CN102938935B - Method for acquiring information channel reciprocity and controlling information interactively in frequency division duplex (FDD) heterogeneous network - Google Patents
Method for acquiring information channel reciprocity and controlling information interactively in frequency division duplex (FDD) heterogeneous network Download PDFInfo
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- CN102938935B CN102938935B CN201210469702.5A CN201210469702A CN102938935B CN 102938935 B CN102938935 B CN 102938935B CN 201210469702 A CN201210469702 A CN 201210469702A CN 102938935 B CN102938935 B CN 102938935B
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Abstract
The invention discloses a method for acquiring information channel reciprocity and controlling information interactively in a frequency division duplex (FDD) heterogeneous network and belongs to the field of wireless communication. The method includes configuring different reciprocity carriers for a Macro cell and a Pico cell and utilizing a time division duplex (TDD) frame structure as the reference to configure the frame structure of a reciprocity carrier wireless frame into an up time slot, a guard interval and a down time slot. The up time slot of the reciprocity carriers bears up pilot signals (SRS) and up control information. The down time slot of the reciprocity carriers bears down control information. When the wireless frame of the reciprocity carrier of the Macro cell or the reciprocity carrier of the Pico cell is the down time slot, the reciprocity carriers are respectively polymerized with down carriers in corresponding cells respectively. When the wireless frame of the reciprocity carrier of the Macro cell or the reciprocity carrier of the Pico cell is the up time slot, the reciprocity carriers are polymerized with up carriers in the corresponding cells. By means of the method, acquired resource of information channel reciprocity of an FDD system is small in expense and is accurate simultaneously, and interaction of the up control information and the down control information in the heterogeneous network is more accurate.
Description
Technical field
The present invention relates to a kind of be applicable to FDD heterogeneous network acquisition channel reciprocity and the method for interactive control information, obtain channel reciprocity in FDD system and interactive control information by frame structure configuration with carrier aggregation.Belong to wireless communication field.
Background technology
Isomerism is one of principal character of wireless network environment in the following a very long time.So-called isomerism refers to each several part of construction system property of there are differences in structure, function, character etc.In the process of the high speed of wireless communication technology, wide diversified development, in order to meet the demand to multiple business and transmission rate under different communication environments of user in future mobile communications, 3GPP proposes the concept of heterogeneous network, in whole macrocell, namely dispose the heterogeneous network of low power nodes.Typical low power nodes comprises relaying (Relay) node, Pico cell (Picocell) and femtocell (Femtocell), for the covering of indoor and hot zones and high-peed connection provide better guarantee, eliminate blind spot region simultaneously.The introducing of these new low power nodes, while enhancing community wireless coverage situation, also makes whole cell scenario more complicated, and disturbed condition is more serious, and device resource is more in short supply, community select and wireless access way all more flexible.Figure 1 shows that heterogeneous network operative scenario figure.
Channel reciprocity is the internal characteristics of time division multiplexing (TDD) system, in TDD system, up link (UL) shares identical frequency range with down link (DL), by obtaining the CSI of UL/DL to the measurement of DL/UL channel condition information (CSI), eliminate the overhead that channel feedback is brought.
In frequency division multiplexing (FDD) system, because up-downgoing channel exists certain frequency interval, the channel quality of up channel can not reflect the channel quality of down channel, and therefore base station end is realized by the feedback of up channel usually to the acquisition of descending CSI.In traditional channel feedback method, user side obtains descending CSI by channel estimating, there is channel estimation errors; Base station end only can obtain the descending channel information after quantification, there is quantization error; And also can error of transmission be there is when feedback channel transmits in the CSI quantized.
Heterogeneous network owing to disposing low power nodes in whole macrocell, and make whole cell scenario more complicated, disturbed condition is even more serious.The inside that in heterogeneous network, main plot (as Macro community) is respective with time community (as Pico community) all needs to carry out information interaction, as the descending control signaling of base station end and the up demand information of user side need to carry out alternately, and serious disturbed condition can reduce the accuracy that interactive information receives estimation.
Carrier aggregation can be that multiple carrier waves of continuous frequency spectrum are polymerized, and also can be the carrier aggregation of discontinuous spectrum, and the bandwidth of polymerization carrier wave can be identical or different.Concrete carrier aggregation also relies on the ability of terminal, the demand and network configuration etc. of business.Figure 2 shows that existing fdd mode carrier aggregation, wherein f1 and f4 is paired carrier wave, and f2 and f5 is paired carrier wave, and f3 is not paired carrier wave.The scheme of carrier aggregation is that f1 and f2 is aggregated into up-link carrier, and for uplink, f4, f5 and f3 aggregate into descending carrier, for downlink transfer.But, existing fdd mode carrier aggregation scheme, a certain carrier wave or bearing downlink transmission, or carrying uplink, thus cause the reciprocity of the up-downgoing channel of carrier wave to obtain.
Summary of the invention
Acquisition methods frequency spectrum resource expense for channel reciprocity in FDD system is comparatively large and accuracy is lower and the up-downgoing control information problem that accuracy is lower due to serious interference alternately in heterogeneous network, this patent proposes a kind of radio frames frame structure that adopts and configures the method obtaining channel reciprocity in FDD heterogeneous network interactive control information with carrier aggregation, make the Gains resources expense of FDD system channel reciprocity less and more accurate simultaneously, also make the more accurate alternately of ascending control information and Downlink Control Information in heterogeneous network.
For achieving the above object, the inventive method comprises the steps:
Wherein Macro community refers to the macrocell in heterogeneous network, the Microcell of Pico community finger low-power node.
Step 1 be Macro community and each Pico community configurating channel reciprocity carrier wave respectively belonging to this Macro community together, and the channel reciprocity carrier wave that Macro community and each Pico community belonging to this Macro community together adopt each other Bu Tong frequently; The channel reciprocity carrier wave that each Pico community adopts is with frequently;
Step 2, (in FDD heterogeneous network system, the frame structure type of reciprocity carrier wave is identical with tdd frame structure type for the frame structure of reference TDD, all ascending time slot, protection interval, this type of descending time slot), the frame structure of channel reciprocity carrier wave wireless frame of Macro community and each Pico community of belonging to this Macro community together is all configured to ascending time slot, protects interval, descending time slot;
Macro community and belong to together this Macro community each Pico community channel reciprocity carrier wave wireless frame ascending time slot carrying content be uplink pilot signal SRS and ascending control information; Described ascending control information comprises down link ACK/NACK and uplink scheduling request;
Macro community and belong to together this Macro community each Pico community channel reciprocity carrier wave wireless frame descending time slot carrying content be Downlink Control Information; Described Downlink Control Information comprises down dispatch information, uplink scheduling is given and ul ack/NACK;
The allocation ratio of each cell uplink time slot and descending time slot length adjusts according to needing the bit number relative size of mutual ascending control information and Downlink Control Information to carry out in each community (method of adjustment is for modulating qualitatively);
Step 3, when the channel reciprocity carrier wave wireless frame of Macro community is in descending time slot, is polymerized with the descending carrier in corresponding Macro community; When the channel reciprocity carrier wave wireless frame of each Pico community belonging to this Macro community together is in descending time slot, be polymerized with the descending carrier in corresponding Pico community respectively;
Step 4, when the channel reciprocity carrier wave wireless frame of Macro community is in ascending time slot, is polymerized with the up-link carrier in corresponding Macro community; When the channel reciprocity carrier wave wireless frame of each Pico community belonging to this Macro community together is in ascending time slot, be polymerized with the up-link carrier in corresponding Pico community respectively.
With traditional by after the ascending control channel feedback quantization of up-link carrier with encode after the channel information of descending carrier compare, the main distinction of the present invention is with beneficial effect: by configuring the reciprocity carrier wave of Bu Tong frequency respectively for Macro community and each Pico community belonging to this Macro community together, the frame structure of reciprocity carrier wave wireless frame is configured to have ascending time slot, protection interval, the tdd frame structure of descending time slot, and in ascending time slot, carry uplink pilot signal SRS and ascending control information, bearing downlink control information in descending time slot, make the Gains resources expense of FDD system channel reciprocity less and more accurate simultaneously, also the mutual more accurate of ascending control information and Downlink Control Information in heterogeneous network is made.
Accompanying drawing explanation
Fig. 1 is heterogeneous network operative scenario figure;
Fig. 2 is existing fdd mode carrier aggregation schematic diagram;
Fig. 3 is carrier aggregation schematic diagram in the FDD heterogeneous network that proposes of the present invention;
Fig. 4 is the reciprocity carrier wave wireless frame frame structure allocation plan that the present invention proposes;
Fig. 5 is the descending interference scene graph of Macro community and Pico community in the embodiment of the present invention;
Fig. 6 is the uplink interference scene graph of Macro community and Pico community in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail, also describe technical problem and the beneficial effect of technical solution of the present invention solution simultaneously, it is pointed out that described embodiment is only intended to be convenient to the understanding of the present invention, and any restriction effect is not play to it.
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.The present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 3, be carrier aggregation schematic diagram in FDD heterogeneous network.The operable frequency resource of whole FDD heterogeneous network is: f1, f2, f31, f32, f4, f5.Wherein, the frequency resource of Macro community is configured to: f1, f2, f31, f4, f5, and wherein, f1 and f2 is descending carrier, f4 and f5 is up-link carrier, and f31 is channel reciprocity carrier wave; The frequency resource of Pico community is configured to: f1, f2, f32, f4, f5, and wherein, f1 and f2 is descending carrier, f4 and f5 is up-link carrier, and f32 is channel reciprocity carrier wave.It should be noted that f31 and f32 is different frequency carrier waves.
Use for reference the frame structure of TDD, the frame structure of reciprocity carrier wave (f31 or f32) radio frames is configured to ascending time slot, protection interval, descending time slot, it is specifically formed as shown in Figure 4.
When reciprocity carrier wave (f31 or f32) radio frames is descending time slot, be polymerized with the descending carrier (f1 and f2) in Macro and Pico community; When reciprocity carrier wave (f31 or f32) radio frames is ascending time slot, be polymerized with the up-link carrier (f4 and f5) in Macro and Pico community.
The ascending time slot carrying uplink pilot signal SRS of described channel reciprocity carrier wave and ascending control information, ascending control information comprises down link ACK/NACK and uplink scheduling request etc.; The control information of descending time slot bearing downlink, Downlink Control Information comprises down dispatch information, uplink scheduling imparting and ul ack/NACK etc.
Uplink pilot signal SRS is configured with in reciprocity carrier wave wireless frame ascending time slot, such base station receives this SRS, reciprocity carrier wave uplink channel information can be obtained, because frequency is identical, thus obtain the descending channel information of reciprocity carrier wave, thus the up-downgoing channel reciprocity of carrier wave can be obtained in FDD system.
Except uplink pilot signal SRS, be also configured with ascending control information in reciprocity carrier wave wireless frame ascending time slot, be configured with Downlink Control Information in descending time slot, therefore can be realized the information interaction of ascending control information and Downlink Control Information by reciprocity carrier wave.
It should be noted that, reciprocity carrier wave wireless frame of the present invention is not limited to 10ms, reciprocity carrier wave wireless frame slot is not limited to 1ms, and ascending time slot can adjust according to the bit number relative size of user side ascending control information and base station end Downlink Control Information in FDD heterogeneous network than arranging flexibly with the configuration of descending time slot.
The beneficial effect that the present embodiment scheme is brought:
In heterogeneous network, between Macro community and Pico community, there is comparatively serious mutual interference, cause the probability of ascending control information and Downlink Control Information error of transmission to strengthen, had a strong impact on systematic function.The method that the present embodiment provides make the Gains resources expense of FDD system channel reciprocity less and more accurate simultaneously, also make the more accurate alternately of ascending control information and Downlink Control Information in heterogeneous network.
The present invention uses for reference the frame structure of TDD, the frame structure of reciprocity carrier wave (f31 or f32) radio frames is configured to ascending time slot, protection interval, descending time slot.
In existing FDD system, by the channel information of the descending carrier after the ascending control channel feedback quantization of up-link carrier and after coding, but the expense of the control signal adopting this scheme to produce is larger, UE side obtains downlink channel condition information by channel estimating, there is channel estimation errors; BS side only can obtain the descending channel information after quantification, there is quantization error; And also can error of transmission be there is when feedback transmission in the CSI quantized.
By collocating uplink pilot signal SRS in reciprocity carrier wave f31 and f32 radio frames ascending time slot, base station can obtain reciprocity carrier wave uplink channel information, because frequency is identical, thus obtains the descending channel information of reciprocity carrier wave.The feature that the method for the acquisition FDD system channel reciprocity that the present embodiment provides utilizes frequency identical, under limited time overhead, obtains complete and accurate descending channel information in the easy mode of one.
When downlink transfer is all carried out in Macro community and Pico community, as Fig. 5, Macro UE can be subject to the strong jamming of Pico base station, but do not use f31 carrier wave due to Pico base station, therefore Macro UE is disturbed less at f31 frequency.Due to the descending time slot bearing downlink control information of f31 reciprocity carrier wave, the Macro that therefore Macro UE receives holds the accuracy of Downlink Control Information to be improved.
When uplink is all carried out in Macro community and Pico community, as Fig. 6, Macro UE can produce strong jamming to Pico base station, but do not use f32 carrier wave due to Macro community, therefore Pico base station is disturbed less at f32 frequency.Due to the ascending time slot carrying ascending control information of f32 reciprocity carrier wave, the Pico UE that therefore Pico base station receives holds the accuracy of ascending control information to be improved.
Analyzed as can be seen from above, Macro community and Pico community are by using different reciprocity carrier wave f31 and f32 frequently, reduce the interference suffered by reciprocity carrier wave f31 and f32 in Macro community and Pico community, improve the correctness of channel estimating, make the mutual more accurate of ascending control information and Downlink Control Information.
With traditional by after the ascending control channel feedback quantization of up-link carrier with encode after the channel information of descending carrier compare, the main distinction of the present embodiment is with effect: by configuring reciprocity carrier wave f31 and f32 of Bu Tong frequency respectively for Macro community and Pico community, the frame structure of f31 and f32 is configured to have ascending time slot, protection interval, the tdd frame structure of descending time slot, and in ascending time slot, carry uplink pilot signal SRS and ascending control information, bearing downlink control information in descending time slot, make the Gains resources expense of FDD system channel reciprocity less and more accurate simultaneously, also the mutual more accurate of ascending control information and Downlink Control Information in heterogeneous network is made.
The present embodiment is applicable to FDD heterogeneous network scene, benefits to the performance promoting FDD heterogeneous network.
The above; be only the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any people being familiar with this technology is in the technical scope disclosed by the present invention; the conversion and replacement expected can be understood; all should be encompassed in and of the present inventionly comprise within scope, therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (3)
- Obtain channel reciprocity in 1.FDD heterogeneous network and the method for interactive control information, wherein Macro community refers to the macrocell in heterogeneous network, and the Microcell of Pico community finger low-power node, is characterized in that, comprise following steps:Step 1 be Macro community and each Pico community configurating channel reciprocity carrier wave respectively belonging to this Macro community together, and the channel reciprocity carrier wave that Macro community and each Pico community belonging to this Macro community together adopt each other Bu Tong frequently; The channel reciprocity carrier wave that each Pico community adopts is with frequently;Step 2, is all configured to ascending time slot, protection interval, descending time slot by the frame structure of channel reciprocity carrier wave wireless frame of Macro community and each Pico community of belonging to this Macro community together;Macro community and belong to together this Macro community each Pico community channel reciprocity carrier wave wireless frame ascending time slot carrying content be uplink pilot signal SRS and ascending control information;Macro community and belong to together this Macro community each Pico community channel reciprocity carrier wave wireless frame descending time slot carrying content be Downlink Control Information;The allocation ratio of each cell uplink time slot and descending time slot length adjusts according to needing the bit number relative size of mutual ascending control information and Downlink Control Information in each community;Step 3, when the channel reciprocity carrier wave wireless frame of Macro community is in descending time slot, is polymerized with the descending carrier in corresponding Macro community; When the channel reciprocity carrier wave wireless frame of each Pico community belonging to this Macro community together is in descending time slot, be polymerized with the descending carrier in corresponding Pico community respectively;Step 4, when the channel reciprocity carrier wave wireless frame of Macro community is in ascending time slot, is polymerized with the up-link carrier in corresponding Macro community; When the channel reciprocity carrier wave wireless frame of each Pico community belonging to this Macro community together is in ascending time slot, be polymerized with the up-link carrier in corresponding Pico community respectively.
- 2. obtain channel reciprocity and the method for interactive control information in FDD heterogeneous network according to claim 1, it is characterized in that, ascending control information described in step 2 comprises down link ACK/NACK and uplink scheduling request.
- 3. obtain channel reciprocity and the method for interactive control information in FDD heterogeneous network according to claim 1, it is characterized in that, Downlink Control Information described in step 2 comprises down dispatch information, uplink scheduling is given and ul ack/NACK.
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| CN103701737B (en) * | 2014-01-17 | 2017-02-08 | 北京工业大学 | Interference cancellation method for communication of cloud wireless access network |
| CN103873418B (en) * | 2014-03-21 | 2017-04-19 | 西安电子科技大学 | Full-duplex orthogonal frequency division communication method for large-scale antenna system |
| CN106576367B (en) * | 2014-08-26 | 2020-02-14 | 华为技术有限公司 | Wireless communication method, device and system |
| CN107371266B (en) | 2016-05-13 | 2022-08-23 | 中兴通讯股份有限公司 | Configuration method and device of data transmission structure |
| WO2021035595A1 (en) * | 2019-08-29 | 2021-03-04 | Qualcomm Incorporated | Configuring guard intervals for multiple uplink carriers |
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| CN101754230A (en) * | 2008-12-17 | 2010-06-23 | 华为技术有限公司 | Carrier polymerizing method in FDD system and device thereof |
| CN102149100A (en) * | 2011-04-25 | 2011-08-10 | 东南大学 | Method for strengthening interference coordination in layered heterogeneous network of mobile communication system |
| WO2012108805A1 (en) * | 2011-02-09 | 2012-08-16 | Telefonaktiebolaget L M Ericsson (Publ) | Efficient use of reference symbol resources in a hierarchical heterogeneous cell deployment |
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| WO2012108806A1 (en) * | 2011-02-09 | 2012-08-16 | Telefonaktiebolaget L M Ericsson (Publ) | Distribution of cell-common downlink signals in a hierarchical heterogeneous cell deployment |
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| CN101754230A (en) * | 2008-12-17 | 2010-06-23 | 华为技术有限公司 | Carrier polymerizing method in FDD system and device thereof |
| WO2012108805A1 (en) * | 2011-02-09 | 2012-08-16 | Telefonaktiebolaget L M Ericsson (Publ) | Efficient use of reference symbol resources in a hierarchical heterogeneous cell deployment |
| CN102149100A (en) * | 2011-04-25 | 2011-08-10 | 东南大学 | Method for strengthening interference coordination in layered heterogeneous network of mobile communication system |
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