WO2015010269A1

WO2015010269A1 - Channel detection method, apparatus and terminal

Info

Publication number: WO2015010269A1
Application number: PCT/CN2013/079982
Authority: WO
Inventors: 余政; 程型清
Original assignee: 华为技术有限公司
Priority date: 2013-07-24
Filing date: 2013-07-24
Publication date: 2015-01-29
Also published as: CN104508991B; CN104508991A

Abstract

A channel detection method, apparatus and terminal. The method comprising: determining a target CRS (Common Reference Signal), which is adjacent to a resource element (RE) for the transmission of a physical control format indicator channel (PCFICH) and/or a physical hybrid-ARQ (Automatic Repeat Request) indicator channel (PHICH) and which is located on the RE bearing the common reference signal (CRS); performing channel estimation on the PCFICH and/or the PHICH according to the information of the target CRS, and performing channel detection on the PCFICH and/or the PHICH according to the result of channel estimation. By adopting the technical solution provided in the embodiment of the present invention, narrow-band channel estimation on the PCFICH and/or the PHICH is performed on the basis of finite CRS, which further enables demodulation detection of the PCFICH and/or the PHICH. Furthermore, by adopting the embodiment of the present invention, the feature of low cost in a low-end machine type communication (MTC) terminal can also be kept, and there is no need of developing the MTC terminal.

Description

Channel detection method, device and terminal

Technical field

The present invention relates to the field of communications technologies, and in particular, to a PCFICH channel or PHICH channel detection method, apparatus, and terminal in an LTE system. Background technique

The Internet of Things (IoT) refers to the acquisition of information in the physical world by deploying various devices with certain sensing, computing, execution and communication capabilities, and the realization of information transmission, coordination and processing through the network, thereby realizing the interconnection of people, objects and objects. The internet. In short, the Internet of Things is to achieve the interconnection of people and things, things and things (that is, M2M). In order to provide cost compared with GSM (Global System of Mobile communication) / GPRS (General Packet Radio Service) terminal cost, even lower than GSM / GPRS terminal cost LTE ( The Long Term Evolution (Long Term Evolution) terminal replaces the GSM/GPRS terminal used in the ,2Μ application, thereby replacing the GSM/GPRS network with the LTE network in the Μ2Μ application.

The maximum system bandwidth that the LTE system can support is 20 MHz. A normal LTE terminal can receive and transmit data on the entire carrier. For low-cost MTC (Machine Type Communication) terminals, as one of the technical means to reduce the cost, the receiving bandwidth of data, control and/or reference signals that the terminal can support is reduced, thereby enabling low-cost MTC. The processing power of the terminal can only handle data, control and/or reference signals, etc. within a small bandwidth (eg 1.4 MHz, 3 MHz or 5 MHz), thereby reducing its RF and/or baseband costs. For example, for the MTC terminal, in order to reduce the cost of the MTC terminal, the downlink data reception of the MTC terminal on a broadband carrier can only process data within a small bandwidth (ie, narrowband), and reduce the downlink of the MTC terminal. Data processing capabilities and data storage, resulting in MTC terminal cost savings. In the LTE system, the terminal needs to know the start time of the data transmission in the current subframe before receiving the data, where each subframe is composed of multiple OFDM (Orthogonal Frequency Division Multiplexing) symbols. On the first OFDM symbol of the subframe, the CFI (Control Format Indicator) value carried by the PCFICH (Physical Control Format Indicator Channel) channel is indicated in this sub- The number of OFDM symbols occupied by the intra control channel, and the data transmission is mapped from the last OFDM symbol occupied by the control. In addition, in the LTE system, after the terminal transmits data on the uplink PUSCH (Physical Uplink Shared Channel), the base station needs to feed back the response information to the terminal through the physical hybrid indication channel. If the base station successfully receives the uplink data sent by the terminal, the base station feeds back the ACK (ACKnowledge) to the terminal through the PHICH (Physical Hybrid Indicator Channel) channel, otherwise the base station feeds back NACK (Not ACKnowledge) to the terminal. In the prior art, when the terminal performs PCFICH channel or PHICH channel detection, since the time-frequency resources occupied by the PCFICH channel carrying the CFI value and the PHICH channel carrying the ACK/NACK response information are predetermined by the system, for the non-MTC For the terminal, the channel estimation may be performed based on the CRS (Common Reference Signal) on the entire carrier frequency band, and data demodulation and detection may be performed on the PCFICH channel or the PHICH channel determined by the system according to the result of the channel estimation. For MTC terminals, based on cost reduction considerations, MTC terminals cannot generally support broadband data processing.

Summary of the invention

The embodiments of the present invention provide a channel detection method, device, and terminal, which are used to solve the technical problem that a narrowband MTC terminal cannot detect a PCFICH channel and a PHICH channel in the prior art.

In a first aspect, an embodiment of the present invention provides a channel detection method, including: determining, adjacent to a resource element RE used for a physical control format indication channel PCFICH and/or a physical hybrid indication channel PHICH transmission, and carrying a common reference signal CRS The target CRS on the RE; the neighboring means: the number of intervals RE between the RE carrying the CRS and the RE used for PCFICH or PHICH transmission does not exceed a preset value, and based on the preset value The machine type communication terminal MTC UE stores the CRS buffer size smaller than the standard UE storage CRS buffer size:

Performing channel estimation of the PCFICH and/or PHICH channel according to the target CRS; performing the PCFICH and/or PHICH channel detection according to the result of the channel estimation.

In a first possible implementation manner of the first aspect, the information is based on the target CRS information Perform PCFICH channel estimation, including:

Determining whether there is an RE bearer CRS in the REs included in the four resource element groups REG used for the PCFICH channel transmission, and if yes, using the CRS carried in the REs included in the four REGs as the target CRS, and according to the The target CRS performs PCFICH channel estimation.

In a second possible implementation manner of the first aspect, the information is performed according to the target CRS information.

PHICH channel estimation, including:

Determining whether there is an RE bearer CRS in the REs included in the three resource element groups REG used for the PHICH channel transmission, and if yes, using the CRS carried in the REs included in the three REGs as the target CRS, and according to the The target CRS performs PHICH channel estimation.

In a third possible implementation manner of the first aspect, the target CRS includes: a CRS on another subcarrier within the same orthogonal frequency division multiplexing OFDM symbol as the RE used for the PCFICH and/or the PHICH transmission, and / or CRS within the OFDM symbol adjacent to the RE used for PCFICH and/or PHICH transmission.

In a fourth possible implementation manner of the first aspect, the time domain resource location of the target CRS, the frequency domain resource location, and the number of REs corresponding to the target CRS are predetermined.

In a fifth possible implementation manner of the first aspect, the time domain resource location, the frequency domain resource location, and the number of REs corresponding to the target CRS of the target CRS are specifically determined according to PHICH and/or PCFICH channel detection requirements and/or The baseband signal processing capability is predetermined.

In a second aspect, the embodiment of the present invention further provides a channel detecting apparatus, including: a determining module, configured to determine an RE that is adjacent to a resource element RE used for PCFICH and/or PHICH transmission and carries a common reference signal CRS Targeted CRS; the neighboring means: the number of intervals RE between the RE carrying the CRS and the RE used for PCFICH or PHICH transmission does not exceed a preset value, and the machine is based on the preset value The buffer size of the type communication terminal MTC UE storing the CRS is smaller than the buffer size of the standard UE storage CRS;

a channel estimation module, configured to perform the PCFICH and/or PHICH according to the target CRS Channel estimation of the channel;

And a channel detecting module, configured to perform PCFICH and/or PHICH channel detection according to the result of the channel estimation.

In a first possible implementation manner of the second aspect, the channel estimation module includes: a first determining submodule, configured to determine whether an RE of the four resource element groups REG used for the PCFICH channel transmission has an RE bearer CRS;

a first estimation submodule, configured to use, according to the CRS carried in the REs included in the four REGs, a target CRS according to the result of the first determining submodule, and according to the target CRS PCFICH channel estimation.

In a second possible implementation manner of the second aspect, the channel estimation module includes: a second determining submodule, configured to determine whether the RE included in the three resource element groups REG used for the PHICH channel transmission has an RE bearer CRS;

a second estimation submodule, configured to: when a result of the second determining submodule is YES, use a CRS carried in an RE included in the three REGs as a target CRS, and perform PHICH according to the target CRS. Channel estimation.

The third aspect, the embodiment of the present invention further provides an MTC terminal, including: the device according to any one of the preceding items. In a fourth aspect, an embodiment of the present invention further provides an MTC terminal, including at least one processor, at least one network interface or other communication interface, a memory, and at least one communication bus, for implementing connection communication between the devices; ,

Storing program instructions for execution by the processor, wherein the program instructions include a determining module, a channel estimating module, and a channel detecting module; the determining module, configured to determine resources used for PCFICH and/or PHICH transmission a target CRS on the RE of the element RE that is adjacent to and carrying the common reference signal CRS; the neighbor is Means: the number of intervals RE between the RE carrying the CRS and the RE used for PCFICH or PHICH transmission does not exceed a preset value, and the machine type communication terminal MTC UE based on the preset value stores the CRS The buffer size is smaller than the buffer size of the standard UE storage CRS: the channel estimation module is configured to perform channel estimation of the PCFICH and/or the PHICH channel according to the target CRS; The result of the channel estimation is performed for PCFICH and/or PHICH channel detection. Advantages of the present invention include: In the embodiment of the present invention, since the terminal only needs to perform channel estimation based on the CRS in the REG and/or the CRS adjacent to the REG, even if the MTC terminal only needs to store a limited CRS value, it is The narrowband PCFICH channel and/or PHICH channel estimation is performed based on the limited CRS, thereby implementing demodulation detection of the PCFICH and/or PHICH channel. Further, by adopting the method of the embodiment of the invention, the low-cost feature of the low-end MTC terminal can be maintained, and no development is needed. DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application. It will be apparent to those skilled in the art that other drawings may be obtained from these drawings without the inventive labor.

FIG. 1 is a flowchart of a channel detecting method according to an embodiment of the present invention;

FIG. 2 is a flowchart of step 102 in the channel detection method according to an embodiment of the present invention; FIG. 3 is another flowchart of step 102 in the channel detection method according to an embodiment of the present invention; A schematic structural diagram of a channel detecting device provided;

FIG. 5 is a schematic structural diagram of a channel estimation module in a channel detecting apparatus according to an embodiment of the present invention;

6 is another structure of a channel estimation module in a channel detecting apparatus according to an embodiment of the present invention. Schematic diagram

FIG. 7 is a hardware architecture diagram of a user equipment according to an embodiment of the present invention.

detailed description

The embodiments of the present invention provide a channel detection method, apparatus, and terminal. The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It is to be understood that the preferred embodiments described herein are merely illustrative and It is not intended to limit the invention. And in the case of no conflict, the features in the embodiments and the embodiments of the present application can be combined with each other.

In the LTE system, the resources occupied by the PCFICH and the PHICH are in units of Resource Element Groups (REGs). Wherein, each PCFICH is mapped on 4 REGs, and each PHICH channel is mapped on 3 or 2 REGs, and multiple PHICH channels can be code-multiplexed on the same REG resource. The REG is composed of a plurality of consecutive different REs (Resource Elements) in the same OFDM symbol, and the size of the REG is related to whether there is a CRS on the OFDM symbol. If there is a CRS on one OFDM symbol, each REG in the OFDM includes 6 REs, and two of the 6 REs are to be used for CRS mapping, and the other 4 REs are used for PCFICH or PHICH channel. If there is no CRS on the OFDM symbol, then each REG within the OFDM contains 4 REs, which are used for the PCFICH or PHICH channel. Therefore, in general, the PCFICH channel is mapped on 16 REs (that is, four REGs), and the PHICH channel is mapped on 12 (that is, three REGs) REs.

In addition, in the LTE system, the PCFICH is mapped only on the first OFDM symbol, and the PHICH can be mapped in a normal duration or an extended duration manner. The "normal duration" indicates that the PHICH is mapped only on the first OFDM symbol, and the "extended duration" indicates that the PHICH is mapped on multiple OFDM symbols. The protocol has a specific number of OFDM symbols occupied by the "extended duration" mapping mode of the PHICH. Provisions. In addition, 3 REG or PHICH channel transmissions occupied by PCFICH channel transmission occupy 3 The frequency interval between the REGs of the REG at the time of mapping, the protocol is also pre-defined, so that both the base station and the terminal can determine the frequency positions of the three REGs of the PCFICH channel or the three REGs of the PHICH channel.

Preferably, the method, device and terminal provided by the present invention are described in detail below with reference to the accompanying drawings.

The embodiment of the present invention provides an embodiment of a channel detection method. As shown in FIG. 1 , it is a flowchart of a channel detection method provided in Embodiment 1 of the present invention.

Step S101: Determine a target CRS on the RE adjacent to the resource element RE for PCFICH and/or PHICH transmission and carrying the common reference signal CRS.

Embodiments of the present invention can be applied to an MTC terminal. Since the MTC terminal can predetermine the RE resources for PCFICH and PHICH transmission, for the low-end MTC terminal, when it detects the PCFICH channel, it only needs to extract the data on the 16 REs corresponding to the PCFICH channel. And performing channel estimation according to the target CRS on the REs adjacent to the 16 REs and carrying the common reference signal CRS, the data on the 16 REs can be demodulated and decoded, thereby obtaining the CFI value and implementing the PCFICH channel. Detection. Similarly, for the detection of the PHICH channel, the low-end MTC terminal only needs to extract the data on the 12 REs corresponding to the PHICH channel, and perform channel estimation according to the target CRS on the REs adjacent to the 12 REs and carrying the CRS. Therefore, the data on the 12 REs is demodulated and decoded, so that the response information carried by the PHICH is obtained, and the PHICH channel detection is implemented. Therefore, first, the terminal needs to determine the target CRS on the RE that is adjacent to the RE used for PCFICH and/or PHICH transmission and that carries the CRS.

In the embodiment of the present invention, "adjacent" means that the number of intervals RE between the RE carrying the CRS and the RE used for PCFICH or PHICH transmission does not exceed a preset value, and based on the preset value The machine type communication terminal (MTC UE) stores the buffer size of the CRS (buffer size) smaller than the buffer size of the normal UE storage CRS. Specifically, the target CRS may be on other subcarriers within the same OFDM symbol as the RE used for PCFICH and/or PHICH transmission. The CRS may also be a CRS within an OFDM symbol adjacent to the RE used for PCFICH and/or PHICH transmission. However, because the requirements of the channel detection are different, for example, the accuracy, the algorithm complexity, or the cost are uncertain, the embodiment of the present invention does not provide the specific number of "target CRSs", and the time domain resource location and frequency of the target CRS. The number of REs corresponding to the domain resource location and the target CRS can be predetermined. Specifically, in the case that the base station pre-defines the number of antenna ports of the CRS, the number of target CRSs on each antenna port can be determined by a person skilled in the art according to channel detection requirements (eg, accuracy, algorithm complexity, or cost). And/or baseband signal processing capabilities are predetermined.

Step S102: Perform channel estimation of the PCFICH and/or PHICH channel according to the target CRS.

After determining the target CRS, the terminal can perform channel estimation of the PCFICH and/or PHICH channel according to the target CRS.

For the PCFICH channel estimation, as shown in FIG. 2, a flowchart for performing PCFICH channel estimation according to the target CRS may specifically include:

Step 201: Determine four resource element groups used in PCFICH channel transmission, including REG

Whether the RE carries the CRS in the RE, if yes, proceeds to step 202; if not, proceeds to step 203;

基站 Set the base station side to configure N CRS points ( port ) ( port O , , port ( Nl ) ), where N is a positive integer, and the typical value is 1, 2 or 4; then this step needs to determine the four resources used for PCFICH channel transmission. Whether the RE included in the element group REG has an RE bearer CRS;

Step 202: The CRS carried on the REs included in the four REGs is used as the target CRS, and the PCFICH channel estimation is performed according to the target CRS.

If the PCGICH channel occupies REG j ( j=0, , K-l ), it contains port i (i=0, ,

CRS of Nl), where K=4; channel estimation on port i (i=0, , Nl) of B'J REGj is based on CRS of port i in REGj and/or CRS of port i adjacent to REGj ; Step 203: Perform PCFICH channel estimation according to the target CRS.

Otherwise, the channel estimate on port i of REG j is based only on the CRS of port i adjacent to REG j.

For the PHICH channel estimation, referring to FIG. 3, a flowchart for performing PHICH channel estimation according to the neighboring CRS information may specifically include:

Step 301: Determine whether there are RE bearer CRSs in the REs included in the three resource element groups REG used for PHICH channel transmission, if yes, proceed to step 302; if no, proceed to step 303;

The base station is configured with N CRS ports ( ortO, , port ( Nl ) ), where N is a positive integer, and the typical value is 1, 2 or 4; in this step, it is necessary to first determine three resource element groups REG occupied by the PHICH channel. Whether the CRS is carried on the included RE.

Step 302: The CRS carried in the REs included in the three REGs is used as a target CRS, and the PHICH channel estimation is performed according to the target CRS.

If the PHICH channel occupies REG j ( j=0, , Kl ), the CRS of port i (i=0, , Nl ) is included, where K=3, the port i of the 'J REG j (i=0, The channel estimation on N1 is performed based on the CRS of port i in REG j and/or the CRS of port i adjacent to REG j; Step 303: Perform PHICH channel estimation according to the target CRS.

Step S103: Perform the PCFICH and/or PHICH channel detection according to the result of the channel estimation.

Then, according to the channel estimation result of step S102, demodulation detection of the PCFICH and/or PHICH channel is implemented, and the PCFICH and/or PHICH channel is detected.

It can be seen that, in the embodiment of the present invention, the CRS of the port i (i=0, , Nl ) is included in the REG j (j=0, , Kl ) occupied by the PCFICH channel or the PHICH channel, and the 'J PCFICH Or the channel estimation on port i in the REG j occupied by the PHICH channel may be based on the CRS of port i in REG j and/or the CRS of port i adjacent to REG j; otherwise, the channel estimation on port i of REG j It can only be based on the CRS of the port i adjacent to REG j. The CRS of the neighboring port i occupies a part of the port i CRS on the entire carrier within one subframe.

In the embodiment of the present invention, the terminal only needs to perform channel estimation based on the CRS carried on the RE included in the REG and/or the CRS on the RE that is adjacent to the RE used by the PCFICH and/or the PHICH channel transmission, and the CRS. The low-end MTC terminal only needs to store a limited CRS value, and can perform narrowband channel estimation based on the limited CRS, and implement demodulation detection of the PCFICH and/or the PHICH channel. Further, the method of the embodiment of the present invention does not need to be low-end. The MTC terminal is developed to maintain the low cost of low-end MTC terminals. Based on the same inventive concept, the channel detection method according to the above embodiment of the present invention, correspondingly, the embodiment of the present invention further provides a channel detection apparatus, and the structure diagram thereof is as shown in FIG. 4, and specifically includes:

The determining module 401 is configured to determine a target CRS on the RE that is adjacent to the resource element RE used for PCFICH and/or PHICH transmission and carries the common reference signal CRS.

The neighboring CRS information is: a CRS that is close to the RE time-frequency resource, and includes a CRS that is close to other subcarriers in the same OFDM symbol as the RE, and/or a CRS in the OFDM symbol adjacent to the RE. The number of the neighboring CRSs is determined according to the requirements of PHICH and/or PCFICH channel detection.

The channel estimation module 402 is configured to perform channel estimation of the PCFICH and/or PHICH channel according to the target CRS.

Referring to FIG. 5, when the PCFICH channel estimation is performed, the channel estimation module 402 may specifically include:

a first determining sub-module 501, configured to determine four resource elements used for channel transmission of the PCFICH Whether the RE included in the REG included in the group REG carries the CRS;

The first estimation sub-module 502 is configured to: when the result of the first determining sub-module is YES, use the CRS carried in the REs included in the four REGs as the target CRS, and according to the target CRS Perform PCFICH channel estimation;

The second estimation sub-module 503 is configured to perform PCFICH channel estimation according to the target CRS if the result of the first determining sub-module is NO.

Referring to FIG. 6, when performing PHICH channel estimation, the channel estimation module may specifically include:

The second determining sub-module 601 is configured to determine whether the RE included in the three resource element groups REG used for PHICH channel transmission has a RE bearer CRS;

The third estimation sub-module 602 is configured to: according to the result of the second determining sub-module, the CRS carried in the RE included in the three REGs as the target CRS, and according to the target CRS PHICH channel estimation;

The fourth estimation sub-module 603 is configured to perform PHICH channel estimation according to the target CRS if the result of the second determining sub-module is NO.

The channel detection module 403 is configured to perform PCFICH and/or PHICH channel detection according to the result of the channel estimation.

In the embodiment of the present invention, the channel detecting apparatus only needs to perform channel estimation based on the CRS carried on the RE included in the REG and/or the CRS on the RE that is adjacent to the RE used by the PCFICH and/or the PHICH channel transmission and carrying the CRS. Therefore, the low-end MTC terminal only needs to store a limited CRS value, and can perform narrowband channel estimation based on the limited CRS, and implement demodulation detection of the PCFICH and/or PHICH channel. Referring to FIG. 7, a hardware architecture diagram of a user equipment according to an embodiment of the present invention includes at least one processor 701 (eg, a CPU), at least one network interface 702, or other communication interface. A memory 703, and at least one communication bus 704, are used to implement connection communication between the devices. The processor 701 is configured to execute an executable module, such as a computer program, stored in the memory 703. The memory 703 may include a high speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory such as at least one disk memory. The communication connection between the system gateway and at least one other network element is implemented by at least one network interface 702 (which may be wired or wireless), and may use an Internet, a wide area network, a local network, a metropolitan area network, or the like. In some embodiments, the memory 703 stores program instructions for execution by the processor 701, the program instructions being executable by the processor 701, the program instructions comprising a determination module 401 channel estimation module 402 and a channel detection module 403, For the implementation of each module, reference may be made to the corresponding module disclosed in FIG. 4, and details are not described herein again. The device provided by the embodiment of the present invention only needs to perform channel estimation based on the CRS carried on the RE included in the REG and/or the CRS on the RE that is adjacent to the RE used in the PCFICH and/or the PHICH channel transmission and the CRS. The terminal MTC terminal only needs to store a limited CRS value, and then performs narrowband channel estimation based on the limited CRS, and implements demodulation detection of the PCFICH and/or PHICH channel. Based on the same inventive concept, the channel detection method according to the foregoing embodiment of the present invention, correspondingly, the embodiment of the present invention further provides an MTC terminal, and the terminal may include the foregoing channel detection apparatus. The method of the embodiment of the present invention does not need to develop the low-end MTC terminal, and can maintain the cost characteristics of the low-end MTC terminal.

It should be noted that, in this context, relational terms such as first and second are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply such entities or operations. There is any such actual relationship or order between them. Furthermore, the terms "comprising,""comprising," or "includes" or "includes" are intended to include a non-exclusive inclusion, such that a process, method, article, or device that includes a plurality of elements includes not only those elements but also of Other elements, or elements that are inherent to such a process, method, item, or device. An element defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in a process, method, article, or device that comprises the element, without further limitation. The spirit and scope of the Ming. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

1. A channel detection method, characterized by including:

Determine the target CRS on the RE that is adjacent to the resource element RE used for physical control format indication channel PCFICH and/or physical hybrid indication channel PHICH transmission and that carries the common reference signal CRS; the adjacent refers to: carrying the CRS The number of intervals between REs and REs used for PCFICH or PHICH transmission does not exceed the preset value, and the buffer size of the machine type communication terminal MTC UE storing CRS based on the preset value is smaller than that of the standard UE Buffer size to store CRS:

Perform channel estimation of the PCFICH and/or PHICH channel according to the target CRS; perform detection of the PCFICH and/or PHICH channel according to the result of the channel estimation.

2. The method of claim 1, wherein the PCFICH channel estimation based on the target CRS information includes:

Determine whether any of the REs included in the four resource element groups REG used for PCFICH channel transmission carries the CRS. If so, use the CRS carried in the REs included in the four REGs as the target CRS, and according to the The target CRS performs PCFICH channel estimation.

3. The method according to claim 1, characterized in that, performing PHICH channel estimation based on the target CRS information includes:

Determine whether any of the REs included in the three resource element groups REG used for PHICH channel transmission carries the CRS. If so, use the CRS carried in the REs included in the three REGs as the target CRS, and according to the The target CRS performs PHICH channel estimation.

4. The method of claim 1, wherein the target CRS includes: CRS on other subcarriers within the same orthogonal frequency division multiplexing OFDM symbol as the RE used for PCFICH and/or PHICH transmission, and/or, CRS within OFDM symbols adjacent to REs used for PCFICH and/or PHICH transmission.

5. The method of claim 1, wherein the time domain resource bit of the target CRS The location, frequency domain resource location and number of REs corresponding to the target CRS are predetermined.

6. The method according to claim 5, wherein the time domain resource location, frequency domain resource location and number of REs corresponding to the target CRS are specifically based on the requirements of PHICH and/or PCFICH channel detection. and/or baseband signal processing capabilities are predetermined.

7. A channel detection device, characterized in that it includes:

Determining module, configured to determine the target CRS on the RE that is adjacent to the resource element RE used for PCFICH and/or PHICH transmission and that carries the common reference signal CRS; the adjacent refers to: the RE that carries the CRS and The number of intervals RE between REs used for PCFICH or PHICH transmission does not exceed the preset value, and the buffer size of the machine type communication terminal MTC UE to store CRS based on the preset value is smaller than the buffer size of the standard UE to store CRS. buffer size;

A channel estimation module, configured to perform channel estimation of the PCFICH and/or PHICH channel based on the target CRS;

A channel detection module, configured to perform PCFICH and/or PHICH channel detection based on the result of the channel estimation.

8. The device according to claim 7, wherein the channel estimation module includes: a first judgment sub-module, used to judge whether there are REs among the REs included in the four resource element groups REG used for PCFICH channel transmission. Host CRS;

The first estimation sub-module is configured to use the CRS carried in the REs included in the four REGs as the target CRS when the result of the first judgment sub-module is yes, and perform the evaluation based on the target CRS. PCFICH channel estimation.

9. The device according to claim 7, characterized in that the channel estimation module includes: a second judgment sub-module, used to judge whether there are REs among the REs included in the three resource element groups REG used for PHICH channel transmission. Host CRS;

The second estimation submodule is configured to use the CRS carried in the REs included in the three REGs as the target CRS when the result of the second judgment submodule is yes, and use the target CRS according to the target CRS. Perform PHICH channel estimation.

10. An MTC terminal, characterized in that it includes the device according to any one of claims 7 to 9.

11. An MTC terminal, including at least one processor, at least one network interface or other communication interface, memory, and at least one communication bus, used to realize connection communication between these devices; wherein,

Program instructions for execution by the processor are stored, wherein the program instructions include a determination module, a channel estimation module and a channel detection module; the determination module is used to determine resources used for PCFICH and/or PHICH transmission The target CRS on the RE that is adjacent to the element RE and carries the common reference signal CRS; the adjacent refers to: The interval between the RE carrying the CRS and the RE used for PCFICH or PHICH transmission does not exceed the predetermined number of REs. The set value, and the buffer size of the machine type communication terminal MTC UE storing CRS based on the preset value is smaller than the buffer size of the standard UE storing CRS: The channel estimation module is used to calculate the target CRS according to the target CRS. Perform channel estimation of the PCFICH and/or PHICH channel; the channel detection module is configured to perform PCFICH and/or PHICH channel detection based on the result of the channel estimation.