CN103442362B - Communication device and method for interference coordination and energy conservation with same adopted - Google Patents
Communication device and method for interference coordination and energy conservation with same adopted Download PDFInfo
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- CN103442362B CN103442362B CN201310379393.7A CN201310379393A CN103442362B CN 103442362 B CN103442362 B CN 103442362B CN 201310379393 A CN201310379393 A CN 201310379393A CN 103442362 B CN103442362 B CN 103442362B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses an inter-cell interference coordination and energy conservation device of a high-speed railway train-ground communication system. The device comprises a base station directional antenna, a base station wireless remoting unit, a base station baseband processing unit, a motor train unit parameter estimation unit, a base station controller, a train-mounted table directional antenna, a train-mounted table wireless remoting unit and a train-mounted table baseband processing unit. The invention further discloses a method, for inter-cell interference coordination and energy conservation of the high-speed railway train-ground communication system, with the device adopted. The motion vector and the location of a motor train unit are estimated and predicted in real time through the motor train unit parameter estimation unit, a small amount of base station equipment in the high-speed railway train-ground communication system is activated selectively, and therefore inter-cell interference and the power dissipation of the base station equipment are greatly reduced.
Description
Technical field
The present invention relates to the interference coordination of high-speed railway communication system, more particularly, to communication system and energy saver and adopt
The method carrying out interference coordination and energy-conservation with this device, belongs to wireless communication technology field.
Background technology
High-speed railway be can be provided by using GSM-R cordless communication network at present only arrowband, low-speed communication business, main
It is used for needed for railway system's internal pair production, far from the requirement meeting current Development of High Speed Railway.Due to high-speed railway transportation
Particularity, need the broadband car-ground wireless communication networks of design specialized to cover line of high-speed railway, to meet row control information, reality
When video monitoring, vehicle-mounted key equipment working state monitoring, the need of emergency communication guarantee, passenger's high-speed data communication and amusement
Ask.
Mobile communication system experience three generations development, evolve to the 4th generation cellular wireless system LTE of today it is achieved that from
Narrowband voice is to the transition of high-speed data.A new generation of China car-ground Communications System Segment in high-speed railway broadband adopts TD-LTE skill
Art, the presence of intercell interference that its identical networking produces is one of the key technology that must solve.The minizone of existing LTE system is done
Disturbing tuning algorithm is all to be covered as application scenarios with low speed, multi-user, multiple cell, planar, more than speed per hour 350km/ hour
High ferro environmental suitability is poor.Between therefore a kind of high-speed railway car-ground communication system cell the device of interference coordination and energy-conservation and
The exploitation of method is necessary.
Content of the invention
The technical problem to be solved is to provide interference coordination between a kind of high-speed railway car-ground communication system cell
With the device of energy-conservation, this device disclosure satisfy that speed per hour 350km/ hour and the need of the car-ground broadband wireless communications of above EMUs
Will, reduce the energy consumption of base station equipment simultaneously.
Present invention technical problem also to be solved is to provide interference coordination between a kind of high-speed railway car-ground communication system cell
Method with energy-conservation.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is as follows：
The device of interference coordination and energy-conservation between a kind of high-speed railway car-ground communication system cell, including base station directional antenna,
Base station radio extension unit, base station baseband processing unit, EMUs parameter estimation unit, base station controller, Vehicle mounted station orients sky
Line, Vehicle mounted station are wireless extension unit and Vehicle mounted station baseband processing unit；
Wherein, described base station directional antenna is made up of two back-to-back gain directional antenna, two described high-gains
The maximum of beam antenna points on the contrary, and its pointing direction is with rail direction point-blank；
Described base station radio extension unit is fixedly connected with beam antenna, and it is launched by beam antenna and receives wireless communication
Number；
Described base station baseband processing unit is connected with the wireless extension unit of multiple distributed base stations of high ferro configuration along the line, its
Base band signal process for base station side；
Described EMUs parameter estimation unit, EMUs movement velocity, direction and position that it by real-time estimation and is predicted
Put parameter information and be transferred to base station baseband processing unit, then base station controller is transferred to by base station baseband processing unit；
Described base station controller, is connected with multiple distributed base station baseband processing units；
Described Vehicle mounted station beam antenna is made up of two back-to-back gain directional antenna, two described high-gain orientations
The maximum of antenna is pointed on the contrary, and the maximum sensing of described gain directional antenna and the direction of motion of EMUs are in straight line
On；
Described Vehicle mounted station is wireless, and extension unit is fixedly connected with beam antenna, and it is received by beam antenna and launches wireless
Signal；
Described Vehicle mounted station baseband processing unit is connected with onboard wireless extension unit, and it is used for the baseband signal of EMUs side
Process.
Wherein, described base station directional antenna is made up of two back-to-back gain directional antenna, two described high-gains
The maximum of beam antenna points to contrary, the contrary gain directional antenna of two maximum sensings, and one of high-gain orients sky
The overlay area of line wave beam is 0～R rice, and the overlay area of another gain directional antenna wave beam is-R～0 meter.
The method of interference coordination and energy-conservation between a kind of high-speed railway car-ground communication system cell, concrete operation step is as follows：
Step 1, the overlay area of base station radio extension unit is divided into tri- areas of A1, A2, B；Wherein, for each base
Stand wireless extension unit（Hereinafter referred to as base station）For, it had both comprised the A1 area of coverage, and to comprise the A2 area of coverage adjacent with previous
The overlapping coverage areas B area of base station, and the overlapping coverage areas B area with a rear adjacent base station；
Step 2, in base station side, base station controller first passes through the EMUs motion to multiple EMUs parameter estimation unit
The analysis of speed, direction and location parameter data and process, real-time estimation and predict adjacent EMUs motion vector and
Position, the base station radio extension unit overlay area being divided in conjunction with step 1, implements cell activation algorithm and interference coordination is calculated
Method, selects the current base station radio extension unit providing covering of activation, closes other base station radio extension units.
Wherein, in step 1, A1 area represent apart from base station radio extension unit-（R-D）Region in the range of～0, A2 area
Represent apart from base station radio extension unit 0～（R-D）In the range of region, B area is the covering of the wireless extension unit of adjacent base station
Lid overlay region, its expression exists apart from base station radio extension unit（R-D）Region in the range of～R.
Wherein, described R is that the contrary directional antenna beams of the maximum sensing of base station radio extension unit two are covered each by
Distance, wherein, the coverage distance of directional antenna beams is 0～R rice, and the coverage distance of another directional antenna beams is-R
～0 meter, D is the length of the overlapping area of the wireless extension unit of adjacent base station.
Wherein, in step 2, base station controller real-time estimation and predict the current location of adjacent EMUs, velocity with
And the position that the T second is later.
Wherein, in step 2, described cell swashs method work algorithm, when the motor-car current location position later with the T second is in arbitrarily
The A1 area of coverage of one base station, and the motor-car direction of motion is close to this base station, activates the wave beam that this base station is located at A1 area, Vehicle mounted station
Wireless extension unit is using sensing and motor-car direction of motion identical wave beam and base station communication；
When motor-car current location is in the A1 area of coverage of a certain base station, the A2 that T second later position is in this base station covers
Area, and the motor-car direction of motion is close to this base station, activates the wave beam that this base station is located at A1 area and A2 area simultaneously, Vehicle mounted station wirelessly draws
Remote unit using point to motor-car direction of motion identical wave beam and base station in be located at the multibeam communication in A1 area, Vehicle mounted station is no simultaneously
Line extension unit prepares to point to the multibeam communication being located at A2 area in the wave beam contrary with the motor-car direction of motion and base station；
When the motor-car current location position later with the T second is in the A2 area of coverage of a certain base station, and the motor-car direction of motion is remote
From this base station, activate the wave beam that this base station is located at A2 area, Vehicle mounted station is wireless, and extension unit uses sensing and motor-car direction of motion phase
Anti- wave beam and base station communication；
When motor-car current location is in the A2 area of coverage of a certain base station I, T second later position is in the B area of coverage, and motor-car
The direction of motion, away from this base station, activates the wave beam that this base station is located at A2 area, and next one base station II adjacent with this base station I is located at
The wave beam in A1 area, Vehicle mounted station is wireless, and extension unit is located at A2 area using pointing to the wave beam contrary with the motor-car direction of motion with base station I
Multibeam communication, prepare to point to the multibeam communication being located at A1 area with motor-car direction of motion identical wave beam and base station II simultaneously；
When motor-car current location is in the B area of coverage, T second later position is in the B area of coverage or the A1 of/a certain base station I covers
Cover region, and the motor-car direction of motion, away from this base station II, activates the wave beam positioned at A2 area for the base station II and base station I ripple positioned at A1 area
Bundle, Vehicle mounted station is wireless, and extension unit is led to using pointing to the wave beam with base station II positioned at A2 area for the wave beam contrary with the motor-car direction of motion
Letter, is located at the multibeam communication in A1 area using sensing and motor-car direction of motion identical wave beam and base station I；Base station II is for motor-car
Through base station, base station I is the close base station of motor-car.
Wherein, in step 2, described interference coordination algorithm, the area of coverage according to residing for adjacent motor-car, calculate presence of intercell interference pair
The impact of signal interference ratio, signal interference ratio=(P2xn/P1xn)2, when signal interference ratio is more than threshold value L setting, do not carry out interference coordination；When
Signal interference ratio is less than threshold value L, more than [1+ (2R-D)/R]2When, base station controller dynamic dispatching frequency, time resource；Wherein,
P2xnFor the current location of motor-car I, P1xnThe current location of motor-car II, described motor-car I is adjacent with motor-car II.
Beneficial effect：Compared to prior art, between the car-ground communication system cell of high-speed railway of the present invention interference coordination and
The method of energy-conservation, has taken into full account the special networking model of line of high-speed railway, takes selective activation base station beam and dynamic
The method of frequency resource allocation, while farthest reducing presence of intercell interference, has been greatly reduced the energy of system equipment
Consumption.In addition, the apparatus structure letter using interference coordination and power-economizing method between high-speed railway of the present invention car-ground communication system cell
Single, reasonable.
Brief description
Fig. 1 is that the structure of interference coordination and energy saver between a kind of high-speed railway of the present invention car-ground communication system cell is shown
It is intended to；
Fig. 2 is base station ripple in interference coordination between a kind of high-speed railway of the present invention car-ground communication system cell and power-economizing method
Bundle covers schematic diagram；
Fig. 3 is fixed for base station in interference coordination between a kind of high-speed railway of the present invention car-ground communication system cell and power-economizing method
Directional diagram to antenna beam；
Fig. 4 is roof car in interference coordination between a kind of high-speed railway of the present invention car-ground communication system cell and power-economizing method
The directional diagram of microscope carrier directional antenna beams.
Specific embodiment
The present invention is expanded on further below in conjunction with accompanying drawing.
For convenience of description, small English alphabet later herein " x " represents that this position number can be replaced with positive integer, with table
Show different Vehicle mounted stations and base station equipment, velocity VxnMove as just close to BS-RRU direction, velocity VxnAway from BS-
It is negative that RRU moves in direction, base station radio extension unit（Abbreviation base station）.
As shown in figures 1-4, between a kind of high-speed railway car-ground communication system cell interference coordination and energy-conservation device, including
Base station directional antenna 14, base station radio extension unit 15BSx-RRU, base station baseband processing unit 16BSx-BBUx, EMUs ginseng
Number estimation unit 17BSx-TPU, base station controller 18BSC, Vehicle mounted station beam antenna 13, Vehicle mounted station are wireless extension unit 12UEx-
RRU and Vehicle mounted station baseband processing unit 11UEx-BBU, described base station directional antenna 14 is by the height of two back-to-back Unit 2 × 4
Gain directional antennas 14BxA1 and BxA2 are constituted, and antenna gain is 16dB, and its directional diagram is as shown in figure 3, BxA1 and BxA2 direction
The maximum of figure points on the contrary, and its pointing direction is with rail direction point-blank；Described base station radio extension unit 15, be
Double RF passage RRU, complete the mutual conversion of digital baseband and radiofrequency signal, and its RF interface passes through BxA1, BxA2 transmitting and receives
Wireless signal；The described base station baseband processing unit 16 wireless extension unit of multiple distributed base stations 15 phase configuring along the line with high ferro
Even, it includes the modules such as modulation, demodulation, coding, decoding, for the base band signal process of base station side；Described EMUs parameter is estimated
Meter unit 17BS-TPU, completes real-time estimation and the prediction of the movement velocity to EMUs, direction and location parameter；Described base
Station control 18BSC, manages multiple base station baseband processing unit 16BS-BBU for controlling, and forms single cell multiple antennas distributed
Cover, receive simultaneously and process the information of multiple EMUs parameter estimation unit 17BS-TSU, implement interference coordination algorithm and little
Qu Jifa work algorithm；Described Vehicle mounted station beam antenna 13 by two back-to-back Unit 2 × 4 gain directional antenna 13UxA1,
UxA2 is constituted, and antenna gain is 13dB, its directional diagram as shown in figure 4, UxA1 and UxA2 directional diagram maximum point to contrary, and its
With the EMUs direction of motion point-blank；Described Vehicle mounted station is wireless extension unit 12UEx-RRU, completes digital baseband and penetrates
The mutual conversion of frequency signal, it passes through UxA1, UxA2 and receives and transmitting wireless signal；Described Vehicle mounted station baseband processing unit
11UEx-BBU is wireless with Vehicle mounted station, and extension unit 12 is connected, for the base band signal process of EMUs side.
The method of interference coordination and energy-conservation between a kind of high-speed railway car-ground communication system cell, concrete operation step is：
Step 1, two maximums of base station radio extension unit point to contrary directional antenna beams BxA1, BxA2, wave beam
The coverage of BxA1 is -1500～0 meter, and wave beam BxA2 coverage is 0～1500 meter；Adjacent base station is wireless extension unit
The overlapping area of BS-RRU1 and BS-RRU2 is 300 meters；The covering of BS-RRUx is divided into tri- areas of A1, A2, B, A1 area is
Region in the range of -1200～0 meter for the base station radio extension unit BS-RRUx, A2 area represents base station radio extension unit BS-
Region in the range of 0～1200 meter for the RRUx, B area represents base station radio extension unit BS-RRUx in 1200～1500 meters of scopes
Interior region, B area is the overlapping area of base station beam B1A2 and B2A1；The spacing of two adjacent base stations are wireless extension unit is
2700 meters；
Step 2, in base station side, EMUs parameter estimation unit BS-TPU, complete the movement velocity to EMUs, direction,
The real-time estimation of location parameter, movement velocity, the acquisition of directioin parameter are passed through to estimate between UE Doppler frequency shift in reading BS-BBU
Connect and obtain, if radio-frequency carrier is f0, UE is df relative to the Doppler frequency shift of base station, then velocity is Vn=df/f0× C, f0For
Carrier wave, C is the light velocity, and roof Vehicle mounted station includes GPS information, and this information is real-time transmitted to base station, therefore can directly read BS-
The gps data of the UE present position of demodulation in RRU, thus obtain the position P of base station BS-RRUx relativelyn, in base station controller,
Real-time estimation and the current location P1 predicting adjacent EMUs UE1, UE2n、P2n, velocity V1n、V2n, T second later position
P1n+1=P1n+V1n× T, P2n+1=P2n+V2nThe starting time that × T, T need for base station activation wave beam, typically smaller than 1 second, in base
Station control 18, executes cell activation algorithm, the BS-RRU selecting the current offer of activation to cover, and closes other BS-RRU；
Using cell activation algorithm, work as Pxn、Pxn+1It is in the A1 area of coverage, and Vxn>=0, the B1A1 wave beam of activation base station, car
Microscope carrier UEx uses UxA2 wave beam and base station communication；
Using cell activation algorithm, work as PxnIt is in the A1 area of coverage, Pxn+1It is in the A2 area of coverage, and Vxn>=0, activate base station
B1A1, B1A2 wave beam, Vehicle mounted station UEx uses UxA2 wave beam and base station B1A1 multibeam communication, prepares UxA1 and base station simultaneously
B1A2 multibeam communication；；
Using cell activation algorithm, work as Pxn、Pxn+1It is in the A2 area of coverage, and Vxn＜ 0, the B1A2 wave beam of activation base station, car
Microscope carrier UEx uses UxA1 wave beam and base station communication；
Using cell activation algorithm, work as PxnIt is in the A2 area of coverage, Pxn+1It is in the B area of coverage, and Vxn＜ 0, activation base station
B1A2, B2A1 wave beam, Vehicle mounted station UEx uses the B1A2 multibeam communication of UxA1 wave beam and base station, prepares UxA2 and base station simultaneously
B2A1 multibeam communication；
Using cell activation algorithm, work as PxnIt is in the B area of coverage, Pxn+1It is in B or the/A1 area of coverage, and Vxn＜ 0, activates base
B1A2, B2A1 wave beam stood, Vehicle mounted station UEx uses the B1A2 multibeam communication of UxA1 and base station, using UxA2 wave beam and base station
B2A1 communicates；
Using cell activation algorithm, due to the spatial choice characteristic of beam antenna, for single Vehicle mounted station UE, activate ripple
The presence of intercell interference leading between bundle is negligible.
Coordinating district interference algorithm, according to P1xn、P2xnThe residing area of coverage, calculates the shadow to signal interference ratio SIR for the presence of intercell interference
Ring, work as P1xn、P2xnIt is in the similar area of coverage, can produce between the base station beam of activation and interfere, with the letter as reference for the UE1
Dry ratio is SIR=(P2xn/P1xn)2, SIR minima occurs to be spaced apart the similar area of coverage situation of R in activation, and now UE1 is in
Cover at edge R, SIR |min=[1+(2R-D)/R]2=7.84；When SIR is more than threshold value 100, interference is negligible, does not carry out
Interference coordination；When SIR is less than threshold value 100, during more than 7.84, base station controller, the frequency of scheduling activation BS-RRUx, time
Resource, enables the Resource Block non-overlapping copies shared by BS-RRUx it is ensured that UE1, UE2 are with rational data transfer rate and base station BS-RRUx
Reliably communicated.
In the described embodiment, between using a kind of car-ground communication system cell of high-speed railway of the present invention interference coordination and
The device of energy-conservation, and the method using this device, by predicting motion vector and the position of EMUs, select in activation system
A small amount of base station equipment, thus greatly reducing the interference of minizone and the power consumption of base station equipment, runs speed with high ferro EMUs
Degree 350km/ hour, calculates as a example minimum tracking train intervals 6 minutes, base station radio extension unit spacing 3km, and two-wire is run
High-speed railway, most only two contrary row EMUs of traffic direction in the range of 35km, BS-RRU quantity is 12, averagely
The base station number of activation is 2, and the system power dissipation of the present invention is only base station is all activated 1/6, and energy consumption substantially reduces.The present invention's
The signal interference ratio SIR minimum 7.84 that presence of intercell interference leads to（8.9dB）, the identical networking comparing general commercial LTE has and changes greatly very much
Kind.
Those of ordinary skill in the art will be appreciated that, embodiment described here is to aid in reader and understands this
Bright protection domain does not limit to and such special statement and embodiment.Those of ordinary skill in the art can be according to this
Bright disclosed these technology enlightenment is made various other various concrete deformation without departing from present invention essence and is combined, these deformation
Still within the scope of the present invention with combining.Protection scope of the present invention is only defined by claims.
Claims (2)
1. between a kind of high-speed railway car-ground communication system cell interference coordination and energy-conservation device it is characterised in that：Including base station
Beam antenna (14), base station radio extension unit (15), base station baseband processing unit (16), EMUs parameter estimation unit
(17), base station controller (18), at Vehicle mounted station beam antenna (13), Vehicle mounted station is wireless extension unit (12) and Vehicle mounted station base band
Reason unit (11)；
Wherein, described base station directional antenna (14) is made up of two back-to-back gain directional antenna, two described high-gains
The maximum of beam antenna points on the contrary, and its pointing direction is with rail direction point-blank；
Described base station radio extension unit (15) is fixedly connected with beam antenna (14), and it passes through beam antenna (14) transmitting and connects
Receive wireless signal；
Described base station baseband processing unit (16) multiple distributed base stations wireless extension unit (15) phase configuring along the line with high ferro
Even, it is used for the base band signal process of base station side；
Described EMUs parameter estimation unit (17), EMUs movement velocity, direction and position that it by real-time estimation and is predicted
Put parameter information and be transferred to base station baseband processing unit (16), then base station controller is transferred to by base station baseband processing unit (16)
(18)；
Described base station controller (18), is connected with multiple distributed base station baseband processing units (16)；
Described Vehicle mounted station beam antenna (13) is made up of two back-to-back gain directional antenna, two described high-gain orientations
The maximum of antenna is pointed on the contrary, and the maximum sensing of described gain directional antenna and the direction of motion of EMUs are in straight line
On；
Described Vehicle mounted station is wireless, and extension unit (12) is fixedly connected with beam antenna (13), its pass through beam antenna (13) receive and
Transmitting wireless signal；
Described Vehicle mounted station baseband processing unit (11) is connected with onboard wireless extension unit (12), and it is used for the base band of EMUs side
Signal processing；
Wherein, described base station directional antenna (14) is made up of two back-to-back gain directional antenna, two described high-gains
The maximum of beam antenna points to contrary, the contrary gain directional antenna of two maximum sensings, and one of high-gain orients sky
The overlay area of line wave beam is 0～R rice, and the overlay area of another gain directional antenna wave beam is-R～0 meter.
2. between a kind of high-speed railway car-ground communication system cell interference coordination and energy-conservation method it is characterised in that：Concrete operations
Step is as follows：
Step 1, the overlay area of base station radio extension unit is divided into tri- areas of A1, A2, B；A1 area represents apart from base station no
Region in the range of-(R-D)～0 for the line extension unit, A2 area represents apart from base station radio extension unit in 0～(R-D) scope
Interior region, B area is the overlapping area of the wireless extension unit of adjacent base station, and its expression exists apart from base station radio extension unit
(R-D) region in the range of～R；Described R is that the contrary directional antenna beams of the maximum sensing of base station radio extension unit two divide
The distance of not other covering, wherein, the coverage distance of directional antenna beams is 0～R rice, the covering of another directional antenna beams
Distance is-R～0 meter, and D is the length of the overlapping area of the wireless extension unit of adjacent base station；
Step 2, in base station side, base station controller first passes through the EMUs motion speed to multiple EMUs parameter estimation unit
The analysis of degree, direction and location parameter data and process, real-time estimation and the motion vector and the position that predict adjacent EMUs
Put, the base station radio extension unit overlay area being divided in conjunction with step 1, implement cell activation algorithm and interference coordination is calculated
Method, selects the current base station radio extension unit providing covering of activation, closes other base station radio extension units；Base station controls
The device real-time estimation position later with current location, velocity and the T second of predicting adjacent EMUs；
Wherein, described cell swashs method work algorithm, when the motor-car current location position later with the T second is in the A1 of any one base station
The area of coverage, and the motor-car direction of motion is close to this base station, activates the wave beam that this base station is located at A1 area, Vehicle mounted station is wireless extension unit
Using sensing and motor-car direction of motion identical wave beam and base station communication；
When motor-car current location is in the A1 area of coverage of a certain base station, T second later position is in the A2 area of coverage of this base station, and
The motor-car direction of motion is close to this base station, activates the wave beam that this base station is located at A1 area and A2 area simultaneously, and Vehicle mounted station wirelessly zooms out list
Unit is wirelessly drawn using the multibeam communication being located at A1 area in sensing and motor-car direction of motion identical wave beam and base station, simultaneously Vehicle mounted station
Remote unit prepares to point to the multibeam communication being located at A2 area in the wave beam contrary with the motor-car direction of motion and base station；
When the motor-car current location position later with the T second is in the A2 area of coverage of a certain base station, and the motor-car direction of motion is away from this
Base station, activates the wave beam that this base station is located at A2 area, and Vehicle mounted station is wireless, and extension unit is contrary with the motor-car direction of motion using pointing to
Wave beam and base station communication；
When motor-car current location is in the A2 area of coverage of a certain base station I, T second later position is in the B area of coverage, and motor-car motion
The wave beam that this base station is located at A2 area, away from this base station, is activated in direction, and next one base station II adjacent with this base station I is located at A1 area
Wave beam, Vehicle mounted station is wireless extension unit is using pointing to the ripple with base station I positioned at A2 area for the wave beam contrary with the motor-car direction of motion
Shu Tongxin, prepares to point to the motor-car direction of motion identical wave beam multibeam communication positioned at A1 area with base station II simultaneously；
When motor-car current location is in the B area of coverage, T second later position is in the B area of coverage or the A1 area of coverage of/a certain base station I,
And the motor-car direction of motion is away from this base station II, activates the wave beam positioned at A2 area for the base station II and base station I is located at the wave beam in A1 area, vehicle-mounted
Platform is wireless, and extension unit is located at the multibeam communication in A2 area, use using the sensing wave beam contrary with the motor-car direction of motion and base station II
Point to the motor-car direction of motion identical wave beam multibeam communication positioned at A1 area with base station I；Base station II passes through for motor-car
Base station, base station I is the close base station of motor-car；
Described interference coordination algorithm, the area of coverage according to residing for adjacent motor-car, calculate the impact to signal interference ratio for the presence of intercell interference, letter is dry
Than=(P2xn/P1xn)2, when signal interference ratio is more than threshold value L setting, do not carry out interference coordination；When signal interference ratio is less than threshold value
L, more than [1+ (2R-D)/R]2When, base station controller dynamic dispatching frequency, time resource；Wherein, P2xnPresent bit for motor-car I
Put, P1xnThe current location of motor-car II, described motor-car I is adjacent with motor-car II.
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|---|---|---|---|---|
| CN103873119B (en) * | 2014-03-27 | 2017-02-01 | 西南交通大学 | Vehicle-mounted double-antenna communication method |
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