CN100426920C

CN100426920C - Method for measuring mobile station speed in mobile communication system

Info

Publication number: CN100426920C
Application number: CNB2004100790162A
Authority: CN
Inventors: 续斌
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2004-09-02
Filing date: 2004-09-02
Publication date: 2008-10-15
Anticipated expiration: 2024-09-02
Also published as: CN1744760A

Abstract

The present invention relates to a method for measuring the speed of a mobile station in mobile communication systems. For overcoming the disadvantages of complex calculation and great system spending of the prior art, the method utilizes the relativity between the changing frequency of a best cell of the mobile station and the moving speed of the mobile station to judge the moving speed of the mobile station. The moving speed of the mobile station has the judgment principle that if the time required by changing the best cell of the mobile station for prearranged N times is less than a first threshold value, the mobile station is judged to move quickly. If the time required by changing the best cell of the mobile station for prearranged M times is larger than a second threshold value and the difference between the moment that the best cell changes for the last time and the current moment is larger than a third threshold value, the mobile station is judged to move slowly.

Description

A kind of method of measuring mobile station speed in the mobile communcations system

[technical field]

The present invention relates to the mobile communication technology field, relates in particular to a kind of method of measuring motion velocity of mobile station in the mobile communcations system.

[background technology]

For a mobile communcations system, it can be arranged net according to layered cell structure (HCS).The sub-district of different layers covers identical zone, and wherein area coverage is big is referred to as macrocell 10, and area coverage is little is referred to as Microcell 20, as shown in Figure 1.Microcell is mainly used in to receive and moves at a slow speed and the big user of traffic carrying capacity, and macrocell is mainly used in and receives fast moving and the less user of traffic carrying capacity.Macrocell and Microcell are worked in coordination, and can play and reduce inessential switching, optimize network performance, the effect of improving network quality.

Except tradition causes the switching because of wireless quality, the movement velocity of travelling carriage also can cause switching.But these two kinds switchings or distinguishing.The switching that the wireless quality reason causes is a kind of switching that must carry out, might not cause call drop because just do not switch; And be a kind of optimization to network by the switching that motion velocity of mobile station triggers.Cause the system handles complexity if carry out this based on the switching of optimizing, the system loading increase then is a kind of way that loses more than gain.Therefore, a kind of method of efficient judgement motion velocity of mobile station just becomes the switch decision prerequisite of carrying out based on optimizing.

The patent of motion velocity of mobile station in more existing both at home and abroad at present measurement floored communities.As No. 5907808 patent of the U.S. disclosed a kind of grand/Microcell in based on the handoff technique that detects the fast moving user.The thought of this invention is by detecting travelling carriage by the time of Microcell and the deflection of turnover Microcell, determining the movement velocity of travelling carriage.If it is different with the deflection that leaves the sub-district that the time of travelling carriage by Microcell enters the sub-district less than a default thresholding and travelling carriage, think then that motion velocity of mobile station is high and trigger to switch to macrocell.But the shortcoming of this technology is that the parameter of measuring is more, and especially the certainty of measurement of deflection is relatively poor, and efficient is not high.

In addition, application number is that 02112024.2 Chinese patent has disclosed a kind of method of measurement of motion velocity of mobile station in the mobile communication system.This invention is the movement velocity that decides travelling carriage by the change frequency of measurement unit's best microcell base station of the measured signal quality of travelling carriage in the time.If the best Microcell change frequency of the measured signal quality of travelling carriage surpasses a default thresholding in the unit interval, then think the motion velocity of mobile station height.The shortcoming of this technology is owing to will consider the unit interval, so need the cycle to carry out a delay procedure to add up the change frequency of best cell in this unit interval, but as a jumbo mobile communcations system, all the cycle carries out the load that delay procedure brought and can not ignore for each user.

[summary of the invention]

For this reason, the technical problem to be solved in the present invention is to overcome calculation of complex in the prior art, and the shortcoming that overhead is bigger proposes the method for motion velocity of mobile station in a kind of efficient measurement mobile communcations system.

For solving the problems of the technologies described above, the invention provides a kind of method of measuring mobile station speed in the mobile communcations system.This method utilizes the correlation of frequency that the travelling carriage best cell changes and travelling carriage translational speed to adjudicate the translational speed of travelling carriage.

Wherein, the principle of the translational speed of judgement travelling carriage is: if the travelling carriage best cell changes default N required time less than first threshold, then judge the travelling carriage fast moving, if the travelling carriage best cell changes moment that default M required time change greater than second threshold value and last best cell and current time difference greater than the 3rd threshold value, judge that then travelling carriage is mobile at a slow speed.

This method can comprise the steps:

(a) be provided with one and be used to adjudicate the timer that travelling carriage moves at a slow speed, its scheduled time scope is T, and the system time during this timer of recording setting is T _Set, make user to be measured share this timer;

(b) enter wait state;

(c) when moving table measuring report triggering best cell changes, the system time in its formation S during with the changing of the principle of first in first out record best cell;

(d) if having predetermined N among the formation S _FastThe time that inferior best cell changes, then carry out step (e).Otherwise return step (b);

(e) if the time difference of system time that the last best cell of preserving changes among the formation S and the system time preserved the earliest less than a judgement fast moving thresholding T who is scheduled to _Fast, then adjudicating this travelling carriage is fast moving, otherwise returns step (b);

(f) when mobile timer exceeds time range T at a slow speed, travel through all users to be measured, if Subscriber Queue S is for being later than T constantly among empty or the formation S _SetThe best cell that triggers changes number of times less than predetermined threshold N _SlowAnd the difference of last holding time is greater than thresholding T among current system time and the formation S _Slow, then adjudicate travelling carriage for moving at a slow speed, traveled through all users to be measured, return step (a).

Compared with prior art, whether the method for the invention is calculated simple, move at the judgement travelling carriage to need not the opening timing program when fast, and all users shared a timer when judgement travelling carriage translational speed was slow, it is minimum that system is increased extra load, has high execution efficient.

[description of drawings]

The present invention is described in detail below in conjunction with drawings and Examples:

Fig. 1 is an existing mobile communcations system layered cell structure schematic diagram.

Fig. 2 is for measuring control and measurement report message schematic flow sheet between network side of the present invention and the travelling carriage.

Fig. 3 adjudicates the flow chart of motion velocity of mobile station for the present invention.

[embodiment]

Please refer to Fig. 3, Fig. 3 is the flow chart of the judgement motion velocity of mobile station of the specific embodiment of the invention.Wherein relevant parameter is mainly:

The time range of the Global Timer that T-judgement travelling carriage moves at a slow speed.

N _FastThe number of times that-best cell changes.

T _FastDuring-travelling carriage fast moving, best cell changes N _FastInferior needed maximum duration.

N _Slow-be the travelling carriage translational speed maximum times that best cell changes in the timer T time range when slow.

T _SlowThe minimum threshold of the system time difference that the system time in the overtime moment of-timer T and last best cell change.

In addition, each user to open a length be N _FastFifo queue S, be responsible for the nearest N of record _FastSystem time when inferior best cell changes.

The setting purpose of above-mentioned thresholding and theoretical foundation be because: except indivedual because Zone switched wireless environment fluctuation causes the situation that the travelling carriage best cell changes, most travelling carriage best cell change with the travelling carriage geographical position on mobile be relevant.By the sluggish thresholding that suitable triggering best cell changes judgement is set, can filter out because the situation that the wireless environment fluctuation causes the travelling carriage best cell to change, the change of travelling carriage best cell just must be relevant with the variation in travelling carriage geographical position like this.The frequency that the travelling carriage best cell changes just must be relevant with the translational speed of travelling carriage.

Main flow process below in conjunction with concrete steps explanation the inventive method.

Step 301, the time range T of timer is adjudicated in the network side setting at a slow speed, and the system time of recording setting timer is T _SetThe form of system time can be second, millisecond or any self-defining form without limits.Network side can be obtained system time from hardware single board or operating system.In order to embody system timer, improve treatment effeciency, in the present embodiment this timer is put into the veneer one-level.Be understandable that this timer also can be put into the sub-district one-level.After the design, a plurality of Node B of administration have a plurality of sub-districts under the NodcB on the veneer, and a plurality of users are arranged under each sub-district like this.

Flow process as shown in Figure 2, the network side equipment of mobile communcations system can obtain the information that the current best cell of travelling carriage changes according to the measurement report of travelling carriage.Therefore, when some users set up calling, network side was obtained the parameter N of judgement travelling carriage fast moving earlier _Fast, T _Fast, the parameter N that the judgement travelling carriage moves at a slow speed _Slow, T _SlowAnd changing the number of times parameter according to best cell, to set up a length be N _FastFifo queue S, the measurement of opening travelling carriage then according to flow process as shown in Figure 2.

Then, enter wait state shown in step 302 again.

In step 303, network side is received the measurement report that the travelling carriage best cell changes.

In step 304, network side reads the system time of receiving this measurement report, is kept among this user's fifo queue S.

In step 305,, otherwise return step 302 if this user satisfies following two conditions simultaneously then carry out step 306:

1. preserved N among the formation S _FastThe time that individual best cell changes.

2. the N that preserves among the formation S _FastIndividual (depositing formation S at last in) and the 1st (depositing in the earliest row S) best cell change the time difference of time less than T _Fast

In step 306, make the judgement of travelling carriage fast moving.Return again and carry out step 302.

In step 307, network side is adjudicated overtime message at a slow speed, begins to travel through all users.

In step 308, if a certain user satisfy following two conditions carry out step 309 first, otherwise carry out step 310.

1. formation S is empty, or

2. be later than T constantly among the formation S _SetThe best cell that triggers changes number of times less than thresholding N _SlowAnd current system

The difference of last holding time is greater than thresholding T among system time and the S _Slow

In step 309, make the judgement that travelling carriage moves at a slow speed.Return again and carry out step 310.

In step 310,, otherwise carry out step 308 if all users have traveled through then carry out steps 301.

In sum, this method is calculated simple, and the parameter that relates to is the method for motion velocity of mobile station in a kind of efficient measurement mobile communcations system seldom, especially has obviously useful effect for the mobile communcations system of commercialization.

Need to prove; above-mentioned explanation only is the detailed description to preferred embodiment of the present invention; narration only is explanation realizability of the present invention and outstanding effect thereof; concrete feature can not be used as the restriction to technical scheme of the present invention, and protection scope of the present invention should be as the criterion with appended claims of the present invention.

Claims

1. method of measuring mobile station speed in the mobile communcations system is characterized in that utilizing the correlation of frequency that the travelling carriage best cell changes and travelling carriage translational speed to adjudicate the translational speed of travelling carriage; If the travelling carriage best cell changes default N required time less than first threshold, then judge the travelling carriage fast moving, if the travelling carriage best cell changes moment that default M required time change greater than second threshold value and last best cell and current time difference greater than the 3rd threshold value, judge that then travelling carriage is mobile at a slow speed.

2. the method for mobile station speed in the measurement mobile communcations system as claimed in claim 1 is characterized in that it comprises the steps:

A is provided with one and is used to adjudicate the timer that travelling carriage moves at a slow speed, and its scheduled time scope is T, and the system time during this timer of recording setting is T _Set, make user to be measured share this timer;

B enters wait state;

When c changes when moving table measuring report triggering best cell, the system time in its formation S during with the changing of the principle of first in first out record best cell;

D is if having predetermined N among the formation S _FastThe time that inferior best cell changes, then carry out step e, otherwise return step b, N _FastFor best cell changes number of times;

If the time difference of system time that the last best cell of preserving changes among the e formation S and the system time of preserving the earliest is less than a predetermined judgement fast moving thresholding T _Fast, then adjudicating this travelling carriage is fast moving, otherwise returns step b;

F travels through all users to be measured when mobile timer exceeds time range T at a slow speed, if Subscriber Queue S is for being later than T constantly among empty or the formation S _SetThe best cell that triggers changes number of times less than predetermined threshold N _SlowAnd the difference of last holding time is greater than thresholding T among current system time and the formation S _Slow, then adjudicate travelling carriage for moving at a slow speed, traveled through all users to be measured, return step a; Wherein, N _SlowBe the travelling carriage translational speed maximum times that best cell changes in the timer T time range when slow.

3. the method for mobile station speed in the measurement mobile communcations system as claimed in claim 1, when it is characterized in that being scheduled to the travelling carriage fast moving, best cell changes N _FastInferior needed maximum duration is judgement fast moving thresholding T _FastA scheduled time scope that is intended for adjudicating the timer that travelling carriage moves at a slow speed is T; When predetermined travelling carriage was mobile at a slow speed, the max threshold number of times that best cell changes in the timer T time range was N _SlowAnd a difference of the system time that the system time of predetermined moment of time-out of timer and last best cell change is greater than the mobile at a slow speed thresholding T of judgement _SlowThis method comprises the steps:

A is T based on the scheduled time scope that veneer is provided with above-mentioned timer, and the system time of this timer setting of recording setting is T _Set, make all users on this veneer share this timer;

B enters wait state;

When c changes when moving table measuring report triggering best cell, in a formation S, preserve the system time of this triggering, the system time when this formation S is used for the changing of the principle record best cell of first in first out;

If have N among the d formation S _FastThe time that inferior best cell changes, then carry out step e, otherwise return step b;

If among the e formation S system time of the last best cell of preserving and the earliest time difference of the system time of preservation less than above-mentioned judgement fast moving thresholding T _Fast, then adjudicating this travelling carriage is fast moving, otherwise returns step b;

F travels through all users to be measured when mobile timer exceeds time range T at a slow speed, if Subscriber Queue S is for being later than T constantly among empty or the formation S _SetThe best cell that triggers changes number of times less than thresholding N _SlowAnd the difference of last holding time is greater than thresholding T among current system time and the S _Slow, then adjudicate travelling carriage for moving at a slow speed, traveled through all users to be measured, return step a.