CN100379192C - Method for discarding the service data unit in the acknowledgement mode of the RLC protocol and its device - Google Patents

Method for discarding the service data unit in the acknowledgement mode of the RLC protocol and its device Download PDF

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CN100379192C
CN100379192C CNB038264757A CN03826475A CN100379192C CN 100379192 C CN100379192 C CN 100379192C CN B038264757 A CNB038264757 A CN B038264757A CN 03826475 A CN03826475 A CN 03826475A CN 100379192 C CN100379192 C CN 100379192C
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sdu
rlc layer
pdu
rlc
layer pdu
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CN1771685A (en
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刘晟
赵柏峻
李玉麟
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UT SIDAKANG (CHINA) CO Ltd
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UT SIDAKANG (CHINA) CO Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
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Abstract

The present invention provides a method for discarding a service data unit SDU in a protocol acknowledgement mode of a radio link control (RLC) in a radio communication system, which comprises the following steps: A) the SDU of an RLC layer from an upper layer protocol forms a protocol data unit PDU of each RLC layer corresponding to the SDU; B) the PDU of each RLC layer corresponding to the SDU is firstly transmitted and/or retransmitted to a peer layer and judges whether the desired condition for discarding the SDU is satisfied; C) if the preset discarding condition is satisfied, the SDU is discarded; otherwise, the step C) continuously executes the step B) without interruption, wherein the preset discarding condition is that the total retransmission times of at most nRLC layers corresponding to the SDU exceeds a preset threshold, wherein nis more than or equal to 2 but less than or equal to the total number of the PDU of the RLC layer of the SDU. The present invention also provides corresponding devices and systems for realizing the method. The method and the device of the present invention can ensure that the discarding ratio of the SDU can not be influenced by channel speed rate and prevents oversize time delay change from appearance.

Description

The discarding method of service data unit and device thereof in the radio link control affirmation mode
Technical field
Present invention relates in general to the relevant technologies of Radio Link control (RLC) agreement in the wireless communication system, the discarding method of improved service data unit (SDU) in particularly a kind of wireless communication system rlc protocol.
Background technology
Fig. 1 shows the WCDMA radio interface protocol architecture.That as shown in the figure, be positioned at bottom is physical layer (PHY).At control plane, respectively media access control layer (MAC), wireless chain control layer (RLC) and Radio Resource control (RRC) layer on the physical layer.At user plane, except MAC layer and rlc layer, also comprise PDCP (PDCP) layer and broadcast/group broadcast control (BMC) layer.Channel between MAC layer and the physical layer is a transmission channel, and the channel between MAC layer and the rlc layer is a logic channel.To a specific end user device (UE), may there be a plurality of RLC entities, the corresponding different respectively RLC entity of logic channel that this UE is different.
Rlc protocol provides segmentation and retransmission service for user and control data, and each RLC entity is configured to one of three kinds of patterns by RRC: transparent mode (TM), Unacknowledged Mode (UM) and affirmation mode (AM).Wherein TM pattern and UM pattern are mainly used in the real time business relatively more responsive to time delay, and the AM pattern is mainly used in the non real-time packet type business of transmission.For Packet Service, the PDCP layer can improve the availability of frequency spectrum of wireless transmission by the head compression.According to agreements such as 3GPP (third generation collaborative project) TS25.410, TS29.060, TS29.061, the SDU of PDCP layer (being the SDU of rlc layer when no PDCP layer) is the user data packets that is carried on the external packet data net (PDN) on the GTP-U (user's face GPRS Tunnel Protocol).Because PDCP just compresses IP (Internet protocol), UDP (User Datagram Protoco (UDP)), TCP protocol header such as (transmission control protocols) that the IP from GTP-U divides into groups, therefore, no matter whether there is the PDCP layer, the SDU of rlc layer is the user data packets of a corresponding outside PDN, when outside PDN is IP network, promptly corresponding IP grouping.
In IP network, the transport layer protocol that is most widely used is TCP and UDP, the type of interaction that defines among the 3GPP and the non real-time of background type are used, as WWW (web page browsing), email, FTP (file transfer protocol (FTP)) etc., typically all adopt TCP as transport layer protocol, as mentioned above, this type of business is the general RLC that adopts the AM pattern in radio bearer, in this case, the promptly corresponding TCP/IP grouping of the SDU of rlc layer.
As shown in Figure 2, by segmentation and/or be cascaded in the RLC load cell (PU) of regular length and add the rlc protocol head, wherein, the length of PU is a semi-static parameter from the RLC SDU of high level, and it is set up or determine during reprovision at radio bearer.A typical example is, according to TS34.108, the typical PU length of the radio bearer of NRT business is 320 bits, if the MTU (MTU) of IP grouping is 576 bytes, then each rlc layer SDU can be divided into about 15 rlc layer PDU at most, if the MTU of IP grouping is 1500 bytes, then each rlc layer SDU can be divided into about 38 rlc layer PDU at most.At receiving terminal, after all rlc layer PDU of a rlc layer SDU are correctly received, will be rearranged into complete SDU and be sent to high level.
The RLC of AM pattern adopts automatic re-send request may (ARQ) to provide the radio bearer of a low error rate at link layer, thereby improves the performance of Transmission Control Protocol in wireless network.ARQ mechanism is when guaranteeing low error rate, also increased propagation delay time, though this service quality (QoS) influence that non real-times such as type of interaction and background type are used is less, but, to make the retransmission timer of TCP transmitting terminal overtime because of repeatedly retransmitting the excessive time delay that produces, thereby make Transmission Control Protocol think network congestion by mistake and reduce transmission rate, produce the problem that Radio Link utilance and business throughput rate descend thus by flow control function.On the other hand, when enabling the order transmitting function, repeatedly retransmitting of rlc layer causes easily that also the buffering area of transmitting terminal and receiving terminal overflows.About radio link layer Technique on T CP Effect on Performance, can be with reference to the RFC3481 " TCP over Second and ThirdGeneration Wireless Networks " of IETF (internet engineering task group), people's such as Hari Balakrishnan paper " AComparison of Mechanisms for Improving TCP Performance overWireless Links ", IEEE/ACM Transactions on Networking, Vol.5, No.6, Dec.1997.
Above-mentioned in order to reduce because of repeatedly retransmitting the excessive time delay that produces, and producing the problem of Radio Link utilance and business throughput rate decline thus, the discarding method that generally adopts Radio Link to control service data unit (SDU) in (RLC) agreement is finished the transmission of SDU and is handled.
In the WCDMA wireless communication system, the RLC of AM pattern can adopt three kinds of SDU to abandon one of mode: the mode that abandons based on timer, the SDU after retransmitting for MaxDAT time with clear and definite signaling abandon mode, do not abandon mode after MaxDAT re-transmissions.In above-mentioned three kinds of modes, after MaxDAT re-transmission, do not abandon mode and will after the rlc layer PDU of AM pattern number of retransmissions reaches MaxDAT, directly trigger the reseting procedure of rlc layer, so range of application is less.Having clear and definite signaling shows as based on the mode that abandons of timer: to each SDU from high level, start the timer that monitors this SDU transmission time, if this SDU is not successfully transmitted yet in the given time, transmitting terminal will abandon this SDU, and, if the part segmentation of this SDU sends, transmitting terminal will use the band inner control order of movably receiving window (MRW), make the receive window of receiving terminal and receive buffering area to do corresponding the renewal.Have the maximum delay constraint that clear and definite signaling is fixed owing to employing based on the mode that abandons of timer, though help improving performance and the QoS such as throughput of upper-layer protocol such as TCP, this mode causes that easily more SDU is dropped when channel speed changes.SDU after retransmitting for MaxDAT time abandon mode with have clear and definite signaling based on timer to abandon mode opposite, its adopts fixing maximum retransmission constraint, is changed to the constant SDU loss ratio of cost assurance with time delay.According to up-to-date 3GPP standard TS25.322V5.4.0 (2003-03), abandon in the mode at the SDU after MaxDAT time retransmits, in case the rlc layer PDU number of retransmissions of an AM pattern reaches MaxDAT, transmitting terminal will abandon all relevant SDU that has the part segmentation in this PDU, and all PDU of these the SDU correspondences that are dropped in send window, transmitting terminal will be with the inner control order by MRW simultaneously, make the receive window of receiving terminal and receive buffering area to do corresponding the renewal.
According to foregoing description as can be known, in current rlc protocol, the SDU after retransmitting for MaxDAT time abandons mode and is based on judgement that whether number of retransmissions to its corresponding PDU reach predetermined maximum times MaxDAT and triggers and abandon SDU.As previously mentioned, in the practical application SDU often corresponding a plurality of PDU, and unsuccessful probability takes place nearly to retransmit for MaxDAT time in a PDU, the total degree that re-transmission will take place far below each PDU of a SDU correspondence reaches the probability of MaxDAT.On the other hand, because after the RLC receiving terminal need wait for that all rlc layer PDU of a SDU correspondence all fully successfully receive, could be by recombinating this SDU and submit to high level, like this, technology based on current protocol specification, SDU after MaxDAT re-transmission abandons mode and can not control the SDU propagation delay time effectively, it is too high because in case the PDU of certain SDU correspondence always retransmits number of times, but when each PDU number of retransmissions separately is lower than MaxDAT again, bigger time delay will be produced, this may make the retransmission timer of TCP transmitting terminal overtime, thereby makes Transmission Control Protocol do the control that makes mistake to transmission rate.
Summary of the invention
In order to solve the aforementioned problems in the prior, the invention provides improved SDU discarding method in a kind of wireless communication system rlc protocol, be used to realize the equipment of this discarding method, and the wireless communication system that uses this equipment.
According to a first aspect of the invention, provide the discarding method of service data unit (SDU) in a kind of wireless communication system Radio Link control (RLC) protocol validation pattern, this method may further comprise the steps:
A) will after segmentation and cascade processing, form each rlc layer protocol Data Unit (PDU) of this SDU correspondence from the rlc layer SDU of upper-layer protocol;
B) each rlc layer PDU with this SDU correspondence just passes and/or is retransmitted to peer layer one by one through rlc layer transmitting terminal functional entity, and according to judging whether satisfy the predetermined condition that abandons this SDU from the state information of peer layer;
C) abandon condition if satisfy described being scheduled to, then abandon this SDU; Otherwise, execution in step B interruptedly not continuously), all successfully be sent to the peer layer receiving terminal up to all rlc layer PDU of this SDU correspondence;
Wherein, at step B) in the described predetermined condition that abandons be that total re-transmission number of times of n rlc layer PDU of this SDU correspondence is above a predetermined threshold, n 〉=2 but wherein smaller or equal to the sum of the rlc layer PDU of described SDU, and wherein this predetermined threshold is with described predetermined to abandon condition corresponding.
According to a second aspect of the invention, provide to be used in a kind of wireless communication system realizing that Radio Link control (RLC) agreement abandons the equipment of the function of service data unit (SDU), this equipment comprises:
Segmentation and cascade processing unit are used for the rlc layer SDU from upper-layer protocol is formed after treatment each rlc layer protocol Data Unit (PDU) of this SDU correspondence;
Dispensing device is used for each rlc layer PDU of this SDU correspondence is just passed and/or be retransmitted to peer layer one by one through rlc layer transmitting terminal functional entity;
Decision maker is used for according to judging whether satisfy the predetermined condition that abandons this SDU from the state information of peer layer;
Drop device, be used for satisfying described predetermined this SDU that abandons when abandoning condition, otherwise, continuously interruptedly each rlc layer PDU of this SDU correspondence is not carried out just passing and/or retransmitting by described dispensing device, all successfully be sent to the peer layer receiving terminal up to all rlc layer PDU of this SDU correspondence;
Wherein, the described predetermined condition that abandons is that total re-transmission number of times of n rlc layer PDU of this SDU correspondence is above a predetermined threshold, n 〉=2 but wherein smaller or equal to the sum of the rlc layer PDU of described SDU, and wherein this predetermined threshold is with described predetermined to abandon condition corresponding.
According to a third aspect of the invention we, a kind of wireless communication system is provided, comprise core net (CN), wireless access network (UTRAN), end user device (UE), and the equipment that is used for when satisfying the condition of service data unit (SDU) of abandoning of being scheduled to, abandoning this SDU in Radio Link control (RLC) agreement, wherein, the described equipment that is used for realizing abandoning the SDU function is the equipment that Radio Link control (RLC) agreement of providing as above-mentioned second aspect present invention realizes abandoning the function of service data unit (SDU).
According to a preferred embodiment of the present invention, at the rlc layer transmitting terminal number of retransmissions summation from all PDU of high-rise SDU correspondence is added up, in case this total number of retransmissions reaches a predetermined threshold value, transmitting terminal will abandon all PDU of this SDU and this SDU correspondence in send window, transmitting terminal will adopt mode same as the prior art simultaneously, by the order of MRW band inner control, make the receive window of receiving terminal and receive buffering area and do corresponding the renewal.
According to a further advantageous embodiment of the invention, when the number of retransmissions summation of each PDU that adds up a SDU correspondence, also should add up interior to those number of retransmissions that except the part segmentation that comprises this SDU, also comprised the PDU of other SDU part segmentation.
The present invention compared with prior art both can guarantee that the SDU loss ratio was not subjected to the influence of channel speed, can prevent excessive time delay again to a certain extent and change.
Description of drawings
By the detailed description of the specific embodiment of the invention being carried out in conjunction with each accompanying drawing, purpose of the present invention, characteristics and benefit will become more obvious.Wherein:
Fig. 1 is the schematic diagram of radio interface protocol architecture in the WCDMA wireless communication system;
Fig. 2 is the segmentation of rlc layer SDU in the RLC wireless protocols affirmation mode (AM pattern) and the schematic diagram of cascade;
Fig. 3 is the flow chart according to a specific embodiment of SDU discarding method of the present invention;
Fig. 4 is the detail flowchart of step S40 in the flow chart shown in Fig. 3.
Embodiment
Below with reference to each accompanying drawing, to a specific embodiment of the present invention, promptly the specific embodiment of the SDU discarding method of each rlc layer PDU of a SDU correspondence after pre-determined number (being TotalMaxDAT time in the present embodiment) retransmits is elaborated.
Fig. 3 is treated to example with the transmission of a SDU, shows the flow chart of a specific embodiment of SDU discarding method of the present invention.As shown in Figure 3,, at first enter the segmentation and the cascade processing unit of AM pattern rlc layer transmitting terminal, after this cell processing, form each rlc layer PDU of this SDU correspondence from the rlc layer SDU of upper-layer protocol at step S20.Each rlc layer PDU that will add up this SDU correspondence at step S30 always retransmits the counter Counter_ReTrans zero clearing of number of times.At step S40, utilize the SDU discarding method of inventing to finish the transmission of this SDU is handled.At step S50, the transmission processing of this SDU finishes, and its possibility of result is that this SDU is dropped, or this SDU successfully is sent to the peer layer receiving terminal.
Fig. 4 has described the processing of being carried out in further detail in the step S40 of Fig. 3.As shown in Figure 4, at step S100, does the transmitting terminal of rlc layer PDU judge whether that according to the state information from peer layer that produces the rlc layer PDU needs of this SDU correspondence retransmit in the transport process of this SDU? do not retransmit if do not need, then then judge whether that at step S160 all rlc layer PDU of this SDU correspondence have successfully sent to the peer layer receiving terminal? if judged result is a "Yes", then finish the transmission of this SDU and handle (step S50), otherwise, continue to wait for the next one judged from the state information that peer layer transmits.If judging in step S100 has rlc layer PDU to need to retransmit, then in step S110, upgrade retransmission counter Counter_ReTrans, i.e. Counter_ReTrans ← Counter_ReTrans+k, wherein k is the quantity of the rlc layer PDU that needs to retransmit.Do you then, judge at step S120 whether the value of this counter Counter_ReTrans surpasses predetermined threshold value TotalMaxDAT? this predetermined threshold is to abandon the maximum gross that each rlc layer PDU of this SDU correspondence of condition allowed corresponding to this SDU to pass number of times.If the value of counter Counter_ReTrans surpasses this predetermined threshold, then this SDU is carried out discard processing at step S130 and S140, transmitting terminal makes the receive window of peer layer receiving terminal and receives buffering area and do corresponding renewal by the order of MRW band inner control.And transmitting terminal abandons this SDU, comprises the backup that is discarded in this SDU that transmitting terminal keeps and all PDU of this SDU correspondence in send window.Do not surpass described predetermined threshold TotalMaxDAT if judge the value of counter Counter_ReTrans at step S120, then carry out retransmission process at step S170, that is, transmitting terminal needs the rlc layer PDU that retransmits to retransmit to indication in the state information.
Predetermined threshold TotalMaxDAT among this embodiment be according to the require SDU loss ratio that satisfies and requiring of preventing that excessive time delay changes predetermined, therefore can change according to real needs at an easy rate.
Please note, though for clarity, the flow chart of Fig. 4 is drawn in the retransmission process of corresponding rlc layer PDU in the independent square frame (S170), but those skilled in the art are to be understood that, when reality realizes, to judging the re-transmission of the rlc layer PDU of the SDU correspondence that needs retransmit according to certain state information, and first biography and/or the re-transmission of other rlc layers PDU of this SDU correspondence carried out simultaneously.That is to say that described other rlc layers PDU may include only the first RCL layer PDU that passes of needs of this SDU, may be RCL layer PDU that will just pass and the combination of judging the rlc layer PDU that needs re-transmission in last time handling.Certainly, also may be that described other rlc layers PDU has successfully sent to the peer layer receiving terminal, then only this is judged that the rlc layer PDU that needs re-transmission carries out retransmission process and gets final product in this case.And, in the rlc layer PDU that above-mentioned judgement need retransmit, have in addition may be the rlc layer PDU that had retransmitted repeatedly.Unless judge and satisfy the condition that abandons this SDU, otherwise the transmission of this each rlc layer PDU to the SDU correspondence (comprising the rlc layer PDU that first biography and needs retransmit) will interruptedly not carried out continuously, even at execution in step S100, S110, S120 does not interrupt in the time of S160 and S170 yet.In addition, the state information of mentioning in step S100 from peer layer is transferred to transmitting terminal from peer layer.And the transmission of state information can utilize multiple mode to start, for example when the polling ratio of data PDU (AMDPDU) during specially for " 1 "; Perhaps used status PDU transfer function, and timer Timer_Status_Periodic is overtime based on timer, or the like.The transmission of state information also may be delayed, for example when having used the status PDU prohibiting function.Specifically use the status information transmission mechanism of which kind of form, then depend on the specific implementation of system.Thus, the renewal step-length " k " of the counter Counter_ReTrans that mentions among the step S110 just may be " 1 " (when definite rlc layer PDU need retransmit with regard to transmitting state information), or greater than 1 smaller or equal to any integer of the rlc layer PDU sum of this SDU correspondence (depending on the time interval of status information transmission and the quantity of the rlc layer PDU that the needs determined retransmit in this time interval).Need explanation at this, the content described in this section literal all is known in the communications field, and for realizing that SDU discarding method of the present invention is not crucial.
Should point out emphatically, the SDU after TotalMaxDAT time retransmits of the present invention that describes in the above abandons in the specific implementation method of mode, just be described at the process of transmitting of a rlc layer SDU, in specific implementation, the send window of certain width sends because the RLC transmitting terminal of AM pattern is based on, the influence that is retransmitted, may exist the SDU of a plurality of rlc layers all successfully not sent to the situation of the receiving terminal of peer layer, therefore, in specific implementation, to among these SDU each, should adopt separately independently retransmission counter Counter_ReTrans respectively.
Understand easily, SDU discarding method of the present invention is that total re-transmission number of times of maximum n the rlc layer PDU of this SDU is counted, and wherein n is more than or equal to 2 and smaller or equal to the sum of the rlc layer PDU of this SDU correspondence.Whether the value of judging resulting total re-transmission number of times then surpasses certain predetermined threshold value, thereby judges whether to satisfy the condition that abandons this SDU.In the above preferred embodiment of the present invention that reference Fig. 3 and Fig. 4 describe, n gets all the rlc layer PDU numbers corresponding integer corresponding with SDU, and this is equivalent to total re-transmission number of times of all rlc layer PDU of SDU correspondence is counted and judged.But, selection to described n rlc layer PDU can be diversified, for example, should corresponding n rlc layer PDU at least both can be n continuous PDU, also can be n PDU at interval, count and judge as the individual number of retransmissions of rlc layer PDU accordingly of the n of antithesis numerical digit or odd bits, or the like.
According to the description of the foregoing description, those skilled in the art are easy to expect except that above-named example the selection mode of other the rlc layer PDU that its number of retransmissions is counted, and these selection modes all will be understood that and belong to protection scope of the present invention.
In addition, in other embodiments of the invention, also can the SDU discarding method of the prior art of the number of retransmissions of aforesaid single rlc layer PDU based on SDU and the present invention above-mentioned combine application based on the corresponding SDU discarding method of total re-transmission number of times of n rlc layer PDU at most of this SDU.As long as the SDU that satisfies in any discarding method abandons condition, just abandon corresponding SDU.
According to other specific embodiments of the present invention, when the number of retransmissions of each PDU that adds up a SDU correspondence,, also should add up interior to those PDU that except the part segmentation that comprises this SDU, has also comprised other SDU part segmentation.When in send window, abandoning the rlc layer PDU of this SDU correspondence, should not abandon those have also comprised other SDU part segmentations except the part segmentation that comprises this SDU PDU when determining to abandon a SDU.
In the various embodiments described above, cascade and segment processing to SDU, judge that satisfy SDU predetermined abandons this SDU after abandoning condition, and it is identical with above-mentioned corresponding step with reference to figure 3 and Fig. 4 description to judge that do not satisfy SDU predetermined interruptedly just do not pass and/or retransmit the steps such as each rlc layer PDU of this SDU continuously when abandoning condition, so do not repeat them here.
Though should be appreciated that above-mentioned description to specific embodiments of the invention is to realize under the environment of WCDMA (wideband CDMA) wireless communication system, method of the present invention also can be used for realizing abandoning of SDU at similar other wireless communication systems.
In addition, the SDU discarding method of describing in the above-mentioned specific embodiment of the present invention is realized with corresponding Control Software, but, also can adopt various hardware unit well known in the art to realize the wherein function of each step, thereby be provided for realizing the equipment and the system of SDU discarding method of the present invention.
Though above invention has been described in conjunction with some specific embodiments,, it will be appreciated by those skilled in the art that under the prerequisite that does not deviate from basic principle of the present invention and spirit, can also make various modifications to the present invention.So protection scope of the present invention is not limited to above-mentioned specific embodiment, but limit by attached claim.

Claims (21)

1. the discarding method of service data unit SDU in the wireless communication system Radio Link control rlc protocol affirmation mode, this method may further comprise the steps:
A) will after segmentation and cascade processing, form each rlc layer protocol Data Unit PDU of this SDU correspondence from the rlc layer SDU of upper-layer protocol;
B) each rlc layer PDU with this SDU correspondence just passes and/or is retransmitted to peer layer one by one through rlc layer transmitting terminal functional entity, and according to judging whether satisfy the predetermined condition that abandons this SDU from the state information of peer layer;
C) abandon condition if satisfy described being scheduled to, then abandon this SDU; Otherwise, execution in step B interruptedly not continuously), all successfully be sent to the peer layer receiving terminal up to all rlc layer PDU of this SDU correspondence;
It is characterized in that: at step B) in the described predetermined condition that abandons be that total re-transmission number of times of n rlc layer PDU of this SDU correspondence is above a predetermined threshold, n 〉=2 but wherein smaller or equal to the sum of the rlc layer PDU of described SDU, and wherein this predetermined threshold is with described predetermined to abandon condition corresponding.
2. the discarding method of SDU in the wireless communication system rlc protocol affirmation mode as claimed in claim 1 is characterized in that: described n rlc layer PDU is n continuous PDU.
3. the discarding method of SDU in the wireless communication system rlc protocol affirmation mode as claimed in claim 2 is characterized in that: all rlc layer PDU that described n continuous rlc layer PDU is described SDU correspondence.
4. the discarding method of SDU in the wireless communication system rlc protocol affirmation mode as claimed in claim 1 is characterized in that: described n rlc layer PDU is a discontinuous n PDU.
5. as the discarding method of SDU in each described wireless communication system rlc protocol affirmation mode among the claim 1-4, it is characterized in that: when whether total re-transmission number of times of n the rlc layer PDU that judges described SDU correspondence surpasses described predetermined threshold, also the number of retransmissions of each rlc layer PDU of this SDU is judged, when total re-transmission number of times of described n rlc layer PDU surpasses described predetermined threshold, when the number of retransmissions of perhaps some rlc layer PDU surpasses another predetermined threshold, then abandon described SDU, wherein, this another predetermined threshold is according to predeterminedly abandoning condition and determine with the number of retransmissions of the rlc layer PDU of this SDU being pairing.
6. as the discarding method of SDU in each described wireless communication system rlc protocol affirmation mode among the claim 1-4, it is characterized in that: also count for the number of retransmissions of rlc layer PDU that not only contains the part segmentation of described SDU but also contain the part segmentation of other SDU different with described SDU.
7. as the discarding method of SDU in each described wireless communication system rlc protocol affirmation mode among the claim 1-4, judgement it is characterized in that: when need abandon described SDU, in send window, abandon all rlc layer PDU of the part segmentation that only comprises this SDU of this SDU correspondence, and do not abandon those have also comprised other SDU part segmentations except the part segmentation that comprises this SDU PDU.
8. be used for realizing that Radio Link control rlc protocol abandons the equipment of the function of service data unit SDU in a wireless communication system, this equipment comprises:
Segmentation and cascade processing unit are used for the rlc layer SDU from upper-layer protocol is formed after treatment each rlc layer protocol Data Unit PDU of this SDU correspondence;
Dispensing device is used for each rlc layer PDU of this SDU correspondence is just passed and/or be retransmitted to peer layer one by one through rlc layer transmitting terminal functional entity;
Decision maker is used for according to judging whether satisfy the predetermined condition that abandons this SDU from the state information of peer layer;
Drop device, be used for satisfying described predetermined this SDU that abandons when abandoning condition, otherwise, continuously interruptedly each rlc layer PDU of this SDU correspondence is not carried out just passing and/or retransmitting by described dispensing device, all successfully be sent to the peer layer receiving terminal up to all rlc layer PDU of this SDU correspondence;
It is characterized in that: the described predetermined condition that abandons is that total re-transmission number of times of n rlc layer PDU of this SDU correspondence is above a predetermined threshold, n 〉=2 but wherein smaller or equal to the sum of the rlc layer PDU of described SDU, and wherein this predetermined threshold is with described predetermined to abandon condition corresponding.
9. be used in the wireless communication system as claimed in claim 8 realizing that Radio Link control rlc protocol abandons the equipment of the function of service data unit SDU, it is characterized in that: described n rlc layer PDU is n continuous PDU.
10. be used in the wireless communication system as claimed in claim 9 realizing that Radio Link control rlc protocol abandons the equipment of the function of service data unit SDU, it is characterized in that: all rlc layer PDU that described n continuous rlc layer PDU is described SDU correspondence.
11. be used in the wireless communication system as claimed in claim 8 realizing that Radio Link control rlc protocol abandons the equipment of the function of service data unit SDU, it is characterized in that: described n rlc layer PDU is a discontinuous n PDU.
12. realize that as being used in each described wireless communication system among the claim 8-11 Radio Link control rlc protocol abandons the equipment of the function of service data unit SDU, it is characterized in that: when whether total re-transmission number of times of n the rlc layer PDU that judges described SDU correspondence surpasses described predetermined threshold, also the number of retransmissions of each rlc layer PDU of this SDU is judged, when total re-transmission number of times of described n rlc layer PDU surpasses described predetermined threshold, when the number of retransmissions of perhaps some rlc layer PDU surpasses another predetermined threshold, then abandon described SDU, wherein, this another predetermined threshold is according to predeterminedly abandoning condition and determine with the number of retransmissions of the rlc layer PDU of this SDU being pairing.
13., it is characterized in that: also count for the number of retransmissions of rlc layer PDU that not only contains the part segmentation of described SDU but also contain the part segmentation of other SDU different with described SDU as being used in each described wireless communication system among the claim 8-11 realizing that Radio Link control rlc protocol abandons the equipment of the function of service data unit SDU.
14. realize that as being used in each described wireless communication system among the claim 8-11 Radio Link control rlc protocol abandons the equipment of the function of service data unit SDU, judgement it is characterized in that: when need abandon described SDU, in send window, abandon all rlc layer PDU of the part segmentation that only comprises this SDU of this SDU correspondence, and do not abandon those have also comprised other SDU part segmentations except the part segmentation that comprises this SDU PDU.
15. wireless communication system, comprise core net CN, wireless access network UTRAN, end user device UE, and the equipment that is used for abandoning when satisfying the predetermined condition that abandons service data unit SDU at Radio Link control rlc protocol this SDU, it is characterized in that: the described equipment that is used for realizing abandoning the SDU function is the equipment that Radio Link control rlc protocol as claimed in claim 8 realization abandons the function of service data unit SDU.
16. wireless communication system as claimed in claim 15 is characterized in that: described n rlc layer PDU is n continuous PDU.
17. wireless communication system as claimed in claim 16 is characterized in that: described n continuous rlc layer PDU is all rlc layer PDU of described SDU correspondence.
18. wireless communication system as claimed in claim 15 is characterized in that: described n rlc layer PDU is a discontinuous n PDU.
19. as each described wireless communication system among the claim 15-18, it is characterized in that: when whether total re-transmission number of times of n the rlc layer PDU that judges described SDU correspondence surpasses described predetermined threshold, also the number of retransmissions of each rlc layer PDU of this SDU is judged, when total re-transmission number of times of described n rlc layer PDU surpasses described predetermined threshold, when the number of retransmissions of perhaps some rlc layer PDU surpasses another predetermined threshold, then abandon described SDU, wherein, this another predetermined threshold is according to predeterminedly abandoning condition and determine with the number of retransmissions of the rlc layer PDU of this SDU being pairing.
20., it is characterized in that: also count for the number of retransmissions of rlc layer PDU that not only contains the part segmentation of described SDU but also contain the part segmentation of other SDU different with described SDU as each described wireless communication system among the claim 15-18.
21. as each described wireless communication system among the claim 15-18, judgement it is characterized in that: when need abandon described SDU, in send window, abandon all rlc layer PDU of the part segmentation that only comprises this SDU of this SDU correspondence, and do not abandon those have also comprised the part segmentation of other SDU except the part segmentation that comprises this SDU PDU.
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