CN102404810A - Method for cell handover in TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system and device for cell handover in TD-SCDMA system - Google Patents
Method for cell handover in TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system and device for cell handover in TD-SCDMA system Download PDFInfo
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Abstract
The invention discloses a method for cell handover in a TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system and a device for the cell handover in the TD-SCDMA system. The method comprises the following steps of: acquiring the RSCP (Received Signal Code Power) measured value of a current cell and the RSCP measured value of each neighbor cell of the current cell; selecting neighbor cells respectively with an RSCP measured value larger than that of the current cell as target cells to be handed over; determining the priority of each of the target cells to be handed over according to the size of the RSCP measured values corresponding to the target cells to be handed over; and determining handover target cells from the target cells to be handed over according to the priorities of the target cells to be handed over, and the size relationship among corresponding cell signal quality measured values and preset threshold values, and carrying out cell handover. In the invention, the RSCP measured values and the cell signal quality measured values are adopted to judge whether the neighbor cells of the current cell meet cell handover or not, thereby achieving the aim that the cell mistaken handover is avoided by using the cell signal quality measured values when the RSCP measured values are inaccurate or on the high side due to the fact that interference exists in a frequency point where the cell is located.
Description
Technical field
The present invention relates to communication technical field, in particular, relate to method and the device that switch a kind of TD-SCDMA system (Time Division-Synchronous Code Division Multiple Access, TDS-CDMA system) sub-district.
Background technology
In communication system, when subscriber equipment from a sub-district (coverage that refers to base station or base station) when moving to another sub-district, need carry out channel for the not interrupt communication that keeps the mobile subscriber and switch, promptly accomplish the sub-district and switch.At present, in order to prevent to switch, adopt the measurement item that assessment is switched to confirm the sub-district that UE (User Equipment, subscriber equipment) finally switches in the mistake of carrying out occurring between the sub-district when switch the sub-district.
In the TD-SCDMA system, the measurement item that is used to assess switching is the RSCP (Received Signal Code Power, received signal code power) of PCCPCH (Primary Common Control Physical Channel, Primary Common Control Physical Channel).Wherein, PCCPCH fixedly is carried on 0,1 code channel of time slot TS0 (Timeslot, time slot), is to obtain according to the channel estimating to Midamble (training sequence in the TD-SCDMA system physical channel burst structure) to the measurement of its RSCP.Therefore, utilize RSCP to Serving cell and adjacent area thereof to concern and assess, whether the sub-district that final decision is assessed is suitable as switching target small area, if improper, continues handover evaluation is carried out in other sub-districts; If be fit to then UE (User Equipment, subscriber equipment) reported network side, with the switching target small area of this sub-district as the candidate.See also accompanying drawing 1 for confirming the schematic diagram of switching target small area in the prior art.
But in the cell switch process of prior art, the basis for estimation of assessing switching is to be based upon on the accurate based measurement of RSCP to carry out.And in current real network environment; Place, sub-district frequency receives following two kinds of situation influence, one of which, and the frequency in the system is owing to exist strong sub-district on network miss-configured neighboring cells or this frequency; And this sub-district does not provide when service for domestic consumer, makes to exist unknown co-frequency cell to disturb on this frequency; Its two, possibly have the interference of other electronic equipments on the frequency; Owing to there is above-mentioned interference, make in carrying out the process of switching the sub-district, cause the adjacent area RSCP measured value on this frequency higher.Therefore, in the process of confirming switching target small area according to the RSCP measured value, can cause deviation, and then cause the sub-district mistake to be switched.
Summary of the invention
In view of this, the invention provides method and device that a kind of TD-SCDMA system cell switches, solved in the prior art because the interference on the subdistrict frequency point makes the RSCP measured value higher the problem that causes the sub-district mistake to be switched.
For realizing above-mentioned purpose, the present invention provides following technical scheme:
The method that a kind of TD-SCDMA system cell switches comprises:
Obtain the received signal code power RSCP measured value of current area and each adjacent area thereof;
Choose the RSCP measured value greater than the adjacent area of said current area as to be switched Target cell;
According to the corresponding RSCP measured value size of each said to be switched Target cell, confirm the priority of each said to be switched Target cell;
Priority according to said each said to be switched Target cell; And the magnitude relationship of each said to be switched Target cell corresponding district signal quality measured values and predetermined threshold value; From each to be switched Target cell, confirm a switching target small area, and carry out the sub-district switching.
Preferably, the process of said definite each said to be switched Target cell priority is specially:
Size according to the corresponding RSCP measured value of each said to be switched Target cell compares;
Confirm that the corresponding said to be switched Target cell of maximum RSCP measured value is a limit priority, and successively each said to be switched Target cell is carried out priority arrangement.
Preferably, saidly confirm that from each to be switched Target cell a switching target small area is specially:
Choose the cell signal quality measured values of the highest to be switched Target cell of priority;
Whether judge the said cell signal quality measured values of choosing greater than predetermined threshold value, if confirm that then the highest to be switched Target cell of said priority is a switching target small area; If not, then choose the cell signal quality measured values of the to be switched Target cell of time priority, continue to carry out determining step, till determining switching target small area.
Preferably, said cell signal quality measured values is a signal to noise ratio.
Preferably, said cell signal quality measured values is a signal-to-jamming ratio.
Preferably, when said cell signal quality measured values is a signal to noise ratio, said predetermined threshold value at 3.5dB between the 5dB; When said cell signal quality measured values is a signal-to-jamming ratio, said predetermined threshold value can be set in-and 1dB is between the 2dB.
A kind of TD-SCDMA system cell device for switching comprises:
The RSCP acquiring unit is used to obtain the received signal code power RSCP measured value of current area and each adjacent area thereof;
Choose the unit, be used to choose adjacent area greater than said current area RSCP measured value as to be switched Target cell;
Priority determining unit is used for the size according to the corresponding RSCP measured value of each said to be switched Target cell, confirms the priority of each said to be switched Target cell;
The cell signal quality measured values acquiring unit is used to obtain each said to be switched Target cell corresponding district signal quality measured values of confirming priority;
The handover evaluation unit is used for the magnitude relationship according to each said to be switched Target cell corresponding district signal quality measured values and predetermined threshold value, from each to be switched Target cell, confirms a switching target small area;
Switch unit is used for carrying out the sub-district according to said switching target small area and switches.
Preferably, comprise in the said priority determining unit:
Comparing unit is used for the size of the corresponding RSCP measured value of each said to be switched Target cell is compared;
Arrangement units is used for confirming that the corresponding said to be switched Target cell of maximum RSCP measured value is a limit priority, and successively each said to be switched Target cell is carried out priority arrangement.
Preferably, comprise in the said handover evaluation unit:
Priority is chosen the unit, is used to choose the cell signal quality measured values of the highest to be switched Target cell of priority;
Whether judging unit is used to judge said cell signal quality measured values greater than predetermined threshold value, if confirm that then the highest to be switched Target cell of said priority is a switching target small area; If not, then return and choose in the to be switched Target cell of never choosing the unit, choose the cell signal quality measured values of the highest to be switched Target cell of priority again, till determining switching target small area.
Preferably, said cell signal quality measured values is signal to noise ratio or signal-to-jamming ratio.
Can know via above-mentioned technical scheme; Compared with prior art; The invention discloses method and device that a kind of TD-SCDMA system cell switches, RSCP measured value and cell signal quality measured values on the frequency adjacent area, current area place are judged, thereby confirmed switching target small area.At first, confirm that the qualified adjacent area of RSCP measured value is to be switched Target cell; Then, confirm the priority of each to be switched Target cell; Utilize the priority of confirming again; Corresponding district signal quality measured values (SIR or SNR) in each to be switched Target cell and threshold value are made comparisons; If cell signal quality measured values, thinks then that this to be switched Target cell quality is better greater than threshold value, be fit to switch; If cell signal quality measured values, thinks then that this to be switched Target cell is second-rate less than threshold value, be not suitable for as switching target small area.Adopting RSCP measured value and cell signal quality measured values to judge whether the adjacent area of current area meets through the present invention carries out the sub-district and switches; Reach on the frequency of place, sub-district and occur disturbing; When causing the RSCP measured value inaccurate or higher, the purpose of utilizing cell signal quality measured values to avoid the sub-district mistake to switch.
In addition, method of the present invention and device can also avoid sub-district mistake switching to cause switching back demodulation quality variation, cause step-out, make the problem of UE call drop, further guarantee and promote UE performance and speech quality.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
Fig. 1 is for confirming the schematic diagram of switching target small area in the prior art;
Fig. 2 is the method flow diagram a that the disclosed a kind of TD-SCDMA system cell of the embodiment of the invention switches;
Fig. 3 is embodiment of the invention disclosed method flow chart b;
Fig. 4 is embodiment of the invention disclosed method flow chart c;
Fig. 5 for when SNR is cell signal quality measured values among the Case001_b in the adjacent area 1 PDF of SNR scheme;
Fig. 6 for when SNR is cell signal quality measured values among the Case001_b in the adjacent area 1 CDF of SNR scheme;
Fig. 7 is the disclosed a kind of TD-SCDMA system cell device for switching structural representation d of the embodiment of the invention;
Fig. 8 is the disclosed apparatus structure sketch map of embodiment of the invention e;
Fig. 9 is the disclosed apparatus structure sketch map of embodiment of the invention f.
Embodiment
For quote and know for the purpose of, the explanation of the technical term that hereinafter uses, write a Chinese character in simplified form or abridge and sum up as follows:
TD-SCDMA system: Time Division-Synchronous Code Division Multiple Access, TDS-CDMA system;
PCCPCH:Primary Common Control Physical Channel, Primary Common Control Physical Channel;
Midamble: be the training sequence in the TD-SCDMA system physical channel burst structure;
RSSI:Received Signal Strength Indicator receives the signal strength signal intensity indication;
RSCP:Received Signal Code Power, received signal code power;
ISCP:Interference Signal Code Power, Interference Signal Code Power;
SIR:Signal to Intercell-Interference Ratio, signal-to-jamming ratio;
SNR:Signal to Noise Ratio, signal to noise ratio;
UE:User Equipment, subscriber equipment.
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
See also accompanying drawing 2, the method flow diagram for the disclosed a kind of TD-SCDMA system cell of the embodiment of the invention switches mainly may further comprise the steps:
Step S101 obtains the received signal code power RSCP measured value of current area and each adjacent area thereof.
In the TD-SCDMA system; Because PCCPCH fixedly is carried on time slot TS0 (Timeslot; Time slot) on 0,1 code channel; And the measurement item that is used to assess switching is the RSCP of PCCPCH, and for the current area at UE place with and each adjacent area on the RSCP measured value, be to obtain according to channel estimating to Midamble.Promptly obtain on the frequency of UE persistent district place and the RSCP measured value of the adjacent area on this frequency.
Step 102, choose the RSCP measured value greater than the adjacent area of said current area as to be switched Target cell.
When execution in step S102; Need in each adjacent area, choose and meet as the UE switching target small area as to be switched Target cell; Foundation is the size of the RSCP measured value of each adjacent area in the process of choosing; And in the process that switch the sub-district, then choose the RSCP measured value greater than the adjacent area of the RSCP measured value of UE place current area as to be switched Target cell.
Step S103 according to the corresponding RSCP measured value size of each said to be switched Target cell, confirms the priority of each said to be switched Target cell.
After carrying out above-mentioned steps S101 and step S102; Obtain qualified to be switched Target cell; Execution in step S103 then; To the corresponding RSCP measured value size of each qualified to be switched Target cell, confirm the priority of each said to be switched Target cell, for UE afterwards carries out the sub-district switching accurate more alternative condition is provided.
Step S104; Priority according to said each said to be switched Target cell; And the magnitude relationship of each said to be switched Target cell corresponding district signal quality measured values and predetermined threshold value, from each to be switched Target cell, confirm a switching target small area.
Step S105 carries out the sub-district and switches.
After the priority of confirming to be switched Target cell, need therefrom choose and be suitable as the switching target small area that UE carries out the sub-district switching.Therefore; It is cell signal quality measured to utilize UE to carry out, and obtains the cell signal quality measured values of each to be switched Target cell of confirming priority, and foundation is from height to low priority orders then; Size with to be switched Target cell corresponding district signal quality measured values and predetermined threshold value compares successively; According to result relatively, choose cell signal quality measured values greater than predetermined threshold value, and the highest to be switched Target cell of priority is a switching target small area; The switching target small area that last foundation is confirmed switches to UE in this sub-district, accomplishes the sub-district and switches.
Through the disclosed said method of the embodiment of the invention; Utilize to RSCP measured value and cell signal quality measured values double standards, judge whether the adjacent area of current area meets the condition that switch the sub-district of carrying out, promptly interference occurring; When causing the RSCP measured value inaccurate or higher; Can further utilize with cell signal quality measured values the cell quality of definite to be switched Target cell is judged, therefrom choose suitable the switching, and the to be switched preferably Target cell of cell quality be as the target switching cell; Carry out the sub-district then and switch, reached the purpose that prevents that the sub-district mistake from switching.
Need to prove, see also accompanying drawing 3, confirm the process of each said to be switched Target cell priority in the above-described embodiments, promptly specifically may further comprise the steps during execution in step S103:
Step S1031 compares according to the size of the corresponding RSCP measured value of each said to be switched Target cell.
Step S1032 confirms that the corresponding said to be switched Target cell of maximum RSCP measured value is a limit priority, and successively each said to be switched Target cell is carried out priority arrangement.
When execution in step S1031 and step S1032, at first, the RSCP measured value in each to be switched Target cell is compared; Then, confirm that the corresponding said to be switched Target cell of maximum RSCP measured value is a limit priority; At last, according to sorting from big extremely little order, what promptly preserved the first place is the corresponding to be switched Target cell of current limit priority, and other to be switched Target cells are preserved according to the mode that reduces priority successively.
Need to prove, see also accompanying drawing 4, from each to be switched Target cell, confirm the process of a switching target small area in the above-described embodiments, promptly when execution in step S104, specifically may further comprise the steps:
Step S1041 chooses the cell signal quality measured values of the highest to be switched Target cell of priority.
Whether step S1042 judges the said cell signal quality measured values of choosing greater than predetermined threshold value, if, execution in step S1043 then; If, then do not return execution in step S1041
Step S1043 confirms that then the highest to be switched Target cell of said priority is a switching target small area.
At execution in step S1041 during to step S1043, the priority of the to be switched Target cell of confirming to above-mentioned steps is handled one by one.At first, choose the cell signal quality measured values of the to be switched Target cell of the limit priority of confirming after the execution in step S103; Then; This cell signal quality measured values and predetermined threshold value are compared; If the current cell signal quality measured values that compares is greater than predetermined threshold value; Think that then the quality of the to be switched Target cell that this cell signal quality measured values is corresponding is better, be suitable as the switching target small area of UE; If less than predetermined threshold value, then think the second-rate of this to be switched Target cell, even if the RSCP measured value of this to be switched Target cell is suitable; Think that also this to be switched Target cell is not suitable for the switching target small area as UE; Therefore, choose new to be switched Target cell again and compare, promptly choose the cell signal quality measured values of the to be switched Target cell of time priority; Also we can say; Choose the cell signal quality measured values of the highest to be switched Target cell of current priority, continue to carry out determining step, till determining switching target small area.Execution in step S105 more at last, switch the sub-district of accomplishing UE.
In embodiment disclosed by the invention, at first, confirm to be switched Target cell to step S102 through execution in step S101; Then, execution in step S103 again confirms the priority of each to be switched Target cell, and with its according to from big to little, preserve from height to low order; Then, execution in step S104 confirms that the to be switched Target cell greater than predetermined threshold value is a switching target small area again; Last execution in step S105 accomplishes to the sub-district of UE and switches.Adopting RSCP measured value and cell signal quality measured values to judge whether the adjacent area of current area meets through the present invention carries out the sub-district and switches; Interference is appearring; Cause under the inaccurate or higher situation of RSCP measured value, avoid the sub-district purpose of switching by mistake thereby can utilize cell signal quality measured values to reach.
In addition, can also avoid the sub-district mistake to switch through the above embodiment of the present invention disclosed method and device and cause switching back demodulation quality variation, cause step-out, make the problem of UE call drop, further guarantee and promote UE performance and speech quality.
Need to prove that in the above-mentioned disclosed embodiment of the present invention, the cell signal quality measured values of each adjacent area that gets access to can be signal to noise ratio snr, also can be for being signal-to-jamming ratio SIR.Wherein, SNR utilizes the symbol data after the joint-detection to estimate to obtain; And SIR utilizes received signal code power RSCP to obtain with the relevant ratio of Interference Signal Code Power ISCP, i.e. SIR=RSCP/ISCP.
Understand the disclosed method of the present invention for ease, be illustrated with the application of this method in reality below:
As SNR during as cell signal quality measured values, predetermined threshold value is 4dB (about predetermined threshold value is the empirical value in the practical application, or experiment value, so predetermined threshold value can be set in 3.5dB and gets final product between the 5dB).The present invention is not limited in this about the setting of predetermined threshold value.
See also table 1:
Wherein, Case001_a:
UE reside in frequency A 19 sub-districts (current RSCP drops to-88dBm) above, 100 sub-districts on the frequency B (current RSCP is-81dBm), 58 sub-districts on the frequency B (current RSCP for-67dBm) with frequency C on 85 sub-districts (current RSCP for-80dBm) be its adjacent area.
The inventive method: at first according to the size of RSCP measured value, judge that the adjacent area is stronger than Serving cell (sub-district, current UE place), can know by last table 1; 100 sub-districts, 58 sub-districts and 85 sub-districts are all eligible; Confirm the priority of 100 sub-districts, 58 sub-districts and 85 sub-districts then according to the size of RSCP measured value, hence one can see that, and 58 native region priorities are the highest; Take second place in 85 sub-districts, and 100 native region priorities are minimum.
Table 1
In the present invention, added the signal quality judgement, therefore, 58 sub-districts the highest from priority begin, and relatively whether its corresponding SNR measured value is greater than predetermined threshold value 4dB.By knowing in the table 1, the SNR measured value of 58 sub-districts (adjacent area 2) is greater than 4dB, so meet the condition of handover evaluation, therefore 58 sub-districts are the switching target small areas that are suitable as UE, can't cause decreased performance.
Wherein, Case001_b:
UE reside in frequency A 19 sub-districts (current RSCP drops to-88dBm) above; 100 sub-districts on the frequency B (current RSCP is-81dBm) with frequency C on 85 sub-districts (current RSCP for-80dBm) be its adjacent area, and on frequency B, exist 58 unknown sub-districts (current RSCP for-67dBm).
In the scheme of prior art: according to the size of RSCP measured value in the table 1, UE will switch on 100 sub-districts on the frequency B.But owing on frequency B, exist strong with disturbing frequently (because adjacent area 2 is not configured to the adjacent area of Serving cell; UE does not know to have this sub-district to exist generally speaking; So can cause the measured value of adjacent area 1 higher), therefore 100 sub-districts are not suitable as the Target cell of switching.
And utilize method of the present invention: judge according to RSCP and SNR measured value, identical among the process of judgement and the Case001_a:
At first, judge that whether the adjacent area is stronger than Serving cell, can be known by last table 1 according to the size of RSCP measured value; 100 sub-districts and 85 sub-districts are eligible, confirm the priority of 100 sub-districts and 85 sub-districts then according to the size of RSCP measured value, and hence one can see that; 100 native region priorities are the highest, take second place in 85 sub-districts; In then according to the present invention to the judgement of cell signal quality measured values.
See also accompanying drawing 5 and accompanying drawing 6, represent the SNR measured value of 100 sub-districts (adjacent area 1), wherein, in accompanying drawing 5 (PDF figure), abscissa is SNR, the probability distribution graph of PDF figure expression SNR; In accompanying drawing 6 (CDF figure); Abscissa is SNR, and CDF characterizes the SNR cumulant, promptly representes to account for to all SNR measured values of this frequency from minimum value (negative infinite) ratio of whole SNR measured values; Going up Fig. 5 and Fig. 6 thus can find out; The SNR measured value of 100 sub-districts (adjacent area 1) is less than threshold value 4dB, and by knowing in the table 1, the SNR measured value of 85 sub-districts (adjacent area 3) is greater than threshold value 4dB.So after aspect RSCP and SNR two, assessing switching, confirm that 85 sub-districts are more suitable for the switching target small area as UE, and the probability that UE will have more than 98% switches on 85 sub-districts of frequency C.
Therefore, adopt the disclosed method of the embodiment of the invention, thereby can effectively avoid because with the problem of disturbing the higher sub-district mistake that causes of the measured value that causes to switch frequently.
When SIR as the cell signal quality, its predetermined threshold value is set at 0dB.(about predetermined threshold value is the empirical value in the practical application, or experiment value, thus predetermined threshold value can be set in-1dB gets final product between the 2dB).The present invention is not limited in this about the setting of predetermined threshold value.
See also table 2:
Wherein, Case002_a:
UE reside in frequency A 19 sub-districts (current RSCP drops to-88dBm) above, 100 sub-districts on the frequency B (current RSCP is-81dBm), 58 sub-districts on the frequency B (current RSCP for-72dBm) with frequency C on 85 sub-districts (current RSCP for-80dBm) be its adjacent area.
Wherein, Case002_b:
UE reside in frequency A 19 sub-districts (current RSCP drops to-88dBm) above; Last 100 sub-districts of frequency B (current RSCP is-81dBm) with frequency C on 85 sub-districts (current RSCP for-80dBm) be its adjacent area, and on frequency B, exist 58 unknown sub-districts (current RSCP for-72dBm).Exist by force with disturbing frequently because frequency B goes up, therefore 100 sub-districts are what to be not suitable for as the Target cell that switches.
Table 2
No matter be in Case002_a, or among the Case002_b, all judge that cell signal quality measured values is SIR in the present embodiment according to RSCP and cell signal quality measured values, and SIR=RSCP/ISCP, by knowing corresponding ratio in the last table 2.Because other processes repeat no more with identical when cell signal quality measured values is SNR here, carry out obtaining among the Case002_a after the reference with said process, the switching target small area of UE is 58 sub-districts (adjacent areas 2); And the switching target small area of UE is 85 sub-districts (adjacent areas 3) among the Case002_b.
Describe the method that a kind of TD-SCDMA system cell switches among the disclosed embodiment of the invention described above in detail; Can adopt the device of various ways to realize for method of the present invention; Therefore the invention also discloses a kind of TD-SCDMA system cell device for switching, provide concrete embodiment below and be elaborated.
See also accompanying drawing 7; Be the disclosed a kind of TD-SCDMA system cell device for switching structural representation of the embodiment of the invention, mainly comprise: RSCP acquiring unit 701, choose unit 702, priority determining unit 703, cell signal quality measured values acquiring unit 704, handover evaluation unit 705 and switch unit 706.
Choose unit 702, be used to choose adjacent area greater than said current area RSCP measured value as to be switched Target cell.
Cell signal quality measured values acquiring unit 704 is used to obtain each said to be switched Target cell corresponding district signal quality measured values of confirming priority.
Need to prove, see also accompanying drawing 8, in the disclosed priority determining unit 703 of the invention described above embodiment, mainly comprise: comparing unit 7031 and arrangement units 7032.
Comparing unit 7031 is used for the size of the corresponding RSCP measured value of each said to be switched Target cell is compared.
Need to prove, see also accompanying drawing 9, in the disclosed handover evaluation of the invention described above embodiment unit 705, mainly comprise: priority is chosen unit 7051 and judging unit 7052.
Priority is chosen unit 7051, is used to choose the cell signal quality measured values of the highest to be switched Target cell of priority.
Whether judging unit 7052 is used to judge said cell signal quality measured values greater than predetermined threshold value, if confirm that then the highest to be switched Target cell of said priority is a switching target small area; If not, then return and choose in the to be switched Target cell of never choosing the unit, choose the cell signal quality measured values of the highest to be switched Target cell of priority again, till determining switching target small area.
When carrying out the sub-district switching to UE; Obtain the current area (being Serving cell) at UE place by the RSCP acquiring unit 701 in the disclosed device of the embodiment of the invention; With and the RSCP measured value of adjacent area; In choosing unit 702, the RSCP measured value of adjacent area and the RSCP measured value of current area are compared then, choose qualified adjacent area, promptly choose adjacent area greater than current area RSCP measured value as to be switched Target cell as to be switched Target cell.
Then; In priority determining unit 703, the to be switched Target cell of confirming is carried out Determination of priority: at first; RSCP measured value size in comparing unit 7031 in the more to be switched one by one Target cell; Then in arrangement units 7032 according to confirming the priority of each to be switched Target cell to little mode from big, and be arranged in the first the highest to be switched Target cell of priority that is.
After confirming to be switched Target cell priority, in handover evaluation unit 705, cell signal quality measured values in successively that priority is the highest to be switched Target cell and predetermined threshold value are relatively.Wherein, the cell signal quality measured values of to be switched Target cell is obtained by cell signal quality measured values acquiring unit 704.Through the judgement of handover evaluation unit 705, confirm cell signal quality measured values greater than the to be switched Target cell of predetermined threshold value as switching target small area.
At last, by switch unit 706 UE is switched to the switching target small area from current area, switch the sub-district of accomplishing UE.
Need to prove that said in the above-described embodiments cell signal quality measured values is signal to noise ratio or signal-to-jamming ratio.
In sum:
Through embodiment of the invention disclosed method and device; Utilize to RSCP measured value and cell signal quality measured values double standards, judge whether the adjacent area of current area meets the condition that switch the sub-district of carrying out, promptly interference occurring; When causing the RSCP measured value inaccurate or higher; Can further utilize with cell signal quality measured values the cell quality of definite to be switched Target cell is judged, therefrom choose suitable the switching, and the to be switched preferably Target cell of cell quality be as the target switching cell; Carry out the sub-district then and switch, reached the purpose that prevents that the sub-district mistake from switching.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed device of embodiment, because it is corresponding with the embodiment disclosed method, so description is fairly simple, relevant part is partly explained referring to method and is got final product.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can be directly with the software modules of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (10)
1. the method that the TD-SCDMA system cell switches is characterized in that, comprising:
Obtain the received signal code power RSCP measured value of current area and each adjacent area thereof;
Choose the RSCP measured value greater than the adjacent area of said current area as to be switched Target cell;
According to the corresponding RSCP measured value size of each said to be switched Target cell, confirm the priority of each said to be switched Target cell;
Priority according to said each said to be switched Target cell; And the magnitude relationship of each said to be switched Target cell corresponding district signal quality measured values and predetermined threshold value; From each to be switched Target cell, confirm a switching target small area, and carry out the sub-district switching.
2. method according to claim 1 is characterized in that, the process of said definite each said to be switched Target cell priority is specially:
Size according to the corresponding RSCP measured value of each said to be switched Target cell compares;
Confirm that the corresponding said to be switched Target cell of maximum RSCP measured value is a limit priority, and successively each said to be switched Target cell is carried out priority arrangement.
3. method according to claim 1 is characterized in that, saidly confirms that from each to be switched Target cell a switching target small area is specially:
Choose the cell signal quality measured values of the highest to be switched Target cell of priority;
Whether judge the said cell signal quality measured values of choosing greater than predetermined threshold value, if confirm that then the highest to be switched Target cell of said priority is a switching target small area; If not, then choose the cell signal quality measured values of the to be switched Target cell of time priority, continue to carry out determining step, till determining switching target small area.
4. method according to claim 1 is characterized in that, said cell signal quality measured values is a signal to noise ratio.
5. method according to claim 1 is characterized in that, said cell signal quality measured values is a signal-to-jamming ratio.
6. method according to claim 1 is characterized in that, when said cell signal quality measured values is a signal to noise ratio, said predetermined threshold value at 3.5dB between the 5dB; When said cell signal quality measured values is a signal-to-jamming ratio, said predetermined threshold value can be set in-and 1dB is between the 2dB.
7. a TD-SCDMA system cell device for switching is characterized in that, comprising:
The RSCP acquiring unit is used to obtain the received signal code power RSCP measured value of current area and each adjacent area thereof;
Choose the unit, be used to choose adjacent area greater than said current area RSCP measured value as to be switched Target cell;
Priority determining unit is used for the size according to the corresponding RSCP measured value of each said to be switched Target cell, confirms the priority of each said to be switched Target cell;
The cell signal quality measured values acquiring unit is used to obtain each said to be switched Target cell corresponding district signal quality measured values of confirming priority;
The handover evaluation unit is used for the magnitude relationship according to each said to be switched Target cell corresponding district signal quality measured values and predetermined threshold value, from each to be switched Target cell, confirms a switching target small area;
Switch unit is used for carrying out the sub-district according to said switching target small area and switches.
8. device according to claim 7 is characterized in that, comprises in the said priority determining unit:
Comparing unit is used for the size of the corresponding RSCP measured value of each said to be switched Target cell is compared;
Arrangement units is used for confirming that the corresponding said to be switched Target cell of maximum RSCP measured value is a limit priority, and successively each said to be switched Target cell is carried out priority arrangement.
9. device according to claim 7 is characterized in that, said handover evaluation comprises in the unit:
Priority is chosen the unit, is used to choose the cell signal quality measured values of the highest to be switched Target cell of priority;
Whether judging unit is used to judge said cell signal quality measured values greater than predetermined threshold value, if confirm that then the highest to be switched Target cell of said priority is a switching target small area; If not, then return and choose in the to be switched Target cell of never choosing the unit, choose the cell signal quality measured values of the highest to be switched Target cell of priority again, till determining switching target small area.
10. device according to claim 7 is characterized in that, said cell signal quality measured values is signal to noise ratio or signal-to-jamming ratio.
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| CN201010288062.9A CN102404810B (en) | 2010-09-15 | 2010-09-15 | Method for cell handover in TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system and device for cell handover in TD-SCDMA system |
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| CN201010288062.9A CN102404810B (en) | 2010-09-15 | 2010-09-15 | Method for cell handover in TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system and device for cell handover in TD-SCDMA system |
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