CN100459484C - Method for information interaction between base station and user terminal - Google Patents
Method for information interaction between base station and user terminal Download PDFInfo
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- CN100459484C CN100459484C CNB2005100719684A CN200510071968A CN100459484C CN 100459484 C CN100459484 C CN 100459484C CN B2005100719684 A CNB2005100719684 A CN B2005100719684A CN 200510071968 A CN200510071968 A CN 200510071968A CN 100459484 C CN100459484 C CN 100459484C
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Abstract
This invention relates to a method for interacting information between base stations and user terminals including: a base station judges if it has received a confirmation message that data packets in a sending window are obtained by a user terminal correctly, if not, the sending window keeps unchanged, if so, it monitors by a timer the existing time length of the data packet in the window with the largest sending number in the data packets and judges if the timer is over the time, if so, it exchanges the bottom of the sending window to a first data packet after that with the largest sequence number, otherwise, the window is unchanged, finally, the station sends data packets not receiving the confirmation message.
Description
Technical field
The present invention relates to the information interacting method of base station and user terminal in the WCDMA network, especially a kind ofly relate to the exchange method that information retransmits.
Background technology
Introduced high speed downlink packet and insert shared channel (HSDPA, highspeed downlink packet access) in the WCDMA system, this channel adopts Adaptive Modulation and Coding to carry out issuing of information.Described Adaptive Modulation and Coding is promptly: employed modulation system of this channel and coding redundancy degree can dynamically be adjusted according to channel circumstance, when channel condition is good, adopt the coded system of high-order modulating and low redundancy, to improve spectrum efficiency and sign indicating number resource utilization; If channel condition is bad, then when the information of carrying out issues, adopt the coded system of low-order-modulated mode and high redundancy degree.
In order to remedy the error of Adaptive Modulation and Coding control, thereby in the information interactive process of system base-station and user terminal, introduced the information retransmission mechanism.
In the prior art, the information interaction mechanism of base station and user terminal is: the base station is with in the transmit queue, being arranged in the packet that sends window sends according to the size that transmits Sequence Number, user terminal sends affirmation (ACK) information to the base station after correctly obtaining this packet, the base station sends again for the packet in the formation of not receiving confirmation; In user terminal (UE) side, owing to there is the re-transmission of information, thereby make the order of the packet that UE finally obtains that variation take place, therefore, UE need sort to the packet that receives in buffer memory again, and simultaneously, UE utilizes the T1 parameter of system's setting that the packet in the internal memory is managed, promptly when timer arrives the T1 duration, just the packet in the buffer memory is sent in the higher layer entities and handle.
By prior art as can be known, base station side only judges whether packet is retransmitted according to affirmation (ACK) information that the UE that is obtained sends.And then the defective of prior art is:
1) base station is according to (the TSN that transmits Sequence Number, Transmission Sequence Number) size sends packet successively, because the variation of channel condition, may cause the little packet of TSN correctly not received at first by UE, though the base station can retransmit this packet, yet, when this packet arrives UE, other packets that reordered in buffer memory have been waited in buffer memory and have been surpassed T1 (comprising the big packet of TSN), and be sent to and carry out subsequent treatment in the UE upper layer entity, because prior art has also comprised correction process in upper layer entity, thereby, even the packet that TSN is little retransmits successfully, the UE side also can be with this data packet discarding, and carries out reordering of follow-up data bag.
2) if because the variation of channel condition causes the little packet of TSN to fail in time to be obtained by UE, and the big packet of TSN is obtained by UE and reorders in buffer area, if the packet that described TSN is big is bigger, make packet seldom just buffer area may be taken, cause UE that these packets are delivered to the upper strata.At this moment, even the little packet of TSN retransmits successfully, also will be abandoned by UE, because be sent to the UE upper strata when carrying out subsequent treatment when available data bag in the buffer area, UE will only reorder to the big packet of follow-up TSN.
In sum, prior art has caused base station side to some packet unnecessary retransmission, and then causes the waste of bottom transmission bandwidth, has reduced the bottom efficiency of transmission.
Summary of the invention
The problem to be solved in the present invention provides a kind of base station and the mutual method of user terminal information, and this method can be avoided base station side packet unnecessary retransmission.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions:
1) base station judges whether to receive the affirmation information that the packet in the window is obtained by user terminal that sends, if then do not carry out step 3), if have, monitor in those packets of receiving confirmation with timer that then there is duration in the packet that is sent by the base station in described transmission window at last;
2) judge whether timer is overtime, if overtime, then the lower edge of described transmission window is updated to first packet behind the above-mentioned packet that is sent by the base station at last; Otherwise sending window remains unchanged;
3) base station sends the packet of not receiving confirmation in the described transmission window.
On the said method basis, step 2) and between the step 3) also comprise: calculate in the transmission window after renewal, send to same user terminal and receive the length of data package summation of user terminal confirmation, judge whether described length summation takies thresholding greater than the user terminal buffer memory that presets, if take thresholding greater than buffer memory, then the base station stops to issue the packet that sends in the window, otherwise carries out step 3); Or in the transmission window of calculating after renewal, send to same user terminal and receive the length of data package summation of user terminal confirmation, and whether the ratio of judging described data packet length summation and user terminal buffer memory capacity is greater than this user terminal buffer memory occupancy, if take thresholding greater than buffer memory, then the base station stops to issue the packet that sends in the window, otherwise carries out step 3).
On the said method basis, step 1) of the present invention can realize in the following manner:
11) if receive the affirmation information of user terminal, then judge currently receive whether the transmitting Sequence Number of packet of confirmation is not less than transmitting Sequence Number of current transmission window lower edge packet, then carry out step 12) if be not less than, if less than then carrying out step 3);
12) judge whether timer is just monitoring the duration that packet exists in the current transmission window, if then carry out step 2); Otherwise carry out step 13);
13) timer picks up counting, and monitor to send to receive ACK in the window and there is duration in the maximum packet that transmits Sequence Number in sending window.
Further, comprise step after the step 11): judge that by transmitting Sequence Number of comparing data bag whether the described packet of receiving current confirmation is that the lower edge of described transmission window judges whether the lower edge into described transmission window, if first does not receive the packet of confirmation after then described transmission window lower edge being updated to this packet; Otherwise carry out step 12).
Among the present invention, step 3) is for periodically sending the packet of not receiving user's confirmation ACK in the described transmission window.
Above technical scheme as can be seen, compared with prior art, in the present invention, base station side in carrying out the process that packet issues with reference to the reorder behavior of entity of user terminal.Be specially: utilize the T1 parameter prediction to send the duration of packet arrival user terminal buffer memory in the window, simultaneously, with reference in the existing user terminal buffer memory to the treatment mechanism of packet, judge whether the packet in the current transmission window in base station is the stale data of user terminal, and then dynamically update the position that the base station sends window, avoid the base station to send for the expired packet of user terminal; Further, on the said method basis, the present invention utilizes and sends the occupancy of having received the length of data package summation predictive user terminal buffers of user terminal A CK in the window, judge whether the interior packet of the current transmission window in base station can be owing to the user terminal buffer memory takies limited being dropped after issuing, and then dynamically update the transmission window of base station, to adjust the transmission speed of base station data bag.
In sum, the behavior of the present invention by issuing in the process entity that user terminal reordered at packet as a reference, avoided the invalid of base station side packet to issue, and then, because the present invention has saved the bottom bandwidth resources, improve the bottom bandwidth availability ratio, thereby had the bottom of raising efficiency of transmission, reduced the advantage of high level data packet loss.
Description of drawings
Fig. 1 is the inventive method flow chart;
Process chart when Fig. 2 obtains the user terminal confirmation for base station in the inventive method;
The flow chart of Fig. 3 for being distributed as under the base station data bag in the inventive method.
Embodiment
Core concept of the present invention is: base station side in carrying out the process that packet issues with reference to the reorder behavior of entity of user terminal, promptly utilize the T1 parameter prediction to send the duration of packet arrival user terminal buffer memory in the window, utilize and send the occupancy of having received the length of data package summation predictive user terminal buffers of user terminal A CK in the window, simultaneously, with reference in the existing user terminal buffer memory to the treatment mechanism of packet, judge after the interior packet of the current transmission window in base station issues whether can be abandoned by user terminal, and then dynamically the transmission window of base station is adjusted, avoid the base station to send, or dynamically adjust the transmission speed of base station data bag according to the occupancy of active user's terminal buffers the expired packet of user terminal.
Described user terminal with base station information reciprocal process in to the reception mechanism of packet be: the base station issues packet successively according to transmitting Sequence Number of packet, and because the base station sends the retransmission mechanism of packet, thereby variation may take place in the order that arrives the packet of user terminal, after user terminal obtains the packet that the base station issues, put it in the buffer memory and reorder, simultaneously, timer begins to monitor in the reorder queue that the last data in buffer that arrives wraps in RT in the buffer memory, when this packet exists in buffer memory above behind the T1 duration, this packet in the buffer memory and the packet received before sent in the upper layer entity handle, and the follow-up packet that receives is reordered according to transmitting Sequence Number, at this moment, carry out discard processing for retransmitting the packet formerly that obtains by the base station.On the other hand, when user terminal buffer memory occupancy surpasses the thresholding that presets,, but still carry out discard processing for the packet that user terminal obtains at this moment even the packet in buffer memory also is not sent in the upper layer entity.
According to the reception mechanism of above core concept and user terminal data bag, introduce full implementation mode of the present invention.
Fig. 1 is an embodiment of the invention handling process schematic diagram; With reference to this figure as can be known:
Step 11: the base station obtains the affirmation information that user terminal obtains packet, and according to the packet of this confirmation correspondence, dynamically adjust the position that base station data bag transmit queue sends window, monitoring data wraps in and sends the duration that exists in the window with predictive user terminal buffers timer duration simultaneously;
Step 12: judge whether described timer timing arrives T1, then adjust the position that base station data bag transmit queue sends window if arrive;
Step 13: judge whether user terminal buffer memory occupancy surpasses the threshold value that presets, if surpass described threshold value, then carry out step 14, otherwise the base station time-out issues packet;
Step 14: the base station sends the packet of not receiving user terminal acknowledge message (ACK) in the described transmission window.
With reference to Fig. 2, illustrate among the present invention, the handling process when the described base station of step 11 obtains the affirmation information of described user terminal, promptly the method that sends window is upgraded in the base station.
Step 21: user terminal obtains the feedback one affirmation information (ACK) about this packet behind the packet that the base station issues, and then the base station obtains described confirmation;
Step 22: judge that the transmitting Sequence Number of the pairing packet of this ACK (ACK_TSN) and base station data bag send the size of transmit Sequence Number (LowerEdge_TSN) of window lower edge (TxWindow_LowerEdge) packet, to judge that packet that this user terminal obtains is whether in sending window, if ACK_TSN is less than LowerEdge_TSN, illustrate that this packet is not in sending window, do not impel the base station to send the adjustment of window in this case, promptly carry out step 23; If ACK_TSN is not less than LowerEdge_TSN, then carry out step 24;
As is known to the person skilled in the art, transmitting Sequence Number of described packet is used for the sequencing that identification data packet is sent by the base station, and generally, the back send packet identified transmit Sequence Number greater than send earlier packet identified transmits Sequence Number, only implementation method of the present invention is described in the present embodiment by the occupation mode that transmits Sequence Number in the prior art, yet do not limit the identification method that packet transmits Sequence Number, as: according to the sending order of packet, described transmitting Sequence Number reduces etc. gradually;
As is known to the person skilled in the art, described transmission window has determined that certain moment base station will send the scope of packet down, and is promptly constantly certain, and only the packet in sending window is allowed to send; Correctly obtained by user terminal along with issuing packet in the transmission window, the transmission window will be updated to outgoing data new in the data packet queue and wrap, and base station data-driven bag transmits Sequence Number and sends packet successively;
Step 23: send window and do not do any variation, carry out step 28;
Step 24: judge whether ACK_TSN equals LowerEdge_TSN, if equate, promptly the packet of this ACK_TSN then carry out step 25, otherwise carry out step 26 for sending the lower edge of window;
Step 25: the packet for ACK_TSN described in the step 24 is the situation that sends the window lower edge, to send window position adjustment, be specially packet from above-mentioned ACK_TSN, search along the direction that TSN increases, with first packet of ACK of not receiving user terminal as the lower edge (TxWindow_LowerEdge) of new transmission window; Carry out step 26;
Step 26: judge whether the base station side timer carries out timing to the packet in the current transmission window, if not, comprising then that timer is not opened carries out timing to any packet, or timer carries out the timing both of these case to current at the packet (TSN of this packet is less than sending window lower edge packet TSN) that sends outside window, carry out step 27 this moment, otherwise carry out step 28;
Step 27: open timer again, in sending window, receive in the packet of user terminal A CK, (TSN) the maximum packet that transmits Sequence Number is carried out timing, carry out step 28;
Step 28: calculate the data packet length summation of having received ACK in the packet transmit queue in the current transmission window.
Above-mentioned a kind of realization mechanism to the packet timing is: the Boolean variable whether T1IsStarting opens for the sign timer is set, and the T1IsStarting value is Yes or No; Transmit Sequence Number (TSN) of the packet of T1_TSN indication causing timer timing is set, promptly current by the TSN of the packet of timer timing; The startup of TimeT1Starting record timer constantly; TimePresent is a current time.According to the parameter of above-mentioned T1 moment timer, those skilled in the art can realize the application of relevant timer among the present invention.With step 26 is example, and the application process of above-mentioned parameter is: judge the Boolean of T1IsStarting, if No then carry out step 27; If Yes judges further that then T1_TSN whether less than transmit Sequence Number (LowerEdge_TSN) that send window lower edge packet, if then carry out step 27, otherwise carry out step 28.With reference to giving an example, those skilled in the art are not difficult to use other steps that above-mentioned parameter is realized present embodiment, and the present invention does not get rid of other methods that realizes that timers are used.
By step 26 to step 27 as can be known, if ACK_TSN is more than or equal to LowerEdge_TSN, be that the current packet that obtains of user terminal is in the transmission window of base station the time, all are received in the packet of user terminal A CK in sending window, and base station monitoring is the duration of packet in sending window of TSN maximum wherein.For the packet that sends in the window, the packet of not receiving user terminal A CK will be retransmitted in the base station, the packet that is obtained by user terminal reorders in the buffer memory of user terminal, and, timer carries out timing to the packet of TSN maximum in the data packet queue that is obtained, monitor whether its time at buffer memory surpasses the T1 duration, thereby base station side to send the timing of receiving the packet of TSN maximum among the ACK in the window will be near the timing of user terminal buffer memory internal timer, and then the base station can according to described the timing that sends the window packet is judged be distributed as the behavior of user terminal to adjust under the base station data bag.
With reference to Fig. 3,, the adjustment that is distributed as under the above-mentioned packet is described corresponding to step 12,13,14.If the base station issues to periodically issuing packet, the handling process that then arrives transmission base station side during the cycle is:
Step 31: whether the value of judging timer surpasses duration T1, if then carry out step 32; Otherwise carry out step 35;
Step 32: from the packet of timer timing, search (promptly beginning to search), first is not received that the packet of user terminal A CK is updated to the lower edge (TxWindow_LowerEdge) that sends window, carry out step 33 from T1_TSN along the direction that TSN increases;
Step 33: judge in the transmission window after upgrading whether have the packet of receiving user terminal A CK, carry out step 34 if having then, otherwise carry out step 310, promptly close timer and carry out step 35;
Step 34: open timer again, in sending window, receive in the packet of user terminal A CK, (TSN) the maximum packet that transmits Sequence Number is carried out timing, carry out step 35;
Step 35: calculate the data packet length summation of having received ACK in the packet transmit queue in the current transmission window;
Step 36:,, obtain user terminal data packet length summation with the addition of described data packet length summation for the packet transmit queue that sends to same user terminal;
Step 37: the ratio that obtains described user terminal data packet length summation and user terminal cache size, promptly dope the occupancy of user terminal buffer memory, judge whether to surpass the user terminal buffer memory occupancy thresholding that presets, carry out step 38 if surpass side, otherwise carry out step 39;
Step 38: current issuing do not carried out issuing of base station data bag in the cycle;
Step 39: the base station will send the packet of not receiving user terminal acknowledge message (ACK) in the window and issue.
In the foregoing description, can use MAC-hsReordering Buffer Size for RLC-UM parameter in the 3GPP agreement to the judgement of base station buffer memory occupancy, this parameter is used for the management of subscriber terminal side buffer memory, thereby utilize this parameter, those skilled in the art can realize above-mentioned prediction to user terminal buffer memory occupancy equally, yet the present invention does not get rid of other execution modes that can reach identical purpose.
One alternative of step 37 is: judge whether described length summation takies thresholding greater than the user terminal buffer memory that presets, if carry out step 38 greater than side, otherwise carry out step 39.
High speed downlink packet in 3GPP R5 version inserts shared channel (HSDPA), and this channel adopts provides the modulation of high-order and the method raising spectrum efficiency of redundant chnnel coding still less.The modulation system of HSDPA channel is QPSK or 16QAM, and chnnel coding is the Trubo coding, and the coding maximum redundancy is 1/3; The modulation system of this channel and coding redundancy can dynamically be adjusted according to channel circumstance, adopt high order modulation and low redundant channels coding when channel condition is good, and high upper strata speed is provided, and be then opposite during bad channel conditions.The HSDPA channel adopts 2 milliseconds Transmission Time Interval (TTI), the cycle of issuing that is the base station data bag is 2 milliseconds, because TTI is less, thereby can better follow the tracks of the variation of each subscriber channel condition, and then in time the bid condition constantly is used to send data preferably.
For the error that the Adaptive Modulation and Coding that remedies HSDPA is controlled, introduce the HARQ agreement at bottom and retransmit; In order to make full use of the information of each time re-transmission, adopt incremental redundancy decoding.The present invention is applicable to that more the packet of this channel issues control.Above content constitutes the present invention's one full implementation example.
More than the mutual method of base station provided by the present invention and user terminal information is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (7)
1, the mutual method of a kind of base station and user terminal information is characterized in that:
1) base station judges whether to receive the affirmation information that the packet in the window is obtained by user terminal that sends, if then do not carry out step 3), if have, monitor in those packets of receiving confirmation with timer that then there is duration in the packet that is sent by the base station in described transmission window at last;
2) judge whether timer is overtime, if overtime, then the lower edge of described transmission window be updated to behind the above-mentioned packet that is sent by the base station at last first and do not receive the packet of confirmation; Otherwise sending window remains unchanged;
3) base station sends the packet of not receiving confirmation in the described transmission window.
2, the mutual method of base station as claimed in claim 1 and user terminal information is characterized in that:
Step 2) and comprise step 4) between the step 3): calculate in the transmission window after renewal, send to same user terminal and receive the length of data package summation of user terminal confirmation; Judge whether described length summation takies thresholding greater than the user terminal buffer memory that presets,, otherwise carry out step 3) if greater than then carrying out step 5);
5) base station stops to issue the packet that sends in the window.
3, the mutual method of base station as claimed in claim 1 and user terminal information is characterized in that:
Step 2) and comprise step 4) between the step 3): calculate in the transmission window after renewal, send to same user terminal and receive the length of data package summation of user terminal confirmation; Whether the ratio of judging described data packet length summation and user terminal buffer memory capacity greater than this user terminal buffer memory occupancy thresholding that presets, if greater than then carrying out step 5), otherwise carries out step 3);
5) base station stops to issue the packet that sends in the window.
4, the mutual method of base station as claimed in claim 1 and user terminal information is characterized in that step 1) is specially:
11) if receive the affirmation information of user terminal, then judge currently receive whether the transmitting Sequence Number of packet of confirmation is not less than transmitting Sequence Number of current transmission window lower edge packet,, then carry out step 12) if be not less than, if do not do any variation, carry out step 3) less than then sending window;
12) judge whether timer is just monitoring the duration that packet exists in the current transmission window, if then carry out step 2); Otherwise carry out step 13);
13) timer picks up counting, and monitor to send to receive confirmation in the window and there is duration in the maximum packet that transmits Sequence Number in sending window, carry out step 2).
5, the mutual method of base station as claimed in claim 1 and user terminal information is characterized in that step 1) is specially:
11) if receive the affirmation information of user terminal, then judge currently receive whether the transmitting Sequence Number of packet of confirmation is not less than transmitting Sequence Number of current transmission window lower edge packet,, then carry out step 14) if be not less than, otherwise send window and do not do any variation, carry out step 3); Step 14): judge describedly currently receive whether the packet of confirmation is the lower edge of described transmission window, if then carry out step 15); Otherwise carry out step 12);
15) first does not receive the packet of confirmation after described transmission window lower edge being updated to the described current packet of receiving confirmation, carries out step 12);
12) judge whether timer is just monitoring the duration that packet exists in the current transmission window, if then carry out step 2); Otherwise carry out step 13);
13) timer picks up counting, and monitor to send to receive confirmation in the window and there is duration in the maximum packet that transmits Sequence Number in sending window, carry out step 2).
6, the mutual method of base station as claimed in claim 5 and user terminal information is characterized in that:
Judge by transmitting Sequence Number of comparing data bag in the step 14) and describedly currently receive whether the packet of confirmation is the lower edge of described transmission window.
7, the mutual method of base station as claimed in claim 1 and user terminal information is characterized in that:
Step 3) is for periodically sending the packet of not receiving the user terminal confirmation in the described transmission window.
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| CN101321378B (en) * | 2007-06-08 | 2012-05-09 | 中兴通讯股份有限公司 | Configuration method for reordering queue parameter in reinforced connection mode common state |
| CN101360262B (en) * | 2007-07-30 | 2012-02-08 | 大唐移动通信设备有限公司 | Control method and apparatus for sharing resource in communication system |
| CN105101293A (en) * | 2014-04-30 | 2015-11-25 | 夏普株式会社 | PDCP transmitting entity, secondary base station, user equipment and method thereof |
| CN112903124B (en) * | 2021-01-22 | 2022-09-06 | 安徽三联学院 | Low-voltage cabinet wired temperature detection system and method thereof |
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