CN100411348C - 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 PDFInfo
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- CN100411348C CN100411348C CNB2004100986534A CN200410098653A CN100411348C CN 100411348 C CN100411348 C CN 100411348C CN B2004100986534 A CNB2004100986534 A CN B2004100986534A CN 200410098653 A CN200410098653 A CN 200410098653A CN 100411348 C CN100411348 C CN 100411348C
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- 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
The present invention relates to a method for controlling the flow of an Iur interface forward access channel. A media access controlling dedicated part (MACD) generates CREDIT before transmitting data to a media access controlling common part (MACC). The present invention comprises the following steps: setting the ratio of an MACC buffer value to an MACD quantitative value as an upper limit value for each CREDIT distributed by the MACD; generating the CREDIT every other cycles according to the generating speed rate of the CREDIT; setting the CREDIT newly generated in each cycle as CREDIT_NEW, using CREDIT_OLD to represent the CREDIT when a previous cycle is ended, and using the sum of the CREDIT_NEW and the CREDIT_OLD to represent current CREDIT in each cycle; judging whether the sum of the CREDIT_NEW and the CREDIT_OLD reaches the upper limit value of the CREDIT, if true, then the current usable CREDIT is set as the upper limit value. The present invention has the advantages of reducing the time delay of data transmission and improving the bandwidth utilization efficiency of a forward access channel by adopting a pre-distribution strategy.
Description
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), the signaling time-delay of limiting layer 2 and the data that minimizing abandons and retransmits when forward access channel is congested in order to be used to be limited in media interviews control private part (MACD:Medium Access ControlDedicate) and media interviews.
The main body of finishing the forward access channel flow control 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:
Media interviews control private part MACD is before public part MACC transmission data are controlled in media interviews, and MACD is set at the MACC cache size and the ratio of MACD quantitative value the initial value of the current available CREDIT of oneself; Generate CREDIT according to default formation speed and preset period T, the newly-generated CREDIT of phase T is CREDIT_NEW weekly, available CREDIT when last one-period finishes is CREDIT_OLD, and current available CREDIT value is CREDIT NEW and CREDIT_OLD sum the phase weekly; If current available CREDIT value is more than or equal to initial value, then with initial value as current available CREDIT; In each cycle, send the data that are no more than current available CREDIT.
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, i.e. CREDIT formation speed, and N is a number of users, t is the user sends data with maximum rate a 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.
Secondly, the user generates preallocated CREDIT.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 (being the initial value of current 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 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.Available CREDIT=CREDIT_NEW+CREDIT_OLD.After data sent and finished second round, the current available CREDIT-CREIT_USED of CREDIT_OLD=.If the 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 available CREDIT.Determining with the CREDIT formation speed 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.Being called MACC when MACC data in buffer amount reaches or is lower than lower warning limit Th_low removes congested.
MACC takes place when congested, and MACD generates available CREDIT no longer automatically, is initiatively set user's 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 it is congested that O represents that DRNC takes place, 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 are set to the CREDIT (be not equal to 0 or be not equal to 255) of flow control messages indication, and MACD stops the automatic generative process of CREDIT simultaneously.
When MACC data in buffer amount reached or is lower than lower warning limit Th_low, MACC removed 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 occurs in and MACC takes place when 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; In the long duration, do not receive the Frame of MACD.And MACC is removing when having distributed CREDIT (be not equal to 0 or be not equal to 255) for the MACD of application flow before congested, MACC can distribute to the CREDIT of this MACD by the flow control messages cancellation, after being assigned to grade of CREDIT reduction of this MACD, remaining CREDIT is distributed to the MACD of other application flow, again notify this MACD the new CREDIT of distribution by flow control messages again, continue to wait for that this 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 CREDIT_OLD.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 generate available CREDIT, but is upgraded by MACC transmitted traffic control messages, so MACD no longer implements to stop the action of CREDIT generative process fully according to the available CREDIT transmission data of flow control messages indication.
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﹠amp; 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 (11)
1. Iur interface forward access channel flow control methods, it is characterized in that, media interviews control private part MACD is before public part MACC transmission data are controlled in media interviews, and MACD is set at the MACC cache size and the ratio of MACD quantitative value the initial value of the current available credit volume CREDIT of oneself;
Generate CREDIT according to default formation speed and preset period T, the newly-generated CREDIT of phase T is CREDIT_NEW weekly, available CREDIT when last one-period finishes is CREDIT_OLD, and current available CREDIT of phase is CREDIT_NEW and CREDIT_OLD sum weekly;
If current available CREDIT is more than or equal to initial value, then with initial value as current available CREDIT;
In each cycle, send the data that are no more than current available CREDIT.
2. 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 formation speed of CREDIT is P, and MACD is t with the duration that maximum rate sends data, 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.
3. method according to claim 1 is characterized in that further comprising the steps of:
For described MACC sets buffer memory alert limit and buffer memory lower warning 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 data volume of described MACC reaches or is lower than lower warning limit, the CREDIT assigning process of the MACD of MACC Event triggered application flow.
4. 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, then MACC initiatively sets the available CREDIT of MACD, and the CREDIT of all MACD is set at 255.
5. according to claim 3 or 4 described methods, it is characterized in that the available CREDIT that described MACC initiatively sets MACD is:
Described MACC is by the available CREDIT of flow control messages indication MACD;
If the available CREDIT of MACC indication is not 0 or is not 255 that then the available CREDIT of described MACD is set at the CREDIT value of described flow control messages indication.
6. method according to claim 5 is characterized in that,
If the available CREDIT of MACC indication is 0, then described MACD stops to generate CREDIT;
If the available CREDIT of MACC indication is 255, then the MACD restore data sends and the CREDIT generative process.
7. method according to claim 1 is characterized in that further comprising the steps of:
For described MACC sets the buffer memory alert limit;
If the data volume of described MACC meets or exceeds alert limit, and described MACD can't obtain CREDIT in Preset Time, and then service wireless network controller migrates to floating radio network controller with this MACD.
8. method according to claim 1 is characterized in that,
For described MACC sets the buffer memory lower warning limit;
If before the data volume of described MACC reaches or is lower than lower warning limit, MACC is that MACD has distributed CREDIT and is not 0 also not to be 255, and, do not receive the Frame that this MACD sends in the Preset Time after the data volume of described MACC meets or exceeds alert limit, then the CREDIT of this MACD has been distributed in the MACC cancellation, the CREDIT that distributes to this MACD is reduced a grade, notify this MACD, continue to wait for that this MACD sends Frame, be reduced to 0 until CREDIT, the data that stop this MACD send.
9. method according to claim 2 is characterized in that, the formation speed P of MACC cache size, CREDIT and period T are by operation and maintenance O﹠amp; M is configured.
10. method according to claim 3 is characterized in that, described buffer memory alert limit is by operation and maintenance O﹠amp; M is configured.
11. method according to claim 4 is characterized in that, described buffer memory lower warning limit is by operation and maintenance O﹠amp; M is configured.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100986534A CN100411348C (en) | 2004-12-10 | 2004-12-10 | Method for controlling Iur interface forward cut-in channel flow based on predistributing policy |
| PCT/CN2005/002104 WO2006060957A1 (en) | 2004-12-10 | 2005-12-07 | A FLOW CONTROL METHOD IN THE FORWARD ACCESS CHANNEL VIA Iur INTERFACE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100986534A CN100411348C (en) | 2004-12-10 | 2004-12-10 | Method for controlling Iur interface forward cut-in channel flow based on predistributing policy |
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| Publication Number | Publication Date |
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| CN1787453A CN1787453A (en) | 2006-06-14 |
| CN100411348C true CN100411348C (en) | 2008-08-13 |
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| CNB2004100986534A Expired - Fee Related CN100411348C (en) | 2004-12-10 | 2004-12-10 | Method for controlling Iur interface forward cut-in channel flow based on predistributing policy |
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| WO (1) | WO2006060957A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426651A (en) * | 2000-02-25 | 2003-06-25 | 艾利森电话股份有限公司 | Flow control between transmitter and receiver entities in communications system |
| US20040052229A1 (en) * | 2002-09-12 | 2004-03-18 | Interdigital Technology Corporation | System for efficient recovery of Node-B buffered data following MAC layer reset |
| CN1536798A (en) * | 2003-04-11 | 2004-10-13 | 深圳市中兴通讯有限公司南京分公司 | Adaptive flow rate control method of forward access transmission channel |
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- 2004-12-10 CN CNB2004100986534A patent/CN100411348C/en not_active Expired - Fee Related
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- 2005-12-07 WO PCT/CN2005/002104 patent/WO2006060957A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426651A (en) * | 2000-02-25 | 2003-06-25 | 艾利森电话股份有限公司 | Flow control between transmitter and receiver entities in communications system |
| US20040052229A1 (en) * | 2002-09-12 | 2004-03-18 | Interdigital Technology Corporation | System for efficient recovery of Node-B buffered data following MAC layer reset |
| CN1536798A (en) * | 2003-04-11 | 2004-10-13 | 深圳市中兴通讯有限公司南京分公司 | Adaptive flow rate control method of forward access transmission channel |
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| CN1787453A (en) | 2006-06-14 |
| WO2006060957A1 (en) | 2006-06-15 |
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