CN103988562A - Enhanced downlink control channel sending method, detection method, and device - Google Patents

Enhanced downlink control channel sending method, detection method, and device Download PDF

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Publication number
CN103988562A
CN103988562A CN201280061629.6A CN201280061629A CN103988562A CN 103988562 A CN103988562 A CN 103988562A CN 201280061629 A CN201280061629 A CN 201280061629A CN 103988562 A CN103988562 A CN 103988562A
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China
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ecce
mobile station
index
aggregation level
antenna port
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CN201280061629.6A
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CN103988562B (en
Inventor
张元涛
张健
王轶
周华
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Fujitsu Ltd
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Fujitsu Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

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

Enhanced downlink control channel sending method, detection method, and device
Sending method, the I method and apparatus technical fields of enhanced down control channel
The present invention relates to wireless communication technology, more specifically to LTE (Long Term Evolution, Long Term Evolution）/ LTE-A (LTE-Advanced, enhanced Long Term Evolution）The sending method of enhanced down control channel, detection method and device in system.Background technology
In LTE el.8/9/10, base station sends control information using Physical Downlink Control Channel (PDCCH, physical downlink control channel), as above down dispatch information etc..In LTE Rel.ll, to extend the capacity of control channel, determine to introduce enhanced down control channel (enhanced PDCCH, ePDCCH).EPDCCH is sent in data area, with PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) by the way of frequency division multiplexing.
As shown in Figure 1, the least unit for constituting an ePDCCH is eCCE (enhanced Control Channel Element), in a Physical Resource Block (PRB, Physical Resource Block) in can include multiple eCCE, as shown in Fig. 2 a Physical Resource Block pair（PRB pair) in comprising 4 eCCE, an eCCE comprising three subcarriers, includes whole OFDM symbols in addition to PDCCH on frequency domain (f) in time domain (t).ECCE inside a PRB pair may carry the ePDCCH of different mobile stations, aggregation level (aggregation level) such as mobile station 1 is 1, then base station can be its transmission ePDCCH with eCCEl, the aggregation level of mobile station 2 is 2, and base station can be its transmission ePDCCH etc. with eCCE2 and eCCE3.
At present, ePDCCH carries out channel estimation using demodulation reference mark (DM-RS, DeModulation Reference Symbol), and available DM-RS antenna port is port 7-10.One problem is how mobile station is known and employ that antenna portOne of solution of this problem be base station explicitly be allocated to each one antenna port of mobile station, pass through semi-static or dynamic mode.Another solution is that have a predetermined corresponding relation between eCCE and antenna port, as shown in Figure 3, if including the eCCEl in Fig. 3 (a) in the search space that the aggregation level of mobile station 1 is 1, then corresponding, this mobile station will carry out channel estimation using port 7.If the aggregation level of this mobile station is includes eCCE3 and eCCE4 in Fig. 3 (b) right figures in 2 search space, corresponding, this mobile station will carry out channel estimation using antenna port 9.
Inventor has found that both the above solution has respective advantage and disadvantage during the present invention is realized, wherein, Solution 1 will increase signaling consumption, and solution 2 employs different antenna ports for different aggregation levels, so needing to carry out channel estimation with different antenna ports, add the complexity of mobile station receiver.
It should be noted that the introduction to technical background is intended merely to the convenient explanation clear, complete to technical scheme progress above, and facilitates the understanding of those skilled in the art and illustrate.Can not be merely because these schemes be set forth in the background section of the present invention and think that above-mentioned technical proposal is known to those skilled in the art.The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of sending method, detection method and the device of enhanced down control channel, to reduce the complexity that mobile station carries out channel estimation.
One side according to embodiments of the present invention there is provided a kind of sending method of enhanced down control channel, wherein, methods described includes：
Base station is selected in the search space for the mobile station distribution according to the aggregation level of the mobile station of determination, a position candidate of the correspondence aggregation level, and enhanced down control channel is sent to the mobile station in selected position candidate（ePDCCH);
Base station according to aggregation level set in advance by 1 when the search space frequency domain distributed on resident eCCE on minimum resource block index, and the corresponding relation between eCCE set in advance and antenna port, determine the antenna port of pilot reference symbols；
Base station sends the pilot reference symbols in the corresponding resource of identified antenna port to the mobile station.One side according to embodiments of the present invention there is provided a kind of detection method of enhanced down control channel, wherein, methods described includes：
Mobile station it is determined that the corresponding search space of each aggregation level on, detect its ePDCCH;
Mobile station according to aggregation level set in advance by 1 when the search space frequency domain distributed on resident eCCE on minimum resource block index, and the corresponding relation between eCCE set in advance and antenna port, determine the antenna port of pilot reference symbols；
Mobile station carries out channel estimation according to the antenna port of the pilot reference symbols, and demodulates the ePDCCH according to the result of channel estimation.
One side according to embodiments of the present invention there is provided a kind of base station, wherein, the base station includes：First transmitting element, it is selected in the search space for the mobile station distribution according to the aggregation level of the mobile station of determination, a position candidate of the correspondence aggregation level, is sent out in selected position candidate to the mobile station Send enhanced down control channel（ePDCCH);
Determining unit, its according to aggregation level set in advance by 1 when the search space frequency domain distributed on resident eCCE on minimum resource block index, and the corresponding relation between eCCE set in advance and antenna port, determine the antenna port of pilot reference symbols；
Second transmitting element, it sends the pilot reference symbols in the corresponding resource of antenna port that the determining unit is determined to the mobile station.
One side according to embodiments of the present invention there is provided a kind of mobile station, wherein, the mobile station includes：Detection unit, its it is determined that the corresponding search space of each aggregation level on, detect its ePDCCH;Determining unit, it determines the antenna port of pilot reference symbols according to index of the aggregation level set in advance for the resident eCCE on resource block minimum on 1 time-frequency domain, and the corresponding relation between eCCE set in advance and antenna port；
Processing unit, the antenna port of its pilot reference symbols determined according to the determining unit carries out channel estimation, and demodulates the ePDCCH according to the result of channel estimation.
One side according to embodiments of the present invention, there is provided a kind of computer-readable program, wherein, when performing the program in terminal device, the program causes computer to perform the information feedback method under foregoing cooperation multipoint transmission mode in the terminal device.
Other side according to embodiments of the present invention there is provided a kind of storage medium for the computer-readable program that is stored with, wherein, the computer-readable program causes computer to perform the information feedback method under foregoing cooperation multipoint transmission mode in terminal device.
Another aspect according to embodiments of the present invention, there is provided a kind of computer-readable program, wherein, when performing the program in a base station, the program causes computer to perform the feedback of the information collocation method under foregoing cooperation multipoint transmission mode in the base station.
Another aspect according to embodiments of the present invention there is provided a kind of storage medium for the computer-readable program that is stored with, wherein, the computer-readable program causes computer to perform the feedback of the information collocation method under foregoing cooperation multipoint transmission mode in a base station.
The beneficial effect of the embodiment of the present invention is：The embodiment of the present invention is based on the corresponding relation between eCCE set in advance and antenna port, by all decoding position candidates（Candidate) using same antenna port, the complexity of mobile station channel estimation is reduced.
With reference to explanation hereinafter and accompanying drawing, only certain exemplary embodiments of this invention is disclose in detail, the original of the present invention is specified Reason can be in adopted mode.It should be understood that embodiments of the present invention are not so limited in scope.In the range of the spirit and terms of appended claims, embodiments of the present invention include many changes, modifications and equivalent.
Described for a kind of embodiment and/or the feature that shows can be used in same or similar mode in one or more other embodiments, it is combined with feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term " include/include " refers to the presence of feature, one integral piece, step or component when being used herein, but it is not precluded from the presence or additional of one or more further features, one integral piece, step or component.Brief description of the drawings
Many aspects of the present invention may be better understood with reference to following accompanying drawing.Part in accompanying drawing is not proportional drafting, and is intended merely to show the principle of the present invention.It may be exaggerated or minimized for the ease of showing and describing corresponding part in some parts of the present invention, accompanying drawing.The element and feature that element and feature described in a kind of accompanying drawing or embodiment of the present invention can be shown in one or more other accompanying drawings or embodiment are combined.In addition, in the accompanying drawings, similar label represents corresponding part in several accompanying drawings, and may be used to indicate the corresponding component used in more than one embodiment.In the accompanying drawings：
Fig. 1 is current ePDCCH regional location schematic diagram；
Fig. 2 is eCCE structural representation；
Fig. 3 is the corresponding relation schematic diagram of eCCE and antenna port；
Fig. 4 is the flow chart of the ePDCCH of embodiment of the present invention sending method；
Fig. 5 is the flow chart of the ePDCCH of embodiment of the present invention detection method；
Fig. 6 is the schematic diagram of one embodiment of ePDCCH search space；
Fig. 7 is the schematic diagram of the another embodiment of ePDCCH search space；
Fig. 8 is the composition schematic diagram of the base station of the embodiment of the present invention；
Fig. 9 is the composition schematic diagram of the mobile station of the embodiment of the present invention.Embodiment
Referring to the drawings, by following explanation, the foregoing and further feature of the embodiment of the present invention will be apparent.These embodiments are exemplary, are not limitations of the present invention.In order that those skilled in the art can easily understand that the principle and embodiment of the present invention, embodiments of the present invention are with ePDCCH transmission and detection method Exemplified by illustrate, it is to be understood that, the embodiment of the present invention is applicable not in this, as limitation for the other systems for being related to control channel transmission.
In the following description, the transmission and the entity of detection method of term " base station ", " mobile station " as the ePDCCH for implementing the embodiment of the present invention are used, but the term is exemplary, in the art, the entity that can also possess transmission/detection ePDCCH function by other replaces base station/mobile station, or the entity for possessing identical function is characterized by other terms, the present embodiment is not in this, as limitation.
Embodiment 1
The embodiments of the invention provide a kind of sending method of enhanced down control channel.Fig. 4 is the flow chart of this method, refer to Fig. 4, and this method includes：
Step 401:Base station is selected in the search space for the mobile station distribution according to the aggregation level of the mobile station of determination, a position candidate of the correspondence aggregation level, and enhanced down control channel is sent to the mobile station in selected position candidate（ePDCCH);
Step 402:The index of resident eCCE when base station is 1 according to aggregation level set in advance on resource block minimum in the frequency domain of search space, and the corresponding relation between eCCE set in advance and antenna port, determine the antenna port of pilot reference symbols；
Step 403:Base station sends the pilot reference symbols in the corresponding resource of identified antenna port to the mobile station.
In the present embodiment, base station first has to determine aggregation level for mobile station, and the different aggregation level of correspondence, the eCCE that ePDCCH is included is different.For example, according to current standard, when aggregation level is 1, PDCCH includes a CCE, and this CCE can be 6 possible positions（Candidate sent on)；When aggregation level is 2, PDCCH includes two CCE, and the two CCE can be sent on 6 possible positions；When aggregation level is 4, PDCCH includes four CCE, and this four CCE can be sent on 2 possible positions.
In the present embodiment, base station is that mobile station is determined after aggregation level, can be according to the aggregation level of determination, select in the search space for the mobile station distribution, to should aggregation level a position candidate, send its ePDCCH (- individual or multiple eCCE) in the position candidate of the selection for the mobile station.For example, base station determines that UE1 aggregation level is L=2 according to its strategy, then base station is in UE1 search space is distributed to, and a position candidate of selection correspondence L=2 sends its ePDCCH (two eCCE) in the position candidate of the selection for the UE1.
In the present embodiment, a resident eCCE is set in the search space frequency domain that can be distributed in advance when aggregation level is by 1 on minimum resource block, the index and eCCE set in advance and antenna of the resident eCCE is utilized The corresponding relation of port, determines the antenna port of pilot reference symbols.Wherein, when base station sends ePDCCH by an antenna port to mobile station, can by aggregation level by 1 when the search space frequency domain distributed on index on minimum resource block be 0,1,2 or 3 eCCE be set to resident eCCE, when base station sends ePDCCH by two antenna ports to mobile station, can by aggregation level by 1 when the search space frequency domain distributed on index is 1 or 2 on minimum resource block eCCE be set to resident eCCE.
Wherein, for different mobile stations, the resident eCCE set in advance can be the same or different.Wherein, the corresponding relation of eCCE and antenna port is also set in advance, for example, can be according to the corresponding relation shown in Fig. 3, namely index is 0 eCCE respective antennas port 7;Index the eCCE respective antennas port 8 for 1;Index the eCCE respective antennas port 9 for 2;Index the eCCE respective antennas port 10 for 3.When it is the eCCE that index is 2 on resource block minimum on 1 time-frequency domain to preset resident eCCE to be aggregation level, according to the eCCE and the corresponding relation of antenna port, the antenna port for determining pilot reference symbols is antenna port 9.
In the present embodiment, when the antenna port that pilot reference symbols are determined, base station can be in the corresponding resource of the antenna port to mobile station transmission pilot reference symbols, so that mobile station demodulates its ePDCCH obtained by blind Detecting according to the pilot reference symbols.
In the present embodiment, resident eCCE has been preset on the frequency domain for the search space distributed when aggregation level is by 1 on minimum resource block, and send pilot reference symbols on the corresponding antenna ports of resident eCCE, thus, mobile station only needs to know the resident eCCE, no matter aggregation level is how many, it may be by this and be resident the corresponding antenna port progress channel estimations of eCCE, reduce the complexity that mobile station carries out channel estimation.
Embodiment 2
The embodiment of the present invention additionally provides a kind of detection method of enhanced down control channel.Fig. 5 is the flow chart of this method, refer to Fig. 5, this method includes：
Step 501:Mobile station it is determined that the corresponding search space of each aggregation level on, detect its ePDCCH;Step 502:Mobile station determines the antenna port of pilot reference symbols according to index of the aggregation level set in advance for the eCCE on resource block minimum on 1 time-frequency domain, and the corresponding relation between eCCE set in advance and antenna port；
Step 503:Mobile station carries out channel estimation according to the antenna port of the pilot reference symbols, and demodulates the ePDCCH according to the result of channel estimation.
In the present embodiment, the step 401 of the step 501 correspondence embodiment 1, when base station is have selected in the search space for mobile station distribution after a position candidate sends the ePDCCH of the mobile station, due to mobile station Only know its ePDCCH search space, it is not aware that its ePDCCH is sent in which position candidate, the aggregation level of oneself is not known yet, therefore, mobile station determines the search space of each of which aggregation level first, and its ePDCCH is then detected in the search space.Wherein, specific detection method can be realized by existing means, will not be repeated here.
In the present embodiment, behind position where its ePDCCH is determined, mobile station is in order to correctly demodulate the ePDCCH that it is detected, need to carry out channel estimation first with the antenna port of pilot reference symbols, in the present embodiment, above-mentioned resident eCCE and eCCE and antenna port set in advance corresponding relation are similarly by way of parameter configuration known to mobile station, therefore, in the present embodiment, mobile station determines the antenna port of pilot reference symbols also according to the index of the resident eCCE and the corresponding relation of eCCE and antenna port.
It is same as Example 1, when base station sends the ePDCCH by an antenna port to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 0,1,2 or 3.Wherein, the eCCE respective antennas port 7 for 0 is indexed;Suo Gong | the eCCE respective antennas port 8 for being 1;Index the eCCE respective antennas port 9 for 2;Index the eCCE respective antennas end P 10 for 3.
Same as Example 1, when base station sends the ePDCCH by two antenna ports to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 1 or 2.Wherein, index as 1 or 2 eCCE respective antennas port 8 and antenna port 9.
In the present embodiment, mobile station determines the antenna port of pilot reference symbols, you can carries out channel estimation using the antenna port, and then solves its ePDCCH detected.
By in the present embodiment, identical antenna port is employed for different aggregation levels, no matter mobile station detects its ePDCCH in the search space of which aggregation level, all carries out channel estimation using identical antenna port, reduces the complexity of mobile station channel estimation.
To make the method for embodiment 1 and embodiment 2 more clear understandable, below in conjunction with specific example, the method to embodiment 1 and embodiment 2 is illustrated.
Fig. 6 is the schematic diagram of one embodiment of the search space of certain mobile station.
Fig. 6 is refer to, in the present embodiment, base station sends ePDCCH by an antenna port to the mobile station, and base station is the search space that the mobile station is configured with 4 PRB pair.Wherein, each PRB pair are respectively comprising 4 eCCE.Wherein, first PRB pair is resource block minimum on frequency domain.
In the present embodiment, (the minimum resource block on frequency domain of first PRB pair when by aggregation level being in advance 1） On index be set as resident eCCE, the corresponding relation of eCCE and antenna port according to Fig. 3, the resident eCCE respective antennas port 9 for 2 eCCE.
In the present embodiment, when aggregation level is 1, ePDCCH includes an eCCE, it can be assumed that the index of four eCCE in each PRB pair is respectively 0,1,2,3;When aggregation level is 2, ePDCCH includes two eCCE, it can be assumed that the correspondence of index 4 eCCEO and eCCEl, it is assumed that the correspondence of index 5 eCCE2 and eCCE3;When aggregation level is 4, ePDCCH includes four eCCE, it can be assumed that 6 corresponding eCCEO- eCCE3 of index.It can be seen that, index 4 is indexes 0,1 upper layer index, and index 5 is the upper layer indexs of index 2,3, and index 6 is the upper layer index of index 1,2,3,4.
In the present embodiment, base station sends ePDCCH, the corresponding antenna ports of the resident eCCE (eCCE2) of selection by the method for the present embodiment to mobile station（Port 9) send pilot reference symbols to mobile station.Mobile station obtains the position where its ePDCCH by blind check.Wherein pass through parameter configuration（Namely preset）, mobile station can also know that the eCCE included in the search space of its aggregation level 1 index is the eCCE that index is 2 inside 4 PRB pair, wherein the eCCE that the index inside first PRB pair is 2 is its resident eCCE.The eCCE that then mobile station is included in aggregation level 2 must be its aggregation level 1 place eCCE upper layer index.Aggregation level 1 includes index 2 in such as Fig. 6, and layer index is 5 thereon, includes first PRB pair eCCE2 and eCCE3.Analogize accordingly, manipulative indexing 6 in aggregation level 4 includes all eCCE in first PRB pair.
Thus, if the search space corresponding to each aggregation level is learnt in the way of being shown in Fig. 6 by mobile station, and the corresponding relation between eCCE and antenna port carries out correspondence in the way of being shown in Fig. 3 (a), then no matter base station sends control signaling in the position candidate of which aggregation level to the mobile station, mobile station can carry out channel estimation using the index of the corresponding antenna ports of resident eCCE.
In the embodiment in fig 6, it is exemplified by sending ePDCCH to mobile station by an antenna port by base station, when base station sends ePDCCH by two antenna ports to mobile station, can only selective polymerization rank by 1 when the frequency domain of search space that distributes on index is 1 or 2 in minimum resource block eCCE be its resident eCCE, now corresponding antenna port is port 8 and port 9.
Why above-mentioned configuration is carried out, be mainly in view of following factor.
If selected for index 2, although can be with corresponding ports 8 and port 9, can also corresponding ports 9 and port 10, but, if respective antenna port 8 and 9, the eCCEl of respective antenna port 8 can distribute to other UE and use before then, for example, be assigned as resident another UE that eCCE indexes are 0 and aggregation level is 2, so reduce the wasting of resources.If respective antenna port 9 and 10, then the eCCE that the index of corresponding ports 10 is 3 before, Namely eCCE3 is just by empty out, due to not corresponding antenna port, then this eCCE3 resource is just wasted.
Similarly, if selected for index 1, although can with corresponding ports 7 and port 8, can also corresponding ports 8 and port 9, in corresponding ports 7 and port 8, the eCCEl wasting of resources can be caused, therefore preferably corresponding ports 8 and port 9.
In addition, not selecting index to be resident eCCE, the problem of also allowing for the wasting of resources as it for 0 or 3 eCCE.For example, selection index is resident eCCE for 0 eCCE as it, can only corresponding ports 7 and 8, the eCCEl of corresponding ports 8 wasting of resources before causing；Selection index is resident as it for 3 eCCEeCCE, can only corresponding ports 9 and 10, the eCCE2 of corresponding ports 9 wasting of resources before causing.
Fig. 7 is the schematic diagram of the another embodiment of the search space of certain mobile station.
From unlike Fig. 6 embodiment, in the present embodiment, the position of the ePDCCH of the mobile station on each PRB pair for the search space distributed is different.As shown in fig. 6, by taking L=l as an example, in the embodiment in fig 6, the position of the ePDCCH of the mobile station on each PRB pair for the search space distributed is eCCE2.As shown in fig. 7, still by taking L=l as an example, in Fig. 7 embodiment, the position of the ePDCCH of the mobile station on each PRB pair for the search space distributed is eCCE2, eCCE3, eCCE0, eCCEl respectively.
The method of the embodiment of the present invention is equally applicable to Fig. 7 scene.As shown in Figure 7, on this four PRB pair distributed, first PRB pair is resource block minimum on frequency domain, then same that a resident eCCE is preset on first PRB pair, for example, index during L=l is set into the resident eCCE for 0 eCCE.The corresponding relation between eCCE and antenna port according to Fig. 3 (a), the resident eCCE respective antennas port 7.Then base station sends ePDCCH and pilot reference symbols according to the method for embodiment 1 to mobile station, mobile station detects its ePDCCH according to the method for embodiment 2, no matter its aggregation level is 1,2,4 or 8, channel estimation all is carried out using antenna port 7, the complexity of mobile station channel estimation is thereby reduced.
Wherein, resident eCCE is set in advance, and base station and mobile station can be preset by way of parameter configuration, and the present embodiment is not in this, as limitation.
The embodiment of the present invention additionally provides a kind of base station, as described in the following examples 3, because the principle that the base station solves problem is similar to the ePDCCH of embodiment 1 sending method, therefore implementations of the base station may refer to the implementation of method, repeatedly in place of repeat no more.
Embodiment 3
The embodiments of the invention provide a kind of base station.Fig. 8 is the composition schematic diagram of the base station, refer to Fig. 8, the base Station includes：
First transmitting element 81, it is according to the aggregation level of the mobile station of determination, select in the search space for the mobile station distribution, a position candidate of the correspondence aggregation level sends enhanced down control channel in selected position candidate to the mobile station（ePDCCH);
Determining unit 82, its according to aggregation level set in advance by 1 when the search space frequency domain distributed on resident eCCE on minimum resource block index, and the corresponding relation between eCCE set in advance and antenna port, determine the antenna port of pilot reference symbols；
Second transmitting element 83, it sends the pilot reference symbols in the corresponding resource of antenna port that the determining unit 82 is determined to the mobile station.
In one embodiment,
When first transmitting element 81 sends the ePDCCH by an antenna port to the mobile station, the index of the resident eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 0,1,2 or 3.Wherein, the corresponding relation of eCCE and antenna port can index the eCCE respective antennas port 7 for 0;Index the eCCE respective antennas port 8 for 1;Index the eCCE respective antennas port 9 for 2;Index the eCCE respective antennas port 10 for 3.
In another embodiment,
When first transmitting element 81 sends the ePDCCH by two antenna ports to the mobile station, the index of the resident eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 1 or 2.Wherein, the corresponding relation of eCCE and antenna port can be indexed as 1 or 2 eCCE respective antennas port 8 and antenna port 9.
By the base station of the embodiment of the present invention, according to resident eCCE set in advance index, the antenna port of pilot reference symbols is determined, so that mobile station carries out channel estimation using the antenna port, the complexity that mobile station carries out channel estimation is reduced.
The embodiment of the present invention additionally provides a kind of mobile station, as described in the following examples 4, because the principle that the mobile station solves problem is similar to the ePDCCH of embodiment 2 detection method, therefore implementations of the mobile station may refer to the implementation of method, repeatedly in place of repeat no more.
Embodiment 4
The embodiments of the invention provide a kind of mobile station.Fig. 9 is the composition schematic diagram of the mobile station, refer to Fig. 9, the mobile station includes： Detection unit 91, its it is determined that the corresponding search space of each aggregation level on, detect its ePDCCH;Determining unit 92, its according to aggregation level set in advance by 1 when the search space frequency domain distributed on resident eCCE on minimum resource block index, and the corresponding relation between eCCE set in advance and antenna port, determine the antenna port of pilot reference symbols；
Processing unit 93, the antenna port of its pilot reference symbols determined according to the determining unit 92 carries out channel estimation, and demodulates the ePDCCH according to the result of channel estimation.
Wherein, when base station sends the ePDCCH by an antenna port to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 0,1,2 or 3.Wherein, the corresponding relation of eCCE and antenna port can index the eCCE respective antennas port 7 for 0;Index the eCCE respective antennas port 8 for 1;Index the eCCE respective antennas port 9 for 2;Index the eCCE respective antennas port 10 for 3.
Wherein, when base station sends the ePDCCH by two antenna ports to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 1 or 2.Wherein, the corresponding relation of eCCE and antenna port can be indexed as 1 or 2 eCCE respective antennas port 8 and antenna port 9.
By the mobile station of the embodiment of the present invention, no matter polymerization grade is how many, may be by identical antenna port and carries out channel estimation, reduces the complexity of mobile station channel estimation.
The embodiment of the present invention additionally provides a kind of computer-readable program, wherein when performing the program in a base station, the program causes computer to perform the sending method of the ePDCCH described in embodiment 1 in the base station.
The embodiment of the present invention additionally provides a kind of storage medium for the computer-readable program that is stored with, and the wherein computer-readable program causes computer to perform the sending method of the ePDCCH described in embodiment 1 in a base station.
The embodiment of the present invention additionally provides a kind of computer-readable program, wherein when performing the program in a mobile station, the program causes computer to perform the detection method of the ePDCCH described in embodiment 2 in the mobile station.
The embodiment of the present invention additionally provides a kind of storage medium for the computer-readable program that is stored with, and the wherein computer-readable program causes computer to perform the detection method of the ePDCCH described in embodiment 2 in a mobile station.
Apparatus and method more than of the invention can be realized by hardware, can also be realized by combination of hardware software.The present invention relates to such computer-readable program, when the program is performed by logical block, the logical block can be made to realize devices described above or component parts, or the logical block is realized various methods or step described above.Logical block is such as the processor used in field programmable logic part, microprocessor, computer.The invention further relates to Storage medium for storing procedure above, such as hard disk, disk, CD, DVD, flash memory.Above in association with specific embodiment, invention has been described, it will be appreciated by those skilled in the art that these descriptions are all exemplary, it is not limiting the scope of the invention.Those skilled in the art can make various variants and modifications to the present invention according to spirit and principles of the present invention, and these variants and modifications are also within the scope of the invention.

Claims (1)

  1. Claims
    1st, a kind of sending method of enhanced down control channel, wherein, methods described includes：
    Base station is selected in the search space for the mobile station distribution according to the aggregation level of the mobile station of determination, a position candidate of the correspondence aggregation level, and enhanced down control channel is sent to the mobile station in selected position candidate（ePDCCH);
    Base station according to aggregation level set in advance by 1 when the search space frequency domain distributed on resident eCCE on minimum resource block index, and the corresponding relation between eCCE set in advance and antenna port, determine the antenna port of pilot reference symbols；
    Base station sends the pilot reference symbols in the corresponding resource of identified antenna port to the mobile station.
    2nd, according to the method described in claim 1, wherein,
    When the base station sends the ePDCCH by an antenna port to the mobile station, the index of the eCCE in the search space frequency domain distributed when aggregation level is by 1 on minimum resource block is 0,1,2 or 3.
    3rd, method according to claim 2, wherein,
    Index the eCCE respective antennas port 7 for 0;
    Index the eCCE respective antennas port 8 for 1;
    Index the eCCE respective antennas port 9 for 2;
    Index the eCCE respective antennas port 10 for 3.
    4th, according to the method described in claim 1, wherein,
    When the base station sends the ePDCCH by two antenna ports to the mobile station, the index of the eCCE in the search space frequency domain distributed when aggregation level is by 1 on minimum resource block is 1 or 2.
    5th, method according to claim 4, wherein,
    Index as 1 or 2 eCCE respective antennas port 8 and antenna port 9.
    6th, a kind of detection method of enhanced down control channel, wherein, methods described includes：
    Mobile station it is determined that the corresponding search space of each aggregation level on, detect its ePDCCH;
    Mobile station according to aggregation level set in advance by 1 when the search space frequency domain distributed on resident eCCE on minimum resource block index, and the corresponding relation between eCCE set in advance and antenna port, determine the antenna port of pilot reference symbols；
    Mobile station carries out channel estimation according to the antenna port of the pilot reference symbols, and according to the result of channel estimation Demodulate the ePDCCH.
    7th, method according to claim 6, wherein,
    When base station sends the ePDCCH by an antenna port to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 0,1,2 or 3.
    8th, method according to claim 7, wherein,
    Index the eCCE respective antennas port 7 for 0;
    Index the eCCE respective antennas port 8 for 1;
    Index the eCCE respective antennas port 9 for 2;
    Index the eCCE respective antennas port 10 for 3.
    9th, method according to claim 6, wherein,
    When base station sends the ePDCCH by two antenna ports to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 1 or 2.
    10th, method according to claim 9, wherein,
    Index as 1 or 2 eCCE respective antennas port 8 and antenna port 9.
    11st, a kind of base station, wherein, the base station includes：
    First transmitting element, it is according to the aggregation level of the mobile station of determination, select in the search space for the mobile station distribution, a position candidate of the correspondence aggregation level sends enhanced down control channel in selected position candidate to the mobile station（ePDCCH);
    Determining unit, its according to aggregation level set in advance by 1 when the search space frequency domain distributed on resident eCCE on minimum resource block index, and the corresponding relation between eCCE set in advance and antenna port, determine the antenna port of pilot reference symbols；
    Second transmitting element, it sends the pilot reference symbols in the corresponding resource of antenna port that the determining unit is determined to the mobile station.
    12nd, base station according to claim 11, wherein,
    When first transmitting element sends the ePDCCH by an antenna port to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 0,1,2 or 3.
    13rd, base station according to claim 11, wherein, When first transmitting element sends the ePDCCH by two antenna ports to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 1 or 2.
    14th, a kind of mobile station, wherein, the mobile station includes：
    Detection unit, its it is determined that the corresponding search space of each aggregation level on, detect its ePDCCH;Determining unit, it determines the antenna port of pilot reference symbols according to index of the aggregation level set in advance for the resident eCCE on resource block minimum on 1 time-frequency domain, and the corresponding relation between eCCE set in advance and antenna port；
    Processing unit, the antenna port of its pilot reference symbols determined according to the determining unit carries out channel estimation, and demodulates the ePDCCH according to the result of channel estimation.
    15th, mobile station according to claim 14, wherein,
    When base station sends the ePDCCH by an antenna port to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 0,1,2 or 3.
    16th, mobile station according to claim 14, wherein,
    When base station sends the ePDCCH by two antenna ports to the mobile station, the index of the eCCE in the search space frequency domain distributed when the aggregation level set in advance is by 1 on minimum resource block is 1 or 2.
    17th, a kind of computer-readable program, wherein, when performing the program in a base station, the program causes computer perform claim in the base station to require the sending method of the enhanced down control channel described in any one of 1-5.
    18th, a kind of storage medium for the computer-readable program that is stored with, wherein, the computer-readable program causes the sending method of enhanced down control channel of the computer in a base station described in perform claim requirement any one of 1-5.
    19th, a kind of computer-readable program, wherein, when performing the program in a mobile station, the program causes computer perform claim in the mobile station to require the detection method of the enhanced down control channel described in any one of 6-10.
    20th, a kind of storage medium for the computer-readable program that is stored with, wherein, the computer-readable program causes the detection method of enhanced down control channel of the computer in a mobile station described in perform claim requirement any one of 6-10.
CN201280061629.6A 2012-03-21 2012-03-21 Sending method, detection method and the device of enhanced down control channel Expired - Fee Related CN103988562B (en)

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