CN103249166B - The starting method of a kind of RTS/CTS mechanism and device, system - Google Patents
The starting method of a kind of RTS/CTS mechanism and device, system Download PDFInfo
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- CN103249166B CN103249166B CN201210022246.XA CN201210022246A CN103249166B CN 103249166 B CN103249166 B CN 103249166B CN 201210022246 A CN201210022246 A CN 201210022246A CN 103249166 B CN103249166 B CN 103249166B
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Abstract
The invention discloses the starting method of a kind of RTS/CTS mechanism, described method includes: access point AP controller AC receives self local each AP transmitting terminal information reported; AC, according to described each AP transmitting terminal information reported, has detected whether there is concealed nodes relation between AP; AC is according to the AP that the there is concealed nodes relation transmitting terminal information reported, it is determined that by the regulated station STA that concealed nodes affects, and generates controlled information and is handed down to the AP of described controlled STA association; Described AP receives described controlled information, and according to described controlled information, starts RTS/CTS mechanism when sending data to described controlled STA. Accordingly, the invention also discloses the device for starting RTS/CTS mechanism and system, reduce the interference that between system, AP causes due to hidden node problem, do not abuse again RTS/CTS mechanism, improve eat dishes without rice or wine utilization rate and system access ability.
Description
Technical field
The present invention relates to wireless access technology, particularly relate to starting method and device, the system of a kind of request to send/allowed to send (RTS/CTS, RequestToSend/ClearToSend) mechanism.
Background technology
Wireless local area network technology is a kind of wireless access technology being widely used at present, and this technology utilizes wireless signal to transmit user profile.
WLAN follows IEEE802.11 serial protocols, runs according to carrier sense conflict avoidance (CSMA/CA) mechanism. CSMA/CA mechanism support be a kind of simple distribution formula, based on competition access protocol, in this mechanism, communication entity is in the position of equity, collectively cover the communication entity in region and share channel, any communication entity all needs to carry out carrier sense before sending data, just can send data after waiting some cycles according to agreement regulation after listening to channel idle. Over a wireless medium, it not that each website " can hear " other all of websites. Some website possibilities " can hear " website exchanging one end in data, and " can not hear " website of far-end, and this has resulted in hidden node problem. Hidden node problem can produce two concealed nodes, sends data because of can't detect the other side mutually simultaneously, causes and is receiving the problem that side occurs to cause due to data collision normally receiving.
IEEE802.11 has founded RTS/CTS mechanism for solving hidden node problem. Transmitting station sends (RTS by sending request before data transmission, RequesttoSend) message request channel, receiving terminal is by sending clear to send (CTS, CleartoSend) message empties transit area, owing to RTS/CTS data packet length is very short, so the probability affected by concealed nodes is only small, improved the transmission robustness of data by RTS/CTS mechanism. Owing to RTS/CTS mechanism itself can take certain interface-free resources; in actual applications; in order to promote utilization rate of eating dishes without rice or wine; access point (AP; one threshold values would generally be set on AccessPoint); before frame sends, adopt RTS/CTS mechanism when the data packet length transmitted is higher than this threshold values, do not adopt RTS/CTS mechanism when the data packet length transmitted is lower than this threshold values. Obviously, the principle of this mechanism is to be affected probability according to shorter data by concealed nodes to formulate lower than long data, and this mechanism has a problem in that does not consider whether there is concealed nodes in practical situation; The RTS/CTS mechanism being additionally provided for long data in the environment do not have concealed nodes there is no meaning, and in the environment have concealed nodes, the protection mechanism of short data is not enough.
Along with increasing of WLAN devices, the probability that concealed nodes occurs increases, and the business experience of user is brought harmful effect. The interference brought due to hidden node problem between AP in wireless local area network (WLAN) system so that AP repeats to send the probability of data and increases, thus causing air-interface efficiency low, throughput of system declines.
Summary of the invention
In view of this, present invention is primarily targeted at starting method and device, system that a kind of RTS/CTS mechanism is provided, reduce interference between the AP brought due to hidden node problem in wireless local area network (WLAN) system, to promote air-interface efficiency and throughput of system.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
The invention provides the starting method of a kind of request to send/allowed to send RTS/CTS mechanism, described method includes:
Access point AP controller AC receives self local each AP transmitting terminal information reported;
AC, according to described each AP transmitting terminal information reported, has detected whether there is concealed nodes relation between AP;
AC is according to the AP that the there is concealed nodes relation transmitting terminal information reported, it is determined that by the regulated station STA that concealed nodes affects, and generates controlled information and is handed down to the AP of described controlled STA association;
Described AP receives described controlled information, and according to described controlled information, starts RTS/CTS mechanism when sending data to described controlled STA.
In such scheme, before described AC receives self local each AP transmitting terminal information reported, described method also includes:
Each AP local for described AC performs following action respectively: each blank-interface text received is resolved, extract the transmitting terminal information of each blank-interface text, and give described AC by the transmitting terminal information reporting that extracts, described transmitting terminal information include the transmitting terminal of blank-interface text MAC Address and and described AP between incidence relation information.
In such scheme, described AC, according to described each AP transmitting terminal information reported, has detected whether there is concealed nodes relation between AP, including:
All transmitting terminal information that each AP is reported by described AC resolve, if all transmitting terminal information that any two AP reports meet following condition, then judge between said two AP as concealed nodes relation, otherwise, judge to be absent from concealed nodes relation between said two AP: all transmitting terminal information that two AP report all do not comprise the MAC Address of the other side, and the MAC Address that a transmitting terminal information reporting of one of them AP comprises same STA with another AP transmitting terminal information reported.
In such scheme, described AC is according to the AP that the there is concealed nodes relation transmitting terminal information reported, it is determined that by the regulated station STA that concealed nodes affects, and generates controlled information, including:
All transmitting terminal information that the AP of concealed nodes each other is reported by described AC resolve, based on following condition, determine controlled STA, generate controlled information: the MAC Address that the transmitting terminal information that in the AP of concealed nodes, AP reports each other comprises same STA with another AP transmitting terminal information reported, the incidence relation information having transmitting terminal information to comprise the built vertical association of described STA and AP self in the transmitting terminal information that one AP reports, the transmitting terminal information that another AP reports there is transmitting terminal information comprise described STA and AP self and do not set up the incidence relation information of association, and have transmitting terminal information to comprise the incidence relation information of the built vertical association of other STA and AP except described STA self, then determine that described STA is controlled STA, it is controlled STA that generation is used for indicating described STA, and associate the controlled information of the AP of described STA.
Present invention also offers a kind of AC for starting RTS/CTS mechanism, described AC includes: first receives unit, detection unit, generation unit and transmitting element, wherein,
First receives unit, for receiving the local each AP of AC self the transmitting terminal information reported;
Detection unit, for receiving, according to described first, the transmitting terminal information that unit receives, has detected whether there is concealed nodes relation between AP;
Generate unit, for the testing result according to described detection unit, the transmitting terminal information that the AP that there is concealed nodes relation is reported, it is determined that by the controlled STA that concealed nodes affects, generate controlled information;
Transmitting element, for being handed down to the AP of described controlled STA association by the controlled information that described generation unit generates.
In such scheme, described detection unit specifically for: receive all transmitting terminal information of receiving of unit to described first and resolve, if all transmitting terminal information that any two AP reports meet following condition, then judge between said two AP as concealed nodes relation, otherwise, judge to be absent from concealed nodes relation between said two AP: all transmitting terminal information that two AP report all do not comprise the MAC Address of the other side, and the MAC Address that a transmitting terminal information reporting of one of them AP comprises same STA with another AP transmitting terminal information reported.
In such scheme, described generation unit specifically for: all transmitting terminal information that the AP of concealed nodes each other is reported resolve, based on following condition, determine controlled STA, generate controlled information: the MAC Address that the transmitting terminal information that in the AP of concealed nodes, AP reports each other comprises same STA with another AP transmitting terminal information reported, the incidence relation information having transmitting terminal information to comprise the built vertical association of described STA and AP self in the transmitting terminal information that one AP reports, the transmitting terminal information that another AP reports there is transmitting terminal information comprise described STA and AP self and do not set up the incidence relation information of association, and have transmitting terminal information to comprise the incidence relation information of the built vertical association of other STA and AP except described STA self, then determine that described STA is controlled STA, it is controlled STA that generation is used for indicating described STA, and associate the controlled information of the AP of described STA.
Present invention also offers a kind of AP for starting RTS/CTS mechanism, described AP includes: second receives unit and start unit, wherein,
Second receives unit, for receiving the AC controlled information issued;
Start unit, for receiving, according to described second, the controlled information that unit receives, starts RTS/CTS mechanism when sending data to controlled STA.
In such scheme, described second receives unit, is additionally operable to receive blank-interface text;
Described AP also includes: report unit, and each blank-interface text received for receiving unit to described second resolves, and extracts the transmitting terminal information of each blank-interface text, and by the transmitting terminal information reporting that extracts to described AC.
Present invention also offers a kind of system for starting RTS/CTS mechanism, described system includes: for starting described in AC machine-processed for RTS/CTS and at least one claim 8 or 9 for starting the AP of RTS/CTS mechanism described in any one of claim 5 to 7.
In such scheme, described system also includes: at least one STA, for sending blank-interface text to the AP being used for starting RTS/CTS mechanism described at least one.
The starting method of RTS/CTS of the present invention mechanism and device, system, concealed nodes and the STA that affected by concealed nodes in detection wireless network, RTS/CTS mechanism is opened when only impacted STA being carried out data transmission, avoid the blindness opening/close RTS/CTS mechanism in traditional method according to data packet length, reduce the interference that between system, AP causes due to hidden node problem, do not abuse again RTS/CTS mechanism, and improve, by the means of reduction system internal interference, eat dishes without rice or wine utilization rate and system access ability.
The application present invention, it is possible to provide support by the mode of software upgrading on existing AP/AC framework basis, it does not have AP/AC hardware is proposed special requirement, it is easy to accomplish; And the method that the present invention describes fully complies with IEEE802.11 serial protocols, is not required to agreement is expanded, has good compatibility. Additionally, also help lifting Consumer's Experience, set up high performance radio local area network network.
Accompanying drawing explanation
Fig. 1 is the flowchart of the starting method of RTS/CTS of the present invention mechanism;
Fig. 2 is the concealed nodes scene schematic diagram of the embodiment of the present invention one;
Fig. 3 is the non-concealed node scene schematic diagram of the embodiment of the present invention one;
Fig. 4 is the flowchart enabling RTS/CTS mechanism under scene shown in Fig. 2.
Detailed description of the invention
The basic thought of the present invention is: detect the concealed nodes relation between each AP, detected there is concealed nodes relation between AP time, enable RTS/CTS mechanism, to data transmit provide protection.
The starting method of a kind of RTS/CTS mechanism of the present invention mainly may include steps of:
Step 101:AP controller (AC, APController) receives self local each AP transmitting terminal information reported;
In practical application, the startup system of RTS/CTS mechanism can include three kinds of communication entities of AP, AC and STA. STA is as user terminal, and with AP by air interface interactive information, this air interface meets IEEE802.11 series of canonical; AP accesses upper layer network by physical link; AC as parametric controller, AP and AC route up to and can interactive media/control information. AC preserves AP list, this AP list indicates with MAC Address each AP of described AC administration.
According to the working mechanism of IEEE802.11 definition, AP follows CSMA/CA mechanism sending before data all the time in a receive mode; In such a mode, AP continues to intercept blank-interface text, then processes as received the aerial message of IEEE802.11. Including the source address of transmitting terminal in this aerial message, this source address is the global unique mac address of 48, is used as the unique identifying information of transmitting terminal. In practical application, the transmitting terminal of the blank-interface text received by AP can be the STA etc. in other AP, described AP coverage. Define according to IEEE802.11, described aerial message also includes the type information of transmitting terminal, may determine that transmitting terminal is AP or STA based on the type information.
Define according to IEEE802.11, STA with AP normal communication before need to set up incidence relation with AP, AP and STA sets up with AP by managing the mutual of frame or cancels incidence relation; Once the incidence relation of AP and STA is set up, AP can distribute the indications of a called after AID (AssociationIdentifier) and inform to STA by management frame to STA and by AID; By the method for regularly transmission detection frame, STA, AP for being associated with AP can guarantee that this STA is whether still in its coverage.
Here, each AP local for described AC performs following action respectively: each blank-interface text received is resolved, extract the transmitting terminal information of each blank-interface text, and give described AC by the transmitting terminal information reporting that extracts, described transmitting terminal information can include the type information of transmitting terminal as described blank-interface text, MAC Address and and described AP between incidence relation information.
Step 102:AC is according to described each AP transmitting terminal information reported, and whether detect has between AP in described each AP to there is concealed nodes relation;
In practical application, if two AP can not receive the blank-interface text mutually sent, then two AP can not avoid sending data by CSMA/CA mechanism coordination simultaneously; If two AP can receive the blank-interface text of same STA, then this STA is likely simultaneously received two AP blank-interface text sent, now the blank-interface text of two AP transmissions will it may happen that collide and cause that STA cannot parse any one blank-interface text at STA place, in this case two AP concealed nodes each other, and STA is in the repetition overlay area of two concealed nodes, affected by concealed nodes. Therefore, when meeting following condition, it is determined that there is the relation of hiding between two AP: whether can receive blank-interface text that the other side sends between two AP and whether said two AP is able to receive that the blank-interface text of same STA.
Specifically, all transmitting terminal information that each AP is reported by AC resolve, if all transmitting terminal information that any two AP reports meet following condition, then judge between said two AP as concealed nodes relation, otherwise, it is determined that be absent from concealed nodes relation between said two AP: all transmitting terminal information that two AP report all do not comprise the MAC Address of the other side; The MAC Address that the transmitting terminal information that the transmitting terminal information that one of them AP reports and another AP report comprises same STA.
Step 103: detected there is concealed nodes relation between AP time, AC is according to the AP that the there is concealed nodes relation transmitting terminal information reported, determine by the regulated station (STA that concealed nodes affects, Station), generate controlled information, and described controlled information is handed down to the AP of described controlled STA association;
Here, if two AP of concealed nodes are able to receive that the blank-interface text of same STA each other, this STA associates with one of them AP, with another AP dereferenced, and (namely this AP has established incidence relation with other arbitrary STA for empty with the AP load of described STA dereferenced, no matter whether other STA are in the repetition overlay area of these two AP), then AC determines that described STA is the controlled STA affected by concealed nodes, and generates the controlled information for indicating controlled STA.
Specifically, all transmitting terminal information that the AP of concealed nodes each other is reported by described AC resolve, based on following condition, determine controlled STA, generate controlled information: the MAC Address that the transmitting terminal information that in the AP of concealed nodes, AP reports each other comprises same STA with another AP transmitting terminal information reported, the incidence relation information having transmitting terminal information to comprise the built vertical association of described STA and AP self in the transmitting terminal information that one AP reports, the transmitting terminal information that another AP reports there is transmitting terminal information comprise described STA and AP self and do not set up the incidence relation information of association, and have transmitting terminal information to comprise the incidence relation information of the built vertical association of other STA and AP except described STA self, determine that described STA is controlled STA, it is controlled STA that generation is used for indicating described STA, and associate the controlled information of the AP of described STA.
Step 104: the AP of described controlled STA association receives described controlled information, and according to described controlled information, start RTS/CTS mechanism when sending data to described controlled STA.
Here, AP enables RTS/CTS mechanism when sending data to controlled STA, does not start RTS/CTS mechanism, send data according to normal mechanism when sending data to uncontrolled STA.
Specifically; when sending data; AP judges that the MAC Address receiving the STA of data is consistent with the MAC Address of described controlled STA; then it is judged to send data to controlled STA; start RTS/CTS mechanism; judge that the MAC Address receiving the STA of data is inconsistent with the MAC Address of described controlled STA, be then judged to send data to uncontrolled STA, send data according to normal mechanism.
During practical application, AP according to the controlled information received, can also set up a controlled list, comprise the MAC Address of all controlled STA in this controlled list. Before sending data; first AP inquires about the controlled list of self; if the STAMAC address receiving described data is included in described controlled list; then described STA is controlled STA; AP enables RTS/CTS mechanism when sending data to described STA, if the MAC Address of STA is not included in described controlled list, then described STA is uncontrolled STA; AP does not start RTS/CTS mechanism when sending data to described STA, sends data according to normal mechanism.
Accordingly, present invention also offers a kind of AC for starting RTS/CTS mechanism, described AC includes: first receives unit, detection unit, generation unit and transmitting element, wherein,
First receives unit, for receiving the local each AP of AC self the transmitting terminal information reported;
Detection unit, for receiving, according to described first, the transmitting terminal information that unit receives, has detected whether there is concealed nodes relation between AP;
Generate unit, for the testing result according to described detection unit, the transmitting terminal information that the AP that there is concealed nodes relation is reported, it is determined that by the controlled STA that concealed nodes affects, generate controlled information;
Transmitting element, for being handed down to the AP of described controlled STA association by the controlled information that described generation unit generates.
Here, described detection unit specifically for: receive all transmitting terminal information of receiving of unit to described first and resolve, if all transmitting terminal information that any two AP reports meet following condition, then judge between said two AP as concealed nodes relation, otherwise, judge to be absent from concealed nodes relation between said two AP: all transmitting terminal information that two AP report all do not comprise the MAC Address of the other side, and the MAC Address that a transmitting terminal information reporting of one of them AP comprises same STA with another AP transmitting terminal information reported.
Here, described generation unit specifically for: all transmitting terminal information that the AP of concealed nodes each other is reported resolve, based on following condition, determine controlled STA, generate controlled information: the MAC Address that the transmitting terminal information that in the AP of concealed nodes, AP reports each other comprises same STA with another AP transmitting terminal information reported, the incidence relation information having transmitting terminal information to comprise the built vertical association of described STA and AP self in the transmitting terminal information that one AP reports, the transmitting terminal information that another AP reports there is transmitting terminal information comprise described STA and AP self and do not set up the incidence relation information of association, and have transmitting terminal information to comprise the incidence relation information of the built vertical association of other STA and AP except described STA self, then determine that described STA is controlled STA, it is controlled STA that generation is used for indicating described STA, and associate the controlled information of the AP of described STA.
Present invention also offers a kind of AP for starting RTS/CTS mechanism, described AP includes: second receives unit and start unit, and wherein, second receives unit, for receiving the AC controlled information issued; Start unit, for receiving, according to described second, the controlled information that unit receives, starts RTS/CTS mechanism when sending data to controlled STA.
Here, described second receives unit, is additionally operable to receive blank-interface text; Described AP also includes: report unit, and each blank-interface text received for receiving unit to described second resolves, and extracts the transmitting terminal information of each blank-interface text, and by the transmitting terminal information reporting that extracts to described AC.
Present invention also offers a kind of system for starting RTS/CTS mechanism, described system includes: above-mentioned for starting AC machine-processed for RTS/CTS and at least one above-mentioned AP for starting RTS/CTS mechanism.
Here, described system also includes: at least one STA, for sending blank-interface text at least one above-mentioned AP for starting RTS/CTS mechanism.
Embodiment one
The scene schematic diagram of Fig. 2 and Fig. 3 respectively concealed nodes and non-concealed node.
In fig. 2, STA_1 is associated on AP_1, STA_2 is associated on AP_2, STA_2 is in the overlay area of AP_1 and AP_2, AP_1 and AP_2 is not mutually in the overlay area of the other side, AP_1 cannot listen to the AP_2 signal sent, and AP_2 also cannot listen to the AP_1 signal sent, and can not avoid sending data by CSMA/CA mechanism between AP_1 and AP_2 simultaneously.
For the scene shown in Fig. 2, if AP_2 sends data to STA_2 while AP_1 transfers data to STA_1, the data being simultaneously emitted by due to AP_1 and AP_2 are collided at STA_2 place and causes that STA_2 cannot receive and normally receive the AP_2 data sent, between AP_1 and AP_2, constitute concealed nodes. Specifying according to the agreement of IEEE802.11, STA_2 cannot receive when normally receiving the AP_2 data sent, and also cannot reply ACK message and confirm to AP_2, and AP_2 can resend data to STA_2 when time-out does not receive ACK message. So, due to constitute between AP_1 and AP_2 the interference that brings of concealed nodes cause data repeat send, the efficiency eated dishes without rice or wine can be reduced, reduce the handling capacity of system. Therefore, the machine-processed data that AP_2 is sent to STA_2 of RTS/CTS be must flow through for this scene and protected, reduce the probability that interference occurs in system, STA_2 just can be made can be properly received the AP_2 data sent, it is to avoid Data duplication transmission.
In figure 3; STA_1 is associated on AP_1; STA_2 is associated on AP_2; STA_2 is in the overlay area of AP_1 and AP_2; AP_1 and AP_2 is respectively in the overlay area of the other side; both sides can detect mutually the data that the other side sends, and can pass through CSMA/CA mechanism coordination and send data, it is not necessary to by RTS/CTS mechanism, the transmission of data is protected between AP_1 and AP_2.
Below for Fig. 2 scene described, the process that implements of the present invention is elaborated.
As shown in Figure 4, for the scene shown in Fig. 2, the flow process starting RTS/CTS mechanism may include steps of:
Step 301, each blank-interface text received is resolved by AP_1 and AP_2 respectively, extracts the transmitting terminal information of each blank-interface text, and by the transmitting terminal information reporting that extracts to AC.
Here, described transmitting terminal information can include the type information of transmitting terminal as described blank-interface text, MAC Address and and AP between incidence relation information.
In the present embodiment, comprise STA_1 and STA_2, AP_1 in AP_1 coverage and receive the blank-interface text from STA_1 and STA_2, from described blank-interface text, extract the first transmitting terminal information and the second transmitting terminal information respectively and be sent to AC. Here, the first transmitting terminal information includes: represent the STA mode information of STA_1 type, the MAC Address MAC_1 and expression STA_1 of STA_1 set up, with AP_1, the incidence relation information associated; Second transmitting terminal information includes: represent the STA mode information of STA_2 type, the MAC Address MAC_2 and expression STA_2 of STA_2 do not set up, with AP_1, the incidence relation information associated.
Only comprise STA_2, AP_2 in AP_2 coverage and receive the blank-interface text from STA_2, from described blank-interface text, extract the 3rd transmitting terminal information and be sent to AC. Here, the 3rd transmitting terminal information includes: represent the STA mode information of STA_2 type, the MAC Address MAC_2 and expression STA_2 of STA_2 set up, with AP_2, the incidence relation information associated.
For the scene shown in Fig. 2, AP_1 does not send blank-interface text to AP_2, and AP_2 does not also send blank-interface text to AP_1.
Step 302, whether AC, according to AP_1 and the AP_2 transmitting terminal information reported, is concealed nodes relation between detection AP_1 and AP_2, if it is, continue step 303, otherwise, terminates current process.
Specifically, all transmitting terminal information that AP_1 and AP_2 is reported by AC resolve, if meeting following two conditions, then judge between AP_1 and AP_2 as concealed nodes relation:
(1) all transmitting terminal information that AP_1 and AP_2 reports all do not comprise the MAC Address of the other side;
(2) all transmitting terminal information that AP_1 reports have the MAC Address that the transmitting terminal information that transmitting terminal information and AP_2 report comprises same STA.
In the present embodiment, all transmitting terminal information that AP_1 and AP_2 is reported by AC resolve, obtain AP_1 the first transmitting terminal information reported and the second transmitting terminal information and the 3rd transmitting terminal information that AP_2 reports meets above-mentioned condition (1), and the second transmitting terminal information that AP_1 reports meets above-mentioned condition (2) with AP_2 the 3rd transmitting terminal information reported, therefore, AC judges between AP_1 and AP_2 as concealed nodes relation.
Step 303:AC is according to AP_1 and the AP_2 transmitting terminal information reported, it is determined that controlled STA, generates controlled information, and is handed down to by described controlled information and the controlled STA AP associated;
Specifically, being primarily due to AP_1 the second transmitting terminal information reported and the 3rd transmitting terminal information that AP_2 reports all comprises the MAC Address of STA_2, therefore, AC determines that STA_2 is controlled STA; Secondly, represent that STA_2 does not set up, with AP_1, the incidence relation information associated owing to AP_1 the second transmitting terminal information reported comprising, the 3rd transmitting terminal information that AP_2 reports comprises and represents that STA_2 sets up, with AP_2, the incidence relation information associated, therefore, AC determines that STA_2 and AP_2 is associated, with AP_1 dereferenced; Finally, represent that STA_1 sets up, with AP_1, the incidence relation information associated owing to AP_1 the second transmitting terminal information reported comprising, therefore, AC determines that AP_1 load is not for sky, based on factor determined above, AC generates the controlled information representing " STA_2 of AP_2 association is controlled STA ", and this controlled information is sent to AP_2.
Here, described controlled information can also comprise the MAC Address of AP_2 and/or the MAC Address of STA_2. In practical application, AC can send described controlled information based on the MAC Address of AP_2 in described controlled information, it is also possible to inquires about the MAC Address of AP_2 from the AP list of self-management, and the MAC Address based on the AP_2 inquired sends described controlled information.
Step 304, AP_2 receives described controlled information, and according to described controlled information, enables RTS/CTS mechanism when sending data to STA_2, by RTS/CTS mechanism to the DEP being sent to STA_2, it is to avoid the potential interference that hidden node problem is brought.
Here, AP_2 based on the MAC Address of STA_2 in described controlled information, can enable RTS/CTS mechanism when sending data to STA_2. Or; AP_2 can according to the instruction of described controlled information; the MAC Address of STA_2 is inquired about from the STA list of self-management; and based on the MAC Address of the STA_2 inquired; RTS/CTS mechanism is enabled, thereby through RTS/CTS mechanism to the DEP being sent to STA_2 when sending data to STA_2.
The above, be only presently preferred embodiments of the present invention, is not intended to limit protection scope of the present invention.
Claims (7)
1. the starting method of a request to send/allowed to send RTS/CTS mechanism, it is characterised in that described method includes:
Access point AP controller AC receives self local each AP transmitting terminal information reported;
AC, according to described each AP transmitting terminal information reported, has detected whether there is concealed nodes relation between AP;
AC is according to the AP that the there is concealed nodes relation transmitting terminal information reported, it is determined that by the regulated station STA that concealed nodes affects, and generates controlled information and is handed down to the AP of described controlled STA association;
Described AP receives described controlled information, and according to described controlled information, starts RTS/CTS mechanism when sending data to described controlled STA;
Wherein, described AC is according to the AP that the there is concealed nodes relation transmitting terminal information reported, it is determined that by the regulated station STA that concealed nodes affects, and generates controlled information, including:
All transmitting terminal information that the AP of concealed nodes each other is reported by described AC resolve, based on following condition, determine controlled STA, generate controlled information: the MAC Address that the transmitting terminal information that in the AP of concealed nodes, AP reports each other comprises same STA with another AP transmitting terminal information reported, the incidence relation information having transmitting terminal information to comprise the built vertical association of described STA and AP self in the transmitting terminal information that one AP reports, the transmitting terminal information that another AP reports there is transmitting terminal information comprise described STA and AP self and do not set up the incidence relation information of association, and have transmitting terminal information to comprise the incidence relation information of the built vertical association of other STA and AP except described STA self, then determine that described STA is controlled STA, it is controlled STA that generation is used for indicating described STA, and associate the controlled information of the AP of described STA.
2. starting method machine-processed for RTS/CTS according to claim 1, it is characterised in that before described AC receives self local each AP transmitting terminal information reported, described method also includes:
Each AP local for described AC performs following action respectively: each blank-interface text received is resolved, extract the transmitting terminal information of each blank-interface text, and give described AC by the transmitting terminal information reporting that extracts, described transmitting terminal information include the transmitting terminal of blank-interface text MAC Address and and described AP between incidence relation information.
3. the starting method of RTS/CTS according to claim 1 or claim 2 mechanism, it is characterised in that described AC, according to described each AP transmitting terminal information reported, has detected whether there is concealed nodes relation between AP, including:
All transmitting terminal information that each AP is reported by described AC resolve, if all transmitting terminal information that any two AP reports meet following condition, then judge between said two AP as concealed nodes relation, otherwise, judge to be absent from concealed nodes relation between said two AP: all transmitting terminal information that two AP report all do not comprise the MAC Address of the other side, and the MAC Address that a transmitting terminal information reporting of one of them AP comprises same STA with another AP transmitting terminal information reported.
4. AC one kind machine-processed for starting RTS/CTS, it is characterised in that described AC includes: first receives unit, detection unit, generation unit and transmitting element, wherein,
First receives unit, for receiving the local each AP of AC self the transmitting terminal information reported;
Detection unit, for receiving, according to described first, the transmitting terminal information that unit receives, has detected whether there is concealed nodes relation between AP;
Generate unit, for the testing result according to described detection unit, the transmitting terminal information that the AP that there is concealed nodes relation is reported, it is determined that by the controlled STA that concealed nodes affects, generate controlled information;
Transmitting element, for being handed down to the AP of described controlled STA association by the controlled information that described generation unit generates;
Wherein, described generation unit specifically for:
All transmitting terminal information that the AP of concealed nodes each other is reported resolve, based on following condition, determine controlled STA, generate controlled information: the MAC Address that the transmitting terminal information that in the AP of concealed nodes, AP reports each other comprises same STA with another AP transmitting terminal information reported, the incidence relation information having transmitting terminal information to comprise the built vertical association of described STA and AP self in the transmitting terminal information that one AP reports, the transmitting terminal information that another AP reports there is transmitting terminal information comprise described STA and AP self and do not set up the incidence relation information of association, and have transmitting terminal information to comprise the incidence relation information of the built vertical association of other STA and AP except described STA self, then determine that described STA is controlled STA, it is controlled STA that generation is used for indicating described STA, and associate the controlled information of the AP of described STA.
5. according to claim 4 for starting the AC of RTS/CTS mechanism, it is characterized in that, described detection unit specifically for: receive all transmitting terminal information of receiving of unit to described first and resolve, if all transmitting terminal information that any two AP reports meet following condition, then judge between said two AP as concealed nodes relation, otherwise, judge to be absent from concealed nodes relation between said two AP: all transmitting terminal information that two AP report all do not comprise the MAC Address of the other side, and the MAC Address that a transmitting terminal information reporting of one of them AP comprises same STA with another AP transmitting terminal information reported.
6. one kind for start RTS/CTS mechanism system, it is characterised in that described system includes: described in claim 4 or 5 for start RTS/CTS mechanism AC and at least one for start RTS/CTS mechanism AP.
7. according to claim 6 for starting the system of RTS/CTS mechanism, it is characterised in that described system also includes: at least one STA, for sending blank-interface text to the AP being used for starting RTS/CTS mechanism described at least one.
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| CN104754601B (en) * | 2013-12-26 | 2019-01-08 | 中国移动通信集团公司 | A kind of concealed nodes detection method, network node and server |
| WO2016086985A1 (en) * | 2014-12-03 | 2016-06-09 | Nokia Solutions And Networks Oy | Hidden node detection in lte licensed assisted access |
| CN105828353A (en) * | 2015-01-08 | 2016-08-03 | 中兴通讯股份有限公司 | Hidden station (STA) detection method, hidden STA detection system and station |
| CN105050197B (en) * | 2015-03-31 | 2018-09-14 | 魅族科技（中国）有限公司 | A kind of wireless communications method, relevant device and system |
| CN105263158B (en) * | 2015-09-06 | 2018-10-23 | 江苏中兴微通信息科技有限公司 | The detection method of concealed nodes pair in a kind of enhanced wireless LAN |
| GB2577867B (en) * | 2018-09-28 | 2022-10-26 | Tcl Communication Ltd | Conflict avoidance in a cellular network |
| CN113242610B (en) * | 2021-05-13 | 2022-06-07 | 电子科技大学 | Cumulant-based communication signal correlation method |
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