KR100830456B1 - Method for scrambling physical channel transmission format and apparatus for transmitting physical channel transmission format information - Google Patents

Abstract

The present invention relates to transmitting physical channel transmission format information. Particularly, when a transmitting and receiving end transmits and receives a physical channel having various formats, the present invention scrambles and transmits a transmission format, and the receiving end efficiently detects the transmission format of the physical channel. The present invention relates to a physical channel transmission format scrambling method and an apparatus for transmitting physical channel transmission format information. Such a physical channel transmission format scrambling method includes a mask including information of the variable length transmission format when generating a physical channel having a variable length transmission format at a transmitting side and transmitting arbitrary data to a receiving side. Scramble and transmit according to the information.

Blind Format, Scrambling

Description

Method for scrambling physical channel transmitting format and device for transmitting physical channel transmitting format information

1 is a block diagram of a transmission chain of a typical F-SPDCCH

2 is a block diagram of a transport chain block of an F-SPDCCH according to the present invention.

3 shows a first embodiment of the scrambler shown in FIG.

4 is a diagram illustrating a scrambling format insertion state for a long code according to the first embodiment of the present invention.

FIG. 5 shows a second embodiment of the scrambler shown in FIG.

The present invention relates to transmitting physical channel transmission format information. Particularly, when a transmitting and receiving end transmits and receives a physical channel having various formats, the present invention scrambles and transmits a transmission format, and the receiving end efficiently detects the transmission format of the physical channel. The present invention relates to a physical channel transmission format scrambling method and an apparatus for transmitting physical channel transmission format information.                         

In some types of wired and wireless communication systems, a specific physical channel may be transmitted in various formats, but the receiving side may need to receive the channel without clear information about the transmission format. Therefore, the receiving end should perform blind format detection. An example of such a system is the 1x-EVDV system (Cdma2000-Revision-C), which is being developed as a next generation mobile communication system.

In the 1x-EVDV system, multiple F-SPDCCHs are used to transmit control information of the F-PDCH, which is a physical channel for transmitting packet data.

That is, conventional wireless communication systems for packet data transmission use physical channels such as a packet data channel (PDCH) and a packet data control channel (PDCCH) for packet data transmission. .

The PDCH is actually a channel for transmitting packet data to be transmitted to the corresponding terminal (or user, hereinafter referred to as terminal).

The PDCCH includes control information that enables the terminal to properly receive data transmitted through the PDCH without error. Here, PDCCH uses two types of Primary PDCCH (PPDCCH) and Secondary PDCCH (SPDCCH). Among them, SPDCCH is essentially used, and PPDCCH is selectively used.

In this case, the SPDCCH is a control channel for using a packet data channel (PDCH) as a forward channel. The SPDCCH transmits information necessary for decoding in order to decode data transmitted through the PDCH at the receiving end.                         

Basically, current SPDCCH is 6 ~ 8bit cyclic redundancy checking (CRC) bit to check various information necessary for decoding of 13 ~ 21bit and the reception error of this information. bit) and an 8-bit convolutional encoder tail bit.

A total of 27 to 37 bits of information thus constructed is convolutional coding of 1/2 or 1/4, and 54 to 64 bits of coded bit (for 1/2 coding) or 108 Produces ~ 128bit of coded bit (1/4 coding).

Hereinafter, a puncturing method of code bits according to the prior art will be described with reference to the accompanying drawings.

1 is a configuration diagram of a transmission chain block of a general F-SPDCCH.

The data (input sequence) transmitted on the general F-SPDCCH is added with an error detection code such as a CRC code in the error detection code addition block 101.

The bit to which the CRC code is added is added with tail bits for sending the final state of the encoder to a known termination in the tail bit addition block 102.

The bits to which the tail bits are added are encoded by the convolutional code in the encoder 103.

The encoded bits generated through this process are repeated in the symbol repetition block 104 according to the length of a slot to be transmitted, and the repeated bits are punctured in the puncturing block 105.

For example, due to the limitation of the number of Walsh codes available in 1x EVDV systems, the SPDCCH uses Walsh codes of 64 chips in length. Therefore, the number of coded bits per slot is 48 bits.

In the SPDCCH, since slots used for transmission are 1, 2, or 4 slots, 48 coded bits are used for 1 slot and 96 slots are used for 2 slot. A coded bit and 4 slot lengths contain 192 coded bits.

For example, as shown in FIG. 1, in the case of an 8-bit CRC and an 8-bit encoder tail bit with 18 bits of information bits, a total of 34 bits of information is transmitted for one slot. If it is, the half-encoding is performed and 68 bits of coded bits are generated. That is, the puncturing block 105 is punctured according to the length of the slot to transmit.

That is, since 48 coded bits are transmitted in one slot length, 48-coded bits are stored in one slot after 68-48 = 20, that is, puncturing by 20 bits. Is sent via).

At this time, if the same information amount is transmitted in 4 slots, as shown in FIG. 1, 136 coded bits are generated through 1/4 coding, and 272 bits are generated through symbol repetition. Serve Since the 272 bits of information should be transmitted in 4 slots, that is, 192 bits, 272-192 = 80 bits are punctured to divide 192 bits into 4 slots.

The punctured bits are interleaved in the block interleaver 106 and modulated by the QPSK scheme in the modulator 107. This modulated signal is separated into I and Q channels using some of the Walsh codes.

At this time, as described above, the transmission length of the F-SPDCCH may be 1 slot, 2 slots, or 4 slots, where the slot means a time unit of 1.25 msec. At this time, the transmitting end does not inform the receiving end of the length of the F-SPDCCH being transmitted. That is, the receiving end can not clearly know what format. Therefore, the receiver performs a decoding process for all three formats (three lengths: one slot, two slots, and four slots) to know what the transmission length (or format) of the received F-SPDCCH is. Check it.

At this time, it is determined that the format determined as CRC = 1 is the correct format.

Here, CRC = 1 means that there is no error in the data transmitted on the F-SPDCCH through the CRC check. On the contrary, CRC = 0 means a case where it is determined that there is an error in data transmitted on the F-SPDCCH through the CRC check.

In the prior art, when the receiver determines the format of the transmission channel using only the CRC, the CRC may have a value of 1 for two or more types of formats. In this case, the receiver cannot determine exactly what kind of format the received format is. Therefore, another additional device is needed to minimize the occurrence of such a case.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and allows a wired / wireless transmitter to scramble and transmit format information when transmitting data through a specific physical channel. It is an object of the present invention to provide a physical channel transmission format scrambling method and a physical channel transmission format information transmission apparatus capable of accurately determining a format type.

According to one aspect of the present invention as described above, when the transmitting side generates a physical channel having a variable length transmission format and transmits arbitrary data to the receiving side, the arbitrary data includes information of the variable length transmission format. Scrambled according to the mask information and transmitted.

Preferably, the scrambling comprises: an error detection code addition block for adding an error detection code to the data, a tail bit addition block for adding tail bits for indicating a final state of an encoder encoding the data to the data; A convolutional encoder for encoding data having tail bits added to the convolutional code, a symbol repetition block for symbol repetition according to a length of a slot for transmitting the encoded bits, and a puncture for puncturing the symbol repeated bits And a scrambling to data or output bits output from any one of a processing block, a block interleaver interleaving the punctured bits, and a modulation block modulated according to the transmission-side modulation scheme.

The transmitter further includes a scrambler for the scrambling, wherein the scrambler is composed of one of a long code generator or a transition resist.                         

Preferably, when the long code generator is used, field 0, field 1, field 3, and field 4 of the long code field of the long code fields are referred to as X, and the transport format information codes are referred to as L2, L1, and L0. time,

It has a long code pattern of XXXXXXXXXXXXXXXXXXXXXL2L1L0XXXXXXXXXXXXXXXXXXXX.

According to another aspect of the present invention, in the transmission chain for transmitting arbitrary data through a physical channel having a variable length transmission format at the transmitting side, the arbitrary data includes the information of the variable length transmission format And a scrambler that scrambles using mask information.

Preferably, the scrambler is carried out using either a long code generator or a transition resist.

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In one aspect of the present invention, a wireless communication method using a communication channel for transmission of packet control data having one or more slots, the method comprising: scrambling the packet control data with a scrambling sequence generated using the number of slots in a scrambler And transmitting the scrambled packet control data.
In another aspect of the present invention, a wireless communication system including a transmitting device for transmitting packet control data having one or more slots, comprising: a scrambler for scrambled the packet control data with a scrambling sequence generated using the number of slots; And a transmitter for transmitting the scrambled packet control data.
In the two aspects of the present invention described above, the number of slots is variable and the length of the slots can be fixed. The method may further include descrambling the scrambled packet control data in a descrambling sequence that does not depend on the number of slots, or may further include a descrambler at a receiving end.
The scrambling sequence is generated using the output bits of the scrambler and the number of slots of the packet control data, and the descrambling sequence is generated using the output bits of the descrambler, and the output bits of the scrambler and the The output bits of the descrambler may coincide with each other.
Further, the scrambling sequence may be generated according to the number of slots and the system time of a slot unit, and the scrambling sequence may be generated according to different long code masks based on the number of slots, and the number of slots is 1 It may consist of any one of two, two and four slots.
Meanwhile, an error detection code is added to the packet control data, a tail bit is added to the packet control data to which the error detection code is added, the packet control data to which the tail bit is added is encoded, and the packet control data is encoded to match the transmission slot length. The interleaved data may be modulated and transmitted by performing symbol repetition or puncturing and interleaving the symbol repetition or punctured packet control data.
Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.
2 is a block diagram of a transport chain block of an F-SPDCCH according to the present invention.

The transport chain block of the F-SPDCCH according to the present invention shows the F-SPDCCH used for transmitting control information of the F-PDCH, which is a physical channel for transmitting packet data in the 1x-EVDV system. Assume that two SPDCCHs are used, namely F-SPDCCH0 and F-SPDCCH1. In addition, it is assumed that there are three types of transmission formats that each F-SPDCCH may have according to transmission lengths (1 slot, 2 slots, and 4 slots). The format is called FM (i, N). In this case, i = 0, 1 in FM (i, N) mean F-SPDCCH0 and F-SPDCCH1, and N = 1, 2, and 4 mean 1 slot, 2 slot, and 4 slot, respectively. This assumption is only for convenience of explanation, and even if the system has a different number of channels or formats to be distinguished, the contents of the present invention may be naturally applied.

The block configuration of the F-SPDCCH transmission chain shown in FIG. 2 is similar to that of FIG. 1, but the receiver adds a scrambler 109 for error-free blind format detection for the F-SPDCCH, and a scrambler. Is driven using the format information according to a preset principle.

Here, the scrambler 109 is a device that generates 0 and 1 relatively randomly. The addition position of the scrambler 109 can be any one of P1, P2, P3, P4, P5, P6, and P7 shown in FIG.

2 illustrates a case in which the scrambler 109 is added to the P7 portion.

In FIG. 2, Mask (i, N) is a variable having a 1: 1 correspondence with FM (Format) (i, N), and serves to generate an output of the scrambler 109 differently according to a channel format.

3 is a diagram illustrating a first embodiment of the scrambler shown in FIG. 2, and FIG. 4 is a diagram illustrating a scrambling format insertion state for a long code according to the first embodiment of the present invention.

In FIG. 3, a long code generator used by an existing code division multiple access (CDMA) system is used to implement the scrambler 109 shown in FIG.

The long code generator 109a shown in FIG. 3 generates output bits at a high chip rate, and the scrambling bit extractor 109b extracts only necessary bits among the bits output at high speed from the long code generator 109a. do. The scrambling bit repeater 109c repeats the output of the scrambling bit extractor 109b as necessary to be added as needed. In this case, Mask (i, N) has a 1: 1 correspondence with FM (i, N), and has the same operation principle as that of a conventional long code mask.

FIG. 4 is an example of Mask (i, N) when the polynomial that defines the characteristics of the long code generator 109a shown in FIG. 3 is 42th order. Field 0, field 1, field 3, and field 4 are used systems. Fixed at a specific number distinguishable from other channels. And, field 2 is a value previously promised according to FM (i, N).

Table 1 shows some examples.

FM (0,1) FM (0,2) FM (0,4) FM (1,1) FM (1,2) FM (1,4) L2 L1 L0 000 001 010 100 101 110 First example 000 001 010 011 100 101 2nd example 000 001 010 000 001 010 Third example

FIG. 5 is a diagram illustrating a second embodiment of the scrambler shown in FIG. 2.

5 may use a conventional shift register to implement the proposed sccrambler.

5 is an exemplary diagram when the polynomial that defines the transition register is h (D) = D ¹⁷ + D ¹⁴ +1, and Mask (i, N) corresponds to FM (i, N) 1: 1. Is used to initialize the memory value of the transition register.

As an example of Mask (i, N) related to FIG. 5, it may be represented as follows.

Mask (i, N) = (1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 L2 L1 L0) ------ (1)

Here, as an example of the value of (L2 L1 L0) of (1), the values in Table 1 may be used.

As another example of Mask (i, N) related to FIG. 5, time information may be added to Mask (i, N) as follows.

Mask (i, N) = (1 1 1 1 1 1 1 1 1 1 1 1 1 T1 T0 L2 L1 L0) ------ (2)

Here, the values in Table 1 may be used as an example of the value of (L2 L1 L0) in (2). Also, (T1 T0) in (2) is a variable according to the current transmission time. As an example, assume that the current transmission slot time is called Slot (t) and that the value of Slot (t) is any one of {0, 1, 2, ..., 14, 15}. If Val = (Slot (t)% 4), Val has any one of {0, 1, 2, 3}, and the relationship between T1 and T0 and Val can be defined as shown in Table 2. have.

Val 0 One 2 3 T1 T0 00 01 10 11

In the above description, the present invention has been described by taking SPDCCH, which is one of the forward channels as an example, but it is possible to make various modifications and changes without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

In the blind format scrambling method and detection method according to the present invention, by scrambling and transmitting a variable-length physical channel transmission format to transmission data, accurate format detection is possible at the receiving side, thereby reducing waste of resources used in the transmitted channel. As a result, there is an effect that can improve the overall performance of the system.

Claims (15)

A wireless communication method using a communication channel for transmission of packet control data having one or more slots, the method comprising: Scrambled the packet control data with a scrambling sequence generated using the number of slots in a scrambler; And Transmitting the scrambled packet control data Wireless communication method comprising a. The method of claim 1, Wherein the number of slots is variable and the length of the slots is fixed. The method of claim 1, And descrambling the scrambled packet control data in a descrambling sequence that does not depend on the number of slots in a descrambler of a receiving end. The method of claim 3, wherein The scrambling sequence is generated using the output bits of the scrambler and the number of slots of the packet control data, The descrambling sequence is generated using output bits of the descrambler, And an output bit of the scrambler and an output bit of the descrambler coincide with each other. The method of claim 1, The scrambling sequence is generated according to the number of slots and the system time of a slot unit. The method of claim 1, The scrambling sequence is generated according to different long code masks based on the number of slots. The method of claim 1, The number of slots is a wireless communication method consisting of any one, two and four slots. The method of claim 1, Adding an error detection code to the packet control data; Adding tail bits to packet control data to which the error detection code is added; Encoding packet control data to which the tail bits are added; Performing symbol repetition or puncturing on the encoded packet control data to match a transmission slot length; Interleaving the symbol repetition or punctured packet control data; And And modulating the interleaved data. A wireless communication system comprising a transmitter for transmitting packet control data having at least one slot, A scrambler that scrambles the packet control data with a scrambling sequence generated using the number of slots; And Transmitter for transmitting the scrambled packet control data Wireless communication system comprising a. The method of claim 9, Wherein the number of slots is variable and the length of the slots is fixed. The method of claim 9, And a descrambler for descrambling the scrambled packet control data in a descrambling sequence that does not depend on the number of slots. The method of claim 9, The scrambling sequence is generated according to the number of slots and the system time of a slot unit. The method of claim 9, The scrambling sequence is generated according to different long code masks based on the number of slots. The method of claim 9, And the number of slots is any one of one, two, and four slots. The method of claim 9, An error detection code addition module for adding an error detection code to the packet control data; A tail bit addition module for adding tail bits to packet control data to which the error detection code is added; An encoder for encoding packet control data plus the tail bits; A symbol repetition module for performing symbol repetition on the encoded packet control data to fit a transmission slot length; A puncturing module for puncturing the encoded packet control data to fit the transmission slot length; An interleaver for interleaving the symbol repetition or punctured packet control data; And And a modulator to modulate the interleaved data.

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