CN101400133A - Wireless resource distributing method and system - Google Patents
Wireless resource distributing method and system Download PDFInfo
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- CN101400133A CN101400133A CNA2007101754294A CN200710175429A CN101400133A CN 101400133 A CN101400133 A CN 101400133A CN A2007101754294 A CNA2007101754294 A CN A2007101754294A CN 200710175429 A CN200710175429 A CN 200710175429A CN 101400133 A CN101400133 A CN 101400133A
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Abstract
The invention discloses a wireless resource distribution method and a system of realizing the wireless resource distribution. In a catenulate mobile communication system of the base station, according to the position and the motion direction of the measured users, the user terminal with the same position and/or motion direction is distributed in the same group of time slot, thereby reducing probability that signals with opposite doppler frequency shift are present in the same group of time slot, ensuring receiving demodulation performance, and ensuring quality of the received signals of the user terminal. In the invention, a plurality of cocurrent antennas but not opposite antennas are arranged on each base station, thereby the doppler frequency shift of the received signals can not change frequently between the largest positive and negative values when the user terminal moves in the district, moreover, the signals with opposite frequency shift and the same energy are avoided receiving in the same time slot, furthermore ensuring the quality of the received signals of the user terminal.
Description
Technical field
The present invention relates to wireless resource distributing techniques, particularly the base station is set to the mobile communication system that a kind of wireless resource allocation methods in the mobile communication system of chain structure and a kind of base station are set to chain structure and realize allocation of radio resources.
Background technology
In general, wireless communication system carries out allocation of radio resources based on factors such as type of service, interference, load, capacity.For example, the user terminal with corresponding identical services type is distributed on the same group of time slot.
Yet under some special screne, adopt the aforesaid way distributing radio resource may have following problem:
With the wireless communication system of serving high-speed railway is example, and the base station in this system promptly is set to chain along the high-speed railway sequence arrangement, to cover the whole piece high-speed railway.
Fig. 1 is the schematic diagram of the coverage mode of existing a kind of base station chain distribution.As shown in Figure 1, this coverage mode adopts macro base station+reverse high-gain aerial, and each base station only disposes a sub-district, introduces the reverse antenna of two width of cloth by power splitter, covers two opposite directions of high-speed railway respectively, referring to base station NB1 and the NB2 among Fig. 1.Under this coverage mode, suppose that the user terminal in the train moves on the direction of motion as shown in Figure 1, from entering the sub-district of NB1, the Doppler frequency shift of user terminal received signal will be from positive maximum frequency shift+f
MaxBe reduced to 0, change to negative maximum frequency shift-f from 0 then
MaxWhen the user terminal in this train when switching to the sub-district of NB2, Doppler frequency shift can be from negative maximum frequency shift-f
MaxBecome positive maximum frequency shift+f
Max, then from positive maximum frequency shift+f
MaxChange to 0, change to negative maximum frequency shift-f from 0 again
Max
Like this, according to existing wireless resource allocation methods, suppose the user terminal of corresponding identical services type is distributed in same time slot, then since the Doppler frequency shift of each user terminal received signal on the train in continuous variation, thereby the Doppler frequency shift of received signal of user terminal that same time slot probably can occur being distributed in is opposite fully, thereby have a strong impact on the receiving demodulation performance, make that the received signal quality of user terminal is not high.
Fig. 2 is the schematic diagram of the coverage mode of existing another kind of base station chain distribution.As shown in Figure 2, this coverage mode adopts Base Band Unit (BBU)+radio frequency to zoom out (RRU)+many reverse antennas, and many reverse antennas that belong to same base station all belong to a sub-district, referring to base station NB1 and the NB2 among Fig. 2.Under this coverage mode, suppose that the user terminal in the train moves on the direction of motion as shown in Figure 2, from entering the sub-district of NB1, the Doppler frequency shift of user terminal received signal will be from positive maximum frequency shift+f
MaxBe reduced to 0, change to negative maximum frequency shift-f from 0 then
Max, again from negative maximum frequency shift-f
MaxChange to positive maximum frequency shift+f
Max, then from positive maximum frequency shift+f
MaxChange to 0 again, change to negative maximum frequency shift-f from 0 again then
MaxWhen the user terminal in this train when switching to the sub-district of NB2, Doppler frequency shift can be from negative maximum frequency shift-f
MaxChange to positive maximum frequency shift+f
Max, then from positive maximum frequency shift+f
MaxChange to 0, change to negative maximum frequency shift-f again
Max
With as shown in Figure 1 coverage mode in like manner, under coverage mode as shown in Figure 2, according to existing wireless resource allocation methods, suppose the user terminal of corresponding identical services type is distributed in same time slot, the Doppler frequency shift of received signal of user terminal that same time slot then also probably can occur being distributed in is opposite fully, thereby have a strong impact on the receiving demodulation performance, make that the received signal quality of user terminal is not high.And at the covering crossover region of two reverse antennas of same base station, opposite fully and energy is basic identical from the Doppler frequency shift of the signal of two reverse antennas respectively, this can cause the frequency offset estimating error very big, more seriously influences the receiving demodulation performance.
As seen, in the existing mobile communication system that distributes based on the base station chain, because user terminal is in high-speed motion state usually, and there is bigger Doppler frequency shift down in this state.And existing wireless resource allocation methods does not have to consider to receive the situation of two antipodal signals of frequency displacement in same time slot, thereby makes the received signal quality of user terminal to be guaranteed.
Summary of the invention
In view of this, the invention provides a kind of wireless resource allocation methods and a kind of system that realizes allocation of radio resources, can guarantee the received signal quality of user terminal.
A kind of wireless resource allocation methods provided by the invention, the base station in the system is set to chain structure, and this method comprises:
Measure the position and the direction of motion of user terminal;
According to the position and the direction of motion of the user terminal that measures, position and/or the identical user terminal of the direction of motion are distributed in same group of time slot.
The position of described measurement user terminal comprises:
Judge the position of user terminal based on angle of arrival AOA information;
And/or, judge the position of user terminal based on the power maximum antenna position of the antenna receiving port on the base station.
The direction of motion of described measurement user terminal comprises:
Judge the direction of motion of user terminal based on AOA change in information trend;
And/or, judge the direction of motion of user terminal based on the variation tendency of the path loss of user terminal;
And/or, judge the direction of motion of user terminal based on the positive and negative and variation tendency of Doppler frequency shift.
Position and/or the identical user terminal of the direction of motion are distributed in same group of time slot to be comprised:
Preferentially the position and/or the identical user terminal that moves are distributed on the same group of time slot;
If the time interval resource deficiency is then preferentially divided the immediate user terminal of Doppler frequency shift on same group of time slot.
Execution is described when switching in the sub-district is distributed in same group of time slot with position and/or the identical user terminal of the direction of motion.
Described position and/or the identical user terminal of the direction of motion are distributed in after the same group of time slot, this method further comprises:
Whether the position and/or the direction of motion that periodically detect the user terminal that is distributed in each time slot is identical, if, then keep current resource allocation result constant, otherwise, user terminal adjustment in this time slot is assigned to other time slots, identical to satisfy the position and/or the direction of motion that are distributed in the user terminal on this time slot.
Base station in the described system is set to chain structure and further comprises: for each base station is provided with a plurality of antennas in the same way.
Base station in the described system is set to chain structure and further comprises: for each base station is provided with a sub-district.
A kind of system that realizes allocation of radio resources provided by the invention comprises: comprise base station, RNC and user terminal, each base station is set to chain structure,
Described base station is used to measure the position and the direction of motion of user terminal, and reports described RNC;
Described RNC is used for the position and the direction of motion according to the user terminal that measures, preferentially position and/or the identical user terminal of the direction of motion is distributed in same group of time slot.
A plurality of antennas in the same way are set on each base station.
As seen from the above technical solution, the present invention is in the mobile communication system of base station chain, measure the position and the direction of motion of user terminal, and according to the position and the direction of motion of the user terminal that measures, position and/or the identical user terminal of the direction of motion are distributed in same group of time slot, thereby can be reduced in the probability that occurs the antipodal signal of Doppler frequency shift on the same group of time slot greatly, reduced the interference between user terminal, guarantee the receiving demodulation performance, thereby guaranteed the received signal quality of user terminal.And allocation of radio resources scheme provided by the invention realizes simple, is easy to promote.
In the present invention, a plurality of antennas in the same way rather than reverse antenna are set on each base station, thereby make when user terminal moves in the sub-district, the Doppler frequency shift of received signal can be between positive and negative maximum frequent variations, and, the opposite fully and essentially identical signal of energy of Doppler frequency shift from two antennas also can not appear, promptly avoid in same time slot, receiving the opposite fully and essentially identical signal of energy of two frequency displacements fully, thereby further guaranteed the received signal quality of user terminal.
Description of drawings
Fig. 1 is the schematic diagram of the coverage mode of existing a kind of base station chain distribution.
Fig. 2 is the schematic diagram of the coverage mode of existing another kind of base station chain distribution.
Fig. 3 is the schematic flow sheet of wireless resource allocation methods among the present invention.
Fig. 4 is the schematic diagram of the coverage mode of a kind of base station chain distribution among the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Among the present invention, consider influences such as the frequency displacement of user terminal in the mobile communication system that the base station chain distributes and sub-district switching, therefore, carry out allocation of radio resources based on factors such as the position of user terminal and the directions of motion.
Specifically, can carry out allocation of radio resources based on following principle:
1, the preferential user terminal that the position is identical is distributed on the same group of time slot.Wherein, identical being meant in the position of indication belongs to the same position zone here, and for example, all user terminals on the same train can be regarded the user terminal that the position is identical as, can be distributed on the same group of time slot.
Wherein, only need guarantee in the above-mentioned band of position, can not exist the antipodal signal of Doppler frequency shift to get final product.Like this, because the received signal of the portable terminal of diverse location may have different Doppler frequency shifts, therefore, the user terminal that the position is identical is distributed on the same group of time slot, can guarantee on same group of time slot, can not occur substantially the antipodal signal of Doppler frequency shift, thereby reduced interference between user terminal, guarantee the receiving demodulation performance, thereby guaranteed the received signal quality of user terminal.
2, the preferential user terminal that the direction of motion is identical is distributed on the same group of time slot.
Wherein, the direction of motion of indication comprises the absolute movement direction and with respect to the direction of relative movement of base station (away from the base station or near the base station) here.
Same position zone in the sub-district, the Doppler frequency shift of the user terminal on the different absolute movement directions (when for example two row train reverse drivings meet) also inequality.If the preferential user terminal that the absolute movement direction is identical is distributed on the same group of time slot, thereby can be reduced in the probability that occurs the antipodal signal of Doppler frequency shift on the same group of time slot greatly, reduced the interference between user terminal, guarantee the receiving demodulation performance, thereby guaranteed the received signal quality of user terminal.
If preferentially will be distributed on the same group of time slot by identical user terminal with respect to the direction of motion of base station, promptly at having now as Fig. 1 with as two kinds of coverage modes of Fig. 2, the user terminal consistent with the base station relative motion is distributed on the same group of time slot, guarantee that then received signal has the user terminal branch of positive Doppler frequency shift on same group of time slot, the user terminal that received signal has negative Doppler frequency shift is distributed on another group time slot, thereby also can be reduced in the probability that occurs the antipodal signal of Doppler frequency shift on the same group of time slot greatly, reduced the interference between user terminal, guarantee the receiving demodulation performance, thereby guaranteed the received signal quality of user terminal.
If 3 time interval resource deficiencies are then preferentially divided the immediate user terminal of Doppler frequency shift on same group of time slot.
4, carrying out dynamic channel when adjusting, preferentially identical but user terminal negligible amounts is adjusted on other the time slot with position and/or the direction of motion.
Like this, distributing radio resource in the manner described above, be actual environment fully at the mobile communication system of special screnes such as for example base station chain distribution, rather than only consider factors such as type of service, thereby can avoid in same time slot, receiving two antipodal signals of frequency displacement as much as possible, to guarantee the received signal quality of user terminal.
In the practical application, measure position, the direction of motion of user terminal, can realize according to the mode of one of the following or combination in any:
1, judge the position of user terminal based on the angle of arrival (AOA) information, AOA information can reflect the signal arrival bearing of user terminal; Judge that based on AOA change in information trend the direction of motion of user terminal, AOA change in information trend can reflect that user terminal is near the direction motion of base station or to the direction motion away from the base station.
2 judge the direction of motion of user terminal based on the variation tendency of the path loss of user terminal, and the road can reflect that through the variation tendency of loss user terminal is near the direction motion of base station or to the direction motion away from the base station.
3 judge the position of user terminal based on the power maximum antenna position of antenna receiving port, and the receiving port power of which slave antenna is big, and then user terminal is promptly in the coverage of this slave antenna.
4 judge the direction of motion of user terminal based on the positive and negative and variation tendency of Doppler frequency shift.
Based on the metering system of principle and the user terminal location and the direction of motion of above-mentioned allocation of radio resources, can realize wireless resource allocation methods provided by the present invention.
Fig. 3 is the schematic flow sheet of wireless resource allocation methods among the present invention.As shown in Figure 3, the wireless resource allocation methods among the present invention may further comprise the steps:
In this step, according to the power maximum antenna position of AOA information or antenna receiving port, can know the position of user terminal in the sub-district, user terminal is in the coverage of which slave antenna of base station;
According to the variation tendency of AOA change in information trend or path loss or the positive and negative and variation tendency of Doppler frequency shift, can know the direction of motion of user terminal.
Step 302 according to the position and the direction of motion of the user terminal that measures, preferentially is distributed in same group of time slot with position and/or the identical user terminal of the direction of motion.
For example, the user terminal on same train, the position and the direction of motion of its measurement are basic identical, then it can be distributed on the same group of time slot; User terminal on the train on the different motion direction, the direction of motion difference of its measurement then is distributed in the user terminal on the different motion direction train not on the time slot on the same group; In the same direction of motion, the user terminal on the different trains also is distributed on the different time-gap as far as possible, if the time interval resource deficiency then is distributed in the user on the same direction of motion on the same group of time slot as far as possible.
So far, promptly realized the allocation of radio resources among the present invention.
Alternatively, after above-mentioned steps 302, measurement result based on the foregoing user terminal location and the direction of motion, periodically detect each time slot and whether satisfy allocation of radio resources principle among the present invention, if the position and/or the direction of motion of the user terminal in each time slot are all identical, then keep current resource allocation result constant; If the continuous several subframes of certain time slot do not satisfy mentioned above principle, then carry out the dynamic resource adjustment, certain customers' terminal adjustment in this time slot is assigned to other time slots, so that adjusted each time slot satisfies mentioned above principle, it is identical promptly to satisfy the position and/or the direction of motion that are distributed in the user terminal on this time slot.
Above-mentioned flow process can be carried out when carrying out the minizone switching at every turn, to guarantee all to avoid receiving two antipodal signals of frequency displacement in each sub-district in same time slot, to guarantee the received signal quality of user terminal.
In order to eliminate the opposite fully and essentially identical signal of energy of frequency displacement, to avoid in same time slot, the receiving opposite fully and essentially identical signal of energy of two frequency displacements, the coverage mode that provides a kind of base station chain to distribute among the present invention, this mode are different from existing as Fig. 1 and coverage mode as shown in Figure 2.
Fig. 4 is the schematic diagram of the coverage mode of a kind of base station chain distribution among the present invention.As shown in Figure 4, the present invention is for fear of the situation that has the positive and negative frequent variations of Doppler frequency shift in the coverage mode now, adopt the coverage mode of antenna in the same way, promptly with many in the same way antenna substitute as shown in Figure 2 many reverse antennas, promptly can adopt BBU+RRU+ antenna in the same way.
Under this coverage mode, on the same direction of motion, positive and negative variation can not take place in Doppler frequency shift.Suppose that user terminal moves on the direction of motion as shown in Figure 4, Doppler frequency shift only can be at positive maximum frequency shift+f
MaxAnd change between 0, and the maximum frequency shift-f that can not occur bearing
Max
Like this, in flow process as shown in Figure 3, as long as the user terminal on the different motion direction is distributed on the different time slots, just can avoid occurring in the same time slot the antipodal signal of Doppler frequency shift, thereby avoid the received signal of different user terminals to influence each other, to guarantee the receiving demodulation performance.And, in coverage mode as shown in Figure 4, the interior opposite fully and essentially identical signal of energy of Doppler frequency shift that occurs from two antennas of covering crossover region that does not also have two reverse antennas of same base station, promptly avoid in same time slot, receiving the opposite fully and essentially identical signal of energy of two frequency displacements fully, thereby guaranteed the received signal quality of user terminal.
Based on as shown in Figure 4 BBU+RRU+ antenna coverage mode in the same way, in the step 301 of flow process as shown in Figure 3,, can also distinguish the user terminal on the different trains on the same direction of motion according to the power maximum antenna position of antenna receiving port.For example, on the same direction of motion, on the antenna of two parafacies in the same sub-district so far apart (as above 200 meters) very strong received power is arranged all, then explanation has two trains in the same way.Thereby further the position of different user terminals is distinguished on refinement ground.
Based on said method, the present invention also provides a kind of system that realizes allocation of radio resources, and this system comprises: base station, RNC and user terminal.
Wherein, each base station in this system is set to chain structure, and for each base station is provided with a sub-district, this chain structure can adopt the coverage mode shown in Fig. 1,2 or 4.
The base station is used for the metrical information that the position of user terminal is relevant with the direction of motion and reports RNC.
The concrete position and the metering system of the direction of motion, method realizes as described above.
RNC is used for the position and the direction of motion according to the user terminal that measures, preferentially position and/or the identical user terminal of the direction of motion is distributed in same group of time slot.
Concrete allocation of radio resources mode also as described above method realize.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of wireless resource allocation methods, the base station in the system is set to chain structure, it is characterized in that, and this method comprises:
Measure the position and the direction of motion of user terminal;
According to the position and the direction of motion of the user terminal that measures, position and/or the identical user terminal of the direction of motion are distributed in same group of time slot.
2, the method for claim 1 is characterized in that, the position of described measurement user terminal comprises:
Judge the position of user terminal based on angle of arrival AOA information;
And/or, judge the position of user terminal based on the power maximum antenna position of the antenna receiving port on the base station.
3, method as claimed in claim 2 is characterized in that, the direction of motion of described measurement user terminal comprises:
Judge the direction of motion of user terminal based on AOA change in information trend;
And/or, judge the direction of motion of user terminal based on the variation tendency of the path loss of user terminal;
And/or, judge the direction of motion of user terminal based on the positive and negative and variation tendency of Doppler frequency shift.
4, as any described method in the claim 1 to 3, it is characterized in that, position and/or the identical user terminal of the direction of motion be distributed in same group of time slot comprise:
Preferentially the position and/or the identical user terminal that moves are distributed on the same group of time slot;
If the time interval resource deficiency is then preferentially divided the immediate user terminal of Doppler frequency shift on same group of time slot.
As any described method in the claim 1 to 3, it is characterized in that 5, execution is described when switching in the sub-district is distributed in same group of time slot with position and/or the identical user terminal of the direction of motion.
As any described method in the claim 1 to 3, it is characterized in that 6, described position and/or the identical user terminal of the direction of motion are distributed in after the same group of time slot, this method further comprises:
Whether the position and/or the direction of motion that periodically detect the user terminal that is distributed in each time slot is identical, if, then keep current resource allocation result constant, otherwise, user terminal adjustment in this time slot is assigned to other time slots, identical to satisfy the position and/or the direction of motion that are distributed in the user terminal on this time slot.
7, as any described method in the claim 1 to 3, it is characterized in that the base station in the described system is set to chain structure and further comprises: for each base station is provided with a plurality of antennas in the same way.
8, method as claimed in claim 7 is characterized in that, the base station in the described system is set to chain structure and further comprises: for each base station is provided with a sub-district.
9, a kind of system that realizes allocation of radio resources comprises base station, RNC and user terminal, and each base station is set to chain structure, it is characterized in that,
Described base station is used to measure the position and the direction of motion of user terminal, and reports described RNC;
Described RNC is used for the position and the direction of motion according to the user terminal that measures, preferentially position and/or the identical user terminal of the direction of motion is distributed in same group of time slot.
10, system as claimed in claim 9 is characterized in that, a plurality of antennas in the same way are set on each base station.
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| CNA2007101754294A CN101400133A (en) | 2007-09-29 | 2007-09-29 | Wireless resource distributing method and system |
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| CNA2007101754294A CN101400133A (en) | 2007-09-29 | 2007-09-29 | Wireless resource distributing method and system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102118762A (en) * | 2011-04-01 | 2011-07-06 | 北京邮电大学 | One-way coverage scheme of wireless communication network for high-speed railway |
| WO2012146187A1 (en) * | 2011-04-26 | 2012-11-01 | 华为技术有限公司 | Clock synchronization processing method, device and communication system |
| CN102970731A (en) * | 2012-11-08 | 2013-03-13 | 京信通信系统（中国）有限公司 | Wireless access method, wireless access system and wireless access device |
| WO2013071490A1 (en) * | 2011-11-15 | 2013-05-23 | 中兴通讯股份有限公司 | System and method for achieving wireless mobile communication network coverage |
| CN105050141A (en) * | 2015-08-13 | 2015-11-11 | 京信通信技术(广州)有限公司 | Cell handover method and base station thereof |
| WO2017076348A1 (en) * | 2015-11-05 | 2017-05-11 | 电信科学技术研究院 | Resource scheduling method and device of vehicle-road cooperative communication system, and nodes |
| CN109348414A (en) * | 2018-11-30 | 2019-02-15 | 中国联合网络通信集团有限公司 | The method and apparatus in lane where positioning vehicle |
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- 2007-09-29 CN CNA2007101754294A patent/CN101400133A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118762A (en) * | 2011-04-01 | 2011-07-06 | 北京邮电大学 | One-way coverage scheme of wireless communication network for high-speed railway |
| WO2012146187A1 (en) * | 2011-04-26 | 2012-11-01 | 华为技术有限公司 | Clock synchronization processing method, device and communication system |
| WO2013071490A1 (en) * | 2011-11-15 | 2013-05-23 | 中兴通讯股份有限公司 | System and method for achieving wireless mobile communication network coverage |
| CN102970731A (en) * | 2012-11-08 | 2013-03-13 | 京信通信系统（中国）有限公司 | Wireless access method, wireless access system and wireless access device |
| CN102970731B (en) * | 2012-11-08 | 2016-04-06 | 京信通信系统（中国）有限公司 | A kind of radio switch-in method, system and equipment |
| CN105050141A (en) * | 2015-08-13 | 2015-11-11 | 京信通信技术(广州)有限公司 | Cell handover method and base station thereof |
| CN105050141B (en) * | 2015-08-13 | 2019-01-18 | 京信通信系统（中国）有限公司 | A kind of cell switching method and its base station |
| WO2017076348A1 (en) * | 2015-11-05 | 2017-05-11 | 电信科学技术研究院 | Resource scheduling method and device of vehicle-road cooperative communication system, and nodes |
| US10602524B2 (en) | 2015-11-05 | 2020-03-24 | China Academy Of Telecommunications Technology | Resource scheduling method and device for vehicle infrastructure cooperative communication system, and node of vehicle infrastructure cooperative communication system |
| CN109348414A (en) * | 2018-11-30 | 2019-02-15 | 中国联合网络通信集团有限公司 | The method and apparatus in lane where positioning vehicle |
| CN109348414B (en) * | 2018-11-30 | 2021-03-12 | 中国联合网络通信集团有限公司 | Method and equipment for positioning lane where vehicle is located |
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Application publication date: 20090401 |