CN1859784A - Cell switching control method of high speed moving terminal - Google Patents
Cell switching control method of high speed moving terminal Download PDFInfo
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- CN1859784A CN1859784A CNA2006100346753A CN200610034675A CN1859784A CN 1859784 A CN1859784 A CN 1859784A CN A2006100346753 A CNA2006100346753 A CN A2006100346753A CN 200610034675 A CN200610034675 A CN 200610034675A CN 1859784 A CN1859784 A CN 1859784A
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Abstract
The present invention provides high speed mobile terminal cell switchover control method. Said method includes when terminal moves away current service base station at higher set traveling speed and approaches predicted target cell, network side judges target cell signal whether satisfying pre-switching condition, if satisfying then starting up pre-switching and establishing channel in target cell. Said invention realizes high speed mobile terminal switching through predetermining mobile terminal travel direction, pre-applying channel resource in target cell and establishing channel.
Description
Technical field
The present invention relates to the cell switching control method in a kind of wireless communication technology, refer to the method for the sub-district switching controls that a kind of user of being applicable to uses especially when high-speed mobile.
Background technology
Global system for mobile communications (Global System for Mobile Communication, GSM) in, along with moving of terminal, network side usually will change the handover operation to the Terminal Service sub-district.The sub-district switching is initiated by network usually, generally is signal strength signal intensity and the signal quality that obtains current service cell and neighbor cell according to the measurement report of terminal to report, triggers handover operation by certain switch decision algorithm again.
In the hauling operation of railway, highway, river one class, train, automobile, boats and ships etc. all are to move towards a direction apace usually, thereby when realizing wireless mobile communications, can handle according to the mobile communication system that linear chain type covers.
Railway combined digital mobile communication technology (Global System of Mobile Communicationfor Railways, GSMR) be and a kind ofly utilize the railway chain type to cover promptly to cover along railway line, a general sub-district has the characteristics of two adjacent areas to carry out the technology of railway communication and signal controlling.It as service bearer, carries out special processing at the needs of high speed mobile terminal with the gsm communication technology, and satisfy high speed conversation, the short calling of railway communication application need and set up, and the scheduling of train and operations such as control automatically.
In the network that chain type as shown in Figure 1 covers, terminal has been set up special-purpose the connection with network.At set intervals, terminal is to the network reporting measurement reports, and this measurement report comprises the incoming level of the current persistent district of terminal and the information such as incoming level of adjacent area.The measurement report of network based terminal to report carries out power control and switching controls.
The so-called switching is meant that the terminal of having set up special-purpose connection moves in the networking, network guarantees terminal constantly level and smooth roaming of words in each sub-district by switching controls.Switching controls is finished by network side.As shown in Figure 2, the measurement report of network based terminal judges whether the level of adjacent area satisfies switching condition.When the adjacent area level surpassed the certain thresholding of persistent district level, network side started switching flow.
Yet, consider the characteristics of GSMR system fast moving, if network side need be by judging that a plurality of measurement reports switch in a period of time, may occur then that train has moved out Serving cell but switch situation about also not finishing, cause dropped calls.
In view of the foregoing, the present invention proposes a kind of new method for handover control, promote performance of handoffs.
Summary of the invention
The object of the present invention is to provide a kind of cell switching control method that is applied to high speed mobile terminal, adopt handoff algorithms in advance, improve success rate for switching.
The object of the invention is achieved through the following technical solutions: a kind of cell switching control method of high speed mobile terminal, this method comprises that the motion that is higher than set point with translational speed when terminal is during away from Current Serving BTS, convergence scheduled target sub-district, network side judges whether the signal of Target cell satisfies the pre-switch condition, and when satisfying switching condition, start pre-switch, set up channel at Target cell.
Network side preservation sub-district neighborhood region correlation chart switches the cell id leave to carry out the judgement of terminal moving direction by the record terminal.
Network side is estimated the Target cell that terminal will enter according to sub-district neighborhood region correlation chart and terminal moving direction.
Network side is after Target cell is set up channel, and whether the signal that continues the detection Target cell satisfies switching condition, and carries out the sub-district switching when satisfying switching condition.
When network side does not satisfy switching condition at the signal that detects Target cell, wait for,, then discharge the Target cell channel as still not satisfying switching condition.
Terminal is in real time to the network reporting measurement reports, and its measurement report content comprises the incoming level Rx of terminal, the level of this sub-district and the level of adjacent area, and network side can calculate the translational speed of terminal according to the measurement report of terminal to report.
Network side is according to the translational speed of radio transmission model computing terminal, and its formula is as follows:
Rx1＝Tx-Ld1
Rx2＝Tx-Ld2
Ld＝69.55+26.16lg(f)-13.82lg(hb)+(44.9-6.55lg(hb))lgd-A
Tx is base station transmitting power (known) in the formula
F is system works frequency (known)
Hb is a base station antenna height, according to the experience value
D is the distance (wait ask) of base station to travelling carriage
A is the travelling carriage height correction, according to the experience value
Network side can be according to Rx and Ld formula, calculate the base station to travelling carriage apart from d, and then calculate travelling carriage speed V=(d2-d1)/t, wherein t is the time interval of terminal through two distance calculation points.
Network side can be analyzed the adjacent area level according to the measurement report of terminal to report and whether satisfy pre-switch condition and handoff threshold condition.
Described preset value, pre-switch condition and switching condition are generally experience and set, and wherein pre-switch condition and switching condition refer to the thresholding of handover operation separately.
Described method is applied in the sub-district switching controls of chain type overlay network.
Compared with prior art, the present invention in Target cell request channel resource, sets up channel in advance by pre-determining the moving direction of high speed mobile terminal, thereby realizes rapid, the switching in time of high speed mobile terminal, improves handover success rate.
Description of drawings
Fig. 1 is the sub-district schematic diagram of chain type overlay network.
Fig. 2 is the flow process diagram that channel switches in the prior art.
Fig. 3 is for existing the sub-district schematic diagram of area covered in the chain type overlay network.
Fig. 4 is the flow process diagram of the sub-district switching controls of high speed mobile terminal of the present invention.
Embodiment
The cell switching control method of a kind of high speed mobile terminal of the present invention, this method comprises that the motion that is higher than set point with translational speed when terminal is during away from Current Serving BTS, convergence scheduled target sub-district, network side judges whether the signal of Target cell satisfies the pre-switch condition, and when satisfying switching condition, start pre-switch, set up channel at Target cell.
In the chain type overlay network as shown in Figure 1, all there are two adjacent areas each sub-district, and (Base Station Controller BSC) preserves this neighborhood region correlation chart to base station controller, and safeguards sub-district direction chained list as follows.
CELL
1-＞CELL
2-＞CELL
3-＞... CELL
nA--＞B direction
CELL
n-＞CELL
(n-1)-＞CELL
(n-2)-＞... CELL
1B--＞A direction.
Because rail transportation system middle orbit kinetic characteristic, so the terminal direction of motion remains unchanged usually.The cell id that BSC leaves by last twice switching of record terminal can carry out direction of motion judgement after each terminal is switched.In Fig. 1, suppose terminal with A-＞B motion, when terminal by CELL
1Switch to CELL
2After, the BSC record sub-district CELL that last time, switching was left
1When terminal moves to CELL
3After, the terminal of BSC record through cell information is: CELL
1, CELL
2, add current service cell, so the sub-district of terminal process is followed successively by: CELL
1, CELL
2, CELL
3,, be easy to just determine the direction of motion A-＞B of terminal according to the sub-district direction chained list that BSC preserves.
As shown in Figure 3, if network exists the situation of area covered, i.e. CELL
1Cross CELL
2The district covers CELL
3The part scope, this moment, the sub-district of process of terminal may be CELL
1-＞CELL
2-＞CELL
1, in this case, BSC judge when 3 sub-districts of terminal process have repetition or 3 of record through invalid cell is arranged in the sub-district, think this direction of motion annulment, still use the court verdict of original direction.
When judging the direction of motion of the relative base station of terminal, network side is according to Doppler effect, and promptly wave source is when fixedly the recipient moves, and the wave frequency that the recipient receives can be more and more higher, analyze the signal of the received terminal that is moving emission, thereby judge the direction of motion of the relative base station of terminal.This deterministic process is a prior art, specifically can disclose the 1st, 599 referring to Chinese invention patent, 473A number.
In addition, because terminal is when the network high speed moves, in real time to the network reporting measurement reports, so network side can calculate the translational speed of terminal according to the time interval of the measurement report of terminal to report and fore-and-aft survey report, and whether the adjacent area level satisfies the pre-switch thresholding.Wherein, the measurement report content of terminal to report comprises: the level of the incoming level Rx of terminal, the level of this sub-district, adjacent area 1, the level of adjacent area 2.The speed of terminal to report measurement report is that every 480ms reports once.
According to radio transmission model:
Rx1＝Tx-Ld1
Rx2＝Tx-Ld2
Ld＝69.55+26.16lg(f)-13.82lg(hb)+(44.9-6.55lg(hb))lgd-A
In the formula:
Tx is base station transmitting power (known).
F is system works frequency (known).
Hb is a base station antenna height, is generally 30～40 meters (acquiescence empirical values).
D is the distance (wait ask) of base station to travelling carriage.
A is the travelling carriage height correction, is generally 1.2 (acquiescence empirical values).
Therefore, network side can be according to Rx and Ld formula, calculate the base station to travelling carriage apart from d, and then calculate travelling carriage speed V=(d2-d1)/480ms.Need to prove that this result is the result of calculation of two adjacent measurement reports under the complete ecotopia, actual needs basis repeatedly measurement report result is carried out comprehensive average.
When terminal satisfied following 4 conditions, network side carried out the channel pre-switch, sets up channel at Target cell:
A. the terminal direction of motion is consistent with sub-district direction chained list;
B. the direction of motion is away from the current service cell base station;
C. movement rate is higher than set point, satisfies and switch requirement at a high speed;
D. the adjacent area level satisfies the pre-switch threshold condition.
As shown in Figure 4, terminal is to the network side reporting measurement reports, network side is analyzed the adjacent area level according to measurement report and whether is satisfied the pre-switch threshold condition, whether the translational speed of computing terminal is higher than a preset value, satisfies and switch requirement at a high speed, simultaneously, network side judges that the direction of motion of terminal is whether consistent with the sub-district direction chained list that BSC is safeguarded, and whether the direction of motion of terminal is away from the current service cell base station.When above-mentioned condition all satisfied, the Target cell that BSC moves to terminal sent the instruction that activates channel.Need to prove, this speed preset value (as 80KM/H) and pre-switch thresholding, rule of thumb value is set usually, can be according to the cell conditions adjustment.
Network side continue to detect follow-up measurement report, and the level when the examining report display-object sub-district of terminal to report satisfies switching condition, then starts switching command, and terminal is switched to Target cell.If do not satisfy switching condition, then wait for some time-count cycles.If still do not satisfy switching condition, then discharge the Target cell channel.
As shown in Figure 1, therefore the terminal that is in high-speed moving state at network can determine that the traffic direction of terminal is A-＞B through sub-district CELL1, CELL2.In addition, according to Doppler effect, network side can be judged terminal and begin away from Current Serving BTS.
At this moment, it is as follows that terminal to report is given the measurement report of network side:
Time 1: resident CELL3-85dBm CELL2-90dBm CELL4-95dBm
Time 2: resident CELL3-80dBm CELL2-95dBm CELL4-90dBm
Time 3: resident CELL3-80dBm CELL2-100dBm CELL4-85dBm
Time 4: resident CELL3-85dBm CELL2-105dBm CELL4-80dBm
Time 5: resident CELL3-90dBm CELL2-110dBm CELL4-75dBm
According to above-mentioned measurement report, in the time 5, adjacent area CELL4 level surpasses persistent district 15dB (handoff threshold), and prior art starts switching flow usually at this moment.And in the present invention, owing to know the moving direction of terminal in advance, so network side just can start the pre-switch flow process in the time 3, in advance in CELL4 request channel resource.After the application of CELL4 channel resource was finished, network judged that whether present handoff threshold satisfies, if do not satisfy, then waits for; Signal as Target cell has satisfied the handoff threshold requirement, and then network sends switching command to terminal, starts terminal and switches to CELL4.For the terminal of high-speed mobile, can start switching flow in advance like this, guarantee finishing smoothly of switching.
The present invention in Target cell request channel resource, sets up channel in advance by pre-determining the moving direction of high speed mobile terminal, thereby realizes rapid, the switching in time of high speed mobile terminal, improves handover success rate.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the cell switching control method of a high speed mobile terminal, it is characterized in that: this method comprises that the motion that is higher than set point with translational speed when terminal is during away from Current Serving BTS, convergence scheduled target sub-district, network side judges whether the signal of Target cell satisfies the pre-switch condition, and when satisfying switching condition, start pre-switch, set up channel at Target cell.
2. the cell switching control method of high speed mobile terminal as claimed in claim 1, it is characterized in that: network side is after Target cell is set up channel, whether the signal that continues the detection Target cell satisfies switching condition, and carries out the sub-district switching when satisfying switching condition.
3. the cell switching control method of high speed mobile terminal as claimed in claim 2 is characterized in that: when network side does not satisfy switching condition at the signal that detects Target cell, wait for, as still not satisfying switching condition, then discharge the Target cell channel.
4. the cell switching control method of high speed mobile terminal as claimed in claim 1 is characterized in that: network side preservation sub-district neighborhood region correlation chart, switch the cell id that leaves to carry out the judgement of terminal moving direction by the record terminal.
5. the cell switching control method of high speed mobile terminal as claimed in claim 4 is characterized in that: network side is estimated the Target cell that terminal will enter according to sub-district neighborhood region correlation chart and terminal moving direction.
6. the cell switching control method of high speed mobile terminal as claimed in claim 1, it is characterized in that: terminal is in real time to the network reporting measurement reports, its measurement report content comprises the incoming level Rx of terminal, the level of this sub-district and the level of adjacent area, and network side can calculate the translational speed of terminal according to the measurement report of terminal to report.
7. the cell switching control method of high speed mobile terminal as claimed in claim 6, it is characterized in that: network side is according to the translational speed of radio transmission model computing terminal, and its formula is as follows
Rx1＝Tx-Ld1
Rx2＝Tx-Ld2
Ld＝69.55+26.161g(f)-13.821g(hb)+(44.9-6.551g(hb))lgd-A
Tx is base station transmitting power (known) in the formula
F is system works frequency (known)
Hb is a base station antenna height, according to the experience value
D is the distance (wait ask) of base station to travelling carriage
A is the travelling carriage height correction, according to the experience value
Network side can be according to Rx and Ld formula, calculate the base station to travelling carriage apart from d, and then calculate travelling carriage speed V=(d2-d1)/t, wherein t is the time interval of terminal through two distance calculation points.
8. the cell switching control method of high speed mobile terminal as claimed in claim 6 is characterized in that: whether network side can be analyzed the adjacent area level according to the measurement report of terminal to report satisfy pre-switch condition and handoff threshold condition.
9. as the cell switching control method of claim 1,4,5 or 8 described high speed mobile terminals, it is characterized in that: described preset value, pre-switch condition and switching condition are generally experience and set, and wherein pre-switch condition and switching condition refer to the thresholding of handover operation separately.
10. as the cell switching control method of any described high speed mobile terminal of claim 1 to 8, it is characterized in that: described method is applied in the sub-district switching controls of chain type overlay network.
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| CNB2006100346753A CN100461959C (en) | 2006-03-24 | 2006-03-24 | Cell switching control method of high speed moving terminal |
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| CNB2006100346753A CN100461959C (en) | 2006-03-24 | 2006-03-24 | Cell switching control method of high speed moving terminal |
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| CN110035451A (en) * | 2018-01-11 | 2019-07-19 | 惠州Tcl移动通信有限公司 | Communication handover method and communication switching device |
| WO2019136827A1 (en) * | 2018-01-11 | 2019-07-18 | Jrd Communication (Shenzhen) Ltd | Communication handover method and apparatus |
| CN110139312A (en) * | 2018-02-02 | 2019-08-16 | 中国移动通信集团设计院有限公司 | Determine method, apparatus, electronic equipment and the storage medium of highway user |
| CN110139312B (en) * | 2018-02-02 | 2022-06-03 | 中国移动通信集团设计院有限公司 | Method, device, electronic equipment and storage medium for determining highway users |
| CN111954284A (en) * | 2020-08-24 | 2020-11-17 | 珠海格力电器股份有限公司 | Method and system for accessing mobile terminal to network, communication base station and server |
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