CN101883390A - Method for managing service data unit (SDU) for radio link control (RLC) layer and system thereof - Google Patents
Method for managing service data unit (SDU) for radio link control (RLC) layer and system thereof Download PDFInfo
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Abstract
The invention provides a method for managing a service data unit (SDU) for a radio link control (RLC) layer and a system thereof. The method comprises the following steps of: creating a receiving queue for an RLC entity corresponding to user equipment (UE) and receiving time information for each SDU received by the RLC entity and interpolating the SDU and corresponding receiving time information to the receiving queue according to the receiving sequence of the SDU; acquiring the receiving time information of the SDU positioned at the head of the receiving queue, calculating the saving time of the SDU in the receiving queue according to the current time and comparing whether the saving time exceeds a preset value; if the saving time exceeds the preset value, discarding the SDU at the head of the receiving queue; and if the saving time does not exceed the preset value, saving all SDUs in the receiving queue. The SDU management method for the radio link control layer of the invention can simplify the overtime judgment of each SDU in the RLC entity, reduce the occupying of communication system resources and improve the processing efficiency.
Description
Technical field
The present invention relates to a kind of SDU management method of wireless chain control layer, also relate to a kind of SDU management system of wireless chain control layer.
Background technology
In the 3G cdma system, core net (CN) business all is mapped to a RAB (RAB), and each RAB is mapped to one or more radio bearers (RB) of the side of eating dishes without rice or wine.Protocol stack in the side of eating dishes without rice or wine is divided into three layers: physical layer, radio link layer and radio resource control layer.Wherein, the effect of described radio link layer is to guarantee data transmission effectively reliably, and described radio link layer comprises control sub layer of wireless link (RLC), Media Access Control (MAC) and packet data protocol convergence sublayer (PDCP) etc.
When certain core net service access, radio resource control layer (RRC) is mapped to the core net business RB business of the side of eating dishes without rice or wine, and set up one or more RLC entities for these business in the RLC sublayer, all corresponding RB of each described RLC entity in addition, each described RLC entity independently carries out the processing of data, does not interfere each other.The corresponding a kind of transmission mode of each described RLC entity, in described RLC sublayer, have the transmission mode of three kinds: transparent transmission pattern (TM), non-affirmation transmission mode (UM) and affirmation transmission mode (AM), after a described RLC entity was set up by described rrc layer, its corresponding transmission mode also just had been fixed.The transmission mode type of a described RLC entity is by its pairing service attribute decision, the described RLC entity that generally has the real time business attribute uses transparent transmission pattern (TM) and non-affirmation transmission mode (UM), and the described RLC entity with non-real-time service attribute uses confirms transmission mode (AM).
For (UE side up of the transmitting terminal of RLC entity, UTRAN side descending), the function of described RLC entity is exactly that the Service Data Unit (SDU) that the upper strata sends over is carried out the segmentation cascade, and add that corresponding RLC capitiform becomes RLC PDU (Protocol Data Unit, protocol Data Unit); For the receiving terminal of RLC entity (UE side descending, UTRAN side up), the function of described RLC entity is exactly that the RLC PDU that lower floor sends over is reassembled into RLC SDU, and sends to high level.
Whether described RLC entity needs received SDU is carried out overtime discard processing, depends on the SDU processing mode that described rrc layer is disposed described RLC entity.When having only described rrc layer to become SDU based on timer to abandon mode to described RLC physical arrangements, described RLC entity carries out just that SDU is overtime to abandon operation.For the described RLC entity that is configured to based on timer, dispose the holding time of each described SDU by described rrc layer, after described RLC entity is received the SDU that high level issues,, then abandon overtime described SDU in the above-mentioned holding time if described SDU does not successfully send.For the RLC entity that is configured to TM or UM, abandon after the overtime described SDU, do not need receiving terminal report to described SDU; For the RLC entity that is configured to AM, need send signaling informing that described SDU receiving terminal is which SDU has been dropped to the receiving terminal of described SDU, and then abandon overtime described SDU.
According to the 3GPP WAP (wireless access protocol), if described rrc layer has disposed described RLC entity and has abandoned mode for the SDU based on timer, then described RLC entity need be opened a timer for each described SDU that receives according to the fixedly duration of high level configuration, if described timer expiry, and corresponding described SDU does not successfully send, and then abandons overtime described SDU.If set up a plurality of described RLC entities in the communication system, these RLC entities all are configured to abandon mode based on the SDU of timer, and each described RLC entity carries a plurality of described SDU simultaneously in the holding time that described timer is set, then owing to will all open a timer for each described SDU, so the number of the timer of opening in the communication system can become a lot, this is particularly evident in base station side.Because the processor resource of communication system is limited, and the timer of opening is many more, and the resource that takies communication system is big more, along with the timer number of opening is more and more, the performance of whole communication system all will worsen, and can occur the phenomenon of Communication Systems Processor resource exhaustion when serious.
Summary of the invention
For the SDU management method of the wireless chain control layer that solves prior art takies the more technical problem of processor resource of communication system, the invention provides the SDU management method that a kind of processor resource to communication system takies less wireless chain control layer.
A kind of SDU management method of wireless chain control layer, comprise step: the RLC entity set-up to a UE correspondence receives formation, each SDU that described RLC entity is received creates the information time of reception, and the sequencing that receives according to described SDU is inserted into described reception formation with described SDU and the corresponding information time of reception; Obtain described time of reception of the information of the SDU that is positioned at head of the queue in the described reception formation, according to the holding time of the described SDU of the described information calculations time of reception in described reception formation, and the more described holding time whether surpass preset value; If the described holding time surpasses described preset value, then abandon the described SDU of head of the queue; If the described holding time does not surpass described preset value, then keep the SDU in the whole of said received formation.
Compared with prior art, in the SDU management method of wireless chain control layer of the present invention, RLC entity set-up to a UE correspondence receives formation, and described SDU and the corresponding information time of reception are inserted into described reception formation according to the sequencing that described SDU receives, if judge whether each described SDU of described RLC entity reception is overtime, then only need judge whether the described SDU that is in head of the queue in the described reception formation is overtime,, then abandon the described SDU of head of the queue if overtime; If not overtime, then keep the SDU in the whole of said received formation.Therefore, the SDU management method of wireless chain control layer of the present invention can be simplified the overtime judgement to the described SDU in each described RLC entity, and minimizing takies the Communication Systems Processor resource, reduces the time that described SDU is handled, and improves treatment effeciency.
For the SDU management system of the wireless chain control layer that solves prior art takies the more technical problem of processor resource of communication system, the invention provides the SDU management system that a kind of processor resource to communication system takies less wireless chain control layer.
A kind of SDU management system of wireless chain control layer comprises receiver module, processing module and Executive Module.Described receiver module is used for the RLC entity set-up of a UE correspondence is received formation, each SDU that described RLC entity is received creates the information time of reception, and the sequencing that receives according to described SDU is inserted into described reception formation with described SDU and the corresponding information time of reception.Described processing module is used for obtaining described time of reception of the information of SDU that described reception formation is positioned at head of the queue, according to the holding time of the described SDU of the described information calculations time of reception in described reception formation, and the more described holding time whether surpass preset value.Described Executive Module is used for abandoning the described SDU of head of the queue when the described holding time surpasses described preset value; When the described holding time does not surpass described preset value, keep the SDU in the whole of said received formation.
Compared with prior art, in the SDU management system of wireless chain control layer of the present invention, described receiver module receives formation to the RLC entity set-up of a UE correspondence, and according to the sequencing that described SDU receives described SDU and the corresponding information time of reception is inserted into described reception formation.Then described processing module only need judge whether the described SDU that is in head of the queue in the described reception formation is overtime, if overtime, then notifies described Executive Module to abandon the described SDU of head of the queue; If not overtime, then notify the SDU in the formation of described Executive Module reservation whole of said received.Therefore, the SDU management system of wireless chain control layer of the present invention can be simplified the overtime judgement to the described SDU in each described RLC entity, and minimizing takies the Communication Systems Processor resource, reduces the time that described SDU is handled, and improves treatment effeciency.
Description of drawings
Fig. 1 is to the reception handling process schematic diagram of SDU in the SDU management method of wireless chain control layer of the present invention;
Fig. 2 abandons the judgement schematic flow sheet to SDU in the SDU management method of wireless chain control layer of the present invention;
Fig. 3 is the structural representation of the SDU management system of wireless chain control layer of the present invention.
Wherein, the SDU management system of 30 wireless chain control layers;
31 receiver modules;
33 processing modules;
35 Executive Modules.
Embodiment
The SDU management method of wireless chain control layer of the present invention comprises judges two parts of flow process to abandoning of the described SDU of the reception handling process of SDU and preservation.
See also Fig. 1, Fig. 1 is to the reception handling process schematic diagram of SDU in the SDU management method of wireless chain control layer of the present invention.
Described reception handling process following steps to SDU:
S101 is to the RLC entity set-up reception formation of a UE correspondence;
When UE sets up business first, described rrc layer is set up contextual information for described UE in described rlc layer, described contextual information comprises information such as UE ID, described rrc layer is mapped to the core net business RB business of the side of eating dishes without rice or wine simultaneously, and sets up one or more RLC entities at rlc layer for these business.Each described RLC entity receives the SDU that is sent to described rlc layer, then described SDU is sent to the receiving terminal of SDU.In the present embodiment, can store the configuration information of described RLC entity according to RB ID order from small to large successively, whether described configuration information comprises the overtime SDU of abandoning, and described RLC entity is carried out which kind of transmission mode etc.
When described RLC entity activates, described RLC entity set-up reception formation for each activation, described reception formation is set at the formation of first in first out, and the SDU that promptly is positioned at head of the queue at first sends, and the SDU that is positioned at tail of the queue sends after other SDU of described reception formation send again.
S103, each SDU that described RLC entity is received creates the information time of reception;
When a described RLC entity receives SDU, the described SDU that receives is created the information time of reception, described time of reception, information should be created based on unified reference clock.As a kind of execution mode, for each described UE sets a clock count value and the clock loop count reference clock as described UE.Wherein, the clock count value of described UE and the SFN of communication system (system-frame number) are synchronous, circulate in default number range, for example described clock count value is initially set 1, the every 5ms of described clock count value adds 1, and reaches at 4095 o'clock at numerical value and become 1 again, finishes once circulation; It is zero that described clock loop count can be arranged to initial value, the every circulation primary of the value of described clock count value, and described clock loop count adds 1.Creating described time of reception during information, can be according to the size of described clock count value and described clock loop count, calculate the relative moment when receiving described SDU, will bind in the described relative moment then with the form of data and corresponding described SDU.
Except that described clock count value and described clock loop count are set, the reference clock of a timer as described UE can also be set, perhaps set the reference clock of described UE by other known modes.
S105, the sequencing that receives according to described SDU is inserted into described reception formation with described SDU and the corresponding information time of reception;
When described RLC entity receives a described SDU, and with described SDU the time of reception information with described SDU binding after, described time of reception of the information of described SDU and correspondence is inserted into together the tail of the queue of described reception formation.Receiving next SDU and binding corresponding described time of reception after the information then, with described SDU and corresponding described time of reception information be inserted into the tail of the queue of the described reception formation of current time.Constantly repeat aforesaid operations, with described SDU and corresponding described time of reception information be inserted into described reception formation one by one according to the sequencing that described SDU receives.
See also Fig. 2, Fig. 2 abandons the judgement schematic flow sheet to SDU in the SDU management method of wireless chain control layer of the present invention.
Described abandoning of SDU judged the flow process following steps:
S202 obtains described time of reception of the information of the SDU that is positioned at head of the queue in the described reception formation;
According to the principle of first in first out, the described SDU that is positioned at head of the queue in the described reception formation promptly is the SDU that receives the earliest.From described reception formation, extract described time of reception of the information of the described SDU be positioned at head of the queue.
S204 is according to the holding time of the described SDU of the described information calculations time of reception in described reception formation;
According to described reference clock, can calculate current relative time equally, described clock count value of for example setting among the obtaining step S103 and described clock loop count are in the value of current time, can calculate the described current time, according to obtain among described current time and the step S202 described time of reception information difference, can calculate the holding time of the described SDU of the head of the queue that is arranged in described reception formation in described reception formation.
S206, whether the more described holding time surpasses preset value;
Described preset value is the maximum duration that SDU can keep in described rlc layer, can specifically set according to the parameter needs of communication system.
S208 if the described holding time surpasses described preset value, then abandons the described SDU of head of the queue;
If the described holding time surpasses described preset value, show that then the described holding time of the described SDU of the head of the queue that is arranged in described reception formation surpasses the maximum duration that SDU can keep at described rlc layer, should abandon.
In this step, abandon before the described SDU of head of the queue, can judge the transmission mode of described RLC entity earlier, if described RLC entity is set at the affirmation transmission mode, then send abandoning of described SDU and confirm report to the SDU receiving terminal, after receiving the affirmation information of described SDU receiving terminal, abandon the described SDU of head of the queue; If described RLC entity is set at transparent transmission pattern or non-affirmation transmission mode, then directly abandon the described SDU of head of the queue.The described affirmation report that abandons that sends to the SDU receiving terminal is preferably the PDU that comprises MRW SUFI (the super territory of mobile receiver window) state, also can be other forms of signal.
At execution in step S208, abandon after the described SDU of head of the queue, get back to step S202, continue to judge whether the holding time of next described SDU in the described reception formation (being the described SDU that current time is positioned at described reception formation head of the queue) surpasses described preset value, be then to abandon described SDU, the holding time that is in the described SDU of head of the queue in described reception formation turns to step S210 till being no more than described preset value.
S210 if the described holding time does not surpass described preset value, then keeps the SDU in the whole of said received formation.
Because described reception formation is first in first out, each described SDU is inserted into described reception formation according to the sequencing that described SDU receives in step S105, therefore, if it is not overtime to be positioned at the described SDU of head of the queue, other the described SDU that then is arranged in described reception formation can be not overtime yet, so keep the SDU in the whole of said received formation.
After step S210, promptly finished the SDU management of one of them described RLC entity of described UE correspondence, therefore begin after the step S210 another described RLC entity of described UE correspondence is carried out the SDU management, promptly to another described RLC entity execution in step S202 to S210.In the present embodiment can () order perhaps from big to small, perhaps other default orders be handled the reception formation in each described RLC entity of described UE correspondence successively from small to large according to the RB ID value of each described RLC entity correspondence.When in the described reception formation of each described RLC entity of described UE correspondence, not having SDU (all send or abandon), discharge each described RLC entity of described UE correspondence, discharge the contextual information of described UE, and the reference clock of described UE is made zero.
Compared with prior art, in the SDU management method of wireless chain control layer of the present invention, RLC entity set-up to a UE correspondence receives formation, and described SDU and the corresponding information time of reception are inserted into described reception formation according to the sequencing that described SDU receives, if judge whether each described SDU of described RLC entity reception is overtime, then only need judge whether the described SDU that is positioned at head of the queue in the described reception formation is overtime,, then abandon the described SDU of head of the queue if overtime; If not overtime, then keep the SDU in the whole of said received formation.Therefore, the SDU management method of wireless chain control layer of the present invention can be simplified the overtime judgement to the described SDU in each described RLC entity, and minimizing takies the Communication Systems Processor resource, reduces the time that described SDU is handled, and improves treatment effeciency.
In the SDU management method of wireless chain control layer of the present invention, preferably, before execution in step S202, can judge earlier whether described RLC entity supports overtime abandoning to the management of SDU, if described RLC entity is not abandon to the way to manage of SDU, perhaps maximum retransmit abandons mode, then can be not to described RLC entity execution in step S202 to S210, if described RLC entity is supported overtime abandoning to the way to manage of SDU, then to described RLC entity execution in step S202 to S210.
The SDU management method of wireless chain control layer of the present invention goes for the communication system of TDD or FDD standard; those skilled in the art can change concrete parameter setting according to design of the present invention, do not constitute the qualification to protection range of the present invention.
See also Fig. 3, Fig. 3 is the structural representation of the SDU management system of wireless chain control layer of the present invention.The SDU management system 30 of described wireless chain control layer comprises: receiver module 31, processing module 33 and Executive Module 35.
Described receiver module 31 is used for the RLC entity set-up of a UE correspondence is received formation, each SDU that described RLC entity is received creates the information time of reception, and the sequencing that receives according to described SDU is inserted into described reception formation with described SDU and the corresponding information time of reception.
In the present embodiment, described receiver module 31 stores the configuration information of described RLC entity successively according to RB ID order from small to large, and whether described configuration information comprises the overtime SDU of abandoning, and described RLC entity is carried out which kind of transmission mode etc.
When described RLC entity activates, described receiver module 31 is that the described RLC entity set-up of each activation receives formation, described reception formation is set at the formation of first in first out, the SDU that promptly is positioned at head of the queue at first sends, and the SDU that is positioned at tail of the queue sends after other SDU of described reception formation send again.
When a described RLC entity received SDU, the SDU of 31 pairs of described receptions of described receiver module created described time of reception of information, and described time of reception, information should be created based on unified reference clock.As a kind of execution mode, described receiver module 31 is that each described UE sets a clock count value and the clock loop count reference clock as described UE.Wherein, the clock count value of described UE and the SFN value of communication system are synchronous, circulate in default number range, for example described clock count value is initially set 1, the every 5ms of described clock count value adds 1, and reaches at 4095 o'clock at numerical value and become 1 again, finishes once circulation; Described clock loop count is initially set to zero, the every circulation primary of the value of described clock count value, and described clock loop count adds 1.Described receiver module 31 is when the establishment described time of reception of information, can be according to the size of described clock count value and described clock loop count, in the relative moment when calculate receiving described SDU, will bind in the described relative moment then with the form of data and corresponding described SDU.
Except that described clock count value and described clock loop count were set, described receiver module 31 can also be provided with the reference clock of a timer as described UE, perhaps set the reference clock of described UE by other known modes.
When described RLC entity receives a SDU, described receiver module 31 with described SDU the time of reception information with described SDU binding after, described time of reception of the information of described SDU and correspondence is inserted into together the tail of the queue of described reception formation.Described then receiver module 31 is receiving next SDU and binding corresponding described time of reception after the information once more, with described SDU and corresponding described time of reception information be inserted into the tail of the queue of the described reception formation of current time.Described receiver module 31 constantly repeats aforesaid operations, with described SDU and corresponding described time of reception information be inserted into described reception formation one by one according to the sequencing that described SDU receives.
Described processing module 33 is used for obtaining described time of reception of the information of SDU that described reception formation is positioned at head of the queue, according to the holding time of the described SDU of the described information calculations time of reception in described reception formation, and whether the more described holding time is above preset value.
Described processing module 33 is positioned at described time of reception of SDU of head of the queue after the information in obtaining described reception formation, according to described reference clock, described processing module 33 can calculate current relative time equally, the value of the current time of described clock count value of setting according to described receiver module 31 and described clock loop count for example, described processing module 33 can calculate the described current time.Described processing module 33 again according to the described current time and described time of reception information difference, can calculate the described SDU that is arranged in described reception formation head of the queue holding time in described reception formation.
Whether the described then 33 more described holding times of processing module surpass preset value, and notify described Executive Module 35 with described comparative result.Wherein, described preset value is the maximum duration that SDU can keep in described rlc layer, can specifically set according to the parameter needs of communication system.
Described Executive Module 35 is used for abandoning the described SDU of head of the queue when the described holding time surpasses described preset value; When the described holding time does not surpass described preset value, keep the SDU in the whole of said received formation.
If the described holding time surpasses described preset value, the described holding time that then shows the described SDU of the head of the queue that is arranged in described reception formation surpasses the maximum duration that SDU can keep at described rlc layer, should abandon, abandon operation so described Executive Module 35 is carried out.
Described Executive Module 35 is before abandoning the described SDU of head of the queue, can judge the transmission mode of described RLC entity earlier, if described RLC entity is set at the affirmation transmission mode, then described Executive Module 35 sends abandoning of described SDU to the SDU receiving terminal earlier and confirms report, after receiving the affirmation information of described SDU receiving terminal, abandon the described SDU of head of the queue again; If described RLC entity is set at transparent transmission pattern or non-affirmation transmission mode, then described Executive Module 35 directly abandons the described SDU of head of the queue.Described Executive Module 35 is preferably the PDU that comprises MRW SUFI state to the affirmation report that abandons that the SDU receiving terminal sends, and also can be other forms of signal.
Described Executive Module 35 abandons after the described SDU of head of the queue, whether the holding time that can continue to judge next described SDU in the described reception formation (being the described SDU that current time is positioned at described reception formation head of the queue) surpasses described preset value, be then to abandon described SDU, till the holding time that is in the described SDU of head of the queue in described reception formation is no more than described preset value.
Because described reception formation is first in first out, each described SDU is inserted into described reception formation by described receiver module 31 according to the sequencing that described SDU receives, therefore, if it is not overtime to be positioned at the described SDU of head of the queue, other the described SDU that then is arranged in described reception formation can be not overtime yet, and described Executive Module 35 will keep the SDU in the whole of said received formation.
After the SDU that described Executive Module 35 keeps in the whole of said received formation, promptly finished the SDU management to one of them described RLC entity of described UE correspondence, therefore described Executive Module 35 begins another described RLC entity of described UE correspondence carried out the SDU management.In the present embodiment, described processing module 33 and described Executive Module 35 can be according to the RB ID value of described RLC entity correspondence () orders perhaps from big to small from small to large, perhaps other default orders are handled the reception formation in each described RLC entity of described UE correspondence successively.When in the described reception formation of each described RLC entity of described UE correspondence, not having SDU (all send or abandon), described Executive Module 35 discharges each described RLC entity of described UE correspondence, discharge the contextual information of described UE, and the reference clock of described UE is made zero.
Compared with prior art, in the SDU management system of wireless chain control layer of the present invention, described receiver module receives formation to the RLC entity set-up of a UE correspondence, and according to the sequencing that described SDU receives described SDU and the corresponding information time of reception is inserted into described reception formation.Then described processing module only need judge whether the described SDU that is in head of the queue in the described reception formation is overtime, if overtime, then notifies described Executive Module to abandon the described SDU of head of the queue; If not overtime, then notify the SDU in the formation of described Executive Module reservation whole of said received.Therefore, the SDU management system of wireless chain control layer of the present invention can be simplified the overtime judgement to the described SDU in each described RLC entity, and minimizing takies the Communication Systems Processor resource, reduces the time that described SDU is handled, and improves treatment effeciency.
In the SDU management system of wireless chain control layer of the present invention, preferably, described processing module 33 is before handling a RLC entity, can judge earlier whether described RLC entity supports overtime abandoning to the management of SDU, if described RLC entity is not abandon to the way to manage of SDU, perhaps maximum retransmit abandons mode, and then described processing module 33 and described Executive Module 35 need not described RLC entity is carried out the SDU management of wireless chain control layer of the present invention; If described RLC entity is supported overtime abandoning to the way to manage of SDU, then described processing module 33 and described Executive Module 35 are just carried out the SDU management to described RLC entity.
The SDU management system 30 of wireless chain control layer of the present invention goes for the communication system of TDD or FDD standard equally.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (16)
1. the SDU management method of a wireless chain control layer is characterized in that comprising step:
RLC entity set-up to a UE correspondence receives formation, and each SDU that described RLC entity is received creates the information time of reception, and the sequencing that receives according to described SDU is inserted into described reception formation with described SDU and the corresponding information time of reception;
Obtain described time of reception of the information of the SDU that is positioned at head of the queue in the described reception formation, according to the holding time of the described SDU of the described information calculations time of reception in described reception formation, and the more described holding time whether surpass preset value;
If the described holding time surpasses described preset value, then abandon the described SDU of head of the queue; If the described holding time does not surpass described preset value, then keep the SDU in the whole of said received formation.
2. the SDU management method of wireless chain control layer as claimed in claim 1 is characterized in that, abandons after the described SDU of head of the queue, continues to carry out following steps:
Whether the holding time of judging next described SDU in the described reception formation surpasses described preset value, is then to abandon described SDU, till the holding time that is positioned at the described SDU of head of the queue in described reception formation is no more than described preset value.
3. as the SDU management method of claim 1 or 2 described wireless chain control layers, it is characterized in that the step that each SDU that described RLC entity is received creates the information time of reception comprises:
For each described UE sets clock count value and clock loop count, create the information time of reception of described SDU according to described clock count value and described clock loop count, wherein, the clock count value of described UE and the SFN value of communication system are synchronous, in default number range, circulate, the every circulation primary of described clock count value, described clock loop count adds 1.
4. as the SDU management method of claim 1 or 2 described wireless chain control layers, it is characterized in that the step that each SDU that described RLC entity is received creates the information time of reception comprises:
For each described UE is provided with the reference clock of a timer as described UE, create the information time of reception of described SDU according to described timer.
5. as the SDU management method of claim 1 or 2 described wireless chain control layers, it is characterized in that: according to the size order of the RB ID value of each described RLC entity correspondence, each the described RLC entity to described UE correspondence carries out the SDU management successively.
6. as the SDU management method of claim 1 or 2 described wireless chain control layers, it is characterized in that the step that abandons the described SDU of head of the queue comprises:
Judge the transmission mode that described RLC entity is supported, if described RLC entity is set at the affirmation transmission mode, then send abandoning of described SDU and confirm report to the SDU receiving terminal, after receiving the affirmation information of described SDU receiving terminal, abandon the described SDU of head of the queue, if described RLC entity is set at transparent transmission pattern or non-affirmation transmission mode, then directly abandon the described SDU of head of the queue.
7. as the SDU management method of claim 1 or 2 described wireless chain control layers, it is characterized in that: after abandoning the described SDU of head of the queue, if do not have SDU in the described reception formation of each of described UE correspondence, then discharge the contextual information of described UE, and each the described RLC entity that discharges described UE correspondence.
8. as the SDU management method of claim 1 or 2 described wireless chain control layers, it is characterized in that, execution obtain the SDU that is positioned at head of the queue in the described reception formation described time of reception information step before, carry out following steps earlier:
Judge whether described RLC entity supports overtime abandoning to the management of SDU, if judge overtime the abandoning of support, the step after then carrying out is successively carried out overtime judgement to described SDU; If judge and do not support overtime abandoning, then described SDU is not carried out overtime judgement.
9. the SDU management system of a wireless chain control layer is characterized in that comprising:
Receiver module, be used for the RLC entity set-up of a UE correspondence is received formation, each SDU that described RLC entity is received creates the information time of reception, and the sequencing that receives according to described SDU is inserted into described reception formation with described SDU and the corresponding information time of reception;
Processing module is used for obtaining described time of reception of the information of SDU that described reception formation is positioned at head of the queue, according to the holding time of the described SDU of the described information calculations time of reception in described reception formation, and the more described holding time whether surpass preset value;
Executive Module is used for abandoning the described SDU of head of the queue when the described holding time surpasses described preset value; When the described holding time does not surpass described preset value, keep the SDU in the whole of said received formation.
10. the SDU management system of wireless chain control layer as claimed in claim 9, it is characterized in that: described Executive Module is after abandoning the described SDU of head of the queue, continue to judge whether the holding time of next described SDU in the described reception formation surpasses described preset value, be then to abandon described SDU, till the holding time that is in the described SDU of head of the queue in described reception formation is no more than described preset value.
11. the SDU management system as claim 9 or 10 described wireless chain control layers is characterized in that:
Described receiver module is that each described UE sets clock count value and clock loop count, and create the information time of reception of described SDU according to described clock count value and described clock loop count, wherein, the clock count value of described UE and the SFN value of communication system are synchronous, in default number range, circulate, the every circulation primary of described clock count value, described clock loop count adds 1.
12. SDU management system as claim 9 or 10 described wireless chain control layers, it is characterized in that: the reference clock of a timer as described UE is set in the described receiver module, and described receiver module is created the information time of reception of described SDU according to described timer.
13. the SDU management system as claim 9 or 10 described wireless chain control layers is characterized in that:
Described Executive Module is judged the transmission mode that described RLC entity is supported, if described RLC entity is set at the affirmation transmission mode, then described Executive Module sends abandoning of described SDU to the SDU receiving terminal and confirms report, and after receiving the affirmation information of described SDU receiving terminal, abandon the described SDU of head of the queue, if described RLC entity is set at transparent transmission pattern or non-affirmation transmission mode, then described Executive Module directly abandons the described SDU of head of the queue.
14. the SDU management system as claim 9 or 10 described wireless chain control layers is characterized in that:
Described processing module is according to the size order of the RB ID value of described RLC entity correspondence, handles the reception formation in each described RLC entity of described UE correspondence successively.
15. the SDU management system as claim 9 or 10 described wireless chain control layers is characterized in that:
Described Executive Module if judge in each described reception formation of described UE correspondence and do not have SDU, then discharges the contextual information of described UE after abandoning the described SDU of head of the queue, and each the described RLC entity that discharges described UE correspondence.
16. the SDU management system as claim 9 or 10 described wireless chain control layers is characterized in that:
Described processing module is positioned at described time of reception of SDU of head of the queue before the information in obtaining described reception formation, earlier judge whether described RLC entity supports overtime abandoning to the management of SDU, if judge and support overtime abandoning, the step after then carrying out is successively carried out overtime judgement to described SDU; If judge and do not support overtime abandoning, then described SDU is not carried out overtime judgement.
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