CN100459607C - Ground wireless access network flow control method for general mobile communication system - Google Patents

Ground wireless access network flow control method for general mobile communication system Download PDF

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CN100459607C
CN100459607C CNB031542654A CN03154265A CN100459607C CN 100459607 C CN100459607 C CN 100459607C CN B031542654 A CNB031542654 A CN B031542654A CN 03154265 A CN03154265 A CN 03154265A CN 100459607 C CN100459607 C CN 100459607C
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media interviews
macc
amount
controlled
data
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CN1581747A (en
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邱华
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The disclosed UTRAN method of flow control being as scheme for realizing FACH function of controlling upflow includes following steps: (1) when MACD cycle timer is overtime, MACD determines whether there is a condition that data quantity to be sent in certain priority is not equal to zero, but MACC assigns available data quantity to be sent for the priority is equal to zero; (2) MACC records data quantity to be sent; (3) when MACC cycle timer is overtime, MACC determines whether data quantity in buffer area of each priority is less than threshold; if yes, assigning free capacity of the buffer area to MACD instances, whose data quantities to be sent are not equal to zero; (4) MACC sends message of flow distribution to MACD; (5) MACD responds message of flow distribution, sends PDU too MACC according to available data quantity to be sent; (6) MACC recording data quantity to be sent.

Description

Universal mobile telecommunications system grounding wireless access network flow control methods
Technical field
The present invention relates to the wireless communications traffic control method, particularly universal mobile telecommunications system grounding wireless access network forward access channel flow control methods.
Background technology
Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access is called for short " WCDMA ") is one of global at present three kinds of main 3G (Third Generation) Moblies (The Third Generation is called for short " 3G ") system.As shown in Figure 1, the WCDMA system is made up of three parts, be core net (Core Net, abbreviation " CN "), universal mobile telecommunications system grounding wireless access network (UMTSTerrestrial Radio Access Network, be called for short " UTRAN ") and subscriber equipment (UserEquipment is called for short " UE ") composition.The interface definition of CN and UTRAN is the Iu interface, and the interface definition of UTRAN and UE is the Uu interface.
Comprise many RNSs (RadioNetwork Subsystem is called for short " RNS ") that are connected to CN by the Iu interface among the UTRAN again.A RNS comprises a radio network controller (Radio Network Controller is called for short " RNC ") and one or more base station (Node B).Node B is connected on the RNC by Iub interface.Each Node B comprises one or more sub-districts.In UTRAN inside, the RNC among each RNS can pass through Iur interactive interfacing information, and the Iur interface can be the directly continuous of physics between the RNC or pass through suitable transmission network and realize.The UTRAN structure as shown in Figure 2.
RNC among the UTRAN can be divided into control radio network controller (Controlling Radio Network Controller again according to logic function, abbreviation " CRNC "), service wireless network controller (Serving Radio Network Controller, be called for short " SRNC ") and floating radio network controller (Drift Radio Network Controller is called for short " DRNC ").
The UTRAN transmission channel is the channel that transmits data between the peer layer of layer 1 that physical layer provides layer 2.Transmission channel can be divided into common signal channel (CommonChannel according to data transmission manner, be called for short " CCH ") and dedicated channel (Dedicate Channel, be called for short " DCH "), wherein CCH comprises: Random Access Channel (Random Access CHannel, be called for short " RACH "), forward access channel (Forward Access Channel, be called for short " FACH "), paging channel (PagingChannel, be called for short " PCH "), DSCH Downlink Shared Channel (Downlink Shared Channel, be called for short " DSCH ") and CPCH (Common Packet Channel is called for short " CPCH ").
At third generation partner program (3rd Generation Partnership Project, abbreviation " 3GPP ") just described on the FACH in the agreement flow control should have been arranged, purpose is in order to reduce the time delay of signaling, and when FACH takes place to reduce the re-transmission of data when congested and abandon, but how do not describe this function in agreement realizes.
The flow control function of FACH is that realize media interviews control (MediumAccess Control is called for short " the MAC ") sublayer at radio interface layer 2.Radio interface layer 2 is made up of 4 sublayers such as media access control sublayer and Radio Link control (Radio Link Control is called for short " RLC ") sublayers.
Wherein, MAC mainly finishes in several biography processes logic channel to the mapping of transmission channel, and finishes the function that the part Radio Resource is reshuffled and measured under the indication of chain of command.Mac-layer protocol can be subdivided into media interviews and control public part (Media Access Control Common, be called for short " MACC ") and media interviews control private part (Media Access Control Dedicate, be called for short " MACD "), MACC is corresponding with the sub-district, and there is a MACC example sub-district.MACD is corresponding with UE, and a UE has a MACD example.
RLC mainly provides transparent, non-affirmation and confirms the transfer of data of three kinds of patterns, corresponds respectively to different several mass transfer amount requirements, and wherein affirmation mode provides sliding window mechanism to guarantee the error-free transmission of data.
Can see when SRNC separates with CRNC that in the TS25.425 of 3GPP agreement it is as follows that FACH goes up flow control process on the Iur interface:
1. have the data of certain priority to send and DRNC when not having dispense flow rate as SRNC, SRNC will be to DRNC transmitted traffic application control frame with application FACH flow;
2.DRNC according to this priority traffic dispense flow rate that the assignment of traffic algorithm is given SRNC, transmitted traffic notice control frame is given and is seen SRNC then;
3.SRNC the flow according to distributing sends corresponding FACH Frame to DRNC.
In Fig. 3, provided the schematic diagram of flow control process on the above-mentioned FACH.
What describe in the agreement is FACH flow control process when SRNC separates with CRNC, and at this moment MACC is positioned at DRNC, and MACD is arranged in SRNC.The technical staff who is familiar with field of the present invention will appreciate that, can adopt the flow control when realizing in the same way that SRNC does not separate with CRNC.
The main body of finishing the FACH flow is MACC, and MACD will cooperate MACC to finish flow control process.The last flow control process of FACH mainly is the flow control process between MACC and the MACD.
To go up flow control relevant with FACH, can illustrate its latest development situation part 3GPP list of references as follows:
3GPP?TS?25.401,《UTRAN?overall?description?v3.6.0》;
3GPP?TS?25.301,《Radio?Interface?Protocol?Architecture?v3.8.0》;
3GPP?TS?25.321,《MAC?Protocol?Specification?v3.7.0》;
3GPP?TS?25.427,《UTRAN?Iur?and?Iub?user?plane?protocol?for?DCH?datastreams?v3.6.0》;
3GPP?TS?25.435,《UTRAN?Iub?interface?user?plane?protocol?for?CCHdata?streams?v3.6.0》。
In actual applications, there is following problem in such scheme: do not propose in the 3GPP agreement to realize that FACH goes up the concrete scheme of flow control function, on other open source literatures, do not realize the concrete scheme of flow control function on the FACH yet, and present those of ordinary skill can not realize that by the non-creativeness work FACH goes up flow control function only according to the simple description of in the 3GPP agreement FACH being gone up flow control function as yet.
Cause a main cause of this situation to be, disclosed FACH goes up flow control methods and does not provide answer for following major issue in the TS25.425 agreement of 3GPP:
1) do you how to determine rational flow allocation method?
2) among the MACC data buffer zone be set to much suitable?
Is 3) frequency of flow control much suitable?
Summary of the invention
The technical problem to be solved in the present invention provides a kind of universal mobile telecommunications system grounding wireless access network flow control methods, and making the FACH that mentions in the 3GPP agreement go up flow control function has had concrete implementation.
In order to solve the problems of the technologies described above, the invention provides a kind of universal mobile telecommunications system grounding wireless access network flow control methods, comprise following steps:
A is in the media interviews control private part overtime moment of cycle timer, it is not 0 and media interviews are controlled public part to give the data volume sent out of described common signal channel priority assignment be 0 situation that media interviews control private part judges whether to exist the outgoing data amount of common signal channel priority correspondence, sends to described media interviews in the flow solicitation message and controls public part if then outgoing data amount information is placed on;
After the described media interviews of B are controlled public part and received described flow solicitation message, write down described outgoing data amount;
C controls public partial periodicity moment of time-out of timer in media interviews, described media interviews are controlled public part and are judged that whether data volume in each common signal channel priority buffering area is less than predefined thresholding, if then with the difference of current data amount in described buffering area total capacity and the described buffering area amount to be allocated as this common signal channel priority, be not to distribute described amount to be allocated between each media interviews control private part example of 0 in the outgoing data amount, and obtain to send out data volume according to allocation result;
The described media interviews of D are controlled public part the described data volume of sending out are sent to described media interviews control private part by assignment of traffic message;
The described media interviews control of E private part responds described assignment of traffic message, control public part transmission media interviews control private part protocol Data Unit by data transfer messages to described media interviews according to the described data volume of sending out, comprise all the other the outgoing data amount information except that the described media interviews control private part protocol Data Unit that is sent out in the described data transfer messages;
The described data transfer messages of public partial response is controlled in the described media interviews of F, writes down the outgoing data amount that comprises in the described data transfer messages.
Wherein, in described step C, it is not to distribute the step of described amount to be allocated also to comprise following substep between each media interviews control private part example of 0 in the outgoing data amount that public part is controlled in described media interviews:
The described media interviews of C1 are controlled public part media interviews control private part examples all in the described common signal channel priority are put in the formation; The described media interviews of C2 are controlled public part and are selected to come the primary media interviews control of described formation private part example, according to the outgoing data amount of the primary media interviews control of described formation private part example described amount to be allocated are distributed to the primary media interviews control of described formation private part example; Public part is controlled in the described media interviews of C3 will be assigned with the described example of described amount to be allocated first last position that moves to described formation from described formation; The described media interviews of C4 are controlled public part and are judged whether to remain in addition amount to be allocated and also have media interviews control private part example not to be assigned with described amount to be allocated, if then enter step C2, otherwise finish to distribute.
In described universal mobile telecommunications system grounding wireless access network, main buffer point is arranged on wireless chain control layer, controls in described media interviews the less working buffer of capacity only is set in the public part.
The buffer pool size that public part is controlled in described media interviews is the size that can hold several Transmission Time Interval data.
Described media interviews are controlled the buffer pool size of public part and can restriction and the performance according to hardware be adjusted in implementation process.
By relatively finding, technical scheme difference with the prior art of the present invention is, MACD is at cycle timer time-out period not, check the outgoing data amount of each common signal channel priority correspondence, if outgoing data is arranged but the common signal channel priority of unallocated flow among the MACC, then to MACC transmitted traffic solicitation message; MACC collects and writes down the outgoing data amount of each common signal channel priority; When cycle timer is overtime, MACC judges that whether the data number of each common signal channel priority buffering area is less than predefined thresholding, if then described buffering area total capacity is deducted the number of current data in the described buffering area, obtaining the amount to be allocated of this common signal channel priority, is not to distribute between 0 media interviews control private part example described amount to be allocated in the outgoing data amount then; Subsequently, MACC is to MACD transmitted traffic assignment messages.
In UTRAN, main buffer point is arranged on rlc layer in addition, the less working buffer of capacity only is set in MACC.
Difference on this technical scheme has brought comparatively significantly beneficial effect, and promptly those of ordinary skill can need not creative work and can realize that FACH goes up flow control function with reference to flow control methods proposed by the invention.This method proves real system in service that the service quality (Quality of Service is called for short " QoS ") of feasible and satisfied business requires.
Description of drawings
Fig. 1 is a WCDMA system configuration schematic diagram;
Fig. 2 is the UTRAN structural representation;
Fig. 3 is that Iur interface FACH goes up the flow control process schematic diagram;
Fig. 4 is a UTRAN flow control methods flow chart according to an embodiment of the invention;
Fig. 5 is the rotation distribution method flow chart of buffer pool size to be allocated according to an embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 4, in step 100, in the overtime moment of MACD cycle timer, MACD checks the data volume of each common signal channel priority correspondence.The one-period timer is respectively arranged in MACC and MACD, and every one section preset time (i.e. " cycle "), cycle timer can trigger once overtime incident.
The data that MACD sends to MACC are according to the common signal channel priority classification, and each data to be sent all has a common signal channel priority, the sending order that MACC is different to different The data according to the value of common signal channel priority.The benefit of doing like this is that data of different types can be sent by multiplexing same passage, can make important data on the other hand, and signaling for example can prioritised transmission.In MACC, all there is one to send buffering area corresponding to each common signal channel priority, deposit corresponding buffering area in by common signal channel priority earlier from the data of MACD, successively send according to certain rule then.
After this enter step 110, MACD judge whether to exist certain common signal channel priority outgoing data amount be not 0 and MACC to give the data volume sent out of described common signal channel priority assignment be 0 situation, if then enter step 120, otherwise do not deal with, directly enter step 140.Owing to can send out data volume is dynamically to adjust according to the situation of each common signal channel priority outgoing data amount, therefore certain the common signal channel priority outgoing data amount among the MACD of might occurring be not 0 and MACC to give the data volume sent out of described common signal channel priority assignment be 0 situation, for example some common signal channel priority never data transmission in a period of time among the MACD, MACC may be decided to be 0 with the data volume sent out of this common signal channel priority, but burst service has at a time produced some data that belong to this common signal channel priority, need to send, will have outgoing data this moment but can send out data volume is 0 situation.
In step 120, MACD is placed on the outgoing data amount in the special flow solicitation message and sends, and after this enters step 140.
In the ordinary course of things, how many MACC comes can send out data volume for each common signal channel priority assignment by weighing each common signal channel priority height and outgoing data amount.In the ordinary course of things, MACD attaches the outgoing data amount sending and sends to MACC in the protocol Data Unit data transmission message of (Protocol Data Unit is called for short " PDU ") together, and MACC is known outgoing data amount among the MACD thus.But when MACC is 0 for the data volume sent out of certain common signal channel priority assignment, the outgoing data amount of this common signal channel priority can't be attached in data transmission message and be sended over together among the MACD, therefore must apply for flow to MACC by the special flow solicitation message in the step 120.
In step 140, after MACC receives described flow solicitation message, write down the outgoing data amount of each priority.The record of outgoing data amount is that MACC carries out the main foundation that flow is adjusted.
Enter step 150 subsequently, when cycle timer was overtime, MACC judged that data volume in each common signal channel priority buffering area whether less than predefined thresholding, if then enter step 160, otherwise enters step 170.The purpose of setting up thresholding is in order not waste the FACH bandwidth.If because do not set thresholding, just carry out Flow Control when not had data in the buffer memory but wait, because it is the needs certain hours that MACD sends data to MACC according to flow indication, therefore MACC may be at next TTI (Transmission Time Interval, Transmission Time Interval, on FACH, send the moment of data for MACC at this) just there are not data to send the untimely waste that just causes the FACH bandwidth of Flow Control like this.Threshold value can rule of thumb be set also can be according to the FACH bandwidth settings.
In step 160, MACC deducts current data amount in the described buffering area with described buffering area total capacity, obtains the amount to be allocated of this common signal channel priority, with described amount to be allocated in the outgoing data amount is not then to distribute between 0 MACD example.After assigning, described amount to be allocated just obtained the data volume sent out of each MACD example in each common signal channel priority.After this enter step 170.
The MACD example is corresponding with UE, MACD example of a UE.The method that described amount to be allocated is distributed has multiple, in a preferred embodiment of the present invention, adopts the rotation distribution method, and as shown in Figure 5, its idiographic flow is as follows:
In step 210, MACC puts MACD examples all in the described common signal channel priority in the formation into.Using the purpose of formation is to utilize the characteristic of its first in first out.
After this enter step 220, MACC selects to come the primary MACD example of formation, and described amount to be allocated is distributed to described example as much as possible.For example the amount to be allocated of certain common signal channel priority is 19, is 15 and come the total outgoing data amount of the primary MACD example of formation, then amount to be allocated is satisfied as far as possible to also have 4 residue behind this example.
After this enter step 230, MACC will be assigned with the MACD example of amount to be allocated first last position that moves to formation from formation.Distribute because realize rotation, the therefore MACD example that had been assigned with can distribute after will waiting one to take turns end for the second time, and the purpose of doing like this is the justice that guarantees each MACD example.
After this enter step 240, MACC judges whether to remain in addition amount to be allocated and also has the MACD example not to be assigned with amount to be allocated, if then enter step 220, distributes once more, otherwise finishes to distribute.
In step 170, MACC wherein has this MACD and can send out data volume to MACD transmitted traffic assignment messages.
After this enter step 180, MACD response traffic assignment messages according to sending out data volume by the PDU of data transfer messages to MACC transmission MACD, comprises all the other the outgoing data amount information except that the PDU of the MACD that is sent out in this data transfer messages.
After this enter step 190, the MACC response data transmits message, and record data transmit the outgoing data amount that comprises in the message.
By top explanation to flow control method, the technical staff who is familiar with field of the present invention will appreciate that the FACH data buffer zone size of MACC and the frequency of flow control are inversely proportional to, and buffering area is big more, and the frequency of Flow Control is just little.But the excessive measuring business volume that will cause of buffering area is inaccurate, and the status report of RLC can not in time send.In addition, the buffering of MACC can not be provided with too smallly, and too small meeting makes the Flow Control frequency increase, and the Flow Control size of message increases, if data can not in time be sent to MACC, can cause the waste of FACH bandwidth simultaneously.
In addition, can find out also that it also is to need to consider that the cycle of Flow Control is set from the description of front.Cycle is too little as if what set, may cause before the next Flow Control cycle arrives, and MACD does not deliver to MACC with data.Therefore still be lower than buffer threshold owing to data volume in next Flow Control during the cycle, so MACC continues to the MACD dispense flow rate.And data that at this moment might MACD after MACD receives second Flow Control message, if really have data to send out again, then send to MACC with new data on the road of transmitting.Therefore MACD sends to the data total amount of MACC, is not that MACC is desired in fact, may cause the MACC buffer memory to overflow like this, abandons data.
Certainly the cycle is set too greatly, can cause Flow Control untimely, finally causes the waste of FACH bandwidth.
Eventually the above, the setting of the Flow Control cache size of the Lower Threshold of Flow Control, MACC, Flow Control cycle three parameters is very important, they are associated with each other, determine the performance of flow control algorithm jointly.
In a preferred embodiment of the present invention, the main buffer point of data is placed on RLC, and the buffering of MACC is a working buffer, is provided with lessly, for example only deposits the data of several TTI, but will guarantee the bandwidth requirement of FACH.In realization, can adjust buffer size, for example when system debug, adjust according to hardware constraints and performance (signaling, data delay) etc.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.

Claims (5)

1. a universal mobile telecommunications system grounding wireless access network flow control methods is characterized in that, comprises following steps:
A is in the media interviews control private part overtime moment of cycle timer, it is not 0 and media interviews are controlled public part to give the data volume sent out of described common signal channel priority assignment be 0 situation that media interviews control private part judges whether to exist the outgoing data amount of common signal channel priority correspondence, sends to described media interviews in the flow solicitation message and controls public part if then outgoing data amount information is placed on;
After the described media interviews of B are controlled public part and received described flow solicitation message, write down described outgoing data amount;
C controls public partial periodicity moment of time-out of timer in media interviews, described media interviews are controlled public part and are judged that whether data volume in each common signal channel priority buffering area is less than predefined thresholding, if then with the difference of current data amount in described buffering area total capacity and the described buffering area amount to be allocated as this common signal channel priority, be not to distribute described amount to be allocated between each media interviews control private part example of 0 in the outgoing data amount, and obtain to send out data volume according to allocation result;
The described media interviews of D are controlled public part the described data volume of sending out are sent to described media interviews control private part by assignment of traffic message;
The described media interviews control of E private part responds described assignment of traffic message, control public part transmission media interviews control private part protocol Data Unit by data transfer messages to described media interviews according to the described data volume of sending out, comprise all the other the outgoing data amount information except that the described media interviews control private part protocol Data Unit that is sent out in the described data transfer messages;
The described data transfer messages of public partial response is controlled in the described media interviews of F, writes down the outgoing data amount that comprises in the described data transfer messages.
2. universal mobile telecommunications system grounding wireless access network flow control methods according to claim 1, it is characterized in that, among the described step C, it is not to distribute the step of described amount to be allocated also to comprise following substep between each media interviews control private part example of 0 in the outgoing data amount that public part is controlled in described media interviews:
The described media interviews of C1 are controlled public part media interviews control private part examples all in the described common signal channel priority are put in the formation;
The described media interviews of C2 are controlled public part and are selected to come the primary media interviews control of described formation private part example, according to the outgoing data amount of the primary media interviews control of described formation private part example described amount to be allocated are distributed to the primary media interviews control of described formation private part example;
Public part is controlled in the described media interviews of C3 will be assigned with the described example of described amount to be allocated first last position that moves to described formation from described formation;
The described media interviews of C4 are controlled public part and are judged whether to remain in addition amount to be allocated and also have media interviews control private part example not to be assigned with described amount to be allocated, if then enter step C2, otherwise finish to distribute.
3. universal mobile telecommunications system grounding wireless access network flow control methods according to claim 1, it is characterized in that, in described universal mobile telecommunications system grounding wireless access network, main buffer point is arranged on wireless chain control layer, controls in described media interviews the less working buffer of capacity only is set in the public part.
4. universal mobile telecommunications system grounding wireless access network flow control methods according to claim 3 is characterized in that, the buffer pool size that public part is controlled in described media interviews is the size that can hold several Transmission Time Interval data.
5. universal mobile telecommunications system grounding wireless access network flow control methods according to claim 3 is characterized in that, described media interviews are controlled the buffer pool size of public part and can restriction and the performance according to hardware be adjusted in implementation process.
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CN101370308B (en) * 2005-05-26 2011-03-30 华为技术有限公司 Method for implementing channel priority level scheduling and business priority scheduling
CN1885826B (en) * 2006-07-03 2011-02-16 华为技术有限公司 Data transmission method for high-speed downlink packet access service
CN101754375B (en) * 2008-12-12 2012-09-05 大唐移动通信设备有限公司 Data issuing method and system
CN101965013B (en) * 2009-07-23 2014-07-16 中兴通讯股份有限公司 Dynamic traffic control drive device, base station and method
CN114172952A (en) * 2021-11-12 2022-03-11 杭州房象网络科技有限公司 Multi-site service data distribution method, system, equipment and medium

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