CN1411227A - Method and device for promoting quick sliding of radio link control layer data transmission window - Google Patents

Abstract

This invention discloses a method for pushing forward the data send window of wireless link control layer to quick slide, which records corresponding relationship between PDU and TTI data blocks orderly received by MAC-hs at the sending end and bufferly stores the authenticated information to TTI data block received according to orderly sending ordinal number in a TTI ACK array. When the first TTI data block and successive N-1 TTI data blocks are certificated, the corresponding PDU numbers of the first N TTI are calculated to generate reporting signaling to RLC labeling the send order to find out M PDU actual ordinal number then mark with certification or giving up and trigger PDU sending window to slide backward.

Description

Promote method and device that radio link control layer data transmission window slides fast

Technical field

The present invention relates to the transfer control method of bag data in the wireless communication system, relate in particular to the method that wireless chain control layer (RLC) protocol Data Unit (PDU) send window slides fast that how to promote.

Background technology

In HSDPA (access of high-speed downstream bag data) architecture, the peer-to-peer of MAC-hs (high speed media Access Layer) and wireless chain control layer and interlayer relation are with reference to figure 1.Because rlc layer is on the MAC-hs layer, when transmitting terminal RLC when receiving terminal RLC sends PDU, need could realize by the MAC-hs layer.When transmitting terminal RLC when MAC-hs sends PDU in its send window, MAC-hs will receive PDU and be encapsulated in the corresponding transmission block group (TBS) of Transmission Time Interval (TTI), (HS-DSCH) is sent to receiving terminal by high speed descending sharing channel.Receiving terminal MAC-hs returns a confirmation (ACK) to each correct TTI data block that receives, and simultaneously decoded PDU is sent to RLC.Receiving terminal RLC confirms (STATUS PDU) message informing transmitting terminal RLC with the sequence number of correct PDU by PDU actively or passively, triggers its PDU send window and slides backward.

The feedback information of receiving terminal MAC-hs (ACK) is at each TTI data block, because the TTI data block affirmation order that the multichannel transmission obtains may be inconsistent with sending order, for not being subjected to its data block, the affirmation that makes TTI do not receive influence out of order and the PDU type that is comprised, can carry out unique identification to TTI by sending order at transmitting terminal MAC-hs, such as adding a transmission sequence number (TSN) for each TTI.If receiving terminal correctly receives the data block of certain TTI, then in the affirmation message of its feedback, indicate the TSN of this TTI, transmitting terminal MAC-hs knows that promptly the data of this TTI successfully receive.Because transmitting terminal is understood the encapsulation corresponding relation between each TTI and the PDU, so the TSN of TTI and PDU have also just had unique corresponding relation.

Transmitting terminal knows that the TTI data block abandoned two kinds of situations: the one, repeatedly receive clear and definite failure acknowledge message, and number of times surpasses the maximum number of retransmissions that allows; Two are based on the timeout mechanism of agreement, and the TTI data block of unreceived successful acknowledge message in the fixed time is masked as failure.If the TTI data block is flagged as failure, then its corresponding PDU is also abandoned, abandoned PDU will be apprised of RLC, make the PDU send window of RLC force to slide backward.

Because MAC-hs layer and rlc layer all need to provide feedback information to transmitting terminal.One is the affirmation to the TTI data block, and another is the affirmation to PDU.Because TTI data block and PDU have the encapsulation corresponding relation, the correct reception of TTI data block just means the correct reception of the PDU that it carries, and the TTI data block is abandoned meaning, and its PDU that carries is not received, thereby in fact above-mentioned two-layer acknowledge message repeats.And, affirmation message between the RLC need be through postponing bigger Iur/Iub interface (interface/radio network controller between the radio network controller and the interface between the base station), and through after the wireless transmission of error code is arranged, caused the hysteresis of transmitting terminal PDU send window control, thereby the delay that has caused expending channel resource and transfer of data.For these reasons, the PDU acknowledge message only regularly or under the condition of transmitting terminal request is just sending, like this, the PDU send window that the successful reception of a small amount of PDU can't in time trigger transmitting terminal slides, and has further strengthened the waste of channel resource and the noncontinuity and the delay of transfer of data.

Summary of the invention

The object of the present invention is to provide a kind of method and device that radio link control layer data transmission window slides fast that promote, use this method or device can improve the efficiency of transmission of system data, improve transmission performance, and the waste that reduces channel resource.

For achieving the above object, the method that promotion radio link control layer data transmission window provided by the invention slides fast comprises:

(1) corresponding relation between the set of data blocks (being called for short the TTI data block) that transmits among the PDU of transmitting terminal record high speed media Access Layer (MAC-hs) order reception and each TTI (Transmission Time Interval);

(2) transmitting terminal MAC-hs sets up a TTIACK (affirmation) formation by the order of TTI transmit Sequence Number (TSN), is used for the TT I confirmation that the buffer memory receiving terminal will feed back;

(3) the TTI confirmation that receives according to transmitting terminal MAC-hs is marked in the described TTI ACK formation;

(4) when described TTI ACK formation from first TTI data block that is identified and continuous thereafter N-1 (N＞0) when the TTI data block all is identified, add up the described TTI data block that first is identified and reach the PDU quantity that encapsulates in N-1 the continuous thereafter TTI data block, generation comprises the signaling that reports of this quantity, type code in the signaling is set to: the PDU that affirmation is reported directly reports transmitting terminal RLC by transmitting terminal MAC-hs then;

(5) when first TTI of described TTI ACK formation does not obtain confirmation yet after the re-transmission through maximum permission number of times, this element is done the report processing identical with above-mentioned steps (4), but will report the type code in the signaling to change into: abandon the PDU that reported.

(6) RLC confirms and triggers its PDU send window slip according to the described signaling that reports to corresponding PDU (protocol Data Unit),, confirmed PDU is shifted out the PDU send window.

Described method also comprises:

Create the table of comparisons between PDU and the TTI TSN (transmission sequence number), be used to write down the PDU data of MAC-hs reception and the corresponding relation between each TTI data block, so that be the affirmation information of PDU the affirmation information translation of the TTI data block that receives.

Create PDU transmitting sequence record sheet at RLC, be used to write down the order that RLC issues PDU, the sequence consensus of the PDU that this order receives with MAC-hs, so that in the RLC transmit queue, find the PDU itself that successfully sends according to the described quantity of the successful PDU in the signaling that reports, make MAC-hs not need to understand the sequence number of PDU at rlc layer, only just can finish the mapping of PDU to the TTI data block according to the transmitting sequence of PDU, and the affirmation information that guarantees TTI can correctly be mapped to the PDU itself among the RLC, the described influence that reports signaling not to be subjected to out of order factor such as rlc layer PDU re-transmission that makes MAC-hs.

Affirmation information by MAC-hs reports control unit to preserve the last signaling parameter that reports, and judges that in order to reporting signaling bust this, error code or RLC PDU quantity resends when illegal.

After once reporting operation to finish, the described TTI ACK formation and the described TSN-PDU table of comparisons are refreshed, the top n element that is mapped as the PDU confirmation and has reported is deleted from the described formation and the described table of comparisons, so that begin to handle from original N+1 the element of the described formation and the described table of comparisons.

The present invention also provides a kind of device that radio link control layer data transmission window slides fast that promotes simultaneously, and described device comprises:

PDU formation module among the RLC, this module comprises the PDU send window, is used to store and send PDU to be sent;

TSN-PDU table of comparisons module: be used to write down PDU that the high speed media Access Layer receives in proper order and the corresponding relation between each TTI data block, so that will receive the affirmation information that the affirmation information translation of TTI becomes PDU;

TTI ACK formation module: be used for the TTI confirmation of discontinuous reception is converted to continuous TTI confirmation, and then obtain continuous PDU confirmation, make the high speed media Access Layer that the number of the PDU that need report only need be provided when reporting PDU to confirm to RLC or abandoning information, and do not need to provide the sequence number of each PDU, report the scale of signaling with remarkable minimizing, improve the probability that at every turn reports the PDU send window that triggers RLC to slide simultaneously;

Confirmation (ACK) reports control module: the TTI data block confirmation that execution receives MAC-hs is saved in the operation in the TTI ACK formation module; Control TTI ACK formation is to the mapping of the TSN-PDU table of comparisons; The PDU confirmation that mapping is obtained is generated as and reports signaling, controls described transmission and the repeating transmission that reports signaling, and the renewal of carrying out the described TTI ACK formation and the TSN-PDU table of comparisons;

PDU sending order logging modle: be used to write down the order that RLC issues PDU, make it the sequence consensus of the PDU that receives with MAC-hs, so that the PDU itself that finds the needs in the RLC transmit queue to confirm or abandon according to the PDU number that reports signaling to comprise.

Because the present invention has made full use of the existing TTI data block confirmation of MAC-hs layer and the known PDU and the corresponding relation of TTI data block, make the affirmation message that can directly send PDU by transmitting terminal MAC-hs to RLC, the PDU that had both omitted the receiving terminal rlc layer confirms signaling, improved frequency again, quickened the slip of the PDU send window of transmitting terminal RLC the PDU data validation; Simultaneously, the PDU affirmation mechanism is moved to transmitting terminal from receiving terminal, can reduce complexity requirement, be applicable to wider mobile subscriber travelling carriage for following behavior master's HSDPA business; Because the present invention can reduce high-level signaling, therefore can improve data transmission rate and reduce to receive the transmission lag that causes, can improve the system data transmission performance, reduce the waste of channel resource.

Description of drawings

Fig. 1 is MAC-hs in the HSDPA architecture and the graph of a relation of RLC;

Fig. 2 is the embodiment flow chart of the method for the invention;

Fig. 3 is the embodiment block diagram of device of the present invention;

Specific implementation

The present invention is described in further detail below in conjunction with accompanying drawing.

Situation according to prior art, the basic thought of solution of the present invention is: transmit leg MAC-hs is according to PDU that receives and the corresponding relation between the TTI data block, with the affirmation information translation to the TTI data block that receives is the affirmation information of PDU, and directly report transmit leg RLC, transmit leg RLC issues new data confirming that PDU has been received the back and has moved sliding window rapidly.

For this reason, the invention provides the method and apparatus that promotes the quick slip of radio link control layer data transmission window.Fig. 2 is the embodiment flow chart of the method for the invention.Implement according to Fig. 2, the present invention at first creates PDU sending order record sheet at transmitting terminal RLC, be used to write down the order that RLC issues PDU, make it the sequence consensus of the PDU that receives with MAC-hs, so as according to the described number that reports the PDU in the signaling find needs confirm or abandon PDU itself.

In the step 1 of the described method of Fig. 2, PDU that transmitting terminal MAC-hs record MAC-hs receives successively and the corresponding relation between each TTI data block, the journal of transmission sequence number (TSN) of this corresponding relation being pressed TTI is in the TSN-PDU table of comparisons.And the TTI confirmation that TTI ACK formation is reported is converted to the affirmation information of pairing each PDU of this TTI TSN in the table of comparisons.

In step 2, will deposit in the described TTI ACK formation from the TTI ACK information of recipient feedback, promptly to giving the sign of " affirmation " with the queue element (QE) that this TTI has an identical TSN value.Because TTI ACK formation is tactic by TSN, so the TTI confirmation of discontinuous reception is aligned to continuous TTI confirmation in formation;

In step 3, formation is judged to described TTI ACK, and when first TTI acquisition affirmation of described TTI ACK formation, and continuous thereafter N-1 (N＞0) is when TTI all is identified, with the N value notice TSN-PDU table of comparisons;

In step 4, the TSN-PDU table of comparisons will be according to the N value of TTI ACK queue notification, and the quantity of the PDU of the top n TTI data block correspondence in the statistics table of comparisons generates the signaling that reports that comprises described PDU quantity and reports RLC;

In step 5, RLC reports the PDU number (being assumed to be M) in the signaling to search PDU sending order record according to described, and finds the sequence number of preceding M PDU, and in the PDU transmit queue corresponding PDU is confirmed sign, triggers sliding backward of send window then.

In other embodiments of the invention, above-mentioned steps 4 can also be preserved the last time and be reported signaling, judges that in order to reporting signaling bust this, error code or RLC PDU quantity resends when illegal.Step 4 can also be included in and send when reporting signaling, the described TTI ACK formation and the described TSN-PDU table of comparisons are refreshed, with the element deletion that top n in the formation and the table of comparisons has been reported, so that begin the processing of a new round from original N+1 element.

Be an example of using the method for the invention below:

The RLC PDU formation of supposing transmitting terminal is as follows, and it is to be sent to have 9 PDU, 8 PDU:PDU1 is arranged to PDU8 in the send window:

Transmitting terminal RLC is to the following record of the sending order of PDU, i.e. the order of RLC transmission PDU is the 2nd, 3,4,1,5,6,7, No. 8 PDU:

Although RLC is not continuous to the order that MAC-hs sends packet, MAC-hs only carries out internal indicator by the reception order to PDU, and promptly MAC-hs thinks that the PDU that receives is following so continuous and orderly data sequence:

p1，p2，p3，p4，p5，p6，p7，p8

Transmitting terminal MAC-hs sets up the following PDU table of comparisons according to PDU to the encapsulation mapping relations of TTI:

?PDU	??p1、p2	??p3、p4	??p5、p6、p7	????p8
					?TTI?TSN	??1	??2	??3	????4

This table of comparisons is pressed the TSN sequence arrangement of TTI, simultaneously, generates the TTIACK formation by identical order.After MAC-hs is saved in described TTI ACK formation with the TTI confirmation that receives, the theing contents are as follows of this TTI ACK formation:

TTI?TSN	?1	?2	??3	?4
					ACK	?True	?True		?True

So far, 8 PDU have finished the process that is mapped to the TTI formation from RLC PDU formation.4 TTI have obtained 3 ACK information through after a plurality of subchannel transmission.Because the head of the queue element of TTI formation is identified, thus the mapping of TTI formation triggered to the PDU table of comparisons, from TTI number N=2 that are identified continuously that first element of TTI ACK formation begins.The notified TSN-PDU table of comparisons of this numerical value.The PDU data that the TSN-PDU table of comparisons is found two the TTI correspondences in front are p1, p2, p3, p4, report signaling so generate, and the content of described signaling is " signaling type=1 (PDU that affirmation is reported), PDU number=4 ".After RLC received and reports signaling, the PDU that finds preceding 4 transmissions in PDU sending order record was PDU2, PDU3, PDU4, PDU1, then these four PDU was labeled as " successfully confirming " in original PDU formation.Move to PDU5 after triggering the sliding window of RLC forward position then, as shown below:

The content update of PDU sending order record is: 5,6,7,8.

Affirmation information among the MAC-hs report control unit with the TSN-PDU table of comparisons refresh for:

??PDU	??p5、p6、p7	????p8
			??TTI?TSN	??3	????4

Equally, TTI ACK formation is refreshed for:

??TTI?TSN	?3	?4
			??ACK		?True

Fig. 3 is the embodiment block diagram of device of the present invention.The device that promotion radio link control layer data transmission window shown in the figure slides fast comprises:

PDU formation modules A 1 among the RLC, this module comprises the PDU send window, is used to store and send PDU to be sent;

TSN-PDU table of comparisons modules A 4: be used to write down PDU that the high speed media Access Layer receives in proper order and the corresponding relation between each TTI data block, so that will receive the affirmation information that the affirmation information translation of TTI becomes PDU;

TTI ACK formation modules A 5: be used for the TTI confirmation of discontinuous reception is converted to continuous TTI confirmation, and then obtain continuous PDU confirmation, make the high speed media Access Layer that the number of the PDU that need report only need be provided when reporting PDU to confirm to RLC or abandoning information, and do not need to provide the sequence number of each PDU, report the scale of signaling with remarkable minimizing, improve the probability that at every turn reports the PDU send window that triggers RLC to slide simultaneously;

Confirmation (ACK) reports control module A3: the TTI data block confirmation that execution receives MAC-hs is saved in the operation in the TTI ACK formation module; Control TTI ACK formation is to the mapping of the TSN-PDU table of comparisons; The PDU confirmation that mapping is obtained is generated as and reports signaling, controls described transmission and the repeating transmission that reports signaling, and the renewal of carrying out the described TTI ACK formation and the TSN-PDU table of comparisons;

PDU sending order logging modle A2: be used to write down the order that RLC issues PDU, make it the sequence consensus of the PDU that receives with MAC-hs, so that the PDU itself that finds the needs in the RLC transmit queue to confirm or abandon according to the PDU number that reports signaling to comprise.

In the described module, PDU formation modules A 1 and PDU sending order logging modle A2 work in the rlc layer of data sending terminal, and ACK control module A3, TSN-PDU table of comparisons modules A 4 and TTIACK formation modules A 5 work in the MAC-hs layer of data sending terminal.

Above-mentioned module relates to following four main processes in realizing process of the present invention:

1) process of caching of TTI ACK information in the ACK formation;

2) TTI ACK is to the mapping process of PDU ACK;

3) PDU ACK information reports process;

4) RLC is slided the process that window moves to affirmation and the triggering of PDU;

The process of caching of described TTI ACK information in the ACK formation reports control module to carry out by ACK.Why wanting buffer memory TTI ACK information rather than directly it is mapped as PDU ACK to report, is because its sending order of TTI affirmation order possibility that the multichannel transmission obtains is inconsistent.The ACK formation can be converted to orderly TTI data block confirmation with unordered TTI data block confirmation with following method: the ACK formation is reserved the ACK space for each TTI data block successively by its transmission sequence number (TSN).When the ACK of certain TTI data block returns, on ACK formation relevant position, stamp the affirmation mark according to the TSN value of this TTI data block.Each ACK reports only at the TTI data block that is identified continuously that begins from the ACK head of the queue, that is: only be identified as the TTI of ACK head of the queue, and N continuous-1 (N＞0) just triggers the mapping process of TTI ACK to PDU ACK when individual TTI all is identified thereafter, and successful PDU is reported RLC.

From said process as can be known, the time interval (number of TTI data block) that each ACK reports and confirm that the number of PDU do not fix, but reporting opportunity is may trigger the earliest the moment that rlc layer PDU send window slides, because have only the affirmation of head of the queue TTI data block just can cause issuing earlier the affirmation of PDU.These PDU are most likely at the PDU that position in the rlc layer PDU send window is forward or be retransmitted, and they are to having the greatest impact that send window moves.

Described TTI ACK is carried out by TTI ACK formation module and TSN-PDU table of comparisons module to the mapping process of PDU ACK.The contrast relationship of TSN-PDU is carried out PDU packing and TBS at MAC-hs and is just determined to the branch timing of TTI.TTI ACK is triggered to being mapped under two conditions of PDU ACK, and the one, ACK head of the queue element is identified, and need report when sending successful PDU; The 2nd, overtime not being identified of ACK head of the queue element need report when being abandoned PDU.

ACK formation and TSN-PDU formation all are tactic by the TSN of TTI data block, therefore mapping relations are very simple, the ACK formation will be notified the TSN-PDU table of comparisons from the TTI number " N " that is identified continuously that head of the queue begins, the TSN-PDU table of comparisons begins to add up the PDU number of each TSN correspondence from gauge outfit, all adds up and organizes until N.These PDU are identified or by the PDU that abandoned, and be the earliest by RLC send a collection of.The quantity that is identified PDU reports control module by TSN-PDU formation module notice ACK, generates and reports signaling.

Each TTI ACK finishes to the mapping of PDU ACK, and ACK formation module and TSN-PDU table of comparisons module must be deleted the top n element, and head of the queue and gauge outfit are pointed to original N+1 positions of elements respectively.Above-mentioned is synchronous to refreshing of the ACK formation and the TSN-PDU table of comparisons, also be absolutely necessary, and be to send successful PDU quantity but not sequence number is a kind of relative information because ACK reports.

Send the situation of failure for head of the queue TTI data block, its pairing PDU will be abandoned.Refresh the ACK head of the queue and the TSN-PDU gauge outfit that finish and point to former the 2nd element respectively.Because new head of the queue element might be identified, so need carry out the mapping process of TTI ACK to PDU ACK once more.So TTI ACK formation is after once mapping is finished, its head of the queue pointer always points to next ACK headspace unconfirmed.

The process that reports of described PDU ACK information reports control module to finish by ACK.It sends to RLC with a NBAP signaling after receiving the PDU quantity of the transmission success that TSN-PDU table of comparisons module transmits.The effective content of signaling can be two parts, and a part illustrates that for the Type sign PDU that reports sends successfully or abandons; The sum of the PDU that another part mark reports.

ACK reports control module will preserve the last signaling content (comprising signaling type and PDU quantity) that reports, and prepares against when reporting signaling bust this, error code or RLC judgement PDU number illegal and retransmits.

Described RLC is slided the process that window moves to affirmation and the triggering of PDU, after RLC reception ACK reports signaling, searches PDU sending order record earlier.Suppose that reporting the PDU quantity of signaling is k, the sequence number of k PDU that sends before then in PDU sending order record, searching, and in the RLCPDU formation, these PDU are labeled as affirmation or abandon.After mark was finished, the sliding window that triggers the PDU formation moved, with confirmed PDU grand window.

Except that said process, also need generation, transmission and retransmission process that PDU reports signaling; The generation of ACK formation, the TSN-PDU table of comparisons and PDU sending order record, refresh and other maintenance process.

Claims (6)

1, a kind of radio link control layer data transmission window method of slip fast that promotes, this method comprises:

(1) corresponding relation between the set of data blocks that transmits among the PDU of transmitting terminal record high speed media Access Layer (MAC-hs) order reception and each TTI (Transmission Time Interval);

(2) transmitting terminal MAC-hs sets up a TTIACK (affirmation) formation by the order of TTI transmit Sequence Number (TSN), is used for the TTI confirmation that the buffer memory receiving terminal will feed back;

(3) the TTI confirmation that receives according to transmitting terminal MAC-hs is marked in the described TTI ACK formation;

(4) when described TTI ACK formation from first TTI data block that is identified and continuous thereafter N-1 (N＞0) when the TTI data block all is identified, add up the described TTI data block that first is identified and reach the PDU quantity that encapsulates in N-1 the continuous thereafter TTI data block, generation comprises the signaling that reports of this quantity, type code in the signaling is set to: the PDU that affirmation is reported directly reports transmitting terminal RLC by transmitting terminal MAC-hs then;

(5) when first TTI of described TTIACK formation does not obtain confirmation yet after the re-transmission through maximum permission number of times, this element is done the report processing identical with above-mentioned steps (4), but will report the type code in the signaling to change into: abandon the PDU that reported.

(6) RLC confirms and triggers its PDU send window slip according to the described signaling that reports to corresponding PDU (protocol Data Unit),, confirmed PDU is shifted out the PDU send window.

2, the quick method of sliding of radio link control layer data transmission window according to claim 1, it is characterized in that this method also comprises: create the table of comparisons between PDU and the TTI TSN (transmission sequence number), be used to write down PDU data that MAC-hs receives and the corresponding relation between each TTI data block, so that be the affirmation information of PDU with the affirmation information translation of the TTI data block that receives.

3, the quick method of sliding of radio link control layer data transmission window according to claim 1, it is characterized in that this method also comprises: create PDU transmitting sequence record sheet at RLC, be used to write down the order that RLC issues PDU, the sequence consensus of the PDU that this order receives with MAC-hs is so that find the PDU itself that successfully sends according to the described quantity of the successful PDU in the signaling that reports in the RLC transmit queue.

4, the quick method of sliding of RLC send window according to claim 1, it is characterized in that this method also comprises: the affirmation information by MAC-hs reports control unit to preserve the last signaling parameter that reports, and judges that in order to reporting signaling bust this, error code or RLC PDU quantity resends when illegal.

5, the quick method of sliding of RLC send window according to claim 1, it is characterized in that this method also comprises: after once reporting operation to finish, the described TTI ACK formation and the described TSN-PDU table of comparisons are refreshed, the top n element that is mapped as the PDU confirmation and has reported is deleted from the described formation and the described table of comparisons, so that begin to handle from original N+1 the element of the described formation and the described table of comparisons.

6, a kind of radio link control layer data transmission window device of slip fast that promotes comprises the PDU formation module among the RLC, and this module comprises the PDU send window, is used to store and send PDU to be sent; It is characterized in that described device also comprises:

TSN-PDU table of comparisons module: be used to write down PDU that the high speed media Access Layer receives in proper order and the corresponding relation between each TTI data block, so that will receive the affirmation information that the affirmation information translation of TTI becomes PDU;

TTIACK formation module: be used for the TTI confirmation of discontinuous reception is converted to continuous TTI confirmation, and then obtain continuous PDU confirmation, make the high speed media Access Layer that the number of the PDU that need report only need be provided when reporting PDU to confirm to RLC or abandoning information, and do not need to provide the sequence number of each PDU, report the scale of signaling with remarkable minimizing, improve the probability that at every turn reports the PDU send window that triggers RLC to slide simultaneously;

Confirmation (ACK) reports control module: the TTI data block confirmation that execution receives MAC-hs is saved in the operation in the TTI ACK formation module; Control TTI ACK formation is to the mapping of the TSN-PDU table of comparisons; The PDU confirmation that mapping is obtained is generated as and reports signaling, controls described transmission and the repeating transmission that reports signaling, and the renewal of carrying out the described TTI ACK formation and the TSN-PDU table of comparisons;

PDU sending order logging modle: be used to write down the order that RLC issues PDU, make it the sequence consensus of the PDU that receives with MAC-hs, so that the PDU itself that finds the needs in the RLC transmit queue to confirm or abandon according to the PDU number that reports signaling to comprise.

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