CN1874187A - Method for adjusting time for sending downgoing data frame in synchronous process of transmission channel - Google Patents
Method for adjusting time for sending downgoing data frame in synchronous process of transmission channel Download PDFInfo
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- CN1874187A CN1874187A CN 200510073461 CN200510073461A CN1874187A CN 1874187 A CN1874187 A CN 1874187A CN 200510073461 CN200510073461 CN 200510073461 CN 200510073461 A CN200510073461 A CN 200510073461A CN 1874187 A CN1874187 A CN 1874187A
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Abstract
The method for adjusting time for sending down going data frame in synchronous process for transmission channel includes steps: in condition of that in time of report, using service radio network controller (SRNC) adjusts branch of control frame not as reference branch, the method determines whether the branch passes to Iur interface or not further; if yes, and when difference between time the down going data frame reaches Node B and time of arrival (TOA) of reaching to terminal of received window is minimal in all TOA of soft switching branch, the method adjusts time for sending down going data frame based on TOA of the branch. The invention can adjust time for sending down going data frame even in condition of wrong selection of reference branch so as to guarantee stabilized communication between radio network controller (RNC) and Node B or other RNC under different configuration of network, and raise compatibility between Iub interface and Iur interface of RNC.
Description
Technical field
The present invention relates to the transport channel synchronization technical field, be specifically related to adjust in a kind of transport channel synchronization process the method for downlink data frame delivery time.
Background technology
Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wideband Code Division Multiple Address) communication system comprises: wireless access network (RAN, Radio Access Network) and core net (CN, Core Network).Wherein, RAN realizes all and wireless function associated being also referred to as universal terrestrial access network (UTRAN, Universal Terrestrial Radio Access Network) usually.The network configuration of UTRAN as shown in Figure 1, UTRAN is made up of one group of RNS (RNS, Radio Network Subsystem) that is connected to CN by the Iu interface.A RNS is made up of a radio network controller (RNC, Radio Network Controller) and one or more base station (NodeB).NodeB is connected to RNC by Iub interface.RNC is used for distributing and is attached thereto with control or the Radio Resource of relevant NodeB, between the RNC by the connection of Iur interface.NodeB then finishes the conversion of the data flow between Iub interface and the Uu interface, also participates in a part of RRM simultaneously, and the Uu interface is the interface between NodeB and the user (UE, User Equipmeng).
In the WCDMA system, when current NodeB can not satisfy the communicating requirement of UE, UE need switch on the new NodeB, and UE is during with new NodeB communication, did not interrupt earlier and the getting in touch of former NodeB, and this process is called soft handover.According to the regulation of 3GPP, when UE was in soft changing state, UE must promptly keep strict synchronized relation in each wireless physical channel between the soft handover legs, and particularly, soft handover legs refers to current all branch roads of communicating by letter with the UE maintenance.As shown in Figure 2, the current NodeB1 coverage cell that is in of UE, but, the signal of NodeB1 weakens, and the signal of NodeB2 and NodeB3 has reached communicating requirement, this moment, UE should keep synchronous between the new soft handover legs at the new soft handover legs at former soft handover legs, SRNC and the NodeB2 place at Serving RNC (SRNC, Service RNC) and NodeB2 place and SRNC, Drift Radio Network Controller (DRNC, Drift RNC) and NodeB3 place so.Here, SRNC is used to distribute and manage the Radio Resource of soft handover, and SRNC and DRNC set up when communicating by letter at UE and UTRAN, and the function that network based RNC will realize is to the further division of RNC.
Fig. 3 is the transport channel synchronization process of 3GPP agreement regulation.As shown in Figure 3, when RNC sent downlink data frame to NodeB, this Frame carried a public number of frames (CFN) simultaneously, and CFN has specified NodeB to issue moment of downlink radio frame, as figure: CFN=150.When downlink data frame that RNC sends arrive NodeB the time be engraved in moment of CFN appointment before the time, NodeB can be kept at downlink data frame in the buffering area, waits until always that CFN specifies to arrive just this downlink data frame to be carried at constantly to send to UE in the downlink radio frame; When downlink data frame that RNC sends arrive NodeB the time be engraved in moment of CFN appointment after the time, NodeB can abandon this Frame.Losing and rationally utilize Internet resources for fear of Frame, NodeB inside is provided with a time of reception window, whether this window to arrive moment of NodeB suitable if being used for weighing downlink data frame, to determine whether and need adjust the moment that RNC sends downlink data frame.The scope of this time of reception window can be determined by experience, and concerning same soft handover, the scope of the time of reception window of the NodeB of each soft handover legs correspondence is identical, and simultaneously, the downlink data frame of each soft handover legs issues by SRNC is unified.
Fig. 4 is the schematic diagram of time of reception window, and as shown in Figure 4, TOAWS is the starting point of time of reception window, and TOAWE is the terminal point of time of reception window, and LTOA is the moment the latest of NodeB downlink data receiving frame.If the downlink data frame that RNC sends arrives the moment of NodeB, drop in this time of reception window, promptly between TOAWS and TOAWE, just think to arrive just " good ", need not adjust the delivery time of downlink data frame; If the downlink data frame that RNC sends arrives the moment of NodeB, drop on this time of reception outside window, promptly before TOAWS or after the TOAWE, just think arrive " early " or " evening ", should adjust the delivery time of downlink data frame.For example: if the downlink data frame that RNC sends arrives the moment of NodeB, drop on before this time of reception window, just the moment of the downlink data frame that RNC is sent is adjusted backward; If the downlink data frame that RNC sends arrives the moment of NodeB, drop on after this time of reception window, just the moment of the downlink data frame that RNC is sent is adjusted forward.Simultaneously, if the downlink data frame that RNC sends arrives the moment of NodeB, after LTOA, just think arrive " too late ", this Frame will be lost.TOA among the figure is that downlink data frame arrives the moment of NodeB and the difference of TOAWE, and as can be seen, if downlink data frame was engraved in before the TOAWE when arriving NodeB, then the value of TOA is for just; If downlink data frame arrive NodeB the time be engraved in after the TOAWE, then the value of TOA is for negative.
Fig. 5 is the schematic diagram of adjusting the time of carrying out in soft switching process, as shown in Figure 5, the moment that the downlink data frame that sends as SRNC arrives certain NodeB is when dropping on outside the time of reception window, this NodeB will report a time to adjust control frame to SRNC, need adjust the delivery time of downlink data frame with notice SRNC; Contain TOA in this frame simultaneously, as the TOA=-5.250 millisecond among the figure, SRNC can adjust according to TOA.
In fact, SRNC also needn't adjust control frame to each time that receives and handle because: have only downlink data frame arrive NodeB the time when being engraved in after the LTOA, this Frame just can be lost.Can infer: as long as admission control does not take place the branch road of propagation delay time maximum, admission control just can not take place in other all branch roads, so the TOA that can report according to the branch road of propagation delay time maximum adjusts the delivery time of all subcircuit downlink Frames.
In the prior art, SRNC carries out flow process that the downlink data frame delivery time adjusts as shown in Figure 6, and its key step comprises:
Step 601: when each soft handover legs was set up, SRNC calculated the propagation delay time of each branch road, and the branch road of selecting the propagation delay time maximum is as the reference branch road, and write down the interface module sign of this reference arm correspondence.
Here, reference arm is at current all soft handover legs of same UE.
When each soft handover legs is set up, SRNC can issue a synchrodata frame by this branch road, when the NodeB of this branch road receives this synchrodata frame, can return a sync response frame to SRNC, when SRNC receives the sync response frame that NodeB returns, calculate the time difference of the delivery time of time of reception of sync response frame and synchrodata frame, just can obtain the propagation delay time of this branch road.
The branch road of selection propagation delay time maximum as the foundation of reference branch road is: propagation delay time is big more, and the probability that downlink data frame drops on behind the time of reception window is just big more, and the probability that Frame is lost is also just big more.
SRNC can set up the interface module of this soft handover legs when giving the soft handover legs Resources allocation, this interface module has write down the interface type of interface that this soft handover legs is passed through, and the interface module of different soft handover legs is distinguished with the interface module sign.
Step 602:SRNC receives the time adjustment control frame of NodeB, and this frame carries TOA.
If the downlink data frame that SRNC sends drops on outside the time receiver window of NodeB, NodeB will calculate the difference of due in and the TOAWE of downlink data frame, obtaining TOA, and by time adjustment control frame TOA is reported SRNC.
The time that the NodeB of certain soft handover legs reports is adjusted the interface module that control frame can at first send to this soft handover legs correspondence, will adjust control frame the time after interface module is received and report SRNC, reports the interface module sign of self simultaneously.
Step 603:SRNC judges whether the soft handover legs at this NodeB place is reference arm, if the TOA that carries according to time adjustment control frame adjusts the moment that self issues downlink data frame; Otherwise SRNC does not deal with.
Particularly, SRNC judges that the interface module sign receive is whether identical with the corresponding interface module sign of the reference arm of record in the step 601, if it is identical, just judge that the soft handover legs that reports this time to adjust the NodeB place of control frame is a reference arm, otherwise, judge that the soft handover legs that reports this time to adjust the NodeB place of control frame is not a reference arm.
By said process as can be seen, whether suitable, accurate to the adjustment of downlink data frame delivery time, depend on whether the selection of reference arm is accurate.When soft handover legs is passed through the Iur interface, this size according to propagation delay time determines that the method for reference arm may produce mistake, this be because: different RNC might belong to different operators, and the method for the processing synchrodata frame that different operators is provided during RNC in design might be different.For example: the RNC that has is when receiving the synchrodata frame that all the other RNC send, can promptly this synchrodata frame not sent to NodeB without Iub interface, and directly return the sync response frame, thereby cause the propagation delay time of this branch road that SRNC calculates to be far smaller than real propagation delay time to transmit leg.Therefore, the real propagation delay time of very possible certain bar branch road is greater than the propagation delay time of all the other all branch roads, and the non-maximum of the propagation delay time of this branch road that calculates will cause reference arm to select mistake this moment, it is inaccurate that thereby the time that causes SRNC is adjusted, and makes that downlink data continues to lose.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that realizes adjusting in the transport channel synchronization process downlink data frame delivery time, to improve the accuracy that SRNC adjusts the delivery time of downlink data frame, avoids losing of downlink data frame.
For achieving the above object, technical scheme of the present invention is achieved in that
Adjust the method for downlink data frame delivery time in a kind of transport channel synchronization process, this method comprises:
A, service wireless network controller SRNC are in the current all soft handover legs of user UE, and the soft handover legs of selecting the propagation delay time maximum writes down the sign of this reference arm as the reference branch road;
B, the base station node B adjustment control frame that on SRNC, calls time, this frame carry downlink data frame arrive NodeB constantly with the difference TOA of time of reception window terminal point, after SRNC received that this time adjusts control frame, whether the soft handover legs of judging this NodeB place reference arm, if, execution in step C; Otherwise, continue to judge whether this soft handover legs passes through the Iur interface, and if the TOA of this soft handover legs minimum in all soft handover legs, execution in step C, otherwise this flow process finishes;
C, SRNC adjust the delivery time of downlink data frame according to the TOA of this soft handover legs.
The described propagation delay time of steps A obtains by following steps:
When soft handover legs was set up, the time of reception of SRNC record sync response frame and the delivery time of synchrodata frame calculated the difference in these two moment then, and this difference is the propagation delay time of this branch road.
Described method further comprises:
SRNC sets up the interface module of each soft handover legs respectively when distributing each soft handover legs, and the interface module of different soft handover legs is distinguished with the interface module sign,
Being designated of the described record reference arm of steps A, the interface module sign of record reference arm correspondence,
The described NodeB of step B calls time on SRNC and adjusts control frame and be specially: NodeB will adjust the interface module that control frame sends to self place soft handover legs correspondence the time, after interface module is received this time adjustment control frame, should adjust control frame and self identification notice SRNC the time
The described SRNC of step B judges whether the soft handover legs at this NodeB place is that reference arm is specially: SRNC judges that the interface module sign receive is whether identical with the corresponding interface module sign of reference arm, if the soft handover legs of judging this NodeB place is a reference arm; Otherwise, judge that the soft handover legs at this NodeB place is not reference arm.
Described method further comprises:
SRNC sets up the interface module of the interface type that records interface that each soft handover legs is passed through respectively when distributing each soft handover legs, the interface module of each soft handover legs is distinguished with the interface module sign,
The described NodeB of step B calls time on SRNC and adjusts control frame and be specially: NodeB will adjust the interface module that control frame sends to self place soft handover legs correspondence the time, after interface module is received this time adjustment control frame, should adjust control frame and self identification notice SRNC the time
The described SRNC of step B judges whether this NodeB place soft handover legs is specially through the Iur interface: SRNC is identified at the interface type of the soft handover legs process interface of self searching this NodeB place according to interface module, judge in the interface type that finds whether comprise the Iur interface then, if comprise, the soft handover legs of then determining this NodeB place is through the Iur interface.
The TOA of the described soft handover legs of step B is that the time that the NodeB of this branch road reports in the certain hour is adjusted the mean value of the TOA that carries in the control frame recently.
Compared with prior art, the present invention is not under the situation of reference arm by the branch road at the last adjustment control frame that calls time, further judge whether this branch road passes through the Iur interface, if and the TOA of this branch road is minimum in the TOA of all soft handover legs, just according to the delivery time of the TOA adjustment downlink data frame of this branch road.The invention enables in reference arm and select under the wrong situation, still can realize the correct time adjustment, guarantee under different networking situations that RNC can realize stabilized communication with Node B or other RNC, strengthened the networking capability of RNC, improved RNC at Iub, Iur interface compatibility.
Description of drawings
Fig. 1 is the UTRAN schematic network structure;
Fig. 2 is the soft switching process schematic diagram;
Fig. 3 is the transport channel synchronization schematic diagram of mechanism;
Fig. 4 is the schematic diagram of the time of reception window of NodeB;
The schematic diagram that Fig. 5 adjusted for the time of carrying out in the soft switching process;
Fig. 6 carries out the flow chart that the downlink data frame delivery time is adjusted for prior art;
Fig. 7 carries out the flow chart that the downlink data frame delivery time is adjusted for the present invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Core concept of the present invention is: SRNC is in the current all soft handover legs of UE, and the soft handover legs of selecting the propagation delay time maximum is as the reference branch road, and writes down the sign of this reference arm; When SRNC receives time that carries TOA that NodeB reports when adjusting control frame, whether the soft handover legs that SRNC judges this NodeB place reference arm, if SRNC is just according to the delivery time of the TOA adjustment downlink data frame of this soft handover legs; Otherwise, SRNC continues to judge whether this soft handover legs passes through the Iur interface, and if the TOA of this soft handover legs minimum in all soft handover legs, SRNC just adjusts the delivery time of downlink data frame according to the TOA of this soft handover legs, otherwise SRNC does not do any processing.
Fig. 7 is provided by the invention in the transport channel synchronization process, carries out the flow chart that the downlink data frame delivery time is adjusted, and as shown in Figure 7, its concrete steps are as follows:
Step 701: when each soft handover legs was set up, SRNC calculated the propagation delay time of each branch road, and the branch road of selecting the propagation delay time maximum is as the reference branch road, and write down the sign of this reference arm.
The step of the propagation delay time of calculating branch road is same as the prior art.
In fact, the SRNC record is the interface module sign of reference arm correspondence.Same as the prior art, SRNC is when giving the soft handover legs Resources allocation, can set up the interface module of this soft handover legs, this interface module has write down the interface type of interface that this soft handover legs is passed through, and the interface module of different soft handover legs is distinguished with the interface module sign.
Step 702:SRNC receives the time adjustment control frame that NodeB reports, and this frame carries the TOA value, and RNC preserves this TOA.
Same as the prior art, the time that the NodeB of certain soft handover legs reports is adjusted the interface module that control frame can at first send to this soft handover legs correspondence, to adjust control frame the time after interface module is received and report SRNC, report the interface module sign of self simultaneously.
Step 703:SRNC judges whether the soft handover legs at this NodeB place is reference arm, if, execution in step 706; Otherwise, execution in step 704.
SRNC judges that whether the soft handover legs at this NodeB place is that the step of reference arm is same as the prior art.
Step 704:SRNC judges whether this soft handover legs passes through the Iur interface, if, execution in step 705; Otherwise SRNC does not deal with, and this flow process finishes.
Owing to record the interface type of corresponding soft handover legs in the interface module that SRNC sets up through interface, so SRNC is according to this interface module sign, just can judge in the interface type that finds whether comprise the Iur interface then at the interface type that self finds interface that this soft handover legs is passed through.
Step 705:SRNC judges whether the TOA of this branch road is minimum in the TOA of all soft handover legs, if, execution in step 706; Otherwise SRNC does not deal with, and this flow process finishes.
Be to improve accuracy, the mean value that SRNC generally gets the TOA that each soft handover legs reports in nearest a period of time carries out the size comparison of TOA.
Step 706:SRNC adjusts the delivery time of downlink data frame according to the TOA of this branch road.
The TOA that SRNC can report according to branch road the last time also can adjust the delivery time of downlink data frame according to the mean value of the TOA that reports in the nearest certain hour.
Downlink data frame because transmission shake etc. takes place, can cause propagation delay time to become big, thereby make the time delay that arrives NodeB in transmission course.Therefore, without the non-reference arm of the Iur interface adjustment control frame that also calls time in the meeting sometimes.But this phenomenon is accidental, temporary transient, so SRNC does not deal with.
The above only is process of the present invention and method embodiment, in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is not equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1, adjust the method for downlink data frame delivery time in a kind of transport channel synchronization process, it is characterized in that this method comprises:
A, service wireless network controller SRNC are in the current all soft handover legs of user UE, and the soft handover legs of selecting the propagation delay time maximum writes down the sign of this reference arm as the reference branch road;
B, the base station node B adjustment control frame that on SRNC, calls time, this frame carry downlink data frame arrive NodeB constantly with the difference TOA of time of reception window terminal point, after SRNC received that this time adjusts control frame, whether the soft handover legs of judging this NodeB place reference arm, if, execution in step C; Otherwise, continue to judge whether this soft handover legs passes through the Iur interface, and if the TOA of this soft handover legs minimum in all soft handover legs, execution in step C, otherwise this flow process finishes;
C, SRNC adjust the delivery time of downlink data frame according to the TOA of this soft handover legs.
2, the method for claim 1 is characterized in that, the described propagation delay time of steps A obtains by following steps:
When soft handover legs was set up, the time of reception of SRNC record sync response frame and the delivery time of synchrodata frame calculated the difference in these two moment then, and this difference is the propagation delay time of this branch road.
3, the method for claim 1 is characterized in that, described method further comprises:
SRNC sets up the interface module of each soft handover legs respectively when distributing each soft handover legs, and the interface module of different soft handover legs is distinguished with the interface module sign,
Being designated of the described record reference arm of steps A, the interface module sign of record reference arm correspondence,
The described NodeB of step B calls time on SRNC and adjusts control frame and be specially: NodeB will adjust the interface module that control frame sends to self place soft handover legs correspondence the time, after interface module is received this time adjustment control frame, should adjust control frame and self identification notice SRNC the time
The described SRNC of step B judges whether the soft handover legs at this NodeB place is that reference arm is specially: SRNC judges that the interface module sign receive is whether identical with the corresponding interface module sign of reference arm, if the soft handover legs of judging this NodeB place is a reference arm; Otherwise, judge that the soft handover legs at this NodeB place is not reference arm.
4, the method for claim 1 is characterized in that, described method further comprises:
SRNC sets up the interface module of the interface type that records interface that each soft handover legs is passed through respectively when distributing each soft handover legs, the interface module of each soft handover legs is distinguished with the interface module sign,
The described NodeB of step B calls time on SRNC and adjusts control frame and be specially: NodeB will adjust the interface module that control frame sends to self place soft handover legs correspondence the time, after interface module is received this time adjustment control frame, should adjust control frame and self identification notice SRNC the time
The described SRNC of step B judges whether this NodeB place soft handover legs is specially through the Iur interface: SRNC is identified at the interface type of the soft handover legs process interface of self searching this NodeB place according to interface module, judge in the interface type that finds whether comprise the Iur interface then, if comprise, the soft handover legs of then determining this NodeB place is through the Iur interface.
5, the method for claim 1 is characterized in that, the TOA of the described soft handover legs of step B is that the time that the NodeB of this branch road reports in the certain hour is adjusted the mean value of the TOA that carries in the control frame recently.
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| CNB2005100734612A CN100558005C (en) | 2005-05-30 | 2005-05-30 | Adjust the method for downlink data frame delivery time in a kind of transport channel synchronization process |
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| CNB2005100734612A CN100558005C (en) | 2005-05-30 | 2005-05-30 | Adjust the method for downlink data frame delivery time in a kind of transport channel synchronization process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009033380A1 (en) * | 2007-09-12 | 2009-03-19 | Zte Corporation | A transmission channel synchronizing/time adjusting method for high speed downlink shared channel |
| CN101212668B (en) * | 2006-12-26 | 2011-06-22 | 松下电器产业株式会社 | Information delivery apparatus, stream recording apparatus, recording system and stream reproducing apparatus |
| CN101765169B (en) * | 2008-12-25 | 2012-02-01 | 鼎桥通信技术有限公司 | Switching method in base station |
| CN102769491A (en) * | 2011-05-03 | 2012-11-07 | 鼎桥通信技术有限公司 | Sending method of timing adjustment control frame and base station |
| CN111246421A (en) * | 2019-12-31 | 2020-06-05 | 航天信息股份有限公司 | Method, device, storage medium and electronic equipment for transmitting data |
-
2005
- 2005-05-30 CN CNB2005100734612A patent/CN100558005C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212668B (en) * | 2006-12-26 | 2011-06-22 | 松下电器产业株式会社 | Information delivery apparatus, stream recording apparatus, recording system and stream reproducing apparatus |
| WO2009033380A1 (en) * | 2007-09-12 | 2009-03-19 | Zte Corporation | A transmission channel synchronizing/time adjusting method for high speed downlink shared channel |
| CN101765169B (en) * | 2008-12-25 | 2012-02-01 | 鼎桥通信技术有限公司 | Switching method in base station |
| CN102769491A (en) * | 2011-05-03 | 2012-11-07 | 鼎桥通信技术有限公司 | Sending method of timing adjustment control frame and base station |
| CN111246421A (en) * | 2019-12-31 | 2020-06-05 | 航天信息股份有限公司 | Method, device, storage medium and electronic equipment for transmitting data |
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| Publication number | Publication date |
|---|---|
| CN100558005C (en) | 2009-11-04 |
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