CN102196477B - Method for optimizing wireless network fit for high-speed vehicle-mounted environment - Google Patents
Method for optimizing wireless network fit for high-speed vehicle-mounted environment Download PDFInfo
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- CN102196477B CN102196477B CN 201110139892 CN201110139892A CN102196477B CN 102196477 B CN102196477 B CN 102196477B CN 201110139892 CN201110139892 CN 201110139892 CN 201110139892 A CN201110139892 A CN 201110139892A CN 102196477 B CN102196477 B CN 102196477B
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Abstract
The invention discloses a method for optimizing a wireless network fit for a high-speed vehicle-mounted environment, which comprises the following steps: (1) when a system is about to communicate and needs to be accessed to a frequency spectrum, detecting the use condition of the frequency spectrum in the area in which the system is located, choosing and accessing a suitable frequency band according to a preset method and the size of own traffic volume of the system, and keeping enough protection bandwidth between frequency bands, thereby avoiding harmful interference; (2) after accessing the system to the frequency spectrum, adjusting the transmitting power and occupied bandwidth of each system according to a channel condition and the size of own traffic volume; and (3) when the protection bandwidth is reduced under the influence of the increasing traffic volume of the system and the expanding occupied bandwidth of the system, automatically adjusting the frequency spectrum to move towards the direction of an idle frequency spectrum by each system, thereby meeting the respective requirements of bandwidth and protection bandwidth.
Description
Technical field
The present invention relates in wireless communication field, UE is in the situation that high-speed mobile, the gravity treatment of residential quarter and switching.
Background technology
It is situation static or low-speed motion that the communication cell handoff technique that adopts at present is only applicable to community user.But if under high-speed mobile scene, because the distance between the station is smaller, the speed of vehicle is very fast, and the time by the residential quarter will shorten greatly, thereby causes the frequent switching of residential quarter, and the user does not have the sufficiently long time execute switching flow and go offline.Want head it off, need to extend the time that switch the residential quarter, on garage's route antenna for base station steel tower along the line, or set up antenna for base station, or set up one-sided adjacent base station directly put antenna, or set up the bilateral neighbor base station directly put antenna, in order to increasing Zone switched covering radius, thereby extend the time of carrying out switching flow.
Summary of the invention
The method for optimizing wireless network that the purpose of this invention is to provide a kind of suitable high speed vehicle environment, can effectively solve in unauthorized frequency range, the method that acentric multisystem sets according to the present invention, access suitable frequency range, can increase the transmitting power of self, but and the power sum of potential interference signal must be less than the threshold value of stipulating in described preordering method.When the system business amount increases, can suitably increase shared spectral bandwidth, but and the protection bandwidth GBW between adjacent spectra can not be less than the Minimal Protective bandwidth of stipulating in presetting method.If traffic carrying capacity continues to increase; required bandwidth constantly increases; the protection bandwidth is at this moment less than the property protection bandwidth MoveGBW forced to move that stipulates in presetting method; at this moment each system is according to default method; dynamically adjust own shared frequency band position; when satisfying own required frequency band, make protection bandwidth GBW as far as possible greater than property protection bandwidth MoveGBW forced to move.If after each system's adjustment, the protection bandwidth GBW of system is still less than property protection bandwidth MoveGBW forced to move, but system still needs spread bandwidth, can allow that this system continues spread bandwidth, but protection bandwidth GBW must be more than or equal to Minimal Protective bandwidth MinGBW.When extending to, system bandwidth make protection bandwidth GBW equal Minimal Protective bandwidth MinGBW; system stops spread bandwidth; afterwards along with each system adjusts the frequency spectrum situation again, make the protection bandwidth of this system increase, this system just can carry out frequency spectrum and moves and expand subsequently.
To achieve these goals, the invention provides a kind of method for optimizing wireless network of suitable high speed vehicle environment, comprise the steps:
(1) when a system will communicate and need the access frequency spectrum, survey the frequency spectrum behaviour in service in zone of living in, according to default method and the size of own service amount, select suitable frequency band access, must keep enough protection bandwidth between each frequency range simultaneously, to avoid harmful interference;
(2) be linked into frequency spectrum after, each system is according to the transmitting power of the size adjustment oneself of channel conditions and own service amount and the bandwidth that takies;
(3) due to the increase of system business amount, the shared bandwidth expansion of system causes reducing of protection bandwidth, and each system can adjust frequency spectrum automatically moves its direction towards idle frequency spectrum, satisfies bandwidth and the protection bandwidth of needs separately.
Through checking, the spectral method of dynamically sharing provided by the invention can make multisystem well share wireless frequency spectrum (detailed process is seen specific implementation process).
In one embodiment of the invention, described step (1) is specially:
(21) according to default method, accessed the frequency spectrum use information of broadcasting oneself of each system cycle of frequency spectrum;
(22) according to default method, the system that will access frequency spectrum sends the frequency spectrum request, and the frequency spectrum of collecting each system that has accessed frequency spectrum uses information;
(23) according to default method, the system that does not need to access frequency spectrum keeps silent;
(24) according to default method, the system of application access frequency spectrum obtains a frequency spectrum use figure according to the information of collecting, and according to this drawing system and self required bandwidth, selects suitable frequency band access.
(25) according to default method, frequency band and the protection bandwidth (GBW) between the adjacent system band occupancy that system selects to access should be greater than property protection bandwidth forced to move (MoveGBW).
In one embodiment of the invention, described step (24) is specially:
(31) according to default method, whether at certain band transmit signal, need to be with the transmission power information of the other system collected (can with other system as potential interference signal), and a certain threshold values of presetting method regulation compares;
(32) described threshold value is a function in presetting method;
(33) according to default method, if the power level of described potential interference signal lower than described threshold level, described system transmits on this wireless channel;
(34) according to default method, if the power level of described potential interference signal higher than described threshold level, described system needs switching channels to transmit;
In one embodiment of the invention, described step (2) is specially:
(41) after system successfully is linked into frequency spectrum, in order to improve signal to noise ratio snr, system can increase transmitting power, at this moment needs the power of interference signal and the threshold value described in the same step of transmitting power sum (41) are compared, and increases transmitting power until close to threshold level;
(42) after system successfully was linked into frequency spectrum, when number of services increased, the bandwidth of the shared frequency spectrum of system needed to increase thereupon, may cause reducing of protection bandwidth, until the Minimal Protective bandwidth MinGBW of presetting method regulation;
In one embodiment of the invention, described step (3) is specially:
(51) due to the increase of system business demand, shared bandwidth constantly increases, and the protection bandwidth between adjacent spectra will be reduced to the Minimal Protective bandwidth of agreement regulation;
(52) the protection bandwidth is too small, and is very large to the harmful interference meeting of system, needs to adjust the frequency spectrum operating position of each system;
(53) because each system is an acentric topological network, each system just needs according to default method, dynamically adjusts the frequency spectrum behaviour in service, makes and leaves enough protection bandwidth between each system.
Description of drawings
Fig. 1 is a kind of wireless network deployment of suitable high speed vehicle environment and the flow chart of optimization method;
The high speed vehicle environment wireless network coverage diagram that Fig. 2 preliminary planning is Zone switched;
Fig. 3 has introduced the high speed vehicle environment wireless network coverage diagram that switches grand zone;
Fig. 4 has configured the high speed vehicle environment wireless network coverage diagram of base station and discharging-directly station antenna transmitting power.
Reference numeral: 1-steel tower first; 2-steel tower second; 3-steel tower third; 4-steel tower fourth; 5-steel tower penta; The 6-steel tower is own; 7-steel tower heptan; A-antenna for base station A; B-antenna for base station B; Za-is directly put antenna A; Zb-is directly put antenna B; Zy-is directly put antenna Y; Zz-is directly put antenna Z; Area-switches grand zone; The L-dual-way vehicle road of travelling; Sector1-sector 1; Sector2-sector 2
Embodiment
Understand and implement the present invention for the ease of those of ordinary skills, the present invention is described in further detail below in conjunction with the drawings and the specific embodiments.
(1) adopt the mode of antenna for base station+direct station antenna to carry out networking, can effectively carry out wire and cover, increased the switching distance, extended switching time, reduced switching times, thereby improved the network coverage quality on vehicle-mounted circuit.
(2) on this basis, introduce and switch grand regional area, the position that produces switching is fixed on switches in grand zone (as accompanying drawing 3), and satisfy two-way switching, improve the success rate of switching, reduce the cell edge cutting off rate.
(3) switching grand zone specifically describes: as shown in Figure 3, Zone switchedly mainly refer to switch the highway section, Zone switched can be greater than coverage radius of cell,, be called and switch grand zone during greater than coverage radius of cell when Zone switched.
(4) in the covering scheme of speed car carrier radio communication network, the mode of employing antenna for base station+discharging-directly station antenna is carried out networking and is had more advantage than traditional base station coverage mode, switch grand zone because produced, make the vehicle of running at high speed have the sufficiently long time to execute switching flow.As shown in Figure 4, one total steel tower first 1, steel tower second 2, steel tower the third 3, steel tower fourth 4, steel tower penta 5, steel tower oneself 6 and steel tower steel tower in heptan 7 we in the middle of steel tower second 2 and the steel tower penta 5 route or travel by vehicle L as example, set up antenna for base station A a on steel tower second 2, set up antenna for base station Bb on steel tower penta 5.Consider the amphicheirality of Vehicle Driving Cycle, all set up on steel tower the third 3 and steel tower fourth 4 and directly put antenna A za and directly put antenna B zb.the transmitting power of directly putting antenna A za on steel tower the third 3 is identical with the transmitting power of antenna for base station A a, but the sub-carrier signal that must consider antenna for base station A a and directly put same frequency on antenna A za can not be distributed to same user, prevent co-channel interference, and the transmitting power of directly putting antenna A za on steel tower fourth 4 compare with antenna for base station A a can be artificial decline xdB, the purpose of doing like this is that two by setting up at antenna for base station A a directly put antenna A za and make the coverage of antenna for base station A a expand to a side on one side, thereby just enlarged the coverage of antenna for base station A a, the transmitting power of directly putting antenna B zb on steel tower fourth 4 is identical with the transmitting power of antenna for base station B b, the sub-carrier signal of considering equally antenna for base station B and directly putting the upper same frequency of antenna B can not be distributed to same user, prevent co-channel interference, and the transmitting power of directly putting antenna B on steel tower third compare with antenna for base station B b can be artificial decline xdB, the purpose of doing like this is that two by setting up at antenna for base station B b directly put antenna B zb and make the coverage of antenna for base station B b expand to a side on one side, thereby has just enlarged the coverage of antenna for base station B b.The place of antenna for base station A a and antenna for base station B b overlapped coverage has just formed switches grand regional area.For the radius size of switching grand regional area, to decide according to actual conditions, can (directly put B@-xdB) and the antenna A za transmitting power of directly putting on steel tower fourth 4 (is directly put A@-xdB) and formed the grand regional area of suitable switching by the antenna B zb transmitting power of directly putting of adjusting on steel tower the third 4.Suppose that the vehicle of running at high speed penta 5 travels from steel tower second 2 to steel tower, the power that travelling carriage on car receives antenna for base station A a emission is weakening gradually, and the power that receives antenna for base station Bb emission is strengthening gradually, after vehicle has entered the grand regional area of switching, travelling carriage on car is after complete and antenna for base station B b get in touch with, just can cut off and hold and the contacting of antenna for base station A a, switch grand regional area owing to having had in this process, vehicle just has complete switching flow sufficiently long switching time, realizes seamless switching.From the process that steel tower penta 5 travels to steel tower second 2, handoff procedure as mentioned above when the vehicle of running at high speed.Can also adopt two directed sector, sector 1sector1 of a private base station antenna and sector 2sector2 to cover for the covering of switching grand regional area, on car, the handoff procedure of travelling carriage similarly, as described above.
The above, only that concrete case study on implementation of the present invention is described, but be not to limit practical range of the present invention, such as those skilled in the art not breaking away from all equivalence changes of completing under the indicated spirit of the present invention and principle or modifying, must be covered by the scope of claim of the present invention.
Claims (2)
1. the method for optimizing wireless network of a suitable high speed vehicle environment is characterized in that comprising the following steps:
Step 1, wireless network overlay environment vehicle-mounted according to high speed and covering demand, the estimation radius of society, and preliminary planning is Zone switched, wherein, radius of society is mainly decided according to the construction condition of covering demand and reality; Zone switchedly mainly refer to switch the highway section,, be called and switch grand zone during greater than radius of society when Zone switched;
Step 2, on garage's route antenna for base station steel tower along the line, set up antenna for base station, one-sided neighbor base station directly put antenna or bilateral neighbor base station directly put antenna, with one independently two sectors of base station cover specially and switch grand zone;
Step 3, set the power of each antenna for base station mouth and each discharging-directly station antenna mouth, when Zone switched have time enough execute switching flow and not call drop or go offline in the design speed per hour with interior passing through to guarantee vehicle.
2. the method for optimizing wireless network of suitable high speed vehicle environment as claimed in claim 1 is characterized in that: the switching flow that executes in described step 3 refers to that the flow performing of the flow process of air interface and network side is complete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110139892 CN102196477B (en) | 2011-05-27 | 2011-05-27 | Method for optimizing wireless network fit for high-speed vehicle-mounted environment |
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| CN 201110139892 CN102196477B (en) | 2011-05-27 | 2011-05-27 | Method for optimizing wireless network fit for high-speed vehicle-mounted environment |
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| CN102196477B true CN102196477B (en) | 2013-11-06 |
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| CN103379507B (en) * | 2012-04-27 | 2015-11-25 | 华为技术有限公司 | A kind of network plan method based on RSVP, optimization method and device |
| CN103716799B (en) | 2012-09-29 | 2017-12-05 | 华为技术有限公司 | Method, equipment and the system of frequency spectrum division |
| US20140274049A1 (en) * | 2013-03-12 | 2014-09-18 | Qualcomm Incorporated | Method and apparatus for ue measurement assisted handover classification |
| CN109474741B (en) * | 2018-11-15 | 2020-11-13 | 惠州Tcl移动通信有限公司 | Method for communication continuation during movement, mobile terminal and computer readable storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1237075A (en) * | 1998-03-04 | 1999-12-01 | 三星电子株式会社 | Method for determining number of effective channels and effective channel rate in CDMA network, method for designing CDMA network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1237075A (en) * | 1998-03-04 | 1999-12-01 | 三星电子株式会社 | Method for determining number of effective channels and effective channel rate in CDMA network, method for designing CDMA network |
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