CN101682406A - Method for mapping physical downlink control channel to resources and apparatus for transmitting/receiving the mapped physical downlink control channel in a wireless communication system - Google Patents

Abstract

Provided are a method for mapping a physical downlink control channel (PDCCH) to a resource in a wireless communication system, and an apparatus for transmitting/receiving the mapped PDCCH, wherein if at least one PDCCH is scheduled in a subframe according to a predetermined scheduling scheme transmitted, the PDCCH is concatenated, interleaved and mapped to at least one resource element (RE).

Description

Method for mapping physical downlink control channel to resources in wireless communication system and device for transmitting and receiving the mapped physical downlink control channel

technical field

The present invention generally relates to methods and apparatus for efficiently using control channels in wireless communication systems to achieve maximum interference diversity. More particularly, the present invention relates to a method and apparatus for efficiently mapping a Physical Downlink Control Channel (PDCCH) to time-frequency resources in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system.

Background technique

Recently, Orthogonal Frequency Division Multiplexing (OFDM) is being actively studied as a promising means for high-speed data transmission on wired/wireless channels in mobile communication systems. OFDM is a special case of Multi-Carrier Modulation (MCM), where an input sequence of serial symbols is converted to a sequence of parallel symbols and modulated onto orthogonal subcarriers, ie, subcarrier channels. OFDMA is a multi-user version of OFDM, where multiple users are distinguished by subcarriers, ie different subcarriers are assigned to different users.

FIG. 7 illustrates a method of transmitting data to multiple users in a conventional OFDMA system.

Referring to FIG. 7, the horizontal axis represents time, and the vertical axis represents frequency. Reference numeral 701 denotes a time-domain resource allocation unit, usually including a plurality of OFDM symbols. This resource allocation time unit is called a subframe. When the total system frequency band is divided into N frequency bands, reference numerals 702, 703, and 704 denote first, N-1th, and Nth frequency bands. Each frequency band typically includes multiple subcarriers. As shown in FIG. 7 , typically, time and frequency resources are used in an OFDM system to form multiple resource blocks, and resources are allocated to multiple users in the form of resource blocks. A single resource block is equivalent to a resource defined by one subframe and one frequency band in FIG. 7 . For example, if one frequency band includes 12 subcarriers and one subframe consists of 14 OFDM symbols, one resource block has 168 (12×14) time and frequency resources. The minimum time and frequency resource unit, ie, one subcarrier in one OFDM symbol, is called a resource element (RE).

As described above, in the OFDM system, the Node B allocates resources to at least one user equipment (UE) in units of resource blocks in each subframe and notifies the UE of the resource allocation result through resource allocation information in each subframe. The channel carrying resource allocation information is the shared control channel or PDCCH. Hereinafter, the PDCCH is referred to as a control channel. Generally, the control channel may include other information besides the resource allocation information, which will not be described in detail here. The information delivered by the control channel including resource allocation information is called control information. A single control channel carries resource allocation information for a single UE. Thus, when resources are allocated to multiple UEs simultaneously in a subframe, multiple control channels are transmitted to the UEs.

Generally, after channel coding and interleaving, the control channels generated by the Node B for multiple users are mapped to REs according to Time Division Multiplexing/Frequency Division Multiplexing (TDM/FDM) before transmission to the users. The control channels are mapped in the same way for each Node B and each subframe. Resource mapping means mapping control channels to physical REs. For example, if five control channels are transmitted in a subframe, the five control channels are mapped to REs in the same manner in each Node B. Therefore, the lack of random effects may lead to performance degradation when interference occurs between control channels from different Node Bs. In other words, any control channel is sensitive to some statistically strong interference, with consequent performance degradation.

Contents of the invention

An aspect of exemplary embodiments of the present invention is to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present invention provides a method for mapping a Physical Downlink Control Channel (PDCCH) to resources in order to reduce interference of a PDCCH from a Node B from PDCCHs from other Node Bs in a wireless communication system.

Another aspect of the present invention is to provide an apparatus for transmitting a PDCCH that has been mapped in a predetermined method in order to reduce interference of a PDCCH from a Node B from PDCCHs from other Node Bs in a wireless communication system.

Another aspect of the present invention is to provide an apparatus for receiving a PDCCH that has been mapped in a predetermined method in order to reduce interference of a PDCCH from a Node B from PDCCHs from other Node Bs in a wireless communication system.

According to an aspect of the present invention, there is provided a method for mapping multiple PDCCHs to resources in a wireless communication system, wherein if at least one PDCCH is scheduled to be transmitted in a subframe according to a predetermined scheduling scheme, the PDCCHs are concatenated, interleaved and maps to at least one RE.

According to another aspect of the present invention, a method for mapping multiple PDCCHs to resources in a wireless communication system is provided, wherein if at least one PDCCH is scheduled to be transmitted in a subframe according to a predetermined scheduling scheme, each PDCCH At least one CE is allocated and connected, interleaved and mapped to at least one RE.

According to another aspect of the present invention, a method for mapping multiple PDCCHs to resources in a wireless communication system is provided, wherein if at least one PDCCH is scheduled to be sent in a subframe according to a predetermined scheduling scheme, at least one control element (CEs) are allocated to each PDCCH and concatenated, each concatenated CE is modulated to at least one modulation symbol, and the modulation symbols are interleaved and mapped to REs.

According to still another aspect of the present invention, there is provided an apparatus for mapping multiple PDCCHs to resources and transmitting the mapped PDCCHs in a wireless communication system, wherein the connector is used to, if at least one PDCCH is scheduled according to a predetermined scheduling scheme in sub frame, then allocate at least one control channel element (CE) to each PDCCH and concatenate the allocated CEs; an interleaver interleaves the concatenated CEs; and a CE-to-RE mapper maps the interleaved CEs to REs.

According to still another aspect of the present invention, there is provided an apparatus for mapping multiple PDCCHs to resources and transmitting the mapped PDCCHs in a wireless communication system, wherein the connector is used to, if at least one PDCCH is scheduled according to a predetermined scheduling scheme in sub frame, assign at least one CE to each PDCCH and connect the assigned CEs; the modulator modulates each of the connected CEs into at least one modulation symbol; the interleaver interleaves the modulation symbols; and the CE-to-RE mapper The interleaved modulation symbols are mapped to REs.

According to another aspect of the present invention, there is provided a device for receiving a PDCCH mapped to a resource in a wireless communication system, wherein an analog-to-digital converter converts a signal received through an antenna into a digital signal; Fast Fourier Transform (FFT ) The processor converts the digital signal to a frequency signal; the pilot tone extractor extracts the pilot frequency from the resource element (RE) to which the control channel element (CE) is mapped in the subcarrier of the frequency signal; the channel estimator uses the pilot frequency tone to perform channel Estimation; RE to CE demapper demaps CEs from REs; deinterleaver deinterleaves demapped CEs; demodulator demodulates deinterleaved CEs using channel estimation information received from channel estimator; divider separating the demodulated CE into multiple pieces of PDCCH information; and multiple channel decoders for decoding the multiple pieces of PDSCH information.

Description of drawings

The above and other aspects, features and advantages of specific exemplary embodiments of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings, in which:

Figure 1 illustrates the operation of mapping PDCCHs to REs according to the present invention.

Figure 2 illustrates the operation of mapping control channel elements (CEs) of a PDCCH to REs according to the present invention.

Fig. 3 is a block diagram of a PDCCH transmitting device according to the present invention.

FIG. 4 is a flowchart illustrating a PDCCH transmission method according to the present invention.

FIG. 5 is a block diagram of a PDCCH receiving device according to the present invention.

FIG. 6 is a flowchart illustrating a PDCCH receiving method according to the present invention.

FIG. 7 illustrates a method of transmitting data to multiple users in a conventional OFDMA system.

Throughout the drawings, it will be understood that like drawing reference numbers represent like elements, features and structures.

Detailed ways

The subject matter defined by the description, such as the detailed structure and elements, is provided to assist a thorough understanding of the exemplary embodiments of the present invention. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions will be omitted for clarity and conciseness.

In order to implement the method for mapping control channels to resources according to the present invention, a resource allocation unit for control channel transmission, a control channel element (CE), is defined. The difference between a CE and a resource block is that a CE is a resource allocation unit for transmission of a control channel, while a resource block is a resource allocation unit for data transmission. When at least one control channel is scheduled to be transmitted in a subframe according to a predetermined scheduling scheme, one or more CEs are assigned to each control channel. At least one CE is connected, and the symbols in the CE are interleaved by an interleaving method specific to each Node B. The interleaved symbols are then mapped to REs. CE to RE mapping can also be performed in a scheme specific to each Node B.

Figure 1 illustrates the operation of mapping PDCCHs to REs according to the present invention. In the scenario illustrated in Figure 1, six control channels, Control Channel 1, Control Channel 2, ... Control Channel 6, are sent to six UEs in a subframe. Each of the six control channels includes resource allocation information for one of the six UEs. In step 110, resource allocation information about each UE is channel-coded according to a predetermined coding scheme such as convolutional coding. Then at least one CE is assigned to each control channel. As mentioned above, a CE is defined as a resource allocation unit used for control channel transmission, including multiple logical REs. Since mapping between CEs and physical REs can be implemented in various ways, REs are called logical REs. For example, when one CE includes 36 logical REs, it means that 36 modulation symbols can be transmitted in one CE. Reference numerals 121 to 126 denote that at least one CE is allocated to each of the control channels. In the case illustrated in FIG. 1, one CE, two CEs, three CEs, two CEs, one CE and one CE are assigned to the control channels 1 to 6, respectively. The reason for allocating different numbers of CEs to different control channels is that the UEs are placed in different channel states (different received signal-to-noise ratios (SNRs)). For example, UEs receiving control channels 1, 5, and 6 (121, 125, and 126) are in a good channel state, and control information can be sent to each UE in one CE (ie, 36 modulation symbols). On the contrary, the UE receiving the control channel 3 (123) is in a poor channel environment, so the control information is transmitted to the UE in three CEs (ie, 108 modulation symbols). Although a total of 10 CEs are used to transmit control channels in FIG. 1, the total number of CEs in each subframe is variable. In step 120, all CEs including control channels are connected. In step 130, the symbols in the connected CEs are interleaved, ie, the order of the connected CEs is permuted. Using a different interleaving scheme for each cell facilitates randomization of CE to RE mapping in each BS, thereby enabling randomization of interference from neighboring BSs during transmission of each control channel.

The interleaving of step 130 will be described in more detail. Each connected CE includes a number of logical elements (LEs) 127 whose CE indices are represented by equation (1),

其中j_CE＝0，...，N_CE i_LE＝0，...，N_LE

where j _CE =0, ..., N _CE i _LE =0, ..., N _LE

....(1)

The LEs of each CE can be interleaved in any way and are not limited to a specific scheme. Thus, interleaving LE by equation (2),

k _{int erlveadLE} = f _{int erleaving} (i _LE )

....(2)

Where f _{int erleaving} (·) represents an interleaving function.

A pruning bit reversed order (PBRO) permutation scheme can be used in order to randomly permute the order of the N _LE LEs such that adjacent LEs are far away from each other. PBRO has a different offset for each BS or each subframe. The PBRO offset of each subframe of each BS is expressed as Offset _{sector, subframe_index} . Then, after interleaving, the index of each LE is given by equation (3).

k _{int erlveadLE} = f _{int erleaving} ((i _LE +Offset _{sector, subframe_index} )mod N _LE )

=PBRO((i _LE +Offset _{sector, subframe_index} ) mod N _LE , N _LE )

....(3)

Therefore PBRO is defined as equation (4),

y = PBRO(i, N _LE )

....(4)

PBRO replacement values are generated in the following order.

Step 1. PBRO parameter, n is selected according to equation (5),

N _LE ≤2n....(5)

Step 2. i and j are set to initial value 0.

Step 3. x is defined as the bit-reversed value of j using n-bit binary format, e.g. if n is 4 and j is 3, then x is 12.

Step 4. If x≤N _LE , set PBRO(i, N _LE ) to x and increment i by 1.

Step 5. Otherwise, increment j by 1.

Step 6. If i<M, the procedure goes back to step 3.

When the i-th _LE is rearranged to be the k-th LE _{int erlveadLE} and the index of the rearranged LE is o _{int erlveadLE} , o _{int erlveadLE} is a sequential interleaving of one of 0,...,N _LE -1 The LE index.

In the above PBRO interleaving method, for N _LE =12 and Offset _{sector, subframe_index} = 2, k _{int erlveadLE} , (i _LE + _{Offset sector, subframe_index} ) mod N _LE , and o _{int erlveadLE} are given as follows.

Table 1

(i _LE +Offset _{sec tor，subframe_index} ) mod N _LE 2 3 4 5 6 7 8 9 10 11 0 1 k _{int erlveadLE} 4 2 10 6 1 9 5 3 11 7 0 8 o _{int erlveadLE} 0 1 2 3 4 5 6 7 8 9 10 11

As can be seen from Table 1, k _{int erlveadLE} is an index, which can be obtained by spreading N _LE LEs as much as possible.

While each BS interleaves differently by applying a BS-specific offset to PBRO interleaving, other methods can obviously be used.

At step 140, the interleaved modulation symbols of the control channel are mapped to REs allocated for transmission of the control channel. The mapping may be different in each BS or in each subframe or in each OFDM symbol, or in each OFDM symbol in each subframe of each BS. Referring to Figure 2, the mapping will be described in more detail.

Fig. 2 illustrates the operation of mapping CE to RE of a PDCCH according to the present invention. Mapping between CE or LE and RE will be described with reference to FIG. 2 . As mentioned before, a CE is a resource allocation unit for a control channel and a single PDCCH can have at least one CE. LE is an element of CE. When a CE is mapped to an RE, the LEs of the CE are mapped to the REs in a one-to-one correspondence. In other words, one CE maps to multiple REs. All interleaved LEs described in FIG. 1 are mapped to REs in FIG. 2 . REs are available subcarriers in the time-frequency domain other than pilot or subcarriers serving other purposes. In FIG. 2, reference numeral 210 denotes a pilot subcarrier for an antenna, and reference numeral 220 denotes an RE.

Although the CE-to-RE (LE-to-RE) mapping described in FIG. 2 is for a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, the described CE-to-RE mapping is only an exemplary application, and the present invention does not limited to a specific system. Therefore, the present invention is also applicable to other systems. In Fig. 2, a time slot is defined by 7 OFDM symbols, and two time slots form a subframe in the OFDM system. The time-frequency region includes pilot subcarriers transmitted through each antenna and REs to which LEs are to be mapped, as indicated by reference numeral 230 . As can be seen from reference numerals 240, 250 and 260, up to three OFDM symbols include REs to which LEs are to be mapped, and LEs can be mapped to the same or different REs in different OFDM symbols.

The LE-RE mapping pattern is specific to each OFDM symbol. Specifically, when all REs of the last OFDM symbol are not mapped, LEs are mapped to REs evenly spread over the total frequency band. For example, when the total number of interleaved LEs is N _LE and the index of the interleaved LEs is o _{int erlveadLE} , the number of REs available for LE-to-RE mapping in the first OFDM symbol is denoted as N _RE,0 . If N _RE,0 ≤ N _LE , then LEs with 0, ..., N _RE,0 -1 as o _{int erlveadLE} are mapped to REs of the first OFDM symbol in an arbitrary manner. In this way LE to RE mapping is performed in the second and third OFDM symbols. Indexes of LEs mapped to each OFDM symbol are calculated by Equation (6).

However, if N _RE,0 >N _LE , then LEs with 0,...,N _LE -1 as o _{int erlveadLEs} are mapped to the first OFDM symbol in an arbitrary distribution.

The indices of LEs mapped to REs in each OFDM symbol are given by:

o _{int erleavedLE, 0} = 0, ..., N _LE -1 if N _LE < N _{RE, 0} .....(1)

= 0, ..., N _{RE, 0} -1 otherwise .....(2)

o _{int erleavedLE, 1} = N _{RE, 0} , ..., N _LE -1 if N _{RE, 0} <= N _LE < N _{RE, 1} .....(3)

= N _{RE, 0} , ..., N _{RE, 1} -1 otherwise .....(4)

o _{int erleavedLE, 2} = N _{RE, 1} , ..., N _LE -1 if N _{RE, 1} <= N _LE < N _{RE, 2} .....(5)

= N _{RE, 1} , ..., N _{RE, 2} -1 else .....(6)

....(6)

LE to RE mapping can be done with arbitrary mapping rules. According to the invention, PBRO is used.

After calculating an index of LEs mapped to each OFDM symbol, LEs can be sequentially mapped to REs through Equation (7) in the situation described by Equation (6).

l _{mappedRE, j} = f _{LEtoREmapping} (o _{int erleavedLE, j} )

= o _{int erleavedLE, j}

....(7)

Meanwhile, LE-to-RE mapping can be performed in a PBRO scheme, which is used for interleaving according to Equation (8) below.

l _{mappedRE, j} = f _{LEtoREmapping} ((o _{int erleavedLE, j} + Offset _{sector, subframe_index, j} ) mod N _{RE, j} )

=PBRO((o _{int erleavedLE, j} + Offset _{sector, subframe_index, j} ) mod N _{RE, j} , N _{RE, j} )

....(8)

If N _LE =12 and N _{RE, 0} = N _{RE, 1} = N _{RE, 2} = 4, l _{mappedRE, j} (o _{int erleavedLE, j} + Offset _{sector, subframe_index, j} ) mod N _{RE, j} is given in Table 2 below It is shown about the cases of Offset _{sector, subframe_index, 0} = 1, Offset _{sector, subframe_index, 1} = 2, and Offset _{sector, subframe_index, 2} = 3.

Table 2

o _{int erleavedLE,j} 0 1 2 3 l _{mappedRE, 0} 2 1 3 0 l _{mappedRE, 1} 1 3 0 2 l _{mappedRE, 2} 3 0

Referring to Table 2, LEs are only mapped to RE 0 and RE 3 in the frequency domain in the last OFDM symbol. For this case, the PBRO scheme is used to scatter as many LEs as possible when OFDM symbols are not full of LEs.

Fig. 3 is a block diagram of a PDCCH transmitting device according to the present invention.

Referring to FIG. 3, channel encoders 301 to 308 channel-code the PDCCH and a connector 302 connects the channel-coded PDCCH in a predetermined method, which is not limited to a specific method of the present invention. The interleaver 303 interleaves the concatenated PDCCHs differently for each BS or each subframe. BS information, subframe information, and OFDM symbol information required for interleaving are pilot PN, subframe index, and OFDM symbol index received from the controller 304 . The modulator 305 modulates the interleaved signal, and the CE-to-RE mapper 306 under the control of the controller 304 maps CEs to REs differently for each BS, each subframe, and each OFDM symbol. The pilot tone inserter 307 inserts a pilot tone corresponding to each antenna into the CE-to-RE mapped signal, and shares the pilot-inserted CE-to-RE-mapped signal together with the physical downlink from the PDSCH transmitter 309 The channel (PDSCH) is provided to an Inverse Fast Fourier Transform (IFFT) processor 310 . The IFFT processor 310 multiplexes the received signal and converts the multiplexed signal into a time signal. A cyclic prefix (CP) adder 311 adds CP to a time signal. The transmitter 312 transmits the CP-added signal.

FIG. 4 is a flow chart illustrating a PDCCH transmission method (specifically, a CE-to-RE mapping operation of a transmission device) according to the present invention.

Referring to FIG. 4, in step 401, the BS configures a PDCCH for each MS through predetermined scheduling. The total number of PDCCHs depends on the scheduling result. In step 403, the BS configures the CE with the PDCCH. Here, the PDCCH includes at least one CE. In step 405, the BS connects to the CE in a predetermined method, which is not limited to a specific method. The BS interleaves symbols in the connected CEs differently for each BS or each subframe and maps the interleaved symbols to REs based on OFDM symbols at step 411 .

FIG. 5 is a block diagram of a PDCCH receiving device according to the present invention.

Referring to FIG. 5, a down-converter and analog-to-digital converter (ADC) 501 down-converts a radio frequency (RF) signal received through an antenna into a baseband signal and converts an analog signal into a digital signal. The CP remover 502 removes the CP in the digital signal. A Fast Fourier Transform (FFT) processor 503 converts the CP-removed time signal into a frequency signal. After demultiplexing, the subcarriers associated with the PDSCH are processed in the PDSCH receiver 513 as usual OFDM data reception operation. Meanwhile, the pilot tone extractor 505 extracts a pilot of each antenna from the demultiplexed REs to which the CE is mapped, and the channel estimator 507 performs channel estimation using the pilot tones. The RE-to-CE demapper 506 uses information derived from the pilot PN, subframe index, and OFDM symbol index received from the controller 514 to extract CEs from REs. The demodulator 508 demodulates the CE based on the channel estimation information received from the channel estimator 507 . The deinterleaver 509 deinterleaves the demodulated signal according to a pattern generated by the controller based on the pilot PN, the subframe index, and the OFDM symbol index. The divider 510 divides the deinterleaved CE into each piece of PDCCH information, and the channel decoders 511 to 512 decode the PDCCH information.

FIG. 6 is a flowchart illustrating a PDCCH receiving method according to the present invention.

Referring to FIG. 6 , in step 601 , CEs are demapped from REs in a BS-, subframe-, and OFDM symbol-specific manner and deinterleaved in a BS-specific and subframe-specific manner in step 603 . In step 605, the deinterleaved CEs are divided, and in step 607, the PDCCH is restored using the divided CEs. Since one PDCCH can be formed using multiple CEs, the number of CEs for each PDCCH should be known in advance in step 607 .

As evident from the above description, the present invention advantageously maximizes interference diversity between BSs and by interleaving downlink control channels in a BS-specific and subframe-specific manner and mapping BS-specific, subframe-specific, and OFDM symbol-specific CE to RE or mapping LE to RE to provide high efficiency system.

While the present invention has been shown and described with reference to specific exemplary embodiments thereof, it will be understood by those skilled in the art that changes may be made in form and detail without departing from the principles and spirit of the invention. Instead, the scope of the invention is defined by the claims and their equivalents.

Claims (15)

1. method that is used for a plurality of physical downlink control channels (PDCCH) are mapped to resource in wireless communication system comprises:

Send in subframe if dispatch at least one PDCCH, then connect the element among the PDCCH according to predetermined scheduling scheme;

Interweave through the element of connection; And

Element map through interweaving is arrived at least one resource element (RE).

2. the method for claim 1, the step that wherein interweaves be included as each base station or for each subframe by interweave element of different side-play amounts through connecting.

3. the method for claim 1, one of them PDCCH has a plurality of control channel elements (CCE).

4. the method for claim 1, wherein mapping step comprises sequentially the element map through interweaving to RE.

5. method that is used for a plurality of physical downlink control channels (PDCCH) are mapped to resource in wireless communication system comprises:

Send in subframe if dispatch at least one PDCCH, then distribute at least one control channel element (CE) to each PDCCH according to predetermined scheduling scheme;

Connect the CE that is distributed;

Code element among the CE through connecting interweaves; And

Symbol mapped through interweaving is arrived at least one resource element (RE).

6. method as claimed in claim 5, the step that wherein interweaves are included as each base station or are that each subframe interweaves through the CE of connection by different side-play amounts.

7. method as claimed in claim 5, if wherein all RE of OFDM code element are not used for mapping, then mapping step comprises sequentially the CE through interweaving is mapped to RE.

8. method that is used for a plurality of physical downlink control channels (PDCCH) are mapped to resource in wireless communication system comprises:

Send in subframe if dispatch at least one PDCCH, then distribute at least one control channel element (CE) to each PDCCH according to predetermined scheduling scheme;

Connect the CE that is distributed;

Among the CE that is connected each is modulated at least one modulated symbol;

Modulated symbol interweaves; And

Modulated symbol through interweaving is mapped to resource element (RE).

9. method as claimed in claim 8, the step that wherein interweaves be included as each base station or for each subframe by the different side-play amounts modulated symbol that interweaves.

10. method as claimed in claim 8, wherein mapping step comprises sequentially the element map through interweaving to RE.

11. one kind is used for a plurality of physical downlink control channels (PDCCH) are mapped to the device that resource concurrence send the PDCCH of mapping in wireless communication system, comprises:

Connector is used for, and sends in subframe if dispatch at least one PDCCH according to predetermined scheduling scheme, then distributes at least one control channel element (CE) to each PDCCH, and connects the CE that is distributed;

Interleaver, the code element of the CE that is used for interweaving through connecting; And

CE is used for the symbol mapped through interweaving to RE to resource element (RE) mapper.

12. device as claimed in claim 11, wherein interleaver is used to each base station or is that each subframe interweaves through the code element of connection by different side-play amounts.

13. one kind is used for a plurality of physical downlink control channels (PDCCH) are mapped to the device that resource concurrence send the PDCCH of mapping in wireless communication system, comprises:

Connector is used for, and sends in subframe if dispatch at least one PDCCH according to predetermined scheduling scheme, then distributes at least one control channel element (CE) to each PDCCH, and connects the CE that is distributed;

Modulator, each that is used for the CE that will be connected is modulated at least one modulated symbol;

Interleaver is used to the modulated symbol that interweaves; And

CE is used for the modulated symbol through interweaving is mapped to RE to resource element (RE) mapper.

14. device as claimed in claim 1, wherein interleaver be used to each base station or for each subframe by the different side-play amounts modulated symbol that interweaves.

15. a device that is used to receive the physical downlink control channel (PDCCH) that is mapped to resource in wireless communication system comprises:

Analog to digital converter, the conversion of signals that is used for receiving through antenna is a digital signal;

Fast Fourier transform (FFT) processor is used for digital signal is converted to frequency signal;

Pilot tone extractor is used for the resource element (RE) that control channel element (CE) is mapped in the middle of the subcarrier of frequency signal and extracts pilot tone;

Channel estimator is used to use pilot tones to carry out channel estimating;

RE is used for separating mapping CE from RE to the CE de-mapping device;

Deinterleaver is used for deinterleaving through separating the CE that mapping obtains;

Demodulator is used to use the channel estimating demodulates information that receives from the channel estimator CE through deinterleaving;

Divide device, be used for the CE through demodulation is separated into many PDCCH information; And

A plurality of channel decoders, described many PDSCH information are used to decode.

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