KR100331879B1 - Receiver for common packet channel and method for receiving signal using the same - Google Patents

Abstract

The present invention relates to the next generation of mobile communication, and more particularly, to a receiver of a common packet channel and a signal receiving method thereof. The receiver of the common packet channel according to the present invention includes a first code information generator for generating scrambling code information for despreading the common packet channel according to the received access preamble signature, and message information of the received random access channel. A second code information generator for generating scrambling code information for despreading of a dedicated physical channel according to the present invention, a mode selector for selecting and outputting any one of the generated code information according to an operation mode, and outputting from the mode selector By using the decoder to decode any one of the received common packet channel and the dedicated physical channel by using the scrambling code information, the decoder of the dedicated physical channel (DPCH) can be used together, thereby reducing hardware complexity and easy implementation. .

Description

Receiver for common packet channel and method for receiving signal using the same}

The present invention relates to next generation mobile communication, and more particularly, to a receiver of a common packet channel and a signal receiving method thereof.

1 is a block diagram illustrating a receiver of a conventional common packet channel.

Referring to FIG. 1, a despreader 100 multiplying a scrambling code by a scrambling code and a message portion of a received common packet channel receives a despread message portion, and separates the despread message portion into a data portion and a control portion. And a plurality of decoders 120 to 140 that multiply and decode the separated signals by a channelization code, and inform the decoders 120 to 140 of the structure of the received common packet channel. It consists of a physical common packet channel determiner 110 to generate a.

Here, the despreader 100 is composed of a scrambling code generator 102 for generating a scrambling code, and a mixer 101 for multiplying the generated scrambling code by a message portion of a received common packet channel to despread.

The decoders 120 to 140 further include a data portion channelization code generator 121 for generating a channelization code for the data portion, a control portion channelization code generator 124 for generating a channelization code for the control portion, The mixer 122 which multiplies and dechannels the message portion output from the despreader 100 by the channelization code generated by the data portion channelization code generator 121 and the message output from the despreader 100. The mixer 123 multiplies the channelization code generated by the control part channelization code generator 124 to dechannel the portion, the buffer 125 temporarily storing the dechannelized data portion, and the dechannelized data. A control part decoder 126 for decoding a control part and a data part decoder 127 for decoding the data part stored in the buffer 125 according to the spreading ratio SF found by the control part decoder 126. do.

The operation of the conventional common packet channel receiver configured as described above is as follows.

The conventional common packet channel receiver is largely composed of one despreader 100 and 16 decoders 120 to 140.

Since the sixteen decoders 120 to 140 all play the same role, the following describes only the operation of one decoder.

First, despreader 100 despreads by multiplying the scrambling code by the message portion of the received physical common packet channel. The scrambling code used at this time is already determined for each cell.

The despread message portion is simultaneously input to 16 decoders 120 to 140, and the message portion input to each decoder 120 to 140 is divided into an I channel, which is a data portion, and a Q channel, which is a control portion. It is dechannelized into a channelization code and a control partial channelization code.

In this case, the data partial channelization code and the control partial channelization code used are different codes for each physical common packet channel, and these are generated by the respective channelization code generators 121 and 124.

Here, the channelization code is determined according to which structure the physical common packet channel is selected and used in the access step. That is, the mobile station selects one of sixteen access preamble signatures in the access step to transmit a physical common packet channel, and the physical common packet channel determiner 110 of the receiver receives the received channel structure information and the received channel structure information. The access preamble signature of the physical common packet channel is compared to sense the structure of the received physical common packet channel, and the information is transmitted to each of the decoders 120 to 140.

Then, the channelization code generators 121 and 124 of the decoders 120 to 140 generate corresponding channelization codes according to the channel structure information provided by the physical common packet channel determiner 110, thereby inverse channel of the message portion. Proceed to anger.

On the other hand, since the decoders 120 to 140 do not know the exact spreading ratio (SF) in the dechannelized data portion, first, the data portion is coded using a code corresponding to the minimum spreading ratio (SF _min ) of each physical common packet channel. Partial decoding is temporarily stored in the buffer 125.

In addition, the control portion decoder 126 decodes the dechannelized control portion to find an accurate spread ratio SF, and then transmits this information to the data portion decoder 127 to finally transmit the information to the data portion decoder 127. Complete the decoding of the data part.

Thus, the data portion decoder 127 outputs the decoded packet data.

However, such a conventional common packet channel receiver has the following problems.

First, since a channelization code of a receiver of a conventional common packet channel is different for each physical common packet channel, a channelization code generator for generating a different channelization code according to a channel structure must be provided, and a structure of a physical common packet channel is also provided. Determinants must be provided to determine the hardware burden, unlike random access channels (RACH) or dedicated physical channels (DPCH).

Secondly, as described above, the conventional common packet channel receiver has a different structure from that of other physical channels, and thus cannot be shared with each other, thereby complicating the structure of the overall channel receiver.

Accordingly, an object of the present invention is to provide a receiver of a common packet channel and a signal reception method thereof which can be shared and used with a dedicated physical channel (DPCH).

According to a configuration feature of the present invention for achieving the above object, the receiver of the common packet channel and the first code information generator for generating scrambling code information for the despreading of the common packet channel according to the received access preamble signature And a second code information generator for generating scrambling code information for despreading the dedicated physical channel according to the received random access channel message information, and selecting and outputting any one of the generated code information according to an operation mode. And a mode selector and a decoder for decoding any one of a received common packet channel and a dedicated physical channel using the scrambling code information output from the mode selector.

Preferably, the decoder is configured to generate a scrambling code for despreading any one of a common packet channel and a dedicated physical channel according to the scrambling code information output from the mode selector, and the generated scrambling code A first mixer for despreading any one of the received common packet channel and the dedicated physical channel, a second code generator for generating a channelization code for dechannelization of the data portion, and outputted from the first mixer A second mixer which dechannelizes the data portion of the I channel of the signal by the channelization code generated by the second code generator, a buffer for temporarily storing the dechannelized data portion, and an output from the first mixer A first decoder for decoding a control part of the Q channel of the detected signals to detect a spread rate (SF), and according to the detected spread rate (SF) It consists of a data portion stored in the buffer to the second decoder for decoding end.

According to a method feature of the present invention for achieving the other object as described above, the method of receiving a signal of a common packet channel comprises the steps of receiving an access preamble signature to generate information of the scrambling code mapped to the access preamble signature, Generating a specific scrambling code according to the information of the generated scrambling code and despreading a message portion of the received common packet channel, multiplying the despreaded message portion by a channelization code to dechannel Temporarily storing a data portion of the dechannelized message portion in a buffer, detecting a used spreading rate (SF) by decoding a control portion of the despreaded message portion, and using the detected spreading rate And finally decoding the data portion stored in the buffer.

Advantageously, in the dechannelization step, using a code of node C (spreading rate, spreading rate / 4) in the orthogonal variable spreading rate code tree as the channelization code for the data portion of the despreaded message portion, In the orthogonal variable spreading code tree, the code of node C (256, 0) is used as the channelization code for the control portion of the despread message portion.

1 is a block diagram illustrating a receiver of a conventional common packet channel.

2 is a block diagram illustrating a receiver of a common packet channel according to the present invention.

3 is a detailed block diagram of the receiver shown in FIG. 2;

4 is a diagram for explaining allocation of channelization codes according to the present invention;

5 is a block diagram illustrating a base station equipped with a receiver of a common packet channel according to the present invention.

* Description of the symbols for the main parts of the drawings *

200: common packet channel scrambling code generator

201: dedicated physical channel scrambling code generator

202: mode selector

203: decoder

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

The present invention proposes a receiver of a common packet channel (CPCH) that can be used in common with a dedicated physical channel (DPCH) and a signal receiving method using the same.

To this end, the mobile station maps and transmits a specific scrambling code to an access preamble signature on demand of a common packet channel, and also channelizes a coded code in an OVSF code tree in the same way as a dedicated physical channel (DPCH). Select to use.

That is, in the access phase of the mobile station, 16 access preamble signatures are mapped one-to-one to different scrambling codes. For example, the access preamble signatures of AP # 0 to AP # 15 are mapped to indicate scrambling codes SC # 0 to SC # 15 of the message portion, respectively. As the channelization code of the data portion, the code of the node C (diffusion rate, spreading rate / 4) of the orthogonal variable spreading rate code tree is used, and the channelization code of the control portion C (of the orthogonal variable spreading rate code tree) is used. 256, 0) The code of the node is used.

Accordingly, the receiver can recognize the scrambling code to be used for despreading the common packet channel by receiving the access preamble signature, and can also decode the common packet channel using a decoder having the same structure as the dedicated physical channel (DPCH). .

2 is a block diagram illustrating a receiver of a common packet channel according to the present invention.

Referring to FIG. 2, a receiver of a common packet channel according to the present invention generates a common packet channel scrambling code index generator 200 for generating scrambling code information for despreading a common packet channel (CPCH) according to a received access preamble signature. And a dedicated physical channel scrambling code index generator 201 for generating scrambling code information for despreading the dedicated physical channel DPCH according to the received message information of the random access channel RACH, and according to the operation mode. A mode selector 202 for selecting and outputting any one of the generated code information and a decoded one of the received common packet channel and the dedicated physical channel using the scrambling code information output from the mode selector 202 It consists of a decoder 203.

Meanwhile, a plurality of decoders 203 may be provided according to the number of common packet channels (CPCHs) that can be used in a cell, and FIG. 3 shows a receiver of a common packet channel provided with a plurality of decoders 203. .

Referring to FIG. 3, the plurality of decoders 320, 330, and 340 respectively despread one of a common packet channel and a dedicated physical channel according to the scrambling code information output from the mode selectors 321, 331, and 341. A scrambling code generator 323, 333, 343 for generating a scrambling code, and a first mixer 322, 332, 342 for despreading any one of a received common packet channel and a dedicated physical channel using the generated scrambling code. ), The data portion channelization code generators 324, 334, and 344 for generating a channelization code for dechannelization of the data portion, and the data portion of the despread channel by multiplying the generated channelization code by the inverse. The second mixer 325, 335, and 345 to channelize, the buffers 326, 336, and 346 to temporarily store the dechannelized data portion, and the control portion of the despread channel to decode Control unit to detect SF) Decoders 327, 337 and 347 and data portion decoders 328, 338 and 348 for final decoding of the data portion stored in the buffers 326, 336 and 346 according to the detected spreading ratio SF. .

The operation of the receiver of the common packet channel configured as described above is as follows.

First, the receiver proposed in the present invention has 16 decoders 320 to 340 to simultaneously receive 16 common packet channels (CPCHs), and the decoders 320 to 340 each have a specific common packet channel (CPCH) or A dedicated physical channel (DPCH) is received to perform descaling and dechannelization.

Since the decoders 320 to 340 can be used in common for the common packet channel (CPCH) and the dedicated physical channel (DPCH), the decoder 320 to 340 operates by selecting one of the common packet channel (CPCH) and the dedicated physical channel (DPCH). Mode selectors 321, 331, and 341 are provided respectively. The mode selectors 321, 331, and 341 operate according to RRC (Radio resource control) (not shown) which is an upper layer.

The common packet channel scrambling code index generator 300 receives the access preamble signature and generates scrambling code information of the common packet channel message portion mapped to the access preamble signature to generate the mode selectors 321, 331, and 341. To send).

That is, the common packet panel scrambling code index generator 300 includes a table for mapping each access preamble signature and the index of the scrambling code used in the common packet channel message part to each other. This is because the mobile station maps and transmits a specific scrambling code to the access preamble signature in the access step.

The dedicated physical channel scrambling code index generator 310 obtains information of a scrambling code to be used when despreading the dedicated physical channel (DPCH) according to message information received during the transmission procedure of the random access channel (RACH) and the forward access channel (FACH). It generates and transmits to each mode selector (321, 331, 341).

Then, each mode selector 321, 331, 341 selects and outputs any one of scrambling code information of each channel received under the control of RRC, which is an upper layer. At this time, if the RRC is set to the reception mode of the common packet channel (CPCH), the mode selectors 321, 331, and 341 output scrambling code information for despreading of the common packet channel (CPCH).

Then, each scrambling code generator 323, 333, 343 generates a scrambling code corresponding to the scrambling code information output from each mode selector 321, 331, 341, and each first mixer 322. 332, 342. Despread by multiplying the generated scrambling code by the message portion of the received common packet channel (CPCH).

Then, the message portion of each despread common packet channel (CPCH) is divided into the data portion of the I channel and the control portion of the Q channel, and the data portion of the I channel is the data portion channelization code generator 324, 334, 344. ) Is multiplied by the channelization code of the generated data portion and dechannelized.

At this time, each data partial channelization code generator 324, 334, and 344 channelizes the code of the C (diffusion rate, diffusion rate / 4) node in the orthogonal variable spreading code tree as shown in FIG. Occurs with code

Preferably, the channelization code for the data portion uses 'C (4,1) = 1,1, -1, -1', which is the code corresponding to the minimum spreading ratio SF _min , and accordingly partial decoding (Partial decoding) is performed first and then stored in the buffers 326, 336, and 346. This is because the exact spread rate (SF) for the data portion is not known until decoding on the control portion is made.

On the other hand, the channelization code of the control portion uses the code of the C (256, 0) node in the orthogonal variable spreading rate code tree as shown in FIG. Therefore, since the code of the C (256, 0) node is '111 ..... 1' (1 repeats 256 times), a separate channelization code generator is not needed.

Here, scrambling code planes as shown in FIG. 4 exist for one scrambling code, respectively.

Therefore, the control portion decoders 327, 337, and 347 decode the despreaded control portion to detect the correct spreading ratio SF of the received common packet channel CPCH, and the detected spreading ratio is converted into the data portion decoder. 328, 338, 348).

The data portion decoders 328, 338, and 348 then perform final decoding on the data portions stored in the buffers 326, 336, and 346 according to the diffusion rates detected by the control portion decoders 327, 337, and 347.

On the other hand, since there are up to 16 physical common packet channels (PCPCH) supported per cell, 16 such decoders 320 to 340 are required, but when the number of physical common packet channels (PCPCH) supported per cell is less than 16, Unused decoders 320 to 340 can be used for the dedicated physical channel (DPCH).

The mode selectors 321, 331, and 341 operating under the control of the upper layer output information on the scrambling code of the dedicated physical channel (DPCH), so that the decoders 320 to 340 output the dedicated physical channel (DPCH). By receiving and decoding it.

5 is a block diagram illustrating a base station equipped with a receiver of a common packet channel according to the present invention.

Referring to FIG. 5, the base station processes a radio frequency (RF) signal transmitted from a mobile station (not shown) and outputs a baseband signal, and the base station output from the radio frequency processor 500. A common packet channel / dedicated physical channel decoder 501 which receives and decodes a common packet channel (CPCH) or a dedicated physical channel (DPCH) signal among band signals, and a random baseband signal output from the radio frequency processor 500. Receives a random access channel decoder 502 for receiving and decoding an access channel (RACH) signal, and data output from the common packet channel / dedicated physical channel decoder 501 or data output from the random access channel decoder 502. And a central processing unit 503 for processing.

Here, the signal processed by the central processing unit 503 is transmitted to a switching center (not shown) or to a mobile station or another base station (not shown) accordingly.

The base station configured as described above uses a single decoder in common to decode the common packet channel (CPCH) and the dedicated physical channel (DPCH). At this time, which channel of the common packet channel (CPCH) and dedicated physical channel (DPCH) to decode is determined by the upper layer RRC and controlled.

Accordingly, the common packet channel / dedicated physical channel decoder 501 outputs decoded packet data or voice data, and the random access channel decoder 502 outputs RACH data.

As described above, the receiver of the common packet channel and the signal reception method using the same according to the present invention have the following effects.

First, since a receiver of a common packet channel according to the present invention can use a decoder of a dedicated physical channel (DPCH), hardware complexity is reduced and the implementation is easy.

Secondly, the receiver according to the present invention can select and receive any one of a dedicated physical channel (DPCH) and a common packet channel (CPCH) according to the channel situation, in particular, the size of the base station system is reduced.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (5)

A first code information generator for generating scrambling code information for despreading of a common packet channel according to the received access preamble signature; A second code information generator for generating scrambling code information for despreading the dedicated physical channel according to the received message information of the random access channel; A mode selector for selecting and outputting any one of the generated code information according to an operation mode; And a decoder for decoding any one of a common packet channel and a dedicated physical channel received using the scrambling code information output from the mode selector. The method of claim 1, wherein the decoder, A first code generator for generating a scrambling code for despreading any one of a common packet channel and a dedicated physical channel according to the scrambling code information output from the mode selector; A first mixer for despreading any one of a common packet channel and a dedicated physical channel received using the generated scrambling code; A second code generator for generating a channelization code for dechannelization of the data portion; A second mixer for de-channelizing the data portion of the I channel among the signals output from the first mixer by multiplying the channelization code generated by the second code generator; A buffer for temporarily storing the dechannelized data portion; A first decoder which decodes a control part of a Q channel among the signals output from the first mixer to detect a spread rate (SF); And a second decoder for finally decoding the data portion stored in the buffer according to the detected spreading ratio (SF). Receiving the access preamble signature to generate information of the scrambling code mapped to the access preamble signature; Despreading a message portion of the received common packet channel by generating a specific scrambling code according to the information of the generated scrambling code; Dechanneling by multiplying the despread message portion by a channelization code; Temporarily storing a data portion of the dechannelized message portion in a buffer; Detecting a spreading rate (SF) used by decoding a control portion of the despread message portion; And finally decoding the data portion stored in the buffer by using the detected spreading rate. The method of claim 3, wherein in the dechannelization step, In the orthogonal variable spreading code tree, the code of node C (spreading rate, spreading rate / 4) is used as the channelization code for the data portion of the despread message portion, And using the code of node C (256, 0) in the orthogonal variable spreading code tree as the channelization code for the control portion of the despread message portion. Receiving an access preamble signature to generate information of a scrambling code to be used when decoding a common packet channel; Receiving message information of a random access channel to generate information of a scrambling code to be used when decoding a dedicated physical channel; Selecting and outputting any one of information of each generated scrambling code according to an operation mode; Despreading any one of a received common packet channel and a dedicated physical channel by generating a scrambling code corresponding to the information of the output scrambling code; And de-channelizing and decoding the despread channel.