WO2013139012A1

WO2013139012A1 - Enhanced downlink control channel sending method, detection method, and device

Info

Publication number: WO2013139012A1
Application number: PCT/CN2012/072729
Authority: WO
Inventors: 张元涛; 张健; 王轶; 周华
Original assignee: 富士通株式会社
Priority date: 2012-03-21
Filing date: 2012-03-21
Publication date: 2013-09-26
Also published as: CN103988562A; CN103988562B

Abstract

Embodiments of the present invention provide an enhanced downlink control information sending method, detection method, and device. The method comprises: a base station selecting, according to a determined aggregation level of a mobile station, a candidate position corresponding to the aggregation level in a search space allocated to the mobile station, and sending an enhanced downlink control channel (ePDCCH) to the mobile station at the selected candidate position (401); the base station determining an antenna port of a pilot reference symbol according to a preset index of a residing enhanced control channel element (eCCE) on a lowest resource block on a frequency domain in a search space allocated when the aggregation level is 1 and a preset corresponding relationship between the eCCE and the antenna port (402); and the base station sending the pilot reference symbol to the mobile station on a resource corresponding to the determined antenna port (403). According to the method and device provided in the embodiments of the present invention, the complexity of channel estimation performed by the mobile station can be reduced.

Description

Transmission method, I method and device for enhanced downlink control channel

The present invention relates to a wireless communication technology, and more particularly to a method, a detection method, and an enhanced downlink control channel for an LTE (Long Term Evolution)/LTE-A (LTE-Advanced, Enhanced Long Term Evolution) system. Device. Background technique

In LTE el. 8/9/10, the base station uses the physical downlink control channel (PDCCH) to transmit control information, such as downlink scheduling information. In LTE Rel. 11, in order to expand the capacity of the control channel, it has been decided to introduce an enhanced downlink control channel (ePDCCH). The ePDCCH is transmitted in the data area, and is used in a frequency division multiplexing manner with a PDSCH (Physical Downlink Shared Channel).

As shown in FIG. 1 , a minimum unit constituting an ePDCCH is an eCCE (enhanced control channel element), and a physical resource block (PRB) may include multiple eCCEs, as shown in FIG. 2, one physical resource block. The (PRB pair) includes four eCCEs, one eCCE includes three subcarriers in the frequency domain (f), and all OFDM symbols except the PDCCH are included in the time domain (t). The eCCE in a PRB pair may carry the ePDCCH of different mobile stations. If the aggregation level of the mobile station 1 is 1, the base station may send the ePDCCH to the eCCEl, and the aggregation level of the mobile station 2 is 2. eCCE2 and eCCE3 send ePDCCH and the like for them.

Currently, the ePDCCH uses channel demodulation reference symbols (DM-RS, DeModulation Reference Symbol) for channel estimation. The available DM-RS antenna ports are ports 7-10. One question is how does the mobile station know which antenna port is used? One solution to this problem is that the base station is explicitly configured for each mobile station with an antenna port, either in a semi-static or dynamic manner. Another solution is that there is a predetermined correspondence between the eCCE and the antenna port. As shown in FIG. 3, if the search space of the aggregation level 1 of the mobile station 1 includes the eCCEl in FIG. 3(a), the corresponding , this mobile station will use port 7 for channel estimation. If the mobile station's aggregation level 2 search space contains eCCE3 and eCCE4 in the right picture of Figure 3 (b), then the mobile station will use antenna port 9 for channel estimation.

The inventors have found that the above two solutions have their own advantages and disadvantages in the process of implementing the present invention, wherein Solution 1 will increase the signaling overhead. Solution 2 uses different antenna ports for different aggregation levels. Therefore, different antenna ports are needed for channel estimation, which increases the complexity of the mobile station receiver.

It should be noted that the above description of the technical background is only for the purpose of facilitating the clear and complete description of the technical solutions of the present invention, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be well known to those skilled in the art simply because these solutions are set forth in the background section of the present invention. Summary of the invention

An object of the embodiments of the present invention is to provide a method, a method, and a device for transmitting an enhanced downlink control channel, so as to reduce the complexity of channel estimation by a mobile station.

According to an aspect of the embodiments of the present invention, a method for transmitting an enhanced downlink control channel is provided, where the method includes:

The base station selects, according to the determined aggregation level of the mobile station, a candidate location corresponding to the aggregation level in the search space allocated to the mobile station, and sends an enhanced downlink control channel to the mobile station at the selected candidate location. (ePDCCH);

The base station determines the pilot reference according to the index of the resident eCCE on the lowest resource block in the frequency domain in the search space allocated according to the preset aggregation level of 1, and the correspondence between the preset eCCE and the antenna port. Symbolic antenna port;

The base station transmits the pilot reference symbol to the mobile station on the resource corresponding to the determined antenna port. According to an aspect of the embodiments of the present invention, a method for detecting an enhanced downlink control channel is provided, where the method includes:

The mobile station detects the ePDCCH on the search space corresponding to each determined aggregation level;

The mobile station determines the pilot according to the index of the resident eCCE on the lowest resource block in the frequency domain in the search space allocated according to the preset aggregation level of 1, and the correspondence between the preset eCCE and the antenna port. Reference symbol antenna port;

The mobile station performs channel estimation according to the antenna port of the pilot reference symbol, and demodulates the ePDCCH according to the result of the channel estimation.

According to an aspect of the present invention, a base station is provided, where the base station includes: a first sending unit, configured to select, in a search space allocated for the mobile station, according to a determined aggregation level of the mobile station, a candidate location of the aggregation level, sent to the mobile station at the selected candidate location Sending an enhanced downlink control channel (ePDCCH);

a determining unit, which is determined according to an index of the resident eCCE on the lowest resource block in the frequency domain in the search space allocated according to the preset aggregation level of 1, and a correspondence between the preset eCCE and the antenna port. Antenna port of the pilot reference symbol;

And a second sending unit that sends the pilot reference symbol to the mobile station on a resource corresponding to the antenna port determined by the determining unit.

According to an aspect of the embodiments of the present invention, a mobile station is provided, where the mobile station includes: a detecting unit that detects an ePDCCH on a search space corresponding to each determined aggregation level; a determining unit, according to The pre-set aggregation level is an index of the resident eCCE on the lowest resource block in the frequency domain, and a correspondence between the preset eCCE and the antenna port, and the antenna port of the pilot reference symbol is determined;

And a processing unit, configured to perform channel estimation according to an antenna port of the pilot reference symbol determined by the determining unit, and demodulate the ePDCCH according to a result of the channel estimation.

According to an aspect of an embodiment of the present invention, a computer readable program is provided, wherein, when the program is executed in a terminal device, the program causes the computer to perform the cooperative multipoint transmission mode in the terminal device Information feedback method.

According to another aspect of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an information feedback method in the cooperative multipoint transmission mode described above in a terminal device .

According to still another aspect of the embodiments of the present invention, a computer readable program is provided, wherein, when the program is executed in a base station, the program causes a computer to execute information in the cooperative base station in the cooperative multipoint transmission mode in the base station Feedback configuration method.

According to still another aspect of the embodiments of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an information feedback configuration method in a cooperative multipoint transmission mode in a base station .

The embodiments of the present invention have the following advantages: the embodiment of the present invention reduces the complexity of the channel estimation of the mobile station by using the same antenna port for all decoding candidate locations based on the correspondence between the preset eCCE and the antenna port. .

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the The way that can be adopted. It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprising" is used to mean the presence of a feature, component, step or component, but does not exclude the presence or addition of one or more other features, components, steps or components. DRAWINGS

Many aspects of the invention can be better understood with reference to the following drawings. The components in the figures are not drawn to scale, but only to illustrate the principles of the invention. To facilitate the illustration and description of some parts of the invention, the corresponding parts in the drawings may be enlarged or reduced. The elements and features described in one of the figures or one embodiment of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the In the drawing:

FIG. 1 is a schematic diagram of a current location of an ePDCCH;

2 is a schematic structural view of an eCCE;

3 is a schematic diagram of correspondence between an eCCE and an antenna port;

4 is a flowchart of a method for transmitting an ePDCCH according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for detecting an ePDCCH according to an embodiment of the present invention;

6 is a schematic diagram of an embodiment of a search space of an ePDCCH;

7 is a schematic diagram of another embodiment of a search space of an ePDCCH;

8 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 9 is a schematic diagram showing the composition of a mobile station according to an embodiment of the present invention. detailed description

The foregoing and other features of the embodiments of the invention will be apparent from the These embodiments are merely exemplary and are not limiting of the invention. In order to enable a person skilled in the art to easily understand the principles and embodiments of the present invention, an embodiment of the present invention uses an ePDCCH transmission and detection method. For example, it should be understood that the embodiments of the present invention are not limited thereto, and are applicable to other systems involving control channel transmission.

In the following description, the terms "base station" and "mobile station" are used as entities for implementing the ePDCCH transmission and detection method of the embodiments of the present invention, however, the term is merely exemplary, and in the art, other An entity having a function of transmitting/detecting an ePDCCH is used to replace a base station/mobile station, or an entity having the same function is represented by other terms, and the embodiment is not limited thereto.

Example 1

The embodiment of the invention provides a method for transmitting an enhanced downlink control channel. Figure 4 is a flow chart of the method. Referring to Figure 4, the method includes:

Step 401: The base station selects, according to the determined aggregation level of the mobile station, a candidate location corresponding to the aggregation level in the search space allocated to the mobile station, and sends an enhanced type to the mobile station in the selected candidate location. Downlink control channel (ePDCCH);

Step 402: The base station determines the pilot reference according to the index of the resident eCCE on the lowest resource block in the frequency domain in the search space according to the preset aggregation level of 1, and the correspondence between the preset eCCE and the antenna port. Symbolic antenna port;

Step 403: The base station sends the pilot reference symbol to the mobile station on the resource corresponding to the determined antenna port.

In this embodiment, the eNodeB first determines the aggregation level for the mobile station, and corresponds to different aggregation levels, and the ePDCCH included in the ePDCCH is different. For example, according to the current standard, when the aggregation level is 1, the PDCCH includes one CCE, and the CCE can be sent in six possible locations. When the aggregation level is 2, the PDCCH includes two CCEs, and the two CCEs. It can be sent in 6 possible locations; when the aggregation level is 4, the PDCCH contains four CCEs, which can be sent in 2 possible locations.

In this embodiment, after determining, by the mobile station, the aggregation level, the base station may select, according to the determined aggregation level, a candidate location corresponding to the aggregation level in the search space allocated to the mobile station, where the candidate location is selected. The ePDCCH (one or more eCCEs) is sent for the mobile station. For example, the base station determines, according to its policy, that the aggregation level of the UE1 is L=2, the base station selects a candidate location corresponding to L=2 in the search space allocated to the UE1, and sends the ePDCCH to the UE1 at the selected candidate location. (two eCCEs).

In this embodiment, a resident eCCE may be set in advance in the lowest resource block in the frequency domain in the search space allocated when the aggregation level is 1, and the index of the resident eCCE and the preset eCCE and the antenna are used. The correspondence between the ports determines the antenna port of the pilot reference symbol. Wherein, when the base station sends the ePDCCH to the mobile station through one antenna port, the eCCE with the index of 0, 1, 2, or 3 on the lowest resource block in the frequency domain in the search space allocated when the aggregation level is 1 may be set as the resident. The eCCE is reserved. When the eNodeB sends the ePDCCH to the mobile station through the two antenna ports, the eCCE with the index of 1 or 2 on the lowest resource block in the frequency domain in the search space allocated at the aggregation level of 1 can be set as the resident eCCE.

Wherein, the preset resident eCCEs may be the same or different for different mobile stations. The corresponding relationship between the eCCE and the antenna port is also preset. For example, the corresponding relationship shown in FIG. 3 may be used, that is, the eCCE with the index 0 corresponds to the antenna port 7; the eCCE with the index 1 corresponds to the antenna port 8; The eCCE of 2 corresponds to the antenna port 9; the eCCE with index 3 corresponds to the antenna port 10. When the eCCE with the index of 2 on the lowest resource block in the frequency domain is set to be the pre-set eCCE, the antenna port of the pilot reference symbol is determined to be the antenna port 9 according to the correspondence between the eCCE and the antenna port. .

In this embodiment, when the antenna port of the pilot reference symbol is determined, the base station may send a pilot reference symbol to the mobile station on the resource corresponding to the antenna port, so that the mobile station demodulates the channel according to the pilot reference symbol. The ePDCCH obtained by blind detection.

In this embodiment, the resident eCCE is preset on the lowest resource block in the frequency domain of the search space allocated when the aggregation level is 1, and the pilot reference symbol is sent on the antenna port corresponding to the resident eCCE. Therefore, the mobile station only needs to know the resident eCCE. Regardless of the aggregation level, the antenna port corresponding to the resident eCCE can be used for channel estimation, which reduces the complexity of the channel estimation by the mobile station.

Example 2

The embodiment of the invention further provides a method for detecting an enhanced downlink control channel. Figure 5 is a flow chart of the method. Referring to Figure 5, the method includes:

Step 501: The mobile station detects its ePDCCH on the search space corresponding to each determined aggregation level. Step 502: The mobile station indexes the eCCE on the lowest resource block in the frequency domain according to the preset aggregation level. And determining a correspondence between the eCCE and the antenna port, and determining an antenna port of the pilot reference symbol;

Step 503: The mobile station performs channel estimation according to the antenna port of the pilot reference symbol, and demodulates the ePDCCH according to the result of the channel estimation.

In this embodiment, the step 501 corresponds to the step 401 of the embodiment 1, when the base station selects a candidate location in the search space allocated for the mobile station, and sends the ePDCCH of the mobile station, Only the search space of its ePDCCH is known, and it is not known at which candidate location its ePDCCH is sent, and its own aggregation level is not known. Therefore, the mobile station first determines the search space of each aggregation level, and then detects in the search space. Its ePDCCH. The specific detection method can be implemented by using existing methods, and details are not described herein again.

In this embodiment, after determining the location of the ePDCCH, the mobile station needs to perform channel estimation by using the antenna port of the pilot reference symbol in order to correctly demodulate the detected ePDCCH. In this embodiment, the foregoing The corresponding resident eCCE and the correspondence between the eCCE and the antenna port are also known by the mobile station in a parameter configuration manner. Therefore, in this embodiment, the mobile station also uses the index of the resident eCCE and the eCCE and the antenna port. Correspondence relationship, the antenna port of the pilot reference symbol is determined.

In the same manner as the first embodiment, when the base station transmits the ePDCCH to the mobile station through one antenna port, when the preset aggregation level is 1, the eCCE on the lowest resource block in the frequency domain in the search space allocated is The index is 0, 1, 2 or 3. The eCCE with index 0 corresponds to antenna port 7; the eCCE with antenna 1 is corresponding to antenna port 8; the eCCE with index 2 corresponds to antenna port 9; the eCCE with index 3 corresponds to antenna terminal P 10.

In the same manner as the first embodiment, when the base station transmits the ePDCCH to the mobile station through two antenna ports, the eCCE on the lowest resource block in the frequency domain in the search space allocated when the preset aggregation level is 1. The index is 1 or 2. The eCCE with index 1 or 2 corresponds to antenna port 8 and antenna port 9.

In this embodiment, the mobile station determines the antenna port of the pilot reference symbol, and then uses the antenna port to perform channel estimation, thereby solving the detected ePDCCH.

In this embodiment, the same antenna port is used for different aggregation levels, and the same antenna port is used for channel estimation regardless of the aggregation level in which the mobile station detects the ePDCCH in the aggregation level, which reduces the channel estimation of the mobile station. the complexity.

In order to make the methods of Embodiment 1 and Embodiment 2 clearer and easier to understand, the methods of Embodiment 1 and Embodiment 2 will be described below with reference to specific examples.

6 is a schematic diagram of one embodiment of a search space of a mobile station.

Referring to FIG. 6, in this embodiment, the base station sends an ePDCCH to the mobile station through an antenna port, and the base station configures a search space of four PRB pairs for the mobile station. Each PRB pair contains 4 eCCEs. The first PRB pair is the lowest resource block in the frequency domain.

In this embodiment, the first PRB pair (the lowest resource block in the frequency domain) when the aggregation level is 1 is used in advance. The eCCE with the index of 2 is set to reside in the eCCE. According to the correspondence between the eCCE and the antenna port shown in FIG. 3, the resident eCCE corresponds to the antenna port 9.

In this embodiment, when the aggregation level is 1, the ePDCCH includes one eCCE, and the indexes of the four eCCEs in each PRB pair are assumed to be 0, 1, 2, and 3 respectively; when the aggregation level is 2, the ePDCCH includes For two eCCEs, it can be assumed that index 4 corresponds to eCCEO and eCCEl, assuming that index 5 corresponds to eCCE2 and eCCE3; when the aggregation level is 4, the ePDCCH contains four eCCEs, and it can be assumed that index 6 corresponds to eCCEO-eCCE3. It can be seen that index 4 is the upper index of index 0, 1, index 5 is the upper index of index 2, 3, and index 6 is the upper index of index 1, 2, 3, 4.

In this embodiment, the base station sends an ePDCCH to the mobile station by using the method in this embodiment, and selects an antenna port (port 9) corresponding to the eCCE (eCCE2) to transmit a pilot reference symbol to the mobile station. The mobile station obtains the location of its ePDCCH by blind detection. The parameter configuration (that is, pre-set), the mobile station can also know that the index of the eCCE included in the search space of the aggregation level 1 is the eCCE with the index of 2 in the PRB pair, and the inside of the first PRB pair The eCCE with index 2 is the eCCE for which it resides. Then, the eCCE included in the aggregation level 2 of the mobile station must be the upper index of the eCCE where the aggregation level 1 is located. As shown in Figure 6, aggregation level 1 contains index 2, and its upper index is 5, which contains eCCE2 and eCCE3 of the first PRB pair. By analogy, the corresponding index 6 in aggregation level 4 contains all eCCEs in the first PRB pair.

Thus, if the search space corresponding to each aggregation level is known to the mobile station in the manner shown in FIG. 6, and the correspondence between the eCCE and the antenna port corresponds in the manner shown in FIG. 3(a). The mobile station can use the index of the antenna port corresponding to the eCCE to perform channel estimation, regardless of the aggregation level in which the base station sends the control signaling to the mobile station.

In the embodiment of FIG. 6, the example is that the base station sends the ePDCCH to the mobile station through one antenna port. When the base station sends the ePDCCH to the mobile station through the two antenna ports, only the search space allocated when the aggregation level is 1 can be selected. The eCCE with the index of 1 or 2 in the lowest resource block in the frequency domain is the eCCE for which it resides. The corresponding antenna port is port 8 and port 9.

The reason for the above configuration is mainly to consider the following factors.

If index 2 is selected, although port 8 and port 9 can be corresponding, port 9 and port 10 can also be corresponding. However, if antenna ports 8 and 9 are corresponding, the eCCEl of the corresponding antenna port 8 can be allocated to other UEs, for example. It is allocated as another UE that has an eCCE index of 0 and an aggregation level of 2, which reduces resource waste. If the corresponding antenna ports 9 and 10, then the corresponding port 10 index is 3 eCCE, That is, eCCE3 is vacated. Since there is no corresponding antenna port, the resources of this eCCE3 are wasted.

Similarly, if index 1 is selected, although it can correspond to port 7 and port 8, it can also correspond to port 8 and port 9, but when corresponding to port 7 and port 8, the resource of eCCEl is wasted, so it is better to correspond to port 8. And port 9.

In addition, the eCCE with an index of 0 or 3 is not selected as its resident eCCE, and the problem of waste of resources is also considered. For example, if the eCCE with the index of 0 is selected as the eCCE, it can only correspond to the ports 7 and 8, which will cause the waste of the eCCEl of the corresponding port 8. The eCCE with the index of 3 is elected as the _e CCE. Ports 9 and 10 will waste resources of eCCE2 corresponding to port 9 previously.

7 is a schematic diagram of another embodiment of a search space of a mobile station.

Different from the embodiment of Fig. 6, in this embodiment, the ePDCCH of the mobile station has a different location on each PRB pair of the allocated search space. As shown in FIG. 6, taking L=l as an example, in the embodiment of FIG. 6, the location of the ePDCCH of the mobile station on each PRB pair of the allocated search space is eCCE2. As shown in FIG. 7, still taking L=l as an example, in the embodiment of FIG. 7, the location of the ePDCCH of the mobile station on each PRB pair of the allocated search space is eCCE2, eCCE3, eCCE0, eCCEl, respectively. .

The method of the embodiment of the present invention is equally applicable to the scenario of FIG. As shown in FIG. 7, on the four PRB pairs that are allocated, the first PRB pair is the lowest resource block in the frequency domain, and the same pre-set eCCE is also set on the first PRB pair. For example, an eCCE with an index of 0 when L=l is set as the resident eCCE. According to the correspondence between the eCCE and the antenna port shown in Fig. 3 (a), the resident eCCE corresponds to the antenna port 7. Then, the base station sends the ePDCCH and the pilot reference symbol to the mobile station according to the method of Embodiment 1, and the mobile station detects its ePDCCH according to the method of Embodiment 2, regardless of whether the aggregation level is 1, 2, 4 or 8, using the antenna port 7 Channel estimation, thereby reducing the complexity of mobile station channel estimation.

The resident eCCE is preset, and the base station and the mobile station can be preset by parameter configuration, and the embodiment is not limited thereto.

The embodiment of the present invention further provides a base station, as described in the following Embodiment 3. The principle of the base station is similar to that of the ePDCCH in the first embodiment. Therefore, the implementation of the base station can be implemented by referring to the method. It will not be repeated here.

Example 3

The embodiment of the invention provides a base station. FIG. 8 is a schematic diagram of the composition of the base station. Referring to FIG. 8, the base Station includes:

a first sending unit 81, according to the determined aggregation level of the mobile station, selecting a candidate location corresponding to the aggregation level in the search space allocated for the mobile station, and moving to the mobile station at the selected candidate location Transmitting an enhanced downlink control channel (ePDCCH);

a determining unit 82, which is based on an index of the resident eCCE on the lowest resource block in the frequency domain in the search space allocated according to the preset aggregation level of 1, and a correspondence between the preset eCCE and the antenna port, Determining an antenna port of a pilot reference symbol;

The second transmitting unit 83 transmits the pilot reference symbol to the mobile station on a resource corresponding to the antenna port determined by the determining unit 82.

In one embodiment,

When the first transmitting unit 81 sends the ePDCCH to the mobile station through one antenna port, when the preset aggregation level is 1, the resident of the lowest resource block in the frequency domain in the search space allocated is 1 The index of the eCCE is 0, 1, 2, or 3. The corresponding relationship between the eCCE and the antenna port may be: an eCCE with an index of 0 corresponding to the antenna port 7; an eCCE with an index of 1 corresponding to the antenna port 8; an eCCE with an index of 2 corresponding to the antenna port 9; an eCCE with an index of 3 corresponding to the antenna port 10.

In another embodiment,

When the first transmitting unit 81 sends the ePDCCH to the mobile station through two antenna ports, when the preset aggregation level is 1, the station on the lowest resource block in the frequency domain allocated in the search space is allocated. Leave the index of eCCE as 1 or 2. The correspondence between the eCCE and the antenna port may be that the eCCE with the index of 1 or 2 corresponds to the antenna port 8 and the antenna port 9.

The base station according to the embodiment of the present invention determines the antenna port of the pilot reference symbol according to the preset index of the resident eCCE, so that the mobile station uses the antenna port for channel estimation, which reduces the complexity of the channel estimation by the mobile station.

The embodiment of the present invention further provides a mobile station, as described in Embodiment 4 below. Since the principle of the mobile station solving the problem is similar to the method for detecting the ePDCCH of Embodiment 2, the implementation of the mobile station can refer to the method. Implementation, repetition will not be repeated.

Example 4

Embodiments of the present invention provide a mobile station. FIG. 9 is a schematic diagram of the composition of the mobile station. Referring to FIG. 9, the mobile station includes: a detecting unit 91, which detects an ePDCCH on a search space corresponding to each determined aggregation level; and a determining unit 92, which is configured on the lowest resource block in the frequency domain in the search space allocated according to a preset aggregation level of 1. The index of the resident eCCE, and the correspondence between the preset eCCE and the antenna port, and the antenna port of the pilot reference symbol;

The processing unit 93 performs channel estimation according to the antenna port of the pilot reference symbol determined by the determining unit 92, and demodulates the ePDCCH according to the result of the channel estimation.

When the base station sends the ePDCCH to the mobile station through one antenna port, the index of the eCCE on the lowest resource block in the frequency domain in the search space allocated by the preset aggregation level is 1, 1, 2 or 3. The corresponding relationship between the eCCE and the antenna port may be: an eCCE with an index of 0 corresponding to the antenna port 7; an eCCE with an index of 1 corresponding to the antenna port 8; an eCCE with an index of 2 corresponding to the antenna port 9; an eCCE with an index of 3 corresponding to the antenna port 10.

When the base station sends the ePDCCH to the mobile station through two antenna ports, the index of the eCCE on the lowest resource block in the frequency domain in the search space allocated when the preset aggregation level is 1 is 1 Or 2. The correspondence between the eCCE and the antenna port may be that the eCCE with index 1 or 2 corresponds to antenna port 8 and antenna port 9.

With the mobile station according to the embodiment of the present invention, the same antenna port can be used for channel estimation regardless of the aggregation level, which reduces the complexity of the mobile station channel estimation.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes the computer to execute the method for transmitting the ePDCCH according to Embodiment 1 in the base station.

The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the method for transmitting the ePDCCH according to Embodiment 1 in a base station.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a mobile station, the program causes the computer to execute the detection method of the ePDCCH described in Embodiment 2 in the mobile station.

The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the detection method of the ePDCCH described in Embodiment 2 in the mobile station.

The above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like. The invention also relates to A storage medium for storing the above programs, such as a hard disk, a magnetic disk, a compact disk, a DVD, a flash memory, or the like. The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that these descriptions are not intended to limit the scope of the invention. A person skilled in the art can make various modifications and changes to the present invention within the scope of the present invention.

Claims

Claim

A method for transmitting an enhanced downlink control channel, where the method includes:

The base station transmits the pilot reference symbol to the mobile station on the resource corresponding to the determined antenna port.

2. The method according to claim 1, wherein

When the eNodeB sends the ePDCCH to the mobile station through an antenna port, the index of the eCCE on the lowest resource block in the frequency domain in the search space allocated when the aggregation level is 1 is 0, 1, 2, or 3.

3. The method according to claim 2, wherein

The eCCE with index 0 corresponds to antenna port 7;

The eCCE with index 1 corresponds to antenna port 8;

The eCCE with index 2 corresponds to antenna port 9;

The eCCE with index 3 corresponds to antenna port 10.

4. The method according to claim 1, wherein

When the eNodeB sends the ePDCCH to the mobile station through two antenna ports, the index of the eCCE on the lowest resource block in the frequency domain in the search space allocated when the aggregation level is 1 is 1 or 2.

5. The method according to claim 4, wherein

The eCCE with index 1 or 2 corresponds to antenna port 8 and antenna port 9.

A method for detecting an enhanced downlink control channel, where the method includes:

The mobile station performs channel estimation according to the antenna port of the pilot reference symbol, and according to the result of channel estimation Demodulating the ePDCCH.

7. The method according to claim 6, wherein

When the base station sends the ePDCCH to the mobile station through an antenna port, the index of the eCCE on the lowest resource block in the frequency domain in the search space allocated by the preset aggregation level is 1 is 0, 1, 2 or 3.

8. The method according to claim 7, wherein

The eCCE with index 0 corresponds to antenna port 7;

The eCCE with index 1 corresponds to antenna port 8;

The eCCE with index 2 corresponds to antenna port 9;

The eCCE with index 3 corresponds to antenna port 10.

9. The method according to claim 6, wherein

When the base station transmits the ePDCCH to the mobile station through two antenna ports, the index of the eCCE on the lowest resource block in the frequency domain in the search space allocated when the preset aggregation level is 1 is 1 or 2 .

10. The method according to claim 9, wherein

The eCCE with index 1 or 2 corresponds to antenna port 8 and antenna port 9.

A base station, where the base station includes:

a first sending unit, configured to select, according to the determined aggregation level of the mobile station, a candidate location corresponding to the aggregation level in the search space allocated to the mobile station, and send the mobile station to the selected candidate location Enhanced downlink control channel (ePDCCH);

12. The base station according to claim 11, wherein

When the first transmitting unit sends the ePDCCH to the mobile station through one antenna port, the index of the eCCE on the lowest resource block in the frequency domain in the search space allocated when the preset aggregation level is 1. Is 0, 1, 2 or 3.

13. The base station according to claim 11, wherein When the first transmitting unit sends the ePDCCH to the mobile station through two antenna ports, when the preset aggregation level is 1, the eCCE on the lowest resource block in the frequency domain in the allocated search space is The index is 1 or 2.

14. A mobile station, wherein the mobile station comprises:

a detecting unit, which detects an ePDCCH on a search space corresponding to each determined aggregation level, and a determining unit that determines an index of the resident eCCE on the lowest resource block in the frequency domain according to a preset aggregation level of 1 And determining a correspondence between the eCCE and the antenna port, and determining an antenna port of the pilot reference symbol;

15. The mobile station according to claim 14, wherein

16. The mobile station according to claim 14, wherein

A computer readable program, wherein the program causes a computer to perform the transmission method of the enhanced downlink control channel according to any one of claims 1-5 in the base station when the program is executed in a base station.

18. A storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a method of transmitting an enhanced downlink control channel according to any one of claims 1-5 in a base station.

A computer readable program, wherein the program, when executed in a mobile station, causes the computer to perform the detection method of the enhanced downlink control channel according to any one of claims 6-10 in the mobile station.

20. A storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform the method of detecting an enhanced downlink control channel according to any one of claims 6-10 in a mobile station.