CN1503580A - Mobile terminal scheduling method in layered community system - Google Patents
Mobile terminal scheduling method in layered community system Download PDFInfo
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- CN1503580A CN1503580A CNA021531978A CN02153197A CN1503580A CN 1503580 A CN1503580 A CN 1503580A CN A021531978 A CNA021531978 A CN A021531978A CN 02153197 A CN02153197 A CN 02153197A CN 1503580 A CN1503580 A CN 1503580A
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Abstract
This invention puts forward a mobile terminal dispatch method in a hierarchical local area system, in which, the hierarchical local area system is a local area not less than two layers. First of all, the velocity of a terminal is measured, if it is a high speed mobile state, it judges if there is an even higher local area covering the present one, if so, the terminal is switched to the even higher destination one, if the terminal is at low speed mobile state, it judges if an even lower one covered by the presents, if so, the terminal is switched to the lower, if the terminal is at middle speed, the terminal is remained in the present one.
Description
Technical field
The present invention relates to mobile communication system, refer more particularly to the portable terminal changing method of communication system with layered cell structure.
Technical background
In mobile communication system, for example GSM and cdma system, one of maximum characteristics are that portable terminal can keep communication continuity in moving process, this realizes by switching in the minizone.
As shown in Figure 1, point moves to the process that C orders portable terminal U1 along dotted line from A, and the sub-district of communicating by letter with it also changes along with the residing position of portable terminal.In the A of position, because sub-district Ba can provide the excellent communications quality, portable terminal only communicates with sub-district Ba.When moving near the soft handover area, for example during the B point because sub-district Bb also can provide the communication quality that meets the demands, in cdma system, under the situation that soft handover is supported, portable terminal can be simultaneously and sub-district Bb connect and communicate, be i.e. soft handover; In gsm system, if the communication quality that sub-district Bb provides is better than sub-district Ba, then portable terminal U1 can disconnect and the communicating by letter of sub-district Ba, and communicates by letter and forward to sub-district Bb, i.e. direct-cut operation.Leave soft handover area when portable terminal at last, when C point move, owing to sub-district Ba at this moment can not provide the communication quality that meets the demands, portable terminal will disconnect and the communicating by letter of sub-district Ba, and sub-district Bb communicate.
Realize such handoff procedure, need carry out the mutual of many signalings, mainly comprise at portable terminal and network: measure control, measurement report, switching command is confirmed etc.Under normal conditions, the frequency that switch to take place is not high, thus the signaling that causes of handoff procedure to influence concerning whole system be not very big.
But in hierarchical cellular system, as shown in Figure 2, because the radius of society change is littler, very big variation has just taken place in situation, need often switch.
As shown in Figure 3, a mobile terminal UE is passed through circular cell from cell edge with angle at random, and radius of society is R, passes through angle alpha from 0 to 90 degree change at random.
Just can obtain by simple computation, the average distance of process was when mobile terminal UE was passed through the sub-district: 4R/p.
If the speed of portable terminal is V, then average crossing time is: 4R/pV.
If the time of once conversing is Tcall, then the average switching times that carries out in communication process is:
That is to say that the speed that switching times that portable terminal takes place and terminal move is directly proportional and radius of society is inversely proportional in communication process.Contrast a radius and be the macrocell that 200 meters Microcell and radius are 1200 meters, same portable terminal, the switching times that takes place in the same air time is the ratio of their radius, promptly 1: 6.
Suppose that radius of society is 200 meters, what this portable terminal carried out is voice call, and once Tong Hua duration is 90 seconds, and then under different rate travels, the switching times that carries out in communication process is as shown in the table.
Average switching times in table 1 air time
| Translational speed (kilometer/hour) | ????10 | ????40 | ????70 | ????120 |
| Average switching times/conversation | ????1 | ????4 | ????7 | ????12 |
Be not difficult to find out, if terminal moves with 70 kilometers/hour speed, if this terminal keeps communicating by letter with microcell base station, then in 90 seconds air time, need to carry out nearly 7 times switching, if and it keeps communicating by letter with macro cell base station when high-speed mobile, then in whole communication process, switch as long as carry out once at most.
Obviously, if the terminal of a lot of fast moving all keeps when communicating and being connected of Microcell in the floored community, then for whole system, frequent hand off signaling will cause the rapid rising of signaling load, even may cause the congested of signaling, have a strong impact on intrasystem other function and overall performance.Simultaneously, too much switching concerning communication in terminal, also can produce certain influence, for example decline of communication quality, raising of cutting off rate or the like.
So common handoff algorithms can not satisfy the performance requirement of this system, its defective is not have to consider well the speed issue of portable terminal in floored community.
Summary of the invention
Purpose of the present invention proposes portable terminal dispatching method in a kind of hierarchical cellular system exactly, hand off signaling in the minimizing system to a great extent, between the different layers of floored community, carry out the rational management of portable terminal, thereby improve the communication quality of system and the stability of system.
Portable terminal dispatching method in a kind of hierarchical cellular system, described hierarchical cellular system are divided into and are no less than two-layer above sub-district, and described dispatching method may further comprise the steps:
A, the speed of the portable terminal that communicates with each layer sub-district is measured;
If the speed of the described portable terminal of b is higher than predetermined first speed, judge that then this portable terminal is in high-speed moving state, enters step c; If the speed of described portable terminal is lower than predetermined second speed, judge that then this portable terminal is in the low speed mobile status, enters step e; If the speed of described portable terminal between predetermined first speed and second speed, judges then that this portable terminal is in the middling speed mobile status, enters step g;
C, judge whether that more high-rise sub-district is covered with the sub-district that current and described portable terminal communicates, if having, then enters steps d; Otherwise enter step g;
D, definite more high-rise Target cell switch to described more high-rise Target cell with described portable terminal from current area;
E, judge whether that more the sub-district of low layer is covered by the sub-district that current and described portable terminal communicates,, then enter step f if having; Otherwise enter step g;
F, definite more low layer Target cell switch to described more low layer Target cell with described portable terminal from current area;
G, described portable terminal is retained in the current area.
Described steps d is further comprising the steps of:
If the d1 handoff failure then passes through repeating step d after the predetermined time delay;
After if the d2 number of repetition reaches predetermined number of times, then interrupt this communications of Mobile Terminals, perhaps enter step g.
Described step f is further comprising the steps of:
If the f1 handoff failure then passes through repeating step f after the predetermined time delay;
After if the f2 number of repetition reaches predetermined number of times, then enter step g.
Described step b further comprises: if in the predetermined time cycle, the number of times that described portable terminal switches surpasses predetermined first numerical value, judges that then this portable terminal is in high-speed moving state; If in the predetermined time cycle, the number of times that described portable terminal switches is lower than predetermined second value, judges that then this portable terminal is in the low speed mobile status; If in the predetermined time cycle, the number of times that described portable terminal switches judges that then this portable terminal is in the middling speed mobile status between first numerical value and second value.
Described time cycle, first numerical value, second value can pre-determine according to performance requirement.
Described time delay, predetermined number of times pre-determine according to the speed of described portable terminal.
Adopt the present invention, switching times in can the minimizing system, carry out on the basis of signal measurement at common handoff algorithms, translational speed in conjunction with terminal, between the different layers of floored community, carry out the rational management of terminal, thereby improve the communication quality of system and the stability of system, also reduce system cost simultaneously.
Description of drawings
Fig. 1 is that portable terminal switches schematic diagram in communication process;
Fig. 2 is the structural representation of floored community;
Fig. 3 is that portable terminal passes through the sub-district schematic diagram;
Fig. 4 is portable terminal scheduling flow figure of the present invention;
Fig. 5 is that the portable terminal in the Microcell moves schematic diagram.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described.
In mobile communication system, in order to provide enough capacity at hot zones or heavy traffic area, usually in macrocell, set up Microcell and reach the requirement of satisfying big capacity and big covering with less cost, Here it is so-called layered cell structure (HCS), in this system, macrocell mainly satisfies covering, and Microcell mainly provides capacity.
As shown in Figure 4, at first the speed to the portable terminal that communicates with each layer sub-district is measured in hierarchical cellular system, and the judgement status of mobile terminal, the method for judgement has a variety of, and a kind of simple method is exactly historical in intrasystem switching according to portable terminal.For a portable terminal that in the sub-district, communicates, 1) if in period of time T 1, N1 above switching taken place in this terminal, then this terminal is judged as high speed mobile terminal; 2) if in period of time T 2, the switching times that this terminal takes place is less than N2 time, and then this terminal is judged as the low speed portable terminal; 3) otherwise, this terminal is judged as the middling speed portable terminal.Wherein parameter (T1, N1) and (T2 is predefined according to different performance requirements N2), at the sub-district of different layers different parameter values is set; Simultaneously, for the different districts that is in one deck, also can be arranged to different values.
This speed estimation method can effectively overcome the not high erroneous judgement problem of bringing of conventional method medium velocity estimated accuracy, because the main purpose of carrying out terminal scheduling is to reduce the frequent Signalling exchange that brings that switches.
Example one: as shown in Figure 5, the terminal of different rates random distribution in the sub-district, though high-speed terminal A has very high speed, it mainly moves in same sub-district, so it can not switch to neighbor cell, also just system is not caused the signaling burden.But terminal B is just different, and it will cause frequent switching requirement and signaling load to other Microcell high-speed mobile.By based on switching historical speed estimation method, have only terminal B to be judged as high-speed terminal, and terminal A is mistaken for low speed terminal, but such erroneous judgement just is retained in terminal A in the Microcell, reached the purpose that improves power system capacity.
Example two: as shown in Figure 5, low speed terminal C paces up and down in the soft handover area of Microcell, and according to common handoff algorithms, this terminal can table tennis take place between two Microcells inevitably to be switched, and causes many unnecessary switchings and signaling.When adopting based on after switching historical speed decision method, this terminal can be judged as high-speed terminal, is switched to macrocell, and the unescapable table tennis switching problem of general handoff algorithms has exactly effectively been eliminated in such erroneous judgement.
According to the residing state of terminal, operate accordingly then.If this portable terminal is in high-speed moving state, judge whether that more high-rise sub-district is covered with the sub-district that current and described portable terminal communicates, if have, determine more high-rise Target cell, described portable terminal is switched to described more high-rise Target cell from current area, if handoff failure, then through repeating this step behind the predetermined time delay T3, for high-speed terminal, when the repetition through N3 number can't switch to high-rise sub-district to it, from reducing the angle of signaling load, can be directly the communication disruption of this terminal and current area, and from the reduction system angle of terminal cutting off rate, then can continue to keep communicating by letter of this terminal and current area.
If this portable terminal is in the low speed mobile status, judge whether that then more the sub-district of low layer is covered by the sub-district that current and described portable terminal communicates, if have, determine more low layer Target cell, described portable terminal is switched to described more low layer Target cell from current area; If handoff failure then through repeating this step behind the predetermined time delay T4, for low speed terminal, when the repetition through N4 number can't switch to the sub-district of low layer to it, can continue to keep communicating by letter of this terminal and current area.
If this portable terminal is in the middling speed mobile status, then continue to keep communicating by letter of this terminal and current area.
Parameter T3 and T4 are for fear of when switching procedure failure, the unnecessary switching command of frequent initiation, parameter N 3 and N4 are in order to improve the terminal scheduling performance that estimation is carried out based on terminal speed, and for the terminal of different translational speeds, the parameter of setting is also different.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (6)
1, portable terminal dispatching method in a kind of hierarchical cellular system, described hierarchical cellular system are divided into and are no less than two-layer above sub-district, and described dispatching method is characterised in that and may further comprise the steps:
A, the speed of the portable terminal that communicates with each layer sub-district is measured;
If the speed of the described portable terminal of b is higher than predetermined first speed, judge that then this portable terminal is in high-speed moving state, enters step c; If the speed of described portable terminal is lower than predetermined second speed, judge that then this portable terminal is in the low speed mobile status, enters step e; If the speed of described portable terminal between predetermined first speed and second speed, judges then that this portable terminal is in the middling speed mobile status, enters step g;
C, judge whether that more high-rise sub-district is covered with the sub-district that current and described portable terminal communicates, if having, then enters steps d; Otherwise enter step g;
D, definite more high-rise Target cell switch to described more high-rise Target cell with described portable terminal from current area;
E, judge whether that more the sub-district of low layer is covered by the sub-district that current and described portable terminal communicates,, then enter step f if having; Otherwise enter step g;
F, definite more low layer Target cell switch to described more low layer Target cell with described portable terminal from current area;
G, described portable terminal is retained in the current area.
2, portable terminal dispatching method in a kind of hierarchical cellular system as claimed in claim 1, it is characterized in that: described steps d is further comprising the steps of:
If the d1 handoff failure then passes through repeating step d after the predetermined time delay;
After if the d2 number of repetition reaches predetermined number of times, then interrupt this communications of Mobile Terminals, perhaps enter step g.
3, portable terminal dispatching method in a kind of hierarchical cellular system as claimed in claim 1, it is characterized in that: described step f is further comprising the steps of:
If the f1 handoff failure then passes through repeating step f after the predetermined time delay;
If the f2 number of repetition enters step g after reaching predetermined number of times.
4, portable terminal dispatching method in a kind of hierarchical cellular system as claimed in claim 1, it is characterized in that described step b further comprises: if in the predetermined time cycle, the number of times that described portable terminal switches surpasses predetermined first numerical value, judges that then this portable terminal is in high-speed moving state; If in the predetermined time cycle, the number of times that described portable terminal switches is lower than predetermined second value, judges that then this portable terminal is in the low speed mobile status; If in the predetermined time cycle, the number of times that described portable terminal switches judges that then this portable terminal is in the middling speed mobile status between first numerical value and second value.
5, portable terminal dispatching method in a kind of hierarchical cellular system as claimed in claim 4, it is characterized in that: described time cycle, first numerical value, second value can pre-determine according to performance requirement.
6, as portable terminal dispatching method in claim 2 or the 3 described a kind of hierarchical cellular systems, it is characterized in that: described time delay, predetermined number of times pre-determine according to the speed of described portable terminal.
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| CN 02153197 CN1223218C (en) | 2002-11-26 | 2002-11-26 | Mobile terminal scheduling method in layered community system |
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| CN 02153197 CN1223218C (en) | 2002-11-26 | 2002-11-26 | Mobile terminal scheduling method in layered community system |
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| WO2008089640A1 (en) * | 2007-01-17 | 2008-07-31 | Huawei Technologies Co., Ltd. | Method for handovering a terminal to a macrocell, system, terminal, ap and gateway thereof |
| CN100442909C (en) * | 2005-01-05 | 2008-12-10 | 华为技术有限公司 | Interlaminar switching method in WCDMA hierarchical network |
| CN100479596C (en) * | 2005-04-29 | 2009-04-15 | 中国科学院上海微系统与信息技术研究所 | Sorted switching method for wireless mobile communication system |
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| CN100442909C (en) * | 2005-01-05 | 2008-12-10 | 华为技术有限公司 | Interlaminar switching method in WCDMA hierarchical network |
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| CN101052221B (en) * | 2007-05-22 | 2010-05-19 | 王海舟 | Communication small area switching method and device |
| CN101583169B (en) * | 2008-05-12 | 2011-07-27 | 中国移动通信集团上海有限公司 | Method and equipment for selecting cell access for terminal equipment |
| WO2010017760A1 (en) * | 2008-08-11 | 2010-02-18 | 中兴通讯股份有限公司 | Method for setting motion state of terminal |
| CN101651878B (en) * | 2008-08-11 | 2013-02-27 | 中兴通讯股份有限公司 | Method for setting motion state of terminal |
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| CN101909322A (en) * | 2009-06-03 | 2010-12-08 | 中兴通讯股份有限公司 | Mobile terminal and method for reporting mobile state thereof |
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| WO2019127414A1 (en) * | 2017-12-29 | 2019-07-04 | 北京小米移动软件有限公司 | Method and device for determining residence cell, user equipment, and base station |
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