CN1929446A - Fast detecting method for transmission abnormality of wireless LAN IP multicast - Google Patents
Fast detecting method for transmission abnormality of wireless LAN IP multicast Download PDFInfo
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Abstract
This invention relates to wireless local network transmission abnormal rapid test method, which comprises the following steps: a, wireless interface device receives data package through aim wireless customer end authorization, if customer end has no message in hardware buffer area or maximum values is larger than zero or less than permitted message number then sending data package into hardware buffer, otherwise discarding data package and sending back transfer; b, after data sending, wireless interface device judges failure and to record continuous times and reduce customer end permitted message number, when times achieve preset maximum values then determining customer abnormal situation.
Description
Technical field
The implementation method of IP multicasting technology service application when the present invention relates to wireless local area network building in the field of wireless communication relates in particular to the method for IEEE 802.11 wireless lan (wlan)s transmission IP multicast frame.
Background technology
WLAN (wireless local area network) is as a kind of access technology of the network terminal, possesses the access speed height, advantages such as it is simple and easy to connect up, more and more be widely used in home network, along with the continuous development of broadband and video compression technology, promptly increasing in the demand of Network Transmission based on the multimedia of video and voice.Current popular multimedia application, real-time, interactive, IPTV application such as (Internet Protocol TV) as video and voice, all require than higher network bandwidth support, use an important directions that becomes Future Development gradually by the wireless local area network technology transmitting multimedia.
Traditional IEEE 802.11 WLAN (wireless local area network) are the data Application Design, support to multicast application is more weak, after a multicast message arrival of multicast source transmission WAP (wireless access point), wireless access this multicast message of naming a person for a particular job sends to related wireless client, but other wireless clients that do not belong to this multicast group and be associated with this WAP (wireless access point) also can be received this multicast message.
When IEEE 802.11 WLAN (wireless local area network) transmission destination addresses are clean culture (Unicast) data message of wireless client MAC Address, after the unicast message that WAP (wireless access point) sends arrives wireless client, the wireless client that receives data sends 802.11 and confirms that (ACK) frame is to WAP (wireless access point), if access point apparatus does not receive the ACK frame of wireless client, the PHY layer can retransmit this frame, if number of retransmissions surpasses pre-set threshold, then abandon these data.In 802.11 higher wireless networks of interference ratio, 802.11 ACK provide reliable data transmission mechanism.Access point apparatus can also be by receiving 802.11 ACK frames and other management or the Frame of wireless client, detect the signal quality of wireless client, and adjust the data transmission rate of wireless client in real time according to signal quality, further can guarantee the reliable transmission of data.
During IEEE 802.11 wireless local network transmission group broadcastings (Multicast) data message, 802.11 agreement regulation, the wireless client of being responsible for receiving group can not send 802.11 ACK frames to WAP (wireless access point), cause WAP (wireless access point) to can not determine whether wireless client has correctly received multicast frame, because do not have affirmation retransmission mechanism and other the reliable mechanism that guarantees of 802.11 ACK, the transmission reliability of multicast packet is lower.
Do not send 802.11 ACK frames to WAP (wireless access point) owing to be responsible for the wireless client of receiving group simultaneously, WAP (wireless access point) also just can not detect recipient's signal quality by the multicast message that sends.When the multicast message that transmits between WAP (wireless access point) and the wireless client occupies main flow, because WAP (wireless access point) can not detect recipient's signal quality and the data transmission rate of adjusting wireless client according to signal quality in real time, can cause the error rate that multicast message sends in certain period to increase, the reliability of muticast data transmission further reduces.
Based on the IPTV live broadcast service of IP multicast, the unicast message of transmitting between WAP (wireless access point) and the wireless client is less, and the IP multicast message has occupied main bandwidth.When the signal quality between WAP (wireless access point) and wireless client changes, can not in time adjust the multicast message transmission rate between WAP (wireless access point) and the wireless client, causing multicast message to send the error rate increases, simultaneously because the multicast frame between WAP (wireless access point) and the wireless client does not have acknowledgment of receipt mechanism, the transmission reliability of multicast frame is lower, it is not smooth broadcast often to occur, and traffic affecting is carried out.
It is to be sent to all wireless clients that WAP (wireless access point) sends multicast message, WAP (wireless access point) can both receive multicast frame in order to guarantee all wireless clients, usually WAP (wireless access point) sends multicast frame with the most conservative data rate, be generally 1Mbps as 802.11b, 802.11a/g be generally 2Mbps, but the above-mentioned multicast frame data transmission rate of actual bandwidth ratio is also low, this is for needing 2Mbps even the more multimedia application such as the IPTV business of high bandwidth at least, bandwidth is obviously not enough, and traffic affecting is normally carried out.If fixed configurations than higher multicast packet transmission rate, can cause some lower wireless client of signal quality correctly not receive, particularly change when the change wireless client that causes and the signal quality between WAP (wireless access point) of environment such as the distance between wireless client and the WAP (wireless access point), barrier, if the multicast transmission rate between WAP (wireless access point) and wireless client can not be adjusted in real time, higher multicast then can occur and send the error rate, cause correctly receiving group message of wireless client.Therefore the transmission rate that needs to increase multicast is to improve bandwidth, and the multicast transmission rate must be supported and can adjust in real time.
In actual applications, because the influence of radio physical layer retransmission mechanism, too much re-transmission appears if send to the data of a client, to cause the data of other clients not to be sent out, therefore at the real-time business of having relatively high expectations, radio reception device must fast detecting go out unusual client, and handles, and guarantees to occur can not influencing other clients unusually a client.Common way is that an ageing time is set, and for example 5 minutes, if do not have data interaction between client and the WAP (wireless access point) in 5 minutes, just thinks that client is unusual.But this way can not detect in real time, and reaction speed is slower.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method for quick of Wireless LAN IP multicast transmission anomaly, can fast detecting go out abnormal user end, avoids unnecessary data to retransmit, and improves the reliability of IP multicast transmission.
In order to solve the problems of the technologies described above, the invention provides a kind of method for quick of Wireless LAN IP multicast transmission anomaly,
Processing when message sends comprises:
(a) radio reception device is received packet, after the Target Wireless client authentication of described packet passed through, if described destination client does not have message in described hardware buffer district, perhaps, if it is non-vanishing that described destination client allows to send into the maximum of message number in described hardware buffer district, and the message data of described destination client in described hardware buffer district allows to send into the maximum of the message number in described hardware buffer district less than this destination client, then this packet is sent into described hardware buffer district, increase the message number in described hardware buffer district, otherwise, abandon described packet;
The processing that sends it back timing comprises:
(b) after data are sent completely, reduce the message number of described buffering area, radio reception device sends failure if judge this packet, record sends the frequency of failure continuously, reduce the message number that this destination client permission is sent into to radio reception device hardware buffer district, if judge that this packet sends successfully, then increase the message number that this destination client permission is sent into to radio reception device hardware buffer district; When the errors number of continuous transmission has reached predefined greatest measure, assert that then client is unusual.
Further, said method also can have following characteristics: in described step (a), if it is non-vanishing that described destination client allows to send into the maximum of message number in described hardware buffer district, and the message data of described destination client in described hardware buffer district allows to send into the maximum of the message number in described hardware buffer district less than this destination client, judge that then whether the difference that sends current transmitting time and last time Time To Failure is less than preset threshold, if then abandon this packet, otherwise this packet is sent into described hardware buffer district.
Further, said method also can have following characteristics: in described step (b), the message number that this destination client of described increase allows to send into to radio reception device hardware buffer district is meant, the maximum message segment number that this client is allowed to send into buffering area is adjusted into, numerical value after the maximum message segment number of current permission doubles and the minimum value between the buffering area maximum length.
Further, said method also can have following characteristics: in described step (b), describedly reduce the message number that this destination client allows to send into to radio reception device hardware buffer district and be meant, the maximum message segment number that this client is allowed to send into buffering area directly is adjusted into zero, numerical value after the maximum message segment number that the maximum message segment number that perhaps this client is allowed to send into buffering area is adjusted into current permission reduces by half and the minimum value between the buffering area maximum length.
Further, said method also can have following characteristics: radio reception device is compared the maximum message segment number that this client allows to send into buffering area with 1, if smaller or equal to 1, the maximum message segment number that then this client is allowed to send into buffering area directly is adjusted into zero, otherwise, the maximum message segment number that this client is allowed to send into buffering area is adjusted into, numerical value after the maximum message segment number of current permission reduces by half and the minimum value between the buffering area maximum length.
Further, said method also can have following characteristics: in described step (b), comprise that also the record current data sends the time of failure.
Further, said method also can have following characteristics: in described step (b), assert that client is unusual after, then disconnect and being connected of client.
Adopt the method for the invention, make in the WLAN (wireless local area network) product of setting up with IEEE 802.11a/b/g standard and wireless standard IEEE 802.11n of future generation, can fast detecting go out unusual client, avoid influence to other clients, overcome the defective of IEEE 802.11 transport multicast message poor reliability, guaranteed based on the reliable application of the net cast business of IP multicasting technology at the WLAN (wireless local area network) product, greatly expand the range of application of WLAN (wireless local area network) product, promoted the development of Wireless LAN IP multicast service application.
Description of drawings
Fig. 1 is an IP multicast transmission equipment drawing of the present invention;
Fig. 2 is an IP multicast transmission system application drawing of the present invention;
Fig. 3 is the scheme module map of IP multicast transmission of the present invention;
Fig. 4 is the application exemplary plot of IP multicast transmission of the present invention;
Fig. 5 is the unusual client detection messages of present embodiment transmission flow figure;
Fig. 6 is mediated the reason flow chart for the unusual client detection messages of present embodiment sends it back.
Embodiment
As shown in Figure 1, the wireless access point device of transmission IP multicast is made up of radio interface module, multicast member management module, upstream Interface module, 802.1d bridge module, IP routing module, protocol application module and Configuration Manager.The message that the radio interface module of equipment receives is forwarded to the upstream Interface module through 802.1d bridge module or IP routing module, and the message that the upstream Interface module receives is forwarded to radio interface module through 802.1d bridge module or IP routing module.Then send by the multicast member management resume module when radio interface module or upstream Interface module receive IGMP (Internet igmpinternet) message or IP multicast message: the multicast member management resume module is safeguarded the multicast member tabulation from the IGMP message that radio interface module receives; The IP multicast message that the upstream Interface module receives further is forwarded to the multicast member management resume module through 802.1d bridge module or IP routing module, by the multicast member management module IP multicast message is forwarded to radio interface module.Wherein:
Radio interface module, comprise wireless driver module and hardware interface, wherein wireless driver module is used to receive and send management of 802.11 between WAP (wireless access point) and wireless client and Frame, and, adjust in real time and " best unicast message transmission rate " that definite WAP (wireless access point) sends to wireless client reaches " best broadcasting packet transmission rate " according to detecting the signal quality that is connected of WAP (wireless access point) and wireless client in real time with mutual 802.11 frames of wireless client;
The multicast member management module is used to safeguard multicast member tabulation and the mac address information that writes down the multicast member wireless client, also is responsible for the IP multicast message between reception and forwarding multicasting source and multicast member wireless client;
802.1d bridge module and IP routing module are used for the message routing and E-Packet;
The upstream Interface module, comprise driving and the upstream hardware interface, be used to connect external network, as the interface of Internet, can receive Internet in succession by connecting equipment rooms such as DSLAM, switch, BRAS, described upstream Interface can be interfaces such as Ethernet interface, xDSL interface, xPON;
The protocol application module and the Configuration Manager of equipment are used to finish variety of protocol and upper layer application, and the configuration management of Local or Remote.
The IP multicast transmission system is used as shown in Figure 2, comprises wireless client, WAP (wireless access point), compartment system (DS) and multicast source in the application system of IP multicast transmission at least.Wireless client need ask to add or when leaving certain multicast group of multicast source, IGMP (IGMP) message that wireless client sends sends to multicast source through WAP (wireless access point), and the wireless access wireless client of naming a person for a particular job joins this multicast group.When multicast source sent certain IP multicast message to the member of multicast group, the IP multicast message that multicast source sends sent to member's wireless client of multicast group through WAP (wireless access point), finishes the transmission of IP multicast.
Wherein: multicast source is used to send the IP multicast message; Compartment system is used to connect WAP (wireless access point) and multicast source; One or more WAP (wireless access point) are used for the IP multicast message is treated to unicast message and sends to wireless client, and handle adding that wireless client sends or the solicited message of leaving multicast group; One or more wireless clients are to use the user of multicast service, can send the request that adds or leave multicast group to WAP (wireless access point).
As shown in Figure 3, in the WAP (wireless access point) that realizes the described high speed reliable transmission of this programme multicast message, comprise wireless driver module, multicast member management module.In wireless driver module, all preserve a best unicast message transmission rate at each wireless client, when each wireless client newly is linked into WAP (wireless access point), wireless driver module is determined this wireless client " best unicast message transmission rate ", perhaps when " the best unicast message transmission rate " of wireless client when changing in real time, wireless driver module is selected minimum " best unicast message transmission rate " value in all clients, send " the best broadcasting packet transmission rate " of other broadcast group broadcast messages (being non-IP multicast message) as WAP (wireless access point) to each wireless client, described " best broadcasting packet transmission rate " also can be described as " best multicast message transmission rate ", is the shared speed of all clients.
The multicast member tabulation, member's wireless client client information of record multicast group and multicast group, each multicast group has a multicast member tabulation, by multicast member management module Dynamic Maintenance, can be stored in the multicast member management module, wherein wireless client information comprises the mac address information of wireless client.
In concrete the application as shown in Figure 4.In the WLAN (wireless local area network) product of setting up with IEEE 802.11a/b/g standard and wireless standard IEEE 802.11n of future generation, wireless access point device inserts a plurality of wireless client STA.Wireless client sends the IGMPReport request that joins message of IGMP multicast to WAP (wireless access point) and adds certain IP multicast group, and perhaps wireless client sends IGMP multicast leave message IGMP Leave request to WAP (wireless access point) and leaves certain IP multicast group.The multicast member management module of WAP (wireless access point) adds or leave message from the IGMP multicast that wireless driver module receives wireless client, the information such as MAC (medium access control) address of tabulation of Dynamic Maintenance multicast member and wireless client.
In existing IEEE 802.11a/b/g wireless lan network and wireless standard IEEE802.11n wireless lan network of future generation, the transmission method of IP multicast message may further comprise the steps:
Step 110, the IP multicast message that sends from multicast source arrives WAP (wireless access point);
Step 120, the multicast member management module searches multicast member tabulation in the WAP (wireless access point) judges whether the multicast group of this IP multicast message correspondence has the multicast member wireless client in the multicast member tabulation, if have, then carry out next step, otherwise, this IP multicast message abandoned;
Step 130, the multicast member management module is carried out the processing that multicast message changes unicast message with the IP multicast message, the multicast destination address of IP multicast message is replaced to the MAC Address of member's wireless client in this multicast group;
If wireless client has a plurality of, then the target MAC (Media Access Control) address of IP multicast message is replaced with successively the MAC Address of each wireless client in the multicast group, every replacement primary address sends once, all sends up to all member's wireless clients in multicast group to finish.
Step 140, the multicast member management module is forwarded to wireless driver module with this IP multicast message with the form of unicast message;
Step 150, the wireless driver module member's wireless client in multicast group sends the IP multicast message;
If the message destination address that wireless driver module sends is the MAC Address of wireless client, then " the best unicast message transmission rate " according to each wireless client sends to wireless client, and radio reception device is determined best unicast message transmission rate according to 802.11 messages of the wireless client that receives in advance.
Step 160, wireless client are returned acknowledge message after receiving message.
WAP (wireless access point) receives the reliable transmission of 802.11 acknowledgement frames (ACK) the assurance data of wireless client.
Other enter broadcasting (Broadcast) the categorical data message of WAP (wireless access point) and multicast (Multicast) the categorical data message of non-IP multicast, do not need to give the multicast member management module, directly give wireless driver module and send.The broadcasting that wireless driver module sends and other multicast messages send with " best broadcasting packet transmission rate ".
Send multicast frame with common WAP (wireless access point) with the most conservative data rate and (be generally 1Mbps as 802.11b, 802.11a/g be generally 2Mbps) compare, when " the best unicast message transmission rate " of each wireless client all is higher than the most conservative data rate, just " best broadcasting packet transmission rate " when being higher than the most conservative data rate, can improve the transmission rate of multicast message.
In the WLAN (wireless local area network) product with IEEE 802.11a/b/g standard and wireless standard IEEE 802.11n of future generation, device of wireless local area network access point is by being converted to the IP multicast wireless client unicast mac address method of message, the IP multicast message that multicast source sends to WAP (wireless access point) can send to the multicast member wireless client of IP multicast correspondence respectively, message between different multicast group does not influence mutually, simultaneously because message is the wireless client of sending to unicast message, its speed and reliability reach the Performance And Reliability index of unicast message, have guaranteed based on the reliable application at the WLAN (wireless local area network) product of the net cast business of IP multicasting technology.
In existing IEEE 802.11a/b/g wireless lan network and wireless standard IEEE802.11n wireless lan network of future generation, the technical scheme of realization IP multicast transmission anomaly fast detecting is divided into the data transmission and sends it back mediates two parts of reason.When message sends, radio reception device is received packet, after the Target Wireless client authentication of described packet passed through, judge according to the message number that this destination client allows to send into to radio reception device hardware buffer district, if this destination client allows to send into message to described hardware buffer district, then this packet is sent into described hardware buffer district, otherwise, described packet abandoned; When sending it back timing, radio reception device sends failure if judge this packet, then reduces the message number that this destination client permission is sent into to radio reception device hardware buffer district.
Initialization criterion parameter at first, each client all has following these parameters.
Current transmitting time Current_time, the time that expression current data packet (message) is put into radio reception device hardware buffer district;
Sent Time To Failure Time_i last time, represented that i client packet last time sent the time of failure;
Send improper value Tx_err_i continuously, i client sends the packet number of failure continuously;
Buffering area message number P KT_i, the number of i client packet in hardware queue;
Allow maximum message segment number MAX_PKT_i, i client allows the maximum of packet number in the hardware queue;
Continuous Time To Failure threshold value Min_time_gap, client allows the maximum of the time difference of double transmission failure, for example, the moment that i data of client contract out existing mistake is Ti, (the individual data of j＞i) wrap in and are placed into the hardware buffer formation is Tj to j constantly, i mistake do not occur sending to the packet between the j, and we check the time difference of Tj and Ti, and this time difference can not be less than Min_time_gap;
Continuous failure threshold value Max_allow_err, client allows to send continuously the maximum of the frequency of failure;
Formation maximum length MAX_TX_QUEUE_LEN, the number of all packets in the hardware buffer district.
Message sends handling process, as shown in Figure 5, may further comprise the steps:
Step 5-1, after radio reception device was received packet, whether whether the Target Wireless client of judging this packet related (promptly having the authority accesses network), if do not have association then abandon data, otherwise, execution in step 5-2;
Step 5-2 judges whether the maximum MAX_PKT_i that this destination client allows to send into the message number in hardware buffer district is 0, if, execution in step 5-3, otherwise, execution in step 5-4;
Step 5-3, message number P KT_i in the hardware buffer district judges have in the hardware buffer district whether message is arranged according to this destination client, if having, then abandons current data, otherwise, current data is delivered to the hardware buffer district, the PKT_i value is added 1, wait data to be sent;
In another embodiment, after step 5-2 judges that MAX_PKT_i is zero, also direct packet discard, and do not carry out the judgement of step 5-3, the packet that mails to this client after so all can be dropped, and just can receive packet after having only this client to reconnect.
Step 5-4, judge this destination client in the hardware buffer district message number P KT_i whether less than the maximum MAX_PKT_i of the message number that allows, if, carry out next step, otherwise, then abandon data;
Step 5-5, more current transmitting time Current_time and last time send Time To Failure Time_i, if the time difference less than preset threshold Min_time_gap, packet discard then, otherwise packet is sent into the hardware buffer district adds 1 with the PKT_i value;
In another embodiment, also can not carry out the comparison of time difference, and directly packet be sent into the hardware buffer district, the PKT_i value is added 1.
Data send it back mediates reason (hardware is finished the readjustment after the transmission, is used to notify the upper layer data bag to send situation, comprises successfully failure or the like), as shown in Figure 6:
Step 6-1, after data were sent completely, radio reception device subtracted 1 with hardware buffer district message number P KT_i;
Step 6-2, radio reception device judge whether physical layer normally sends data, if, resetting sends error statistics numerical value Tx_err_i, with allowing the numerical value MAX_PKT_i that sends into the hardware buffer district to transfer greatly, waits for sending readjustment simultaneously next time, otherwise, carry out next step;
The maximum message segment number that buffering area can be allowed be adjusted into MIN, and (MAX_PKY_i*2 AX_TX_QUEUE_LEN), promptly allows maximum message segment number MAX_PKY_i to take advantage of 2 and the minimum value of buffering area maximum length between the two.
Step 6-3, Tx_err_i adds 1 with the data transmission errors statistical value;
Step 6-4 compares the maximum message segment number MAX_PKT_i that allows in the buffering area with 1, if smaller or equal to 1 then execution in step 6-5, otherwise execution in step 6-6;
Purpose relatively is that MAX_PKT_i is adjusted into zero, in other embodiments, also can compare with other numerical value, and the note if MAX_PKT_i does not start from scratch then also can be adjusted into it other numerical value, is convenient to judge when data send.
Step 6-5, it is zero that the maximum message segment number MAX_PKT_i that allows in the buffering area is set, execution in step 6-7;
Step 6-6 turns the maximum message segment number MAX_PKT_i that allows in the buffering area down execution in step 6-7;
The maximum message segment number MAX_PKT_i that allows can be adjusted into MIN (MAX_PKT_i/2,1), the maximum message segment number of the permission after promptly reducing by half and 1 the two minimum value.
Step 6-7, the record current data sends the time T ime_i of failure;
Step 6-8 judges whether the errors number Tx_err_i that sends has continuously reached predefined greatest measure Max_allow_err, if then disconnect and being connected of client, otherwise wait for sending and adjust back next time.
Disconnect with being connected of client after, the wireless driver module in the wireless access point device can notify the multicast administration module to delete this client from the multicast member tabulation.
The present invention detects according to the wireless network links situation in data exchange process, and has adopted sensitive numerical value control method, and it is unusual to find in the extremely short time that therefore client takes place, and avoids too much re-transmission.
This method has overcome the defective of the low poor reliability of IEEE 802.11 transmission IP multicast message bandwidth, greatly expanded the application of WLAN (wireless local area network) product, particularly based on the application of the net cast business of IP multicasting technology, for the WLAN (wireless local area network) product provides strong assurance popularizing with development of home network at the WLAN (wireless local area network) product.
Claims (7)
1, a kind of method for quick of Wireless LAN IP multicast transmission anomaly,
Processing when message sends comprises:
(a) radio reception device is received packet, after the Target Wireless client authentication of described packet passed through, if described destination client does not have message in described hardware buffer district, perhaps, if it is non-vanishing that described destination client allows to send into the maximum of message number in described hardware buffer district, and the message data of described destination client in described hardware buffer district allows to send into the maximum of the message number in described hardware buffer district less than this destination client, then this packet is sent into described hardware buffer district, increase the message number in described hardware buffer district, otherwise, abandon described packet;
The processing that sends it back timing comprises:
(b) after data are sent completely, reduce the message number of described buffering area, radio reception device sends failure if judge this packet, record sends the frequency of failure continuously, reduce the message number that this destination client permission is sent into to radio reception device hardware buffer district, if judge that this packet sends successfully, then increase the message number that this destination client permission is sent into to radio reception device hardware buffer district; When the errors number of continuous transmission has reached predefined greatest measure, assert that then client is unusual.
2, method according to claim 1, it is characterized in that, in described step (a), if it is non-vanishing that described destination client allows to send into the maximum of message number in described hardware buffer district, and the message data of described destination client in described hardware buffer district allows to send into the maximum of the message number in described hardware buffer district less than this destination client, judge that then whether the difference that sends current transmitting time and last time Time To Failure is less than preset threshold, if then abandon this packet, otherwise this packet is sent into described hardware buffer district.
3, method according to claim 1, it is characterized in that, in described step (b), the message number that this destination client of described increase allows to send into to radio reception device hardware buffer district is meant, the maximum message segment number that this client is allowed to send into buffering area is adjusted into, numerical value after the maximum message segment number of current permission doubles and the minimum value between the buffering area maximum length.
4, method according to claim 1, it is characterized in that, in described step (b), describedly reduce the message number that this destination client allows to send into to radio reception device hardware buffer district and be meant, the maximum message segment number that this client is allowed to send into buffering area directly is adjusted into zero, numerical value after the maximum message segment number that the maximum message segment number that perhaps this client is allowed to send into buffering area is adjusted into current permission reduces by half and the minimum value between the buffering area maximum length.
5, as method as described in the claim 4, it is characterized in that, radio reception device is compared the maximum message segment number that this client allows to send into buffering area with 1, if smaller or equal to 1, the maximum message segment number that then this client is allowed to send into buffering area directly is adjusted into zero, otherwise the maximum message segment number that this client is allowed to send into buffering area is adjusted into, numerical value after the maximum message segment number of current permission reduces by half and the minimum value between the buffering area maximum length.
6, as method as described in the claim 4, it is characterized in that, in described step (b), comprise that also the record current data sends the time of failure.
7, method according to claim 1 is characterized in that, in described step (b), assert that client is unusual after, disconnect and being connected of client.
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| CNA2006101402553A CN1929446A (en) | 2006-10-20 | 2006-10-20 | Fast detecting method for transmission abnormality of wireless LAN IP multicast |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101583150B (en) * | 2009-06-18 | 2011-04-20 | 中兴通讯股份有限公司 | Method and device for detecting abnormity of wireless terminal through wireless access point |
| CN102821043A (en) * | 2012-07-27 | 2012-12-12 | 浪潮(北京)电子信息产业有限公司 | Control method and device |
| CN108632646A (en) * | 2017-03-20 | 2018-10-09 | 腾讯科技（深圳）有限公司 | A kind of net cast method, apparatus and server |
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2006
- 2006-10-20 CN CNA2006101402553A patent/CN1929446A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101583150B (en) * | 2009-06-18 | 2011-04-20 | 中兴通讯股份有限公司 | Method and device for detecting abnormity of wireless terminal through wireless access point |
| CN102821043A (en) * | 2012-07-27 | 2012-12-12 | 浪潮(北京)电子信息产业有限公司 | Control method and device |
| CN102821043B (en) * | 2012-07-27 | 2015-06-17 | 浪潮(北京)电子信息产业有限公司 | Control method and device |
| CN108632646A (en) * | 2017-03-20 | 2018-10-09 | 腾讯科技（深圳）有限公司 | A kind of net cast method, apparatus and server |
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