CN101137187B - Wireless communication network system and its access method - Google Patents
Wireless communication network system and its access method Download PDFInfo
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- CN101137187B CN101137187B CN2007101306298A CN200710130629A CN101137187B CN 101137187 B CN101137187 B CN 101137187B CN 2007101306298 A CN2007101306298 A CN 2007101306298A CN 200710130629 A CN200710130629 A CN 200710130629A CN 101137187 B CN101137187 B CN 101137187B
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Abstract
The invention relates to a radio communication network system, comprises: a wide coverage cell used the first carrier frequency; one or more common cells whose carrier frequency is different from the first carrier frequency in the wide coverage cell. The access method of the network system comprises judging the terminal accessed to the wide coverage cell whether in a common cell thereof or not, if yes, the terminal is controlled to access the common cell. The invention solves the problem that existing network mountain stations have interferences to earth stations in coverage area thereof, thereby the mountain stations can not be removed, and solves the problem of telephone variable-density coverage in wide area.
Description
Technical field
The present invention relates to radio honeycomb communication system, relate in particular to a kind of wireless communication network system and cut-in method thereof.
Background technology
In the planning and construction of cordless communication network, usually can run into following situation:
Need the region of covering wide, but user's traffic density changes great disparity in the coverage, concentrate on some interior user's highly dense in zone among a small circle often, and other regional in a big way users are sparse.Example as shown in Figure 1, cities and towns and small towns belong to the intensive zone of the less user of area, though and rural area and the numerous users in region, pasture are sparse, however, also require the network coverage to arrive these zones.
According to the network plan method of routine, generally require the sub-district to distribute by the plane cellular topology, all there is oneself clearer and more definite bounds each sub-district, avoids overlapping covering between the sub-district as far as possible, to reach the normal level of network capacity and performance.In order to avoid the interference between area covered and the base station as far as possible, the antenna of base station is hung height can not differ too big, and for example the urban area circumstance suggestion is about 30 meters, about 40 meters of suburban environment, about 50 meters of rural environments, and, do not advise in principle on high mountain, building wide coverage base station or being called high-altitude station.
Like this, though the high mountain on open next door, target coverage zone as shown in Figure 1 can be used as the condition of building a station of wide coverage base station, network plan method should not be in and builds the base station on the high mountain routinely.Therefore, if network plan method routinely then needs to set up more conventional base station or be called ground station,, like this, must cause construction cost higher and benefit is lower to satisfy the covering demand of All Ranges.
In order to control construction cost, at the initial stage of network development, under the little situation of customer volume, broken the general networks planing method, some areas have used high-altitude station extensively to cover, to realize the covering to the little big zone of customer volume.
But along with the development of business, the user is on the increase, and must dilatation increase ground station carry out the routine covering, to satisfy the highly dense demand of regional among a small circle user.The schematic diagram of high-altitude station shown in Figure 2 and ground station's coexistence, so, the conventional sub-district of newly-built ground station will be in the zone of wide coverage cell of high-altitude station inevitably, formed the interference of high-altitude station so on the one hand to the signal of ground station, influence the network performance of ground station, make on the other hand to cause the covering and the capacity anomic division of labor of high-altitude station and ground station being in overlapping covered terminal and may insert high-altitude station, cause the high-altitude station capacity overload easily.
This situation is the difficult problem that puzzlement 800MHz and 450MHz cdma network are built always: if the removal high-altitude station substitutes with a plurality of ground stations, then need to build more ground station, construction cost is huge, and network quality instability in the process of pulling down and removing a building for reconstruction, and technical difficulty is big, workload is big; If do not remove high-altitude station, then can form and disturb the ground station in its overlay area.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of wireless communication network system and method for network access, solving the interference problem of wide coverage base station to the conventional base station of institute overlay area, and avoid that wide coverage base station removes expensive.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of wireless communication network system comprises: the wide coverage cell of using first carrier frequency; Be positioned at wide coverage cell coverage, the carrier frequency that uses and the different one or more conventional sub-district of described wide coverage cell carrier frequency.
Wherein, described one or more conventional sub-district is that carrier frequency uses identical or mutually different conventional sub-district.
A kind of cut-in method based on described wireless communication network system, this method comprises: judge whether the terminal that inserts wide coverage cell is in the interior conventional sub-district of wide coverage cell coverage, if then control this terminal and attempt inserting described conventional sub-district.
Before described judgement, this method further comprises: the terminal of confirming the wide coverage cell of access is second Terminal Type, and described second Terminal Type is for can not at first attempting inserting the terminal of conventional cell carrier frequencies after starting shooting.
Wherein, to insert the terminal of wide coverage cell be that the step of second Terminal Type comprises in described affirmation: by obtaining the terminal type information of this terminal alternately with terminal information; Or, by with this terminal before the information interaction of base station of sub-district, place obtain the terminal type information of this terminal.
Perhaps, to insert the terminal of wide coverage cell be that the step of second Terminal Type comprises in described affirmation: the terminal type information that read this terminal before the base station of wide coverage cell the terminal information of record.
In the such scheme, the step whether terminal that described judgement inserts wide coverage cell is in the conventional sub-district in the wide coverage cell coverage comprises: the affirmation location information of terminals; Location information of terminals and described conventional cell coverage area are judged relatively whether this terminal is in the conventional sub-district.
Before this terminal of control attempted inserting described conventional sub-district, this method further comprised: confirm the current condition that inserts described conventional sub-district of switching that meets of described terminal.Wherein, the described condition of switching the described conventional sub-district of access that meets comprises: satisfy current time and the last time interval thresholding that requires this terminal switching to insert described conventional sub-district.The described condition that switch to insert described conventional sub-district that meets comprises: when terminal is in idle condition, insert wide coverage cell during the stage or the release of customer service during the stage.
By such scheme as can be seen, wireless communication network system provided by the invention, the ground station of high-altitude station and its overlay area can adopt different carrier frequency, thereby can effectively avoid high-altitude station that the signal of its overlay area ground station is disturbed.
Cut-in method provided by the invention then can make the terminal that is in high-altitude station and the ground station repetition overlay area at first attempt inserting ground station, to make full use of the carrier frequency resource of ground station, avoids taking the resource of too much high-altitude station.When ground station can't insert, as overlay area, built on stilts station, and still in the high-altitude station overlay area, then can insert high-altitude station, thereby guarantee the availability of the terminal traffic under the big zone of its covering.
And, high-altitude station can be controlled the terminal that is in the overlapping region under traffic affecting situation not, as in terminal in access procedure, when being in idle condition or use professional release during the stage, control terminal switches and inserts ground station, to guarantee the quality of service of network.
Description of drawings
Fig. 1 is near the geographical schematic diagram of the user's traffic density inequality high mountain;
Fig. 2 is the schematic diagram of high-altitude station and ground station's coexistence;
Fig. 3 is the floor map of wide coverage cell and the coexistence of conventional sub-district;
Fig. 4 is the network insertion flow chart.
Embodiment
For fear of the interference of high-altitude station to ground station, the present invention has distributed different carrier frequency to high-altitude station with ground station.Floor map referring to the conventional sub-district coexistence of the wide coverage cell of the high-altitude station shown in Fig. 3 and ground station is elaborated below.
Wireless communication network system provided by the invention comprises: the wide coverage cell of using first carrier frequency; Be located in the wide coverage cell, the institute carrier frequency that the uses one or more conventional sub-district different with described first carrier frequency, can use identical between wherein said each different conventional sub-district or mutual different carrier frequency.
Be elaborated for example below:
In the target coverage area, if any the wide convenience that covers such as high mountain or high tower, and when two or more available carrier frequencies resource is arranged, can adopt different carrier frequency with the conventional sub-district in this sub-district, form two-tier system according to the wide coverage cell that the present invention is provided with cordless communication network.Wherein, by wide coverage cell, the covering that realizes on a large scale, hangs down traffic; By conventional sub-district, realize intensively or extensively cover the zone that signal stopped and absorb main traffic to traffic, realize that the degree of depth covers.Like this, the two-tier system of wide coverage cell and conventional sub-district is divided the work clearly, is cooperatively interacted, and does not disturb mutually.
Wherein, on capacity, should satisfy following relation between wide coverage cell and the conventional sub-district: the total traffic that conventional sub-district is born is less than the total traffic that wide coverage cell can be born.When total traffic rises, can adjust or the dilatation general networks, increase the telephone traffic that conventional sub-district is born; Wherein, each conventional sub-district is not overlapping, can adopt identical or different carrier frequency, but all is different from the carrier frequency of wide coverage cell.Certainly, also can adjust or the wide overlay network of dilatation, increase the telephone traffic that wide coverage cell can be born.
Like this, there are high-altitude station and ground station simultaneously, promptly solved the wide covering problem that requires the zone, can satisfy the intensive situation of traffic among a small circle again, and because different carrier frequency resources has been adopted in the sub-district of high-altitude station and ground station, the high-altitude station signal can not form ground station's signal and disturb.
Specifically when configuration, after guaranteeing that terminal inserts conventional sub-district, when outwards moving to the sub-district of having only the high-altitude station covering, can realize that normal alien frequencies switches, keeping proper communication, need be its alien frequencies adjacent area with the wide coverage cell of the conventional cell configuration correspondence in edge.
Though as above solved the interference problem of the wide coverage cell of high-altitude station,, still needed to carry out certain improvement for the cut-in method of this network to the conventional sub-district of ground station in its zone.Below method for network access is described in detail:
Terminal can be divided into two classes according to the mode of access network, and for first kind terminal, terminal can be set to the carrier frequency of preferred ground station, after this function is enabled, and behind this type of starting up of terminal, meeting first search ground station carrier frequency, trial inserts the conventional sub-district on ground; If access failure just can be searched for the wide coverage cell that the high-altitude station carrier frequency inserts high-altitude station.
For second Terminal Type, also can be described as non-first kind terminal, this Terminal Type has often solidified the function of memory access frequency point last time, can not at first search for ground station's carrier frequency behind the starting up of terminal, therefore when being in the overlapping covering of high-altitude station and ground station regional, still may insert high-altitude station, so not only ground station is not fully utilized, and also is easy to cause the high-altitude station overload.Second Terminal Type exists bigger ratio in existing network.
Be positioned at network insertion problem when overlapping covered in order to solve second Terminal Type, the present invention proposes corresponding cut-in method, after the terminal that inserts wide coverage cell is positioned at overlapping coverage cell, wide coverage base station sends to terminal on suitable opportunity and strides the instruction of assignment frequently, makes terminal attempt inserting conventional sub-district.Referring to the network insertion flow chart shown in Fig. 4, this network insertion may further comprise the steps:
Step 401: wide coverage base station judges whether the terminal that inserts its wide coverage cell is second Terminal Type, if then carry out next step, otherwise finishes this flow process.
Here explanation is, when wide coverage base station does not store this terminal information, when inserting the sub-district of this base station covering first as this terminal, can require terminal to register by information interaction, obtain identification information, the terminal type information such as (first kind or second classes) of this terminal, perhaps with this terminal before the base station of sub-district, place carry out information interaction and obtain this terminal information, to be used for judgement to terminal type.After this end message was had overwriting, directly this end message of transferring storage according to terminal iidentification can be determined the type of this terminal.
Step 402: wide coverage base station judges whether described second Terminal Type is in the zone of wide coverage cell and the overlapping covering in conventional sub-district, if then carry out next step, otherwise finish this flow process.
Wherein, wide coverage base station can be according to the metrical information to terminal, estimation obtains the positional information of terminal and this base station, again according to the positional information and the coverage of the conventional base station in the coverage of being stored, determine that terminal is current whether in overlapping covered, and in which overlapping area of coverage.
Step 403: wide coverage base station judges that the current switching of whether satisfying setting of this second Terminal Type inserts the condition of conventional sub-district, if then carry out next step, otherwise finishes this flow process.
Wherein, the switching condition of setting can comprise one of following or condition combination arbitrarily:
A) satisfy current time and the last interval thresholding that requires this terminal to switch the time of inserting conventional sub-district.Wherein, this time interval thresholding can be set and revise.It is for fear of frequent the switching taken place that this time interval thresholding is set.
B) to opportunity of the quality influence minimum of customer service.As can for end when the idle condition or use professional release during the stage, or when the stage of access network etc.Wherein, use business refers to talk business, GPRS business of networking etc.
Step 404: wide coverage base station is controlled the conventional sub-district that this second Terminal Type switches the conventional base station of inserting this overlapping region.
Wherein, can stride assignment frequently and instruct and notify terminal to switch to described conventional sub-district by sending to this terminal.
Below in conjunction with the example of CDMA2000 commercial network, the present invention is described in more detail:
One city is arranged, on the next door, city the mountain range is arranged, the mountain height is about 500 meters.On the mountain, had high-altitude station, with solving the covering in mountain region, the suburbs and outer suburbs; Main place, city covers by the conventional sub-district of ground station; The suburb area is very big, and ground station is considerably less, and the telephone traffic in suburb is also less.
Use before the present invention, high-altitude station uses identical carrier frequency with ground station, and the antenna principal direction that two high mountain sectors are arranged is crossed main city and covered the zone, outer suburbs towards main city.The high-altitude station signal causes serious interference to the ground station's signal in the city thus, and the Urban Network performance index are poor; Overload often appears in high-altitude station simultaneously, and the load of many ground stations is light partially.
According to the present invention, this network has been carried out the layering adjustment.Make high-altitude station use different carrier frequency, specifically, keep ground station's carrier frequency constant, high-altitude station is adjusted into another carrier frequency with ground station.Like this, solved the covering in main city and fraction suburb by ground station, all the other vast suburbs are covered by high-altitude station.Be in when overlapping covered as terminal, the preferential conventional sub-district of ground station of inserting, if because of cause influences such as terminal type, moving events, the terminal in the overlapping area of coverage has inserted high-altitude station, then by high-altitude station in due course machine send and to stride instruction frequently and terminal is switched be linked into ground station.
Network insertion process to this embodiment is described in detail below, may further comprise the steps:
First step: when wide coverage base station confirms that the terminal of its network of access is second Terminal Type, carry out second step.
As mentioned above, because first kind terminal can preferably insert ground station, if first kind terminal inserts high-altitude station, it is unsuccessful to have shown that then it once searched for ground station's carrier frequency, therefore avoids the wide coverage base station of high-altitude station that first kind terminal is sent here and strides the instruction of assignment frequently.
A kind of mode of operation is, works as user-network access, and when the user provided terminal or registered terminal, at first whether sense terminals can be provided with preferential carrier frequency, as can, terminal is set to preferentially select ground station's carrier frequency, and is recorded as first kind terminal; To the terminal of having netted, can cooperate by manufacturer terminal, develop the software of automatic setting, operator is provided with software to user's mailing then, or is issued to user terminal by communication network, and the user realizes that automatically carrier frequency priority is provided with and registers to base station system after moving above-mentioned software, if the software that manufacturer terminal does not also have exploitation to be provided with automatically, can make house calls by operator, or require the user to obtain service, operate the same to business office of operator; The identification record of all first kind terminals is all imported the base station system storage, and high-altitude station just can utilize this stored information identification terminal type in the process that terminal inserts.
Second step: wide coverage base station basis and the mutual information of described second Terminal Type, estimation obtains the position of terminal with respect to this base station.Judge then whether this position is in the zone of setting, this zone is overlapping covered, because wireless location technology has been a mature technique, as terminal being positioned or position according to GPS according to the measuring-signal of a plurality of base stations to terminal, repeats no more herein.When the position of judging terminal is in the zone of setting, then carry out third step.
Certainly, if the position of several conventional sub-districts is more concentrated, the zone that these several sub-districts can be formed is as a scope.Referring to shown in Figure 3,3 conventional sub-districts of relatively concentrating are arranged below the wide coverage cell 1, the distance of these 3 conventional sub-districts and high-altitude station all at Rn between the Rf, therefore for wide coverage cell 1, can specified scope (Rn, Rf) be overlapping covered, when judging terminal and be positioned at this specified scope, then carry out third step.Be understood that the specified scope of each wide coverage cell can have nothing in common with each other, can be different from the specified scope of wide coverage cell 1 as the specified scope of wide coverage cell 2.
Third step: wide coverage base station is judged the current condition that whether satisfies the conventional sub-district of switching the access overlapping region of described second Terminal Type, if satisfy, then carries out the 4th step.Wherein switching condition comprises:
A) satisfy current time and the last interval thresholding that requires the time of this terminal switching.The use of this thresholding helps avoiding too frequent striding frequently to be switched.As shown in Figure 3, wide coverage cell 1 time, the zone except that conventional sub-district is covered by high-altitude station, when terminal is positioned at this edge, overlapping region, if receiving the assignment frequently of striding of high-altitude station instructs, with removal search ground station carrier frequency, if since ground station's signal too a little less than, must cause striding and frequently attempt failure, from and return and insert the high-altitude station carrier frequency, too frequent striding failed frequently and returned, and will influence network performance and user's impression, so adopts time interval thresholding to avoid frequent switching here.Base station system will write down each terminal and receive the time of striding the instruction of assignment frequently for the last time, so that follow-up judgement.Best time interval thresholding answers analysis user mobility behavioural characteristic to draw, and can be optimized according to striding frequency handover success/failure statistics.The initial threshold value can set up on their own, for example selects 12 hours, or 24 hours, or 36 hours etc.
B) to opportunity of the quality influence minimum of business.Can be that terminal is when rigidly connecting into high-altitude station this opportunity, also can be that customer service is during the free time, can be that the user uses when connecting release for the first time in the business procedure, the almost imperceptible existence of striding the frequency search of user like this helps promoting the evaluation of user to network quality.Can be provided with this opportunity, can be optimized according to user behavior and systematic function statistics.
The 4th step: wide coverage base station sends the function of striding the instruction of assignment frequently to described terminal, switches the sub-district of the conventional base station of inserting the overlapping region by striding the command request of assignment frequently terminal.
For example in cdma2000 1xEVDO system, this strides the instruction of assignment frequently can be the alien frequencies redirect message, and this message will comprise the information of ground station's carrier frequency.
For the example of above-mentioned CDMA2000 commercial network, employing the present invention through drive test, proves the interference eliminated of high-altitude station to the city after carrying out layering adjustment enforcement, and the every covering performance index in city is obviously improved; Through network management center's statistics, the load of high-altitude station obviously descends on the other hand, and the situation of overload takes place seldom again; The traffic load of the most ground stations in city rises, and reaches normal range (NR).Proof thus, the division of labor of the overlay area of high-altitude station and ground station is clear and definite, and the volume load of high-altitude station is within its bearing capacity, and high-altitude station temporarily need not dilatation.
Therefore, the present invention is according to geographical conditions and frequency resource, high-altitude station is distributed different carrier frequency with ground station, solved the interference problem of high-altitude station to the ground station of its overlay area content, guaranteed also that wide covering to the zone requires and to the demand of routine district telephone traffic, that has avoided that removal high-altitude station and a plurality of ground stations of enlarging cause is expensive.
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 (5)
1. the cut-in method of a wireless communication network system, it is characterized in that, wireless communication network system comprises the wide coverage cell of using first carrier frequency, and be positioned at wide coverage cell coverage, the carrier frequency that uses and the different one or more conventional sub-district of described wide coverage cell carrier frequency, this method comprises:
Whether A, the terminal that judge to insert wide coverage cell are second Terminal Type, if execution in step B then, otherwise finish current flow process; Wherein, described second Terminal Type is for can not at first attempting inserting the terminal of conventional cell carrier frequencies after starting shooting;
B, judge whether described second Terminal Type is in the zone of wide coverage cell and the overlapping covering in conventional sub-district, if, execution in step C then, otherwise finish current flow process;
C, judge that described second Terminal Type is current and whether satisfy the condition that the switching of setting inserts conventional sub-district, if execution in step D then, otherwise finish current flow process; Wherein, described condition comprises one of following or condition combination arbitrarily: a) satisfy current time and the last interval thresholding that requires this terminal to switch the time of inserting conventional sub-district; B) to the opportunity of the quality influence minimum of customer service, comprise when terminal is in idle condition or use professional release during the stage, or when the stage of access network;
D, described second Terminal Type of control attempt switching the conventional sub-district of the conventional base station of inserting this overlapping region.
2. method according to claim 1 is characterized in that, the terminal that described judgement inserts wide coverage cell is that the step of second Terminal Type comprises:
By obtaining the terminal type information of this terminal alternately with terminal information; Or,
By with this terminal before the information interaction of base station of sub-district, place obtain the terminal type information of this terminal.
3. method according to claim 1 is characterized in that, the terminal that described judgement inserts wide coverage cell is that the step of second Terminal Type comprises:
Before the base station of wide coverage cell, read the terminal type information of this terminal the terminal information of record.
4. method according to claim 1 is characterized in that, the step whether terminal that described judgement inserts wide coverage cell is in the conventional sub-district in the wide coverage cell coverage comprises:
Confirm location information of terminals;
Location information of terminals and described conventional cell coverage area are judged relatively whether this terminal is in the conventional sub-district.
5. method according to claim 1 is characterized in that, the condition that described satisfied switching inserts described conventional sub-district comprises:
When terminal is in idle condition, insert wide coverage cell during the stage or the release of customer service during the stage.
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| CN2007101306298A CN101137187B (en) | 2007-07-11 | 2007-07-11 | Wireless communication network system and its access method |
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| CN2007101306298A CN101137187B (en) | 2007-07-11 | 2007-07-11 | Wireless communication network system and its access method |
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| CN101137187B true CN101137187B (en) | 2010-12-08 |
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| CN102014502A (en) * | 2009-09-04 | 2011-04-13 | 华为技术有限公司 | Remote covering method and base station |
| CN103442384B (en) * | 2013-07-12 | 2016-08-10 | 北京神州泰岳软件股份有限公司 | Interference location and processing method, system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153444A (en) * | 1995-12-29 | 1997-07-02 | 陈卫斌 | Personal communication system |
| CN1322419A (en) * | 1999-08-09 | 2001-11-14 | Sk泰力康姆株式会社 | Method for carrying out handoff between macrocell and microcell in hierarchical cell structure |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153444A (en) * | 1995-12-29 | 1997-07-02 | 陈卫斌 | Personal communication system |
| CN1322419A (en) * | 1999-08-09 | 2001-11-14 | Sk泰力康姆株式会社 | Method for carrying out handoff between macrocell and microcell in hierarchical cell structure |
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