CN1787453A - Method for controlling Iur interface forward cut-in channel flow based on predistributing policy - Google Patents

Method for controlling Iur interface forward cut-in channel flow based on predistributing policy Download PDF

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Publication number
CN1787453A
CN1787453A CN 200410098653 CN200410098653A CN1787453A CN 1787453 A CN1787453 A CN 1787453A CN 200410098653 CN200410098653 CN 200410098653 CN 200410098653 A CN200410098653 A CN 200410098653A CN 1787453 A CN1787453 A CN 1787453A
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credit
macd
macc
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available
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CN100411348C (en
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周胜
郑炜
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CNB2004100986534A priority Critical patent/CN100411348C/en
Priority to PCT/CN2005/002104 priority patent/WO2006060957A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation

Abstract

This invention relates to a method for controlling forward access channel flows of Iur interface, in which, before a media access special part (MACD) sends data to a control public part (MACC), it generates CREDIT and sets the ratio of the MACC buffer value and the MACD volume value the upper limit of the CREDIT assigned to each MACD, the CREDIT is generated every other period based on the generation rate of CREDIT, thus, the newly generated one is set to be CREDIT-NEW, the available one at the end of last period is CREDIT-OLD and the current available one is the sum of CREDIT-NEW and CREDIT-OLD to be judged if it reaches to the upper limit value, if so, the current available one is set to be the upper limit value.

Description

Iur interface forward access channel flow control methods based on the preassignment strategy
Technical field
The present invention relates to Wideband CDMA Technology, particularly a kind of flow control methods is a kind of Iur interface forward access channel flow control methods based on the preassignment strategy concretely.
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 (UMTS Terrestrial Radio Access Network, be called for short " UTRAN ") and subscriber equipment (User Equipment 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 (RadioNetwork 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 is as shown in Figure 1:
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 (Common Channel 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 AccessChannel, be called for short " FACH "), paging channel (Paging Channel, be called for short " PCH "), DSCH Downlink Shared Channel (Downlink Shared Channel, be called for short " DSCH ") and CPCH (Common PacketChannel is called for short " CPCH ").At third generation partner program (3rd Generation PartnershipProject, abbreviation " 3GPP ") described on the forward access channel in the agreement flow control should have been arranged, purpose is to control buffer memory between public part (MACC:Medium Access Control Common) in order to be used to be limited in media interviews control private part (MACD:Medium Access ControlDedicate) and media interviews, the signaling time-delay of limiting layer 2 and in forward access channel and minimizing abandons and retransmits when congested data.
The main body of finishing the forward access channel flow is MACC, and MACD will cooperate MACC to finish flow control process.Flow control process mainly is the flow control process between MACC and the MACD on the forward access channel.In actual applications, there is following problem in such scheme:
1, owing to MACD necessary first to file flow before MACC sends data, so data transmission delay is long.
2, such scheme can not adapt to well that common channel data transmission is of short duration, burst, multi-user's characteristics, the expensive time dispense flow rate of forward access channel and wait pending data to arrive, bandwidth availability ratio is low.
3, do not provide the concrete scheme of reasonable distribution flow in the 3GPP agreement, the unusual method of Iur interface forward access channel flow control is handled in the setting of data buffer zone size among the MACC.
Summary of the invention
A kind of Iur interface forward access channel flow control methods that provides based on the preassignment strategy is provided, reduce the time delay that data are transmitted by forward access channel by the Iur interface, improve forward access channel bandwidth usage efficient, and provide Iur interface forward access channel flow control control on Abnormal method.
For achieving the above object, technical scheme of the present invention is:
A kind of Iur interface forward access channel flow control methods is characterized in that, media interviews control private parts (MACD) generate CREDIT before public part (MACC) transmission data are controlled in media interviews:
The ratio of MACC cache size and MACD quantitative value is set at the CREDIT higher limit that each MACD is assigned with;
According to the generating rate of CREDIT, generate CREDIT every some cycles;
Here newly-generated CREDIT of the phase of establishing weekly is CREDIT_NEW, the last one-period available CREDIT_OLD when finishing, and then current available CREDIT of phase is CREDIT_NEW and available CREDIT_OLD sum weekly;
Judge whether CREDIT_NEW and CREDIT_OLD sum reach described CREDIT higher limit;
If then current available CREDIT is set to higher limit;
During the period 1, current available _ CREDIT of MACD is initial available CREDIT, and initial available CREDIT also is set to higher limit.
Described MACC cache size is determined by following steps: establishing the MACC cache size is C, and Iur interface peak transfer rate is V, and the CREDIT formation speed is P, and it is t that MACD sends duration with maximum rate, and the quantitative value of MACD is N; Then described MACC cache size C meets the following conditions:
C+P*t＝N*V*t
Thereby obtain MACC cache size C, the real cache size increases some surpluses according to traffic model on the basis of C.
In described MACD, generate described CREDIT; After described MACD sent data to described MACC, described MACD sent the data that are no more than current available CREDIT when each described end cycle;
After data sent, described MACD calculated available CREDIT_OLD, and establishing the available CREDIT that had used is CREDIT_USED, and then available CREDITO_LD=can use CREDIT-CREDIT_USED.
In described MACC, generate CREDIT; Phase is upgraded available CREDIT by described MACC to described MACD weekly; After phase MACD sent data weekly, described MACC calculated available CREDIT_OLD; The current available CREDIT-CREDIT_USD of available CREDIT_OLD=;
The available CREDIT that described MACD newly inserts MACD is set to the described upper limit.
For described MACC sets the buffer memory alert limit;
If the data volume of described MACC meets or exceeds alert limit, then MACC initiatively sets the available CREDIT of described MACD, will stop it and send data less than applying for that to MACC the available CREDIT of the MACD of flow is set at 0; According to the remaining MACC buffer memory available CREDIT that converts, mean allocation is given the MACD to MACC application flow:
Before the relieve congestion, the CREDIT assigning process of the MACD of MACC Event triggered application flow.
For described MACC sets the buffer memory lower warning limit;
If the data volume of MACC reaches or is lower than the buffer memory lower warning limit, described MACC relieve congestion, then MACC initiatively sets the available CREDIT of MACD, and the CREDIT of all MACD is set at 255.
When generating available CREDIT in described MACD, take place congestedly, described MACC stops described MACD and generates available CREDIT; Relieve congestion, described MACD sends request to described MACC, and described MACC notifies described MACD to recover available CREDIT and generates.
When generating available CREDIT in described MACC, during relieve congestion, described MACC generates CREDIT according to the cycle again; The available CREDIT of the described MACD of shape more.
If the CREDIT of MACC indication is not 0 or 255, then the available CREDIT of described MACD is set at the CREDIT value of message indication.
If MACD can't obtain CREDIT for a comparatively long period of time, MACD initiatively distributes CREDIT to the MACC request:
If MACD still can't obtain CREDIT for a comparatively long period of time, service wireless network controller migrates to floating radio network controller with this MACD.
To have distributed CREDIT be 0 also not to be 255 if MACC is MACD, do not receive the Frame that this MACD sends in after significant period of time, the CREDIT that the MACC cancellation has distributed, the CREDIT that distributes to this MACD is reduced a grade, notice MACD, continue to wait for that MACD sends Frame, be reduced to 0 until CREDIT, the data that stop this MACD send.
MACC cache size, buffer memory alert limit Th_high and buffer memory lower warning limit Th_low, CREDIT formation speed P and period T scheduling algorithm parameter are passed through O﹠amp; M is configured.
Beneficial effect of the present invention is, adopts the preassignment strategy, reduces data transmission delay.Utilize that common channel data transmission is of short duration, burst, multi-user's characteristics, improve forward access channel bandwidth usage efficient.Concrete effective I ur interface forward access channel flow control technique scheme is provided.
Description of drawings
Fig. 1 UTRAN structural representation;
Fig. 2 Iur interface forward access channel flow control schematic diagram.
Embodiment
By embodiment, describe implementation process of the present invention in detail.
The present invention comprises following steps:
The MACC buffer memory at first is set.If the MACC cache size is C.According to equation C+P*t=N*V*t, we can calculate MACC buffer memory C, and the real cache size of MACC can increase some surpluses according to traffic model on the basis of C.Wherein V is an Iur interface peak transfer rate, and P is the information header formation speed, and the number of users that N is, T are the user sends data with maximum rate duration.Each information header represents that MACD can send a protocol Data Unit (PDU:Protocol Data Unit) to MACC.For forward access channel, in case transport format combination set (TFCS:Transport Format Combination Set) determines that then P just can determine.According to certain traffic model, V is determined jointly by service rate, the Iur interface propagation delay time of common signal channel user applies; We can also determine that number of users N and user send the duration T of data with maximum rate by certain traffic model.
Be limited to C/N (N is the MACD number, and C is the MACC cache size) on the CREDIT that each user (hereinafter replacing with MACD) can distribute.The method that each user generates preallocated CREDIT has two kinds:
One, MACD generates automatically and sends the required CREDIT of data.The data that send in each cycle of MACD can not surpass the upper limit of assignable CREDIT.For example: (TTI:Transmission Timing Interval) is the cycle with forward direction access channel Transmission Time Interval; Every 10ms is one-period.In first period T, can send data immediately in order to make MACD.The initial available CREDIT of MACD is set at upper limit C/N.When period T finished, after data sent and finish, MACD calculated CREDIT_OLD; The initial available CREDIT-CREDIT_USED of available CREDIT_OLD=.Behind first end cycle, MACD is according to CREDIT formation speed P, newly-generated CREDIT_NEW of phase weekly, and calculate the current available CREDIT of MACD in the new cycle.Current available CREDIT=CREDIT_NEW+ can use CREDIT_OLD.After data sent and finished second round, the current available CREDIT-CREIT_USD of available CREDIT_OLD=.If the current available CREDIT among the new one-period T that MACD calculates has reached assignable CREDIT upper limit C/N, then MACD is set at the upper limit with current available CREDIT.Determining with the generating rate of CREDIT of the generation period T of CREDIT is closely related.For example, the TTI of FACH channel is 10ms, and the CREDIT generating rate of design is 1000/s, and then we can select every 10ms to generate 10 CREDIT (being that T is 10ms), also can select every 20ms to generate 20 CREDIT (being that T is 20ms).The generation period T of CREDIT determine to depend on concrete traffic model.Can adopt the generation period T of the TTI cycle of FACH channel as CREDIT.
The buffer memory C of MACC is set with alert limit (Th_high) and buffer memory lower warning limit (Th_low).If it is congested that MACC data in buffer amount is called MACC when meeting or exceeding alert limit (Th_high).
MACC takes place when congested, and MACD generates available CREDIT no longer automatically, is initiatively set user's current available CREDIT by flow control (FLOW CONTROL) message by MACC.Will be less than applying for that to MACC the CREDIT of the MACD of flow is set at 0.(stipulate that in the 3GPP agreement 0 expression DRNC takes place congested, SRNC stops MACC service info element (SDU:Service Data Unit) immediately and sends.) order these users to stop to send data and stopping the process that MACD generates CREDIT automatically.
Before the MACC relieve congestion, MACC Event triggered CREDIT assigning process, after if MACC receives MACD transmitted traffic request message (CAPACITY REQUEST) or Frame (DATA FRAME) message application flow, MACC is scaled available CREDIT mean allocation with the remaining cache of buffer memory C and applies for the MACD of flow for the oriented MACC of institute.The flow control messages indication CREDIT that MACC sends, the available CREDIT of MACD is set to the CREDIT (being not equal to 0 or 255) of flow control messages indication, and MACD stops the automatic generative process of CREDIT simultaneously.
Being called MACC when MACC data in buffer amount reaches or be lower than lower warning limit (Th_low) removes congested.Behind the relieve congestion, MACC initiatively sets user's available CREDIT once more by flow control messages, and all users' CREDIT is set at 255, (in the 3GPP agreement regulation 255 expressions unrestricted-unlimited, SRNC can unrestricted transmission SDU).Order MACD restarts to generate automatically the process of CREDIT.It is 255 that MACD receives flow control messages indication CREDIT, and then the MACD restore data sends and the CREDIT generative process.
In data transfer procedure,, cause deadlock easily in case unknown causes such as flow control messages or Frame information drop-out take place.For avoiding taking place above-mentioned situation.If MACD can't obtain the CREDIT that MACC distributes for a comparatively long period of time, MACD initiatively distributes CREDIT to MACC transmitted traffic request message requests.
1) deadlock situation occurs in when congested normal condition does not take place.Because CREDIT was generated by the MACD cycle.When MACC receives the flow request of MACD transmission, start the CREDIT generative process by flow control messages notice MACD and just can deal with problems.
2) deadlock situation is freeed when generation MACC is congested; MACD does not obtain the available CREDIT that distributes.MACD waits for through significant period of time behind MACC transmitted traffic request message, if the CREDIT that MACD still can't obtain distributing, for fear of the MACD call drop, also in order to alleviate the congested of Iur interface forward access channel, service wireless network controller can migrate to floating radio network controller with this MACD simultaneously.Stand-by period is herein passed through O﹠amp when actual networking; One of algorithm parameter of M configuration is determined according to the propagation delay time of real network.
3) deadlock situation occurs in MACC and takes place when congested, and MACC distributes to MACD and distributed available CREDIT; Do not receive the Frame of MACD again in long duration.And MACC has distributed CREDIT when (being not equal to 0 or 255) for the MACD of application flow before releasing is congested.MACC can distribute to the CREDIT of this MACD by the flow control messages cancellation, after this CREDIT that is assigned to D reduced a grade, remaining CREDIT is distributed to the MACD of other application flow, again again by the new CREDIT of distribution of flow control messages notice MACD, continue to wait for that MACD sends DATA FRAME, be reduced to 0 until CREDIT, stop this user's data and send and the CREDIT generative process.
Two, after MACC generates the available CREDIT of MACD, upgrade the available CREDIT of MACD to MACD by MACC transmitted traffic control messages.Period 1, the initial available CREDIT of MACC MACD is set to higher limit C/N, makes MACD send data immediately.MACD sent data and finished when finishing period 1, and the data volume of being sent out is no more than initial available CREDIT; MACC calculates available CREDIT_OLD.Available CREDIT_OLD=is initially available _ CREDIT-CREDIT_USED.Second round, MACC upgrades current available CREDIT by flow control messages to MACD with according to CREDIT formation speed P.The new user who inserts is set at restriction with its initial available CREDIT.
If it is congested that MACC takes place, then MACC will be less than applying for that to MACC the user's of flow CREDIT is set at 0, and the transmitted traffic control messages orders these users to stop to send data.According to the remaining MACC buffer memory available CREDIT that converts, mean allocation is given the MACD to MACC application flow.Before the MACC relieve congestion, after MACC receives the flow request or Frame message that MACD sends, the assigning process of Event triggered CREDIT.If it is congested that MACC removes, then MACC upgrades available CREDIT by flow control messages to MACD again, record CREDIT_OLD.
Because MACD does not initiatively give birth to available CREDIT, but by upgrading by MACC transmitted traffic control messages.Therefore MACD sends data according to the available CREDIT of flow control messages indication fully, no longer implements to stop the action of CREDIT generative process.
MACC cache size C and buffer memory alert limit Th_high and buffer memory lower warning limit Th_low, CREDIT formation speed P and period T scheduling algorithm parameter can be by operation and maintenance (O﹠M:Operating﹠amp; Maintenance) be configured, to adapt to Iur interface time delay, channel configuration and the traffic model under the different application scene.Above embodiment only is used to implementation process of the present invention is described, is not to be used to limit scope of the present invention.
Beneficial effect of the present invention is, adopts the predistribution strategy, reduces data transmission delay. Utilize public Channel data transmission is of short duration, burst, multi-user's characteristics, improves forward access channel bandwidth usage efficient. Provide concrete effectively Iur interface forward to insert channel flow control technology scheme.

Claims (13)

1. an Iur interface forward access channel flow control methods is characterized in that, media interviews control private parts (MACD) generate CREDIT before public part (MACC) transmission data are controlled in media interviews:
The ratio of MACC cache size and MACD quantitative value is set at the CREDIT higher limit that each MACD is assigned with;
According to the generating rate of CREDIT, generate CREDIT every some cycles;
Here newly-generated CREDIT of the phase of establishing weekly is CREDIT_NEW, the last one-period available CREDIT_OLD when finishing; Then current available CREDIT of phase is CREDIT_NEW and available CREDIT_OLD sum weekly;
Judge whether CREDIT_NEW and CREDIT_OLD sum reach described CREDIT higher limit;
If then current available CREDIT is set to higher limit.
2. method according to claim 1 is characterized in that, during the period 1, current available _ CREDIT of MACD is initial available CREDIT, and initial available CREDIT also is set to higher limit.
3. method according to claim 1 is characterized in that, described MACC cache size is determined by following steps: establishing the MACC cache size is C, Iur interface peak transfer rate is V, the CREDIT formation speed is P, and it is t that MACD sends duration with maximum rate, and the quantitative value of MACD is N; Then described MACC cache size C meets the following conditions:
C+P*t＝N*V*t
Thereby obtain MACC cache size C, the real cache size increases some surpluses according to traffic model on the basis of C.
4. method according to claim 1 is characterized in that, generates described CREDIT in described MACD;
After described MACD sent data to described MACC, described MACD sent the data that are no more than current available CREDIT when each described end cycle;
After data sent, described MACD calculated available CREDIT_OLD, and establishing the available CREDIT that had used is CREDIT_USED, the current available CREDIT-CREDIT_USED of then available CREDIT_OLD=.
5. method according to claim 1 is characterized in that, generates CREDIT in described MACC;
Phase is upgraded current available CREDIT by described MACC to described MACD weekly; After phase MACD sent data weekly, described MACC calculated available CREDIT_OLD; The current available CREDIT-CREDIT_USD of available CREDIT_OLD=;
The available CREDIT that described MACD newly inserts MACD is set to the described upper limit.
6. method according to claim 1 is characterized in that may further comprise the steps:
For described MACC sets the buffer memory alert limit;
If the data volume of described MACC meets or exceeds alert limit, then MACC initiatively sets the available CREDIT of described MACD, will stop it and send data less than applying for that to MACC the available CREDIT of the MACD of flow is set at 0; According to the remaining MACC buffer memory available CREDIT that converts, mean allocation is given the MACD to MACC application flow;
Before the relieve congestion, the CREDIT assigning process of the MACD of MACC Event triggered application flow.
7. method according to claim 1 is characterized in that may further comprise the steps:
For described MACC sets the buffer memory lower warning limit;
If the data volume of MACC reaches or is lower than the buffer memory lower warning limit, described MACC relieve congestion, then MACC initiatively sets the available CREDIT of MACD, and the CREDIT of all MACD is set at 255.
8. according to claim 6 or 7 described methods, it is characterized in that if the CREDIT of MACC indication is not 0 or 255, then the available CREDIT of described MACD is set at the CREDIT value of message indication.
9. according to claim 4 or 6 or 7 described methods, it is characterized in that take place congestedly, described MACC stops described MACD and generates available CREDIT; Relieve congestion, described MACD sends request to described MACC, and described MACC notifies described MACD to recover available CREDIT and generates.
10. according to claim 5 or 7 described methods, it is characterized in that during relieve congestion, described MACC generates CREDIT according to the cycle again; The available CREDIT of the described MACD of shape more.
11. method according to claim 6 is characterized in that may further comprise the steps:
If MACD can't obtain CREDIT for a comparatively long period of time, MACD initiatively distributes to the MACC request
If MACD still can't obtain CREDIT for a comparatively long period of time, service wireless network controller migrates to floating radio network controller with this MACD.
12. method according to claim 8, it is characterized in that, to have distributed CREDIT be 0 also not to be 255 if MACC is MACD, do not receive the Frame that this MACD sends in after significant period of time, the CREDIT that the MACC cancellation has distributed reduces a grade with the CREDIT that distributes to this MACD, notice MACD, continue to wait for that MACD sends Frame, be reduced to 0 until CREDIT, the data that stop this MACD send.
13., it is characterized in that MACC cache size, buffer memory alert limit and buffer memory lower warning limit, CREDIT formation speed P and period T scheduling algorithm parameter are passed through O﹠amp according to claim 3 or 6 or 7 described methods; M is configured.
CNB2004100986534A 2004-12-10 2004-12-10 Method for controlling Iur interface forward cut-in channel flow based on predistributing policy Expired - Fee Related CN100411348C (en)

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PCT/CN2005/002104 WO2006060957A1 (en) 2004-12-10 2005-12-07 A FLOW CONTROL METHOD IN THE FORWARD ACCESS CHANNEL VIA Iur INTERFACE

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101184022B (en) * 2006-11-13 2011-10-05 中芯国际集成电路制造(上海)有限公司 Credit processing equipment and flow control transmission apparatus and method thereof
CN102333374A (en) * 2010-07-13 2012-01-25 大唐移动通信设备有限公司 Enhanced CELL_FACH state data issue method and system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1312885C (en) * 2000-02-25 2007-04-25 艾利森电话股份有限公司 Flow control between transmitter and receiver entities in communications system
US7706405B2 (en) * 2002-09-12 2010-04-27 Interdigital Technology Corporation System for efficient recovery of Node-B buffered data following MAC layer reset
CN1263241C (en) * 2003-04-11 2006-07-05 中兴通讯股份有限公司 Adaptive flow rate control method of forward access transmission channel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101184022B (en) * 2006-11-13 2011-10-05 中芯国际集成电路制造(上海)有限公司 Credit processing equipment and flow control transmission apparatus and method thereof
CN102333374A (en) * 2010-07-13 2012-01-25 大唐移动通信设备有限公司 Enhanced CELL_FACH state data issue method and system
CN102333374B (en) * 2010-07-13 2015-07-08 大唐移动通信设备有限公司 Enhanced CELL_FACH state data issue method and system

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