CN101123479B - A minimal frequency spreading factor reconfiguration method for special uplink channel - Google Patents

Abstract

The present invention relates to a reconfiguration method of the smallest spread frequency factor of a dedicated uplink channel. The present invention includes two steps. Firstly, the smallest spread frequency factor is initially configured, and when the transmission format set is changed, the smallest spread frequency factor is recalculated in order to provide a basis for the resource reservation of NodeB; secondly, the smallest spread frequency factor is dynamically regulated, and according to the transmission format subset, the present smallest spread frequency factor is regulated in orderto regulate the actual traffic transmission ability. Since the smallest spread frequency factor of the dedicated uplink channel is dynamically regulated according to the actual traffic, the resource utilization ratio and performance of a system is increased.

Description

A kind of minimal frequency spreading factor reconfiguration method for special uplink channel

Technical field

The present invention relates to a kind of special uplink channel (DCH) channel minimal frequency spreading factor (MinSF) reallocating method of Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access) system (hereinafter to be referred as WCDMA), to improve resource utilization ratio and systematic function.

Background technology

[buffer memory occupies (Buffer Occupy in the speed adjustment of up DCH channel, BO) trigger or subscriber equipment (UE) internal measurement triggers] can control (TFC Control) flow process by transmission format set or radio bearer (RB) reprovision flow process is carried out, the interval of adjustment is MinSF～256.In 25.331 agreements, Frequency Division Duplexing (FDD) minimal frequency spreading factor ability for up does not define, but in the 10.3.6.88 of agreement Uplink DPCH info, the minimal frequency spreading factor that includes up permission, integer (4,8,16,32,64,128,256) (Minimum allowed SF of the channelisation code fordata part).In fact this is exactly the data bandwidth that has defined the maximum that up DCH channel can carry.

For NodeB, need carry out resource reservation according to the up minimal frequency spreading factor of UE, and up service rate is in fluctuation status constantly, if minimal frequency spreading factor is a fixing value, be in a fluctuation status at service rate much smaller than speed or the speed that MinSF supports so, for NodeB, can cause the waste of resource.

Therefore, be necessary, the minimal frequency spreading factor of up DCH channel is adjusted, to save the resource of NodeB according to actual conditions.

UE is according to the TFCs of up DCH, and choose spreading factor (SF) with maximum transmitting capacity principle and carry out data and send, SF＞=MinSF wherein, TFCs (Transport Format Combinationsubset) is the subclass of transmission format set (TFCS).

Up link (UL) MinSF initial setting up is provided with according to TFCS, and establishing its corresponding maximum bit rate is UlMaxbitRate.The incident that can trigger initial setting up has:

1) RB reprovision;

2) transmission channel reprovision;

3) cell update;

4) switch;

5) RB sets up;

6) Radio Resource control is set up;

7) RB discharges.

The initial configuration of UL MinSF calculates corresponding SF according to that TFC index (Index) of corresponding maximum rate among the TFCS, in uplink dedicated physical channels information (Uplink DPCHInfo), send to UE (issuing) by above-mentioned flow process, under default situations, TFCs is TFCS in above-mentioned signaling.

Carry out in the process in business, radio network controller need carry out the speed adjustment to up DCH according to BO incident or through-put power (TxP) incident, RNC sends TFC Control and (refers in particular to TFCs reprovision flow process here, do not comprise the TFCS reprovision, if trigger the TFCS reprovision, it is classified as MinSF initial setting up flow process), reprovision ULTFCs.Wherein pairing maximum transmitting capacity is up maximum bit rate among the TFCs.

If UL SF does not adjust according to the actual transmitting capacity of business, so, concerning Radio Resource, can cause waste.Therefore, when triggering speed adjustment (only refer to TFCs here and adjust flow process,, trigger MinSF initial configuration flow process), trigger MinSF and dynamically adjust flow process if TFCS adjusts.

Desirable SF adjustment process as shown in Figure 1, the corresponding minimum SF of maximum rate wherein.Among the figure 3 pairs of curves deserved be the value of initial MinSF, curve 2 is a UE UL bit rate, curve 1 is desirable MinSF change curve.

The precondition of MinSF reprovision flow process is that up TFCS is constant, when TFCS changes, triggers MinSF initial configuration flow process.

Summary of the invention

The method and system that the purpose of this invention is to provide the up DCH channel of reprovision minimal frequency spreading factor in a kind of WCDMA system to improve the resource utilization of system, improve power system capacity.

The invention provides a kind of minimal frequency spreading factor reconfiguration method for special uplink channel, comprise the steps:

Step 1, minimal frequency spreading factor initial configuration recomputate described minimal frequency spreading factor when transmission format set changes, be used to the resource reservation of NodeB that foundation is provided;

Step 2, described minimal frequency spreading factor are dynamically adjusted, and adjust current minimal frequency spreading factor according to transmission format subset, are used for the actual transmitting capacity of business is adjusted.

Above-mentioned steps 2 comprises following concrete steps:

Step 31, triggering special uplink channel speed are adjusted;

Step 32, recomputate described minimal frequency spreading factor;

Step 33, the result of calculation of described step 32 and current minimal frequency spreading factor are compared, if change, execution in step 34, otherwise execution in step 35;

Step 34, replace current minimal frequency spreading factor, utilize the RB reconfiguration message that new described minimal frequency spreading factor and transmission format subset information are issued subscriber equipment with the result of calculation of described step 32;

Step 35, transmission format set control special uplink channel speed.

Preferably, described step 1 comprises following concrete steps:

Step 21, triggering radio bearer reprovision flow process;

Whether step 22, the described transmission format set of inspection change; Execution in step 23 if change, otherwise finish;

Step 23, recomputate described minimal frequency spreading factor;

Step 24, described minimal frequency spreading factor is issued subscriber equipment by the radio bearer reprovision.

In the described step 32, according to the new described minimal frequency spreading factor of transmission format set calculating of corresponding maximum upstream rate in the adjusted transmission format subset.

The calculation procedure that also comprises described minimal frequency spreading factor before the described step 1 is used for calculating described minimal frequency spreading factor according to current transmission format set or transmission format subset, for the NodeB resource reservation provides foundation, comprises following concrete steps:

Total number of bits Ni of step 51, every transmission channel of calculating;

Step 52, parameter N UE, S set et0 and set PSet are set, and get among the described Set0 peaked sequence number L less than NUE;

Step 53, calculating are used for productive set Set1 or S set et2 parameters needed Njudge;

Step 54, the described minimal frequency spreading factor SF of calculating.

Adopt method of the present invention, can carry out that up DCH minimal frequency spreading factor is dynamic to be adjusted and initial configuration,, improved the resource utilization and the systematic function of system for the resource reservation of NodeB provides foundation according to the activity situation of actual volume and DCH.

Description of drawings

Fig. 1 is desirable MinSF change curve;

Fig. 2 is the MinSF algorithm flow chart;

Fig. 3 is a MinSF initial configuration algorithm flow chart;

Fig. 4 is that MinSF dynamically adjusts flow chart.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail.

MinSF reprovision flow process as shown in Figure 2.If trigger RB reprovision flow process 201, at first check TFCS202, if TFCS changes, then recomputate up MinSF 203, trigger MinSF initial configuration flow process 204, if TFCS does not change, flow process finishes.If trigger TFC Control 205, then upgrade up MinSF 203, compare 206 according to MinSF that calculates and current MinSF, if MinSF changes, then start MinSF and dynamically adjust flow process 207, otherwise process ends.

The MinSF reprovision comprises three flow processs:

1) MinSF calculates;

2) MinSF initial configuration;

3) MinSF dynamically adjusts.

The basic principle that MinSF dynamically adjusts is:

1) milder rising converges on professional actual needed MinSF;

2) in time satisfy the two-forty demand.

Input parameter:

1) TrCH Num: among the up CCTrCH, the number of DCH channel;

2) TFCS: uplink form set;

3) TTI: Transmission Time Interval;

4) RM: all DCH channel speed match parameter;

5) PL: the up punching limit;

6) CodeType:DCH chnnel coding type.

Below above-mentioned 3 flow processs are described respectively.

1) minimal frequency spreading factor calculation process

As shown in Figure 2, algorithm at first calculates minimal frequency spreading factor according to current TFCS or TFCs, and flow process is as follows:

A gets the maximum transport format n among the TFCS of TrCH _i* TBSize _i, wherein i represents i bar transmission channel, and the maximum of i is got the number of transmission channel, and TBSize is a transport block size;

N _i＝n _i×(TBSize _i+CRCSize _i)

b

N wherein _i

Be worth relevant with transformat, such as 384k speed, n _iBe exactly 12; The meaning of function C eil () is for rounding; TtiNum is the number of TTI;

c $\mathrm{NTfc}=\underset{i}{\mathrm{\Σ}}{\mathrm{NTfc}}_i,$ Wherein i gets the number of transmission channel;

D gets the MinRM=min (RM of all TrCH _i);

E calculates $\mathrm{NRm}=\underset{i}{\mathrm{\Σ}}{\mathrm{NTfc}}_i\×{\mathrm{RM}}_i;$

F is provided with N _UE=2400;

g Set ₀＝[150?300?600?1200?2400?4800?9600?19200?28800?38400?48000?57600]；

H gets Set ₀In less than N _UEPeaked sequence number L;

N _judge＝MinRM×Set ₀(j)-NRm，j＝1，2，...，L

PSet＝[1?1?1?1?1?1?1?2?3 4?5?6]

i k＝1；

$\left.\begin{array}{c}{\mathrm{Set}}_1\left(k\right)={\mathrm{Set}}_o\left(j\right),k=k+1\\ \mathrm{RecNo}\left(k\right)=j\end{array}\right\},$ if?N _judge≥0&&PSet(j)≤1

If j is Set ₁Be nonempty set, getting Index so is Set ₁The sequence number of that minimum element;

K then solves $\begin{array}{c}\mathrm{SF}=\mathrm{SfSet}\left(\mathrm{RecNo}\left(\mathrm{index}\right)\right)\\ \mathrm{SfSet}=\left[\begin{array}{cccccccccccc}256& 128& 64& 32& 16& 8& 4& 4& 4& 4& 4& 4\end{array}\right]\end{array};$

If l is Set ₁Be sky

N _judge＝MinRM×Set ₀(j)-NRm×PL，j＝1，2，...，L

PSet＝[1?1?1?1?1?1?1?2?3?4?5?6]

m k＝1

$\left.\begin{array}{c}{\mathrm{Set}}_2\left(k\right)={\mathrm{Set}}_o\left(j\right),k=k+1\\ \mathrm{RecNo}\left(k\right)=j\end{array}\right\},$ if?N _judge≥0；

If n is Set ₂Be nonempty set, getting Index1 so is Set ₂The sequence number of that minimum element, getting Index2 is Set ₂The sequence number of that maximum element;

If o is Index1＜Index2, and, PSet (RecNo (Index2))==PSet (RecNo (Index1)), Index=Index1+1, otherwise, Index=Index1;

P solves $\begin{array}{c}\mathrm{SF}=\mathrm{SfSet}\left(\mathrm{RecNo}\left(\mathrm{index}\right)\right)\\ \mathrm{SfSet}=\left[\begin{array}{cccccccccccc}256& 128& 64& 32& 16& 8& 4& 4& 4& 4& 4& 4\end{array}\right]\end{array}.$

2) minimal frequency spreading factor initial configuration flow process

When the following three class trigger conditions described in satisfying system schema, trigger MinSF initial configuration flow process:

A) uplink service initially is based upon the DCH channel;

B) uplink service that is based upon the DCH channel discharges;

C) up DCH channel migration comprises: FACH-〉DCH, PCH-〉DCH, IDLE-〉DCH.

Above-mentioned three class trigger conditions need to trigger RB reprovision flow process, therefore, calculate new MinSF according to new TFCS, are handed down to UE among the Phy Info in RB Reconfig Info.Therefore, the initial configuration flow process of MinSF is triggered by the RB reprovision.At this moment, TFCs is default conditions, is consistent with TFCS.

Algorithm flow chart as shown in Figure 3.Whether the minimal frequency spreading factor reconfiguration flow process triggers 301 by the RB reprovision, field UlTfcsSttate record TFCS can be set change.When up TFCS recomputates, UlTfcsState=1 is set.When triggering MinSF initial configuration flow process, at first check UlTfcsState state variable 302, if be 1, recomputate up MinSF 303, issue UE 304 by RB Reconfig, and the UlTfcsState field is resetted.If be 0, flow process finishes.

MinSF initial configuration algorithm flow acquiescence MinSF=4.

3) minimal frequency spreading factor reconfiguration flow process

Algorithm flow as shown in Figure 4.When triggering up DCH speed and adjusting, trigger TFC Control, trigger more new technological process of MinSF, according to new TFCs MinSF is carried out going up dynamically and be in harmonious proportion downward modulation and handle, new MinSF is issued by RB reprovision flow process.When the speed downward modulation that is in harmonious proportion on the DCH speed all can trigger TFC Control flow process, the SF and the current minimal frequency spreading factor (PreMinSF) that calculate maximum rate correspondence among the adjusted TFCs according to the minimal frequency spreading factor flow process compare, and adjust MinSF by following principle:

A is when carrying out up DCH speed (removing because the additions and deletions of channel or the RB reprovision that migration causes) 401 when adjusting;

B is according to adjusted TFCs, and the TFCI that gets corresponding maximum upstream rate calculates input 402 as new MinSF;

C utilizes the TFC of new TFCI correspondence to calculate new SF 403;

If d SF and current MinSF relatively change 404, carry out 406, otherwise carry out 405;

E replaces current MinSF with new SF, utilizes RB Reconfig Info that new MinSF and TFCs information are issued UE 406, and flow process finishes;

F otherwise carry out TFC Control and control up DCH speed flow process 405.

The TFCs of up DCH adjusts, and is relevant with the speed adjustment, and according to dynamic radio carrying control (DRBC) algorithm, up DCH speed is adjusted, mainly based on TxP (speed downward modulation), BO 4A (speed rise) and BO 4B (speed downward modulation).These speed adjustment algorithm are taken the factor of rate oscillation into account.Therefore, when speed is adjusted, should make a response to MinSF at once, to adapt to the variation of data volume.

In sum, this method is by carrying out initial configuration to the minimum SF of up DCH and dynamically adjust, and the effective resource in the WCDMA system has improved the capacity of system.

Those skilled in the art can also carry out various modifications to above content under the condition that does not break away from the definite the spirit and scope of the present invention of claims.Therefore scope of the present invention is not limited in above explanation, but determine by the scope of claims.

Claims (3)

1. a minimal frequency spreading factor reconfiguration method for special uplink channel is characterized in that, comprises the steps:

Step 1, minimal frequency spreading factor initial configuration recomputate described minimal frequency spreading factor when transmission format set changes, be used to the resource reservation of NodeB that foundation is provided;

Step 2, described minimal frequency spreading factor are dynamically adjusted, and adjust current minimal frequency spreading factor according to transmission format subset, are used for the actual transmitting capacity of business is adjusted;

Described step 2 specifically comprises:

Step 31, triggering special uplink channel speed are adjusted;

Step 32, recomputate described minimal frequency spreading factor;

Step 33, the result of calculation of described step 32 and current minimal frequency spreading factor are compared, if change, execution in step 34, otherwise execution in step 35;

Step 34, replace current minimal frequency spreading factor, utilize the RB reconfiguration message that new described minimal frequency spreading factor and transmission format subset information are issued subscriber equipment with the result of calculation of described step 32;

Step 35, transmission format set control special uplink channel speed.

2. minimal frequency spreading factor reconfiguration method as claimed in claim 1 is characterized in that, described step 1 comprises following concrete steps:

Step 21, triggering radio bearer reprovision flow process;

Whether step 22, the described transmission format set of inspection change; Execution in step 23 if change, otherwise finish;

Step 23, recomputate described minimal frequency spreading factor;

Step 24, described minimal frequency spreading factor is issued subscriber equipment by the radio bearer reprovision.

3. minimal frequency spreading factor reconfiguration method as claimed in claim 1 is characterized in that, in the described step 32, according to the new described minimal frequency spreading factor of transmission format set calculating of corresponding maximum upstream rate in the adjusted transmission format subset.

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