CN102256319A - Communication device and method for selecting communication cell in communication system - Google Patents
Communication device and method for selecting communication cell in communication system Download PDFInfo
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Abstract
The invention discloses a communication device and a method for selecting a communication cell in a communication system. A communication frequency range supported by the communication system comprises a plurality of communication frequency points, and the method comprises the following steps of: measuring pilot signal receiving power or reference signal receiving power of a plurality of cells corresponding to one of the communication frequency points; judging whether the maximum in the measured pilot signal receiving power or reference signal receiving power exceeds a first threshold value, if so, determining the total receiving power of a communication cell corresponding to the pilot signal receiving power or reference signal receiving power which exceeds the first threshold value, otherwise, measuring pilot signal receiving power or reference signal receiving power of a plurality of cells corresponding to other communication frequency points in the communication frequency points, and returning to the judging step; and selecting the current service cell based on the determined total receiving power.
Description
Technical field
The disclosed content of the application relates to communicator and select the method for communication cell in communication system.
Background technology
Terminal is when selecting communication cell at present, and (SignalReceived Power Reference RSRP), is linked into this sub-district as long as the RSRP of measurement frequency corresponding district satisfies the certain intensity requirements mmk terminal to a measuring reference signals received power.It is not optimum inserting the sub-district according to measure R SRP merely, the performance in the time of often can't guaranteeing the terminal operate as normal.
In addition, also exist a kind of pilot tone signal interference ratio that utilizes merely to carry out the technical scheme that the main plot is selected in the prior art, this technical scheme need travel through all carrier frequency of frequency bands supported by terminal, will cause the process lengthening of Cell searching and access sub-district like this, thereby influence user experience.In addition, this scheme also is not suitable for LTE (Long Term Evolution) system, (Reference Signal Received Quality is RSRQ) as the quality of reception of assessment reference signal, and non-traditional pilot tone signal interference ratio because the LTE system adopts Reference Signal Received Quality.
Summary of the invention
The application discloses a kind of method of selecting communication cell in communication system on the one hand, and the communications band of described communication system support comprises a plurality of communication frequencies, and described method comprises:
Measure the corresponding a plurality of sub-districts of one of described a plurality of communication frequencies the pilot signal received power (Received Signal Code Power, RSCP) or Reference Signal Received Power (RSRP);
Judge whether value maximum in measured pilot signal received power or the Reference Signal Received Power surpasses first threshold value,
If not, then measure the pilot signal received power or the Reference Signal Received Power of a plurality of sub-districts of other communication frequency correspondence of described a plurality of communication frequencies, and the step of getting back to described judgement;
If determine to surpass the total received power of the communication cell of the pilot signal received power of first threshold value or Reference Signal Received Power correspondence; And
Select current service cell based on the total received power of determining.
As a kind of selection, said method can comprise:
Measure the pilot signal received power or the Reference Signal Received Power of a plurality of sub-districts of described a plurality of communication frequency correspondences;
From measured pilot signal received power or Reference Signal Received Power, determine the pilot signal received power or the Reference Signal Received Power that exceed default first threshold value;
Measure the total received power of the communication cell of determined pilot signal received power or Reference Signal Received Power correspondence; And
Select current area as Serving cell based on the total received power of determining.
The communicator that provides according to a further aspect in the invention can comprise:
Measuring unit, the pilot signal received power or the Reference Signal Received Power of a plurality of sub-districts that one of a plurality of communication frequencies of measuring described communicator support are corresponding;
Judging unit is judged value maximum in measured pilot signal received power or the Reference Signal Received Power and is surpassed first threshold value; And
The RSSI determining unit determine to surpass the total received power of the communication cell of the pilot signal received power of first threshold value or Reference Signal Received Power; And
The cell selecting unit selects current area as Serving cell based on the total received power of determining.
As a kind of selection, said apparatus can comprise:
Measuring unit is measured the pilot signal received power or the Reference Signal Received Power of a plurality of sub-districts of described a plurality of communication frequency correspondences;
Judging unit is judged the pilot signal received power or the Reference Signal Received Power that exceed default first threshold value from measured pilot signal received power or Reference Signal Received Power;
The RSSI determining unit determines to exceed the total received power of the communication cell of the pilot signal received power of default first threshold value or Reference Signal Received Power correspondence; And
The cell selecting unit selects current area as Serving cell based on the total received power of determining.
Can have one of following beneficial effect at least according to above-mentioned communicator with in the method for in communication system, selecting communication cell:
1, the method for simple relatively measurement pilot frequency receiving intensity or reference symbol receiving intensity, can effectively reduce current owing to pilot tone/reference signal received signal quality intensity that measurement pilot signals intensity selection persistent district causes is higher, but the quality of reception of Traffic Channel is very poor, terminal can't operate as normal the probability that occurs of situation, can guarantee that terminal selects the channel quality of Serving cell better;
2, simple relatively measurement pilot frequency receives the method for the signal interference ratio or the reference symbol quality of reception, can effectively reduce the Cell searching time and measure complexity; Or
3. because RSRP/RSCP is the amount that base band is measured, also need to be down-converted to base band behind the received RF signal, carry out physical layer demodulation sign indicating number, and RSSI is the amount of radio-frequency measurement, when doing the RSRP/RSCP measurement, less change can realize rssi measurement, increases less to terminal complexity.
Description of drawings
Fig. 1 is the method for selecting communication cell in communication system according to an execution mode of the application;
Fig. 2 is the schematic diagram that shows the communication frequency of TD-LTE frequency range;
Fig. 3 is the method for selecting communication cell in communication system according to the application's another one execution mode;
Figure 4 shows that functional block diagram according to the communication equipment of an execution mode of the application; And
Fig. 5 is the functional block diagram of the cell selecting unit shown in Fig. 4.
Embodiment
Method and the communications setting of selecting communication cell in communication system according to the application's execution mode are described with reference to the accompanying drawings.
Fig. 1 shows the method 1000 of selecting communication cell in communication system according to an execution mode of the application.As shown in Figure 1, in step S101, terminal order or select and measure frequency in a plurality of communication frequencies that communication system supports randomly.For example, as known in the art, 2300-2400MHz is the important deployment frequency range of TD-LTE, as shown in Figure 2.For purposes of illustration, Fig. 2 has exemplarily disposed communication frequency f1, f2, f3, f4 and the f5 of 5 20MHz in 2300-2400MHz frequency range system side.Wherein each frequency is supported a plurality of communication cells, for example supposes f5 corresponding 3 communication cell cell 1, cell2 and cell 3 (not shown).As example, in this step, select frequency f5.
In step S102, measure the pilot signal RSCP or the RSRP of a plurality of sub-districts of selected communication frequency correspondence.For example measure the cell 1 of communication frequency f5 correspondence respectively, the pilot signal RSCP of cell2 and cell3 or RSRP.
Whether value maximum among RSCP that judgement is measured in step S102 in step S103 or the RSRP surpasses first threshold value.For example, judge the cell 1 of communication frequency f5 correspondence, whether the RSCP of cell2 and cell 3 or RSRP surpass first threshold value.In one embodiment, can adopt the judgement mode in the existing standard to judge whether RSCP or RSRP surpass first threshold value.First threshold value can preestablish according to existing standard, for example the determination methods among the 3GPP TS36.304 chapters and sections 5.2.3.2Cell Selection Criterion.
If the result who judges among the step S103 is for being, then in step S104, measure the communication cell with maximum RSCP or RSRP total received power (Received Signal StrengthIndication, RSSI).For example, in step S103, judge the RSCP or the RSRP maximum of cell 2 correspondences, and surpassed first threshold value, then in this step, determine the total received power RSSI of cell 2.
Then, in step S105-106,, determine whether and to be chosen as current service cell with surpassing communication cell with maximum RSCP or RSRP based on the RSSI that in step S104, measures.Particularly, in step S105, determine the pilot signal quality of reception (Ec/N0) or the Reference Signal Received Quality (RSRQ) of this communication cell (for example above-mentioned cell2); Judge in step S106 then whether determined Ec/N0 or RSRQ surpass the preset second threshold value, if then select this communication cell as current service cell.Wherein, second threshold value is configurable, particularly, can dispose according to network planning empirical value, also can be according to parameter configuration, for example, according to PLMN priority, terminal power grade etc. is configured, and wherein, and Ec/N0 and RSRQ can be according to formulas 1) and 2) 1 determine.
Ec/N0=RSCP/RSSI formula 1)
RSRQ=N * RSRP/RSSI formula 2)
Wherein N is Resource Block (Resource Block, RB) number of rssi measurement bandwidth.
Be example also,, then cell 2 be chosen as current service cell if Ec/N0 in cell 2 or RSRQ surpass the preset second threshold value with cell 2.
If the result who determines in above-mentioned steps S103 does not have first threshold value of surpassing for a plurality of RSCP or the RSRP that measures in step S102, then determine whether to also have the not support frequency of traversal at step S107, if have, then in step S108, select next frequency in a plurality of communication frequencies, f4 for example, and get back to step S102; Otherwise communication cell is selected failure, for example selectively provides the cell selecting failure in step S111.
If being determined Ec/N0 or RSRQ, the result who determines do not surpass the preset second threshold value in above-mentioned steps S105, then determine whether to also have the not support frequency of traversal at step S109, if have, execution in step S108 then, otherwise, in step S110, from all measurement sub-districts, select the best sub-district of Ec/N0 or RSRQ as current service cell or the failure of notice terminal cell selecting.
Below with reference to the method 2000 of in communication system selecting communication cell of Fig. 3 description according to another execution mode of the application.
As shown in Figure 3, in step S201, select to measure frequency in a plurality of communication frequencies that communication system supports at random.In step S202, measure the pilot signal RSCP or the RSRP of a plurality of sub-districts of selected communication frequency correspondence.Judge in step S203 whether the maximum RSCP or the RSRP that measure surpass first threshold value in step S202.If the result who judges is for being then to measure above the RSCP of first threshold value or the RSSI of the pairing communication cell of RSRP in step S204.Above-mentioned steps 201～204 is identical with step S101～104, therefore repeats no more.
Then, determine whether to also have the not support frequency of traversal at step S205, if do not have, then in step S207, based on the RSSI that in step S204, calculates, by above-mentioned formula 1) and 2) calculate the Ec/N0 or the RSRQ of each sub-district respectively, and measure from all and to select the best sub-district of Ec/N0 or RSRQ as current service cell sub-districts; Otherwise, select next frequency and return step S202 and handle at step S206.
If the result who determines in above-mentioned steps S203 does not have first threshold value of surpassing for the RSCP or the RSRP of the maximum that all frequencies of measuring are measured in step S202, then determine whether to also have the not support frequency of traversal at step S205, if no, then notice terminal cell selecting failure in step S207; Otherwise in step S206, select next frequency in a plurality of communication frequencies, and get back to step S202.
Below with reference to the communicator 4000 that can realize above-mentioned processing 1000 and 2000 of Fig. 4 description according to an execution mode of the application.In an enforcement side, communicator 4000 can be the LTE terminal.
As shown in Figure 4, communicator 4000 comprises measuring unit 401, judging unit 402, RSSI determining unit 403 and cell selecting unit 404.
In one embodiment, the pilot signal received power or the Reference Signal Received Power of a plurality of sub-districts that one of a plurality of communication frequencies of measuring unit 401 measurement communicators 4000 supports are corresponding.
According to the application's a embodiment, the total received powers that cell selecting unit 404 is determined based on RSSI determining unit 403 determine to have the pilot signal quality of reception or the Reference Signal Received Quality of the communication cell of maximal received power or Reference Signal Received Power.Surpass second threshold value if judging unit 402 is judged the determined pilot signal quality of reception or Reference Signal Received Quality, then the pilot signal quality of reception or the Reference Signal Received Quality of the communication cell of maximal received power or Reference Signal Received Power determined to have in cell selecting unit 404 based on described total received power.Wherein, do not surpass second threshold value if judging unit 402 is judged the determined pilot signal quality of reception or Reference Signal Received Quality, then described cell selecting unit 404 selects the best communication cell of the pilot signal qualities of reception or Reference Signal Received Quality as the current Serving cell of wanting.
If the pilot signal quality of reception in a plurality of communication frequencies in the communication cell of correspondence or Reference Signal Received Quality all surpass described second threshold value, then cell selecting unit 404 provides the information of selecting the communication cell failure.
Particularly, as shown in Figure 5, cell selecting unit 404 also can further comprise Ec/N0 or RSRQ determination module 4041 and select module 4042.Wherein, Ec/N0 or RSRQ determination module 4041 determine to surpass the Ec/N0 or the RSRQ of communication cell of the pilot signal correspondence of first threshold value based on described total received power (RSSI).Select 4042 selections of module communication cell corresponding as current service cell with the highest Ec/N0 or RSRQ value.
As a kind of selection, determine to surpass the Ec/N0 or RSRQ of communication cell of pilot signal correspondence of first threshold value based on described total received power (RSSI) at Ec/N0 or RSRQ determination module 4041 after, select module 4042 to judge whether determined Ec/N0 or RSRQ surpass second threshold value, if the communication cell that then select to surpass the pilot signal RSCP of first threshold value or RSRP correspondence is as current service cell; If not, select next communication frequency, and repeat above-mentioned processing by measuring unit 401, judging unit 402, RSSI determining unit 403 and cell selecting unit 404 as measuring object.In addition, if the result who measures on the communication frequency of all supports of communication system does not have the Ec/N0 of sub-district or RSRQ to be higher than second thresholding, then select the highest sub-district of Ec/N0 or RSRQ value as current service cell, perhaps directly notify the failure of terminal cell selecting.
Also with 5 communication frequency f1 shown in Figure 2, f2, f3, f4 and f5 are example.Measuring unit 401 is for example at first selected frequency f5 and is measured the pilot signal RSCP or the RSRP of a plurality of sub-districts of its correspondence.For example measure the cell 1 of communication frequency f5 correspondence, pilot signal RSCP or the RSRP of cell2 and cell 3.Whether pilot signal RSCP that 402 judgements of judging unit are measured in unit 401 or the maximum among the RSRP surpass preset first threshold.For example, judging unit 402 is judged the RSCP or the RSRP maximum of cell 2 correspondences, and has surpassed first threshold value, and then RSSI determining unit 403 is determined the total received power RSSI of cell 2.4041 of the Ec/N0 of cell selecting unit 404 or RSRQ determination modules calculate Ec/N0 or RSRQ among the cell2 according to determining RSSI, and judge further whether Ec/N0 or RSRQ in cell2 surpass the preset second threshold value, if then control unit 4042 is chosen as current service cell with cell 2; Otherwise, select for example f4 repetition aforesaid operations of other frequencies.
The above only is the application's a preferred implementation; be not thus the restriction the application claim; every equivalent structure or equivalent flow process conversion that utilizes present specification and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical field, all in like manner be included in the application's the scope of patent protection.
Claims (14)
1. method of in communication system, selecting communication cell, the communications band of described communication system support comprises a plurality of communication frequencies, described method comprises:
Measure the pilot signal received power or the Reference Signal Received Power of the corresponding a plurality of sub-districts of one of described a plurality of communication frequencies;
Judge whether value maximum in measured pilot signal received power or the Reference Signal Received Power surpasses first threshold value,
If not, then measure the pilot signal received power or the Reference Signal Received Power of a plurality of sub-districts of other communication frequency correspondence of described a plurality of communication frequencies, and the step of getting back to described judgement;
If determine to surpass the total received power of the communication cell of the pilot signal received power of first threshold value or Reference Signal Received Power correspondence; And
Select current area as Serving cell based on the total received power of determining.
2. the method for claim 1, wherein the step of described selection comprises:
Determine to have the pilot signal quality of reception or the Reference Signal Received Quality of the communication cell of maximal received power or Reference Signal Received Power based on described total received power;
Judge the determined pilot signal quality of reception or Reference Signal Received Quality and surpass second threshold value; And
The communication cell of selecting this pilot signal received power or Reference Signal Received Power correspondence is as Serving cell.
3. the method for claim 1, wherein the step of described selection comprises:
Determine to have the pilot signal quality of reception or the Reference Signal Received Quality of the communication cell of maximal received power or Reference Signal Received Power based on described total received power;
Judge the determined pilot signal quality of reception or Reference Signal Received Quality and do not surpass second threshold value; And
Select the best communication cell of the pilot signal quality of reception or Reference Signal Received Quality as Serving cell.
4. the method for claim 1, wherein, if the pilot signal quality of reception in described a plurality of communication frequency in the communication cell of correspondence or Reference Signal Received Quality all surpass described second threshold value, then provide the information of selecting the communication cell failure.
5. method of in communication system, selecting communication cell, the communications band of described communication system support comprises a plurality of communication frequencies, described method comprises:
Measure the pilot signal received power or the Reference Signal Received Power of a plurality of sub-districts of described a plurality of communication frequency correspondences;
From measured pilot signal received power or Reference Signal Received Power, determine the pilot signal received power or the Reference Signal Received Power that exceed default first threshold value;
Measure the total received power of the communication cell of determined pilot signal received power or Reference Signal Received Power correspondence; And
Select current area as Serving cell based on the total received power of determining.
6. method as claimed in claim 5, wherein, select the step of current service cell to comprise based on the total received power of determining:
Determine each the self-corresponding pilot signal quality of reception or Reference Signal Received Quality based on the total received power of determining; And
Select the communication cell corresponding as Serving cell with the highest pilot signal quality of reception or Reference Signal Received Quality.
7. communicator comprises:
Measuring unit, the pilot signal received power or the Reference Signal Received Power of a plurality of sub-districts that one of a plurality of communication frequencies of measuring described communicator support are corresponding;
Judging unit is judged value maximum in measured pilot signal received power or the Reference Signal Received Power and is surpassed first threshold value; And
The RSSI determining unit determine to surpass the total received power of the communication cell of the pilot signal received power of first threshold value or Reference Signal Received Power; And
The cell selecting unit selects current area as Serving cell based on the total received power of determining.
8. communicator as claimed in claim 7, wherein,
The pilot signal quality of reception or the Reference Signal Received Quality of the communication cell of maximal received power or Reference Signal Received Power determined to have in described cell selecting unit based on described total received power;
Wherein, if described judgment unit judges goes out the determined pilot signal quality of reception or Reference Signal Received Quality surpasses second threshold value, then described cell selecting unit selects the communication cell of this pilot signal received power or Reference Signal Received Power correspondence as Serving cell.
9. communicator as claimed in claim 7, wherein said cell selecting unit determine to have the pilot signal quality of reception or the Reference Signal Received Quality of the communication cell of maximal received power or Reference Signal Received Power based on described total received power;
Wherein, do not surpass second threshold value if described judgment unit judges goes out the determined pilot signal quality of reception or Reference Signal Received Quality, then described cell selecting unit selects the best communication cell of the pilot signal quality of reception or Reference Signal Received Quality as Serving cell.
10. communicator as claimed in claim 7, if the pilot signal quality of reception in described a plurality of communication frequency in the communication cell of correspondence or Reference Signal Received Quality all surpass described second threshold value, then described cell selecting unit provides the information of selecting the communication cell failure.
11. communicator as claimed in claim 7, wherein, described cell selecting unit further comprises:
Ec/N0 or RSRQ determination module based on described total received power, are determined the pilot signal quality of reception or the Reference Signal Received Quality of the communication cell of the pilot signal correspondence that surpasses first threshold value; And
Select module, judge the determined pilot signal quality of reception or Reference Signal Received Quality and surpass second threshold value, and to select described communication cell be current service cell.
12. a communicator comprises:
Measuring unit is measured the pilot signal received power or the Reference Signal Received Power of a plurality of sub-districts of described a plurality of communication frequency correspondences;
Judging unit is judged the pilot signal received power or the Reference Signal Received Power that exceed default first threshold value from measured pilot signal received power or Reference Signal Received Power;
The RSSI determining unit determines to exceed the total received power of the communication cell of the pilot signal received power of default first threshold value or Reference Signal Received Power correspondence; And
Current service cell is selected based on the total received power of determining in the cell selecting unit.
13. communicator as claimed in claim 12, wherein, each the self-corresponding pilot signal quality of reception or Reference Signal Received Quality are determined based on the total received power of determining in described cell selecting unit, and select the communication cell corresponding with the highest pilot signal quality of reception or Reference Signal Received Quality as current service cell.
14. communicator as claimed in claim 12, wherein, described cell selecting unit further comprises:
Ec/N0 or RSRQ determination module based on described total received power, are determined the pilot signal quality of reception or the Reference Signal Received Quality of the communication cell of the pilot signal correspondence that surpasses first threshold value; And
Select module, select the communication cell corresponding as current service cell with the highest pilot signal quality of reception or Reference Signal Received Quality.
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| WO2013170690A1 (en) * | 2012-05-18 | 2013-11-21 | 华为技术有限公司 | Downlink multi-point signal quality measurement method and device |
| CN103987108A (en) * | 2013-02-08 | 2014-08-13 | 意法-爱立信有限公司 | Initial cell search method and apparatus, and mobile terminal |
| CN105101282A (en) * | 2014-05-21 | 2015-11-25 | 中兴通讯股份有限公司 | Discovery signal measurement method, discovery signal measurement device and user terminal |
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| CN101442786A (en) * | 2008-12-31 | 2009-05-27 | 华为技术有限公司 | Method and apparatus for determining target district |
| CN101595746A (en) * | 2007-02-05 | 2009-12-02 | 艾利森电话股份有限公司 | The E-UTRAN neighbor cell measurement of network control |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013170690A1 (en) * | 2012-05-18 | 2013-11-21 | 华为技术有限公司 | Downlink multi-point signal quality measurement method and device |
| CN103987108A (en) * | 2013-02-08 | 2014-08-13 | 意法-爱立信有限公司 | Initial cell search method and apparatus, and mobile terminal |
| CN105101282A (en) * | 2014-05-21 | 2015-11-25 | 中兴通讯股份有限公司 | Discovery signal measurement method, discovery signal measurement device and user terminal |
| WO2015176397A1 (en) * | 2014-05-21 | 2015-11-26 | 中兴通讯股份有限公司 | Method, device and user terminal for measuring discovery signal |
| KR101858439B1 (en) | 2014-05-21 | 2018-05-16 | 지티이 코포레이션 | Method, device and user terminal for measuring discovery signal |
| US10439741B2 (en) | 2014-05-21 | 2019-10-08 | Zte Corporation | Method, device and user terminal for measuring with discovery signal |
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