CN101394334B - Data packet scheduling transmitting device used for WLAN - Google Patents
Data packet scheduling transmitting device used for WLAN Download PDFInfo
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Abstract
The invention provides a data packet scheduling and transmitting method for a wireless local area network (LAN). In the wireless LAN, in order to achieve delayed distinction of applications with different priorities, a data packet scheduling and transmitting device is needed to realize data packet scheduling and transmission. Because of the parallel execution of the upper layer application transmitting process, multiple queues can cache a data packet transmitting request at the same moment, and a hardware transmitting circuit has to select a certain queue from all the queues as a queue to be transmitted and uses the first data packet of the queue as a data packet to be transmitted. The data packet scheduling and transmitting method and the hardware component can realize this function. The hardware component comprises a data packet scheduler, a hardware backoff circuit, and a transmitter buffer descriptor (TxBD). The device can realize channel access regulations required in wireless LAN standards and delay distinction of applications with different priorities.
Description
Technical field
The present invention relates to a kind of data packet scheduling transmitting device in wireless communication field, relate in particular to a kind of hardware component that utilizes packet scheduler to realize data packet dispatching and transmission in IEEE 802.11e or the IEEE 802.11n agreement.
Background technology
In order to support the application of deferred constraint, in WLAN (wireless local area network), the packet that needs to have the different priorities attribute sends by the different priorities sequential scheduling, and these rules are called data packet dispatching.Each packet can be in four priority.The DSCP thresholding mapping of priority of data packets from IP packet header obtains or obtains according to IEEE 802.11e agreement regulation.
For transmit leg, need from four priority queries, take out a packet and send.IEEE 802.11e agreement regulation should be carried out backoff procedure for all have data cached priority query.When wherein any one backoff procedure end, the packet that then takes out in the respective priority formation sends.This is the process of a virtual scheduling, that is, though there is not scheduler entities, in fact a plurality of backoff procedure executed in parallel have played the effect of scheduler.
Send in the process of packet at a STA, because the upper layer application executed in parallel, therefore, the packet that belongs to the different priorities application may require to send simultaneously.Do not having under the situation of hardware constraints, sending hardware circuit and can and safeguard a storage organization, up to the complete transmission of this packet for each newly arrived packet foundation.
The packet that different priorities is used requires simultaneously to send and will cause the backoff procedure executed in parallel.In the process of backoff procedure executed in parallel, a plurality of backoff procedure might occur and keep out of the way situation about finishing, i.e. intramural conflict simultaneously.At this moment, according to IEEE 802.11e agreement regulation, finish the backoff procedure of keeping out of the way and to notify mutually, and re-execute backoff procedure.This will cause the complicated of backoff procedure.Fig. 1 has shown the hardware unit that uses this method.
Because the restriction of hardware component aspect memory capacity, chip area and complexity, above-mentioned implementation method hardware cost height, therefore press for and use a kind of technology can in software, realize meeting IEEE 802.11e agreement predetermined data packet scheduler, and the prioritization of realization delay, reduce hardware spending.
Summary of the invention
The invention provides the method and apparatus that a kind of IEEE of realization 802.11e or IEEE 802.11n WLAN (wireless local area network) data packet dispatching send, in the hope of reaching the prioritization function that realizes delay with as far as possible little hardware cost and complexity, support the parallel processing of keeping out of the way intramural conflict simultaneously.
For realizing this goal, the invention discloses a kind of prioritization mechanism of utilizing and realize the method and apparatus that data packet dispatching sends, the present invention includes a data packet scheduler, a hardware backoff circuit, a transmission buffer descriptor TxBD.Wherein:
Described packet scheduler is realized by drive software, stipulate according to the IEEE802.11e agreement, according to the priority difference of priority transmit queue, be that each priority query distributes different parameters, comprise that competition window maximum, contention window minimum and arbitration frame interbody spacer count AIFSN.Packet scheduler is according to above-mentioned parameter, be respectively each priority query and calculate pseudorandom integer and AIFSN's and value, and the respective queue of definite and value minimum is as being chosen formation by packet scheduler, get this formation head of the queue packet as packet to be sent, deliver to hardware and send buffering area TxBuff.
Described hardware backoff circuit is arranged in hardware component, is used for the pseudorandom integer that calculates according to packet scheduler and AIFSN's and value, calculates back off time, and carries out backoff procedure according to back off time.Hardware backoff circuit external interface signal comprises:
Channel idle indication Channel idle signal, whether input signal is used to indicate current channel condition idle;
With value Sum signal, input signal, be used to indicate the described transmission buffer descriptor of claim 2 TxBD's and value (Sum) field value;
Time slot counting Tslot signal, input signal is used to indicate the timeslot number of current accumulative total;
Keep out of the way request Backoff Req signal, input signal is used to indicate whether to start back-off function;
Keep out of the way and finish Backoff Done signal, whether output signal is used for indicating to keep out of the way finishing.
Described transmission buffer descriptor TxBD, write down chosen the priority of formation, the pseudorandom integer value related and AIFSN by packet scheduler with this formation with value, packet memory address to be sent.Sending buffer descriptor TxBD field comprises:
With value Sum field, be used to write down the pseudorandom integer that calculates by packet scheduler and arbitration frame interbody spacer and count AIFSN's and value;
Priority P riority field is used to write down the priority of the formation of being selected by packet scheduler to be sent;
Frame address Frame Address field is used to write down the memory address by the packet to be sent of packet scheduler selection;
Number of retransmissions Retry Count field is used for record by the detected frame number of retransmissions of hardware transtation mission circuit.
Feature of the present invention in turn includes the following steps:
(1) after drive software receives packet, the number of stipulating according to the DSCP value or the IEEE 802.11e agreement of IP bag
According to packet priority, packet is put into the respective priority transmit queue, the priority transmit queue is given birth to by drive software
Become and maintenance;
(2) drive software is judged current event or interrupt type.If the upper layer data bag arrives, or hardware sends end, then by drive software be all for empty priority transmit queue calculates the pseudorandom integer, and pseudorandom integer calculations result obtained with the AIFSN addition and be worth, will write transmission buffer descriptor TxBD with value then;
What (3) packet scheduler of drive software maintenance judged whether a plurality of priority queries correspondence is identical value with value.If show intramural conflict take place this moment that according to IEEE 802.11e agreement regulation, behind the generation intramural conflict, step (2) is changeed in (1) exponential increase by formula of conflict priority query's competition window then; Otherwise change step (4).
CW(t)＝(CW(t-1)+1)×2-1 (1)
CW (t) is a t contention window size constantly in the formula (1), and CW (t-1) is a t-1 contention window size constantly.
(4) formation is chosen in the priority transmit queue that packet scheduler is selected and value the is minimum conduct of drive software maintenance, and the head of the queue packet that takes out this formation is moved hardware by bus Master equipment and sent buffering area TxBuff as packet to be sent;
(5) the hardware backoff circuit is calculated back off time according to the pseudorandom integer and AIFSN and the value that send among the buffer descriptor TxBD according to formula (2), and carries out backoff procedure with this time value;
BackoffTime＝Sum×aSlotTime (2)
Sum is that the pseudorandom integer that calculates of packet scheduler and arbitration frame interbody spacer are counted AIFSN's and value in the formula (2), and aSlotTime is every slot time length that agreement is stipulated, BackoffTime is a back off time.When packet scheduler has been selected transmit queue, then will keep out of the way request (Backoff_Req) signal and be changed to effectively.Keeping out of the way request signal effectively and time slot counting when equaling back off time, judging that channel idle indicates (Channel_idle) signal whether effective.If effectively, then explanation is kept out of the way to finish this moment, can send packet, will keep out of the way to finish output signal Backoff_Done and be changed to effectively.
(6) detect the channel busy-idle condition.If channel busy is then hung up current backoff procedure; Otherwise change step (7);
(7) the back off time value is successively decreased in time, when back off time is decremented to zero, hardware is sent packet among the buffer area TxBuff add the MAC head and send;
(8) detect re-transmission if send hardware unit, then send hardware unit current retransmission count aggregate-value write-back is sent buffer area descriptor TxBD retransmission count (Retry Count) field.If the retransmission count value is not 0, then drive software upgrades competition window according to formula (1), otherwise changes step (9);
(9) repeat said process, the packet in the priority transmit queue sends to finish or reach send opportunity TXOP maximum time and limits.
Description of drawings
Fig. 1 is a kind of apparatus structure schematic diagram of the IEEE of realization 802.11e packet virtual scheduling; This device has four priority transmit queues, four hardware send buffering area TxBuff, four hardware backoff circuit, does not have scheduler entities.
The apparatus structure schematic diagram that Fig. 2 sends for a kind of improved data packet dispatching of realizing on Fig. 1 basis; This device has packet scheduler, four priority transmit queues, a hardware transmission buffering area TxBuff, hardware backoff circuit that a software is realized.
The packet scheduler structural representation of Fig. 3 for providing among the present invention.
The hardware backoff circuit structural representation of Fig. 4 for providing among the present invention.
The data packet scheduling transmitting device structure of Fig. 5 for providing in according to the present invention, the result who adopts OPNET network simulation instrument modeling and simulating to obtain.This figure is postponed by the different priorities packet access channel that the simulation model operation result samples.This sampled result elapsed time average treatment.
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.
The invention discloses method and hardware component that a kind of IEEE of realization 802.11e or IEEE 802.11n WLAN (wireless local area network) data packet dispatching send, parts comprise a data packet scheduler, a hardware backoff circuit, a transmission buffer descriptor TxBD.Wherein:
Described packet scheduler is realized by drive software, stipulate according to the IEEE802.11e agreement, according to the priority difference of priority transmit queue, be that each priority query distributes different parameters, comprise that competition window maximum, contention window minimum and arbitration frame interbody spacer count AIFSN.Packet scheduler is according to above-mentioned parameter, be respectively each priority query and calculate pseudorandom integer and AIFSN's and value, and the respective queue of definite and value minimum is as being chosen formation by packet scheduler, get this formation head of the queue packet as packet to be sent, deliver to hardware and send buffering area TxBuff.
Described hardware backoff circuit is arranged in hardware component, is used for the pseudorandom integer that calculates according to packet scheduler and AIFSN's and value, calculates back off time, and carries out backoff procedure according to back off time.Hardware backoff circuit external interface signal comprises:
Channel idle indication Channel idle signal, whether input signal is used to indicate current channel condition idle;
With value Sum signal, input signal, be used to indicate the described transmission buffer descriptor of claim 2 TxBD's and value (Sum) field value;
Time slot counting Tslot signal, input signal is used to indicate the timeslot number of current accumulative total;
Keep out of the way request Backoff_Req signal, input signal is used to indicate whether to start back-off function;
Keep out of the way and finish the Backoff_Done signal, whether output signal is used for indicating to keep out of the way finishing.
Described transmission buffer descriptor TxBD, write down chosen the priority of formation, the pseudorandom integer value related and AIFSN by packet scheduler with this formation with value, packet memory address to be sent.Sending buffer descriptor TxBD field comprises:
With value Sum field, be used to write down the pseudorandom integer that calculates by packet scheduler and arbitration frame interbody spacer and count AIFSN's and value;
Priority P riority field is used to write down the priority of the formation of being selected by packet scheduler to be sent;
Frame address FrameAddress field is used to write down the memory address by the packet to be sent of packet scheduler selection;
Number of retransmissions Retry Count field is used for record by the detected frame number of retransmissions of hardware transtation mission circuit.
Fig. 2 utilizes the realization data packet dispatching of said structure setting and soft, the hardware component structural representation of sending function for the present invention.
As shown in Figure 2, from upper layer application arrive or by the packet that drive software produces have by upper layer application given or by IEEE 802.11e agreement specified priority level parameter.Priority parameters has AC VO (voice), AC VI (video), AC BE (doing one's best), four values of AC BK (background), and priority reduces successively.
Packet is sent into corresponding priorities transmit queue separately according to affiliated priority.When at least one priority transmit queue is not sky, carry out packet scheduler provided by the invention.Fig. 3 has shown by packet scheduler and selects formation to be sent and packet to be sent and realize sending function that concrete steps are as follows:
(1) after drive software receives packet, according to the DSCP value of IP bag or the MMPDU priority of IEEE802.11e agreement regulation, packet is put into the respective priority transmit queue, the priority transmit queue is generated and is safeguarded by drive software;
(2) drive software is judged current event or interrupt type.If the upper layer data bag arrives, or hardware sends end, stipulate according to the IEEE802.11e agreement, priority difference according to the priority transmit queue, for each priority query distributes different parameters, comprising that competition window maximum, contention window minimum and arbitration frame interbody spacer count AIFSN, is that all do not calculate pseudorandom integer Rand1, Rand2, Rand3, Rand4 for empty priority transmit queue then.The pseudorandom integer is evenly distributing in the competition window of each priority correspondence from 0.The maximum and the minimum value scope of the corresponding competition window of priority have nothing in common with each other.For priority VO, the maximum of competition window scope and minimum value are that (aCWmin+1)/2-1 is to (aCWmin+1)/4-1; For priority VI, the maximum of competition window scope and minimum value are that aCWmin arrives (aCWmin+1)/2-1; For priority BE, BK, the maximum of competition window scope is identical with minimum value, for aCWmax arrives aCWmin.ACWmax and aCWmin are the physical layer parameter of IEEE 802.11 agreements regulation, are used to characterize the maximum and the minimum value of competition window, and for example, for IEEE 802.11a/n, the two is respectively 15 and 1023.Pseudorandom integer calculations result and AIFSN addition are obtained and be worth sum, will write in the Sum territory that sends buffer descriptor TxBD with value sum;
What (3) packet scheduler of drive software maintenance judged whether a plurality of priority queries correspondence is identical value with value sum.If show intramural conflict take place this moment that according to IEEE 802.11e agreement regulation, behind the generation intramural conflict, conflict priority query competition window changes step (2) then according to formula (1) exponential increase; Otherwise change step (4);
(4) the priority transmit queue that packet scheduler is selected and value is minimum of drive software maintenance is as formation to be sent, the head of the queue packet of this formation is as packet to be sent, and packet memory address to be sent write send buffer descriptor TxBD frame address (FrameAddress) field, move hardware by bus Master equipment and send buffering area TxBuff;
(5) the hardware backoff circuit is calculated back off time according to formula (2), and is carried out backoff procedure with this time value according to the pseudorandom integer and AIFSN and the value Sum that send among the buffer descriptor TxBD.Hardware backoff circuit structural representation is seen Fig. 4.When packet scheduler has been selected transmit queue, then will keep out of the way request (Backoff_Req) signal and be changed to effectively.Keeping out of the way request signal effectively and time slot counting when equaling back off time, judging that channel idle indicates (Channel_idle) signal whether effective.If effectively, then explanation is kept out of the way to finish this moment, can send packet, will keep out of the way to finish output signal Backoff_Done and be changed to effectively;
(6) detect the channel busy-idle condition.If channel busy is then hung up current backoff procedure; Otherwise change step (7);
(7) the back off time value is successively decreased in time, when back off time is decremented to zero, hardware is sent packet among the buffering area TxBuff add the MAC head and send;
(8) detect re-transmission if send hardware unit, then send hardware unit current retransmission count aggregate-value write-back TxBD retransmission count (Retry Count) field.If the retransmission count value is not 0, then drive software upgrades competition window according to formula (1); Otherwise change step (9);
(9) repeat said process, the packet in the priority transmit queue sends to finish or reach send opportunity TXOP maximum time and limits.
The present invention has the following advantages:
(1) hardware that relates in this method sends buffering area TxBuff and has only 1, and it is little to take memory space, and hardware cost increases few; Calculate simply in the method, complexity is low, can realize recombination function under less cost and complexity;
(2) use packet scheduler provided by the invention, can correctly realize the delay differentiation that different priorities is used.
The data packet scheduling transmitting device structure that provides in according to the present invention, the packet access channel that adopts the OPNET modeling and simulating to obtain postpones simulation result as shown in Figure 5.Fig. 5 is the simulation result sampled value of elapsed time average treatment.It is 0.0176 second that the access channel of VO priority application postpones, and it is 0.0286 second that the access channel of VI priority application postpones,, it is 0.0592 second that the access channel of BE priority application postpones, it is 0.0640 second that the access channel of BK priority application postpones.Therefore, Fig. 5 shows, the data packet scheduling transmitting device structure that provides among the present invention can realize that IEEE 802.11e agreement specified priority level postpones to distinguish function.
More than disclosed only be several specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those skilled in the art can think variation all should drop in protection scope of the present invention.
Claims (5)
1. a data packet scheduling transmitting device that is used for WLAN (wireless local area network) is characterized in that, comprises a data packet scheduler, a hardware backoff circuit, a transmission buffer descriptor TxBD, wherein:
Described packet scheduler is realized by drive software, stipulate according to the IEEE802.lle agreement, priority difference according to the priority transmit queue, for each priority query distributes different parameters, comprise the competition window maximum, contention window minimum and arbitration frame interbody spacer are counted AIFSN, packet scheduler is according to above-mentioned parameter, being respectively each priority query calculates pseudorandom integer and arbitration frame interbody spacer and counts AIFSN's and value, and the respective queue of definite and value minimum is as being chosen formation by packet scheduler, get this formation head of the queue packet as packet to be sent, deliver to hardware and send buffering area TxBuff;
Described hardware backoff circuit, be arranged in hardware component, be used for the pseudorandom integer that calculates according to packet scheduler and arbitration frame interbody spacer and count AIFSN's and value, BackoffTime=Sum * aSlotTime calculates back off time according to formula, and carries out backoff procedure according to back off time; Wherein Sum is that the pseudorandom integer that calculates of packet scheduler and arbitration frame interbody spacer are counted AIFSN's and value, and aSlotTime is every slot time length that agreement is stipulated, BackoffTime is a back off time;
Described transmission buffer descriptor TxBD, write down chosen by packet scheduler that the priority of formation, the pseudorandom integer value related with this formation and arbitration frame interbody spacer count AIFSN with value, packet memory address to be sent.
2. a kind of data packet scheduling transmitting device that is used for WLAN (wireless local area network) as claimed in claim 1 is characterized in that, described transmission buffer descriptor TxBD field comprises:
With value Sum field, be used to write down the pseudorandom integer that calculates by packet scheduler and arbitration frame interbody spacer and count AIFSN's and value;
Priority P riority field is used to write down the priority of the formation of being selected by packet scheduler to be sent;
Frame address FrameAddress field is used to write down the memory address by the packet to be sent of packet scheduler selection;
Number of retransmissions Retry Count field is used for record by the detected frame number of retransmissions of hardware transtation mission circuit.
3. a kind of data packet scheduling transmitting device that is used for WLAN (wireless local area network) as claimed in claim 1, it is characterized in that, the back off time that described hardware backoff circuit is carried out backoff procedure institute foundation is obtained by multiplying each other with value Sum field and slot time of the described transmission buffer descriptor of claim 2 TxBD, and hardware backoff circuit external interface signal comprises:
Channel idle indication Channel_idle signal, whether input signal is used to indicate current channel condition idle;
With value Sum signal, input signal, be used to indicate the described transmission buffer descriptor of claim 2 TxBD with value Sum field value;
Time slot counting Tslot signal, input signal is used to indicate the timeslot number of current accumulative total;
Keep out of the way request Backoff_Req signal, input signal is used to indicate whether to start back-off function;
Keep out of the way and finish the Backoff_Done signal, whether output signal is used for indicating to keep out of the way finishing.
4. a kind of data packet scheduling transmitting device that is used for WLAN (wireless local area network) as claimed in claim 1, be used to dispatch packet from the upper layer application input, output is satisfied IEEE 802.11e agreement and is distinguished the packet that postpones requirement, it is characterized in that the realization of described packet scheduler may further comprise the steps:
(1) after drive software receives packet,, packet is put into the respective priority transmit queue according to the differentiated services code points DSCP value of IP bag or other packet priority of IEEE 802.11e agreement regulation;
(2) drive software is judged current event or interrupt type, if the upper layer data bag arrives, or hardware sends end, then be that all do not calculate the pseudorandom integer for empty priority transmit queue, and pseudorandom integer calculations result and arbitration frame interbody spacer are counted the AIFSN addition obtain and be worth, will write with value and send buffer descriptor TxBD and value Sum field;
What (3) judge whether a plurality of priority queries correspondence is identical value with value, if show intramural conflict takes place this moment, stipulate according to IEEE 802.11e agreement, after intramural conflict took place, the competition window of conflict priority query was pressed following formula (1) exponential increase, changeed then (2); Otherwise change (4);
CW(t)＝(CW(t-1)+1)×2-1 (1)
(4) the priority transmit queue that packet scheduler is selected and value is minimum is as formation to be sent, the head of the queue packet of this formation is as packet to be sent, and packet memory address to be sent write TxBD frame address Frame Address field, move hardware by bus Master equipment and send buffering area TxBuff;
(5) the hardware backoff circuit is counted AIFSN and value according to the pseudorandom integer and the arbitration frame interbody spacer that send among the buffer descriptor TxBD, calculates back off time according to formula (2), and carries out backoff procedure with this time value;
BackoffTime＝Sum×aSlotTime (2)
(6) detect the channel busy-idle condition, if channel busy is then hung up current backoff procedure; Otherwise change (7);
(7) the back off time value is successively decreased in time, when back off time is decremented to zero, hardware is sent packet among the buffering area TxBuff add the MAC head and send;
(8) detect re-transmission if send hardware unit, then send hardware unit current retransmission count aggregate-value write-back TxBD retransmission count Retry Count field; If the retransmission count value is not 0, then drive software upgrades competition window according to formula (1); Otherwise change (9);
(9) repeat said process, the packet in the priority transmit queue sends to finish or reach send opportunity TXOP maximum time and limits.
5. a kind of data packet scheduling transmitting device that is used for WLAN (wireless local area network) as claimed in claim 4 is characterized in that, step (2) further comprises:
(1) be that all are not empty priority transmit queue calculating pseudorandom integer, the pseudorandom integer is evenly distributing in the competition window of each priority correspondence from 0;
(2) maximum and the minimum value scope of the corresponding competition window of different priorities have nothing in common with each other, and for voice priority VO, the maximum of competition window scope and minimum value are that (aCWmin+1)/2-1 is to (aCWmin+1)/4-1; For video priority VI, the maximum of competition window scope and minimum value scope are that aCWmin is to aCWmin+1)/2-1; For the priority BE that does one's best, background priority BK, the maximum of competition window scope is identical with minimum value, for aCWmax arrives aCWmin; ACWmax and aCWmin are the physical layer parameter of IEEE 802.11e regulation.
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| CN102685468B (en) * | 2012-04-28 | 2014-10-08 | 华为技术有限公司 | Method and device for transmitting video packets |
| CN108012338A (en) * | 2016-11-02 | 2018-05-08 | 中兴通讯股份有限公司 | Data transmission method, device, application and base station |
| CN107948085B (en) * | 2017-12-28 | 2021-02-02 | 中国电子科技集团公司第二十研究所 | Message sending control method based on service and satellite channel characteristics |
| CN112261734A (en) * | 2018-03-22 | 2021-01-22 | Oppo广东移动通信有限公司 | Method and terminal device for random access |
| CN110166378B (en) * | 2019-04-04 | 2023-06-16 | 珠海欧力配网自动化股份有限公司 | Communication system and method for debugging and maintaining distribution network terminal |
| CN110727615B (en) * | 2019-10-11 | 2020-12-25 | 福建天晴数码有限公司 | Method and system for realizing acceleration of interface data request |
| CN111093000B (en) * | 2019-11-28 | 2020-12-29 | 中国电子科技集团公司第三十研究所 | Method for guaranteeing voice priority real-time sending based on G.SHDSL |
| CN113727316B (en) * | 2021-07-15 | 2024-07-09 | 广州芯之联科技有限公司 | Wi-Fi and Bluetooth coexisting radio frequency scheduling method and device |
| CN115862352B (en) * | 2022-11-24 | 2024-02-27 | 浙江欧菲克斯交通科技有限公司 | Calculation method, system, medium and equipment for solving parallel code sending conflict by random number |
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