CN104683270A - Channel frequency offset estimating method for LTE small base station cell merge - Google Patents
Channel frequency offset estimating method for LTE small base station cell merge Download PDFInfo
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- CN104683270A CN104683270A CN201510096557.4A CN201510096557A CN104683270A CN 104683270 A CN104683270 A CN 104683270A CN 201510096557 A CN201510096557 A CN 201510096557A CN 104683270 A CN104683270 A CN 104683270A
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Abstract
The invention discloses a channel frequency offset estimating method for LTE small base station cell merge. Each RRU (Remote Radio Unit) tracks frequency offset with proper reference signal density through SRS (Sounding Reference Signal) channel processing and PUSCH (Physical Uplink Shared Channel) processing. The method is used for estimating the antenna data frequency offset and merging the antenna data when small base station cells are merged; the failure of frequency offset tracking is avoided.
Description
Technical field
The present invention relates to the little base station cell of LTE and merge channel frequency deviation estimating method.
Background technology
At present, more and more higher to the requirement of wireless system performance.The new features of many radio communications are achieved under 3GPP LTE-A standard.Little base station have also been obtained and applies widely under LTE-A standard card cage.In little base station applies, cell combining technology obtains attention.This technology can realize the multiple long-distance radio frequency unit of same cell aggregation (RRU).Under this framework, in the scope that multiple RRU covers, mobile phone terminal is in same logic district, decreases the probability of switching, expands the coverage of the little base station of LTE.
In cell combining realizes, frequency deviation estimates it is an important content in channel estimating.The signal of terminal transmission is characterized by different frequency deviation values for different RRU.In general, the antenna data that multiple RRU receives should merge, for the decoding of upstream data.But, when cell combining, the frequency shift (FS) that different RRU antenna datas is corresponding different, the poor-performing directly merged.With the cell combining system of two RRU as an example: if when terminal is in two RRU coverage median points, and when moving with certain speed, the data frequency offset direction of two RRU receptions is contrary.If both system estimation results directly merged, frequency offset estimate f is approximately zero.
Current solution is not for carry out antenna data merging, and the good RRU data of Signal to Interference plus Noise Ratio (SINR) only choosing estimation carry out upper row decoding.The diversity gain that when this kind of scheme fails to utilize cell combining, many RRU antenna data brings.Another problem of the program is that the density of reference signal is limited for the tracking degree of frequency shift (FS), if follow the tracks of unsuccessfully, upstream data will continue decoding error, cause terminal to rebuild.
Summary of the invention
The little base station cell of a kind of LTE is the object of the present invention is to provide to merge channel frequency deviation estimating method, when merging for little base station cell, the estimation of many RRU antenna data frequency shift (FS) and merging, and the failure avoiding frequency shift (FS) to follow the tracks of.
For achieving the above object, technical scheme of the present invention is that the little base station cell of a kind of LTE of design merges channel frequency deviation estimating method, based on two upstream physical layer Channel Processing, i.e. detection reference signal Sounding Reference Signal (SRS) and upstream physical layer shared channel Physical Uplink Shared Channel (PUSCH), by SRS Channel Processing and PUSCH Channel Processing, each RRU is offset with suitable reference signal density tracking frequency;
Described SRS Channel Processing comprises detection and the initial frequency deviation estimation setting of cell combining RRU: collected on each RRU by the SRS energy of terminal transmission, and the energy obtained by each RRU and pre-determined threshold compare separately; Select energy to be greater than the RRU of pre-determined threshold, its antenna data is masked as effectively, participate in merging, if this RRU antenna data is flagged as effectively first time, initial frequency drift is arranged to it; Record the uplink scheduling density of terminal again, if this density is lower than threshold value, allow base station triggers forced ascending dispatch, the density that frequency shift (FS) is followed the tracks of reaches requirement;
Described PUSCH Channel Processing comprises estimation and the compensation of frequency shift (FS): PUSCH decoding is only relied in SRS process and is flagged as effective RRU antenna data; And the frequency shift (FS) of each RRU antenna data and compensation are independently carried out; Make each RRU antenna data correspondence independently long run frequency skew filter value; The equilibrium of PUSCH data is based on the frequency offset estimate f of different RRUs.
Advantage of the present invention and beneficial effect are: provide the little base station cell of a kind of LTE to merge channel frequency deviation estimating method, when merging for little base station cell, and the estimation of many RRU antenna data frequency shift (FS) and merging, and the failure avoiding frequency shift (FS) to follow the tracks of.
Compare with existing technical scheme, this programme can the holding frequency skew stability of following the tracks of, and can obtain upstream data decoding because the 3dB diversity gain that brings of cell combining.
Accompanying drawing explanation
Fig. 1 is the flow chart of SRS Channel Processing of the present invention;
Fig. 2 is the flow chart of PUSCH Channel Processing of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
The invention provides the little base station cell of a kind of LTE and merge channel frequency deviation estimating method, based on two upstream physical layer Channel Processing, i.e. detection reference signal Sounding Reference Signal (SRS) and upstream physical layer shared channel Physical Uplink Shared Channel (PUSCH), by SRS Channel Processing and PUSCH Channel Processing, each RRU is offset with suitable reference signal density tracking frequency;
Described SRS Channel Processing comprises detection and the initial frequency deviation estimation setting of cell combining RRU: collected on each RRU by the SRS energy of terminal transmission, and the energy obtained by each RRU and pre-determined threshold compare separately; Select energy to be greater than the RRU of pre-determined threshold, its antenna data is masked as effectively, participate in merging, if this RRU antenna data is flagged as effectively first time, initial frequency drift is arranged to it; Record the uplink scheduling density of terminal again, if this density is lower than threshold value, allow base station triggers forced ascending dispatch, the density that frequency shift (FS) is followed the tracks of reaches requirement;
Described PUSCH Channel Processing comprises estimation and the compensation of frequency shift (FS): PUSCH decoding is only relied in SRS process and is flagged as effective RRU antenna data; And the frequency shift (FS) of each RRU antenna data and compensation are independently carried out; Make each RRU antenna data correspondence independently long run frequency skew filter value; The equilibrium of PUSCH data is based on the frequency offset estimate f of different RRUs.
The technical scheme that the present invention specifically implements is:
As terminal transmission Sounding Reference Signal SRS, the SRS energy that each RRU antenna receives is detected by time domain window.
The full bandwidth energy of each RRU is added.The energy meeting that each RRU obtains and a thresholding compare.
If be greater than thresholding, this RRU will be flagged as effectively, participates in cell combining antenna data.
This RRU history effective marker is queried.If be not flagged as effectively, then configure initial frequency drift.
Uplink scheduling density can be queried.If present terminal did not have uplink scheduling in last sense cycle, then produce a compulsory uplink scheduling.
PUSCH frequency shift (FS) operation can be carried out in units of each RRU antenna data.
The resource block size of PUSCH scheduling can be queried.If be less than thresholding, do not carry out frequency offset detection.
If be effective RRU antenna data and resource block size is greater than thresholding, Frequency offset estimation is carried out in short-term.
Based on frequency offset estimate f when Frequency offset estimation upgrades long in short-term.
The flow chart of SRS Channel Processing of the present invention as shown in Figure 1;
The flow chart of PUSCH Channel Processing of the present invention as shown in Figure 2.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
- The little base station cell of 1.LTE merges channel frequency deviation estimating method, it is characterized in that, by SRS Channel Processing and PUSCH Channel Processing, each RRU is offset with suitable reference signal density tracking frequency;Described SRS Channel Processing comprises detection and the initial frequency deviation estimation setting of cell combining RRU: collected on each RRU by the SRS energy of terminal transmission, and the energy obtained by each RRU and pre-determined threshold compare separately; Select energy to be greater than the RRU of pre-determined threshold, its antenna data is masked as effectively, participate in merging, if this RRU antenna data is flagged as effectively first time, initial frequency drift is arranged to it; Record the uplink scheduling density of terminal again, if this density is lower than threshold value, allow base station triggers forced ascending dispatch, the density that frequency shift (FS) is followed the tracks of reaches requirement;Described PUSCH Channel Processing comprises estimation and the compensation of frequency shift (FS): PUSCH decoding is only relied in SRS process and is flagged as effective RRU antenna data; And the frequency shift (FS) of each RRU antenna data and compensation are independently carried out; Make each RRU antenna data correspondence independently long run frequency skew filter value; The equilibrium of PUSCH data is based on the frequency offset estimate f of different RRUs.
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| CN106428117A (en) * | 2016-10-17 | 2017-02-22 | 北京交通大学 | Wireless communication coverage method for rail transportation train |
| US10715217B2 (en) | 2017-02-07 | 2020-07-14 | Datang Mobile Communications Equipment Co., Ltd. | Downlink signal pre-correction method and device |
| CN113872629A (en) * | 2020-06-12 | 2021-12-31 | 华为技术有限公司 | Information transmission method, device and storage medium |
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| CN113872629B (en) * | 2020-06-12 | 2023-04-18 | 华为技术有限公司 | Information transmission method, device and storage medium |
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Application publication date: 20150603 |