CN1426184A - Decision method for periodic report and channel interval hard switching - Google Patents

Abstract

The present invention proposes a judging method for periodic reporting of inter-frequency hard handover, including: 1. RNC sends a measurement control command to UE; 2. UE receives the RNC control command and measures it; reports the measurement result; 3. RNC stores the measurement value reported by UE , evaluate the signal quality of each carrier frequency; 4. Judgment whether event 2F is satisfied: if satisfied, go to 10; 5. Judgment whether event 2A is satisfied: if satisfied, go to 6; 6. RNC performs admission control and resource allocation; 7. Judging whether all All target cells can accept and allocate resources; if it is satisfied, go to 9; 8. According to the acceptable cell, judge whether event 2A is satisfied again; if not, go to 10; 9. Send a handover command to the UE and end; 10. Do not handover. The method of the invention has reasonable logic and high efficiency, can well ensure inter-frequency switching required by the WCDMA system, improves signal quality in an optimal manner, reduces UE transmission power, and interferes with other cells. The method of the invention can also reduce the probability of dropped calls.

Description

Judgment method for periodical reporting inter-frequency hard handover

technical field

The present invention relates to a WCDMA (Wideband Code Division Multiple Access, wideband code division multiple access) system, in particular, relates to a control method for inter-frequency hard handover in the WCDMA system.

Background technique

As the mobile communication system is more and more widely used, many key technologies in the system are becoming more and more perfect, but there are still some problems to be solved, and cell handover is one of the main problems. In a cellular wireless communication system, a wireless communication coverage area consists of many partially overlapping cells. When a mobile user moves in this area, it often happens that the mobile user connected to the cell is handed over from one cell to another. In the first and second generation cellular mobile communication systems, the frequency used by a designated cell cannot be used by other adjacent cells, that is, there must be a spatial interval between cells using the same frequency to form a frequency reuse. Therefore, the handover of mobile users between cells is mainly performed between channels of different frequencies. At this time, the handover will cause the voice transmission to be interrupted for a period of time, resulting in communication interruption, which is called hard handover.

With the emergence of the third-generation mobile communication system, the advantages of soft handover technology as a WCDMA system have gradually been applied, that is, when a mobile station establishes contact with a new cell during its movement, it does not immediately interrupt the connection with the original cell. The soft switching implemented in the carrier frequency can greatly reduce the call drop rate. Since the frequency reuse factor in the third-generation system can reach 1, adjacent cells can use the same frequency, which makes it possible for UE (User Equipment, user equipment) to perform soft handover between different cells, thereby improving the overall The communication quality of the system.

Similar to the GSM system, the WCDMA system may use multiple carrier frequencies in some hot spots where users are densely populated to increase system capacity, thereby forming multi-layer coverage. At this time, when a UE is moving, due to changes in the surrounding environment or current use The increase in the number of users in the carrier frequency may lead to the deterioration of the UE's communication quality. Only through intra-frequency soft handover may not be able to meet the UE's communication quality requirements. In areas covered by multiple carrier frequencies, it is necessary to consider using frequency Hard handoff between them for better communication quality. Before implementing hard handover, it is necessary to comprehensively evaluate the signal quality of different carrier frequencies. When the conditions are suitable, the UE is handed over to the carrier frequency with the best quality in time, that is, inter-frequency hard handover is implemented. Since hard handover may lead to call drop, reducing the risk of call drop is an important consideration in the handover solution.

Compared with other systems (such as GSM system and CDMA system), WCDMA system has many special features of its own. Because of its relatively short development time in various countries, there is not much information on the specific implementation of handover. , Among the published patents, there is no patent on inter-frequency hard handover for reference and comparison. Adopting different implementation methods of inter-frequency hard handover has relatively great impact on the system. First, the realization of many basic functions of the system requires hard switching between frequencies. No matter what the specific solution is, realizing the inter-frequency hard handover function is the most basic function. In the existing WCDMA system, each equipment provider does not have a practical solution; secondly, how to realize inter-frequency hard handover Handover can achieve the best handover performance, that is, it can reduce the risk of call drop while enhancing the UE communication quality, which is extremely important to ensure the performance of the entire system.

Contents of the invention

The purpose of the present invention is to solve the problem that there is no feasible decision control method for inter-frequency hard handover in the prior art, and the hard handover requirements stipulated in the WCDMA standard cannot be technically realized, and a method for periodically reporting inter-frequency hard handover judgment is proposed .

In the 3GPP TS 25.331 specification, it is stipulated that in the WCDMA system, UE's measurement report can be reported in two ways: periodic reporting and event-triggered reporting. This method is mainly proposed for the periodic reporting method. In this method, make full use of the events defined in the 3GPP TS 25.331 specification, and use them in a selective and reasonable combination. On the one hand, try to avoid frequent and unnecessary inter-frequency handovers, and on the other hand, let UE Try to obtain as many link supports as possible to reduce the risk of call drop.

The use of the method of the present invention includes two preconditions: (1) the geographical cell where the UE is located has multiple carrier frequency coverage, otherwise there will be no inter-frequency hard handover; (2) in the measurement control command, the periodic reporting scheme is used .

According to 3GPP TS 25.331, the event mentioned in the present invention is described as follows:

(1) Event 2A: The optimal carrier frequency changes, that is, the signal quality of a non-current carrier frequency is higher than that of the current carrier frequency.

(2) Event 2D: The signal quality of the current carrier frequency is lower than a certain threshold value.

(3) Event 2E: The signal quality of a certain non-current carrier frequency is lower than a certain threshold value.

(4) Event 2F: The signal quality evaluation of the current carrier frequency is higher than a threshold value.

The periodical reporting inter-frequency hard handoff judgment method proposed by the present invention comprises the following steps:

In the first step, the RNC (Radio Network Controller, radio network controller) needs to send a measurement control command (MEASUREMENTCONTROL) to the UE according to the information of the cell where the UE is located and its neighbors; When multiple carrier frequencies are covered, the UE is required to perform inter-frequency measurement;

Step 2, UE receives the control command issued by RNC, and performs measurement according to the specific measurement requirements; reports the measurement results in the reporting period slot;

In step 3, after the RNC receives the reported results, it stores the measured values of the pilot signals of each carrier frequency and each cell reported by the UE; according to the saved measurement results, evaluate the signal quality of each carrier frequency according to the following method: $Q_{\mathrm{carrierj}}=10\·\log m_{\mathrm{carrierj}}=W_j\&Center\; Dot;10\&Center\; Dot;\log \left(\underset{i=1}{\overset{N_{\mathrm{Aj}}}{\mathrm{\Σ}}}{m}_{\mathrm{ij}}\right)+(1-W_j)\&Center\; Dot;10\&Center\; Dot;\log m_{\mathrm{Bestj}}-h,$

Q _carrierj is the quality value (dB) of a certain carrier frequency j; M _carrierj is the estimated quality of a certain carrier frequency;

M _ij is the measured value of the pilot signals of all active set cells of carrier frequency j;

N _Aj is the number of cells in the active set of carrier frequency j;

M _Bestj is the best cell measurement value in carrier frequency j;

W _j is the weight coefficient in carrier frequency j;

H is the hysteresis parameter;

Q _frequencyj is the comprehensive evaluation value of signal quality of carrier frequency j;

Step 4, RNC judges whether event 2F is satisfied: if event 2F is satisfied, go to step 10;

Step 5, RNC judges whether event 2A is satisfied: if event 2A is satisfied, go to step 6;

In step 6, the RNC performs admission control and allocation of resources to the virtual active set cells in the carrier frequency to be handed over, and reports the results of whether to admit and whether the resources can be allocated to the handover module in the RNC;

Step 7, RNC judges whether all target cells can accept and allocate resources; if satisfied, then turn to step 9;

Step 8, RNC judges again whether event 2A is satisfied according to the acceptable cell; if not, go to step 10;

Step 9, after confirming the handover, the RNC sends a handover command to the UE, and ends; Step 10, does not handover, ends.

An 11th step is also included between step 4 and step 5: after judging that the measurement result does not satisfy event 2F, then judge whether event 2D is satisfied;

Between step 3 and step 4, there is another parallel decision branch, which includes step 12, step 12.1 and step 12.2. Step 12: Make a decision on event 2E to see if The signal quality of a carrier frequency is lower than a fixed threshold value; if there is no such carrier frequency, go to step 12.2; step 12.1: remove this carrier frequency in the measurement control message, and no longer monitor this carrier frequency, The measurement control command needs to be sent to the UE again; Step 12.2: The carrier frequency is monitored as usual.

The information about the cell where the UE is located and the neighboring cells mentioned in step 1 includes the cell's primary scrambling code, cell ID, primary CPICH power, Tx diversity ID, and frequency information. The measurement control command (MEASUREMENT CONTROL) sent by the RNC to the UE includes the measurement filter coefficient for the UE, the cells to be measured, the reporting cycle, the number of reports, and the CPICH information of each measurement cell, the amount of information such as the amount of measurement, the amount of report, etc. measurement, and at the same time set the reporting mode of the UE to periodic reporting.

The quantity measured by the UE in step 2 is the pilot signal quality or strength of each cell required for handover.

If M _ij mentioned in step 3 is a non-working carrier frequency, each cell of each carrier frequency is a virtual active set cell. The said N _Aj is generally not more than 4. The M _Bestj is reported from UE measurement. The value of W _j is between 0.3 and 0.8. The value of H mentioned above is between 1.5dB and 3dB.

The method described in the present invention has reasonable logic and high efficiency, can well ensure the effective realization of the inter-frequency handover required by the WCDMA system, and can improve the signal quality of user communication in an optimal manner, reduce the transmit power of the UE, and Interference with other cells. In addition, the method of the present invention can also reduce the probability of dropped calls from two aspects: on the one hand, through the introduction of reasonable hysteresis coefficients and the priority judgment of event 2F, frequent switching can be avoided, because each frequency There is a risk of call drop in hard handover, and you can reduce call drop by reducing the number of times handover occurs. If in any case, handover occurs as long as event 2A occurs, it is indeed possible for UE to obtain better communication quality, but it also increases the possibility of call drop. Once call drop occurs, it will greatly affect service quality . In fact, when the condition of event 2F is satisfied, it should be considered that the communication quality of the UE is already very good, and there is no need to risk call drop for inter-frequency hard handover operation; on the other hand, once the UE really needs to handover, the system will It can support the UE to obtain the support of multiple links when the inter-frequency hard handover occurs. Even if one link is disconnected, other links can still provide communication services with a certain performance, thereby reducing possible handover call drops. . If, like in the GSM system, there is only one link to support each hard handover, then once this link is broken, it will be difficult to make up for it, which will greatly affect the service quality of the system.

Description of drawings

Fig. 1 is a flow chart of the periodic reporting inter-frequency hard handover control method according to the present invention;

FIG. 2 is a flow chart of a method for controlling periodic reporting of inter-frequency hard handover as an embodiment;

Fig. 3 is an overall flow chart of periodic reporting inter-frequency hard handover according to the present invention.

Fig. 4 is an example of periodic reporting inter-frequency handover decision.

Detailed ways

The invention makes full use of the measurement results periodically reported by the UE in the WCDMA system, and comprehensively evaluates the signal quality of each carrier frequency cell monitored by the UE in the RNC, so as to determine whether it is necessary to perform inter-frequency hard handover.

Below in conjunction with accompanying drawing, the implementation of technical scheme is described in further detail:

To apply the method of the present invention in a WCDMA system, firstly, the geographic cell where the UE is located must be covered by multiple carrier frequencies, otherwise hard inter-frequency handover will not occur; secondly, in the measurement control command, a periodic reporting scheme needs to be used. Moreover, this method can only be used when the UE is in the CELL_DCH state. When the UE is in other states such as CELL_PCH, URA_PCH, and CELL_FACH, since the UE does not have a dedicated channel, the UE will not undergo cell handover, and generally it will not be used. However, this method still does not exclude the application in other states.

The flow process of method core idea of the present invention is as shown in Figure 1, as can be seen from Figure 1:

(1) The RNC sends a measurement control command to the UE, specifying the physical quantity to be measured by the UE, the physical quantity to be reported, the filter coefficient of the measurement (for filtering the measured value in the UE), and the cell information to be measured. The measurement report method is set as Parameters related to handover, such as the periodic reporting method, the number of reported measurement reports, and the reporting interval of measurement reports. Its purpose is to allow the UE to perform measurements according to the specific needs given by the RNC, and the provision of some information can facilitate the rapid measurement of the UE.

(2) After receiving the measurement control (MEASUREMENT CONTROL) information, the UE starts to measure according to the specific requirements in the command, and uses the filter coefficient given in the measurement control command to filter the measurement results, and when the time for periodic reporting expires , use a measurement report (MEASUREMENTREPORT) message to upload the measurement result to the RNC. The purpose is that the measurement results reported by all UEs provide sufficient reference for the RNC to make a decision on whether to handover or not.

(3) The RNC stores measurement quantities (CPICH_Ec/No or CPICH_RSCP) for different UEs according to different carrier frequencies and different cells, and comprehensively evaluates the signal quality of cells under each carrier frequency for judgment. Under each carrier frequency, the cells can be maintained in three categories (virtual) active set, monitoring set, and detection set according to the measurement results of the cell signal.

(4) According to the result of the comprehensive evaluation of the signal quality of the carrier frequency, the decision of event 2F is made, that is, to observe whether the signal quality of the carrier frequency currently used by the UE is trustworthy. If event 2F is satisfied, inter-frequency handover is not considered at all. Even if there is a carrier frequency with better signal quality, the signal of the current carrier frequency is considered trustworthy, because hard handover may cause call drop. Call drop will greatly affect the business service quality. When the event 2F is satisfied, the risk of call drop that may occur due to inter-frequency hard handover is not considered. In addition, if event 2F is not satisfied, it indicates that the signal quality of the current carrier frequency is not very good, and further judgment is required. If it is found that there is a carrier frequency with better signal quality at this time, handover will be considered to improve service quality. service quality.

(5) When the event 2F is not satisfied, judge whether the event 2A is satisfied, that is, observe whether the signal quality of other carrier frequency is better than the signal quality of the current carrier frequency. If event 2A is satisfied, it indicates that the signal quality of other carrier frequencies is better than that of the current carrier frequency, and the possibility of handover can be further considered. If event 2A is not satisfied, it means that the signal quality of other carrier frequencies is better than the signal quality of the current carrier frequency at this time. The situation at this time is that although the signal quality of the current carrier frequency of the UE The signal quality of the carrier frequency is better, so it can only continue to use the current carrier frequency.

(6) Once the judgment shows that event 2A is satisfied, allocate resources in the virtual active set of different carrier frequencies to prepare for handover. Of course, not every cell in the virtual active set is capable of accepting the switched services and assigning resources. Therefore, once a cell cannot accept or perform resource allocation, a further decision must be made, because for those who cannot accept Even if the measured value of the pilot signal is very good, it should not be used for the comprehensive evaluation of the signal of this carrier frequency. Therefore, it is also necessary to look at the comprehensive signal quality of other virtual active set cells except the unacceptable cells. Evaluate whether the results can also satisfy Event 2A.

(7) After all the cells in the virtual active set in the carrier frequency meeting the event 2A can accept the service of the UE and give appropriate resource allocation, these cells are considered as the target cells to be handed over. After determining the target cell, the RNC sends a handover command to the UE. The command may be one of the following: (a) RB establishment process (RADIO BEARER SETUP) (b) RB reconfiguration process (RADIO BEARER RECONFIGURATION (c) RB release process (RADIO BEARER RELEASE) (d) transport channel reconfiguration ( TRANSPORT CHANNEL RECONFIGURATION) (e) physical channel reconfiguration (PHYSICAL CHANNEL RECONFIGURATION). Regardless of whether the final switch occurs or not, the (virtual) active set and monitoring set of the currently used carrier frequency and the non-used carrier frequency must be maintained respectively. You can see It is understood that if the number of admissible virtual active set cells with different frequencies is greater than 1, when handover is implemented, the handover UE can be supported on multiple links at the same time. The biggest advantage of this process is that it can greatly reduce the need for handover The phenomenon of possible call drop can also be improved to obtain higher communication quality at different carrier frequencies.

Fig. 2 is a method flow chart of an embodiment of the periodic reporting inter-frequency hard handover judgment method of the present invention, and this method adds several steps to the method shown in Fig. 1 . details as follows:

1. Add a step between step 4 and step 5, that is, step 11: After judging that the measurement result does not satisfy event 2F, then judge whether event 2D is satisfied. The purpose of this is to actively add a handover hysteresis factor. The quality of the current carrier frequency may not be particularly ideal (because event 2F is not satisfied), and the judgment of event 2D can be used to judge whether the signal of the current carrier frequency is so bad that it really needs to be considered. For handover, the signal quality of the current carrier frequency may be acceptable (that is, neither event 2F nor event 2D is satisfied), and handover is not considered at this time. Another purpose of using this event judgment is that another measurement control method can be introduced, that is, when the current carrier frequency signal quality is very good (that is, event 2F is satisfied), the compressed mode is not started for inter-frequency measurement, and only when the After event 2D, start the compression mode to measure the quality of inter-frequency signals, and consider the possibility of inter-frequency handover. In order to avoid frequently starting or stopping the compressed mode for inter-frequency measurement, the compressed mode is stopped for measurement after the event 2F is satisfied.

2. Add another parallel decision branch between step 3 and step 4, that is, step 12, step 12.1 and step 12.2: make a judgment on event 2E to see if there is a carrier frequency whose signal quality is lower than A fixed threshold. Below this threshold, it is impossible to guarantee a good effect, which is not allowed for communication. Once such a carrier frequency appears, the carrier frequency is removed from the measurement control message, and the carrier frequency is no longer monitored (step 12.1), and the measurement control command needs to be sent to the UE again. Of course, if this event is not satisfied, the carrier frequency is monitored as usual (step 12.2).

Fig. 3 is a flow chart of handover decision operation of the whole system including the method of the present invention. It can be seen that the judgment of inter-frequency handover is the basic flow of modules (A)→(B)→(C)→(D)→(E)→(G)→(I) in the general flow chart. In the whole system, besides the judgment of inter-frequency handover, there are intra-frequency soft handover judgments and inter-system handover judgments.

FIG. 4 is an embodiment of periodic reporting of inter-frequency handover. In the figure, the comprehensive evaluation quality of two carrier frequencies is represented by solid line 1 and dotted line 2 respectively. H _2F and H _2D are the absolute thresholds of event 2F and event 2D. H _2A is the relative threshold value between the comprehensive evaluation of two different carrier frequencies in event 2A.

(1) At the beginning, the UE works on carrier frequency 1. It can be seen from the figure that the signal quality of carrier frequency 1 is not as good as that of carrier frequency 2 in the part of time before time _t1 . The comprehensive evaluation of the signal quality of has not met the condition of event 2D, that is, the signal quality of the current carrier frequency 1 is not very bad and can still be used. If the judgment of event 2D is not carried out (such as: method 1 in the present invention), then the threshold H _2F and H _2D are combined into one, as long as the current carrier frequency evaluation quality is below the threshold H _2F , the event 2A is started judgment.

(2) At time _t1 , the signal quality of carrier frequency 1 drops below the H _2D threshold, and then it is judged to satisfy event 2D, that is, it starts to consider whether there are other carrier frequency signals better than the current carrier frequency. Similarly, if the adopted method does not judge the event 2D (such as: method 1 in the present invention), then the threshold H _2F and H _2D are combined into one, as long as the current carrier frequency evaluation quality is below the threshold H _2F , that is Judgment for Event 2A begins.

(3) At time _t2 , it is found that the comprehensive evaluation of the signal quality of carrier frequency 2 is better than the current carrier frequency 1 by a threshold value H _2A . At this time, after the UE reports the measurement result, the condition for the RNC to determine event 2A has been fulfilled. satisfy. That is, the inter-frequency handover is ready to occur, and the UE works on the new carrier frequency 2 after the inter-frequency handover.

(4) At time _t3 , the comprehensive evaluation result of the signal quality of carrier frequency 2 has reached the condition of event 2F, that is, the threshold H _2F . Consider switching happening.

(5) After time _t3 , although the comprehensive evaluation of the signal quality of carrier frequency 1 is better than that of carrier frequency 2, because the signal quality of UE's current working carrier frequency 2 is good, there is no need to risk the call drop (because of hard handover It is possible to drop the call) and switch. Only when the condition of event 2F is satisfied, the judgment of event 2A will not be carried out.

Claims (11)

1, a kind of decision method for periodic report and channel interval hard switching may further comprise the steps:

In the 1st step, RNC sends measurement control order MEASUREMENT CONTROL according to sub-district, UE place and neighboring BS information to UE; When UE has the geographic area at the sub-district of connection or its place, adjacent area to have overloading to cover frequently, require UE to carry out inter-frequency measurement;

In the 2nd step, UE receives the control command that RNC sent, and measures according to concrete measurement requirement; In report cycle time slot reporting measurement result;

The 3rd step, after RNC receives reported result, the measured value of the pilot signal of each each sub-district of carrier frequency that storage UE reports; According to the measurement result of preserving, assess the signal quality of each carrier frequency according to following manner: $Q_{\mathrm{carrierj}}=10\·\mathrm{Log}{M}_{\mathrm{carrierj}}=W_j\·10\·\mathrm{Log}\left(\underset{i=1}{\overset{N_{\mathrm{Aj}}}{\mathrm{\Σ}}}{M}_{\mathrm{ij}}\right)+(1-W_j)\·10\·\mathrm{Log}{M}_{\mathrm{Bestj}}-H,$

Q _CarrierjIt is the mass value (dB) of certain carrier frequency j; M _CarrierjIt is certain carrier frequency quality of estimating;

M _IjIt is the measured value of all activated collection district pilots of carrier frequency j signal;

N _AjIt is number of cells in the carrier frequency j Active Set;

M _BestjIt is optimum subdistrict measured value among the carrier frequency j;

W _jIt is the weights coefficient among the carrier frequency j;

H is sluggish parameter;

Q _FrequencyjIt is the signal quality comprehensive assessment value of carrier frequency j;

In the 4th step, whether the RNC judgement satisfies incident 2F: if satisfy incident 2F, then changeed for the 10th step;

In the 5th step, whether the RNC judgement satisfies incident 2A: if satisfy incident 2A, then changeed for the 6th step;

Whether in the 6th step, RNC does respectively to admit control and Resources allocation to the virtual active collection sub-district in the carrier frequency that prepare to switch, and will admit and result that whether can Resources allocation reports to handover module among the RNC;

In the 7th step, RNC judges whether that all Target cells can both admit and Resources allocation; If satisfy, then changeed for the 9th step;

In the 8th step, RNC is according to the receivability sub-district, and whether judgement satisfies incident 2A once more; If do not satisfy, then changeed for the 10th step;

The 9th step after confirming to switch, sent switching command by RNC to UE, finished;

The 10th step, do not switch, finish.

2, decision method for periodic report and channel interval hard switching according to claim 1 is characterized in that, also comprises a step between the 4th step and the 5th step, i.e. the 11st step: after the judgement measurement result does not satisfy incident 2F, judge whether to satisfy incident 2D again;

3, decision method for periodic report and channel interval hard switching according to claim 1 is characterized in that, also comprises the judgement branch that another one is parallel between the 3rd step and the 4th step, and this judgement branch comprises the 12nd step, the 12.1st step and three steps of the 12.2nd step:

The 12nd step: carry out the judgement of incident 2E, look at whether to have the signal quality of carrier frequency to be lower than a fixed gate limit value; If there is not such carrier frequency, changeed for the 12.2nd step;

The 12.1st step: this carrier frequency is removed in measuring control messages, no longer this carrier frequency is monitored, need send out measurement control order again and give UE;

The 12.2nd step: this carrier frequency is monitored as usual.

4, according to claim 1,2 or 3 described decision method for periodic report and channel interval hard switching, it is characterized in that main scrambler, cell ID, main CPICH power, Tx that sub-district, UE place described in the 1st step and neighboring BS information comprise the sub-district divide set identifier, frequency information.

5, according to claim 1,2 or 3 described decision method for periodic report and channel interval hard switching, it is characterized in that, RNC described in the 1st step comprises the measurement filtration coefficient to the UE end, the sub-district, report cycle, the reporting quantities that need measurement and the CPICH information of respectively measuring the sub-district in the measurement control order MEASUREMENTCONTROL that UE sends, the measurement of amount of information such as measuring amount, report amount, the mode initialization that reports with UE is a periodic report simultaneously.

According to claim 1,2 or 3 described decision method for periodic report and channel interval hard switching, it is characterized in that 6, in the 2nd step, the amount that described UE measures is for switching the pilot signal quality or the intensity of each required sub-district.

7, according to claim 1,2 or 3 described decision method for periodic report and channel interval hard switching, it is characterized in that, in the 3rd step, described M _IjIf the inoperative carrier frequency, then each sub-district of each carrier frequency is virtual active collection sub-district.

8, according to claim 1,2 or 3 described decision method for periodic report and channel interval hard switching, it is characterized in that, in the 3rd step, described N _AjGenerally be no more than 4.

9, according to claim 1,2 or 3 described decision method for periodic report and channel interval hard switching, it is characterized in that, in the 3rd step, described M _BestjOffer from the UE measurement.

10, according to claim 1,2 or 3 described decision method for periodic report and channel interval hard switching, it is characterized in that, in the 3rd step, described W _jValue is between 0.3 to 0.8.

According to claim 1,2 or 3 described decision method for periodic report and channel interval hard switching, it is characterized in that 11, in the 3rd step, described H value is between 1.5dB to 3dB.

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