CN1889414B - Method for transmitting status PDU based on missing PDU detection mechanism - Google Patents
Method for transmitting status PDU based on missing PDU detection mechanism Download PDFInfo
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- CN1889414B CN1889414B CN200510080171A CN200510080171A CN1889414B CN 1889414 B CN1889414 B CN 1889414B CN 200510080171 A CN200510080171 A CN 200510080171A CN 200510080171 A CN200510080171 A CN 200510080171A CN 1889414 B CN1889414 B CN 1889414B
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Abstract
This invention provides a method for sending state PDU by a test system based on lost PDU including: a receiving party receives AMD PDU, obtains its sequence number to determine its current anticipantsequence number and the current maximum received number and when it determines the PDU is lost based on the current anticipant sequence number, the received maximum sequence number and the obtained sequence number, it sends state PDU to the sending party. This invention compares the received number with the current anticipant and the current maximum received numbers to find out it loses PDU and avoid frequently reverse-sending state PDU so as to increase data transmission efficiency.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to a kind of based on the method for losing PDU testing mechanism transmit status PDU.
Background technology
In UTRAN (Universal Terrestrial Radio Access Network universal terrestrial access network), AM (affirmation mode), UM (Unacknowledged Mode) and three kinds of patterns of TM (transparent mode) are supported in RLC (Radio Link control) sublayer.Because the general reliability that requires to guarantee data of the QoS (service quality) of data service, therefore the RLC sublayer is adopted AM usually in data service.
Under AM, the PDU of RLC sublayer (protocol Data Unit) type is divided into AMD PDU (data PDU of affirmation mode) and control PDU two big classes.Control PDU can be divided into status PDU, reset PDU again and three kinds of the response pdus of resetting.
The workflow diagram of RLC (Radio Link control) sublayer employing AM as shown in Figure 1.
In Fig. 1, after the RLC sublayer of transmit leg receives PDU from the upper-layer protocol stack, at first carry out the segmentation cascade, add the rlc protocol head then and be assembled into complete AMD PDU, send to the lower-layer protocols stack after finishing operation such as encryption at last according to the size of RLC PDU of configuration; Recipient's RLC sublayer receives the SDU from the lower-layer protocols stack, the SDU of lower-layer protocols stack is corresponding to the AMD PDU of RLC sublayer, recipient's RLC sublayer is at first to operations such as AMD PDU are decrypted, judging whether in conjunction with the sign of the Poll (repeating query) among current state information and the AMD PDU then need be to transmit leg transmit status PDU, at last, after the recipient passes through parsing and reorganization AMD PDU, submit to recipient's upper-layer protocol stack.
The characteristics that transmission error rates is higher, bandwidth resources are valuable that have owing to radio communication, so, the rlc protocol of controlling links sublayer is designed to request retransmission, promptly only explicitly call under the situation of transmitting AMD PDU again and just transmitted again, rather than adopt the overtime re-transmission mode of agreements such as similar TCP the recipient.Recipient's RLC sublayer needs transmission again by which AMD PDU of status PDU notice transmit leg, thereby realizes that selectivity retransmits, rather than the re-transmission fully of go-back-N, has saved the bandwidth resources of aerial interface in the wireless communication system.
The RLC sublayer utilizes data exchange process that status PDU realizes that selectivity retransmits as shown in Figure 2.
In Fig. 2, the RLC sublayer of transmit leg order be the RLC sublayer that 1,2,3 AMD PDU transfers to the recipient with sequence number, because the AMD PDU of sequence number SN=2 loses in transmission course, when recipient's RLC sublayer does not correctly receive at the AMD PDU that determines SN=2, to transmit leg transmit status PDU, transmit leg resends the AMD PDU of SN=2 according to this status PDU.
In said process, the recipient can be based on losing PDU (Missing Pdu) testing mechanism or coming transmit status PDU based on periodicity mechanism.
Below to being elaborated based on the method for losing PDU testing mechanism transmit status PDU.
Before this method is elaborated, need learn about the sliding window mechanism of the flow control that defines in the 3GPP25.322 agreement earlier, specifically as shown in Figure 3:
In Fig. 3, VT (A), VT (S), VT (MS), VR (R), VR (H) and VR (MR) are the state variable of protocol definition.
In send window, VT (A) is the size of send window to the length between the VT (MS), and unit is the quantity of AMD PDU; VT (A) before in order the side of being sent out confirm the AMD PDU of correct reception; VT (A) between the VT (S) for having sent at least once but also do not receive the AMD PDU of the correct receiving state report of receiving entity; VT (S) is to the AMD PDU for allowing to send between the VT (MS).When if transmit leg has new AMD PDU to send, VT (S) moves backward; If transmit leg determines that by the status report of receiving entity sequence number is the AMDPDU of VT (A) when correctly having been received, VT (A) moves backward, and VT (MS) also correspondingly moves backward.
In receive window, VR (R) is the size of receive window to the length between the VR (MR), and unit is the quantity of AMD PDU; VR (R) is the AMD PDU that correctly receives before; VR (R) is to the AMD PDU for allowing to receive between the VR (MR).If the recipient receives sequence number when being the AMD PDU of VR (H) between VR (MR), VR (H) moves backward; If the recipient receives sequence number when being the AMD PDU of VR (R), VR (R) moves backward, and VR (MR) also correspondingly moves backward.
From top introduction as can be known, VR (R) is the AMD PDU that correctly receives before, and VR (R) is the PDU that next expectation receives, if the SN of the AMD PDU that the recipient receives is not equal to VR (R), then clearly must there be AMD PDU to lose, receive direction transmit leg transmit status PDU.
Illustrate the recipient based on the method for losing PDU testing mechanism transmit status PDU below in conjunction with accompanying drawing 4.
Among Fig. 4, receive window Vr (R) under initial situation equals Vr (H), and be 0, lose if first SN is 0 AMD PDU, SN thereafter is 1 to SN to be that 18 AMD PDU is all correctly received, and is 1 to SN to be 18 AMD PDU for SN then, the recipient whenever receives an AMD PDU and all determines to have taken place to lose PDU, thereby the recipient need send 18 next state PDU to transmit leg, thereby has caused the frequent transmission of status PDU.
Because the transmission of status PDU takies the inverse bandwidth resource, particularly when backward channel had data to transmit simultaneously, the frequent transmission of status PDU can reduce the efficient of reverse data transmission.
Summary of the invention
The objective of the invention is to, provide a kind of, avoiding the phenomenon of frequent transmit status PDU, thereby realized improving the purpose of data transmission efficiency based on the method for losing PDU testing mechanism transmit status PDU.
For achieving the above object, provided by the invention a kind of based on the method for losing PDU testing mechanism transmit status PDU, comprising:
A, recipient receive AMD PDU, and obtain the sequence number of this AMD PDU;
B, described recipient determine the sequence number of its current expectation and the maximum sequence number of current reception;
C, described recipient are according to the maximum sequence number of the sequence number of described current expectation, current reception, when the described sequence number that obtains is determined to have taken place to lose PDU, to transmit leg transmit status PDU.
The sequence number of current expectation is among the described step b: the Vr of described recipient's accepting state (R).
The maximum sequence number of current reception is among the described step b: the Vr of described recipient's accepting state (H).
The maximum sequence number of current reception is among the described step b: the Vr of described recipient's accepting state (H)-1.
Described step c comprises:
Described recipient judges the size of the maximum sequence number of the sequence number of the described sequence number that obtains, described current expectation and described current reception;
If the described sequence number that obtains is identical with the numerical value that the sequence number of described current expectation maximum sequence number identical or described sequence number that obtains and described current reception adds after 1, then determine not lose PDU, this method finishes;
Otherwise, determine to have taken place to lose PDU, described receive direction transmit leg transmit status PDU.
Description by technique scheme as can be known, the present invention compares by the sequence number of the AMD PDU that will receive and the sequence number of the current expectation of recipient and the maximum sequence number of current reception, not only can in time find to lose PDU, but also avoided the reverse frequently phenomenon of transmit status PDU, thereby realized improving the purpose of data transmission efficiency by technical scheme provided by the invention.
Description of drawings
Fig. 1 is the workflow diagram that AM is adopted in the RLC sublayer;
Fig. 2 is that the RLC sublayer utilizes status PDU to realize the data interaction flow chart that selectivity retransmits;
Fig. 3 is the sliding window schematic diagram of recipient and transmit leg;
Fig. 4 is that the recipient of prior art is based on the method schematic diagram of losing PDU testing mechanism transmit status PDU;
Fig. 5 is that recipient of the present invention is based on the method flow diagram of losing PDU testing mechanism transmit status PDU.
Embodiment
Core of the present invention is: the recipient receives AMD PDU, and obtain the sequence number of this AMD PDU, described recipient determines the sequence number of its current expectation and the maximum sequence number of current reception, described recipient is according to the maximum sequence number of the sequence number of described current expectation, current reception, when the described sequence number that obtains is determined to have taken place to lose PDU, to transmit leg transmit status PDU.
Based on core concept of the present invention technical scheme provided by the invention is further described below.
Recipient of the present invention at first needs to obtain the sequence number of this AMD PDU when receiving AMD PDU, then the sequence number of this sequence number and the current expectation of recipient and the maximum sequence number of current reception are compared, thereby determine whether to have taken place to lose PDU.
The sequence number of sequence number and current expectation and the maximum sequence number of current reception are compared, be the present invention propose effectively lose the PDU testing mechanism, accepting state with the recipient is that receive window is an example below, and the PDU of losing testing mechanism of the present invention is described.
The Vr of recipient's receive window (R), Vr (H) and Vr (Mr) are the state variable of protocol definition, and Vr (R) is the size of receive window to the length between the Vr (Mr), and unit is the quantity of AMD PDU.
Vr (R) is the sequence number of the AMD PDU of the current expectation reception of recipient, and Vr (R) is the AMD PDU that correctly receives before.Because the recipient upgrades the asynchronism(-nization) of Vr (H), so, the maximum sequence number of the current reception of recipient can be Vr (H), also can be Vr (H)-1, when upgrading Vr (H) again after finishing dealing with as the AMD PDU that each is received as the recipient, the maximum sequence number of the current reception of recipient is Vr (H), and when upgrading Vr (H) before the AMD PDU processing that the recipient is receiving each, then the maximum sequence number of the current reception of recipient is Vr (H)-1.
Recipient's receive window is divided into two parts by Vr (H), a part be Vr (R) to Vr (H), promptly SN ∈ [Vr (R), Vr (H)) part, another part be Vr (H) to Vr (Mr), promptly SN ∈ [Vr (H), Vr (Mr)) part.Vr (R) to the AMD PDU between the Vr (H) be that transmit leg sends, recipient's part of entirely true reception not as yet.Vr (H) is to the zone that does not receive any AMD PDU between the Vr (Mr) for the recipient fully.
For the recipient, its SN of any one legal AMD PDU that transmit leg sends is inevitable within the receive window of Vr (R) and Vr (Mr) formation.If the sequence number SN ∈ of the AMD PDU that the recipient receives [Vr (R), Vr (H)), illustrate that then this AMD PDU is the AMD PDU that belongs to re-transmission, if the sequence number SN ∈ of the AMD PDU that receives [Vr (H), Vr (Mr)) then belong to the AMD PDU of new transmission.
The judgment criterion of losing PDU that the present invention proposes is:
AMD PDU for new transmission, be SN ∈ [Vr (H), Vr (Mr)) AMD PDU, because rlc protocol regulation transmit leg has the intrinsic propesties that order sends, so, SN for any one new transmission is the AMD PDU of X, if PDU then must take place to lose in the not side's of being received reception of AMD PDU that its previous SN is X-1.That is to say,, add numerical value after 1, then determine to have taken place to lose PDU if the sequence number X of this AMD PDU is not equal to the maximum sequence number of the current reception of recipient for the AMD PDU of new transmission.
For the AMD PDU that retransmits, promptly SN ∈ [Vr (H), Vr (Mr)) AMD PDU, because rlc protocol is stipulated transmit leg when retransmitting AMD PDU, the low AMD PDU of inevitable prioritised transmission sequence number, so, if the SN that the recipient receives is not equal to Vr (R), PDU then must take place to lose.That is to say,,, PDU then must take place to lose if when the sequence number X of this AMD PDU is not equal to the sequence number that the current expectation of recipient receives for the AMD PDU that retransmits.
Below according to the situation in the judgment criterion analysis chart 4 of losing PDU of the present invention.
In Fig. 4, receive window is under initial situation, and Vr (R) equates with Vr (H) and be 0 that the sequence number of the i.e. current expectation of recipient is 0.If being 0 AMDPDU, in transmission course, loses first SN, the recipient receives SN when being 1 AMD PDU, because the SN of this AMD PDU is 1, and Vr (R) is 0, the sequence number that is the current expectation of recipient is 0, and the SN of AMD PDU and Vr (R), Vr (H) are all inequality, then determine to have taken place to lose PDU, receive direction transmit leg transmit status PDU, report SN is that 0 AMD PDU loses.
It is 1 AMD PDU that the recipient stores SN, and Vr (H) moves backward, and Vr (H) is 2, and Vr (R) still is 0.
It is 2 AMD PDU that the recipient receives SN in proper order, because the SN of this AMD PDU is 2, and Vr (R) is 0, Vr (H) is 2, the sequence number that is the current expectation of recipient be 0 and the maximum sequence number of the current reception of recipient be 1, the SN of AMD PDU is identical with numerical value behind the maximum sequence number of current reception+1, then determines not lose PDU, and the recipient does not need to transmit leg transmit status PDU.
It is 2 AMD PDU that the recipient stores SN, and Vr (H) moves backward, and Vr (H) is 3, and Vr (R) still is 0.
If being 3 to 18 AMD PDU, SN sends in proper order, the recipient is 3 to 18 AMD PDU according to said method order reception SN, and sequential storage SN is 3 to 18 AMD PDU, and Vr (H) is 19, and Vr (R) still is 0 and does not all need to send the status PDU of losing PDU to transmit leg.
If it is 0 AMD PDU that the recipient receives SN, because the SN of this AMD PDU is 0, and Vr (R) is 0, the sequence number that is the current expectation of recipient is 0, the SN of AMD PDU is identical with the sequence number of the current expectation of recipient, so, determining not lose PDU, the recipient does not need to transmit leg transmit status PDU.
Accompanying drawing 5 is for of the present invention based on the method flow diagram of losing PDU testing mechanism transmit status PDU.
Among Fig. 5, in step 500, the recipient receives AMD PDU.
To step 510, the recipient obtains the sequence number SN of this AMD PDU.
To step 520, the recipient determines the sequence number of its current expectation and the maximum sequence number of current reception.
To step 530, the recipient judges that whether identical with the numerical value that the maximum sequence number of current reception adds after 1 whether identical with the sequence number of current expectation the SN of AMD PDU of the SN of AMD PDU of its reception or above-mentioned reception.If SN is identical with the numerical value that the sequence number of current expectation maximum sequence number identical or SN and current reception adds after 1, to step 540, determine not lose PDU, store this AMD PDU, the sequence number of the current expectation of corresponding change recipient or the maximum sequence number of current reception.To step 500.
In step 530, if the recipient determines that the numerical value that the maximum sequence number of the sequence number of SN and current expectation and current reception adds after 1 is all inequality, then determine to have taken place to lose PDU, to step 550, receive direction transmit leg transmit status PDU, and store this AMD PDU, the maximum sequence number of the current reception of change recipient.To step 500.
Description by said method as can be known, the method of PDU mechanism is lost in the detection that the invention provides, can detect effectively and timely PDU has taken place to lose, in time require the AMDPDU of transmit leg retransmission of lost, avoided simultaneously the phenomenon of reverse frequent transmission status PDU again, thereby the data that make reverse transfer are not subjected to the influence of status PDU, effectively raise data transmission efficiency in the Modern wireless communication environment of two-forty, long delay.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (4)
1. one kind based on the method for losing PDU testing mechanism transmit status PDU, it is characterized in that, comprising:
A, recipient receive AMD PDU, and obtain the sequence number of this AMD PDU;
B, described recipient determine the sequence number of its current expectation and the maximum sequence number of current reception;
C, described recipient are inequality and numerical value that add after 1 with the maximum sequence number of current reception is inequality at the sequence number of determining described sequence number that obtains and described current expectation, then determine to have taken place to lose PDU, to transmit leg transmit status PDU, otherwise, determine not lose PDU, do not need to transmit leg transmit status PDU.
2. as claimed in claim 1 a kind of based on the method for losing PDU testing mechanism transmit status PDU, it is characterized in that, the sequence number of current expectation is the Vr (R) of described recipient's accepting state among the described step b, and described Vr (R) is the sequence number of the AMD PDU of the current expectation reception of recipient.
3. as claimed in claim 1 a kind of based on the method for losing PDU testing mechanism transmit status PDU, it is characterized in that, the recipient upgrades Vr (H) after each AMD PDU that receives is finished dealing with again, and wherein Vr (H) is the maximum sequence number of current reception among the described step b.
4. as claimed in claim 1 a kind of based on the method for losing PDU testing mechanism transmit status PDU, it is characterized in that, the recipient upgrades Vr (H) before the AMD PDU that each is received handles, wherein Vr (H)-1 is the maximum sequence number of current reception among the described step b.
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| CN200510080171A CN1889414B (en) | 2005-06-30 | 2005-06-30 | Method for transmitting status PDU based on missing PDU detection mechanism |
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| CN200510080171A CN1889414B (en) | 2005-06-30 | 2005-06-30 | Method for transmitting status PDU based on missing PDU detection mechanism |
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| CN1889414B true CN1889414B (en) | 2010-05-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10757667B2 (en) | 2017-07-21 | 2020-08-25 | Samsung Electronics Co., Ltd. | Method and user equipment for managing synchronization with network |
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| CN101877882B (en) * | 2009-04-29 | 2013-05-01 | 联芯科技有限公司 | Over domain type selection method and system for entities at acknowledged mode of wireless link control layer |
| CN101631353B (en) * | 2009-08-21 | 2011-08-10 | 普天信息技术研究院有限公司 | Method and device for managing status packet data unit |
| CN102315915A (en) * | 2010-07-01 | 2012-01-11 | 中兴通讯股份有限公司 | Method and device for constructing status report |
| CN102315923B (en) * | 2011-09-01 | 2013-11-20 | 中国空间技术研究院 | Radio link control method of 3G (The 3rd Generation) satellite communication system |
| CN102368700B (en) * | 2011-10-25 | 2014-10-22 | 曙光信息产业(北京)有限公司 | Transmission method of massages in distributed system |
| CN106034014B (en) * | 2015-03-19 | 2020-09-15 | 中兴通讯股份有限公司 | Method for realizing packet loss request retransmission, receiving device and transmitting device |
| CN107147594B (en) * | 2016-03-01 | 2020-06-09 | 深圳市中兴微电子技术有限公司 | Data packet processing method and device |
| CN107659959B (en) * | 2016-07-25 | 2020-10-30 | 普天信息技术有限公司 | Method for reporting data receiving state in private network wireless communication system |
| US10694422B2 (en) | 2017-08-10 | 2020-06-23 | Samsung Electronics Co., Ltd. | Method and apparatus for data processing in wireless communication system |
| KR102465541B1 (en) * | 2017-08-10 | 2022-11-11 | 삼성전자 주식회사 | Method and appatarus for data processing in wireless communication system |
| CN109792327A (en) * | 2018-03-23 | 2019-05-21 | Oppo广东移动通信有限公司 | The method and apparatus of retransmission process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1061688A2 (en) * | 1999-06-17 | 2000-12-20 | Robert Bosch Gmbh | Method for retransmitting messages in a centrally-controlled communication network |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1061688A2 (en) * | 1999-06-17 | 2000-12-20 | Robert Bosch Gmbh | Method for retransmitting messages in a centrally-controlled communication network |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10757667B2 (en) | 2017-07-21 | 2020-08-25 | Samsung Electronics Co., Ltd. | Method and user equipment for managing synchronization with network |
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