CN101123580A - Packet transmission method and base station device - Google Patents
Packet transmission method and base station device Download PDFInfo
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- CN101123580A CN101123580A CNA2007100769517A CN200710076951A CN101123580A CN 101123580 A CN101123580 A CN 101123580A CN A2007100769517 A CNA2007100769517 A CN A2007100769517A CN 200710076951 A CN200710076951 A CN 200710076951A CN 101123580 A CN101123580 A CN 101123580A
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Abstract
The invention relates to the communication field, which discloses a packet transmission method and a base station equipment and improves a bandwidth utilization efficiency of an Abis and an air interface. In the invention, if a current packet received by the base station is not an anticipant packet at present, the current packet received by a caching base station is transmitted to a buffer; and if the present anticipant packet exists in the buffer, the present anticipant packet is transmitted. The present anticipant packet is a next packet, which follows a recently transmitted packet.
Description
Technical field
The present invention relates to the communications field, particularly the bag transmission technology.
Background technology
At the data-optimized evolution system of CDMA 2000 (Code Division Multiple Access 2000Evolution Data Optimized, be called for short " CDMA2000 EV-DO ") in, because base station controller (Base Station Controller, be called for short " BSC ") with the diversity of interface (Abis) the link networking of base station, might there be out of order situation in the packet of being sent out in the system.
In the prior art, any processing is not carried out to the out of order bag of receiving in the base station, after receiving a bag from BSC, directly this bag is transmitted to terminal, as shown in Figure 1 at every turn.
By carry out radio link protocol (Radio Link Protocol is called for short " RLP ") in terminal, out of order bag is handled, wherein, RLP is the safeguard agreement to eating dishes without rice or wine to transmit of CDMA2000 EV-DO agreement regulation.It realizes that principle is as follows: terminal detects the sequence number of the bag that receives from the base station, when finding that the cavity produces, by negative response (Negative Acknowlegment, be called for short " Nak ") the first byte sequence number and the empty length in cavity is reported to BSC, retransmit this one piece of data to the base station by BSC.Illustrating, is one section bag sequence number that the BTS channel board receives in real network below:
1)CECM0:2007:04:17:15:58:09:405--currentFrameId[1]1569,CurFrmID:1567
2)CECM0:2007:04:17:15:58:09:406--currentFrameId[1]1568,CurFrmID:1569
3)CECM0:2007:04:17:15:58:09:406--currentFrameId[1]1571,CurFrmID:1568
4)CECM0:2007:04:17:15:58:09:408--currentFrameId[1]1570,CurFrmID:1571
For above-mentioned out of order bag, the base station is transmitted to terminal at every turn after receiving bag, handled by terminal.THP terminal handler process is as follows:
1) terminal receives that from the base station sequence number is 1569 bag, finds to lack sequence number and be 1568 bag, reports Nak message to BSC, and requiring retransmission sequence number is 1568 bag;
2) receive from the base station that immediately sequence number is 1568 bag, the cavity is filled; Because in the 1st step, terminal to report Nak message, requiring retransmission sequence number is 1568 bag, therefore, BSC can be 1568 bag to the base station retransmission sequence number afterwards, and the base station can be transmitted to terminal with this bag once more, but, then retransmission packet is abandoned as repeating data because terminal has been received this bag;
3) after terminal receives that sequence number is 1569 bag, the expectation Receive sequence number is 1570 bag, is 1571 bag but terminal reality receives sequence number from the base station, produces the cavity again, and then terminal reports Nak message to BSC, and requiring retransmission sequence number is 1570 bag;
4) to receive sequence number immediately be 1570 bag to terminal, and process is with the 2nd step.
The present inventor finds that in said process, terminal has reported 2 Nak message request to retransmit altogether, but has received the bag of out of order arrival at once again, and the retransmission packet that is caused by this Nak message then is taken as repeating data and abandons subsequently.In above-mentioned example, from sequence number 1567 to 1571, send 5 RLP bags altogether, wherein 2 because out of order being required retransmits and abandons, if the out of order situation of transmission network remains unchanged always, then these unnecessary retransmission data occupancies 40% Abis and bandwidth of air-interface, caused great bandwidth waste.
Summary of the invention
The technical problem underlying that embodiment of the present invention will solve provides a kind of package transmission method and base station equipment, makes Abis and the bandwidth availability ratio of eating dishes without rice or wine be improved.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of package transmission method, may further comprise the steps:
The base station receives bag;
If the bag of the current expectation of Bao Buwei of the current reception in base station, the wrapping of the current reception in buffer memory base station to buffering area;
If there is the bag of current expectation in the buffering area, send the bag of current expectation.
Embodiments of the present invention also provide a kind of base station equipment, comprising:
Receiving element is used for receiving bag;
Buffer unit is used for the buffer memory bag;
Transmitting element is used for sending bag;
First judging unit is used to judge whether the bag of the current reception of receiving element is the bag of current expectation, if not, then indicate the bag of the current reception of buffer unit buffer memory receiving element;
Second judging unit is used for judging whether buffer unit exists the bag of current expectation, if exist, then indicates transmitting element to send the bag of current expectation.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:
If the bag of the current expectation of Bao Buwei of the current reception in base station, the wrapping of the current reception in buffer memory base station to buffering area; If there is the bag of current expectation in the buffering area, send the bag of current expectation, thereby solve because the re-transmission that the Abis link exists out of order bag to cause increases, the bandwidth waste problem, make Abis and the bandwidth availability ratio of eating dishes without rice or wine be improved.
Description of drawings
Fig. 1 is the flow chart of base station transmits bag in the prior art;
Fig. 2 is the package transmission method flow chart according to first embodiment of the invention;
Fig. 3 is the package transmission method flow chart according to second embodiment of the invention;
Fig. 4 is the base station equipment structure chart according to fifth embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
First execution mode of the present invention relates to a kind of package transmission method.In the present embodiment, ordering buffer area is set, such as this buffering area being arranged on the channel board of base station in the base station.After the base station received bag from Abis interface, if the bag of the current expectation of Bao Buwei of the current reception in base station, then the current reception in buffer memory base station wrapped to buffering area; If there is the bag of current expectation in the buffering area, send the bag of current expectation.Idiographic flow as shown in Figure 2.
In the step 210 of Fig. 2, the base station receives bag.
In the step 220 of Fig. 2, the base station judges whether the bag of current reception is the bag of current expectation.The bag that current expectation receives is meant: the consecutive next one of bag that sends with the last time wraps.If the bag of current expectation then enters step 230, the base station sends this bag, and will wrap the bag of consecutive next bag as current expectation with this; If not the bag of current expectation, then enter step 240, the base station with the bag buffer memory of current reception to buffering area.This buffering area can be arranged on the channel board of base station.
Need to prove that the bag that receive the base station in the present embodiment comprises that BSC is to the business packet of terminal transmission, the bag that terminal sends to BSC, the signaling packet that BSC or terminal send to the base station etc.For the bag that BSC sends to terminal, in step 230, the base station should be wrapped to terminal and be sent; For the bag that terminal sends to BSC, in step 230, the base station should be wrapped to BSC and be sent; For the signaling packet that BSC or terminal send to the base station, in step 230, the base station should be wrapped to the transmission of respective handling module, or sent to the last layer agreement; Deng.
After step 230, enter the step 250 of Fig. 2, judge the bag that whether has current expectation in the buffering area.If exist then return step 230, send this bag, and will wrap the consecutive next bag that wraps as current expectation with this.If do not have the bag of current expectation in the buffering area, then process ends.
As seen, carry out buffer memory by the bag that BSC is issued in the base station in the present embodiment and reorder, solved, make Abis and the bandwidth availability ratio of eating dishes without rice or wine be improved because the re-transmission that the Abis link exists out of order bag to cause increases, the bandwidth waste problem.
Second execution mode of the present invention relates to a kind of package transmission method equally, can adopt as shown in Figure 3 flow process as execution mode.Present embodiment can be provided with a status indicator when specific implementation, when not having packet loss, this status indicator is set to normal condition current, and when having packet loss, this status indicator is set to the state of reordering current.The initial condition of this status indicator is a normal condition.In addition, a variable V n is set, is used to preserve the bag that current expectation receives, the initial value of this Vn can be 0.Hypothesis BSC increases progressively to fixed step size than previous packet sequence number to the sequence number of a back packet of base station order transmission in the present embodiment, be the bag that receives of the current expectation in base station sequence number than the sequence number of the bag of the nearest transmission in base station little one to fixed step size, should be a limited natural number to fixed step size, as 1.
In the step 301 of Fig. 3, the base station receives bag from Abis interface.
Then, enter the step 302 of Fig. 3, write down the sequence number of the bag of current reception.
Then, enter the step 303 of Fig. 3, judge status indicator, if normal condition then enters step 304, if the state that reorders then enters step 307.
In the step 304 of Fig. 3, whether order is mutually continuous with last one sequence number that receives bag to judge the sequence number of bag of current reception.For example, suppose that a last bag sequence number of receiving is recorded as LstPktID, the sequence number of the current bag that receives is recorded as PktID, judge the value of PktID-LstPktID, if the value of PktID-LstPktID equals given step-length, can determine that then the sequence number of the bag of current reception links to each other with a last numeric order that receives bag.If order links to each other, then expression does not have packet loss, enters step 305; Otherwise,, enter step 306 if the value of PktID-LstPktID, represents then that packet loss is arranged greater than given step-length.
In the step 305 of Fig. 3, the base station sends the current packet that receives to terminal, and will save as Vn with the sequence number of the consecutive next packet of this packet, is called the sequence number of the packet of current expectation reception.
In the step 306 of Fig. 3, the current bag of receiving is cached to the ordering buffer area of BTS channel plate, and status indicator is set to the state of reordering.The bag of buffer memory can be arranged arbitrarily in this rearrangement buffering area, or arranges by the bag numeric order.By setting up ordering buffer area at channel board, corresponding bag is carried out buffer memory and reorders, thereby can realize buffer memory quickly and easily and reorder after the transmission of bag.In addition, owing to only need judge and to determine whether packet loss, make packet loss judge to implement simple, convenient to sequence number.
In the step 307 of Fig. 3, the current state of reordering that is in, the sequence number Vn of the bag that the sequence number of the current bag that receives and expectation are received compares.If the sequence number of the current bag that receives less than Vn, then enters the step 308 of Fig. 3; If the sequence number of the current bag that receives greater than Vn, then enters the step 309 of Fig. 3; If the sequence number of the current bag that receives equals Vn, then enter the step 310 of Fig. 3.
In the step 308 of Fig. 3, because the sequence number of the bag of current reception, confirms that this bag is duplicate packages whether less than the sequence number Vn that expects to receive bag, abandon, leave over RLP and retransmit correction.
In the step 309 of Fig. 3, because whether the sequence number of the bag of current reception receives the sequence number Vn that wraps greater than expectation, show still to have packet loss, the current bag of receiving is cached to the ordering buffer area of BTS channel plate.
In the step 310 of Fig. 3, because whether the sequence number of the bag of current reception equals to expect to receive the sequence number Vn of bag, this current bag that receives is sent to terminal, the sequence number with Vn is updated to the next one bag of expectation reception can directly add to fixed step size with Vn.
Then, enter the step 311 of Fig. 3, whether the sequence number of judging the bag of sequence number minimum in the ordering buffer area equals Vn, if the step 312 that equals then enter Fig. 3, the bag of this buffer memory is sent to terminal, and will save as Vn with the sequence number of the consecutive next packet of this packet, the packet that promptly current expectation receives; If be not equal to then process ends.
After the step 312 of Fig. 3, enter in the step 313, judge and whether also have cached data packet in the buffering area, if have then return the step 311 of Fig. 3, further sequence number and the Vn with the bag of sequence number minimum in the buffering area compares, if not then the step 314 that enters Fig. 3, status indicator is set to normal condition.
After in the step 306 of Fig. 3 or step 309, the current bag of receiving being cached to ordering buffer area, enter step 315, whether the total amount of judging the bag of buffer memory in this ordering buffer area is greater than predetermined threshold, wherein, predetermined threshold can be the number of the bag that can store of ordering buffer area or data volume to greatest extent.If the total amount of the bag of buffer memory greater than predetermined threshold, then enters step 316, otherwise directly finish.
In the step 316 of Fig. 3, the bag of the sequence number minimum of base station in terminal transmission ordering buffer area.Because during greater than predetermined threshold, directly send the bag of the sequence number minimum of buffer memory in the total amount of the bag of institute's buffer memory, thereby when packet loss (but not out of order bag) takes place the Abis link really, the bag after can normally sending.After step 316, return step 311.
Be that example is illustrated with concrete reception flow process below, if the base station is 1567 when the sequence number of last bag of forward direction terminal transmission, the base station is as follows from the bag that Abis interface received afterwards:
1)CECM0:2007:04:17:15:58:09:405--currentFrameId[1]1569,CurFrmID:1567
2)CECM0:2007:04:17:15:58:09:406--currentFrameId[1]1568,CurFrmID:1569
3)CECM0:2007:04:17:15:58:09:406--currentFrameId[1]1571,CurFrmID:1568
4)CECM0:2007:04:17:15:58:09:408--currentFrameId[1]1570,CurFrmID:1571
Then by present embodiment, following processing will be carried out in the base station in the process that receives above-mentioned bag:
1) base station is 1569 bag from the Abis interface Receive sequence number.
2) sequence number of the bag of the current reception in base station and a last bag sequence number 1567 of reception are compared.Because of 1569 greater than 1567 and discontinuous, so the current packet loss that exists in base station is sequence number that 1569 bag deposits ordering buffer area in.
3) to receive sequence number from Abis interface be 1568 bag in the base station immediately, and because of 1568 mutually continuous with 1567, then the base station sends this bag to terminal.
4) judging whether the sequence number of the bag of buffer memory in the ordering buffer area is mutually continuous with 1568, is 1569 bag because of there being sequence number in the ordering buffer area, and 1569 is mutually continuous with 1568, so the base station sends this bag to terminal.
5) to receive sequence number from Abis interface be 1571 bag in the base station immediately, because 1571 and 1569 is discontinuous, there is packet loss in judgement, and this bag is deposited in ordering buffer area.
6) to receive sequence number from Abis interface be 1570 bag in the base station immediately, and because of 1570 mutually continuous with 1571, thereby the base station sends this bag to terminal, afterwards, with the 4th step, the bag in the buffer memory is judged, sending sequence number in the ordering buffer area to terminal is 1571 bag.
As seen, when having packet loss on the Abis link by detecting in the base station, the current bag of receiving is carried out buffer memory, the bag of the buffer memory back of reordering is sent to terminal, thereby solve because the re-transmission that the Abis link exists out of order bag to cause increases, the bandwidth waste problem, make Abis and the bandwidth availability ratio of eating dishes without rice or wine be improved.
Third embodiment of the invention relates to a kind of package transmission method equally, and is roughly the same with second execution mode, and its difference is, in second execution mode, the base station is a packet from the Abis interface reception, if the bag sequence number of receiving sends to terminal for the bag sequence number that expectation receives with this packet; And in the present embodiment, the base station is a signaling packet from the Abis interface reception, if the bag sequence number of receiving sends to corresponding processing module or upper-layer protocol for the bag sequence number that expectation receives with this signaling packet.
Four embodiment of the invention relates to a kind of package transmission method equally, roughly the same with the second or the 3rd execution mode, its difference is, in the second or the 3rd execution mode, the sequence number of supposing the back packet that BSC sends to the base station order increases progressively to fixed step size than previous packet sequence number, i.e. the sequence number of the bag that the current expectation in base station receives than the sequence number of the bag of the nearest transmission in base station little one to fixed step size; And in the present embodiment, suppose that the sequence number of the back packet that BSC sends to the base station order is successively decreased to fixed step size than previous packet sequence number, i.e. the sequence number of the bag that the current expectation in base station receives than the sequence number of the bag of the nearest transmission in base station big one to fixed step size; Should be a limited natural number to fixed step size, as 1.
That is to say, in the present embodiment, in the sequence number of the bag of the current reception in base station during less than the sequence number Vn of the bag of current expectation, the wrapping of the current reception of buffer memory to buffering area; In the sequence number of the bag of the current reception in base station during, the bag of the current reception in base station is abandoned as duplicate packages greater than the sequence number Vn of the bag of current expectation; When the sequence number of the bag of the current reception in base station equals the sequence number Vn of bag of current expectation, send the bag of the current reception in base station.Each send bag after, Vn is reduced one gives fixed step size, wish the sequence number of the bag that receives as the next one.If the sequence number of the bag of sequence number maximum equates with the sequence number of the bag of current expectation in the buffering area, send the bag of sequence number maximum in the buffering area; If the quantity of the bag in the buffering area surpasses predetermined threshold value, send the bag of sequence number maximum in the buffering area; And handle wraps the bag of receiving as the base station expectation with the consecutive next one of bag that the base station sends sequence number maximum in the buffering area.
The 5th execution mode of the present invention relates to a kind of base station equipment, as shown in Figure 4, comprising: receiving element is used for receiving bag; Buffer unit is used for the buffer memory bag; Transmitting element is used for sending bag; First judging unit is used to judge whether the bag of the current reception of receiving element is the bag of current expectation, if not, then indicate the bag of the current reception of buffer unit buffer memory receiving element; Second judging unit is used for judging whether buffer unit exists the bag of current expectation, if exist, then indicates transmitting element to send the bag of current expectation.Wherein, this buffer unit can be arranged on the channel board of base station.
Need to prove, among the present invention for the sequence number of execution mode just to describing a plurality of execution modes easily, do not represent the execution mode order of quality.
In sum, in embodiments of the present invention, if the bag of the current expectation of Bao Buwei of the current reception in base station, the wrapping of the current reception in buffer memory base station to buffering area; If there is the bag of current expectation in the buffering area, send the bag of current expectation, thereby solve because the re-transmission that the Abis link exists out of order bag to cause increases, the bandwidth waste problem, make Abis and the bandwidth availability ratio of eating dishes without rice or wine be improved.
Set up ordering buffer area at channel board, corresponding bag carried out buffer memory and reordering, thus can realize buffer memory quickly and easily and reorder after the transmission of bag.
Under the state of reordering, at every turn after terminal sends bag, whether the Vn after whether the sequence number of all further judging the bag of buffer memory equals to upgrade is the bag that expectation receives promptly, if equal then send the bag of this buffer memory to this terminal.Thereby the correct bag of guaranteeing to reorder can in time send to terminal.
If the total amount of the bag of institute's buffer memory is greater than predetermined threshold, as the number of the bag of buffer memory greater than predetermined threshold, then send the bag of the sequence number minimum (or maximum) of buffer memory to this terminal, promptly send the immediate bag of bag sequence number that receives with current expectation, thereby when packet loss (but not out of order bag) takes place in Abis link really, the bag after can normally sending.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (12)
1. a package transmission method is characterized in that, may further comprise the steps:
The base station receives bag;
If the bag of the current expectation of Bao Buwei of the current reception in base station, the wrapping of the buffer memory current reception in described base station to buffering area;
If there is the bag of current expectation in the buffering area, send the bag of described current expectation.
2. package transmission method according to claim 1 is characterized in that:
The bag that described current expectation receives is the consecutive next bag of bag that sends with the last time.
3. package transmission method according to claim 2 is characterized in that, the bag that described current expectation receives is for being meant with the consecutive next bag of the bag of the last time transmission:
The sequence number of the bag that current expectation receives than the sequence number of the bag that sends recently big one to fixed step size; Described is a limited natural number to fixed step size.
4. package transmission method according to claim 2 is characterized in that, the bag that described current expectation receives is for being meant with the consecutive next bag of the bag of the last time transmission:
The sequence number of the bag that current expectation receives than the sequence number of the bag that sends recently little one to fixed step size; Described is a limited natural number to fixed step size.
5. package transmission method according to claim 3 is characterized in that,
Described if the bag of the current expectation of Bao Buwei of the current reception in base station, wrapping to the step of buffering area of the buffer memory current reception in described base station is specially: if the sequence number of the bag of the current reception in base station is greater than the sequence number of the bag of current expectation, and the wrapping of the buffer memory current reception in described base station to buffering area;
Described base station receives after the step of bag, and is further comprising the steps of:
If the sequence number of the bag of the current reception in base station is less than the sequence number of the bag of current expectation, the bag of the current reception in described base station is abandoned as duplicate packages;
If the sequence number of the bag of the current reception in base station equals the sequence number of the bag of current expectation, send the bag of the current reception in base station.
6. package transmission method according to claim 5 is characterized in that, described if there is the bag of current expectation in the buffering area, the step that sends the bag of described current expectation is specially:
If the sequence number of the bag of sequence number minimum equates with the sequence number of the bag of current expectation in the described buffering area, send the bag of sequence number minimum in the described buffering area;
And handle wraps the bag of receiving as the base station expectation with the consecutive next one of bag that described base station sends sequence number minimum in the described buffering area.
7. package transmission method according to claim 6 is characterized in that, and is further comprising the steps of:
If the quantity of the bag in the described buffering area surpasses predetermined threshold value, send the bag of sequence number minimum in the described buffering area;
And handle wraps the bag of receiving as the base station expectation with the consecutive next one of bag that described base station sends sequence number minimum in the described buffering area.
8. package transmission method according to claim 4 is characterized in that,
Described if the bag of the current expectation of Bao Buwei of the current reception in base station, wrapping to the step of buffering area of the buffer memory current reception in described base station is specially: if the sequence number of the bag of the current reception in base station is less than the sequence number of the bag of current expectation, and the wrapping of the buffer memory current reception in described base station to buffering area;
Described base station receives after the step of bag, and is further comprising the steps of:
If the sequence number of the bag of the current reception in base station is greater than the sequence number of the bag of current expectation, the bag of the current reception in described base station is abandoned as duplicate packages;
If the sequence number of the bag of the current reception in base station equals the sequence number of the bag of current expectation, send the bag of the current reception in base station.
9. package transmission method according to claim 8 is characterized in that, if there is the bag of current expectation in the buffering area, the step that sends the bag of described current expectation is specially:
If the sequence number of the bag of sequence number maximum equates with the sequence number of the bag of current expectation in the described buffering area, send the bag of sequence number maximum in the described buffering area;
And handle wraps the bag of receiving as the base station expectation with the consecutive next one of bag that described base station sends sequence number maximum in the described buffering area.
10. package transmission method according to claim 9 is characterized in that, and is further comprising the steps of:
If the quantity of the bag in the buffering area surpasses predetermined threshold value, send the bag of sequence number maximum in the described buffering area;
And handle wraps the bag of receiving as the base station expectation with the consecutive next one of bag that described base station sends sequence number maximum in the described buffering area.
11. a base station equipment is characterized in that, comprising:
Receiving element is used for receiving bag;
Buffer unit is used for the buffer memory bag;
Transmitting element is used for sending bag;
First judging unit is used to judge whether the bag of the current reception of described receiving element is the bag of current expectation, if not, then indicate the bag of the current reception of the described receiving element of described buffer unit buffer memory;
Second judging unit is used for judging whether described buffer unit exists the bag of current expectation, if exist, then indicates described transmitting element to send the bag of described current expectation.
12. base station equipment according to claim 11 is characterized in that, described buffer unit is on the channel board of base station.
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CN102377762A (en) * | 2010-08-27 | 2012-03-14 | 中国移动通信有限公司 | Information processing method, device and system in message interaction process |
CN102647353A (en) * | 2012-04-06 | 2012-08-22 | 华为技术有限公司 | Message segment acquiring method and device |
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CN110299974A (en) * | 2018-03-23 | 2019-10-01 | 天地融科技股份有限公司 | A kind of data receiver method and device |
CN112235234A (en) * | 2020-07-30 | 2021-01-15 | 视联动力信息技术股份有限公司 | Data processing method and device, electronic equipment and computer readable storage medium |
CN112491871A (en) * | 2020-11-25 | 2021-03-12 | 北京宝兰德软件股份有限公司 | TCP (Transmission control protocol) recombination method and device, electronic equipment and storage medium |
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