CN1753554A - Implementing method of relay switchover judging process - Google Patents
Implementing method of relay switchover judging process Download PDFInfo
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- CN1753554A CN1753554A CN 200410080058 CN200410080058A CN1753554A CN 1753554 A CN1753554 A CN 1753554A CN 200410080058 CN200410080058 CN 200410080058 CN 200410080058 A CN200410080058 A CN 200410080058A CN 1753554 A CN1753554 A CN 1753554A
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Abstract
This invention discloses a realization method for a relay switching judgment process, in which, RNC judges if the signal quality or strength of the area the UE serves at the present are decreased and lower than the threshold value, if so, said UE is located to get the location information of said UE and determines the adjacent areas related to said UE position then selects several areas with strong signals from the related adjacent areas as the candidate zones of the relay switch areas then carries out the reception judgment to the candidate areas orderly and selects one of allowed areas as the target area of the relay switch of the UE to begin the execution process.
Description
Technical field
The present invention relates to TD-SCDMA (TD SDMA access) mobile communcations system, relate in particular to the implementation method of a kind of relay switchover judging process in this system.
Background technology
Baton handover (Baton Handover) is one of core technology of TD-SCDMA mobile communication system.Its design philosophy is to utilize technology such as smart antenna and uplink synchronous, on the basis that the distance and bearing to UE (portable terminal) positions, the azimuth-range of UE is judged as supplementary whether present UE has moved to the close region of the adjacent base station that can switch.If UE enters the switch area, then RNC (radio network controller) preparation of notifying this base station to carry out switching, thus reach fast, the reliable and efficient purpose of switching.Relay baton is transmitted in the relay of this process in track and field events, thereby is referred to as baton handover visually.
Baton handover is a kind of new changing method between direct-cut operation and soft handover.Compare with soft handover, the both has higher handover success rate, lower cutting off rate and less advantages such as uplink interference.Their difference is that baton handover does not need to have simultaneously a plurality of base stations to provide service for a portable terminal, thereby it is more to overcome the channel resource that soft handover need take, the signaling complexity causes system burden to increase the weight of, and increases shortcoming such as dl interference.Compare advantage such as the both has higher resource ROA, and the signaling traffic load of comparatively simple algorithm, and system is lighter relatively with direct-cut operation.Difference is that baton handover disconnects former base station and sets up communication link with target BS and almost carry out simultaneously, thereby has overcome the shortcoming that the conventional hard handover cutting off rate is higher, handover success rate is lower.
Therefore, baton handover by with the combination of technology such as smart antenna and uplink synchronous, dexterously the high success rate of soft handover and the high channel ROA of direct-cut operation are integrated, be a kind of changing method with better systematic function.
Baton handover divides three processes: measuring process, judging process and implementation.
Measuring process in the baton handover, traditional soft handover and direct-cut operation all are to carry out under the situation of not knowing the accurate position of UE, therefore need measure all neighbor cells, carry out the selection of switch decision and Target cell according to given handoff algorithms and criterion then.And baton handover is accurately to know to carry out handover measurement under the situation of UE position, comprises to the location survey of UE with to the measurement of candidate cell signal strength signal intensity.The utilization condition that RNC obtains the accurate position of UE is key technology intelligent antenna technology and the simultaneous techniques of TD-SCDMA.
The judging process of baton handover, in the process of baton handover, need be according to various metrical informations and integrated system information, according to certain criterion and algorithm, adjudicate whether UE should switch and how to switch.
The implementation of baton handover, after baton handover started, terminal sent upstream data from the cell-of-origin downlink data receiving to Target cell.
In fact, the measuring process of baton handover and judging process are mutual processes, can think that measuring process is a link in the judging process, and the court verdict of baton handover depends on the accurate of measurement.But in existing standard or other open source literature, also do not relate to for the specific implementation (as judgment condition etc.) of relay switchover judging process.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of implementation method of relay switchover judging process, and according to this method, RNC can judge the condition whether UE satisfies baton handover, and determines a Target cell that is used for baton handover.
In order to solve the problems of the technologies described above, the invention provides a kind of implementation method of relay switchover judging process, may further comprise the steps:
(a) radio network controller judges whether the signal quality of portable terminal current service cell or intensity descend and be lower than threshold value, if carry out next step, otherwise do not carry out baton handover;
(b) radio network controller positions this portable terminal, if can access the positional information of this portable terminal, carries out next step, otherwise does not carry out baton handover;
(c) radio network controller is determined the neighbor cell relevant with this mobile terminal locations according to the positional information of this portable terminal;
(d) radio network controller is selected the higher sub-district of several signal strength signal intensities from described relevant neighbor cell, as the candidate cell that is used for baton handover;
(e) radio network controller carries out acceptance judging to described candidate cell successively, and selects a Target cell that allows the candidate cell of admittance as this relay mobile terminal switching, the implementation of beginning baton handover.
Further, said method also can have following characteristics: when described step (b) radio network controller is located this portable terminal, be the location survey of initiating this portable terminal; Perhaps radio network controller is to obtain from the positional information of this portable terminal of having stored.
Further, said method also can have following characteristics: described step (d) radio network controller is by measuring control messages, indicate this portable terminal to measure the signal strength signal intensity of described relevant neighbor cell, and obtain the higher sub-district of several signal strength signal intensities as described candidate cell according to the measurement report of this portable terminal; Perhaps radio network controller is to select the higher sub-district of several signal strength signal intensities as described candidate cell from the measurement report of relevant neighbor cell of storage.
Further, said method also can have following characteristics: described step (c) radio network controller is to predict the zone that it may move to according to the current location of this portable terminal, and coverage is comprised the relevant neighbor cell of this regional neighbor cell as this portable terminal.
Further, said method also can have following characteristics: when described step (b) radio network controller is located this portable terminal, if allow switching time, then initiate repeatedly location survey to this portable terminal, and calculate the translational speed and the moving direction of this portable terminal according to measurement result repeatedly, determine the zone that this portable terminal may move to position, translational speed, moving direction and the switching time of in step (c), taking all factors into consideration this portable terminal.
Further, said method also can have following characteristics: the threshold value in the described step (a) is meant the good thresholding of portable terminal quality of signals.
Further, said method also can have following characteristics: the threshold value in the described step (a) is meant the good thresholding of the intensity of portable terminal signal.
Further, said method also can have following characteristics: radio network controller is to carry out acceptance judging successively according to the order of described candidate cell signal strength signal intensity in the described step (e), finds behind the candidate cell that can admit with the Target cell of this sub-district as baton handover.
Further, said method also can have following characteristics: when described radio network controller moves this portable terminal and measures the signal strength signal intensity of described relevant neighbor cell by measuring the control messages indication, specify the mode reporting measurement reports of this portable terminal employing reporting events, and the thresholding of configuration signal intensity is as the trigger condition of reporting events.
Further, said method also can have following characteristics: when described radio network controller moves this portable terminal and measures the signal strength signal intensity of described relevant neighbor cell by measuring the control messages indication, specify this portable terminal to adopt the mode reporting measurement reports that periodically reports, radio network controller is found out the higher sub-district of signal strength signal intensity according to the measurement result that reports again.
As from the foregoing, judging process before the present invention carries out by baton handover, the reciprocal process that comprises the measurement and the judgement of baton handover, can judge the condition whether UE satisfies baton handover exactly, and can select a Target cell that is used for baton handover exactly, thereby can guarantee that UE can carry out the baton handover process reliably.
Description of drawings
Fig. 1 is the flow chart of first embodiment of the invention relay switchover judging process.
Fig. 2 is UE and the mutual schematic diagram of RNC in the first embodiment of the invention judging process.
Fig. 3 is current location and the moving direction of embodiment of the invention RNC according to UE, selects the schematic diagram of candidate cell.
Embodiment
First embodiment
Fig. 1 shows the flow process of present embodiment relay switchover judging process, please refer to Fig. 2 simultaneously, and this judging process may further comprise the steps:
In this step, if its signal quality or intensity are also enough good, then baton handover is not carried out in judgement; If its signal quality is between good thresholding of quality and business demand thresholding or be lower than the business demand thresholding, or its signal strength signal intensity is good between signal strength signal intensity and the signal strength signal intensity minimum threshold set between or be lower than the signal strength signal intensity minimum threshold of setting, RNC thinks that current service cell can not provide good business to UE, needs to start the measurement of correlation process of switching.
In this step, the positional information of UE comprises distance and direction.If the signal quality that provides of Serving cell this moment very poor thresholding of business demand (as be lower than) need be finished the switching of minizone as early as possible, can only carry out one-shot measurement; If signal quality still can (as between good thresholding of quality and business demand thresholding), RNC can also initiate repeatedly location survey, obtains repeatedly the positional information of UE, calculates translational speed and the moving direction of UE then.Movement speed v=(S1-S2)/t, wherein: this measuring position of S1, S2 measuring position last time, the time difference of this twice measurement of t.For guaranteeing the accuracy of speed, RNC can average the speed that repeatedly calculates as the translational speed of UE.
6 sub-districts can be arranged at most in the neighbor cell list of UE, the measurement of UE when reducing baton handover, the position that RNC is at first present according to UE, and the translational speed of UE and moving direction (if any), predict the zone that it may move to according to the current location of this portable terminal, coverage is comprised the relevant neighbor cell of this regional neighbor cell as this portable terminal.Judge in conjunction with translational speed, the direction of UE and to help the zone of predicting that accurately UE may move to.
In Fig. 3, RNC is according to judging position, translational speed, moving direction and the switching time (predicted value) of UE that the zone that UE may move to is the shadow region among the figure, this zone is the overlapping region of sub-district A, B and C, therefore RNC selects sub-district A, sub-district B and sub-district C to reduce the scope of UE search measurement neighbor cell as the neighbor cell that UE measures in totally 3 sub-districts.
In step 150 and 160, RNC can be by measuring control messages, the mode reporting measurement reports that order UE adopts reporting events or periodically reports.When adopting the mode of reporting events, the thresholding of RNC configuration signal intensity is as the trigger condition of reporting events, and UE only reports the result of " satisfying the high neighbor cell of signal strength signal intensity "; Give the correct time on adopting periodically, UE periodically reports all measurement results, and RNC finds out the higher sub-district of signal strength signal intensity according to measurement result again.
In Fig. 3, UE measures the signal strength signal intensity of sub-district A, B, C.The error redundancy that a permission is arranged when considering RNC calculating and estimating the UE shift position, the signal strength signal intensity of considering the sub-district that has in the neighbor cell list simultaneously is lower, the candidate cell of considering again may not need UE to admit owing to the load reason, so need to select a plurality of neighbor cells to measure and as candidate cell.
Have only the sub-district that allows this UE to admit just may become the Target cell of baton handover.For UE being received into top-quality sub-district, RNC forms a prioritised list that is used to admit control according to the signal strength signal intensity of candidate cell.By this order candidate cell being carried out acceptance judging then, stop acceptance judging behind the sub-district of finding a permission to admit, is Target cell with this candidate cell; After perhaps also can finding the candidate cell of a plurality of permissions admittances, therefrom select one again as Target cell.
From top flow process as can be seen, the essential condition that the present embodiment RNC that points out among Fig. 2 carries out baton handover comprises following four:
Baton handover condition 1, the signal quality of current service cell or intensity decreases also are lower than threshold value;
Baton handover condition 2, RNC can obtain the accurate location information of UE;
Baton handover condition 3, the signal strength signal intensity of the adjacent cell relevant with the UE position is higher, promptly has the high candidate cell of signal strength signal intensity;
Baton handover condition 4, candidate cell allow this UE to admit.
Correspondingly, and must satisfy 3 primary conditions as the Target cell of baton handover: 1) coverage of this Target cell is relevant with UE distance and direction; 2) the Target cell signal strength signal intensity is enough high; 3) Target cell allows this UE to admit.
Second embodiment
The difference of the flow process of present embodiment and first embodiment is following 2 points:
The first, the mode that present embodiment RNC obtains this UE positional information is to obtain (generally being stored in the database relevant with positioning service) from the positional information of this UE that has stored, rather than the location survey by initiation UE.
The second, the mode of the sub-district that RNC selection signal strength signal intensity is higher is to obtain from the measurement report of the relevant neighbor cell of storage, rather than by indication UE relevant neighbor cell is measured.
Other processing mode all is identical.
Claims (10)
1, a kind of implementation method of relay switchover judging process may further comprise the steps:
(a) radio network controller judges whether the signal quality of portable terminal current service cell or intensity descend and be lower than threshold value, if carry out next step, otherwise do not carry out baton handover;
(b) radio network controller positions this portable terminal, if can access the positional information of this portable terminal, carries out next step, otherwise does not carry out baton handover;
(c) radio network controller is determined the neighbor cell relevant with this mobile terminal locations according to the positional information of this portable terminal;
(d) radio network controller is selected the higher sub-district of several signal strength signal intensities from described relevant neighbor cell, as the candidate cell that is used for baton handover;
(e) radio network controller carries out acceptance judging to described candidate cell successively, and selects a Target cell that allows the candidate cell of admittance as this relay mobile terminal switching, the implementation of beginning baton handover.
2, implementation method as claimed in claim 1 is characterized in that, when described step (b) radio network controller is located this portable terminal, is the location survey of initiating this portable terminal; Perhaps radio network controller is to obtain from the positional information of this portable terminal of having stored.
3, implementation method as claimed in claim 1 or 2, it is characterized in that, described step (d) radio network controller is by measuring control messages, indicate this portable terminal to measure the signal strength signal intensity of described relevant neighbor cell, and obtain the higher sub-district of several signal strength signal intensities as described candidate cell according to the measurement report of this portable terminal; Perhaps radio network controller is to select the higher sub-district of several signal strength signal intensities as described candidate cell from the measurement report of relevant neighbor cell of storage.
4, implementation method as claimed in claim 1, it is characterized in that, described step (c) radio network controller is to predict the zone that it may move to according to the current location of this portable terminal, and coverage is comprised the relevant neighbor cell of this regional neighbor cell as this portable terminal.
5, implementation method as claimed in claim 4, it is characterized in that, when described step (b) radio network controller is located this portable terminal, if allow switching time, then initiate repeatedly location survey to this portable terminal, and calculate the translational speed and the moving direction of this portable terminal according to measurement result repeatedly, determine the zone that this portable terminal may move to position, translational speed, moving direction and the switching time of in step (c), taking all factors into consideration this portable terminal.
6, implementation method as claimed in claim 1 is characterized in that, the threshold value in the described step (a) is meant the good thresholding of portable terminal quality of signals.
As claim 1 or 6 described implementation methods, it is characterized in that 7, the threshold value in the described step (a) is meant the good thresholding of the intensity of portable terminal signal.
8, implementation method as claimed in claim 1, it is characterized in that, radio network controller is to carry out acceptance judging successively according to the order of described candidate cell signal strength signal intensity in the described step (e), finds behind the candidate cell that can admit with the Target cell of this sub-district as baton handover.
9, implementation method as claimed in claim 3, it is characterized in that, when described radio network controller moves this portable terminal and measures the signal strength signal intensity of described relevant neighbor cell by measuring the control messages indication, specify the mode reporting measurement reports of this portable terminal employing reporting events, and the thresholding of configuration signal intensity is as the trigger condition of reporting events.
10, implementation method as claimed in claim 3, it is characterized in that, when described radio network controller moves this portable terminal and measures the signal strength signal intensity of described relevant neighbor cell by measuring the control messages indication, specify this portable terminal to adopt the mode reporting measurement reports that periodically reports, radio network controller is found out the higher sub-district of signal strength signal intensity according to the measurement result that reports again.
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| WO2008113211A1 (en) * | 2007-03-20 | 2008-09-25 | Huawei Technologies Co., Ltd. | Method and system for determining a set of target cells suitable for handover form a source cell in a cellular communication system |
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