CN1667988B - A method of parsing from the transmission format combination calculation value to the transmission format indication - Google Patents

Abstract

The present invention analyzes the transmission format combination calculation value CTFC to the transmission format indicator TFI of each transmission channel, and obtains the TFI of each transmission channel by performing recursive modulo and integer division operations on CTFC and the transmission format number L of each transmission channel. It includes the following steps: the receiver obtains the parameter CTFC, the number of transmission channels I, and the number of transmission formats L ₁ , L ₂ , ..., L _I of each transmission channel through the physical layer signaling of TFCI; sets the intermediate variable T_CTFC and the loop variable i The initial values are CTFC and 1 respectively; execute the loop operation TFI _i ＝T_CTFC MOD L _i , T_CTFC＝T_CTFCDIV L _i , where MOD and DIV are respectively modulo and integer division operations; add 1 to i and execute the next cycle until i =I Obtain TFI _I . The present invention skillfully utilizes the internal relationship between TFI and CTFC of each transmission channel, and completes the analysis from CTFC to TFI through simple calculation.

Description

A method of parsing from the transmission format combination calculation value to the transmission format indication

technical field

The present invention relates to the technical field of mobile communication with channel multiplexing, in particular to the third generation of Time Division-Sync Code Division Multiple Access (Time Division-Sync Code Division Multiple Access) (hereinafter referred to as TD-SCDMA) and Wideband Code Division Multiple Access (Wideband Code Division Multiple Access) Multiple Access) (hereinafter referred to as WCDMA) mobile communication standards in the transport format combination calculated value (CalculatedTransport Format Combination) (hereinafter referred to as CTFC) to each transport channel (Transport Channel) (hereinafter referred to as TrCH) Transport Format Indicator (Transport Format Indicator) ( Hereinafter referred to as TFI) analysis method.

Background technique

In order to efficiently utilize wireless channel resources, WCDMA and TD-SCDMA mobile communication systems have introduced a transport channel multiplexing mechanism, that is, multiple transport channels are multiplexed into a Code Composite Transport Channel (Code Composite Transport Channel) (hereinafter referred to as CCTrCH), and then Then, the CCTrCH is mapped to the physical channel, thus avoiding the waste of resources caused by allocating at least one physical channel to a single transmission channel because of its low rate.

The transport format (TransportFormat) (hereinafter referred to as TF) of each transport channel participating in a CCTrCH multiplexing is notified to the receiver through a physical layer signaling called Transport Format Combination Indicator (hereinafter referred to as TFCI). Due to the time-varying nature of TF, TFCI is also time-varying (changes every 10ms).

However, the TFCI does not directly indicate the transport format of each transport channel, it only provides necessary index information for the receiver to obtain the transport format of each TrCH. The purpose of doing this is to improve the efficiency of air interface information transmission as much as possible. After obtaining the TFCI, the receiver obtains the value of CTFC by looking up the table, and then analyzes the CTFC according to a certain algorithm to obtain the TFI of each TrCH, and the corresponding transmission format TF can be obtained by looking up the TFI table.

It can be seen that CTFC is a tool for transmission format combination Efficient Signaling (Efficient Signaling), and its introduction makes it more efficient to transmit information on the air interface. The structure of CTFC is described below.

Let I be the number of TrCHs contained in the transport format combination; each transport channel TrCH _i has L _i transport formats, where i=1, 2, ..., I; the transport format indication TFI _i can take L _i values, TFI _i The value of is 0, 1, ..., L _i -1, that is, TFI _i ∈ {0, 1, ..., L _i -1}, where L _i is a positive integer.

Define a positive integer P _i =L ₀ ·L ₁ ·...·L _i-1 , i=1, 2,..., I; I is an integer, and L ₀ =1.

Let Transport Format _Combination (hereinafter _referred to as TFC ₎ be TFC (TDI _{1 ,} TFI ₂ , _. The corresponding CTFC (TFI ₁ , TFI ₂ , ..., TFI _I ) is calculated by the following formula:

$\mathrm{<span\; class="notranslate">\; CTFC</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; TFI</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; TFI</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; TFI</span>}}_{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; I</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; TFI</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

For the downlink common channel, "TrCH _i " is numbered in ascending order starting from 1, and the order is the order listed in the system information (SYSTEM INFORMATION) message.

In other cases, for each separate TFCI field, "TrCH _i " are numbered in ascending order starting from 1, in ascending order of the transport channel identities of the channels mapped to the TFCI field.

The above method shows how to construct the corresponding CTFC according to the TFC transmission format combination TFC (TFI ₁ , TFI ₂ , ..., TFI _I ) of each transmission channel TFI 1 , TFI 2 , and the transmission format number L _i of each transmission channel TrCH _i , so as to realize the multiplexing of transmission channels. A valid indication of the format used.

After obtaining a CTFC value through the TFCI, the receiver needs to parse out the TFC (TFI ₁ , TFI ₂ , ..., TFI _I ). Currently, the CTFC construction method is given in the Radio Resource Control (RRC) layer specification of WCDMA and TD-SCDMA, but the analysis method is not given in the specification.

There are mainly two published CTFC analysis methods. One is the table look-up method, and its principle is as follows: According to the above-mentioned CTFC construction method, in the current CCTrCH configuration, there is a unique TFC (TFI ₁ , TFI ₂ , . . . , TFI _I ) corresponding to it. All possible CTFC values and their corresponding TFCs (TFI ₁ , TFI ₂ , ..., TFI _I ) form a table. As long as the receiver forms this table in advance, after obtaining CTFC through TFCI, look up the table to get the current transmission Format combination TFC.

Obviously, this method is not desirable. First, when the number of transmission channels I participating in the multiplexing and the number of transmission formats L _i of the transmission channel TrCH _i are very large, the lookup table will be very large, resulting in the calculation time and storage required for generating the table. The storage space required for query tables is greatly increased. Secondly, since the configuration of the CCTrCH may change during the communication process, and the number of transmission formats of the transmission channel is not fixed, the receiver needs to generate a lookup table in real time, which is a great burden on the receiver. It can be said that the look-up table method is the least efficient method.

Another method is to directly use the inverse process generated by CTFC to obtain TFC. It can be seen from the construction method of CTFC:

$\mathrm{<span\; class="notranslate">\; CTFC</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; TFI</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; TFI</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; \&CenterDot;</span><span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; TFI</span>}}_{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; I</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; TFI</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}$

Rewrite the above formula as:

CTFC(TFI ₁ , TFI ₂ , ..., TFI _I ) = TFI ₁ ·P ₁ TFI ₂ ·P ₂ +...+TFI _I ·P _I (2)

This method first calculates the values of P ₁ , P ₂ ,..., _PI , and then calculates the transmission format combination of the transmission channel by repeatedly calculating the quotient and remainder of dividing CTFC by the positive integer P _i from large to small. TFI _i is the quotient obtained each time. This method takes advantage of the characteristics of CTFC and is more practical, but it still needs to ask for the values of intermediate variables P ₁ , P ₂ ,..., P _I , which seems a bit cumbersome.

Contents of the invention

In view of the above, the purpose of the present invention is to provide a simpler method to directly obtain TFC (TFI ₁ , TFI ₂ , . . . , YFI _I ).

The analytical method for realizing the transmission format combination calculation value to the transmission format indication proposed by the present invention is to use the transmission format combination calculation value CTFC to analyze the transmission format combination TFC (TFI ₁ , TFI ₂ , ..., TFI ₁ ), which is characterized in that the algorithm is complex The degree is small, including the following processing steps:

Step 1. The receiver obtains the calculated value CTFC of the transport format combination, the number I of transport channels, and the transport format numbers L ₁ , L ₂ , ..., L _I of each transport channel through the physical layer signaling of the transport format combination indication TFCI;

Step 2, setting the initial values of the intermediate variable T_CTFC and the loop variable i to be the transmission format combination calculation value CTFC and 1 respectively, namely T_CTFC=CTFC, i=1;

Step 3. First, the intermediate variable T_CTFC and the transmission format number L _i of the transmission channel are modulo-calculated, and the value is assigned to the transmission format indicator TFI _i of each transmission channel, namely

TFI _i = T_CTFC MOD L _i ; (3)

Then, the intermediate variable T_CTFC is divided by the transmission format number L _i of the transmission channel, and the value is assigned to the intermediate variable T_CTFC, namely

T_CTFC=T_CTFC DIV L _i ; (4)

After that, add 1 to the loop variable i and assign the value to i, ie

i=i+1; (5)

Finally, it is judged whether the loop variable i is less than or equal to the number of transmission channels I, if so, step 3 is performed, otherwise step 4 is performed;

Step 4. Obtain the transport format combination TFC (TFI ₁ , TFI ₂ , . . . , TFI _I ), and end the operation.

The present invention skillfully utilizes the internal relationship between TFI and CTFC of each transmission channel, and completes the analysis from CTFC to TFI through simple calculation. In a word, the analysis method from the transmission format combination calculation value to the transmission format indication provided by the present invention is simple and direct, and has the characteristics of low algorithm complexity.

The specific implementation of the method of the present invention will be further described in detail below in conjunction with the accompanying drawings. The above and other objects, features and advantages of the present invention will be apparent to those skilled in the art from the description of the method of the present invention.

Description of drawings

Fig. 1 is a processing flow chart of the analysis method from the transmission format combination calculation value to the transmission format indication according to the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a processing flow chart of the analysis method from the transmission format combination calculation value to the transmission format indication according to the present invention. As shown in Figure 1, the analysis method of the present invention to realize the transmission format combination calculation value to the transmission format indication is specifically divided into the following processing steps:

Step 1, the receiver obtains the value of the calculated value CTFC of the transport format combination, the number I of transport channels, and the number of transport formats L ₁ , L ₂ ..., L ₁ of each transport channel through the physical layer signaling of the transport format combination indication TFCI;

Step 2, setting the initial values of the intermediate variable T_CTFC and the loop variable i to be the transmission format combination calculation value CTFC and 1 respectively, namely T_CTFC=CTFC, i=1;

Step 3. First, the intermediate variable T_CTFC and the transmission format number L _i of the transmission channel are modulo-calculated, and the value is assigned to the transmission format indicator TFI _i of each transmission channel, namely

TFI _i = T_CTFC MOD L _i ;

Then, the intermediate variable T_CTFC is divided by the transmission format number L _i of the transmission channel, and the value is assigned to the intermediate variable T_CTFC, namely

T_CTFC=T_CTFC DIV L _i ;

After that, add 1 to the loop variable i and assign the value to i, ie

i=i+1;

Finally, it is judged whether the loop variable i is less than or equal to the number of transmission channels I, if so, step 3 is performed, otherwise step 4 is performed;

Step 4. Obtain the transport format combination TFC (TFI ₁ , TFI ₂ , . . . , TFI _I ), and end the operation.

Wherein, the above-mentioned method is derived based on the characteristics of the above-mentioned transmission format combination calculation value CTFC itself, and according to the construction method of CTFC, that is, according to the above-mentioned P _i =L ₀ ·L ₁ ·...·L _i-1 and formula (2), It can be seen

CTFC (TFI ₁ , TFI ₂ , ..., TFI _I ) = TFI ₁ +TFI ₂ ·L ₁ +TFI ₃ ·L ₁ ·L ₂

+...+TFI _I L ₁ L ₂ ... L _I-1 (6)

The above-mentioned transport format combination calculation value CTFC is essentially the sum of numbers formed by transforming the transport format indication TFI of each transport channel (this transformation is necessary to ensure the uniqueness of the correspondence between CTFC and TFC). Once the value of CTFC falls in the interval [0, L ₁ ), it is easy to judge that the value of CTFC is composed of TFI ₁ , that is, only the transmission format of TrCH ₁ is non-zero; once it falls in the interval [L ₁ , L ₁ +L ₁ ·L ₂ ), the CTFC consists of TFI ₁ and TFI ₂ , that is, only the transmission formats of TrCH ₁ and TrCH ₂ are non-zero, and so on. The analysis method is deduced according to the above formula (6):

I=1, can get:

$\mathrm{<span\; class="notranslate">\; CTFC</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="TFI"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">TFI</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \&DoubleRightArrow;</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="TFI"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">TFI</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; CTFC</span>}$

I=2, can get:

$\mathrm{CTFC}={\mathrm{<figure-callout\; id="1"\; label="TFI"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">TFI</figure-callout>}}_1+{\mathrm{TFI}}_2\&Center\; Dot;{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">L</figure-callout>}}_1\&DoubleRightArrow;{\mathrm{<figure-callout\; id="1"\; label="TFI"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">TFI</figure-callout>}}_1={\mathrm{<figure-callout\; id="1"\; label="CTFCMODL"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">CTFCMODL</figure-callout>}}_1,$ TFI ₂ = CTFC DIVL

I=3, can get:

TFI ₁ = CTFC MOD L ₁ , T_CTFC = CTFC DIV L ₁

TFI ₂ = T_CTFC MOD L ₂ , TFI ₃ = T_CTFC DIV L ₂

For any I>3, we can get

then there is ${\mathrm{<figure-callout\; id="1"\; label="TFI"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">TFI</figure-callout>}}_1=\mathrm{<figure-callout\; id="1"\; label="CTFCMOD\; L"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">CTFCMOD</figure-callout>}{L}_{}{}_1,T\_\mathrm{<figure-callout\; id="1"\; label="CTF\; C"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">CTF</figure-callout>}{C}_{}{}_1\&DoubleLeftArrow;\mathrm{<figure-callout\; id="1"\; label="CTFCDIV\; L"\; filenames="H2005100644762E00011.png"\; state="\{\{state\}\}">CTFCDIV</figure-callout>}{L}_{}{}_1$

TFI ₂ =T_CTFC ₁ MOD L ₂ , T_CTFC ₂ =T_CTFC ₁ DIV L ₂

…

TFI _I-1 = T_CTFC _I-2 MOD L _I-1

TFI _I = T_CTFC _1-2 DIV L _I-1

According to the above derivation, it can be seen that the analysis method can be obtained only by processing the last TFI, that is, TFI _I. In fact, for any of the above I cases, let T_CTFC _I-1 = T_CTFC _I-2 DIV L _I-1 , then TFI _I = T_CTFC _I-1 MOD L _I . Using the idea of recursion, it is obvious to implement the parsing method.

The following will be described in conjunction with a specific embodiment. Assume that the four transmission channels TrCH ₁ , TrCH ₂ , TrCH ₃ , and TrCH ₄ participating in the combination correspond to L ₁ =6, L ₂ =5, L ₃ =2, and L ₄ =2, respectively. The Transport Format Set (TFS for short) of the above four transport channels is shown in Table 1. The transport format includes a dynamic part and a static part. Here, only the transport block and the transport set of the dynamic part are used for simple representation.

Table I:

TFI TrCH₁ TrCH₂ TrCH₃ TrCH₄ TF0＝0 (0×81) (0×103) (0×60) (0×144) TF1=1 (1×39) (1×53) (1×60) (1×144) TF2=2 (1×42) (1×63) N/A N/A TF3=3 (1×55) (1×84) N/A N/A TF4＝4 (1×75) (1×103) N/A N/A TF5＝5 (1×81) N/A N/A N/A

Calculate the CTFC value corresponding to each TFC according to formula (6), as shown in Table 2.

Table II:

TFCS No. TFC CTFC TFC1 (TF0, TF0, TF0, TF0) 0 TFC2 (TF1, TF0, TF0, TF0) 1 TFC3 (TF2, TF1, TF0, TF0) 8 TFC4 (TF3, TF2, TF0, TF0) 15 TFC5 (TF4, TF3, TF0, TF0) twenty two TFC6 (TF5, TF4, TF1, TF0) 59 TFC7 (TF0, TF0, TF0, TF1) 60 TFC8 (TF1, TF0, TF0, TF1) 61 TFC9 (TF2, TF1, TF0, TF1) 68 TFC10 (TF3, TF2, TF0, TF1) 75 TFC11 (TF4, TF3, TF0, TF1) 82 TFC12 (TF5, TF4, TF1, TF1) 119

Now suppose that the CTFC corresponding to the TFCI received by the receiver is 119, which is the last item in Table 2. Follow the steps above to get:

A. According to step 1, it can be obtained: CTFC=119, I=4, L ₁ =6, L ₂ =5, L ₃ =2, L ₄ =2;

B, can obtain according to step 2: T_CTFC=119, i=1;

C. According to step 3, you can get:

TFI ₁ = 119 MOD 6 = 5, T_CTFC = 119 DIV 6 = 19, i = 2;

TFI ₂ = 19 MOD 5 = 4, T_CTFC = 19 DIV 5 = 3, i = 3;

TFI ₃ = 3 MOD 2 = 1, T_CTFC = 3 DIV 2 = 1, i = 4;

TFI ₄ = 1 MOD 2 = 1, T_CTFC = 1 DIV 2 = 0, i = 5;

D. TFC (5, 4, 1, 1) can be obtained according to step 4, that is, TFC (TF5, TF4, TF1, TF1) in Table 2.

Although the present invention has been disclosed above with a preferred embodiment, this is only a vivid example for easy understanding and should not be regarded as limiting the scope of the present invention. Similarly, any ordinary professional in the technical field can make various possible equivalent changes or replacements according to the technical solution of the present invention and the description of its preferred embodiments, but all these changes or replacements should belong to the scope of the present invention. The scope of the claims.

Claims (1)

1. An analytic method for realizing transmission format combination calculation value to transmission format indication, is characterized in that comprising following processing steps: Step 1. The receiver obtains the calculated value CTFC of the transmission format combination, the number I of transmission channels, and the values of the transmission format numbers L ₁ , L ₂ ..., L ₁ of each transmission channel through the physical layer signaling indicated by the transmission format combination; Step 2. Set the initial values of the intermediate variable T_CTFC and the loop variable i to be the transmission format combination calculation value CTFC and 1 respectively; Step 3, at first, carry out the modulus operation with the transmission format number L _i of the intermediate variable T_CTFC of the transmission channel, and assign the value to the transmission format indication TEI _i of each transmission channel, that is, TFI _i =T_CTFCMODL _i ; then, the intermediate variable T_CTFC and the number of transmission formats L _i of the transmission channel perform an integer division operation, and assign the value to the intermediate variable T_CTFC, that is, T_CTFC=T_CTFC DIVL _i ; after that, add 1 to the loop variable i, and assign the value to i, that is, i=i +1; Finally, judge whether the loop variable i is less than or equal to the number of transmission channels I, if so, execute step 3, otherwise execute step 4; Step 4. Obtain the transport format combination TFC (TFI ₁ , TFI ₂ , . . . , TFI _I ) indicated by the transport format of one transport channel, and end the operation.

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