CN1929436B - Method and device for solving occupation problem of WLAN reception buffer zone - Google Patents
Method and device for solving occupation problem of WLAN reception buffer zone Download PDFInfo
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- CN1929436B CN1929436B CN2005100984478A CN200510098447A CN1929436B CN 1929436 B CN1929436 B CN 1929436B CN 2005100984478 A CN2005100984478 A CN 2005100984478A CN 200510098447 A CN200510098447 A CN 200510098447A CN 1929436 B CN1929436 B CN 1929436B
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Abstract
This invention provides one method and device to solve WLAN MSDU/MMDU buffer area for invalid data, which processes space discharge when necessary for first longest data and has adaptive communicating self-adapting characteristics to improve communication efficiency. This hardware parts comprise one receive buffer RxBuff, one RxBuff slice data register, one head register, one current record register, one valid record register and one discharge register.
Description
Technical field
The present invention relates to network communication field, relate in particular to and receive method and the hardware component that buffering area is disabled data occupancy among a kind of WLAN of solution.
Background technology
In WLAN (wireless local area network), because the network environment complexity, in order to improve reliability, a plurality of segmentations that MSDU or MMDU need be decomposed into smaller length send, and these rules are called segmentation; Each MSDU/MMPDU can be divided into 16 segmentations at most.Each segmentation is made of frame head and two parts of frame, and frame head duplicates from MSDU/MMPDU, but need fragment sequence number field and many segmentations field wherein be provided with.The fragment sequence number field of first segmentation is 0, and later segmentation increases progressively by 1 successively.Except many segmentations field of last segmentation is set to 0, many segmentations of other all segmentations field is set to 1.
For the recipient, a plurality of segmentations need be constituted single MSDU or MMDU, these rules are called reorganization.
When a STA sends in the process of certain MSDU segmentation, may occur interrupting, and that compete channel subsequently and send the MSDU/MMPDU frame may be another STA, this just causes reciever possibly can't receive the complete segmentation of MSDU/MMPDU in a period of time, and the segmentation that has received so just need be stored in and receive in the buffering area.And because the randomness of channel competition, when the meeting of segmentation subsequently of unpredictable certain MSDU/MMDU of recipient sends, also just can't estimate when can receive complete.
Based on as above analyzing as can be known, in a period of time, recipient's one side can maintain the segmentation of a plurality of imperfect MSDU/MMPDU of getting, if the subsequent segment of certain MSDU/MMPDU can not arrive always, its segmentation that has received will take reception memory capacity always so.Finally cause the MSDU/MMPDU of follow-up arrival to receive, even this MSDU/MMPDU does not carry out segmentation.This problem receives buffering area ineffective occupation problem exactly.
This problem not only appears at not finish and receives in the segmentation.Another kind of situation is that complete if certain MSDU/MMPDU has received, still for some reason, not having can be processed, forms a doomed dead certificate, also can cause receive taking of buffering area always.
See also Fig. 1, the figure illustrates one owing to receive the imperfect reception buffer area ineffective occupation situation that causes of segmentation.
(1) MSDU/MMPDU receives the segmentation that buffer area has kept several MSDU/MMPDU, causes remaining free space seldom.
(2) in a period of time,, receive buffer area so and taken always because that the MSDU/MMPDU that keeps can't receive is complete.
(3) during this period, the MSDU/MMPDU of any arrival can't have enough spaces to be received, even it does not have segmentation.
(4) if there is not suitable method, unless that the MSDU/MMPDU of certain storage is received is complete, otherwise the memory block can be taken always, causes communication disruption.
For avoiding this problem, WLAN MAC agreement provides a kind of MSDU/MMPDU of use the method that the longest time of reception is evaded.Method definition: purpose SAT should be each just received MSDU/MMPDU and safeguards a reception timer, and this timer has an attribute aMaxReceiveLifeTime, has defined to receive a maximum duration that MSDU/MMPDU allowed.Receive timer and begin counting when first segmentation of MSDU/MMPDU arrives, if exceed the longest time of reception, then purpose STA will abandon this MSDU/MMPDU segmentation that all have received.Agreement defines simultaneously, and realization should can guarantee simultaneously at least that the segmentation of three MSDU/MMPDU receives, so must safeguard three reception timers at least simultaneously.The threshold values aMaxReceiveLifeTime of long time of reception is defined and is adjusted by the implementor.
According to directly perceived a realization of this method, be exactly to safeguard a timer for each MSDU/MMPDU.On hardware is realized, just must be according to the MSDU/MMPDU that may deposit at most, the timer of pre-defined respective numbers.And be each MSDU/MMPDU definition record register of the time of advent.Because MSDU/MMPDU frame, its minimum length and maximum length difference can reach more than 10 times, this means if according to protocol definition, keep the reception buffering area of at least three frame data, the small data frame that may deposit so needs the timer of pre-defined a myriad of at 3 * 10=30 frame.
As the above analysis, this method has following shortcoming:
(1) needs pre-defined a large amount of timers, cost height.
(2) under most of situation, timer all is in idle condition, and implementation efficiency is low.
(3) more timer itself consumes higher power consumption.
An improvement to this method is for each a MSDU/MMPDU distribution register time of advent, to define a shared timer simultaneously.When arriving for the first time, fills in MSDU/MMPDU its corresponding register time of advent.Shared timer just triggers once the poll to all MSDU/MMPDU at set intervals, this poll according to the current time and the time of advent register ground difference, judge whether to arrive the longest time of reception,, so just discharge this MSDU/MMPDU and take up room if arrive.
See also Fig. 2, this figure has illustrated this structure.
This method has had very big improvement, but regularly carries out polling mechanism owing to having used, so following shortcoming is arranged:
(1) because regularly granularity can not be too big,, causes unnecessary processing consumption so wrap count is higher.
(2) buffer management can not cause no matter receiving buffering area and take what state according to the signal intelligence self adaptation, all uses same strategy.If few such as taking in the present buffering area, the segmentation that can allow not receive complete MSDU/MMPDU keeps a period of time more, helps improving communication performance like this.
(3) timer is realized association and system clock frequency, relative complex.Simultaneously, need 8 bytes at least, relatively waste hardware resource because represent a time.
Summary of the invention
The invention provides a kind of the solution because the method and the hardware component of the reception buffer area ineffective occupation problem that the imperfect or doomed dead certificate of reception segmentation causes, the present invention can be on the basis of dealing with problems, have adaptive ability simultaneously, and can keep less processing frequency.
The invention discloses a kind of hardware component, can be good at solving owing to receive the reception buffer area ineffective occupation problem that the imperfect or doomed dead certificate of segmentation causes.These parts comprise: one receives buffer area RxBuff; A RxBuff fragment data supervisor register; One stature record register; A current record register; One is effectively write down register the earliest; A burst discharges configuration register.
Wherein, described reception buffer area is that unit is divided into the N sheet by the M byte, is used for the data of store M SDU/MMPDU.
Described RxBuff fragment data supervisor register is divided into and is K bar management accounts, an every unique MSDU/MMPDU, positional information of also having preserved first fragment data He last fragment data of this MSDU/MMPDU of having indicated of record.By management accounts, can uniquely determine a MSDU/MMPDU, also can the deposit position of this MSDU/MMPDU of unique location in RxBuff.
Management accounts in the described management by district register comprises following field:
(1) MACC address field: write down the source MAC that comes that receives data;
(2) MSDU/MMPDU sequence number field: the unique serial number that has write down MSDU/MMPDU;
(3) fragment sequence number field: write down the unique serial number of one of them segmentation among the MSDU/MMPDU;
(4) frame accepting state field: indicated this MSDU/MMPDU accepting state, state comprises and finishing receiving, receive do not finish with data invalid.It is invalid to be initialized as.
(5) first burst index field: write down the position of first burst of this MSDU/MMPDU in RxBuff.
(6) tail burst index field: write down the position of last burst of this MSDU/MMPDU in RxBuff.
(7) burst amounts to field: write down MSDU/MMPDU and taken what bursts altogether.
Described record register points to the up-to-date effective record in the described fragment data supervisor register.
Described current record register points to the current efficient in operation record in the described fragment data supervisor register.
The described register that effectively writes down the earliest points in the record in the described fragment data supervisor register, sets up effective record the earliest.
So-called effectively record is meant that this writes down determined MSDU/MMPDU and its segmentation also is present in the reception buffer area, has also promptly taken buffer area.
Described burst discharges configuration register, is used to be provided with a numerical value, this numeric representation carry out the RxBuff space when discharging at needs, need what bursts of minimum release.
The present invention also discloses a kind of method that WLAN reception MSDU/MMDU buffering area is disabled data occupancy that is used for solving simultaneously, be used between above-mentioned each building block, setting up contact, solve because the imperfect or doomed dead certificate of reception segmentation causes receiving the occupation problem of buffer area, thereby improve communication efficiency.It may further comprise the steps:
When the data of (1) MSDU/MMPDU arrived, these data can be any segmentations of this MSDU/MMPDU, after hardware receives M byte, form a burst, judge whether this burst is first burst of certain segmentation,, change so (5) if not first burst.If first burst changes (2);
(2) fragment data inside include the frame head information of this MSDU/MMPDU, and identification information in the hardware extraction frame head, and the management accounts in comparison identification information and the RxBuff management by district register judge whether these data are legal.If illegal, change (3); Otherwise, judge that whether this information shows is a new MSDU/MMPDU, if change (4) so, if not, change (5).
(3) abandon this illegal segment data.
(4) in RxBuff management by district register, increase a record, upgrade current record register and owner record register, change then (5);
(5) check that the RxBuff burst takies situation,, change (6), otherwise change (7) if idle burst is lower than threshold values;
(6) from effectively writing down the recording start that register points to the earliest, the RxBuff burst space that takies of the MSDU/MMPDU that RR release record identified one by one reaches burst up to the burst number that discharges and discharges numerical value in the configuration register.Change then (7).
(7) this fragment data is put in the RxBuff burst, changeed (8).
(8) repeat said process, show that in the MSDU/MMPDU flag information reception is complete, change (9).
(9) receive the buffer memory parts and point out the MSDU/MMPDU reception complete, data are extracted on the request upper strata; If these data are extracted, discharge the RxBuff burst space that it takies so; Just in time point to this record if effectively write down register the earliest, from this recording start, search one by one so,, point to the record that this finds effectively writing down register the earliest up to finding an effective record.
Step (4) further specifies:
(1) record that the owner record register is pointed to moves down one, and upgrades the owner record register and point to this record.If the frame accepting state field identification of this record is an effective status, discharge the shared RxBuff burst of MSDU/MMPDU that this record points to so, change then (2).Otherwise change (2).
(2) preserve and deposit identification information and the burst positional information of extracting in this record.Change (3).
(3) upgrade the current record register, point to this record.
Step (6) further specifies:
(1) discharges and effectively to write down the burst that the MSDU/MMPDU that record identified that register points to takies the earliest.Judge that whether discharge burst equals to discharge the interior numerical value of configuration register, if equal, changes (3), otherwise changes (2).
(2) move down a record from the record that effectively writes down the register sensing the earliest, judge the frame accepting state field of this record,, continue so to move down,, change (1) up to arriving an effective record if this field contents is invalid; Otherwise change (3).
(3) move down record up to arriving an effective record, will effectively write down register the earliest and point to this record.
By foregoing description as can be known, the present invention only just carries out the release of RxBuff when free memory is less than threshold values.Simultaneously, effectively but register always points to and arrives the earliest the MSDU/MMPDU that never finishes the earliest, but or finish not by the upper strata extract doomed dead certificate.By the method that the present invention describes, just carry out the space when just can realize only being necessary and discharge, and always be released in the longest data of life period in the buffer memory earlier.Simultaneously, if arrive threshold values and do not get under the situation receiving buffering area, under the situation of just communicating by letter lentamente, allow not finish MSDU/MMPDU and wait for that the long time is to improve receiving efficiency; Under the busy situation of communicating by letter, then can discharge the data of not finishing of stand-by period length as early as possible, improve communication efficiency.
The present invention has the following advantages:
Just carry out space release when (1) the present invention only is necessary, and do not need the poll that carries out regularly.
(2) but the present invention always is released in the longest data of life period in the buffer memory earlier, and these data comprise uncompleted MSDU/MMPDU, also comprises finishing untreated doomed dead certificate.Thereby solve the invalid data occupation problem fully.
(3) the present invention allows not finish MSDU/MMPDU and waits for that the long time is to improve receiving efficiency under the situation of communicating by letter lentamente; Under the busy situation of communicating by letter, what then can discharge stand-by period length as early as possible does not finish data to improve communication efficiency, has adaptivity.
(4) the present invention does not use timer and time memory register, has reduced complexity and the cost realized.
Description of drawings
Fig. 1 is an invalid data occupation problem schematic diagram;
Fig. 2 solves the structural representation of the hardware unit of invalid data occupation problem for using shared timer;
Fig. 3 is the structural representation of the hardware unit of realization the method for the invention;
Fig. 4 is based on the process chart of the solution reception buffer area occupation problem of Fig. 3 hardware unit.
Embodiment
The structure of being set forth in the concrete enforcement fundamental sum of the present invention specification of the present invention is consistent with principle.Below in conjunction with accompanying drawing, specify the present invention.
The invention discloses a kind of hardware component, can be good at solving owing to receive the reception buffer area ineffective occupation problem that the imperfect or doomed dead certificate of segmentation causes.These parts comprise: one receives buffer area RxBuff; A RxBuff fragment data supervisor register; One stature record register; A current record register; One is effectively write down register the earliest; A burst discharges configuration register.
See also Fig. 3, the hardware component structural representation that it utilizes said structure to realize for the present invention.According to this schematic diagram, this hardware component is made of above-mentioned 4 parts.
Wherein, described reception buffer area is that unit is divided into the N sheet by the M byte, is used for the data of store M SDU/MMPDU.
Described RxBuff fragment data supervisor register is divided into and is K bar management accounts, an every unique MSDU/MMPDU, positional information of also having preserved first fragment data He last fragment data of this MSDU/MMPDU of having indicated of record.By management accounts, can uniquely determine a MSDU/MMPDU, also can the deposit position of this MSDU/MMPDU of unique location in RxBuff.
Management accounts in the described management by district register comprises following field:
(1) MACC address field: write down the source MAC that comes that receives data;
(2) MSDU/MMPDU sequence number field: the unique serial number that has write down MSDU/MMPDU;
(3) fragment sequence number field: write down the unique serial number of one of them segmentation among the MSDU/MMPDU;
(4) frame accepting state field: indicated this MSDU/MMPDU accepting state, state comprises and finishing receiving, receive do not finish with data invalid.It is invalid to be initialized as.
(5) first burst index field: write down the position of first burst of this MSDU/MMPDU in RxBuff.
(6) tail burst index field: write down the position of last burst of this MSDU/MMPDU in RxBuff.
(7) burst amounts to field: write down MSDU/MMPDU and taken what bursts altogether.
Described record register points to the up-to-date effective record in the described fragment data supervisor register.
Described current record register points to the current efficient in operation record in the described fragment data supervisor register.
The described register that effectively writes down the earliest points in the record in the described fragment data supervisor register, sets up effective record the earliest.
So-called effectively record is meant that this writes down determined MSDU/MMPDU and its segmentation also is present in the reception buffer area, has also promptly taken buffer area.
Described burst discharges configuration register, is used to be provided with a numerical value, this numeric representation carry out the RxBuff space when discharging at needs, need what bursts of minimum release.
See also Fig. 4, this Figure illustrates the hardware component that uses above-mentioned explanation, solve the flow process that receives buffering area invalid data occupation problem, concrete steps are as follows,
When the data of (1) MSDU/MMPDU arrived, these data can be any segmentations of this MSDU/MMPDU, after hardware receives M byte, form a burst, judge whether this burst is first burst of certain segmentation,, change so (5) if not first burst.If first burst changes (2);
(2) first fragment data inside includes the frame head information of this MSDU/MMPDU, and identification information in the hardware extraction frame head, and the management accounts in comparison identification information and the RxBuff management by district register judge whether these data are legal.If illegal, change (3); Otherwise, judge that whether this information shows is a new MSDU/MMPDU, if change (4) so, if not, change (5).
(3) abandon this illegal segment data.
(4) in RxBuff management by district register, increase a record, upgrade current record register and owner record register, change then (5);
(5) check that the RxBuff burst takies situation,, change (6), otherwise change (7) if idle burst is lower than threshold values;
(6) from effectively writing down the recording start that register points to the earliest, the RxBuff burst space that takies of the MSDU/MMPDU that RR release record identified one by one reaches burst up to the burst number that discharges and discharges numerical value in the configuration register.Change then (7).
(7) this fragment data is put in the RxBuff burst, changes (8).
(8) repeat said process, show that in the MSDU/MMPDU flag information reception is complete, data are extracted on the request upper strata; Change (9).
(9), discharge the RxBuff burst space that it takies so if these data are extracted; Just in time point to this record if effectively write down register the earliest, change so (10).
(10) from this recording start, search one by one,, point to the record that this finds effectively writing down register the earliest up to finding an effective record.
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. one kind solves among the WLAN and to receive the device that the MSDU/MMPDU buffering area is disabled data occupancy, and it is characterized in that hardware component comprises: one receives buffer area RxBuff; A RxBuff fragment data supervisor register; One stature record register; A current record register; One is effectively write down register the earliest; A burst discharges configuration register; Wherein:
Described reception buffer area RxBuff is that unit is divided into the N sheet by the M byte, is used for the data of store M SDU/MMPDU;
Described RxBuff fragment data supervisor register is divided into and is K bar management accounts, an every unique MSDU/MMPDU, positional information of also having preserved first fragment data He last fragment data of this MSDU/MMPDU of having indicated of record;
Described record register points to the up-to-date effective record in the described RxBuff fragment data supervisor register;
Described current record register points to the current efficient in operation record in the described RxBuff fragment data supervisor register;
The described register that effectively writes down the earliest points in the record in the described RxBuff fragment data supervisor register, sets up effective record the earliest;
Described burst discharges configuration register, is used to be provided with a numerical value, this numeric representation when needs receive buffer area RxBuff space and discharge, need what bursts of minimum release.
2. receive the device that the MSDU/MMPDU buffering area is disabled data occupancy among a kind of WLAN of solution as claimed in claim 1, it is characterized in that the management accounts in the described RxBuff fragment data supervisor register comprises: the MAC Address field; The MSDU/MMPDU sequence number field; The fragment sequence number field; Frame accepting state field; First burst index field; Tail burst index field; Burst amounts to field.
3. receive the device that the MSDU/MMPDU buffering area is disabled data occupancy among a kind of WLAN of solution according to claim 1, it is characterized in that may further comprise the steps:
(1) when the data of a MSDU/MMPDU arrived, these data can be any segmentations of this MSDU/MMPDU, after device receives M byte, form a burst, judge whether this burst is first burst of certain segmentation,, change so (5) if not first burst; If first burst changes (2);
(2) first fragment data inside includes the frame head information of this MSDU/MMPDU, and device extracts identification information in the frame head, and the management accounts in comparison identification information and the RxBuff fragment data supervisor register, judges whether these data are legal; If illegal, change (3); Otherwise, judge that whether this information shows is a new MSDU/MMPDU, if change (4) so, if not, change (5);
(3) abandon this illegal segment data;
(4) in RxBuff fragment data supervisor register, increase a record, upgrade a current record register and a record register, change then (5);
(5) check that the RxBuff burst takies situation,, change (6), otherwise change (7) if idle burst is lower than threshold values;
(6) from effectively writing down the recording start that register points to the earliest, the RxBuff burst space that takies of the MSDU/MMPDU that RR release record identified one by one reaches burst up to the burst number that discharges and discharges numerical value in the configuration register, changes then (7);
(7) this fragment data is put in the RxBuff burst of a free time, changeed (8);
(8) repeat (1)-(7) process, show that in the MSDU/MMPDU flag information reception is complete, change (9);
(9) receive the buffer memory parts and point out the MSDU/MMPDU reception complete, data are extracted on the request upper strata; If these data are extracted, discharge the RxBuff burst space that it takies so; Just in time point to this record if effectively write down register the earliest, from this recording start, search one by one so,, point to the record that this finds effectively writing down register the earliest up to finding an effective record.
4. receive the device that the MSDU/MMPDU buffering area is disabled data occupancy among a kind of WLAN of solution as claimed in claim 3, it is characterized in that step (4) further comprises:
(1) head is write down the record that register points to and move down one, and upgrade the owner record register and point to this record; If the frame accepting state field identification of this record is an effective status, discharge the shared RxBuff burst of MSDU/MMPDU that this record points to so, change then (2); Otherwise change (2);
(2) in this record, deposit identification information and the burst positional information of extracting, change (3);
(3) upgrade the current record register, point to this record.
5. receive the device that the MSDU/MMPDU buffering area is disabled data occupancy among a kind of WLAN of solution as claimed in claim 3, the described step (6) that it is characterized in that further comprises:
(1) discharges and effectively to write down the burst that the MSDU/MMPDU that record identified that register points to takies the earliest; Judge that whether discharge burst equals to discharge the interior numerical value of configuration register, if equal, changes (3), otherwise changes (2);
(2) move down a record from the record that effectively writes down the register sensing the earliest, judge the frame accepting state field of this record,, continue so to move down,, change (1) up to arriving an effective record if this field contents is invalid; Otherwise change (3);
(3) move down record up to arriving an effective record, will effectively write down register the earliest and point to this record.
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| CN101094183B (en) * | 2007-07-25 | 2011-12-07 | 杭州华三通信技术有限公司 | Buffer memory management method and device |
| CN108616327B (en) * | 2016-12-12 | 2021-03-26 | 中国航空工业集团公司西安航空计算技术研究所 | FC-ASM protocol-based concurrent fragment message receiving method and circuit |
| CN110417514B (en) * | 2019-07-22 | 2022-02-01 | 北京地平线机器人技术研发有限公司 | Data sending method and device and data receiving method and device |
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| CN1536841A (en) * | 2003-04-08 | 2004-10-13 | 顶尖电子商务（武汉）有限公司 | WLAN access device for poviding wideband several services for fixed user |
| CN1543731A (en) * | 2001-07-09 | 2004-11-03 | �ʼҷ����ֵ�������˾ | System and method for sharing bandwidth between co-located 802.11A/E and Hiperlan/2 systems |
| CN1649338A (en) * | 2005-03-11 | 2005-08-03 | 威盛电子股份有限公司 | Method and device for receiving data pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1543731A (en) * | 2001-07-09 | 2004-11-03 | �ʼҷ����ֵ�������˾ | System and method for sharing bandwidth between co-located 802.11A/E and Hiperlan/2 systems |
| CN1536841A (en) * | 2003-04-08 | 2004-10-13 | 顶尖电子商务（武汉）有限公司 | WLAN access device for poviding wideband several services for fixed user |
| CN1649338A (en) * | 2005-03-11 | 2005-08-03 | 威盛电子股份有限公司 | Method and device for receiving data pack |
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Address after: 102209 Beijing, Beiqijia, the future of science and technology in the south area of China electronic network security and information technology industry base C building, Patentee after: Beijing CEC Huada Electronic Design Co., Ltd. Address before: 100102 Beijing City, Chaoyang District Lize two Road No. 2, Wangjing science and Technology Park A block five layer Patentee before: Beijing CEC Huada Electronic Design Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 Termination date: 20200908 |