CN100433611C - A method for scheduling state report request data unit - Google Patents
A method for scheduling state report request data unit Download PDFInfo
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- CN100433611C CN100433611C CNB2004100089384A CN200410008938A CN100433611C CN 100433611 C CN100433611 C CN 100433611C CN B2004100089384 A CNB2004100089384 A CN B2004100089384A CN 200410008938 A CN200410008938 A CN 200410008938A CN 100433611 C CN100433611 C CN 100433611C
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Abstract
The present invention discloses a method for scheduling a state report request data unit in a communication system. The method comprises the following steps: A. a transmitting state report request is determined by a transmitter; B. the transmitter selects a data unit whose transmitting times are smaller than that preset max transmitting times in a transmitting buffer zone; C. the transmitter sets a state report request message in the selected data unit and transmits the data unit to a receiver. When the present invention is used, a receiver can feeds a state report in time to a data unit transmitted by a transmitter, great transmitting time delay is avoided, and the loss rate of a data unit is reduced.
Description
Technical field
The present invention relates in the communication system to the dispatching method of data unit the method for particularly a kind of communication system dispatch state report request msg unit.
Background technology
(Universal Mobile Telecommunications System is the 3-G (Generation Three mobile communication system) that adopts Wideband Code Division Multiple Access (WCDMA) (WCDMA) air interface technologies UMTS) to universal mobile telecommunications system, also it is called the WCDMA system usually.The UMTS system has adopted and the similar structure of second generation mobile communication system, comprise Radio Access Network (Radio Access Network, RAN) and core network (Core Network, CN).Wherein Radio Access Network is handled all and wireless function associated, and CN handles that all voice calls are connected with data in the UMTS system, and the exchange of realization and external network and routing function.CN from be divided in logic circuit commutative field (Circuit SwitchedDomain, CS) and packet-switched domain (Packet Switched Domain, PS).(User Equipment UE) has constituted whole UMTS system together for UTRAN (terrestrial access network of UMTS), CN and subscriber equipment.
Wherein, the protocol architecture of WCDMA wave point as shown in Figure 1, Fig. 1 is the protocol architecture schematic diagram of wave point, it is divided into physical layer, data link layer, network layer.Physical layer is called layer one (L1) again; Data link layer is called layer two (L2) again, comprises medium access control (MAC) sublayer, Radio Link control (RLC) sublayer, packet data compression protocol (PDCP) sublayer and broadcast/multi broadcast control (BMC) sublayer; Network layer is called layer three (L3) again, comprises Radio Resource control (RRC) sublayer.
Physical layer is connected with the media access control sublayer of L2 and the RRC sublayer of L3 by Service Access point SAPs, provides different transmission channel to the MAC layer, and the MAC layer provides service by the Different Logic channel to high level.Transmission channel characteristic is described by transmission channel physical characteristic on the wave point; The logic channel characteristic is by the dissimilar descriptions of message transfer; Physical channel characteristics is determined by sign indicating number territory, frequency domain in frequency division multiplexing (FDD) standard.
The RLC of data link layer supports three kinds of transmission modes: transparent mode (TM), Unacknowledged Mode (UM), affirmation mode (AM), realize functions such as segmentation, cascade, filling, reorganization, error control, flow control, repeatability detection.Wherein, the AM pattern has automatic repeat request (ARQ) mechanism, and RLC AM pattern can adopt sliding window protocol.
The ARQ mechanism of AM pattern comprises two peer-entities: the sending entity of RLC AM and receiving entity, sending entity are used for scheduling and send data cell; Receiving entity is responsible for status report to sending entity, the reception situation of report data unit, comprise positive acknowledgement or Negative Acknowledgement in the status report at the received data unit, positive acknowledgement represents that the corresponding data unit is correctly received, and Negative Acknowledgement is represented corresponding data unit mistake or lost.One of mechanism that triggers the receiving entity status report is to send query requests by sending entity, this query requests requires the receiving entity status report, be to realize by the poll bits territory that data cell is set, this data cell that is used for the solicited status report can be called as status report request msg unit.
The specific implementation process is referring to Fig. 2, and Fig. 2 is the operation principle schematic diagram of RLC AM functional entity model.Its course of work comprises:
The sending entity of RLC AM receives the high-rise protocol Data Unit of sending (PDU); The RLC Service Data Unit of being received (SDU) is carried out segmentation/cascade handle, also may fill processing; Assemble the PDU of acknowledged mode data (AMD) then, the border that Length Indication (LI) territory defines SDU in the AMD PDU is set; Simultaneously, the AMD PDU that retransmits according to self current store status report buffer memory needs of re-transmission buffer; Transmission buffer is dispatched the AMD PDU of new assembling and the AMD PDU that will retransmit; If the PDU that is dispatched to allows to send, then the rule according to the high level configuration is provided with poll bits, if new AMD PDU also will be provided with sequence number (SN) territory, afterwards the AMD PDU that is dispatched to is encrypted, and submits to bottom and sends.
The receiving entity of RLC AM is decrypted the AMD PDU that correctly receives, and is put into to receive in the buffering area; Receiving entity judges whether the needs status report according to the value of poll bits among the status report trigger mechanism of high level configuration and the AMD PDU, sends if desired, and then the assembled state report sends to bottom; Judge the AMD PDU the parse RLC SDU that can recombinate out then, if the RLC SDU that can recombinate out complete, the operation of then recombinating, and the PDU after will assembling is submitted to high level.
The sliding window of RLC as shown in Figure 3.Fig. 3 is a RLC sliding window schematic diagram.In RLC AM mode data transmitting-receiving process, send window and receive window are also done corresponding variation.The value from 0 to 4095 of state variable VT (A), VT (S), VT (MS), VR (R), VR (H), VR (MR).VT (A) is the send window size to the distance of VT (MS), and unit is an AMD PDU number; VR (R) is the size of receive window to the distance of VR (MR), and unit is an AMD PDU number.VT (A) is the AMD PDU that confirms in order before, VT (A) between the VT (S) for having sent at least once but also do not receive the AMD PDU of correct confirmation of receipt status report, VT (S) between the VT (MS) for allowing the AMD PDU of transmission; VR (R) is the AMDPDU for correctly having received in order before, and VR (H) is to the AMD PDU for allowing to receive between the VR (MR).
At transmitting terminal, when new AMD PDU sent, VT (S) moved backward, was that the AMD PDU of VT (A) has correctly been received when status report shows sequence number, and then VT (A) does corresponding moving.At receiving terminal, when the AMD PDU that receives between VR (H) and the VR (MR), VR (H) moves backward; When receiving sequence number when being the AMD PDU of VR (R), VR (R) moves backward.
From above sliding window mechanism, can see, the RLC sending entity receives the AMD PDU that just can retransmit mistake or lose behind the status report (Status Report) of RLC receiving entity transmission, and mobile VT (A), so the status report trigger mechanism of RLC has a significant impact the RLC performance, simultaneously, in order to adapt to different business and wireless environment, current agreement has been stipulated the trigger mechanism of multiple Status Report.These mechanism can be divided into that receiving entity initiatively triggers and trigger two classes according to the query requests of sending entity, have tens relevant parameters to need optionally configuration.Have only the trigger mechanism of appropriate configuration StatusReport could guarantee the performance of rlc protocol, if mis-arrange can cause decreased performance such as RLC throughput, time delay, even deadlock.So-called deadlock just is meant: window is full or because VT (S) back free of data, can't trigger the transmission of status report and causes VT (A) to move.
(Polling) mechanism-Poll Timer mechanism that detects in turn of sending entity, be at present for fear of deadlock a kind of status report trigger mechanism commonly used, its principle is: when the AMDPDU that includes poll bits is sent to bottom, sending entity starts timer Timer_Poll, when satisfying criterion: all sequences number subtracts 1 AMD PDU all by the affirmation of certainty smaller or equal to state variable VT (S) value, or sequence number is when equaling state variable VT (S) value and subtracting 1 AMD PDU by negatory affirmation, and timer Timer_Poll will be terminated.If timer expiry and do not receive the status report that satisfies above-mentioned criterion, then inquiry is once restarted timer simultaneously, and is preserved new VT (S) value again.
Though adopt Poll Timer mechanism can avoid deadlock, in the following cases, the bigger problem of delaying time can occur:
When state variable VT (A) is not equal to VT (S), send that last new AMDPDU is sent out away in the buffering area, send poll bits simultaneously, started timer Timer_Poll this moment.Lose in transmission course or made mistakes if carry this AMD PDU of poll bits, perhaps the receiving entity status report of responding this inquiry is lost in transmission course or has been made mistakes, and then obviously this timer can be overtime.At this moment, do not have the AMD PDU of new AMD PDU or re-transmission to dispatch again,, handle as follows according to present method:
If the send window size of configuration equals the AMD PDU of VT (S)-1 more than or equal to 2048:--scheduling sequence number;
Otherwise, if the send window size of configuration equals the AMD PDU of VT (S)-1 less than 2048:--scheduling sequence number; Perhaps,--any AMD PDU that scheduling is not confirmed by peer-entities.
Simultaneously sending entity adds 1 to the number of retransmissions variable V T (DAT) of the AMD PDU that is dispatched to, and the VT of each AMD PDU (DAT) quilt it sends for the first time before is put 0, and the every re-transmission of this variable once adds 1.
If VT (DAT) does not reach maximum transmission times MaxDAT, then notify bottom to be ready for sending data;
If VT (DAT) equals MaxDAT, then abandon process or reseting procedure according to the configuration initialization.
Can see,, then can initialization abandon process or reseting procedure, can cause some AMD PDU to be dropped if the AMD PDU that is dispatched to according to top method reaches maximum transmission times MaxDAT; Simultaneously, can not send this PDU in such cases again to bottom, therefore timer Timer_Poll just can not start yet, so just can not trigger the transmission of status report again, unless there is new AMD PDU to be scheduled for, just the Sheng Xia AMD PDU that is not identified need wait until that high level has new data to arrive, and has the transmission that new AMD PDU is assembled, just might trigger status report when sending.
For sudden strong data service, the time interval between the data burst generally can be long, when above-mentioned sight took place, the data of last data burst will wait until that the data of next burst could continue to send when arriving again, thereby the packet with burst has bigger time delay before causing.
Summary of the invention
In view of this, main purpose of the present invention is to provide the dispatching method of data cell in a kind of communication system, makes the recipient in time confirm the data cell that transmit leg transmits, and avoids causing big transfer delay, reduces abandoning of data cell.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
The method of dispatch state report request msg unit in a kind of communication system, this method may further comprise the steps:
A, the request of sending entity decision status report;
B, sending entity are selected a data cell that sends number of times less than predefined maximum transmission times in the middle of the transmission buffering area;
C, sending entity are provided with the status report solicited message in selecteed data cell, and this data cell is sent to receiving entity.
Described step B may further include: when the transmission number of times of all data cells all equals maximum transmission times in the middle of sending buffering area, select one from the data cell that all are not identified as yet.
Described step C may further include: if the transmission number of times of selecteed data cell then abandons this data cell greater than maximum transmission times.
It is 0 that the transmission number of times of described data cell can send preposition in data cell for the first time, when sending this data cell at every turn, sends number of times and adds 1; Described maximum transmission times is the threshold value of the transmission number of times that sets in advance.
Described communication system can or be the TD-SCDMA system for the WCDMA system.
Under the affirmation pattern of the radio link control of described communication system, start automatic retransmission mechanism.
Sending entity is received the data cell that retransmits mistake or lose behind the status report of receiving entity transmission in the described automatic retransmission mechanism; This status report can adopt Poll Timer status report trigger mechanism to trigger.
Described steps A takes a step forward and comprises: sending entity judges whether the Timer_Poll timer is overtime, if overtime then execution in step A, otherwise would wait for the status report that receiving entity sends;
Described step C further comprises: sending entity starts the Timer_Poll timer when sending selecteed data cell.
Step C is described in this data cell, be provided with the status report request method can for: poll bits is set in data cell.
Described communication system can also be the CDMA2000 system.
In the automatic repeat requests sublayer of the link access control protocol of described communication system, start automatic retransmission mechanism.
As seen from the above technical solutions, the method for dispatch state report request msg unit in this communication system of the present invention, one of priority scheduling sends number of times and comes the status report request less than the data cell of maximum transmission times.Like this, the recipient receives the data cell return state report that just can transmit transmit leg in time after this data cell, can avoid causing big transfer delay.Because the priority scheduling peer-entities still comes the status report request in the unacknowledged data unit, reduced its number of retransmissions and reached peaked chance, thereby reduced abandoning of data cell simultaneously.
Description of drawings
Fig. 1 is the protocol architecture schematic diagram of wave point;
Fig. 2 is the operation principle schematic diagram of RLC AM functional entity model;
Fig. 3 is a RLC sliding window schematic diagram;
Fig. 4 sends the flow chart of poll bits for a preferred embodiment of the present invention scheduling.
Embodiment
For make purpose of the present invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The method of dispatch state report request msg unit in this communication system of the present invention, suitable communication system is made up of sending node that comprises sending entity and the receiving node that comprises receiving entity.Its main thought is: sending entity is after the request of decision status report, and the data cell that one of priority scheduling sends number of times less than maximum transmission times is provided with the status report request, and sends it to receiving entity in this data cell.
A preferred embodiment of the present invention is to realize under the AM pattern of rlc protocol in the WCDMA communication system that has started automatic request retransmission mechanism ARQ.Under this pattern, trigger the receiving entity status report mechanism be to send query requests by sending entity, this query requests is to realize by the poll bits territory that data cell is set.
The present embodiment sending entity selects one to send the data cell that number of times is less than or equal to predefined maximum transmission times in the middle of sending buffering area after the request of decision status report; The status report solicited message is set in selecteed data cell, and this data cell is sent to receiving entity.
This embodiment specifically comprises 4 steps:
Step 1, as AMD PDU during greater than maximum transmission times MaxDAT, sending entity abandons or resets; It is 0 that the transmission number of times of AMD PDU can send preposition in data cell for the first time, when sending this data cell at every turn, sends number of times and adds 1; Maximum transmission times is the threshold value of the transmission number of times that sets in advance.
Step 2, sending entity decision status report request when Timer_Poll is overtime: judge to send the new AMD PDU that whether has in the middle of the buffering area AMD PDU that is not identified as yet and will retransmits maybe will send, if then select a data unit execution in step 4 therein; Otherwise, execution in step 3;
Step 3, if the number of retransmissions of all AMD PDU that are not identified as yet all equals maximum transmission times MaxDAT, the AMD PDU that then selects any one not to be identified as yet;
Otherwise, from be not identified as yet and also number of retransmissions less than selecting any one PDU the AMDPDU of maximum transmission times MaxDAT;
Step 4, sending entity are dispatched selecteed AMD PDU, in this AMD PDU poll bits are set, and send it to receiving entity.Sending entity starts the Timer_Poll timer when sending AMD PDU.
In the above-mentioned steps, the processing method of step 1 is very simple, and is same as the prior art, do not giving unnecessary details here.The detailed process of step 2-4 is referring to Fig. 4, and Fig. 4 sends the flow chart of poll bits for a preferred embodiment of the present invention scheduling.It specifically may further comprise the steps:
Whether step 401, sending entity detect Timer_Poll overtime, if execution in step 402 then, otherwise wait for affirmation or the non-confirmation that receiving entity returns by status report.
Step 405 is selected an AMD PDU who is not identified as yet in send window.
Step 406 judges whether the AMD PDU that selects equals maximum transmission times MaxDAT, if then return step 405, otherwise execution in step 407.
Step 408 sends the AMD PDU that this carries poll bits, starts the Timer_Poll timer when sending this AMD PDU, and the number of retransmissions of this AMD PDU is added 1.
Present embodiment is on existing P oll Timer manufacturing basis, improved the dispatching method that sends the AMDPDU of poll bits, when Timer_Poll has triggered inquiry, and inquiry does not have under the forbidden situation, do not arrive when sending or retransmitting if there is AMD PDU to be scheduled, wait for not resembling in the prior art when the next data AMD PDU that happens suddenly is scheduled and send poll bits with this AMD PDU, send poll bits but directly dispatch the AMD PDU that a number of retransmissions do not reach maximum transmission times, feasible reception can be received this poll bits and in time the data cell of transmit leg transmission be confirmed, can be avoided causing big transfer delay.Owing to earlier the data cell of not confirmed by peer-entities is as yet dispatched, reduced its number of retransmissions and reached peaked chance, thereby reduced abandoning of data cell simultaneously.
Communication system in this enforcement is the WCDMA system, and is suitable equally for TD-SCDMA system or CDMA2000 system.If WCDMA system or TD-SCDMA system can start automatic repeat requests mechanism under the AM of rlc protocol pattern; For the CDMA2000 system, then automatic repeat requests mechanism can started in the ARQ sublayer of link access control (LAC) agreement.
By the above embodiments as seen, the method of dispatch state report request msg unit in this communication system of the present invention, make the recipient to the timely return state report of data cell that transmit leg transmits, avoid causing big transfer delay, reduce abandoning of data cell.And, do not need hardware device is done any change, realize simple.
Claims (11)
1, the method for dispatch state report request msg unit in a kind of communication system is characterized in that this method may further comprise the steps:
A, the request of sending entity decision status report;
B, sending entity are selected a data cell that sends number of times less than predefined maximum transmission times in the middle of the transmission buffering area;
C, sending entity are provided with the status report solicited message in selecteed data cell, and this data cell is sent to receiving entity.
2, the method for claim 1 is characterized in that, described step B further comprises: when the transmission number of times of all data cells all equals maximum transmission times in the middle of sending buffering area, select one from all data cells.
3, the method for claim 1 is characterized in that, if the transmission number of times of data cell then abandons this data cell greater than predefined maximum transmission times.
4, method as claimed in claim 3 is characterized in that: it is 0 that the transmission number of times of described data cell sends preposition in data cell for the first time, when sending this data cell at every turn, sends number of times and adds 1; Described maximum transmission times is the threshold value of the transmission number of times that sets in advance.
5, the method for claim 1 is characterized in that: described communication system is the WCDMA system or is the TD-SCDMA system.
6, method as claimed in claim 5 is characterized in that: start automatic retransmission mechanism under the affirmation pattern of the radio link control of described communication system.
7, method as claimed in claim 6 is characterized in that: sending entity is received the data cell that retransmits mistake or lose behind the status report of receiving entity transmission in the described automatic retransmission mechanism; This status report adopts Poll Timer status report trigger mechanism to trigger.
8, method as claimed in claim 7 is characterized in that, described steps A takes a step forward and comprises: sending entity judges whether the Timer_Poll timer is overtime, if overtime then execution in step A, otherwise would wait for the status report that receiving entity sends;
Described step C further comprises: sending entity starts the Timer_Poll timer when sending selecteed data cell.
9, method as claimed in claim 7 is characterized in that, the described method that the status report request is set in this data cell of step C is: poll bits is set in data cell.
10, the method for claim 1 is characterized in that, described communication system is the CDMA2000 system.
11, method as claimed in claim 10 is characterized in that, starts automatic retransmission mechanism in the automatic repeat requests sublayer of the link access control protocol of described communication system.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101030841B (en) * | 2006-02-27 | 2011-08-03 | 上海原动力通信科技有限公司 | Method and apparatus for notifying protocol unit length variation |
| CN101030840B (en) * | 2006-03-02 | 2011-09-14 | 华为技术有限公司 | Data transmission with re-transmission demand and method for presenting receiving-end state report |
| CN101039170B (en) * | 2006-03-15 | 2011-08-03 | 华为技术有限公司 | Method for supporting packet retransmission division cascade |
| CN101039228B (en) * | 2006-03-16 | 2010-05-12 | 华为技术有限公司 | Method for optimizing data packet |
| CN101360278A (en) * | 2008-09-17 | 2009-02-04 | 华为技术有限公司 | Method, apparatus and system for instant message receiving and transmitting |
| CN101465719B (en) * | 2008-12-30 | 2012-08-22 | 华为技术有限公司 | Data retransmission method and device |
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| CN1411244A (en) * | 2001-09-29 | 2003-04-16 | 华为技术有限公司 | Method of realizing data retransmission on high speed medium access control layer (MAC-HS) |
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Patent Citations (4)
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| US6519223B1 (en) * | 1999-04-06 | 2003-02-11 | Telefonaktiebolaget L M Ericsson (Publ) | System and method for implementing a semi reliable retransmission protocol |
| CN1358375A (en) * | 1999-04-09 | 2002-07-10 | 艾利森电话股份有限公司 | flexible radio link control protocol |
| CN1411187A (en) * | 2001-09-25 | 2003-04-16 | 华为技术有限公司 | Link self adaptation method based on self adaptation coded modulation and automatic retransmission request |
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