KR100888505B1 - Apparatus and method for transmitting, and apparatus and method reciving in communication system - Google Patents

Abstract

A transmission apparatus of a communication system in which a physical channel is a combination of a plurality of time domain symbols and a plurality of frequency domain subcarriers, divides data into a plurality of data blocks, and then interleaves the plurality of data blocks, respectively. Then, the plurality of interleaved data blocks are mapped to at least one physical channel and transmitted to the receiving device of the communication system. In this way, time delay due to data interleaving can be reduced.

Subcarriers, symbols, physical channels, transport channels, mapping, interleaving

Description

A transmission apparatus and method of a communication system, and a reception apparatus and a method {APPARATUS AND METHOD FOR TRANSMITTING, AND APPARATUS AND METHOD RECIVING IN COMMUNICATION SYSTEM}

The present invention relates to a transmission apparatus and method, and a reception apparatus and method of a communication system, and more particularly, to an apparatus and method for mapping and transmitting data of a transport channel to a physical channel, and an apparatus and method for receiving the same.

The present invention is derived from the research conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication [Task management number: 2005-S-404-13, task name: 3G Evolution wireless transmission technology development].

The transmitting apparatus of the communication system performs channel encoding on the upper layer data, rate-matches the data of the higher layer mapped to the transport channel, and transmits the rate mapped data stream to one or more physical channels. Split into channels Thereafter, after performing data interleaving in the corresponding physical channel, the data stream divided into each physical channel is mapped to each physical channel and transmitted to the receiving apparatus through the wireless channel. A receiving apparatus of a communication system collects data by demapping data received through a wireless channel for each physical channel, performs data interleaving for each physical channel, performs derate mapping, and transmits the channel to a higher layer after decoding.

In particular, in a mobile communication system such as 3GPP WCDMA, when a physical channel is mapped to two or more physical channels after interleaving data transmitted from a higher layer as described in "3GPP TS25.212, Multiplexing and channel coding", Since it is composed of two or more symbols of time units, it is mapped to the symbol of the time domain of the first physical channel, and then to the symbol of the time domain of the second physical channel, and the other physical channels are mapped in the same manner.

However, in the Orthogonal Frequency Division Multiple (OFDM) transmission system and the Single Carrier-Frequency Division Multiple Access (SC-FDMA) transmission system, a physical channel is composed of a combination of symbols in a plurality of time domains and subcarriers in a plurality of frequency domains. have. That is, one physical channel has a plurality of time domain symbols, and one time domain symbol is composed of a plurality of subcarriers. In such a communication system, one physical channel is divided into a bundle of subcarriers in a frequency domain, and a time-domain symbol for the bundle of each frequency domain is configured as one physical channel. In this case, when data interleaving and physical channel mapping are performed as in the WCDMA communication system, the number of clocks about twice the number of data bits transmitted from the upper layer is required, and as the size of data increases, a time delay due to data interleaving becomes longer. Have. In addition, when having more than one physical channel, the time delay due to data interleaving can be reduced, but it causes a long time delay in transmitting data to each physical channel. In addition, a long time delay is required for the receiving device to collect data on the physical channel and deinterleave the collected data.

An object of the present invention is to provide a transmission apparatus and method capable of reducing time delay due to data interleaving and physical channel mapping in a communication system. Another object of the present invention is to provide a receiving apparatus and method capable of reducing time delay caused by data collection and deinterleaving of collected data.

According to an embodiment of the present invention, a method for transmitting data of a higher layer in a communication system is provided. The transmission method includes dividing the data into a plurality of data blocks, interleaving the divided data blocks, and mapping and transmitting the interleaved data blocks to at least one physical channel. .

According to another embodiment of the present invention, an apparatus for transmitting data of a higher layer in a communication system is provided. The transmitting apparatus includes a data interleaver for dividing the data into a plurality of data blocks, interleaving the divided data blocks, and a channel mapping unit for mapping and transmitting the interleaved data blocks to physical channels. In this case, the physical channel may be a combination of a plurality of time domain symbols and a plurality of frequency carrier subcarriers.

According to another embodiment of the present invention, a method for receiving data in a communication system is provided. The receiving method includes demapping received data in at least one physical channel, dividing the received data into a plurality of data blocks, and deinterleaving the plurality of data blocks, respectively.

According to another embodiment of the present invention, an apparatus for receiving data in a communication system is provided. The receiving apparatus includes a channel demapping unit for demapping received data in a physical channel, and a data deinterleaver for dividing the demapped data into a plurality of data blocks and deinterleaving the plurality of data blocks, respectively. In this case, the at least one physical channel may be a combination of symbols of a plurality of time domains and subcarriers of a plurality of frequency domains.

According to an embodiment of the present invention, a time delay caused by data interleaving and physical channel mapping may be reduced in a transmitting apparatus, and a time delay caused by data collection and data deinterleaving according to physical channel demapping at a receiving apparatus may be reduced. have.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise. In addition, the terms "... unit", "... group", "module", etc. described in the specification mean a unit for processing at least one function or operation, which is hardware or software or a combination of hardware and software. It can be implemented as.

Now, a transmitter and method and a receiver and method of a communication system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view schematically showing a communication system according to an embodiment of the present invention.

As shown in FIG. 1, a communication system according to an exemplary embodiment of the present invention includes a transmitter 100 and a receiver 200. The transmitter 100 transmits a data bit stream transmitted from an upper layer to a physical layer through a plurality of transport channels, and maps data of the plurality of transport channels to at least one physical channel in a physical layer through a wireless channel. Send to the receiver 200. In an embodiment of the present invention, a physical channel is composed of a combination of symbols of a plurality of time domains and subcarriers of a plurality of frequency domains. Such communication systems include an OFDM transmission system and an SC-FDMA transmission system.

The receiver 200 receives data through a wireless channel, collects data for each physical channel in the physical layer, and delivers the data to a higher layer.

Next, the transmitter 100 and the method for transmitting the data bit stream in the transmitter 100 according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

2 is a schematic block diagram of a transmitter 100 according to an embodiment of the present invention, and FIG. 3 is a flowchart illustrating a process of transmitting a data bit stream in the transmitter 100 according to an embodiment of the present invention.

As shown in FIG. 2, the transmitter 100 according to an exemplary embodiment of the present invention includes an additional bit adder 110, a channel encoder 120, a rate matcher 130, a data interleaver 140, and channel mapping. The unit 150 is included.

The additional bit adding unit 110 adds additional bits to the data bit stream transmitted from the upper layer (S310). Such additional bits may include a Cyclic Redundancy Code (CRC). In this case, the CRC is used to detect an error for a transport channel, and is obtained by each generation polynomial with 24, 16, 12, and 8 bits, and assigned according to each transport channel.

The channel encoder 120 performs channel encoding on the data bit stream to which the additional bits are added (S320). In this case, as the channel coding method, convolutional coding, trellis coding, turbo coding, low density parity check (LDPC) coding, or concatenated coding in which two or more of these are interconnected may be used.

The rate matching unit 130 adjusts the size of the channel coded data bit stream by rate matching the channel coded data bit stream (S330). That is, the rate matching unit 130 adjusts the number of bits of the encoded data bit stream by repeating or puncturing predetermined data in the channel coded data bit stream according to the rate matching pattern.

The data interleaver 140 interleaves the rate matched data bit stream. That is, the data interleaver 140 rearranges the input order of the rate-matched data bit stream in order to take the frequency diversity gain in the frequency domain and the time diversity gain in the time domain in the transport channel.

The data interleaver 140 according to the embodiment of the present invention includes a data divider 142, a block interleaver 144 ₁ to 144 _n , and a data concatenator 146.

The data divider 142 divides the data block into a plurality of data blocks when the size of the rate-matched data bit stream is larger than the block sizes of the block interleavers 144 ₁ to 144 _n (S340). Here, the block size of the block interleaver 144 ₁ to 144 _n may be determined according to the number of bits included in one OFDM symbol in the OFDM transmission system.

The block interleaver 144 ₁ to 144 _n interleaves each of the plurality of divided data blocks (S350). At this time, the number of block interleaver 144 ₁ to 144 _n corresponds to the number of data blocks divided by the data divider 142. A block interleaver (144 ₁ ~ 144 _n) in each case is less than the block size of the data block a block interleaver (144 ₁ ~ 144 _n), the size is set in the data, may be interleaved after the insertion of the arbitrary data delta bit, any It may be interleaved after repeating the data of. After interleaving, any data delta bits and any repeated data are removed.

The block interleaver 144 ₁ to 144 _n according to an embodiment of the present invention reads data of a data block from one block interleaver 144 ₁ and sequentially writes the data block to another block interleaver 144 ₂ . Read data of In this way, the block interleaver 144 ₁ to 144 _n performs interleaving on each data block, thereby reducing time delay due to interleaving.

The data concatenator 146 concatenates data interleaved by the block interleaver 144 ₁ to 144 _n (S360).

The channel mapping unit 150 generates modulation symbols by mapping the concatenated data to at least one physical channel, and transmits the generated modulation symbols to the receiver 200 (see FIG. 1) through the wireless channel (S370).

Next, a method of mapping a data bit stream to a physical channel in the transmitter 100 according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.

4 is a diagram illustrating a physical channel mapping method according to a first embodiment of the present invention, and FIG. 5 is a diagram illustrating a physical channel mapping method according to a second embodiment of the present invention.

As shown in FIG. 4, the channel mapping unit 150, for each bit of the interleaved data bit stream, starts with a symbol in a time domain to which a physical channel is allocated and then performs a symbol for a symbol in a first time domain t ₀ . A modulation symbol is generated by mapping from the first subcarrier to the last subcarriers f ₀ to f _F-1 and transmitted to the receiver 200 through a wireless channel. After that, mapping is performed from the first subcarrier to the last subcarrier (f ₀ to f _F-1 ) for the symbol in the next time domain (t ₁ ) to generate a modulation symbol and transmit the modulation symbol to the receiver 200 through a wireless channel. . In the same manner, modulation symbols are generated by mapping symbols from the last time domain t ₂ to f _T-1 allocated to the physical channel thereafter, and then transmitted to the receiver 200 through the wireless channel.

Meanwhile, unlike FIG. 4, when there are a plurality of physical channels, as illustrated in FIG. 5, the channel mapping unit 150 physically stores data to be mapped to the first physical channel Ph ₀ among the interleaved data bit streams. Starting with the symbols in the time domain assigned to the channel, the modulation symbols are generated by mapping from the first subcarrier for the symbols in the first time domain (t ₀ ) to the last subcarriers (f ₀ to f _F-1 ) and over the wireless channel. Send to the receiver 200. Thereafter, a modulation symbol is generated by mapping the first subcarrier for the symbol of the next time domain t ₁ to the last subcarrier f ₀ to f _F-1 and transmitted to the receiver 200 through a wireless channel. The channel mapping unit 150 generates a modulation symbol by mapping the symbols from the last time domain (t ₂ to t _T-1 ) allocated to the physical channel thereafter to the receiving unit 200 through the physical channel. send. In this way, when symbol mapping for the first physical channel Ph ₀ is completed, data to be mapped to the second physical channel Ph ₁ of the interleaved data bit stream is mapped to the second physical channel Ph ₁ and modulated. A symbol is generated and transmitted to the receiver 200 through a wireless channel. The second physical channel (Ph ₁ ) is allocated from the subcarrier (f _F ) after the last subcarrier assigned to the first physical channel (Ph ₀ ), and in the same way, from the first time domain to the last time domain (t ₀ to t _T-1 ) generates modulation symbols by mapping the first subcarrier to the last subcarrier f _F to f _2F-1 and transmits them to the receiver 200 through a wireless channel. In this way, mapping is performed to the last subcarrier (f _PF-1 ) for the last time domain (t _T-1 ) allocated to the entire physical channel (Ph _p-1 ) to generate a modulation symbol to receive the receiver through the wireless channel. Send to 200.

By mapping the data bit stream to the physical channel in this way, the time delay caused by the physical channel mapping can also be reduced.

Next, the receiver 200 and the method for receiving data in the receiver 200 according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 6 and 7.

6 is a schematic block diagram of a receiver 200 according to an embodiment of the present invention, and FIG. 7 is a flowchart illustrating a process of receiving data in the receiver 200 according to an embodiment of the present invention.

As shown in FIG. 6, the receiver 200 according to an exemplary embodiment of the present invention may include a channel demapping unit 210, a data deinterleaver 220, a derate matching unit 230, a channel decoding unit 240, and An error check unit 250 is included.

The channel demapping unit 210 demaps data received through a wireless channel in a physical channel to collect data on the physical channel.

The data deinterleaver 220 deinterleaves the collected data. The data deinterleaver 220 according to the embodiment of the present invention includes a data divider 222, a block deinterleaver 224 ₁ to 224 _n , and a data concatenator 226.

When the size of the collected data is larger than the block size of the block deinterleaver 224 ₁ to 224 _n , the data divider 222 may divide the collected data according to the block size of the block deinterleaver 224 ₁ to 224 _n . Split into data blocks. In this case, the block size of the block deinterleaver 224 ₁ ~ 224 _n may also be determined according to the number of bits included in one OFDM symbol in the OFDM transmission system.

The block deinterleaver 224 ₁ to 224 _n deinterleaves a plurality of data blocks. In the block deinterleaver 224 ₁ to 224 _n according to an exemplary embodiment of the present invention, the block deinterleaver 224 ₁ to 224 _{n is} arranged in a predetermined order in a manner similar to that of the block interleaver 144 ₁ to 144 _n of the transmitter 100. For example, deinterleaving is performed in order, and some of the time intervals between the two block interleavers among the block deinterleavers 224 ₁ to 224 _n overlap each other. Therefore, it is possible to reduce the time delay due to deinterleaving.

The data concatenator 226 concatenates a plurality of deinterleaved data blocks.

The derate matching unit 230 derates the concatenated data to restore the number of bits adjusted by the rate matching to its original state.

The channel decoder 240 decodes the derate matched data. In this case, the channel decoding method follows the channel encoding method used in the channel encoder 120 (FIG. 2).

The error checker 250 performs an error check on the channel-decoded data to determine whether the transport channel is in error and transmits the error to the upper layer.

Next, a method of demapping received data in a physical channel in the receiver 200 according to an exemplary embodiment of the present invention will be described in detail.

As shown in FIG. 4, when the transmitter 100 maps data to one physical channel and transmits the data, the channel demapping unit 210 is assigned to a symbol in a time domain (t ₀ of FIG. 4) assigned to the physical channel. Demapping the received data from the first subcarrier to the last subcarrier (f ₀ to f _F-1 ) to collect data of the physical channel, and then from the first subcarrier of the symbol of the next time domain (t ₁ of FIG. 4) to the last subcarrier ( f ₀ ~ f _F-1 ) to demap the received data to collect data of the physical channel. In the same manner, the channel demapping unit 210 receives the received data up to the last subcarriers f ₀ to f _F-1 of the symbol of the last time domain (t ₂ to t _{T-1 in} FIG. 4) allocated to the physical channel. Demap to collect data on the physical channel.

In addition, as illustrated in FIG. 5, when the transmitter 100 maps and transmits data to a plurality of physical channels Ph ₀ to Ph _P-1 , the channel demapping unit 210 performs the first physical channel (FIG. Starting from the symbol in the time domain assigned to Ph ₀ ) in FIG. 5, the received data is received from the first subcarrier to the last subcarrier in symbols in the first time domain (t _{0 in} FIG. 5) (f ₀ to f _{F-1 in} FIG. 5). Demap at to collect the data of the physical channel (Ph _{0 in} FIG. 5). Thereafter, data of the physical channel Ph ₀ is collected from the first subcarrier to the last subcarrier f ₀ to f _F-1 for the symbol of the next time domain (t ₁ of FIG. 5). The physical channel demapping unit 210 demaps the received data up to the symbol of the last time region t ₂ to t _T-1 allocated to the physical channel Ph ₀ in the same manner to demap the received data of the physical channel Ph ₀ . Collect data. In this way, when data of the first physical channel Ph ₀ is collected, the channel demapping unit 210 collects data of the second physical channel Ph ₁ . Two data for the second physical channel (Ph _1), the first physical channel and the last sub-carrier (f _F-1) it is assigned, and then from the sub-carrier (f _F), the first physical channel (Ph ₀₎ is assigned to (Ph ₀₎ In the same way as to collect the data collected from the first subcarrier (f _F ~ f _2F-1 ) for the first time to the last time region (t ₀ ~ t _T-1 ). In this manner, data is collected up to the last subcarrier f _PF-1 for the last time domain t _T-1 allocated to the entire physical channel Ph _p-1 .

In this way, the time delay for collecting data on the physical channel may be reduced than when configuring a symbol in the time domain for a bundle of subcarriers in the frequency domain into one physical channel.

An embodiment of the present invention is not implemented only through the above-described apparatus and / or method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded, and the like. Such implementations can be easily implemented by those skilled in the art to which the present disclosure pertains based on the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a view schematically showing a communication system according to an embodiment of the present invention,

2 is a schematic block diagram of a transmitter according to an embodiment of the present invention;

3 is a flowchart illustrating a process of transmitting a data bit stream in a transmitter according to an exemplary embodiment of the present invention.

4 is a diagram illustrating a physical channel mapping method according to a first embodiment of the present invention;

5 is a diagram illustrating a physical channel mapping method according to a second embodiment of the present invention;

6 is a schematic block diagram of a receiver according to an embodiment of the present invention;

7 is a flowchart illustrating a process of receiving data in a receiver according to an exemplary embodiment of the present invention.

Claims (21)

In a method for transmitting data of a higher layer in a communication system, Dividing the data into a plurality of data blocks; Interleaving each of the divided data blocks, and Mapping and transmitting the interleaved data blocks to at least one physical channel Including, The interleaving step, Interleaving one data block of the plurality of data blocks, and Interleaving other data blocks of the plurality of data blocks; And a time in which the interleaving time of the one data block overlaps with a time of interleaving the other data block. The method of claim 1, And the physical channel is a combination of a plurality of time domain symbols and a plurality of frequency domain subcarriers. delete The method of claim 1, Prior to the transmitting step, Concatenating the plurality of interleaved data blocks Transmission method further comprising. The method of claim 1, The transmitting step, Generating and transmitting a modulation symbol sequentially from a symbol of a first time domain to a symbol of a last time domain in symbols of the plurality of time domains, Generating and transmitting a modulation symbol for a symbol in an nth time domain may include: Generating a modulation symbol by mapping the plurality of interleaved data blocks from a first subcarrier to a last subcarrier for a symbol of an nth time domain; and Transmitting the generated modulation symbol. The method according to claim 1 or 5, The subcarriers of the plurality of frequency domains are grouped into a plurality of groups, and the at least one physical channel is a plurality of physical channels respectively corresponding to the plurality of groups, The transmitting step, Mapping a portion of the interleaved data block to one physical channel of the plurality of physical channels, and Mapping the remainder of the interleaved data block to another one of the plurality of physical channels. The method of claim 6, The interleaving step, And inserting predetermined data bits in the corresponding data block or repeating predetermined data bits in the corresponding data block according to the length of each data block. The method of claim 6, Prior to the dividing step, Adding additional bits to the data, Encoding the data to which the additional bits are added, and Rate matching the encoded data Transmission method further comprising. An apparatus for transmitting data of a higher layer in a communication system, A data interleaver for dividing the data into a plurality of data blocks, and interleaving the divided data blocks, respectively; A channel mapping unit for mapping the interleaved data blocks to a physical channel including a combination of a plurality of time domain symbols and a plurality of frequency carrier subcarriers Including; The data interleaver, A data divider for dividing the data into the plurality of data blocks; A plurality of block interleavers for interleaving the plurality of data blocks, respectively; A data concatenator for concatenating the plurality of interleaved data blocks, And a time period during which the first block interleaver interleaves among the plurality of block interleavers overlaps with a time period when the second block interleaver interleaves among the plurality of block interleavers. delete The method of claim 9, And the channel mapping unit maps the plurality of interleaved data blocks from the first subcarrier to the last subcarrier in the corresponding time domain in each of the symbols of the plurality of time domains. In a method for receiving data in a communication system, Demapping received data on at least one physical channel, Dividing the received data into a plurality of data blocks, and Deinterleaving the plurality of data blocks, respectively Including, The deinterleaving step may include: Deinterleaving one data block of the plurality of data blocks, and Deinterleaving another data block among the plurality of data blocks; And the time for deinterleaving the one data block overlaps with the time for deinterleaving the other data block. The method of claim 12, The at least one physical channel is a combination of a plurality of time domain symbols and a plurality of frequency carrier subcarriers. delete The method of claim 12, Concatenating the plurality of deinterleaved data blocks Receiving method further comprising. The method of claim 15, Derate matching the plurality of concatenated data blocks; Decoding the plurality of derate mapped data blocks, and Checking an error for the plurality of decoded data blocks Receiving method further comprising. The method of claim 12, Demapping step, Demapping the received data in sequence from a symbol in a first time domain to a symbol in a last time domain in symbols of the plurality of time domains, Demapping the received data with respect to a symbol of an nth time domain, And demapping the received data from the first subcarrier to the last subcarrier for the symbol of the nth time domain. The method according to claim 12 or 17, wherein The subcarriers of the plurality of frequency domains are grouped into a plurality of groups, and the at least one physical channel is a plurality of physical channels respectively corresponding to the plurality of groups, Demapping step, Demapping a portion of the received data in one physical channel of the plurality of physical channels, and Demapping the remainder of the received data in another physical channel of the plurality of physical channels. An apparatus for receiving data in a communication system, A channel demapping unit for demapping received data in a physical channel including a combination of a plurality of time-domain symbols and a plurality of frequency domain subcarriers, and A data deinterleaver for dividing the de-mapped data into a plurality of data blocks and deinterleaving the plurality of data blocks, respectively Including; The data deinterleaver, A data divider dividing the de-mapped data into the plurality of data blocks; A plurality of block deinterleavers for deinterleaving the plurality of data blocks, respectively; A data concatenator for concatenating the plurality of deinterleaved data blocks, And a time period during which the first block deinterleaver deinterleaves among the plurality of block deinterleavers overlaps with a time period during which the second block deinterleaver deinterleaves among the plurality of block deinterleavers. delete The method of claim 19, And the channel demapping unit demaps the received data from the first subcarrier to the last subcarrier in the corresponding time domain in each of the plurality of time domain symbols.

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