CN100420249C - Method for guarantee service quality of radio local network - Google Patents
Method for guarantee service quality of radio local network Download PDFInfo
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Abstract
The present invention relates to a method for ensuring service quality in a wireless local area network, which belongs to the technical field of wireless communication. A time sensitive service is provided with a higher priority level in a priority level queue mode so that the delay of the time sensitive service is reduced; packets in the wireless local area network are divided into time sensitive packets and common data packets; a user of a time delay sensitive service submits an application to a wireless access point; the wireless access point after accepting the application records the service information and priorly transmits a data packet of the service, and a smoother is used for limiting the impact of data services on the network. A terminal submits an application to the wireless access point when the terminal needs to run the time sensitive service, and the application message comprises ports which the time sensitive service can use. Consequently, the delay ratio, the dithering ratio and the packet loss ratio of the time delay sensitive service are reduced to improve the transmission quality of the time delay sensitive service and provide a guaranteed speech peer-to-peer time sensitive service in the wireless local area network.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of quality of service method that priority is provided in WLAN (wireless local area network).
Background technology
In IEEE 802.11 WLAN of a large amount of layings now, it inserts and generally use distributed coordination function (Distributed CoordinatedFunction, DCF) agreement that defines in IEEE 802.11 standard.Document [1] IEEE 802.11 WG, " Part 11:Wireless LANMedium Access Control (MAC) and Physical Layer (PHY) Specification, " Aug.1999.DCF is based on the competition access way that the carrier sense multiple spot inserts and conflict is avoided, each terminal challenge access channel.Meeting monitor channel before each terminal access channel, if channel continues one period specific free time, then start fallback mechanism, setting up a fallback counter according to competition window begins to countdown, when counter reduce to zero and back off procedure in do not have terminal to utilize channel then to allow this terminal to send packet, otherwise start next the wait and back off procedure.This agreement is a kind of mechanism to all node fair competitions, do not provide service quality (Quality of Service, QoS) and the support of priority, cause in user's network delay, shake more for a long time very greatly, can't guarantee that multimedia service quality such as voice guarantees.When the forwarding that WAP (wireless access point) is wrapped, employing be simple fifo queue, equally not to the support of priority.And service quality (QoS) is meant the performance when data flow is passed through network, and it has a cover statistical measures index, comprises delay, shake, throughput and packet loss etc.Priority is meant that realization treats different demand users' graduation, provides different service quality at different needs.
In order to realize QoS and priority support, most improvement all is that (Media Access Control, MAC) layer carries out in media interviews control.Parameter when sending by adjusting the different brackets data such as arbitration frame interbody spacer (Arbitrary Inter Frame Space, AIFS), changes different brackets data such as competition window, rollback coefficient obtain the probability that channel access weighs makes the data of different brackets have different priority.IEEE 802.11e standard formulating is provided with four grades, and each grade has different parameters.Document [2] Yang Xiao, Haizhong Li, SunghyunChoi, " Protection and Guarantee for Voice and Video Traffic in IEEE 802.11eWireless LANs ", in Proc.IEEE INFOCOM, 2004.Its advantage be network utilization than higher, priority support preferably can be provided.But the standard of using these technology to support by the hardware vendor, and need be to the hardware replacing of upgrading, cost has increased the difficulty of its popularization and application than higher.And IEEE 802.11e standard is not also formally by becoming standard, so its extensive use also needs a period of time.If the driver layer in link layer realizes the priority support and just can realize the priority support by the mode of software upgrading.
Summary of the invention
An object of the present invention is to provide a kind of method for ensuring service quality that utilizes priority query, in the driver of wireless network card, priority query is set, for speech business provides the higher priority of giving out a contract for a project, utilize adaptive smooth device restricting data service traffics in slow Initiated Mechanism in the Transmission Control Protocol a large amount of in the data service and the data queue, thereby guarantee the service quality of speech business.
The present invention moves on the WAP (wireless access point) of WLAN (wireless local area network), and the access services of priority is provided for the terminal in the WLAN (wireless local area network).The present invention will be divided into two kinds in the business of transmission over networks: the professional and general data business of time-sensitive.The time-sensitive business is relatively more responsive to the delay of time, shake etc., to these parameter requests than higher, such as voice, recreation, video etc.The general data business is not too responsive to the time, such as file transfer protocol (FTP) (File Transfer Protocol, FTP), HTML (Hypertext Markup Language) (Hypertext Transfer Protocol, HTTP) business etc.The priority of time-sensitive business is higher than the general data business.
When terminal needs running time during sensitive traffic, file an application to WAP (wireless access point), comprise the professional port that can use of this time-sensitive in the solicitation message.WAP (wireless access point) can be according to the flow process of Fig. 4, and evaluation and test network performance this moment judges whether to admit this business then, if admit then send the bag that accepts request to the WAP (wireless access point) of sending application, and writes down information such as this terminal address, port numbers.When descending data arrive WAP (wireless access point), flow process according to figure six, the present invention can analyze packet, obtain its address and port information, carry out matching inquiry then, judge whether it is the time-sensitive business,, otherwise put into Low Priority Queuing if then put into high-priority queue.When carrying out the downstream packets transmission, at first inquire about high-priority queue, inquire about Low Priority Queuing then, so guaranteed the preferential transmission of high-priority queue.
The present invention requires to safeguard two data formations: high Priority Queues and Low Priority Queuing.What preserve in the high-priority queue is the time-sensitive business datum, adopt preferential (the EarliestDeadline First that expires the earliest, EDF) strategy is safeguarded, the time of sending is the latest calculated in speed, delay allowance according to each bag corresponding service needs, selects overdue the earliest bag to send then in formation.What preserve in the Low Priority Queuing is the general data business datum, and (First InFirst Out, FIFO) strategy is safeguarded to adopt first in first out.
The present invention only is divided into two types, two grades with the data on the network, in fact, is easy to the method that the present invention proposes is expanded to the more grade business of support according to thinking of the present invention.
The present invention is provided with grader, two-stage priority query, smoother and scheduler in the driver of IEEE 802.11 standard radio network interface cards, for speech business provides the higher priority of giving out a contract for a project, utilize adaptive smooth device restricting data service traffics in full Initiated Mechanism in the Transmission Control Protocol a large amount of in the data service and the data queue, thereby guarantee the service quality of speech business.The present invention is divided into professional and professional two grades of general data of time-sensitive with the data of transmission over networks on the WAP (wireless access point) of WLAN (wireless local area network), in conjunction with the different strategy of characteristic employing of each level data, thereby provide the assurance of service quality for business.The time-sensitive business has higher priority and can preferentially send, and two class queues safeguard that block diagram as shown in Figure 3.As shown in Figure 4, WAP (wireless access point) is handled the application of terminal traffic, judges whether to admit according to network performance.For WAP (wireless access point) as shown in Figure 5, according to the processing of classifying of address, the port information of this bag, deliver to different formations and safeguard the processing of downstream packets.In Fig. 6, showed the flow process that WAP (wireless access point) is given out a contract for a project and handled, respectively high-priority queue and Low Priority Queuing have been inquired about, and with the output speed of network smoother smoothes low priority packet.
Method for ensuring service quality in a kind of radio local network environment, adopt the mode of priority query, thereby provide higher priority to reduce its delay to the time-sensitive business, to be divided into time-sensitive business data packet and general service packet at the online bag of wireless local, when terminal needs running time during sensitive traffic, terminal is filed an application to WAP (wireless access point), comprise the professional port that can use of this time-sensitive in the solicitation message, WAP (wireless access point) is accepted to write down this business information after this application, and this professional packet preferentially sent, and utilize a smoother to come of the impact of restricting data business to network; When descending data arrive WAP (wireless access point), WAP (wireless access point) is analyzed packet, obtain its address and port information, carry out matching inquiry then, judge whether it is the time-sensitive business, if then packet is put into high-priority queue, otherwise packet is put into Low Priority Queuing.
The described mode that adopts priority query, be the two-stage priority scheduling to be set in each WAP (wireless access point), downlink data packet is analyzed, obtain its address and port information, carry out matching inquiry then, judge whether it is the time-sensitive business, the time-sensitive business data packet is put into high-priority queue, adopt the EDF strategy to dispatch; The general service packet is put into Low Priority Queuing, adopt the FIFO strategy to dispatch; When the distribution of wrapping, the bag in the priority scheduling high-priority queue.
The described smoother that utilizes comes the impact of restricting data business to network, be that WAP (wireless access point) utilizes the network smoother that the packet in the Low Priority Queuing is carried out smoothing processing, WAP (wireless access point) judges whether to send the data in the Low Priority Queuing of selection according to current network performance, reduce the impact of lower-priority data, smoothly its speed to network performance.
Described WLAN (wireless local area network) is IEEE 802.11 WLAN (wireless local area network), in fact according to thinking of the present invention, can expand to other WLAN (wireless local area network).
Description of drawings
Fig. 1 is IEEE 802.11 standard wireless network protocol stacks and position of the present invention.
Fig. 2 illustrates the network diagram that this method is suitable for.
Fig. 3 is the structured flowchart of this method.
Fig. 4 is a process chart of receiving bag from network interface card.
Fig. 5 is a process chart of receiving bag from the network protocol stack upper strata.
Fig. 6 is the process chart of giving out a contract for a project.
Embodiment
Fig. 1 is protocol of wireless local area network stack and position of the present invention, has illustrated that mechanism of the present invention is in protocol stack in the link layer, belongs to the wireless network card drive part.
Fig. 2 utilizes priority to guarantee the network diagram of WLAN service quality.The network diagram that this method is suitable for is described, as can be seen from the figure, a plurality of terminals are connected into the internet by a WAP (wireless access point), and its business roughly is divided into two classes: the professional and clear data business to time-sensitive.
Fig. 3 is the structured flowchart of this method, is classified by the bag that grader is sent upper-layer protocol, is divided into the professional and clear data business of time-sensitive, puts into high-priority queue and Low Priority Queuing respectively.Scheduler is got the bag transmission respectively from individual queue then.Smoother is responsible for the impact of restricting data business to network.
Fig. 4 is a process chart of receiving bag from network interface card.Mainly finish the processing procedure of the bag that network interface card receives from wireless channel.Key step is as follows:
S4.1: receive bag from network interface card;
S4.2:, judge whether it is bandwidth application frame to the time-sensitive Business Stream to the bag of the receiving processing of classifying; If the free responsive business of terminal use can be filed an application to WAP (wireless access point) according to its needed bandwidth, delay allowance, thereby send bandwidth application frame;
S4.3: if bandwidth application frame, then current network performance is evaluated and tested and judged whether to admit this Business Stream;
S4.4: if can admit, just send and accept frame, write down the identifying information and the parameter of this Business Stream simultaneously to the terminal of sending application;
S4.5:, just send reject frame to the terminal of sending application if can not admit;
S4.6: if not the application frame, then be the frame that needs the protocol stack upper strata to handle, deliver the upper strata and handle;
S4.7: wait for that network interface card receives next bag from wireless channel.
Fig. 5 is a process chart of receiving bag from the network protocol stack upper strata.Mainly finish give the processing procedure of the bag that comes from the protocol stack upper strata.Key step is as follows:
S5.1: receive bag from the protocol stack upper strata;
S5.2: downlink data packet is analyzed, obtained its address and port information, judge whether the time-sensitive Business Stream according to registered Business Stream log-on message in the WAP (wireless access point) then;
S5.3: if the time-sensitive business of having registered just adds in the high-priority queue;
S5.4: add in the Low Priority Queuing if not then wrapping;
S5.5: wait for bag from the protocol stack upper strata.
Fig. 6 is the process chart of giving out a contract for a project.The WAP (wireless access point) processing of giving out a contract for a project.Mainly finish the processing procedure that network interface card is outwards given out a contract for a project.Key step is as follows:
S6.1: when from the protocol stack upper strata or the network interface card interruption that sends end-of-packet will trigger the flow process of giving out a contract for a project when arriving;
S6.2: judge whether high-priority queue is empty;
S6.3: if non-NULL is then selected a bag based on EDF (Earliest Deadline First, it is preferential to expire the earliest) strategy from high-priority queue;
S6.4: if the high-priority queue sky judges then whether Low Priority Queuing is empty;
S6.5: if the Low Priority Queuing non-NULL is then therefrom selected a bag according to FIFO (First In First Out, first in first out) strategy;
S6.6: the bag that will select from Low Priority Queuing is delivered to the network smoother and is handled, and the network smoother judges whether to send current bag according to the current network characteristic, just sends if network performance is good, otherwise sends back in the Low Priority Queuing;
S6.7:, send if send to network interface card from the bag of high priority selection or the bag that obtains from the network smoother;
S6.8: wait for from the protocol stack upper strata or interruption that network interface card sends end-of-packet arrives.
Claims (7)
1. method for ensuring service quality in the radio local network environment, it is characterized in that, adopt the mode of priority query, thereby provide higher priority to reduce its delay to the time-sensitive business, to be divided into time-sensitive business data packet and general service packet at the online bag of wireless local, when terminal needs running time during sensitive traffic, terminal is filed an application to WAP (wireless access point), comprise the professional port that can use of this time-sensitive in the solicitation message, WAP (wireless access point) is accepted to write down this business information after this application, and this professional packet preferentially sent, and utilize a smoother to come of the impact of restricting data business to network; When descending data arrive WAP (wireless access point), WAP (wireless access point) is analyzed packet, obtain its address and port information, carry out matching inquiry then, judge whether it is the time-sensitive business, if then packet is put into high-priority queue, otherwise packet is put into Low Priority Queuing.
2. method for ensuring service quality in the radio local network environment according to claim 1, it is characterized in that, the described mode that adopts priority query, be the two-stage priority scheduling to be set, downlink data packet is analyzed, obtain its address and port information in each WAP (wireless access point), carry out matching inquiry then, judge whether it is the time-sensitive business, the time-sensitive business data packet is put into high-priority queue, adopt the EDF strategy to dispatch; The general service packet is put into Low Priority Queuing, adopt the FIFO strategy to dispatch; When the distribution of wrapping, the bag in the priority scheduling high-priority queue.
3. method for ensuring service quality in the radio local network environment according to claim 1, it is characterized in that, the described smoother that utilizes comes the impact of restricting data business to network, be that WAP (wireless access point) utilizes the network smoother that the packet in the Low Priority Queuing is carried out smoothing processing, WAP (wireless access point) judges whether to send the data in the Low Priority Queuing of selection according to current network performance, reduce the impact of lower-priority data, smoothly its speed to network performance.
4. method for ensuring service quality in the radio local network environment according to claim 1 is characterized in that, described WLAN (wireless local area network) is IEEE 802.11 WLAN (wireless local area network).
5. method for ensuring service quality in the radio local network environment according to claim 1 is characterized in that, the WAP (wireless access point) handling process of giving out a contract for a project is as follows:
S6.1: when from the protocol stack upper strata or the network interface card interruption that sends end-of-packet will trigger the flow process of giving out a contract for a project when arriving;
S6.2: judge whether high-priority queue is empty;
S6.3: if non-NULL is then selected a bag based on the EDF strategy from high-priority queue;
S6.4: if the high-priority queue sky judges then whether Low Priority Queuing is empty;
S6.5: if the Low Priority Queuing non-NULL is then therefrom selected a bag according to the FIFO strategy;
S6.6: the bag that will select from Low Priority Queuing is delivered to the network smoother and is handled, and the network smoother judges whether to send current bag according to the current network characteristic, just sends if network performance is good, otherwise sends back in the Low Priority Queuing;
S6.7:, send if send to network interface card from the bag of high priority selection or the bag that obtains from the network smoother;
S6.8: wait for from the protocol stack upper strata or interruption that network interface card sends end-of-packet arrives.
6. method for ensuring service quality in the radio local network environment according to claim 1 is characterized in that, WAP (wireless access point) receives that from network interface card the processing procedure of bag is as follows:
S4.1: receive bag from network interface card;
S4.2:, judge whether it is bandwidth application frame to the time-sensitive Business Stream to the bag of the receiving processing of classifying; If the free responsive business of terminal use can be filed an application to WAP (wireless access point) according to its needed bandwidth, delay allowance, thereby send bandwidth application frame;
S4.3: if bandwidth application frame, then current network performance is evaluated and tested and judged whether to admit this Business Stream;
S4.4: if can admit, just send and accept frame, write down the identifying information and the parameter of this Business Stream simultaneously to the terminal of sending application;
S4.5:, just send reject frame to the terminal of sending application if can not admit;
S4.6: if not the application frame, then be the frame that needs the protocol stack upper strata to handle, deliver the upper strata and handle;
S4.7: wait for that network interface card receives next bag from wireless channel.
7. method for ensuring service quality in the radio local network environment according to claim 1 is characterized in that, to as follows from the processing procedure of protocol stack upper layer packets:
S5.1: receive bag from the protocol stack upper strata;
S5.2: downlink data packet is analyzed, obtained its address and port information, judge whether the time-sensitive Business Stream according to registered Business Stream log-on message in the WAP (wireless access point) then;
S5.3: if the time-sensitive business of having registered just adds in the high-priority queue;
S5.4: add in the Low Priority Queuing if not then wrapping;
S5.5: wait for bag from the protocol stack upper strata.
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| CN100438471C (en) * | 2005-12-08 | 2008-11-26 | 华为技术有限公司 | Service cut-in method for radio local network and radio local network system |
| CN100471140C (en) * | 2006-09-29 | 2009-03-18 | 华为技术有限公司 | Method for detecting QoS |
| CN101188509B (en) * | 2006-11-15 | 2011-10-05 | 富士通株式会社 | A method and system providing service quality guarantee for network service |
| CN101442821B (en) * | 2008-12-31 | 2011-03-09 | 阿德利亚科技(北京)有限责任公司 | Method and apparatus for optimizing ascending voice transmission in wireless LAN |
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| CN101668314B (en) * | 2009-09-01 | 2012-12-19 | 中兴通讯股份有限公司 | Data transmission method for wireless distribution system and device thereof |
| WO2011085515A1 (en) * | 2010-01-13 | 2011-07-21 | 上海贝尔股份有限公司 | Relay transmission method and apparatus thereof |
| CN101834787A (en) * | 2010-04-12 | 2010-09-15 | 中兴通讯股份有限公司 | Method and system for dispatching data |
| CN101834901B (en) * | 2010-05-04 | 2012-11-28 | 电子科技大学 | Network coordinate system input delay pre-treatment method based on t detection model |
| CN103200131B (en) * | 2013-04-03 | 2015-08-19 | 清华大学深圳研究生院 | A kind of data source and sink |
| CN106488384B (en) * | 2015-08-31 | 2020-02-21 | 电信科学技术研究院 | Method and device for sending data packet |
| CN109951507B (en) * | 2017-12-21 | 2021-12-14 | 中国电信股份有限公司 | Data transmission method, system, node and computer readable storage medium |
| CN111277993B (en) * | 2019-01-11 | 2021-11-26 | 维沃移动通信有限公司 | Method, communication device and medium for supporting time sensitive communication |
| CN111328148B (en) * | 2020-03-11 | 2023-04-07 | 展讯通信（上海）有限公司 | Data transmission method and device |
| CN112055382B (en) * | 2020-07-28 | 2024-04-12 | 西安空间无线电技术研究所 | Service access method based on refined distinction |
| CN113473539B (en) * | 2021-05-31 | 2022-07-05 | 荣耀终端有限公司 | Data transmission method and electronic equipment |
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