CN101730240A - Method for selecting access carrier of N-frequency point cell - Google Patents
Method for selecting access carrier of N-frequency point cell Download PDFInfo
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- CN101730240A CN101730240A CN200810224430A CN200810224430A CN101730240A CN 101730240 A CN101730240 A CN 101730240A CN 200810224430 A CN200810224430 A CN 200810224430A CN 200810224430 A CN200810224430 A CN 200810224430A CN 101730240 A CN101730240 A CN 101730240A
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Abstract
The invention discloses a method for selecting an access carrier of an N-frequency point cell, which comprises: dividing the N carriers of the N-frequency point cell into two classes, namely full coverage carriers covering the whole cell and central coverage carriers covering only the central area of the cell in advance, wherein the full coverage carriers comprise the main carrier of the N-frequency point cell; determining the ratio flag2 of the number of the neighboring cells having a frequency different from that of the current cell to the number of the total number of the neighboring cells of the current cell; when UE selects an access carrier, calculating the priority of each carrier according to the residual physical resource, uplink interference level and the flag2 of each of the N carriers; determining a candidate access carrier group according to the priority of each carrier and selecting the carrier according to a priority sequence from high to low of the carriers in the candidate access carrier group; and allowing the UE to access the selected carrier in a time slot when the interference is the smallest. The method of the invention can realize the load balance of the carriers of the N-frequency point cell and improve system capacity.
Description
Technical field
The present invention relates to carrier wave selection technology, the system of selection of access carrier in particularly a kind of N frequency point cell.
Background technology
Be the demand of big capacity and part high-speed data service among the adaptation mobile network, introduce the notion of N frequency point cell among the TD-SCDMA.In the N frequency point cell, (sector) has a plurality of carrier frequency to exist in the same overlay area, and determines one as main carrier frequency from N the frequency that is assigned to, and all the other frequencies are divided into assistant carrier frequency.In same sector, only on main carrier frequency, send DwPTS and broadcast message, and common signal channel is limited on the main carrier frequency, when between the carrier frequency that has reduced common signal channel, disturbing, improved power system capacity in the overlay area.
In the N frequency point cell, UE initially inserts and switching when entering the sub-district, needs to select a carrier wave to insert.At present, select candidate carrier generally to be based on residue RU number, promptly which carrier wave how the residue RU number on which carrier wave just insert.But under some networking scene, this carrier selecting method can cause the actual load difference of intercarrier very big, and the user QoS difference on the different carrier is very big, influences capacity and user's impression of system.
Summary of the invention
In view of this, the invention provides the system of selection of access carrier in a kind of N frequency point cell, can realize the load balancing of intercarrier in the N frequency point cell, improve power system capacity.
For achieving the above object, the present invention adopts following technical scheme:
The system of selection of access carrier in a kind of N frequency point cell comprises:
N carrier wave with the N frequency point cell is divided into two classes in advance, is respectively to cover all standing carrier wave of whole sub-district and the center covering carrier wave of coverage cell center only; Described all standing carrier wave comprises the main carrier of described N frequency point cell;
Determine that the alien frequencies adjacent area number of current area accounts for the ratio flag2 of total adjacent area number;
When UE selects access carrier,, calculate the priority of each carrier wave according to residue physical resource and the uplink interference level and the described flag2 of each carrier wave in the described N carrier wave;
Determine candidate's access carrier group according to the priority of each carrier wave, and according to the priority selective sequential carrier wave from high to low of each carrier wave in candidate's access carrier group;
UE selects to disturb minimum time slot to insert on the carrier wave of selecting.
Preferably, described residue physical resource and uplink interference level and described flag2 according to each carrier wave, the priority of calculating each carrier wave is: priority=flag2*a* (b * residue physical resource/interference)+(1-flag2) * (b * residue physical resource/interference), wherein, described interference is the minimum value of each time slot interference on this carrier wave, described residue physical resource is for disturbing the residue RU number on the minimum time slot, and a and b are default parameter, and a is not less than 1.
Preferably, described a is big more, and disturbing factor weight in priority is calculated is big more; Described b is big more, and surplus resources factor weight in priority is calculated is big more.
Preferably, described priority according to each carrier wave determines that candidate's access carrier group comprises: priority is formed candidate's access carrier group greater than all standing carrier wave of the first default thresholding.
Preferably, when not existing priority to preset all standing carrier wave of thresholding greater than first, this method further comprises: priority is formed candidate's access carrier group greater than the center covering carrier wave of the second default thresholding, and according to the priority order assignment carrier wave from high to low of each carrier wave in candidate's access carrier group, wherein, the first default thresholding is more than or equal to the second default thresholding.
Preferably, when the center that does not exist priority greater than the second default thresholding covers carrier wave, this method further comprises: all N carrier waves are formed candidate's access carrier groups, and according to the priority selective sequential carrier wave from high to low of each carrier wave in candidate's access carrier group.
As seen from the above technical solution, among the present invention, N carrier wave with the N frequency point cell is divided into two classes in advance, is respectively to cover all standing carrier wave of whole sub-district and the center covering carrier wave of coverage cell center only; Described all standing carrier wave comprises the main carrier of described N frequency point cell; Determine that the alien frequencies adjacent area number of current area accounts for the ratio flag2 of total adjacent area number; When UE selects access carrier,, calculate the priority of each carrier wave according to residue physical resource and the uplink interference level and the described flag2 of each carrier wave in the described N carrier wave; Determine candidate's access carrier group according to the priority of each carrier wave, and according to the priority selective sequential carrier wave from high to low of each carrier wave in candidate's access carrier group; UE selects to disturb minimum time slot to insert on the carrier wave of selecting.By the present invention, determine priority according to the residue physical resource and the uplink interference level of each carrier wave, and on this basis for UE selects access carrier, thereby can guarantee the load balancing of each intercarrier in the N frequency point cell.
Description of drawings
Fig. 1 is the overview flow chart of the access carrier system of selection of N frequency point cell among the present invention.
Fig. 2 is the particular flow sheet of the carrier selecting method of N frequency point cell among the present invention.
Carrier wave when Fig. 3 a presets thresholding for all standing carrier wave priority in the example of the present invention greater than first is selected schematic diagram.
Carrier wave when Fig. 3 b covers carrier wave priority greater than the second default thresholding for all standing carrier wave priority in the example of the present invention is less than or equal to the first default thresholding and center is selected schematic diagram.
Carrier wave when Fig. 3 c is less than or equal to the second default thresholding for center in the example of the present invention covers carrier wave priority is selected schematic diagram.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, below in conjunction with accompanying drawing the present invention is done to describe in further detail.
Basic thought of the present invention is: take all factors into consideration residue physical resource, uplink interference level on the carrier wave, reasonable distributing user on carrier wave can both maximized system capacity under various networking scene.
Fig. 1 is the overview flow chart of the access carrier system of selection of N frequency point cell among the present invention.As shown in Figure 1, this method comprises:
In the method for the invention, keep N frequency point cell fundamental characteristics, be about to common signal channel and only be configured on the main carrier of N frequency.During the network planning, in arbitrary cells, the selection portion sub-carrier covers whole sub-district from the N frequency, and these carrier waves are called all standing carrier wave; The covering radius of all the other carrier waves in the sub-district is shunk, coverage cell center only, i.e. this type of carrier wave discontinuous covering in network is called the center and covers carrier wave.
Particularly, for guaranteeing in the N frequency point co-frequency network that for all users provide normal down-going synchronous, broadcasting and public service, all standing carrier wave comprises the main carrier of this sub-district.Simultaneously, according to the network planning needs of reality, all standing carrier wave also can comprise one or more auxilliary carrier waves.Carrying out the branch time-like of N carrier wave, can divide arbitrarily according to actual needs.
Flag2 equals 1 and represents that the adjacent area is alien frequencies entirely on every side, equals 0 and represents that the adjacent area is that the flag2 value shows alien frequencies adjacent area dense degree on every side between 0 and 1 with frequency entirely on every side.For example there are 6 adjacent areas the sub-district, wherein has three to be alien frequencies, and then Flag2 is 0.5.
So far, access carrier system of selection flow process provided by the invention finishes.Below by specific embodiment specific implementation of the present invention is described.
Fig. 2 is the particular flow sheet of the carrier selecting method of N frequency point cell among the present invention.As shown in Figure 2, this method comprises:
In this step, in the N frequency point cell, carry out the carrier wave setting in advance.One or more carrier waves are set are used for covering continuously, be called all standing carrier wave, the covering that one or more carrier waves are set is shunk, and is called the center and covers carrier wave.
The sign that all standing carrier wave and center cover carrier wave is designated as flag1, and it is all standing carrier wave that flag1 equals 1 expression, and flag1 equals 0 expression center and covers carrier wave.
In this step, determine all standing carrier frequency relation of current area and neighbor cell.So-called alien frequencies adjacent area is meant that all standing carrier wave of neighbor cell is different with all standing carrier wave of current area, and so-called homogeneous-frequency adjacent-domain is meant that all standing carrier wave of neighbor cell is identical with all standing carrier wave of current area.
When UE selects access carrier, carry out following steps:
Carrier wave priority depends on the residue physical resource and the uplink interference level of carrier wave.Base station server divides the time slot record to upgrade the residue physical resource and the uplink interference level of each carrier wave of back at each TTI, wherein, the interference of carrier wave is defined as the minimum value of each time slot interference on the carrier wave, and the residue physical resource is meant the residue RU number that disturbs on the minimum time slot.
Calculate carrier wave priority concrete mode can for:
Priority=flag2*a* (b * residue physical resource/interference)+(1-flag2) * (b * residue physical resource/interference) (1)
Wherein, a and b are the parameters of presetting, and a is not less than 1.In more detail, a is used to improve the priority that the adjacent area all is the carrier wave of alien frequencies, and a is big more to show that the weight of disturbing factor in priority is calculated is big more; B is the parameter of adjusting the residue physical resource and disturbing both relative weightings, and b is big more, and the surplus resources factor that shows is big more to the weight in the priority calculating.
In the present embodiment, when priority is preset thresholding greater than first, show sub-district zero load or number of users seldom, at this moment preferably the user is inserted all standing carrier wave.Therefore, priority is preset the candidate carrier of all standing carrier wave of thresholding as limit priority greater than first.
When not existing priority greater than all standing carrier wave of the first default thresholding and when existing center greater than the second default thresholding to cover carrier wave, show that number of users in the sub-district increases but still in certain number of users scope, the load that the center covers carrier wave is lighter relatively, at this moment preferably user's access center is covered carrier wave.Therefore, priority is covered the candidate carrier of carrier wave as time high priority greater than second center of presetting thresholding.
When priority does not all exist greater than the full all standing carrier wave of the first default thresholding with greater than the second center covering carrier wave of presetting thresholding, show that number of users is many in the sub-district, the load that all standing carrier wave and center cover carrier wave is all heavier, at this moment, carry out the carrier wave selection according to the priority that each carrier wave calculates, wherein, the adjacent area all is that the carrier wave of alien frequencies has higher probability selected.
Select to disturb minimum time slot to insert the quality of reception that can effectively guarantee signal.
So far, the access carrier system of selection flow process in the embodiment of the invention finishes.
The all standing carrier wave shown in the invention described above embodiment and center cover carrier wave and the networking mode deposited under, for example, at S2/2/2 networking (alien frequencies between main carrier, auxilliary carrier wave all is with frequently) time, if carry out the carrier wave selection according to the residue RU method that background technology is described, statistics finds out that the actual load difference of carrier wave is very big, and auxilliary carrier wave is because co-channel interference causes the average of uplink interference and fluctuation all than big many of main carrier.If can realize the load balancing of intercarrier, all be beneficial to for improving power system capacity and improving user's impression.
In addition, in the networking shown in the foregoing description, if the initial access carrier of UE is selected according to the measured value of PCCPCHRSCP, RSCP covers carrier wave greater than certain thresholding UE with regard to the access center, if but do not have the user on all standing this moment carrier wave or disturb very little, insert all standing carrier wave and can obtain better QoS in fact, and behind the UE position change, switch without intercarrier; RSCP just inserts all standing carrier wave less than certain thresholding UE, if but this moment the center cover and do not have the user on the carrier wave or disturb very for a short time, the access center covers carrier wave and more helps guaranteeing user QoS and network performance.
By as seen above-mentioned, use method of the present invention after, under the framework of N frequency, load is distributed in that intercarrier is balanced: intercarrier load balancing, can the more efficient use interface-free resources; Improve user's QoS index, improve user's impression; Reduce switching times, thereby reduce switching arranged resources, improve power system capacity and KPI index; Reduce the difficulty of networking.
Provide an instantiation below.In one three carrier cell, selected carrier wave is as all standing carrier wave, and other two carrier waves cover carrier wave as the center, and the coverage schematic diagram of all standing carrier wave and all standing carrier wave has been shown in Fig. 3 a, 3b and 3c.
Parameter is set to: first in advance thresholding be that-1, the second default thresholding is-1.3, a=2, b=10.According to above-mentioned parameter, utilize formula (1) to calculate the priority of each carrier wave.
As sub-district zero load or user seldom the time, the priority of all standing carrier wave is greater than thresholding 1, and shown in Fig. 3 a, user priority is assigned on all standing carrier wave, and wherein, the grey rectangle frame table shows the user;
Number of users increases gradually, and the priority of all standing carrier wave is all less than behind the thresholding 1, and shown in Fig. 3 b, the user is covered on the carrier wave to the center by priority allocation, and wherein, the grey rectangle frame table shows the user;
Number of users continues to increase, and the center covers the priority of carrier wave all less than behind the thresholding 2, shown in Fig. 3 c, comes distributing carrier wave according to the priority that calculates, and the adjacent area all is that the carrier wave of alien frequencies has higher probability to be assigned with, and wherein, the grey rectangle frame table shows the user.
Being preferred embodiment of the present invention only below, 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 replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the system of selection of access carrier in the N frequency point cell is characterized in that this method comprises:
N carrier wave with the N frequency point cell is divided into two classes in advance, is respectively to cover all standing carrier wave of whole sub-district and the center covering carrier wave of coverage cell center only; Described all standing carrier wave comprises the main carrier of described N frequency point cell;
Determine that the alien frequencies adjacent area number of current area accounts for the ratio flag2 of total adjacent area number;
When UE selects access carrier,, calculate the priority of each carrier wave according to residue physical resource and the uplink interference level and the described flag2 of each carrier wave in the described N carrier wave;
Determine candidate's access carrier group according to the priority of each carrier wave, and according to the priority selective sequential carrier wave from high to low of each carrier wave in candidate's access carrier group;
UE selects to disturb minimum time slot to insert on the carrier wave of selecting.
2. method according to claim 1, it is characterized in that, described residue physical resource and uplink interference level and described flag2 according to each carrier wave, the priority of calculating each carrier wave is: priority=flag2*a* (b * residue physical resource/interference)+(1-flag2) * (b * residue physical resource/interference), wherein, described interference is the minimum value of each time slot interference on this carrier wave, described residue physical resource is for disturbing the residue RU number on the minimum time slot, a and b are default parameter, and a is not less than 1.
3. method according to claim 2 is characterized in that described a is big more, and disturbing factor weight in priority is calculated is big more; Described b is big more, and surplus resources factor weight in priority is calculated is big more.
4. according to arbitrary described method in the claim 1 to 3, it is characterized in that described priority according to each carrier wave determines that candidate's access carrier group comprises: priority is formed candidate's access carrier group greater than all standing carrier wave of the first default thresholding.
5. method according to claim 4, it is characterized in that, when not existing priority to preset all standing carrier wave of thresholding greater than first, this method further comprises: priority is formed candidate's access carrier group greater than the center covering carrier wave of the second default thresholding, and according to the priority order assignment carrier wave from high to low of each carrier wave in candidate's access carrier group, wherein, the first default thresholding is more than or equal to the second default thresholding.
6. method according to claim 5, it is characterized in that, when the center that does not exist priority greater than the second default thresholding covers carrier wave, this method further comprises: all N carrier waves are formed candidate's access carrier groups, and according to the priority selective sequential carrier wave from high to low of each carrier wave in candidate's access carrier group.
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| CN2008102244306A CN101730240B (en) | 2008-10-14 | 2008-10-14 | Method for selecting access carrier of N-frequency point cell |
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| CN2008102244306A CN101730240B (en) | 2008-10-14 | 2008-10-14 | Method for selecting access carrier of N-frequency point cell |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101867454A (en) * | 2010-06-10 | 2010-10-20 | 中兴通讯股份有限公司 | Selection method of signaling data bearing carrier wave and device |
| CN102316482A (en) * | 2010-07-08 | 2012-01-11 | 普天信息技术研究院有限公司 | Dynamic carrier management method |
| CN102325376A (en) * | 2011-09-09 | 2012-01-18 | 大唐移动通信设备有限公司 | Carrier resource distributing method and device |
| WO2012136131A1 (en) * | 2011-04-02 | 2012-10-11 | 华为技术有限公司 | Uplink access method and terminal device |
| CN102740359A (en) * | 2011-04-07 | 2012-10-17 | 中兴通讯股份有限公司 | Load balancing method and device |
| CN103856982A (en) * | 2012-12-03 | 2014-06-11 | 普天信息技术研究院有限公司 | Method for reducing downlink control channel disturbance |
| CN106817703A (en) * | 2016-12-16 | 2017-06-09 | 京信通信技术(广州)有限公司 | A kind of frequency optimization method and device |
| CN110474728A (en) * | 2018-05-11 | 2019-11-19 | 电信科学技术研究院有限公司 | A kind of synchronization message sends the selection method and terminal of carrier wave |
| CN112543507A (en) * | 2019-09-23 | 2021-03-23 | 成都鼎桥通信技术有限公司 | Carrier selection method, device, base station and storage medium based on uplink interference |
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| CN100421510C (en) * | 2005-02-23 | 2008-09-24 | 大唐移动通信设备有限公司 | Access priority oriented queuing method of TDD system under multi-frequency condition |
| CN101076181B (en) * | 2006-05-19 | 2011-01-19 | 中兴通讯股份有限公司 | Method for selecting access frequency point N frequency-point domain in TD-SCDMA system |
| KR100765892B1 (en) * | 2006-08-30 | 2007-10-10 | 주식회사 팬택 | Method of controlling inter-cell interference for a mobile communication system |
| CN101212788A (en) * | 2006-12-25 | 2008-07-02 | 中兴通讯股份有限公司 | Frequency point selector in N-frequency point cell system |
| CN101212763B (en) * | 2006-12-25 | 2011-05-25 | 中兴通讯股份有限公司 | Frequency point selection method in N-frequency point cell system |
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| CN101867454A (en) * | 2010-06-10 | 2010-10-20 | 中兴通讯股份有限公司 | Selection method of signaling data bearing carrier wave and device |
| CN101867454B (en) * | 2010-06-10 | 2015-06-03 | 中兴通讯股份有限公司 | Selection method of signaling data bearing carrier wave and device |
| CN102316482A (en) * | 2010-07-08 | 2012-01-11 | 普天信息技术研究院有限公司 | Dynamic carrier management method |
| WO2012136131A1 (en) * | 2011-04-02 | 2012-10-11 | 华为技术有限公司 | Uplink access method and terminal device |
| CN102740359A (en) * | 2011-04-07 | 2012-10-17 | 中兴通讯股份有限公司 | Load balancing method and device |
| CN102740359B (en) * | 2011-04-07 | 2016-03-30 | 中兴通讯股份有限公司 | Load-balancing method and device |
| CN102325376A (en) * | 2011-09-09 | 2012-01-18 | 大唐移动通信设备有限公司 | Carrier resource distributing method and device |
| CN103856982A (en) * | 2012-12-03 | 2014-06-11 | 普天信息技术研究院有限公司 | Method for reducing downlink control channel disturbance |
| CN103856982B (en) * | 2012-12-03 | 2017-05-31 | 普天信息技术研究院有限公司 | A kind of method for reducing down control channel interference |
| CN106817703A (en) * | 2016-12-16 | 2017-06-09 | 京信通信技术(广州)有限公司 | A kind of frequency optimization method and device |
| CN106817703B (en) * | 2016-12-16 | 2019-11-19 | 京信通信***（中国）有限公司 | A kind of frequency point optimization method and device |
| CN110474728A (en) * | 2018-05-11 | 2019-11-19 | 电信科学技术研究院有限公司 | A kind of synchronization message sends the selection method and terminal of carrier wave |
| CN110474728B (en) * | 2018-05-11 | 2022-02-08 | 大唐移动通信设备有限公司 | Selection method and terminal for synchronous message sending carrier |
| CN112543507A (en) * | 2019-09-23 | 2021-03-23 | 成都鼎桥通信技术有限公司 | Carrier selection method, device, base station and storage medium based on uplink interference |
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