CN100479596C - Sorted switching method for wireless mobile communication system - Google Patents
Sorted switching method for wireless mobile communication system Download PDFInfo
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- CN100479596C CN100479596C CNB2005100256235A CN200510025623A CN100479596C CN 100479596 C CN100479596 C CN 100479596C CN B2005100256235 A CNB2005100256235 A CN B2005100256235A CN 200510025623 A CN200510025623 A CN 200510025623A CN 100479596 C CN100479596 C CN 100479596C
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Abstract
A switch method that uses for the wireless mobile communication system, uses the switch method based on the position estimation to the high-speed mobile terminal, uses the switch method based on the position estimation to the low-speed mobile terminal, according to the characteristic of the bed soft plot and the different mobile speed of the mobile terminal when it switches, uses the pre-contract switch method of the position information assistant to the blur type terminal because the speed estimation error can not confirm the speed type. The invention can solve that the existing technology use same switch mode to process the different type mobile terminal, can not provide different switch quality of service assuring issue, ensure the user to get the continuous switch effectively.
Description
Technical field
The present invention relates to the handoff technique of communication system, belong to areas of information technology.
Background technology
In the conventional cellular network, switch mainly is because the user may pass a plurality of sub-districts in moving process, and the use of the Radio Resource in each sub-district is separate, in order to provide a kind of successional service to the user, just need be when the user moves in the different districts or communication quality when can not satisfy customer requirements, in time the use of system resource is adjusted so-called switching that Here it is.The main foundation of switching is signal strength signal intensity and channel quality.When the current received power of user is lower than a certain threshold value, other sub-district of considering to adopt base station signal strength to be higher than threshold level is user's service.When the current use channel quality of user can not satisfy the communication needs, will consider to adopt other channels or the channel in other sub-districts in the current area to be user's service.At present existing research and utilization improves the changing method based on signal strength signal intensity the supplementary that the estimation of user moving speed and position provides, and judges but still depend on received signal intensity to a certain extent.
Low at the resource utilization that exists in the conventional cellular network, problems such as professional bad adaptability, someone proposes a kind of Radio Access Network architecture of novelty, be called the soft sub-district of layering (HSC:Hierarchical Soft Cell) wireless network architecture (document 1:PCT international patent application for example: " soft cell-radio network of a kind of layering and connection control method thereof ", application number: PCT/CN2004/000772), and at the changing method of a kind of position-based information of the soft subzone network structure of layering (for example document 2: the Chinese invention patent application: " a kind of changing method of the wireless communication system based on speed and position ", application number: 200410089455.1).As shown in Figure 1.Fully reduce transmitting power on the one hand, solve the electromagnetic interference problem of high-rate wireless transmission, realize the raising of tens of times of system transmissions performances and even hundreds of times on the other hand by immanent " space diversity ".In HSC, adopt distributing antenna system (1-1) to provide signal seamless, that power fluctuation is little to cover.With respect to the traditional base station antenna, the transmitting power of single antenna is lower in the distributing antenna system, and antenna footprint is less.For so novel system, the quality of handoff technique will exert an influence to systematic function to a great extent.Can be in the soft sub-district of layering according to the mobile terminal locations results estimated is determined whether that needs switch.In the normalization of travelling carriage equivalence penetraction depth during greater than given threshold value, start and switch, and by the position of travelling carriage, determine candidate target cells, choose normalization distance the shortest, available Target cell in all candidate cells of center of housing estate and portable terminal, implement to switch, guarantee that user's proper communication is unaffected.
The major defect of existing handoff technique is, adopts identical switching mode to handle dissimilar portable terminals.And dissimilar portable terminals, such as: the portable terminal of different translational speeds or the portable terminals that use difference to serve, when switching, its mobility and for the QoS that switches (service quality: Quality of Service) demand all is different.And in the future mobile communications business, the diversity of terminal class will be obvious day by day, will be to provide required QoS guarantee necessary for the user for dissimilar users provides dissimilar switching modes.
Employing is based on the main defective of the switching mode of signal strength signal intensity, overlapping region in a plurality of sub-districts (〉=2), because radio channel performance is received the influence of large scale shadow fading and small scale decline, big or small alternate appears in the signal strength signal intensity of cell base station sometimes, cause the user in the relatively short time, between a plurality of sub-districts, to be switched back and forth, promptly produce so-called " ping-pong " (consult document 3:P.P.Gregory. " Trends in Handover Design; " IEEE Commun.Mag., pp.82-90, March 1996.).
In the soft cell-radio network of layering, as shown in Figure 2, because antenna footprint is less, crossover region between antenna (2-1) is also less, if the changing method in the employing conventional cellular network based on signal strength signal intensity, can not avoid " ping-pong " on the one hand, finishing switching judging in less crossover region (2-1) on the other hand for the highspeed user has very big difficulty.So, in HSC, introduced sub-district crossover region antenna (2-2), constitute the crossover region shown in the dash area (2-3) by a plurality of sub-districts crossover region antenna, make the signal in crossover region cover with the same good by the signal covering that sub-district internal antenna (2-4) constitutes at center of housing estate, this provides the foundation for the changing method of position-based information.But the changing method of position-based information has certain requirement for the precision of location estimation, when position estimation accuracy is not high enough, for low speed user, the crossover region width of Dui Ying soft sub-district is less with it, at this moment will produce the ping-pong that position-based switches because of the error of location estimation, promptly because the error of location estimation and crossover region width during quite or greater than the crossover region width, and the switching that causes is judged by accident.Though in distributing antenna system, the signal quality of crossover region is better, is not easy to produce call drop, frequent mistake is switched still can bring bigger overhead to system's control, and can increase the possibility of switching call drop.
Summary of the invention
The object of the present invention is to provide a kind of changing method that is used for mobile radio system, overcome the above-mentioned shortcoming of prior art, for dissimilar users provides dissimilar switching modes.
Changing method of the present invention, adopt following steps:
At first, utilize spatial sampling (consult document 2: the Chinese invention patent application: " a kind of changing method of the wireless communication system based on speed and position ", application number: 200410089455.1), in time according to the v as a result of portable terminal velocity estimation
Est, portable terminal is carried out type divides, if the result of velocity estimation satisfies v
Est〉=v
Threshold_up, then terminal is divided into high-speed terminal; If the result of velocity estimation satisfies v
Est≤ v
Threshold_low, then terminal is divided into low speed terminal; If velocity estimation result does not satisfy above-mentioned two conditions, then terminal is divided into and is the vague category identifier portable terminal, condition is v
Threshold_low≤ v
Threshold_up
Secondly, for high speed mobile terminal, in its corresponding district, the changing method that adopts position-based to estimate.For the low speed portable terminal, in its corresponding district, adopt changing method based on signal strength signal intensity.Be positioned at velocity ambiguity district (promptly interval [v for the velocity estimation result
Threshold_low, v
Threshold_up]) terminal then need to adopt the auxiliary method for switching booking of positional information.
At last, according to the best changing method that is applicable to terminal, when terminal need be switched, in time finish the scheduling and the distribution of system resource, for terminal provides the continuous and reliable communication service.
Described type is divided, and refers to the performance according to speed estimation method that adopts in the spatial sampling process and location estimation method, determines speed type upper limit v
Threshold_upWith speed type lower limit v
Threshold_lowResult and two threshold values of portable terminal velocity estimation are compared, be higher than the high speed mobile terminal that is divided into of the upper limit, what be lower than lower limit is divided into the low speed portable terminal, is positioned at the determined velocity ambiguity of bound district [v
Threshold_low, v
Threshold_up] in, be divided into the vague category identifier portable terminal.
Described speed type upper limit v
Threshold_up, referring to performance according to speed estimation method that adopts in the spatial sampling process and location estimation method, definite speed is divided thresholding, and translational speed adopts the changing method of position-based estimation will obtain more excellent performance of handoffs greater than the portable terminal of this upper limit.
Described speed type lower limit v
Threshold_low, referring to performance according to speed estimation method that adopts in the spatial sampling process and location estimation method, definite speed is divided thresholding, and translational speed adopts the changing method based on signal strength signal intensity will obtain more excellent performance of handoffs less than the portable terminal of this lower limit.
Described more excellent performance of handoffs refers to and is guaranteeing under the prerequisite of certain handover success probability, compares with the speed threshold that adopts other, and it is less that portable terminal is finished the switching times that once conversation needs.
Described velocity ambiguity district, refer to error performance according to the speed estimation method that when spatial sampling, adopts, the speed zoning of determining, the velocity estimation value is arranged in the portable terminal in this zone can not only determine the changing method that it is corresponding according to its speed characteristics, and needs the auxiliary method for switching booking of employing positional information.
Described vague category identifier portable terminal refers to the portable terminal that the velocity estimation value is arranged in the velocity ambiguity district.The characteristics of this Terminal Type are, because the existence of location estimation method error, the ping-pong that the changing method that adopts position-based to estimate may cause position-based to switch, adopt changing method then may can't when distinguishing more, in time obtain switching because moving velocity of terminal is very fast relatively based on signal strength signal intensity.
The method for switching booking that described positional information is auxiliary, refer to characteristics at the vague category identifier portable terminal, at first utilize location estimation information to judge whether terminal has entered the sub-district crossover region, if enter crossover region, then on the one hand, determine the reservation cell set of the sub-district composition of formation sub-district crossover region, the sub-district needs that belong in the reservation cell set are the portable terminal channel reservation in advance, and finish preparation relevant in the handoff procedure.On the other hand, employing is based on the changing method of signal strength signal intensity, judge whether terminal needs to switch, in case need to switch, then can switch to apace according in the Target cell in the reservation cell set of determining based on the signal strength signal intensity changing method, because ready in Target cell for the admittance portable terminal.Thereby in time continue, avoid switching call drop for portable terminal provides to switch.
Described best changing method refers to the changing method that can access more excellent performance of handoffs.
Described changing method can be applicable to adopt the individual layer and the multilayer wireless mobile communications network of Microcell structure, is particularly useful for the soft cell wireless communication networks of layering that covers based on soft sub-district spaced antenna.
For the two kinds of changing methods that adopt among the present invention program based on signal strength signal intensity and position-based estimation, wherein the changing method based on signal strength signal intensity is more wide in range notion, it can be the method that adopts among the embodiment, also can be to utilize communication of mobile terminal signal quality index of correlation as any method of switching foundation.Changing method as for the position-based estimation, can adopt document 2 (Chinese invention patent application: " a kind of changing method of the wireless communication system based on speed and position ", application number: in 200410089455.1) method of Ti Chuing, but for the method for velocity estimation and location estimation can be velocity estimation and localization method in any mobile communication, the precision that need can reach according to distinct methods only, the type of the regulating the speed upper limit and speed type lower limit get final product.
Description of drawings
Fig. 1 is the logic function floor map of the present invention a kind of embodiment of being applied to the soft cell-radio network of layering;
Fig. 2 is that the soft sub-district of an embodiment of the present invention spaced antenna covers schematic diagram;
Fig. 3 is that an embodiment of the present invention is distinguished changing method judgement schematic flow sheet;
Fig. 4 is that an embodiment of the present invention is based on signal strength signal intensity changing method schematic diagram;
Fig. 5 is that an embodiment of the present invention is based on signal strength signal intensity switching flow schematic diagram;
Fig. 6 is the auxiliary method for switching booking schematic flow sheet of an embodiment of the present invention positional information;
Embodiment
Below be applied to distributing antenna system with changing method of the present invention the soft cell-radio network system of layering be that example is described in further detail.
Described changing method at first needs the performance according to speed estimation method that adopts in the spatial sampling process and location estimation method, determines the thresholding of portable terminal speed type classification is finished the judgement of sorted switching method.Need determine to finish the required system parameters of its switching for adopting based on the low speed portable terminal of signal strength signal intensity changing method, as handoff threshold, hysteresis margin and terminal receiving sensitivity etc. (consult document 3:P.P.Gregory. " Trends in Handover Design; " IEEECommun.Mag., pp.82-90, March 1996.).Need determine the system parameters that position switching method is required for the high speed mobile terminal that adopts position-based estimation changing method, (consult document 2: the Chinese invention patent application: " a kind of changing method of the wireless communication system based on speed and position ", application number: 200410089455.1) as small area shape and size, crossover region width etc.Then need to adopt the auxiliary method for switching booking of positional information for the vague category identifier terminal, need binding site to estimate and two kinds of changing methods of signal strength signal intensity, for the user provides in time switching reliably.
According to the performance of speed estimation method that adopts in the spatial sampling process and location estimation method, determine speed type upper limit v
Threshold_upWith speed type lower limit v
Threshold_low, translational speed adopts the changing method of position-based estimation will obtain more excellent performance of handoffs greater than the portable terminal of the upper limit.Translational speed adopts the changing method based on signal strength signal intensity will obtain more excellent performance of handoffs less than the portable terminal of lower limit, and is positioned at velocity ambiguity district [v for the velocity estimation result
Threshold_low, v
Threshold_up] in portable terminal then need to adopt the auxiliary method for switching booking of positional information.With reference to Fig. 3, changing method judgement concrete steps are as follows:
Step S3-1, the velocity estimation that sampling is adopted to system space and the precision property of location estimation method are assessed.
Step S3-2 according to the accuracy evaluation result, determines speed type upper limit v
Threshold_up
Step S3-3 according to the accuracy evaluation result, determines speed type lower limit v
Threshold_low
Step S3-4 carries out spatial sampling to the portable terminal of connecting system, obtains the v as a result of portable terminal velocity estimation
Est
Step S3-5 judges v
Est〉=v
Threshold_upIf set up then change step S3-8.
Step S3-6 judges v
Est≤ v
Threshold_lowIf set up then change step S3-9.
Step S3-7 is the auxiliary method for switching booking of terminal chosen position information.Change step S3-10.
Step S3-8 is the changing method of terminal selection position-based estimation.Change step S3-10.
Step S3-9 is the changing method of terminal selection based on signal strength signal intensity.
Step S3-10 judges whether terminal finishes demand for services, if not, changes step S3-4.
Step S3-11 finishes.
Implementation process for three kinds of different changing methods will provide below.
1, determining based on signal strength signal intensity changing method and system parameters thereof
Can adopt relative signal intensity criterion based on the changing method of signal strength signal intensity, carry out handover when the signal strength signal intensity that only allows portable terminal to be lower than specified thresholds and adjacent cell in the signal level of current area is higher than given hysteresis margin of current area with hysteresis margin and thresholding regulation.
As shown in Figure 4, when portable terminal (4-1) by Cell_1 (4-2) edge in the mobile process of Cell_2 (4-3), the signal strength signal intensity SS that portable terminal receives from Cell_1
1(4-4) will constantly reduce, and from the signal strength signal intensity SS of Cell_2
2(4-5) constantly increase.In order in time to finish the generation that ping-pong is avoided in switching again, need to determine signal strength signal intensity handoff threshold HD_Threshold (4-6) and switch hysteresis margin h (4-7).
The selection of signal strength signal intensity handoff threshold and switching hysteresis margin is relevant with the movement speed v (4-9) of the receiving sensitivity Sensitivity (4-8) of terminal and terminal.In the low speed portable terminal, speed terminal faster need be chosen higher signal intensity handoff threshold and hysteresis margin, to guarantee in time to find the switching demand of terminal, for slow low speed portable terminal, as the pedestrian or static less than the user, then can choose lower relatively signal strength signal intensity handoff threshold and hysteresis margin, but must satisfy HD_Threshold＞Sensitivity+h.With reference to Fig. 5, it is as follows to switch concrete steps:
Step S5-1 carries out spatial sampling to portable terminal, obtains cell signal quality information SS
1And SS
2
Step S5-2 is if satisfy SS
1≤ HD_Threshold illustrates that then current area Cell_1 can not need to prepare to start handoff procedure for terminal provides reliable service.Otherwise change step S5-1.
Step S5-3 is if satisfy SS
1〉=Sensitivity, then terminal can also be kept communication, can switch, otherwise switch call drop, changes step S5-7.
Step S5-4 is if satisfy SS
2-SS
1＞h, then the signal SS of sub-district Cell_2
2Signal SS with Cell_1
1Compare, quality is enough good, can switch among the Cell_2 of sub-district and go.Otherwise, also there is no need to switch, change step S5-1.
Step S5-5, the start-up system handoff procedure.
If step S5-6 system's handover success, promptly has resource can distribute to terminal and uses in the Target cell, and terminal also is in normal communication state, then changes step S5-8.Otherwise change step S5-7.
Step S5-7, terminal in handoff procedure owing to fail in time to obtain to switch call drop, or get clogged because the adjacent cell No Assets can distribute, discharge the system resource that terminal originally took, commentaries on classics step S5-9.
Step S5-8 behind the handover success, finishes the resource allocation of terminal in new sub-district Cell_2, and discharge the resource that terminal takies in Cell_1.
Step S5-9 finishes to switch.
2, position-based is estimated determining of changing method and system parameters thereof
Changing method that position-based is estimated and system parameters thereof fix on document 2 (Chinese invention patent application: " a kind of changing method of the wireless communication system based on speed and position " really, application number: described in detail 200410089455.1): this invents described changing method, adopts following steps:
At first, utilize spatial sampling,, calculate the distance of portable terminal and center of housing estate in time according to the mobile terminal locations results estimated;
Secondly, the distance of portable terminal and center of housing estate is converted into equivalence value, when this equivalence value surpasses given threshold value, starts switching;
At last,, determine Target cell, finish switching according to the selection strategy of Target cell.
Described spatial sampling refers in user's moving process, and User Status is in time sampled, and comprises the information such as channel quality of user's position, speed and the current use of user; The frequency f of sampling
SampleSpeed v with its respective user j
jRelevant, f
Sample∝ v
j, guarantee in time to obtain user state information for quick user.
Described equivalence value is a normalization equivalence penetraction depth, refers to the ratio of the equivalent penetraction depth equivalent cell radius corresponding with it, its role is to that the mobile subscriber of diverse location provides unified a tolerance in the sub-district in order to be in.
Described equivalent penetraction depth is meant that portable terminal enters the equivalence value of the Zone switched degree of depth, and this equivalence radius of society is meant the length of soft center of housing estate to the vertical line section of soft sub-district each minute area edge.
This equivalence penetraction depth obtains by sciagraphy: be that distance with portable terminal and center of housing estate projects on the vertical line of center of housing estate and of living in minute area edge of portable terminal, this section projector distance promptly is the equivalent penetraction depth of portable terminal.
Further, this method can be applied to the soft cell-radio network architecture of layering that covers based on soft sub-district spaced antenna.
Described soft sub-district spaced antenna covers and comprises sub-district crossover region antenna and sub-district internal antenna, sub-district crossover region antenna can be simultaneously for constituting the sub-district service of crossover region, the mobile subscriber's that the width of crossover region is then served according to corresponding soft cell layer in the plane, pairing soft sub-district, soft sub-district speed type and average crossover region are determined residence time.
The selection strategy of described Target cell refers to, by the candidate cell set that the sub-district constituted that constitutes portable terminal crossover region of living in, choose a Target cell, the normalization distance of this Target cell center and portable terminal is the shortest in all candidate cells, and the portable terminal that available resources can be distributed to needs switching is arranged.
The normalization distance of described Target cell center and portable terminal refers to the ratio of distance with the Target cell circumradius of Target cell center and portable terminal, and its role is to provides a unified tolerance for the Target cell of different sizes.
Particularly, in the soft cell signal overlay planes that provides by distributing antenna system, as shown in Figure 2, utilize spatial sampling, in time, calculate the distance of portable terminal and center of housing estate according to the mobile terminal locations results estimated, and according to projection algorithm, the distance of portable terminal and center of housing estate is converted into equivalent penetraction depth, when normalization equivalence penetraction depth surpasses given threshold value, start and switch, according to the selection strategy of Target cell, determine available Target cell, finish switching.
Described soft sub-district spaced antenna covers and is made of sub-district crossover region antenna and sub-district internal antenna, sub-district crossover region antenna can be simultaneously for constituting the sub-district service of crossover region, the mobile subscriber's that the width of crossover region is then served according to corresponding soft cell layer in the plane, pairing soft sub-district, soft sub-district speed type and average crossover region are determined residence time.
Described crossover region refers to the user from entering crossover region to leaving the needed time of crossover region along the direction with the crossover region edge-perpendicular residence time.
Described average crossover region refers to the assembly average of residence time of different user crossover region in the sub-district residence time.
Described spatial sampling refers in user's moving process, and User Status is in time sampled, and comprises the information such as channel quality of user's position, speed and the current use of user.The frequency f of sampling
SampleSpeed v with its respective user j
jRelevant, f
Sample∝ v
j, guarantee in time to obtain user state information, and the processing expenditure of system is little for user at a slow speed for quick user.For the soft cell layer of difference, processing method is identical, the requirement that different only is to disposal ability, and different layers had just possessed different disposal abilities originally in hierarchy.
This is invented the distance that described projection algorithm refers to portable terminal and center of housing estate and projects on the vertical line of center of housing estate and of living in minute area edge of portable terminal, obtains the equivalent penetraction depth of portable terminal.
Described equivalent penetraction depth refers to the equivalence value that portable terminal enters the Zone switched degree of depth.
Described normalization equivalence penetraction depth refers to the ratio of the equivalent penetraction depth equivalent cell radius corresponding with it, and the mobile subscriber of diverse location provides a unified tolerance in the sub-district in order to be in.
Described equivalent cell radius refers to the length of soft center of housing estate to the vertical line section of soft sub-district each minute area edge.
The selection strategy of described Target cell refers to, by the candidate cell set that the sub-district constituted that constitutes portable terminal crossover region of living in, choose a Target cell, the normalization distance of this Target cell center and portable terminal is the shortest in all candidate cells, and the portable terminal that available resources can be distributed to needs switching is arranged.
The normalization of described Target cell center and portable terminal distance refers to, and the ratio of the distance of Target cell center and portable terminal and Target cell circumradius is for the Target cells of different sizes provide unified a tolerance.
This invents the characteristics of described changing method according to the soft cell-radio network architecture of layering, utilization in the soft cell-radio network of layering to the high-precision location estimation result of portable terminal as the foundation of switching, and no longer adopt traditional changing method based on signal strength signal intensity, solved the problem of the switching ping-pong that exists in the conventional cell.Utilize the characteristics of the soft cell-radio network architecture of layering, solved the problem that high-speed mobile user is switched complexity.For the soft cell layer of difference, can adopt identical handoff algorithms, simplified system complexity, realize the characteristics of the soft sub-district of layering switching controls complexity manageable, and reached performance of handoffs preferably.
3, the auxiliary method for switching booking of vague category identifier location information of mobile terminal
Described vague category identifier portable terminal refers to the portable terminal that the velocity estimation value is arranged in the velocity ambiguity district.Because the existence of velocity estimation and location estimation method error, can not directly determine the changing method that it is corresponding for this class portable terminal by estimated result, and need the auxiliary method for switching booking of employing positional information, with reference to Fig. 6, the method for switching booking concrete steps that positional information is assisted are as follows:
Step S6-1 carries out the spatial sampling location estimation by Serving cell control centre to portable terminal.
Step S6-2 judges whether portable terminal enters the sub-district crossover region, if not, changes step S6-1.
Step S6-3, Serving cell control centre sets up the reservation cell set to network control center's application.
Step S6-4, the network control center will constitute the adjacent cell of portable terminal crossover region of living in and set up the reservation cell set, and the sub-district in the reservation cell set sends handover preparation information.
Step S6-5, each is preengage the sub-district and sends physical message and resource obligate information separately and start the reservation timer to the network control center, and the mark subscription state is effective.
Step S6-6, Serving cell control centre adopts the changing method based on signal strength signal intensity, and portable terminal is carried out the monitoring of spatial sampling signal strength signal intensity.
Step S6-7, each is preengage the sub-district and judges that the reservation timer whether greater than 0, if not, then changes step S6-9.
Step S6-8, each is preengage the sub-district reservation timer is upgraded (deducting the passage of time amount).Change step S6-11.
Step S6-9 judges whether reservation is effective, if not, changes step S6-11.
Step S6-10, corresponding reservation sub-district is released to the terminal reserved resource, and the mark reservation is invalid.
Step S6-11 need to judge whether to switch, and if not, changes step S6-6.
Step S6-12 judges whether reservation is effective, if not, changes step S6-14.
Step S6-13 is switched also by the information of Serving cell control centre notice portable terminal Target cell by network control center select target sub-district from the reservation cell set.Change step S6-15.
Step S6-14 determines Target cell by network control center's employing based on the changing method of signal strength signal intensity, to Target cell application switchable resource, and by the information that Serving cell control centre notifies the portable terminal Target cell, switches.
Step S6-15, terminal inserts Target cell.
Step S6-16, former Serving cell discharges resource.
Step S6-17 finishes to switch.
The above-mentioned description to embodiment can make those skilled in the art can understand and use the present invention.The person skilled in the art obviously can make various modifications to these embodiment soon, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (9)
1, a kind of sorted switching method that is used for mobile radio system is characterized in that: comprise step: at first, and according to the v as a result of portable terminal velocity estimation
Est, terminal is divided into high-speed terminal, low speed terminal and vague category identifier portable terminal;
Secondly, when terminal need be switched, be scheduling and the distribution of in time finishing system resource, for terminal provides the continuous and reliable communication service, changing method is used in classification: for high speed mobile terminal, and in its corresponding district, the changing method that adopts position-based to estimate; For the low speed portable terminal, in its corresponding district, adopt changing method based on signal strength signal intensity; Then adopt the auxiliary method for switching booking of positional information for the vague category identifier portable terminal.
2, the sorted switching method that is used for mobile radio system according to claim 1 is characterized in that: if the result of velocity estimation satisfies v
Est〉=v
Threshold_upThe speed type upper limit then is divided into high-speed terminal with terminal; If the result of velocity estimation satisfies v
Est≤ v
Threshold_lowThe speed type lower limit then is divided into low speed terminal with terminal; If velocity estimation result does not satisfy above-mentioned two conditions, then terminal is divided into the vague category identifier portable terminal, condition is v
Threshold_low≤ v
Threshold_up
3, the sorted switching method that is used for mobile radio system according to claim 2 is characterized in that: described speed type upper limit v
Threshold_up, referring to performance according to speed estimation method that adopts in the spatial sampling process and location estimation method, definite speed is divided thresholding, and translational speed adopts the changing method of position-based estimation will obtain more excellent performance of handoffs greater than the portable terminal of this upper limit;
Described speed type lower limit v
Threshold_low, referring to performance according to speed estimation method that adopts in the spatial sampling process and location estimation method, definite speed is divided thresholding, and translational speed adopts the changing method based on signal strength signal intensity will obtain more excellent performance of handoffs less than the portable terminal of this lower limit.
4, the sorted switching method that is used for mobile radio system according to claim 3, it is characterized in that: described more excellent performance of handoffs, refer under the prerequisite that guarantees certain handover success probability, compare with the speed threshold that adopts other, it is less that portable terminal is finished the switching times that once conversation needs.
5, the sorted switching method that is used for mobile radio system according to claim 1, it is characterized in that: described vague category identifier portable terminal, refer to the velocity estimation value and be arranged in the portable terminal in velocity ambiguity district, the characteristics of this Terminal Type are, because the existence of location estimation method error, the ping-pong that the changing method that adopts position-based to estimate may cause position-based to switch, adopt changing method then may can't when distinguishing more, in time obtain switching because moving velocity of terminal is very fast relatively based on signal strength signal intensity.
6, the sorted switching method that is used for mobile radio system according to claim 5, it is characterized in that: described velocity ambiguity district, refer to error performance according to the speed estimation method that when spatial sampling, adopts, the speed zoning of determining, the velocity estimation value is arranged in the portable terminal in this zone can not only determine the changing method that it is corresponding according to its speed characteristics, and needs the auxiliary method for switching booking of employing positional information.
7, the sorted switching method that is used for mobile radio system according to claim 1, it is characterized in that: the method for switching booking that described positional information is auxiliary, refer to characteristics at the vague category identifier portable terminal, at first utilize location estimation information to judge whether terminal has entered the sub-district crossover region, if enter crossover region, then on the one hand, determine the reservation cell set of the sub-district composition of formation sub-district crossover region, the sub-district needs that belong in the reservation cell set are the portable terminal channel reservation in advance, and finish preparation relevant in the handoff procedure; On the other hand, employing is based on the changing method of signal strength signal intensity, judge whether terminal needs to switch, in case need to switch, then can switch to apace according in the Target cell in the reservation cell set of determining based on the signal strength signal intensity changing method, ready in Target cell for the admittance portable terminal; Thereby in time continue, avoid switching call drop for portable terminal provides to switch.
8, according to arbitrary described sorted switching method that is used for mobile radio system in the claim 1 to 7, it is characterized in that: described changing method is applied to adopt the individual layer and the multilayer wireless mobile communications network of Microcell structure.
9, according to arbitrary described sorted switching method that is used for mobile radio system in the claim 1 to 7, it is characterized in that: described changing method is applied to the soft cell wireless communication networks of layering based on the covering of soft sub-district spaced antenna.
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| CNB2005100256235A CN100479596C (en) | 2005-04-29 | 2005-04-29 | Sorted switching method for wireless mobile communication system |
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| CNB2005100256235A CN100479596C (en) | 2005-04-29 | 2005-04-29 | Sorted switching method for wireless mobile communication system |
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| US8855637B2 (en) * | 2007-03-21 | 2014-10-07 | Wi-Lan, Inc. | Methods and apparatus for performing handoff based on the mobility of a subscriber station |
| CN101184266B (en) * | 2007-12-18 | 2011-04-06 | 北京西塔网络科技有限公司 | Information release device and information release method |
| EP2134119A1 (en) * | 2008-06-11 | 2009-12-16 | Mitsubishi Electric R&D Centre Europe B.V. | Method and a device for deciding if the operating mode of a telecommunication device has to be switched into a different operating mode |
| CN101925148B (en) * | 2009-06-11 | 2013-01-23 | 上海无线通信研究中心 | Method for estimating speed class of mobile terminal in multilevel cellular system |
| CN102026326B (en) * | 2009-09-21 | 2014-04-30 | 中兴通讯股份有限公司 | Communication method and system under high-speed mobile scene |
| CN102387552B (en) * | 2011-10-21 | 2017-07-21 | 南京中兴新软件有限责任公司 | A kind of method of adjustment of service quality QoS, system, equipment and device |
| CN102883387B (en) * | 2012-09-27 | 2015-03-18 | 大连环宇移动科技有限公司 | Base station switching method on basis of assistance of precision positioning messages |
| CN103813394B (en) | 2012-11-05 | 2017-08-18 | 电信科学技术研究院 | Auxiliary information is reported and method for sending information and equipment |
| CN105848226A (en) * | 2016-03-24 | 2016-08-10 | 广东欧珀移动通信有限公司 | Calling speed improvement method and calling speed improvement device |
| CN109309900B (en) | 2017-07-27 | 2020-10-23 | 维沃移动通信有限公司 | Measurement method and user terminal |
| CN110072264B (en) * | 2019-05-28 | 2021-02-02 | 重庆邮电大学 | Low-orbit satellite system switching method |
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