CN1731883A - Switch adjudgement method in TD-SCDMA system - Google Patents
Switch adjudgement method in TD-SCDMA system Download PDFInfo
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Abstract
This invention discloses a judging-switch method in TD-SCDMA system, using the reported result of UE event trigger to decide whether does switch, which comprises the following steps: 1, initializing the inward switch measure state into between frequency switch measure state, RNC sending measurement control order to UE; 2, if RNC judging the reported event as all between-frequency adjacent areas meeting 2E, switch to in-frequency switch state, turning to step 4, or to step 3; 3, if RNC judging the reported event as 2A/2B, turning to 5, or to 4; 4, if RNC judging as 1G, switch in frequency, turning to step 5, if judging as 2C or 2D, to 1; 5,receiving, controlling and distributing related source in corresponding aim area, if UE receives successfully, RNC sends switch order to UE, executing the new area turning to step 1, if not, executing the present area turning to step 1.
Description
Technical field
The present invention relates to the decision method of a kind of switching in TD-SCDMA (the Time Divsion-Synchronous Code DivisionMultiple Access time-division one, the synchronous code division multiple access inserted) system, refer more particularly to and in the TD-SCDMA system, utilize UE (User Equipment, subscriber equipment) reported result of Event triggered, thus whether decision is necessary to switch.
Background technology
In cellular radio Communication system, the overlay area of a radio communication is made up of many overlapping sub-districts.When a mobile subscriber was mobile in this zone, the mobile subscriber of often taking place to be in connection status with the sub-district switched to the situation of another sub-district from a sub-district.
In 3-G (Generation Three mobile communication system), do not have soft handover in the TD-SCDMA standard, and direct-cut operation is divided into direct-cut operation between frequently interior direct-cut operation and frequency.According to the characteristics of TD-SCDMA, because its frequency spectrum occupied bandwidth is narrow, so the easier different frequency that is equipped to of neighbor cell, the interference that this will help eliminating the minizone helps carrying out allocation of radio resources and management.Therefore direct-cut operation can make full use of the TD-SCDMA frequency resource between using frequently.
Before implementing direct-cut operation, need carry out comprehensive assessment to the signal quality of each different carrier frequency, when condition is suitable, in time UE is switched to top-quality carrier frequency, promptly implement direct-cut operation between frequency.Because direct-cut operation might cause call drop, therefore in handover scheme, the risk that reduces call drop is the content that needs emphasis to consider.
Direct-cut operation could obtain best performance of handoffs between which kind of mode realizing frequently by, promptly can reduce risk of dropped calls again when strengthening the UE communication quality, and this is extremely important for the performance that guarantees whole system.The present invention adopts Event triggered mode, head it off preferably.
The Chinese patent that disclosed publication number was CN1474527 on February 11st, 2004 discloses a kind of subscriber equipment Event triggered of utilizing and has reported mode to control the method for direct-cut operation between frequency in broadband CDMA system, this patent is primarily aimed at that direct-cut operation has proposed to use the incident trigger method between frequency in the WCDMA system, the incident 2A that provides with agreement 3GPP TS 25.331,2D, 2F is configured and makes up, for direct-cut operation between the WCDMA frequency provides the judgement foundation.Direct-cut operation between this patent can realize frequently, but only use this absolute threshold event of 2A, and 2A, the combination of 2D and 2F is difficult to guarantee the absolute mass of Target cell, causes frequent switching easily, increases the possibility of call drop, this is an one; Its two, switch in this patent is not supported frequently, when only there is a small amount of frequency in system, can cause like this switch difficult.
In March 27 calendar year 2001 disclosed publication number be of the switching of the United States Patent (USP) of US6208631B1 at CDMA mobile communication system, the method that adopts estimated distance to combine with base station pilot intensity has been proposed, by the pilot signal strength that UE receives and the threshold value of UE and base station distance are set, the pilot measurement result and the threshold value comparative result that utilize UE periodically to report, the UE that estimates and the distance of base station obtain switch decision.This patent adopts UE periodic report measurement result, can cause too much interacting message between UE and the RNC (Raido Network Controller, radio network controller), increases the treating capacity of RNC, is unfavorable for improving the capacity of whole system.
Summary of the invention
The technical problem to be solved in the present invention is to provide switch determining method in a kind of TD-SCDMA system, can improve the utilance of success rate for switching and power system capacity.
Be to realize the technical problem to be solved in the present invention, switch determining method comprises in a kind of TD-SCDMA of the present invention system:
Step (1) initialization enters the handover measurement state and is handover measurement state between frequency, and RNC sends measurement control order to UE, and this order comprises incident and the parameter thereof that requirement UE reports;
Step (2) if RNC judges reported event is: do not use the signal quality assessment of carrier frequency to be lower than certain threshold value, and all measure sub-districts and all satisfy this incident, be transformed into frequently in the handover measurement state, forward step (4) to, otherwise, forward step (3) to;
Step (3) if RNC judges the incident report is: the current signal quality that does not use carrier frequency is higher than the signal quality of current carrier frequency, or the estimated quality of the current frequency estimated quality that is lower than certain value and current not frequency of utilization is when being higher than certain threshold value, switch decision between making frequently, forward step (5) to, otherwise, forward step (4) to;
Step (4) if RNC judges the incident that reports is: best frequently interior cell change, switch decision in making frequently, forward step (5) to, if RNC judges the incident that reports be: the signal quality that does not use the carrier frequency quality to be higher than certain threshold value or current carrier frequency is lower than certain threshold value, forwards step (1) to;
Step (5) is done to admit control and is distributed respective resources at corresponding Target cell, if subscriber equipment is admitted successfully, send switching command by RNC to UE, upgrade measurement parameter, new sub-district is forwarded to step (1) continues to carry out, if admit failure, then current service cell is continued to forward to step (1) and carry out.
Method logic of the present invention is reasonable, efficient is high, can guarantee well that the TD-SCDMA system improves the signal quality of telex network in the mode of optimum, reduces the transmitting power of UE, and to the interference of other sub-districts; The method of the invention can also reduce the probability that the call drop phenomenon takes place, and improves the utilance of success rate for switching and power system capacity.Be mainly reflected in three aspects: be by rational sluggish coefficient on the one hand, frequent switching is effectively avoided in the introducing in threshold value and triggered time.Because direct-cut operation each time all has the risk of call drop, can switch the number of times minimizing call drop phenomenon that takes place by reducing.They are two years old, incident 2B and 2A both can use separately, can be used again, come to determine the Target cell of " being worth switching " as required, if it is, might make UE obtain better communication quality so really, but also may be former thereby increase and switch repeatedly and the possibility of call drop because of parameter selection etc. under any circumstance as long as incident 2A takes place to switch, in case the call drop phenomenon takes place, will greatly influence service quality.After introducing 2B, then can avoid occurring the possibility of above-mentioned situation.And the preferential judgement of 2E has realized switching preferential thought between frequency that the present invention adopts, promptly has only when not using carrier frequency all relatively poor, just consider frequently in switching.In fact, be more suitable for for the more rich relatively TD-SCDMA of frequency resource system like this.The 3rd, in case UE needs to switch really, this moment RRM (Radio Resource Manager, RRM) can support UE between frequency in the direct-cut operation, obtain a plurality of candidate cells, even Target cell is arranged, can obtain other Target cells in the same old way, thereby reduce contingent switching call drop phenomenon owing to reasons such as admittance can't be switched.In addition,, reduced the message traffic between RNC and the UE, improved the disposal ability of RNC, thereby also improved the capacity of whole system owing to adopt Event triggered.
Description of drawings
The state transition diagram of Fig. 1 for switching;
Fig. 2 is a switching controls flow chart of the present invention.
Embodiment
The present invention makes full use of the measurement result that the UE Event triggered reports in the TD-SCDMA system, in RNC, incident and measurement result that UE reported are controlled fully and adjudicated, thereby whether decision is necessary to switch.
In 3GPP TS 25.331 standards, the measurement report of having stipulated UE in the TD-SCDMA system reports can select dual mode: periodic report and Event triggered report.The precondition that the method for the invention is used is in measurement control order, uses Event triggered to report scheme.The present invention supports UE place geographic cell to have overloading to cover frequently in addition.
In 3GPP TS 25.331, as follows to Event Description mentioned among the present invention:
(1) incident 2A: optimum carrier frequency changes, and the promptly current signal quality that does not use carrier frequency is higher than the signal quality of current carrier frequency.
(2) incident 2B: the estimated quality that the estimated quality of current carrier frequency is lower than certain threshold value and current not frequency of utilization is higher than certain threshold value.
(3) incident 2C: do not use the carrier frequency quality to be higher than certain threshold value.
(4) incident 2D: the signal quality of current carrier frequency is lower than certain threshold value.
(5) incident 2E: do not use the signal quality assessment of carrier frequency to be lower than certain threshold value.
(6) incident 1G: best frequently interior cell change.
Event triggered proposed by the invention reports the hard handoff decision method, may further comprise the steps:
Step (1) initialization enters the handover measurement state and is handover measurement state between frequency, and RNC sends measurement control order to UE, and this order comprises incident and the parameter thereof that requirement UE reports;
Step (2) is if it is 2E that RNC judges reported event, and all measure sub-districts and all satisfy this incident, be transformed into frequently in the handover measurement state, forward step (4) to, otherwise, forward step (3) to;
Step (3) is made switch decision between frequency if RNC judges that reported event is 2A/2B, forwards step (5) to, otherwise, forward step (4) to;
Step (4) is made frequently interior switch decision if RNC judges that reported event is 1G, forwards step (5) to, if RNC judges that reported event is 2C or 2D, forwards step (1) to;
Step (5) is done to admit control and is distributed respective resources at corresponding Target cell, if UE admits successfully, sends switching command by RNC to UE, upgrade measurement parameter, new sub-district is forwarded to step (1) continue to carry out,, then current service cell is continued to forward to step (1) and carry out if admit failure.
Wherein UE receives the control command that RNC sent, and measures according to concrete measurement requirement; Reporting measurement result when the trigger condition of requirement incident satisfies.Comprehensive quality at a certain carrier frequency of UE end assessment adopts following formula:
Q
i，frequency?j＝10·LogM?
i，frequency?j+O
i，j
Q in the formula
IfrequencyjBe that the quality of cell i on frequency j estimated;
M
I.frequencyjIt is the measurement result of cell i received signal code power (RSCP) of main Common Control Physical Channel (P-CCPCH) on frequency j;
Q
I, jBe the sub-district individual character side-play amount of cell i on frequency j.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
Introduce the different state of flag bit sign handover module in order to illustrate with the convenience of handling in handover module, different measurements that state carried out and the switching that may carry out are inequality, its state transition graph such as accompanying drawing 1.There are two states in this state transition diagram: handover measurement state between handover measurement state and frequency frequently.Frequently the feature of handover measurement state is to open affair (2A/2B and 2E) between frequency between; The feature of handover measurement state is an affair (1G) in opening frequently in the frequency, monitors this carrier frequency and the quality (2C and 2D) of not using carrier frequency simultaneously.When 2E is satisfied in all measurement sub-districts, handover measurement in state turns to frequently by handover measurement between frequency; When UE reports 2C or 2D, handover measurement between state turns to frequently by frequently interior handover measurement.
In the TD-SCDMA system, use the method for the invention, at first will satisfy geographic area, UE place and have the alien frequencies adjacent area, otherwise the generation of direct-cut operation between can not having frequently; Secondly in measurement control order, need to use Event triggered to report scheme.And UE just can use this method being under the CELL_DCH state, and (CELL_DCH is one of RRC state, and when being in this state, UE is assigned with DPCH, and SRNC can know sub-district, UE place.UE measures simultaneously, and according to the measuring control information transmission measurement report that receives from RNC), when being in other RRC states such as CELL_PCH, URA_PCH, CELL_FACH state at UE, because there is not DPCH in UE, switch the sub-district that UE will can not take place to cause because of link-quality, generally can not use.But this method still is not precluded within being suitable under other states.
The flow process of the method for the invention core concept as shown in Figure 2, from accompanying drawing 2 as can be seen:
(1) after entering the CELL_PCH state, the handover measurement state exchange counter of RRM (following abbreviation counter) zero clearing, RNC sends measurement control order to UE, specify the physical quantity that UE need measure, the physical quantity that reports, the filtration coefficient (being used for carrying out at UE the filtration of measured value) of measurement, the cell information of measuring, the measurement report mode is set at that Event triggered reports mode, the reporting at interval etc. and switch relevant parameter of the quantity of the measurement report that reports, measurement report.Its objective is to allow UE measure according to the concrete needs that RNC provides, wherein providing of some information can make things convenient for UE to measure fast.
(2) UE is after receiving measurement control (MEASUREMENT CONTROL) information, according to the specific requirement in the order, begin to measure, and utilize the filtration coefficient of giving in the measurement control order that measurement result is filtered, each CF signal of measuring is carried out comprehensive assessment, when the condition of requirement reported event satisfies, measurement result is uploaded to RNC with measurement report (MEASUREMENT REPORT) message.Its objective is that UE reporting measurement result makes RNC carry out next step measurement when control and during the judgement of whether switching, sufficient reference frame arranged.
(3) the concrete incident that reports according to UE is adjudicated respectively and is controlled.When UE reports 2A/2B, show that to have quality better, and be better than the alien-frequency district of current carrier frequency, switch between will triggering frequently.If only utilize the relative threshold incident to judge (2A) in some cases, can not guarantee well that switching target small area is suitable, and only adjudicate with absolute thresholding, can not guarantee that again Serving cell is always the principle of optimum subdistrict.The mode that can adopt 2A and 2B to combine and consider at this time can be more conducive to guarantee the achievement of switching like this.If do not meet the Target cell (as by punishment timer mark) of switching condition in the sub-district of coincident event, and counter is then still made switch decision greater than 2, otherwise the handover measurement state (is initiated 1G and 2C in will forwarding to frequently, the 2D affair), seek internal object sub-district frequently.Unison counter adds 1.
(4) in the UE measurement report, all alien-frequency districts all satisfy 2E, this means that the quality of all alien frequencies adjacent areas is all relatively poor, switch between uncomfortable cooperation frequently, and need open the measurement of frequently interior 1G incident this moment, and the measurement of opening 2C and 2D incident.The purpose of initiating the 1G affair is in order to seek Target cell in the sub-district in frequently, if find, will trigger frequently interior switch decision.
(5) in case UE reports 2D, (suitable threshold value can be set, make 2D and 1G mutual exclusion) means that so current use carrier frequency is relatively poor, will get back to handover measurement state between frequency, opens inter-frequency measurement 2A/2B and 2E.In like manner, if UE reports 2C, show appearance preferably frequently between the adjacent area, also will return frequently between handover measurement state and open inter-frequency measurement 2A/2B and 2E.
(6) like this, in 1G is reported, and will trigger frequently, switch, make frequently interior switch decision.If do not meet the Target cell (as not opened) of switching condition in the 1G sub-district that reports, will get back to handover measurement state between frequency, Target cell between searching frequently by punishment timer mark or permission diverter switch.(initiating 2A/2B and 2E measures), unison counter adds 1.
(7) judge have incident 2A/2B or 1G to take place when, need to do to switch needed further action, promptly in the sub-district of corresponding carrier frequency, do to admit control and sign indicating number resource allocation, can be admitted and the assigned code resource if (have a plurality of) in the sub-district that meets switching condition, then these sub-districts are decided to be Target cell, prepare to carry out direct-cut operation, and the measurement of carrying out incident 2A/2B and incident 2E in new carrier frequency reports.Switching may be carried out by following several command messagess: (a) RB set up process (RADIO BEARERSETUP) (b) the RB reconfiguration course (RADIO BEARER RECONFIGURATION (c) RB dispose procedure (RADIO BEARER RELEASE) (d) transmission channel reshuffle (TRANSPORTCHANNEL RECONFIGURATION) (e) physical channel reshuffle (PHYSICALCHANNEL RECONFIGURATION).The back counter O reset runs succeeded.If do not admitted (can not be assigned with a yard resource certainly) at alien-frequency district yet, or because abnormal conditions are switched the execution failure, change action between then this time not carrying out frequently, counter O reset order UE begin former sub-district is carried out the judgement of incident 2E and incident 2A/2B and reported.
The inventive method is from theoretical and realize that two aspects are that the decision method that switches between the preferential frequency of TD-SCDMA system has been done clear and definite explanation.Have following advantage: (1) this method logic is reasonable, efficient is high, can guarantee between the desired frequency of TD-SCDMA system well and the realization of switching frequently, can as much as possible improve the signal quality of telex network, reduce the transmitting power of UE, can reduce interference other sub-districts.(2) the preferential judgement of rational sluggish coefficient introducing and 2E, 2B incident, it is abundant relatively to make full use of the TD-SCDMA frequency resource, realizes switching preferential strategy between frequency, and then alleviates co-channel interference, avoid frequent switching simultaneously, reduce the risk that call drop takes place.(3) this method adopts the mode that Event triggered reports, and can avoid interacting message too much between UE and the RNC, has significantly reduced the treating capacity of RNC, thereby has helped to improve the capacity of whole system.
Claims (9)
1, the switch determining method in a kind of TD-SCDMA system is characterized in that, may further comprise the steps:
Step (1) initialization enters the handover measurement state and is handover measurement state between frequency, and radio network controller sends measurement control order to subscriber equipment, and this order comprises the incident and the parameter thereof of requirement user equipment to report;
Step (2) if radio network controller is judged the incident report is: currently do not use the signal quality assessment of carrier frequency to be lower than certain threshold value, and all are measured the sub-district and all satisfy this incident, are transformed into frequently interior handover measurement state, forward step (4) to, otherwise, forward step (3) to;
Step (3) if radio network controller is judged the incident report is: the current signal quality that does not use carrier frequency is higher than the signal quality of current carrier frequency, or the estimated quality of the current frequency estimated quality that is lower than certain value and current not frequency of utilization is when being higher than certain threshold value, switch decision between making frequently, forward step (5) to, otherwise, forward step (4) to;
Step (4) if radio network controller is judged the incident that reports is: best frequently interior cell change, switch decision in making frequently, forward step (5) to, if radio network controller is judged the incident that reports and is: the current signal quality that does not use the carrier frequency quality to be higher than certain threshold value or current carrier frequency is lower than certain threshold value, forwards step (1) to;
Step (5) is done to admit control and is distributed respective resources at corresponding Target cell, if subscriber equipment is admitted successfully, send switching command by radio network controller to subscriber equipment, upgrade measurement parameter, new sub-district is forwarded to step (1) continues to carry out, if admit failure, then current service cell is continued to forward to step (1) and carry out.
2, method according to claim 1, it is characterized in that: the handover measurement state is to send measurement control order with affair between opening frequently by radio network controller to subscriber equipment between the frequency described in the step (1), frequently incident comprises between: have the current signal quality that does not use carrier frequency to be higher than the signal quality of current carrier frequency, or at present the estimated quality of frequency of utilization be lower than certain value and at present not the estimated quality of frequency of utilization be higher than certain threshold value, do not use the signal quality assessment of carrier frequency to be lower than certain threshold value.
3, method according to claim 1, it is characterized in that: the handover measurement state is to send measurement control order to open affair in the frequency by radio network controller to subscriber equipment in the frequency described in the step (2), and incident comprises in the frequency: best frequently interior cell change, the signal quality that does not use the carrier frequency quality to be higher than certain threshold value, current carrier frequency are lower than certain threshold value.
4, method according to claim 1 is characterized in that: parameter described in the step (1) comprises the reporting at interval of quantity, measurement report of the cell information of filtration coefficient, the measurement of the physical quantity that reports, measurement, the measurement report that reports.
5, according to the described method of one of claim 1 to 4, it is characterized in that: described initialization comprises that the counter O reset of handover measurement state exchange, setting threshold value, setting measurement report manner are that Event triggered reports mode.
6, method according to claim 5, it is characterized in that: when between triggering frequently, switching, if do not meet the Target cell of switching condition in the sub-district of coincident event, and counter is greater than 2, then still make switch decision, otherwise handover measurement state in will forwarding to is frequently sought internal object sub-district frequently, and unison counter adds 1.
7, method according to claim 6, it is characterized in that: when in triggering frequently, switching,, will get back to handover measurement state between frequency if when not meeting the Target cell of switching condition in the sub-district of coincident event, Target cell between seeking frequently, unison counter adds 1.
8, method according to claim 7 is characterized in that: the command messages that carry out to switch comprises that radio bearer sets up that process, radio bearer reconfiguration process, radio bearer dispose procedure, transmission channel are reshuffled, physical channel is reshuffled.
9, method according to claim 8 is characterized in that: the comprehensive quality at a certain carrier frequency of UE end assessment adopts formula: Q
I, frequency j=10LogM
I, frequency j+ O
I, j
Q in the formula
I, frequency jBe that the quality of cell i on frequency j estimated;
M
I, frequency jIt is the measurement result of cell i received signal code power of main Common Control Physical Channel on frequency j;
O
I, jBe the sub-district individual character side-play amount of cell i on frequency j.
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| CN101686472A (en) * | 2008-09-28 | 2010-03-31 | 华为技术有限公司 | Method and device for reporting measurement |
| CN101064920B (en) * | 2006-04-28 | 2010-05-12 | 中兴通讯股份有限公司 | Method for realizing cross-zone handoff in TD-SCDMA multi-frequency point cell |
| CN101064943B (en) * | 2006-04-30 | 2010-05-12 | 中兴通讯股份有限公司 | Method for switching uplink random channel or sharing channel between mobile communication systems |
| CN101170818B (en) * | 2007-03-12 | 2010-06-16 | 中兴通讯股份有限公司 | Method and system for terminal to switch from TDCDMA to other networks |
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| CN102264081A (en) * | 2010-05-24 | 2011-11-30 | 鼎桥通信技术有限公司 | Additional measuring method |
| CN101772066B (en) * | 2009-01-05 | 2012-05-30 | 鼎桥通信技术有限公司 | Control method for periodic measurement |
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| CN101257708B (en) * | 2007-02-27 | 2011-01-19 | 中兴通讯股份有限公司 | Method and system for realizing terminal basic switch from TDCDMA to GSM |
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| CN101094528B (en) * | 2007-03-12 | 2010-09-29 | 中兴通讯股份有限公司 | Method for terminal to cancel switching from TDCDMA to other network |
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| CN102195700A (en) * | 2011-06-10 | 2011-09-21 | 西安交通大学 | Scheduling transmission method for collaborative cells against cell edge users of downlink |
| CN103379573A (en) * | 2012-04-16 | 2013-10-30 | 马维尔国际有限公司 | Method and device for cell switching |
| CN103379573B (en) * | 2012-04-16 | 2019-01-01 | 马维尔国际有限公司 | Method and apparatus for cell switching |
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