CN106792949B - A kind of LTE-Hi cell discovery method based on macro base station reference signal TOA estimation - Google Patents
A kind of LTE-Hi cell discovery method based on macro base station reference signal TOA estimation Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/04—Reselecting a cell layer in multi-layered cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
- H04W16/20—Network planning tools for indoor coverage or short range network deployment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention relates to a kind of LTE-Hi cells based on macro base station reference signal TOA estimation to find method, belongs to mobile communication technology field.This method carries out compartmentalization processing to the geographic area of cell coverage area small in network, and the adjacent domain of each cell is divided into multiple regional areas, and is not overlapped between each regional area.UE is carried out with TsFor the TOA estimation in period and relevant treatment, final goal is fingerprint corresponding with some regional area to be found in TOA fingerprint database, and thus triggering UE carries out the operation of IFS cell discovery.The present invention program can control the IFS alien frequencies detection zone of UE in the range of a very little, except UE is in this range or when it is only quickly through this region, TOA fingerprint can not generate matching to motivate the IFS movement for causing UE, thus the invalid IFS alien frequencies detection number of UE is reduced and evaded in large quantities, to preferably solve the problems, such as energy consumption efficiency of the UE when carrying out cell discovery.
Description
Technical field
The invention belongs to mobile communication technology fields, are related to a kind of LTE-Hi based on macro base station reference signal TOA estimation
Cell finds method.
Background technique
In recent years, wireless data traffic rapid development, and the overwhelming majority occurs indoors and hot zones.However, at present
Mobile communication system provide service mainly for macro covering scene, indoor and hot zones user need cannot be met well
It asks.For the further demand of hot spot and in-door covering, 3GPP proposes cell enhancing (small in Release-12
Cell enhancement, SCE) solution, particularly, slight area's indoor scene therein and hot spot scene are and current
Industry hot research technology LTE-Hi design scenario, technical solution in terms of it is closely related, the two is direct
Emphasis carries out the scene and target of service coverage towards hot spot region and room area.
Other than relative to the coverage area difference of macrocell (macro cell), small-cell base station typically refers to volume
Small, light-weight, transmission power is low and support the base station of less carrier number, it can make up macrocell covering (such as hot spot
Area and the deployment of indoor depth) deficiency.In outdoor hot zones, cell can provide load bridging (data for macrocell
Offloading), alleviate the service traffics pressure of macrocell.Also, cell can also polymerize with carrier wave, LTE-U is (unauthorized
Frequency range LTE system) etc. new technologies combine, improve network throughput by increasing access bandwidth.However, small-cell base station
Deployment also brings complicated heterogeneous network interference control and eliminates, complicated user access control other than bringing above-mentioned advantage
Management and small-cell base station between multi-hop synchronisation requirement the problems such as.In addition, cell is not only for LTE-Hi system
It supports the deployment in macrocell coverage area, also to support the independent deployment not in the coverage area of macrocell, such as
Deep indoor scene.It is worth noting that the maximum difference of the indoor and outdoor deployment of LTE-Hi cell is user equipment
The mobility of (User Equipment, UE).In indoor scene, it is mobile that UE generally remains static or low speed, and in outdoor scene
Middle UE may then have the faster UE of relative moving speed.
The small cell deployment of LTE-Hi system is generally more intensive, and the coverage area of single cell is small, and UE need to be from numerous
It is found in cell and filters out the cell for being most suitable for oneself and carrying out service connection, is i.e. UE is realized by cell discovery technique
From the process for being transformed into and communicating with small-cell base station is communicated with macro base station, business is diverted to cell from macrocell to reach
Purpose.Currently, the cell discovery mechanism in LTE system is to utilize primary synchronization signal (Primary Synchronization
Signal, PSS), secondary synchronization signal (Secondary Synchronization Signal, SSS) and cell specific reference
The detection of signal (Cell-specific Reference Signal, CRS) is realized.For LTE-Hi system, in order to allow UE
Traditional LTE cell discovery mechanism can be used in the presence for detecting and finding LTE-Hi cell, i.e. UE is in LTE-Hi cell
The PSS/SSS/CRS signal that small-cell base station issues is searched on the working frequency range of base station, to complete cell discovery.Due to
The working frequency range of LTE-Hi small-cell base station is in 3.5GHz, so the discovery procedure of its cell is in the work different from macro base station
Make to carry out in frequency range, but discovery mechanism and process flow are completely the same.Relative to traditional LTE cell discovery procedure, LTE-
Hi cell discovery procedure is that one kind carries out scanning (inter- between frequency between macro base station and small-cell base station working frequency range
Frequency scanning, IFS) process, therefore, IFS also just become LTE-Hi cell discovery core procedure and pass
Key problem.It is worth noting that for the ease of difference UE on different frequency bands IFS operation, here with frequency detection (or with frequency
Scanning) refer to UE for macro cell base station signal measurement detect, and with alien frequencies detection (or different frequency scanning) refer to UE for
The measurement of LTE-Hi small-cell base station signal detects.
The main problem that LTE-Hi cell discovery technique is faced is: (1) UE is carrying out the small cell discovery based on IFS
When, consumed energy (or power) can increase because of the increase of surveyed carrier number.(2) increasing with cell,
When carrying out cell IFS search, needing to carry out alien frequencies detection a large amount of, under the fixed cycle, (" alien frequencies " here refers in particular to UE
With the different LTE-Hi cell frequency range of macro base station frequency range).Under many actual conditions, some IFS operations are for UE
It is unnecessary, such as when UE is only to quickly move through small cell coverage area, even if UE has found the presence of cell,
Since it is in the of short duration residence time of the cell, UE will not be by service distributing to small cell.In this case IFS is past
Toward the big energy that can waste UE.In addition, if UE is in except the small cell coverage area of LTE-Hi, IFS repeatedly is grasped at this time
Make to be even more unhelpful, wastes the power consumption of UE.(3) UE is during carrying out IFS, it is also possible to by multiple small in cell cluster
The influence of severe jamming between the cell base station discovery signal transmitted and reference signal.In conclusion the discovery of cell
Mechanism and technical solution, the main starting point, which is that, solves the problems, such as above-mentioned three, wherein the target of core first is that from UE
Efficiency (energy efficiency) angle is set out, and realizes UE to the quick of cell with lower energy penalty as much as possible
Effectively discovery, using cell and to realize service distributing.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of cell discovery sides based on macro base station signal TOA estimation
Method.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of LTE-Hi cell discovery method based on macro base station signal TOA estimation, comprising the following steps:
1) geographic area in macrocell network coverage area is planned in advance, i.e., is distributed according to the deployment of cell
The adjacent domain of each cell is divided into multiple regional areas by situation, and is not overlapped between each regional area；
2) multiple UE are distributed to each regional area by network system, the UE in each regional area is in its regional location
It obtains from neighbouring macro base station signal, and measures corresponding TOA data group, then report network system or progress are locally deposited
Storage, forms initial TOA fingerprint database；
3) UE cyclically carries out the TOA estimation of macro-cell signals as unit of cycle T s, if looking in TOA fingerprint database
It is then entered step 4) to the fingerprint to match with some regional area, the arrival for otherwise waiting for next cycle re-starts
Matching operation；
4) flag byte SCStatusFlag is added in every TOA fingerprint for recording corresponding cell work at present
State has matched the flag byte in fingerprint by network system inspection, if SCStatusFlag is labeled as Active or Idle shape
State then triggers UE and carries out the discovery of IFS cell；Otherwise return step 3)；
5) UE carries out IFS operation on cell working frequency range, if correctly having found some small cell in the process
Presence, then gravity treatment and the cell is resident or by ongoing macro base station service switching to the cell, with regard to this completion
The operation of cell discovery.
Further, after completing primary cell discovery, fingerprint database successfully carries out cell discovery according to this time
TOA estimated value carries out data smoothing update processing to TOA finger print data corresponding in fingerprint database.
Further, when UE is in the scene gradually left current service cell and can not be switched to other cells
When, UE return step 3), restart new cell discovery operation.
Further, flag byte UEStatusFlag is added in every TOA fingerprint for judging UE moving condition, UE
Current movement speed critical value are as follows: vmax=2ri/ Ts will not trigger the IFS operation of UE, wherein r when more than the critical valueiFor
The reference signal TOA measurement error control parameter of i-th of regional area in network.
Further, the fingerprint to match described in step 3) refers in the TOA estimated value that UE is reported and database certain
The TOA numerical value mean square error δ that fingerprint is included meets preset range, i.e.-β < δ < β, β=10log [(R+r)/(R-r)]+η,
Wherein R is small coverage radius of cell, and r is defined as the limit of error of reference signal measurements of arrival time, and η is error transfer factor parameter.
Further, UE should carry out after powering once without fingerprint matching triggering pressure IFS operation, then again into
Enter the operation under TOA fingerprint matching scheme.
Further, it after UE is resident or is switched to newfound cell, can be carried out using two methods macro small
Gravity treatment or switching between Qu Yu little cell:
1) UE carries out finger print data acquisition as the period using Ts and matching is searched for, if UE can not find matched cell,
It needs to retract macrocell and obtains access link；If the matching fingerprint that UE is found is consistent with current cell fingerprint, UE is protected
It holds and resides in current cell；If the matching fingerprint that UE is found is from new cell, UE needs gravity treatment or is switched to
New cell；
2) UE uses the s-Measure measurement mechanism of LTE system on cell working frequency range, if UE monitors to service
The signal strength of cell starts to weaken and has the tendency that switching back to macrocell, then can be with return step 3), restart small cell
It was found that operation, so that UE prepares gravity treatment or switches back into macrocell.
The beneficial effects of the present invention are: compared with traditional LTE cell finds scheme, the present invention program can be by UE's
IFS alien frequencies detection zone control in the range of a very little (range should and can be determined as being in by network unlatching or
The small cell coverage area of certain of person's idle state), except UE is in this range or when it is only quickly through this region,
TOA fingerprint can not generate matching to motivate the IFS movement for causing UE, thus reduce and evade the invalid IFS alien frequencies of UE in large quantities
Number is detected, to preferably solve the problems, such as energy consumption efficiency of the UE when carrying out cell discovery.In addition, relative to traditional base
It is proposed by the present invention to be based in macrocell/situation of the cell detection scheme vulnerable to noise and interference effect of RSSI/RSRP measurement
The design of TOA fingerprint and the matched IFS scheme of search, can further improve the validity and reliability of cell discovery.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is signaling process figure of the invention；
Fig. 2 is step flow chart of the invention；
Fig. 3 is TOA fingerprint matching Accuracy Controlling Parameter figure of the invention.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
Fig. 1 is signaling process figure of the invention, and implementer's case of the invention is based on multiple macro cell base stations with reference to letter
Number the characteristic that has differences of UE for being located at diverse geographic location is reached, network area can be subjected to compartmentalization (or gridding)
Processing, propose by macro base station time of arrival (toa) estimation based on, construct TOA fingerprint database, to geographical location locating for UE into
Row fingerprint matching search and positioning assessment, whether there is the cell that may have service distributing ability to determine around UE, from
And finally realize the purpose of LTE-Hi system cell discovery.
Specifically, the expansion of the present invention program is implemented to include three primary condition and seven key steps set forth below:
Primary condition 1: the geographic area in macrocell network coverage area planned in advance, and according to the portion of cell
Administration's distribution situation is divided into M regional area, and (each regional area can be considered a geography network near some small-cell base station
Lattice, size can be arranged according to the reasonable complexity and small cell coverage area identification precision that system or network are supported).
Primary condition 2: being specified by system or distributed multiple UE, each regional area delimited in primary condition 1 in advance
Interior progress TOA initialization survey estimation.UE in each regional area can get in its regional location from N number of nearby
Macro base station signal, and measure corresponding TOA data group, then report network system.
Primary condition 3: the finger print data that network system is reported according to UE is collected in primary condition 2, according in primary condition 1
Corresponding M regional area division, forms initial TOA fingerprint database, the fingerprint database can be stored in network-side or
Person is directly issued to each UE and carries out remote storage.The specific composition of TOA fingerprint database as shown in Table 1, in database in total
Comprising M fingerprint, each finger print data is by the TOA estimated value from N number of macro cell base station signal, corresponding N number of macrocell ID
And 2 flag byte (SCStatusFlag, UEStatusFlag) compositions.Particularly, consider that the working condition of cell can
It can be dynamic, it is possible in unlatching (Active), idle (Idle) or states such as (Closed) are closed, in each fingerprint
1 flag byte SCStatusFlag have recorded the current working status of the corresponding cell of TOA fingerprint.Consider UE in net
Moving condition in network can be divided into static (Stationary), low speed (Low Speed), middling speed (Middle Speed) and height
Fast (High Speed) etc., also increases 1 flag byte UEStatusFlag, the related moving condition as UE in fingerprint
Judgement record.
1 macro base station signal TOA fingerprint database of table
Fig. 2 is step flow chart of the invention, mainly includes following seven steps referring to Fig. 2 present invention.
Step 1: assuming that the target UE for needing to carry out cell discovery is in some area in macrocell network coverage area
Domain, then target UE can be received in the area from neighbouring multiple macro cell base station signals.Attempt to carry out cell in UE
It was found that IFS operation before, UE first cyclically carried out as unit of cycle T s macro-cell signals TOA estimation.
Step 2: target UE, can be therefrom by measuring and handling the reference signal from multiple macro cell base stations around
Find the strongest macro base station reference signal of N number of signal and thus to obtain the cell ID of each corresponding macrocell.Believe in the reception of UE
In number, sliding related operation is carried out by the local signal generated with UE, and searches for the position of correlation peak appearance, UE can estimate
Count out the TOA numerical value that N number of macro-cell signals reach UE.On the basis of this N number of TOA estimated data, UE is combined into one
TOA finger print data group, and report network (or being locally stored).
Step 3: being reported to the TOA finger print data of network, carries out one by one with each TOA fingerprint in TOA fingerprint database
Matching search, matches (i.e. and if only if certain TOA fingerprint in the TOA finger print data and TOA fingerprint database (being shown in Table 1)
The mean square error δ of TOA numerical value included in certain fingerprint is in a preset model in the TOA estimated value and database that UE is reported
In enclosing, i.e.-β < δ < β, and macrocell ID contained by this fingerprint is strictly one by one in the UE N number of macrocell ID and database that report
It is corresponding) when, i.e., it is believed that having found matched TOA fingerprint.β=10log [(R+r)/(R-r)]+η, wherein R is small MPS process
Radius, r are defined as the limit of error of reference signal measurements of arrival time, and η is error transfer factor parameter.About TOA fingerprint matching essence
The understanding of degree control parameter is referred to Fig. 3.If UE locally has fingerprint database, the fingerprint matching search behaviour of this step
Make just to complete at the end UE.If the condition of this step is unsatisfactory for, i.e. UE does not find matched fingerprint, then the operation of UE returns to step
Rapid one, and wait next TsAfter the arrival in period, then the operation new at the beginning from step.
Step 4: it under conditions of having determined fingerprint matching in step 3, has been matched in fingerprint by network system inspection
Two flag bytes.If SCStatusFlag is labeled as " Active/Idle " state, it is believed that UE carries out the base of IFS
This condition is fully met, and system starts to carry out the cell signal detection based on IFS for UE is triggered.If the condition of this step is not
Meet, then the operation return step one of UE, and waits next TsAfter period arrives, then the operation new at the beginning from step.
Step 5: UE carries out IFS operation on cell working frequency range, if correctly having found some in the process
The presence of cell then gravity treatment and is resident the cell or by ongoing macro base station service switching to the cell, just
This completes the operation of cell discovery.Fingerprint database successfully carries out the TOA estimated value of cell discovery according to this, to fingerprint
Corresponding TOA finger print data carries out data smoothing update processing in database, to improve the essence of TOA numerical value in fingerprint database
Exactness.
Step 6: it is resident or after being switched to newfound cell in UE, can be carried out using two kinds of mechanism macrocells/
Gravity treatment or switching between cell:
Mechanism one, UE can continue to use the discovery scheme of the cell based on TOA fingerprint database, still carry out by the period of Ts
Finger print data obtains and matching search.If in the process, UE can not find matched cell, then needs to retract macrocell and obtain
Access is taken to link；If the matching TOA fingerprint that UE is found is consistent with current cell fingerprint, UE holding resides in current small
Cell；If the matching fingerprint that UE is found is from new cell, UE needs gravity treatment or is switched to new small cell.
Mechanism two, UE can also not use the TOA fingerprint matching scheme based on macro-cell signals to carry out remaining slight
The operation of area's gravity treatment or switching, but the s-Measure measurement mechanism of LTE system is used on cell working frequency range.Such as
Fruit UE monitors that the signal strength for servicing cell starts to weaken and has the tendency that switching back to macrocell, then can be with return step
One, the cell discovery scheme based on TOA fingerprint database mechanism is restarted, so that UE prepares gravity treatment or switches back into macro small
Area.
It is worth noting that the UE in the case of mechanism 1 needs to keep the alien frequencies dual link with macro base station and cell, but ring
It answers speed fast, is suitble to UE between the static mobility scene between low-medium speed；And mechanism 2 need to keep and macro base station or small
The single connection of cell, static compared with suitable UE or low speed movement scene.
Step 7: when UE, which is in, gradually to be left current service cell and can not be switched to the scene of other cells,
UE needs return step one, restarts new cell discovery operation.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (7)
1. a kind of LTE-Hi cell based on macro base station reference signal TOA estimation finds method, it is characterised in that: including following
Step:
1) geographic area in macrocell network coverage area is planned in advance, i.e., according to the deployment distribution situation of cell
The adjacent domain of each cell is divided into multiple regional areas, and is not overlapped between each regional area；
2) multiple UE are distributed to each regional area by network system, the UE in each regional area is obtained in its regional location
From neighbouring macro base station signal, and corresponding TOA data group is measured, then report network system or is locally stored, shape
At initial TOA fingerprint database；
3) the target UE for needing to carry out cell discovery cyclically carries out the TOA estimation of macro-cell signals as unit of cycle T s,
It enters step if finding the fingerprint to match with some regional area in TOA fingerprint database 4), otherwise waits for down
The arrival of a cycle re-starts matching operation；
Step 3) is specifically includes the following steps: step 1: assuming that the target UE for needing to carry out cell discovery is in macrocell net
Some region in network coverage area, then target UE can be received in the area from neighbouring multiple macro cell base stations letter
Number, before target UE attempts to carry out the IFS operation of cell discovery, target UE is first cyclically carried out as unit of cycle T s macro
The TOA of cell signal estimates；
Step 2: target UE can therefrom find N by measuring and handling the reference signal from multiple macro cell base stations around
The strongest macro base station reference signal of a signal and thus to obtain the cell ID of each corresponding macrocell, in the reception signal of target UE
In, sliding related operation is carried out by the local signal generated with target UE, and search for the position of correlation peak appearance, target UE
The TOA numerical value that N number of macro-cell signals reach target UE can be estimated；On the basis of this N number of TOA estimated data, target
UE is combined into a TOA finger print data group, and report network, or is being locally stored；
4) flag byte SCStatusFlag is added in every TOA fingerprint for recording corresponding cell work at present shape
State has matched the flag byte in fingerprint by network system inspection, if SCStatusFlag is labeled as Active or Idle state,
It then triggers target UE and carries out scanning IFS cell discovery between frequency；Otherwise return step 3)；
5) target UE carries out IFS operation on cell working frequency range, if correctly having found some small cell in the process
Presence, then gravity treatment and the cell is resident or by ongoing macro base station service switching to the cell, with regard to this completion
The operation of cell discovery.
2. a kind of LTE-Hi cell based on macro base station reference signal TOA estimation according to claim 1 finds method,
It is characterized by: fingerprint database successfully carries out the TOA estimation of cell discovery according to this time after completing primary cell discovery
Value carries out data smoothing update processing to TOA finger print data corresponding in fingerprint database.
3. a kind of LTE-Hi cell based on macro base station reference signal TOA estimation according to claim 1 finds method,
It is characterized by: gradually leaving current service cell when the target UE for needing to carry out cell discovery is in and can not be switched to
When the scene of other cells, target UE return step 3), restart new cell discovery operation.
4. a kind of LTE-Hi cell based on macro base station reference signal TOA estimation according to claim 1 finds method,
It needs to carry out cell discovery for judging it is characterized by: adding flag byte UEStatusFlag in every TOA fingerprint
Target UE moving condition, the current movement speed critical value of target UE are as follows: vmax=2ri/ Ts, will not when being more than the critical value
The IFS operation of target UE is triggered, wherein riFor the reference signal TOA measurement error control parameter of i-th of regional area in network.
5. a kind of LTE-Hi cell based on macro base station reference signal TOA estimation according to claim 1 finds method,
It is characterized by: the TOA that the fingerprint to match described in step 3) refers to that the target UE for needing to carry out cell discovery is reported estimates
The TOA numerical value mean square error δ that certain fingerprint is included in evaluation and database meets preset range, i.e. and-β < δ < β, β=
10log [(R+r)/(R-r)]+η, wherein R is small coverage radius of cell, and r is defined as the error of reference signal measurements of arrival time
Limit, η are error transfer factor parameter.
6. a kind of LTE-Hi cell based on macro base station reference signal TOA estimation according to claim 1 finds method,
It is characterized by: the target UE for needing to carry out cell discovery should be carried out once after powering without the strong of fingerprint matching triggering
IFS operation processed, then enters back into the operation under TOA fingerprint matching scheme.
7. a kind of LTE-Hi cell based on macro base station reference signal TOA estimation according to claim 1 finds method,
It is characterized by: after the target UE for needing to carry out cell discovery is resident or is switched to newfound cell, using two
Kind method carries out gravity treatment or switching between macrocell and cell:
1) target UE using Ts as the period carry out finger print data acquisition and matching search for, if target UE can not find it is matched slight
Area then needs to retract macrocell and obtains access link；If matching fingerprint and current cell fingerprint one that target UE is found
It causes, then UE holding resides in current cell；If the matching fingerprint that target UE is found is from new cell, target UE
It needs gravity treatment or is switched to new cell；
2) target UE uses the s-Measure measurement mechanism of LTE system on cell working frequency range, if UE monitors to service
The signal strength of cell starts to weaken and has the tendency that switching back to macrocell, then can be with return step 3), restart small cell
It was found that operation, so that target UE prepares gravity treatment or switches back into macrocell.
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| CN110351655B (en) * | 2019-07-10 | 2021-06-18 | 博睿泰克科技（宁波）有限公司 | Indoor positioning method and system based on signal multipath propagation measurement |
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| Title |
|---|
| Energy efficient small-cell discovery using received signal strength based radio maps;Athul Prasad 等;《Vehicular Technology Conference》;20130605;全文 * |
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| CN106792949A (en) | 2017-05-31 |
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