mode of operation number is relevant with antenna beam number, if node has the wave beam that M kind is different, M is positive integer, then mode of operation can be expressed as 0 ~ M-1, and 0 represents default mode.
DNAV: for recording the channel duration of neighbors reservation on certain beam direction, with 0, T1, T2 ... represent.T1, T2 ... be not 0, represent in the corresponding mode of operation of this duration internal congestion.DNAV is that this beam direction upper signal channel of 0 expression is idle.
RSSI: for the signal strength signal intensity of the neighbor node that minute book ground node receives, unit dBm, with 0, P1, P2, P3 ... represent, P1, P2, P3 ... be not 0.Utilize the RSSI of Received signal strength to estimate two nodes whether beyond coverage.
Information effective time: whether expired for judging the information of current preservation, with 0, Tlive1, Tlive2, Tlive3 ... represent, Tlive1, Tlive2, Tlive3 ... be not 0, represent not out of date.If this field is 0, represent expired, then delete this data item information, to ensure real-time and the validity of current information.
Node E analyzes the information in this information list, judges current network transmission situation, makes dataframe, reception, assists and avoid the decision-makings such as co-channel interference.
Step 2: source node A owing to leaking the handshake of listening between B, C, therefore blocks on interfering beam 4 direction, and source node A sends DRTS to destination node F.
Step 3: according to information list, idle neighbor node E, after wave beam 2 direction receives DRTS signal, judges whether source node causes interference to present communications.If be judged as interference, then idle neighbor node has sent NIP to source node A, blocks it and sends; If be judged as noiseless, then without the need to sending NIP.Consult Fig. 2, concrete deterministic process is as follows:
(1) idle neighbor node E is by the address of DRTS signal acquisition source node A, the address of destination node F, duration, signal strength information.And estimated the position of source node A by the angle of arrival information of DRTS signal, and obtain the label of the switched beam antenna orientation works pattern of corresponding this direction source node A.
(2) search " the neighbors address " in information list, determine whether the address of source node A exists.
Have no resolution if a searches, lost efficacy deleted from the information of the information or source node A that do not hear source node A before explanation, then in information table, added new data item for source node A.
If b finds source node A, then its information is upgraded." mode of operation " in information list is updated to acquired orientation works pattern label.And " the information effective time " of its correspondence is updated to current time.
(3) idle neighbor node E checks the DNAV value of all nodes identical with source node A " mode of operation ".
If a existence is not the value of 0, then send NIP to source node A.
If b is all 0, then check the DNAV value under the contrary beam direction of source node A.
(4) the DNAV value under the contrary beam direction of source node A is not 0, by RSSI corresponding for source node A and the node communicated under contrary beam direction and DNAV value be not then 0 RSSI corresponding to node be added, if be greater than threshold value, judge that source node A is the concealed nodes of Node B, C.For avoiding concealed nodes to disturb, idle neighbor node E sends the NIP comprising Node B, C address and DNAV value to source node A, the DNAV value that after source node A receives this packets of information, in lastest imformation list, B, C are corresponding also stops transfer of data; If be less than threshold value, then illustrate that source node A is beyond the coverage of Node B, C, therefore there is not co-channel interference.After adding RSSI judgement, can judge whether source node affects current transmission more accurately, and then suppress the generation of concealed nodes interference.Threshold value described in concrete deterministic process is S0+S1.Wherein, signal is S0 in the signal strength signal intensity of transmitting terminal, and the interference signal intensity that receiving terminal receives is S1, and the communication that receiving terminal is current under this interference signal is not interrupted.In a wlan, S0 value is that 20dBm, S1 value is between-75dBm ~ 10dBm.
(5) if the DNAV value under the contrary beam direction of source node A is 0 entirely, or the RSSI value after being added is less than threshold value, then idle neighbor node E checks the information whether being cached with destination node F in information list.
(6) if be cached with the information of destination node F in the information list of idle neighbor node E, then check whether the DNAV value of all nodes identical with destination node F " mode of operation " is 0.
If a existence is not the value of 0, then send NIP to source node A.
If b does not have the DNAV value of the information of buffer memory destination node F or the node identical with destination node F " mode of operation " to be 0 entirely, then only need upgrade the DNAV value under source node A respective antenna pattern.
Step 4: when the transmission request that source node A initiates causes interference to present communications, source node A receives NIP, then temporary block transmission, and upgrade the value of the DNAV on sending direction, then returns step 1, waits for that the value of DNAV is again send request after 0;
Step 5: when the transmission request that source node A initiates is not disturbed present communications, after source node A receives the DCTS of destination node F transmission, antenna mode is adjusted to the mode of operation of aiming at destination node F by source node A;
Step 6: source node A sends packet and waits for the arrival of the orientation response DACK information that destination node F sends;
Step 7: source node A receives DACK, then this time send successfully, return step 1.
To sum up, for the hidden node problem that switched beam antenna brings, the present invention adopts and introduces the auxiliary method of idle node.Idle neighbor node, according to information list, judges concealed nodes and sends NIP to block its transmission on interference radiating way, avoid leaking due to handshake listening the hidden node problem caused.In the present invention simultaneously, whether source node causes interference to present communication node to utilize RSSI value to judge further, such a process increases parallel transmission node logarithm in system, improves channel utilization.
The part do not described in detail in present embodiment belongs to the known conventional means of the industry, does not describe one by one here.More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (3)
1. the directed connection control method that in WLAN, idle node is auxiliary, is characterized in that, comprise the steps:
Step 1: when source node has data to need to send, first monitor channel, checks that whether channel is idle; First to check in information list the mode of operation that whether buffer memory destination node is corresponding, if there is buffer memory, then check whether oriented network allocation vector DNAV value is 0 under the mode of operation that destination node is corresponding; If without buffer memory, then the DNAV value of checking under source node default mode of operation whether be under this mode of operation of 0 expression if being 0, DNAV channel idle, DNAV is not that this mode of operation lower channel of 0 expression takies, and needs to wait for until DNAV value is decremented to 0; Wherein, source node refers to that data need the node sent, and destination node refers to the node receiving source node data;
The field comprised in described information list is: neighbors address, mode of operation, DNAV, signal strength signal intensity RSSI and information effective time; At each node buffer memory information list, and send DRTS information according to the orientation request received, continuous lastest imformation list;
Wherein, neighbors address is for recording the mac address information of adjacent node;
Mode of operation is selected for the mode of operation of preserving when this node communicates with neighbors, the beam direction of the switched beam antenna namely used; Default mode of operation is the widest wave beam in omni-beam or all wave beams, or from all wave beams a wave beam of Stochastic choice;
DNAV for recording the channel duration of the reservation of neighbors on certain beam direction, in the corresponding mode of operation of this duration internal congestion;
RSSI is used for the signal strength signal intensity of the neighbor node that minute book ground node receives;
Whether information is expired for judging the information of current preservation for effective time, if expired, deletes this data item information, to ensure real-time and the validity of current information;
Step 2: after source node listens to channel idle, sends DRTS to destination node;
Step 3: after receiving DRTS signal, according to information list, idle neighbor node judges whether source node causes interference to present communications; If be judged as interference, then idle neighbor node has sent neighbor information bag NIP to source node, blocks it and sends; If be judged as noiseless, then without the need to any process; Wherein idle neighbor node refers in source node coverage, is in the node of idle condition;
Step 4: when the transmission request that source node is initiated causes interference to present communications, source node receives NIP, then temporary block transmission, and upgrade the value of the DNAV on sending direction, then returns step 1, waits for that the value of DNAV is again send request after 0;
Step 5: when the transmission request that source node is initiated is not disturbed present communications, source node receives after orientation that destination node directional beam sends allows to send DCTS information, antenna mode is adjusted to the mode of operation of aiming at destination node by source node, i.e. optimal mode;
Step 6: source node sends packet and waits for the arrival of the orientation response DACK information that destination node directional beam is sent;
Step 7: source node receives DACK, then this time send successfully, return step 1.
2. the directed connection control method that in a kind of WLAN as claimed in claim 1, idle node is auxiliary, it is characterized in that, according to the information list of self, the idle neighbor node described in step 3 judges whether source node causes the concrete deterministic process of interference as follows to present communications:
(1) idle neighbor node is by DRTS signal acquisition source node address, destination node address, duration, signal strength information, and estimated the position of source node by the angle of arrival information of DRTS signal, and obtain the label of the switched beam antenna orientation works pattern of this direction source node corresponding;
(2) search the neighbors address in information list, determine whether the address of source node exists,
If do not find source node, lost efficacy deleted from the information of the information or source node that do not hear source node before explanation, then in information table, added new data item for source node;
If find source node, then its information is upgraded, the mode of operation in information list is updated to acquired orientation works pattern label, and the information of its correspondence is updated to current time effective time;
(3) idle neighbor node checks the DNAV value of all nodes identical with source node mode of operation, is not the value of 0, then sends NIP to source node if exist; If be all 0, then check the DNAV value under the contrary beam direction of source node;
(4) the DNAV value under the contrary beam direction of source node is not 0, be then added by the RSSI that RSSI corresponding for source node is corresponding with the node communicated under contrary beam direction, if the value be added is greater than threshold value, then sends NIP to source node; If be less than threshold value, then illustrate that source node is beyond the coverage just at communication node, then do not exist co-channel interference; The node communicated wherein under contrary beam direction is the node that DNAV value is not 0;
(5) the DNAV value under the contrary beam direction of source node is 0 entirely, or the RSSI value after being added is less than threshold value, then check in information list whether be cached with destination node information;
(6) if be cached with destination node information in the information list of idle neighbor node, then check whether the DNAV value of all nodes identical with destination node mode of operation is 0, be not the value of 0 if exist, then send NIP to source node; If do not have the DNAV value of buffer memory destination node information or the node identical with destination node mode of operation to be 0 entirely, then only need upgrade the DNAV value under source node respective antenna pattern.
3. the directed connection control method that in a kind of WLAN as claimed in claim 2, idle node is auxiliary, it is characterized in that, according to the information list of self, idle neighbor node described in step 3 judges that the threshold value described in whether source node causes in the concrete deterministic process of interference (4) step to present communications is S0+S1, wherein, signal is S0 in the signal strength signal intensity of transmitting terminal, the interference signal intensity that receiving terminal receives is S1, and the communication that receiving terminal is current under this interference signal is not interrupted.
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