CN100459578C - A method to acquire downlink data from upper network equipment by cell base station - Google Patents
A method to acquire downlink data from upper network equipment by cell base station Download PDFInfo
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- CN100459578C CN100459578C CNB2005101156751A CN200510115675A CN100459578C CN 100459578 C CN100459578 C CN 100459578C CN B2005101156751 A CNB2005101156751 A CN B2005101156751A CN 200510115675 A CN200510115675 A CN 200510115675A CN 100459578 C CN100459578 C CN 100459578C
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Abstract
The disclosed method for acquiring down data from up network device by Node B of BS comprises: A. Node B indicates sequence up and low threshold according to CQI returned by UE; and B. when the sequence length of down data of data buffer set by Node B less than the low threshold of UE sequence, Node B acquires the down data of UE from up network device; when the sequence length of down data of data buffer set by Node B over than the up threshold of UE sequence, Node B stops acquiring data.
Description
Technical field
The processing method of the downlink data in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system that the present invention relates to adopt the high-speed downstream bag to insert (HSDPA) technology, particularly a kind of cell base station (NodeB) obtains the method for downlink data from upper layer network equipment.
Background technology
HSDPA was incorporated in the third generation partnership projects version 5 (3GPP Release5) in 2002.Adopt the main feature of the WCDMA system of HSDPA technology to comprise: first, Node B is when subscriber equipment (UE) the transmission downlink data of giving by shared channel in the sub-district, employing Transmission Time Interval (TTI) is 2 milliseconds a frame, adopt mixed self-adapting repeat requests (HARQ) and Adaptive Modulation and Coding (AMC) technology in physical layer, introduce high order modulation (QAM) and improve the availability of frequency spectrum, realize the shared channel scheduling of each UE in the sub-district by sign indicating number branch and time-division.Second, employing stops waiting (SAW, Stop and Wait) agreement, when requiring Node B to send downlink data to the UE in the sub-district, need obtain UE feedback in the sub-district and acknowledge receipt of correct information/acknowledge receipt of incorrect information (ACK/NACK) really, still transmit new downlink data so that whether decision retransmits downlink data.The 3rd, adopt the AMC technology, the down channel quality indication (CQI) that requires the UE in the sub-district self to measure to Node B feedback, Node B is according to the CQI of the UE that receives, and definite descending sign indicating number resource and downlink power resources of distributing to UE sends downlink data.
Adopt the WCDMA system of HSDPA technology when sending downlink data, to increase high speed descending sharing channel (HS-DSCH), this HS-DSCH comprises two physical channels: one is High-Speed Shared Control Channel (HS-SCCH), is used to carry demodulation and follows the required signaling of high-speed physical downlink shared channel (HS-PDSCH) (HS-PDSCH); Another is HS-PDSCH, is used to carry the downlink data that sends to UE.Adopt the WCDMA system of HSDPA technology also to increase High-Speed Dedicated Physical Control Channel (HS-DPCCH), the downlink data that is used to carry the UE feedback receives the ACK/NACK and the CQI of correctness.
In order to realize UE the sharing in the sub-district to HS-DSCH, Node B is according to the descending sign indicating number resource and the downlink power resources of current area, and the CQI that reports of the UE in the sub-district, adopt relative fair scheduling algorithm, UE in the sub-district of determining to need to dispatch in each TTI, and, promptly distributing HS-DSCH to UE allocation of downlink sign indicating number resource and downlink power resources in the sub-district that will dispatch, transmission will send to the downlink data of the UE in the sub-district that will dispatch.
After Node B has distributed HS-DSCH to the UE in the sub-district, just can send downlink data for the UE in the sub-district by HS-DSCH.In Node B, exist high speed media access control (MAC-hs) entity, this entity has been set up data buffer area at the UE that in the sub-district each is carried on HS-DSCH, this data buffer area is used to store need give the downlink data of this UE transmission by HS-DSCH, and these downlink datas are with the form storage of formation.
At present, according to the flow control algorithm that is provided with, just can control upper layer network equipment, send downlink data at the some of the UE in the sub-district as radio network controller (RNC) to Node B, NodeB will store into from the downlink data that RNC receives the MAC-hs entity of Node B in should the data buffer area of UE.
Fig. 1 is the method flow diagram of prior art RNC to Node B transmission downlink data, and its concrete steps are:
Step 101, Node B obtain the downlink data of the data buffer area that is stored in this UE from the MAC-hs entity of Node B, send to this UE by HS-DSCH, and whether the downlink data queue length in the data buffer area of this UE of real-time judge is lower than the formation Lower Threshold for this UE configuration, if, execution in step 103; Otherwise, execution in step 102.
In the data buffer area that the MAC-hs entity that step 105, Node B store the downlink data of this UE of being received into Node B distributes to UE, whether the downlink data queue length in the data buffer area of this UE of real-time judge is higher than the formation Upper threshold for this UE configuration, if, execution in step 107; Otherwise, execution in step 106.
In the downlink data of this UE of storage, Node B also continues to obtain downlink data from the data buffer area of MAC-hs entity to the UE distribution of Node B, sends to this UE by HS-DSCH.
Fig. 2 obtains the downlink data request of this UE for the carrying of prior art or stops to obtain the form schematic diagram of control frame of the downlink data request of this UE, wherein, CmCH-PI represents Frame and the priority level of the Packet Data Unit (SDU) that will transmit, be total to 4bits, 0 expression lowest priority is other, and 15 expression limit priorities are other; Maximum MAC-d PDU Length represents maximum protocol Data Unit (PDU) size that allows, 13bits altogether; HS-DSCH Credits represents the number of the PDU that can transmit at a UE, altogether 11bits; HS-DSCH Interval represents the time interval of PDU transmission, can transmit the PDU number of Credits territory indication in the interbody spacer at this moment, altogether 8bits; HS-DSCHRepetion Period represents the Interval repetition period, is total to 8bits, and 0 expression is unlimited to be repeated; SpareExtension is an extension field, at present not definition.
When the downlink data request of this UE is obtained in the described control frame carrying of Fig. 2, fill the number of the downlink data of this UE that will obtain among the HS-DSCHCredits; When the described control frame carrying of Fig. 2 stops to obtain the downlink data request of this UE, fill 0 among the HS-DSCH Credits and get final product.
From the described scheme of Fig. 1 as can be seen, be that basis is determined to the capacity of the data buffer area of UE distribution and be maintained fixed constant for the quene threshold that is carried on the UE configuration on the HS-DSCH in the sub-district.This employing can not adapt to the wireless environment variation of WCDMA system and the mobility of the UE in the sub-district based on the fixing flow control algorithm of quene threshold.This be because, when if the quene threshold of configuration is smaller, and then will be fewer in the MAC-hs of Node B entity to the downlink data of UE storage, so when the channel circumstance of the current present position of UE is relatively good, just can not provide enough downlink datas to send to UE, cause the transmission rate of HS-DSCH to descend, reduced the capacity of WCDMA system; When if the quene threshold of configuration is bigger, and then it is many to the downlink data of UE storage in the MAC-hs of Node B entity, so when the channel circumstance of the current present position of UE is poor, will make a large amount of downlink data longer-term storage in the data buffer area that the MAC-hs of Node B entity distributes to UE, make the propagation delay time lengthening of Node B transmitting downlink data, influence the service quality of downstream data traffic, thereby cause the re-transmission of RNC wireless chain control layer (RLC) to increase, even generation RLC resets and call drop, in addition, when UE carries out the switching of minizone, a large amount of downlink data of storing in the data buffer area that will distribute to UE abandons, and causes the possibility of UE call drop to increase.
Further, in the WCDMA system that adopts Long Term Evolution (LTE) version, proposed the use Packet data service, Node B will store the downlink grouped data that sends from upper layer network equipment in the data storage area to the UE distribution.Adopting the WCDMA system of LTE version is two-forty and low time delay to the requirement that UE transmits downlink grouped data, yet present this employing can't satisfy the demands based on the fixing flow control algorithm of quene threshold: under the poor situation of the channel circumstance of the current present position of UE, can cause the congested of downlink grouped data and overflow; Perhaps under the reasonable situation of the channel circumstance of the current present position of UE, can not provide a large amount of downlink grouped datas, so that reduce the transmission rate that transmits downlink grouped data.
Therefore, how to make Node B different and from upper layer network equipment, obtain the downlink data of varying number according to the channel circumstance of the current present position of UE, promptly guarantee under the poor situation of the channel circumstance of the current present position of UE, can not cause the congested of downlink data and overflow, guarantee again under the reasonable situation of the channel circumstance of the current present position of UE, improve the transmission rate that transmits downlink data, become a problem demanding prompt solution.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of Node B to obtain the method for downlink data, and this method can make Node B obtain the downlink data of varying number according to the channel circumstance difference of the current present position of UE from upper layer network equipment.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of cell base station Node B obtains the method for downlink data from upper layer network equipment,, Node B sets in advance the channel quality indicator (CQI) rank of Lower Threshold in the user equipment (UE) formation in the respective cell, and this method comprises:
A, Node B receive one or more than one CQI of UE feedback and average in the time interval of setting, obtain average CQI, Node B determines that the average CQI that obtains belongs to the CQI rank of setting, with Lower Threshold in the UE formation of this CQI rank correspondence as Lower Threshold in the formation of this UE;
B, the queue length of downlink data during of giving the data buffer area storage that this UE distributes as Node B less than the formation Lower Threshold of this UE that is provided with, Node B obtains the downlink data of this UE from upper layer network equipment; The queue length of giving the downlink data in the data buffer area that this UE distributes as Node B is during greater than the formation Upper threshold of this UE that is provided with, and Node B stops to obtain from upper layer network equipment the downlink data of this UE.
The described time interval determines according to the channel quality of this current present position of UE, is one or more than one Transmission Time Interval TTI.
The described Node B of step B obtains the downlink data of this UE from upper layer network equipment process is:
The Node B layer network device that makes progress sends the downlink data request obtain this UE, and upper layer network equipment sends the downlink data of this UE for Node B.
Described downlink data request of obtaining this UE is carried on the control frame, and this control frame comprises: the CmCH-PI of the priority level of the expression Frame and the Packet Data Unit SDU that will transmit; The Maximum Upper layer PDU Length of the maximum protocol Data Unit PDU size that allows of expression; Expression is at the Credits of the number of the PDU of a UE transmission; The Interval in the time interval of expression PDU transmission; Repetion Period and the extension field SpareExtension of expression Interval repetition period.
The process that the described Node B of step B stops to obtain from upper layer network equipment the downlink data of this UE is:
The Node B layer network device that makes progress sends the downlink data request stop to obtain this UE, and upper layer network equipment stops to send the downlink data of this UE to Node B.
The described request that stops to obtain the downlink data of this UE is carried on the control frame, and this control frame comprises: the CmCH-PI of the priority level of the expression Frame and the Packet Data Unit SDU that will transmit; The Maximum Upper layer PDU Length of the maximum protocol Data Unit PDU size that allows of expression; Expression is at the Credits of the number of the PDU of a UE transmission; The Interval in the time interval of expression PDU transmission; Repetion Period and the extension field SpareExtension of expression Interval repetition period.
Fill 0 among the described Credits.
Described upper layer network equipment is radio network controller (RNC).
From such scheme as can be seen, Node B of the present invention sets the quene threshold of this UE according to the CQI of the feedback of the UE in the sub-district, because the CQI of the feedback of the UE in the sub-district can reflect the channel circumstance quality of the current position of user and the load state of sub-district, thereby the quene threshold that makes Node B be provided with for this UE according to CQI can effectively carry out the downlink data Flow Control between upper layer network equipment and the Node B, make when downlink data is dispatched in Node B more effectively and rationally, save the propagation delay time of downlink data and the efficiency of transmission that improves downlink data.Therefore, method provided by the invention makes NodeB obtain the downlink data of varying number according to the channel circumstance difference of the current present position of UE from upper layer network equipment, promptly guarantee under the poor situation of the channel circumstance of the current present position of UE, can not cause the congested of downlink data and overflow, guarantee again under the reasonable situation of the channel circumstance of the current present position of UE, improve the transmission rate that transmits downlink data.
Description of drawings
Fig. 1 is prior art RNC sends a method flow diagram from downlink data to Node B.
Fig. 2 obtains the downlink data request of this UE for the carrying of prior art or stops to obtain the form schematic diagram of control frame of the downlink data request of this UE.
Fig. 3 is provided with other schematic diagram of CQI level for the present invention.
Fig. 4 obtains the method flow diagram of downlink data for Node B of the present invention.
Fig. 5 obtains the downlink data request of this UE for carrying of the present invention or stops to obtain the form schematic diagram of control frame of the downlink data request of this UE.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.
In order to make Node B different and from upper layer network equipment, obtain the downlink data of varying number according to the channel circumstance of the current present position of UE, both guaranteed under the poor situation of the channel circumstance of the current present position of UE, can not cause the congested of downlink data and overflow, guarantee again under the reasonable situation of the channel circumstance of the current present position of UE, improve the transmission rate that transmits downlink data, the CQI that Node B of the present invention reports according to the UE in the sub-district sets the quene threshold of this UE, because the CQI that the UE in the sub-district reports can reflect the channel circumstance quality of the current present position of UE, thereby the quene threshold of this UE that sets can carry out the flow control of the downlink data between upper layer network equipment and the Node B effectively.
The process that the CQI that Node B of the present invention reports according to the UE in the sub-district sets the quene threshold of this UE is:
At first, in Node B, set in advance the rank of CQI, the corresponding quene threshold of each CQI rank, this quene threshold comprises formation Upper threshold and formation Lower Threshold.
Other number of CQI level that is provided with is determined according to actual conditions, as C1 and two other CQI of level of C2 is set.Lower Threshold is ThU1 and ThD1 on the C1 corresponding queues, and Lower Threshold is ThU2 and ThD2 on the C2 corresponding queues.The CQI rank that Node B is provided with is high more, and corresponding queues Upper threshold and formation Lower Threshold are also high more.
Secondly, in Node B, the T that sets interval, this time interval T can determine according to actual conditions, and can adjust in real time.In the time interval T that is provided with, receive a plurality of CQI of the UE feedback in the sub-district, and a plurality of CQI are averaged, C averages.
For example: Node B can be set to a TTI when setting interval T to the UE in the sub-district for the first time, then obtain a CQI of the UE feedback in the sub-district at this time interval T, thereby the C that averages just equals the CQI of the UE feedback in the sub-district.
Node B also can adjust the time interval T of this setting according to the mean value C in the last time interval T.Bigger as the mean value C that in a last time interval T, obtains, as mean value greater than setting, the channel quality that then reflects this current present position of UE is relatively good, this time interval T can be provided with greatlyyer, as is set to predefined several TTI; The mean value C that obtains in a last time interval T is smaller, as less than the mean value of setting, reflects that then the channel quality of this current present position of UE is poor, this time interval T can be provided with smallerly, but the minimum value that is provided with is a TTI.
At last, Node B determines the CQI rank in this time interval T of the mean value C correspondence that calculates according to predefined CQI rank, thereby determine this CQI rank corresponding queues thresholding, this quene threshold be exactly Node B in this time interval T at quene threshold that this UE adopted.
For example, the mean value C that calculates belongs to C1, and then threshold value is respectively ThU1 and ThD1 about the formation of She Zhiing; The mean value C that calculates belongs to C2, and then threshold value is respectively ThU2 and ThD2 about the formation of She Zhiing.
Node B of the present invention sets the size of the data buffer area that the formation Upper threshold in the quene threshold of this UE distributes to UE smaller or equal to Node B according to the CQI of the UE in sub-district feedback.
Fig. 3 is provided with other schematic diagram of CQI level for the present invention, and as shown in the figure: axis of abscissas is time (Time) axle, and axis of ordinates is the CQI axle, and the UE in the curve representation sub-district is at the CQI change curve of different time feedback.C1 and C2 represent two ranks of CQI respectively, CQI1, CQIn, CQIm and CQIk are illustrated respectively on the end point of the starting point of starting point, time interval T3 of starting point, the time interval T2 of time interval T1 and time interval T3, the CQI value of the UE feedback in the sub-district.
Fig. 4 is the method flow diagram that Node B of the present invention obtains downlink data, and its concrete steps are:
Upper layer network equipment of the present invention can be RNC, the Access Network of other support Packet data service or the equipment in the core net.
The present invention T that sets interval, and calculate CQI mean value in time interval T, draw the CQI variation tendency of the UE in the sub-district thus, not influenced by the moment CQI of the UE in the sub-district.The present invention makes that by dynamically adjusting the quene threshold of UE the Flow Control between upper layer network equipment and the Node B is more effective.
Fig. 5 obtains the downlink data request of this UE for carrying of the present invention or stops to obtain the form schematic diagram of control frame of the downlink data request of this UE.Wherein, CmCH-PI represents Frame and the priority level of the SDU that will transmit, 4bits altogether, and 0 expression lowest priority is other, and 15 expression limit priorities are other; Maximum Upper layer PDU Length represents the maximum PDU size that allows, 13bits altogether; Credits represents the number of the PDU that can transmit at a UE, altogether 11bits; Interval represents the time interval of PDU transmission, can transmit the PDU number of Credits territory indication in the interbody spacer at this moment, altogether 8bits; Repetion Period represents the Interval repetition period, is total to 8bits, and 0 expression is unlimited to be repeated; Spare Extension is an extension field, at present not definition.
Because Node B of the present invention will obtain downlink data from upper layer network equipment, be the size of upper strata PDU (Upper layerPDU) and the number of Upper layer PDU so PDU size of indicating in this control frame and PDU number indicate respectively.
When the downlink data request of this UE is obtained in the described control frame carrying of Fig. 5, fill the number of the downlink data of this UE that will obtain among the Credits; When the described control frame carrying of Fig. 5 stops to obtain the downlink data request of this UE, fill 0 among the Credits and get final product.
When moving to cell edge gradually, the UE in the sub-district takes place in the handoff procedure of minizone, this UE its CQI that records of feedback in real time will diminish gradually, Node B also can reduce gradually according to the quene threshold value that CQI sets, thereby make and be stored in Node B and also can reduce for the downlink data quantity in the data buffer area that this UE distributes, if switch, Node B also can reduce than the method that adopts prior art to provide greatly at the quantity of the downlink data that this UE abandons.
Load when the sub-district increases, perhaps because the increase of the UE number in the sub-district, make the resulting dispatcher of each UE can be when reducing, for the UE in the sub-district, because cell load increases, in real time its CQI that records of feedback will diminish, and Node B also can reduce according to the quene threshold value that CQI sets, and is stored in Node B and reduces for the downlink data quantity in the data buffer area that this UE distributes thereby make.Like this, the time that the downlink data of this UE is detained in Node B just can be shortened, and can not cause overflowing and losing of downlink data.
UE in the sub-district moves to center of housing estate, perhaps the load of sub-district reduces, perhaps the channel circumstance of this current present position of UE improves, its CQI that records that this moment, this UE fed back in real time will become big, Node B also can raise according to the quene threshold value that CQI sets, thereby make to be stored in Node B and also can to increase for the downlink data quantity in the data buffer area that this UE distributes, guaranteed that Node B has enough downlink datas to send to this UE, improve the downlink data transmission rate of this UE.
The CQI of the UE feedback in the sub-district can reflect the channel circumstance quality of the current position of user and the load state of sub-district, thereby the quene threshold that makes Node B be provided with for this UE according to CQI can effectively carry out the downlink data Flow Control between upper layer network equipment and the Node B, make when downlink data is dispatched in Node B more effectively and rationally, save the propagation delay time of downlink data and the efficiency of transmission that improves downlink data.
Further, method provided by the invention also can satisfy downlink grouped data is transmitted in the WCDMA system that adopts the LTE version to UE two-forty and low delay requirement.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of cell base station Node B obtains the method for downlink data from upper layer network equipment, it is characterized in that, Node B sets in advance the channel quality indicator (CQI) rank of Lower Threshold in the user equipment (UE) formation in the respective cell, and this method comprises:
A, Node B receive one or more than one CQI of UE feedback and average in the time interval of setting, obtain average CQI, Node B determines that the average CQI that obtains belongs to the CQI rank of setting, with Lower Threshold in the UE formation of this CQI rank correspondence as Lower Threshold in the formation of this UE;
B, the queue length of downlink data during of giving the data buffer area storage that this UE distributes as Node B less than the formation Lower Threshold of this UE that is provided with, Node B obtains the downlink data of this UE from upper layer network equipment; The queue length of giving the downlink data in the data buffer area that this UE distributes as Node B is during greater than the formation Upper threshold of this UE that is provided with, and Node B stops to obtain from upper layer network equipment the downlink data of this UE.
2, the method for claim 1 is characterized in that, the described time interval determines according to the channel quality of this current present position of UE, is one or more than one Transmission Time Interval TTI.
3, the method for claim 1 is characterized in that, the described Node B of step B obtains the downlink data of this UE from upper layer network equipment process is:
The Node B layer network device that makes progress sends the downlink data request obtain this UE, and upper layer network equipment sends the downlink data of this UE for Node B.
4, method as claimed in claim 3 is characterized in that, described downlink data request of obtaining this UE is carried on the control frame, and this control frame comprises: the CmCH-PI of the priority level of the expression Frame and the Packet Data Unit SDU that will transmit; The Maximum Upper layer PDU Length of the maximum protocol Data Unit PDU size that allows of expression; Expression is at the Credits of the number of the PDU of a UE transmission; The Interval in the time interval of expression PDU transmission; Repetion Period and the extension field Spare Extension of expression Interval repetition period.
5, the method for claim 1 is characterized in that, the process that the described Node B of step B stops to obtain from upper layer network equipment the downlink data of this UE is:
The Node B layer network device that makes progress sends the downlink data request stop to obtain this UE, and upper layer network equipment stops to send the downlink data of this UE to Node B.
6, method as claimed in claim 5 is characterized in that, the described request that stops to obtain the downlink data of this UE is carried on the control frame, and this control frame comprises: the CmCH-PI of the priority level of the expression Frame and the Packet Data Unit SDU that will transmit; The Maximum Upper layer PDU Length of the maximum protocol Data Unit PDU size that allows of expression; Expression is at the Credits of the number of the PDU of a UE transmission; The Interval in the time interval of expression PDU transmission; Repetion Period and the extension field Spare Extension of expression Interval repetition period.
7, method as claimed in claim 6 is characterized in that, fills 0 among the described Credits.
8, the method for claim 1 is characterized in that, described upper layer network equipment is radio network controller (RNC).
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| CN101420288B (en) * | 2007-10-26 | 2011-12-07 | 中兴通讯股份有限公司 | Channel quality monitoring method for high-speed downlink packet access service |
| CN101442774B (en) * | 2007-11-21 | 2012-06-27 | 华为技术有限公司 | Method, equipment and system for distributing feedback channel with single district transmission mode |
| CN105578530A (en) * | 2014-10-17 | 2016-05-11 | 中兴通讯股份有限公司 | Flow control method and device and base station |
| CN107682893A (en) * | 2017-10-18 | 2018-02-09 | 中国联合网络通信集团有限公司 | A kind of jamming control method and equipment of UDP business |
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| CN1533105A (en) * | 2003-03-26 | 2004-09-29 | �ձ�������ʽ���� | Radio communication syste, base station and method for correcting radio link quality information |
| EP1492263A1 (en) * | 2003-06-27 | 2004-12-29 | Kabushiki Kaisha Toshiba | Radio communication apparatus and communication mode control method of a mobile communication system |
| CN1852571A (en) * | 2005-09-07 | 2006-10-25 | 上海华为技术有限公司 | High-speed downward grouped access-in flow control method |
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| WO2004049599A1 (en) * | 2002-11-28 | 2004-06-10 | Matsushita Electric Industrial Co., Ltd. | Base station device and adaptive modulation method |
| CN1533105A (en) * | 2003-03-26 | 2004-09-29 | �ձ�������ʽ���� | Radio communication syste, base station and method for correcting radio link quality information |
| EP1492263A1 (en) * | 2003-06-27 | 2004-12-29 | Kabushiki Kaisha Toshiba | Radio communication apparatus and communication mode control method of a mobile communication system |
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