CN101902749A - Method and system for soft frequency reuse - Google Patents
Method and system for soft frequency reuse Download PDFInfo
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- CN101902749A CN101902749A CN2010102312955A CN201010231295A CN101902749A CN 101902749 A CN101902749 A CN 101902749A CN 2010102312955 A CN2010102312955 A CN 2010102312955A CN 201010231295 A CN201010231295 A CN 201010231295A CN 101902749 A CN101902749 A CN 101902749A
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Abstract
The invention provides a method and a system for soft frequency reuse. In the method, a primary carrier frequency and a secondary carrier frequency have the same overlay. The method comprises the following steps: a terminal receives a measurement starting instruction sent by a network side and measures the pilot signal quality of the cell and the pilot signal quality of adjacent cells; and if the terminal judges that the pilot signal quality of the cell is lower than a first set threshold and the pilot signal quality of at least one adjacent cell is higher than a second set threshold, the terminal is determined to work at the edge of the cell, and the terminal submits a report about the work of the terminal in the cell to the network side, so that the network side configures the terminal on the primary carrier frequency. The scheme of the invention not only can reduce co-channel interference but also can reduce the influence of weak overlay on the system.
Description
Technical field
The present invention relates to interference coordination technique, relate in particular to the method and system of soft-frequency reuse.
Background technology
TD SDMA (TD-SCDMA, Time Division-Synchronous CodeDivision Multiple Access) system and time-division Long Term Evolution (TD-LTE, Time Division-LongTerm Evolution) in the multicarrier system networking of system, for the identical networking structure, the carrier wave that each cell reuse is identical, just soft-frequency reuse; As shown in Figure 1, be 3 carrier system networking structures in the prior art, the carrier frequency of each sub-district all comprises f1, f2 and f3.
In each sub-district, the coverage of main carrier frequency and assistant carrier frequency can be identical, describes with example shown in Figure 2 below.Comprise three sub-districts among the figure: sub-district (CELL) 1, sub-district 2 and sub-district 3, the carrier frequency of each sub-district all comprises f1, f2 and f3, wherein, the main carrier frequency of sub-district 1 is that f1, assistant carrier frequency are f2 and f3, the main carrier frequency of sub-district 2 is that f2, assistant carrier frequency are f1 and f3, and the main carrier frequency of sub-district 3 is that f3, assistant carrier frequency are f1 and f2.
Like this, the UE that is operated in each cell edge may be operated on the same frequency, and this will cause very strong co-channel interference.For example, all may be operated on the f1, cause between UE1, UE2 and the UE3 interfering with each other at UE1, UE2 and the UE3 of cell edge.
In order to reduce co-channel interference, by adjusting the coverage of major-minor carrier frequency in the sub-district, the terminal of adjacent each cell edge is assigned to different carrier frequency respectively in the prior art, reduce the co-channel interference between cell edge UE.Be illustrated with the TD-SCDMA system below, Fig. 3 shows the scheme of soft-frequency reuse in the TD-SCDMA system, and this scheme makes the terminal of cell edge be in the alien frequencies operating state, particularly, the carrier frequency of the center configuration of CELL1 is f2 and f3, and the carrier frequency of edge configuration is f1; The carrier frequency of the center configuration of CELL2 is f1 and f3, and the carrier frequency of edge configuration is f2; The carrier frequency of the center configuration of CELL3 is f1 and f2, and the carrier frequency of edge configuration is f3; Like this, the terminal works that is operated in CELL1, CELL2 and CELL3 edge has reduced co-channel interference on different carrier frequency.The UE that is in center of housing estate can select to be operated on assistant carrier frequency or the main carrier frequency, and cell edge has only disposed main carrier frequency owing to do not dispose assistant carrier frequency, thereby the UE that is in the edge is operated on the main carrier frequency; Like this, if for the UE that is in center of housing estate has disposed assistant carrier frequency, UE carries out the signal quality monitoring, when this UE moves to cell edge, because assistant carrier frequency signal quality variation, and the main carrier frequency signal quality is better, UE sends to network side with the better information of main carrier frequency signal quality, the radio network controller of network side (RNC, Radio NetworkController) makes UE switch to main carrier frequency from assistant carrier frequency to the switching command that base station and UE issue the configuration main carrier frequency.
In order to adjust the coverage of major-minor carrier frequency in the sub-district, existing scheme is by the alien frequencies operational environment that reduces to create cell edge to the assistant carrier frequency coverage.In the TD-SCDMA system, main carrier frequency has common signal channel, by adjusting the signal strength signal intensity of common signal channel, just can adjust the coverage of main carrier frequency; Yet assistant carrier frequency does not have common signal channel, can't determine the coverage of assistant carrier frequency by common signal channel, can only limit the coverage of assistant carrier frequency by the maximum transmission power of the dedicated channel on the restriction assistant carrier frequency.Owing to limited the maximum transmission power of the dedicated channel on the assistant carrier frequency, when center of housing estate has building etc. to block, can produce coverage hole, cause weak covering the in zone that be blocked, make power system capacity and decreased performance.
As seen, adopt the identical soft-frequency reuse method of major-minor carrier frequency,, but caused the co-channel interference of cell edge though reduced weak covering.The soft-frequency reuse scheme that adopts the cell edge alien frequencies to cover though reduced co-channel interference, has produced weak covering.
Summary of the invention
The invention provides a kind of method of soft-frequency reuse, this method can either reduce weak covering, also can reduce co-channel interference.
The invention provides a kind of system of soft-frequency reuse, this system can either reduce weak covering, also can reduce co-channel interference.
A kind of method of soft-frequency reuse, major-minor carrier frequency covers identically in this method, and this method specifically comprises:
Terminal receives the startup measurement instruction that network side issues, and this district pilots signal quality and adjacent district pilots signal quality are measured;
Terminal judges goes out this district pilots signal quality and is lower than the first setting thresholding, and at least one adjacent district pilots signal quality is higher than second and sets thresholding, then determine the edge of terminal works in this sub-district, terminal reports its report that is operated in this cell edge to network side so that network side with terminal configuration on main carrier frequency.
A kind of system of soft-frequency reuse, major-minor carrier frequency covers identically in this system, and this system comprises RNC and terminal;
Described RNC is used for issuing to described terminal and start measures instruction, receives the report that is operated in this cell edge of described terminal to report, with terminal configuration on main carrier frequency;
Described terminal is used to receive the startup measurement instruction that RNC issues, and this district pilots signal quality and adjacent district pilots signal quality are measured; Described terminal judges goes out this district pilots signal quality and is lower than the first setting thresholding, and at least one adjacent district pilots signal quality is higher than second and sets thresholding, then determine terminal works at the edge of this sub-district, terminal reports it to be operated in the report of this cell edge to RNC.
From such scheme as can be seen, among the present invention, major-minor carrier frequency covers identical, has reduced weak covering; And terminal is determined terminal works when the edge of this sub-district according to this district pilots signal quality and adjacent district pilots signal quality, reports its report that is operated in this cell edge to network side so that network side with terminal configuration on main carrier frequency; Because the main carrier frequency of each sub-district is different, can make the terminal of cell edge be in the alien frequencies operating state, thereby, co-channel interference reduced.Like this, adopt the present invention program both to reduce weak covering, also reduced co-channel interference.
Description of drawings
Fig. 1 is 3 carrier system networking structure schematic diagrames in the prior art;
Fig. 2 be in the prior art in the 3 carrier system networking structures major-minor carrier frequency cover identical example;
Fig. 3 is the example that the cell edge alien frequencies covers continuously in the 3 carrier system networking structures in the prior art;
Fig. 4 is the method indicative flowchart of soft-frequency reuse of the present invention;
Fig. 5 is the method flow diagram example of soft-frequency reuse of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
The present invention is based on major-minor carrier frequency and cover identical realization soft-frequency reuse, thereby reduced weak covering.And, among the present invention, terminal is determined terminal works when the edge of this sub-district according to this district pilots signal quality and adjacent district pilots signal quality, reports its report that is operated in this cell edge to network side so that network side with terminal configuration on main carrier frequency; Because the main carrier frequency of each sub-district is different, can make the terminal of cell edge be in the alien frequencies operating state, thereby reduce co-channel interference.
Referring to Fig. 4, be the method flow diagram of soft-frequency reuse of the present invention, it may further comprise the steps:
Particularly, in this step, can be that terminal receives the startup that the RNC of network side issues and measures instruction.Network side can periodically issue to start to terminal measures instruction, also can issue to start to terminal randomly and measure instruction; All right, network side just sends to start to terminal and measures instruction when satisfying certain condition.Described certain condition for example is:
Network side judges whether terminal is operated in main carrier frequency:
If, judge then whether main carrier frequency load is higher, if the main carrier frequency load is higher, then network side issues to start to terminal and measures instruction, if the main carrier frequency load is not high, it is constant that then network side remains the working carrier frequency of terminal configuration;
Otherwise, carry out described network side and issue startup measurement instruction to terminal.
Described first sets thresholding and second sets thresholding and can obtain by terminal is carried out in-site measurement, particularly, can carry out field optimizing by network optimization parameter etc. and set thresholding and second and set thresholding to determine first; First sets thresholding can not be too high, if the first setting thresholding is too high, the situation erroneous judgement that can cause being in center of housing estate makes terminal switch to main carrier frequency for being in cell edge, and this will cause that assistant carrier frequency is vacant, and network capacity is descended; And second sets thresholding can not be too high, if the second setting thresholding is too high, can cause the situation that is in cell edge is failed to judge to being in center of housing estate, disposes and do not carry out main carrier frequency, causes increasing and disturb.
The network side receiving terminal send its be operated in the report of this cell edge after, with terminal configuration at main carrier frequency.Network side can specifically comprise terminal configuration at main carrier frequency: the RNC of network side sends the instruction that switches to main carrier frequency to base station and terminal, after base station and terminal receive instruction, the working carrier frequency of terminal is switched on the main carrier frequency; Natch, if network side know that terminal is current and be configured on the main carrier frequency, then can not carry out the switching of working carrier frequency.
In step 402, whether terminal places cell edge to judge to it, if place cell edge, then network side on main carrier frequency, has reduced co-channel interference with terminal configuration.Further, whether terminal can also place center of housing estate to judge to terminal, if place center of housing estate, network side can not adjusted the operating frequency of terminal, also can adjust the operating frequency of terminal according to actual needs, for example, can handle according to following mode:
It is main carrier frequency in the working carrier frequency of center of housing estate and terminal that network side is judged terminal works, judges the current main carrier frequency pattern of saving that whether is in:
If then network side judges whether allow to insert assistant carrier frequency, if allow to insert assistant carrier frequency, then network side is the terminal configuration assistant carrier frequency, if do not allow to insert assistant carrier frequency, it is constant that then network side remains the working carrier frequency of terminal configuration;
Otherwise it is constant that network side remains the working carrier frequency of terminal configuration.
Whether terminal judges it place the method for center of housing estate to be: terminal can not satisfy this district pilots signal quality and is lower than first and sets thresholding judging, and can not satisfy at least one adjacent district pilots signal quality simultaneously and be higher than second when setting thresholding, then determine to be operated in the center of this sub-district, report it to be operated in the report of this center of housing estate or do not report it to be operated in the report of this center of housing estate to network side to network side.Do not report its report that is operated in this center of housing estate to network side for terminal, and only it is operated in the mode of the report of cell edge, network side will not receive report and be defaulted as this terminal works at this center of housing estate.
Preferably, after step 403, further comprising the steps of:
Network side judges whether terminal is operated in main carrier frequency:
If the working carrier frequency that then remains terminal configuration is constant;
Otherwise, judge whether allow to insert main carrier frequency, if then on main carrier frequency, otherwise it is constant that network side remains the operating frequency of terminal configuration with terminal configuration for network side.
Preferably, after step 403, this may further comprise the steps:
Network side judges whether terminal is operated in main carrier frequency:
If the working carrier frequency that then remains terminal configuration is constant;
Otherwise, judge whether to allow to insert main carrier frequency, if allow to insert main carrier frequency, then judge the Interference Signal Code Power (ISCP of terminal, Interference Signal Code Power) whether value surpasses the 3rd and sets thresholding, if, then network side with terminal configuration on main carrier frequency, otherwise it is constant that network side remains the operating frequency of terminal configuration; If do not allow to insert main carrier frequency, the operating frequency that then remains terminal configuration is constant.
Referring to Fig. 5, be the method flow diagram example of soft-frequency reuse of the present invention, it may further comprise the steps:
Step 501, RNC judges whether terminal is operated in main carrier frequency, if then execution in step 502, otherwise execution in step 503.
Here be that example describes equally with TD-SCDMA, at network side, network management system allows RNC open the TD-SCDMA soft frequency multiplexing function, beginning execution in step 501.
This step is optional.
Step 502, RNC judges whether main carrier frequency load is higher, if then execution in step 503, otherwise it is constant to remain the working carrier frequency of terminal configuration.
This step is optional, if this step not, correspondingly, step 501 is: RNC judges whether terminal is operated in main carrier frequency, if it is constant that then RNC remains the working carrier frequency of terminal configuration, otherwise execution in step 503.
Step 503, RNC issues to start to terminal and measures instruction, determines that according to the feedback of terminal terminal is in center of housing estate or cell edge, if be in center of housing estate, then execution in step 504, otherwise execution in step 508.
After instruction is measured in the startup that terminal reception RNC issues, carry out event 2b and measure, this event 2b measures and specifically comprises:
Whether terminal judges satisfies this district pilots signal quality is lower than the first setting thresholding, and at least one adjacent district pilots signal quality is higher than second and sets thresholding, if, then determine the edge of terminal works in this sub-district, terminal reports its report that is operated in this cell edge to RNC, and RNC knows that terminal works is at cell edge after receiving this announcement newspaper; And, terminal can not satisfy this district pilots signal quality and is lower than first and sets thresholding judging, and can not satisfy at least one adjacent district pilots signal quality simultaneously and be higher than second when setting thresholding, determine the center of terminal works in this sub-district, do not report it to be operated in the report of this center of housing estate to RNC, RNC does not receive terminal to report, and it is operated in the report of this center of housing estate, determines current this center of housing estate that is in of terminal.
Step 504, RNC judges that the current working carrier frequency of terminal is assistant carrier frequency or main carrier frequency, if assistant carrier frequency, it is constant that then RNC remains the working carrier frequency of terminal configuration, if main carrier frequency, then execution in step 505.
Step 505, RNC judges that whether present mode is to save the main carrier frequency pattern, if then execution in step 506, otherwise that RNC remains the working carrier frequency of terminal configuration is constant.
Step 506, RNC judges whether allow to insert assistant carrier frequency, if then execution in step 507, otherwise that RNC remains the working carrier frequency of terminal configuration is constant.
Whether saturated in this step, can allow to insert assistant carrier frequency by judging judge whether of assistant carrier frequency, if do not have saturatedly, then allow to insert assistant carrier frequency, if saturated, then refusal inserts assistant carrier frequency.
In the above-mentioned flow process, step 505 and 506 can only be carried out one of them step, just only whether is in judgement of saving the main carrier frequency pattern or the judgement that only whether allows to insert assistant carrier frequency; Also can delete step 505 and 506 simultaneously.
Step 507, RNC is the terminal configuration assistant carrier frequency.
RNC is the terminal configuration assistant carrier frequency, and terminal is switched to assistant carrier frequency from main carrier frequency.
Step 508, RNC judges whether terminal is operated in main carrier frequency, if the working carrier frequency that then remains terminal configuration is constant, otherwise, execution in step 509.
Step 509, RNC judges whether allow to insert main carrier frequency, if then execution in step 510, otherwise that RNC remains the working carrier frequency of terminal configuration is constant.
Step 510, RNC judges whether the ISCP value of terminal surpasses the 3rd and set thresholding, if then execution in step 511, otherwise it is constant that RNC remains the working carrier frequency of terminal configuration.
The ISCP value has reflected the current situation about being disturbed of terminal, if the current interference that is subjected to of terminal is less, can remain the working carrier frequency of terminal configuration, be that assistant carrier frequency is constant, if the current interference that is subjected to of terminal is bigger, then need terminal is switched to main carrier frequency from assistant carrier frequency, to reduce interference.Be used to carry out that the ISCP value judges the 3rd sets thresholding and can determine according to actual needs.
Step 511, RNC with terminal configuration on main carrier frequency.
In the above-mentioned flow process, step 509 and 510 can only be carried out one of them step, just only whether allows the judgement that inserts the judgement of main carrier frequency or only carry out the ISCP value; Also can delete step 509 and 510 simultaneously.
The present invention also provides a kind of system configuration schematic diagram of soft-frequency reuse, and major-minor carrier frequency covers identically in this system, and this system specifically comprises RNC and terminal,
Described RNC is used for issuing to described terminal and start measures instruction, receives the report that is operated in this cell edge of described terminal to report, with terminal configuration on main carrier frequency;
Described terminal is used to receive the startup measurement instruction that RNC issues, and this district pilots signal quality and adjacent district pilots signal quality are measured; Described terminal judges goes out this district pilots signal quality and is lower than the first setting thresholding, and at least one adjacent district pilots signal quality is higher than second and sets thresholding, then determine terminal works at the edge of this sub-district, terminal reports it to be operated in the report of this cell edge to RNC.
Alternatively, described terminal comprises first judge module, be used to judge this district pilots signal quality and be lower than the first setting thresholding, and at least one adjacent district pilots signal quality is higher than second and sets thresholding, determine the edge of terminal works, report it to be operated in the report of this cell edge to RNC in this sub-district.
Alternatively, described terminal comprises second judge module, be used for to satisfy this district pilots signal quality and being lower than first and setting thresholding judging, and can not satisfy at least one adjacent district pilots signal quality simultaneously and be higher than second when setting thresholding, determine the center of terminal works, report it to be operated in the report of this center of housing estate or do not report it to be operated in the report of this center of housing estate to RNC to RNC in this sub-district.
The present invention is applicable to the identical networking structure in any system.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. the method for a soft-frequency reuse is characterized in that, major-minor carrier frequency covers identical, and this method specifically comprises:
Terminal receives the startup measurement instruction that network side issues, and this district pilots signal quality and adjacent district pilots signal quality are measured;
Terminal judges goes out this district pilots signal quality and is lower than the first setting thresholding, and at least one adjacent district pilots signal quality is higher than second and sets thresholding, then determine the edge of terminal works in this sub-district, terminal reports its report that is operated in this cell edge to network side so that network side with terminal configuration on main carrier frequency.
2. the method for claim 1 is characterized in that, after described terminal was measured this district pilots signal quality and adjacent district pilots signal quality, this method further comprised:
Terminal judges goes out to satisfy this district pilots signal quality and is lower than the first setting thresholding, and can not satisfy at least one adjacent district pilots signal quality simultaneously and be higher than second when setting thresholding, determine the center of terminal works in this sub-district, terminal reports it to be operated in the report of this center of housing estate or does not report it to be operated in the report of this center of housing estate to network side to network side.
3. method as claimed in claim 2 is characterized in that, described terminal reports it to be operated in the report of this center of housing estate or not after network side reports its report that is operated in this center of housing estate, this method comprises to network side:
Network side is judged terminal works at center of housing estate, and the working carrier frequency that remains terminal configuration is constant.
4. method as claimed in claim 2 is characterized in that, described terminal reports it to be operated in the report of this center of housing estate or not after network side reports its report that is operated in this center of housing estate, this method comprises to network side:
It is main carrier frequency at center of housing estate and working carrier frequency that network side is judged terminal works, judges the current main carrier frequency pattern of saving that whether is in:
If then network side judges whether allow to insert assistant carrier frequency, if allow to insert assistant carrier frequency, then network side is the terminal configuration assistant carrier frequency, if do not allow to insert assistant carrier frequency, it is constant that then network side remains the working carrier frequency of terminal configuration;
Otherwise it is constant that network side remains the working carrier frequency of terminal configuration.
5. the method for claim 1 is characterized in that, described terminal is after network side reports its report that is operated in this cell edge, and this method comprises:
Network side judges whether terminal is operated in main carrier frequency:
If the working carrier frequency that then remains terminal configuration is constant;
Otherwise, judge whether allow to insert main carrier frequency, if then on main carrier frequency, otherwise it is constant that network side remains the operating frequency of terminal configuration with terminal configuration for network side.
6. the method for claim 1 is characterized in that, described terminal is after network side reports its report that is operated in this cell edge, and this method comprises:
Network side judges whether terminal is operated in main carrier frequency:
If the working carrier frequency that then remains terminal configuration is constant;
Otherwise, judge whether to allow to insert main carrier frequency, if allow to insert main carrier frequency, whether the Interference Signal Code Power ISCP value of then judging terminal surpasses the 3rd and sets thresholding, if, then network side with terminal configuration on main carrier frequency, otherwise it is constant that network side remains the operating frequency of terminal configuration; If do not allow to insert main carrier frequency, the operating frequency that then remains terminal configuration is constant.
7. as each described method in the claim 1 to 6, it is characterized in that the startup that described terminal reception network side issues is measured before the instruction, this method comprises:
Network side judges whether terminal is operated in main carrier frequency:
If, judge then whether main carrier frequency load is higher, if the main carrier frequency load is higher, then network side issues to start to terminal and measures instruction, if the main carrier frequency load is not high, it is constant that then network side remains the working carrier frequency of terminal configuration;
Otherwise, carry out described network side and issue startup measurement instruction to terminal.
8. the system of a soft-frequency reuse is characterized in that, major-minor carrier frequency covers identically in this system, and this system comprises radio network controller (RNC) and terminal;
Described RNC is used for issuing to described terminal and start measures instruction, receives the report that is operated in this cell edge of described terminal to report, with terminal configuration on main carrier frequency;
Described terminal is used to receive the startup measurement instruction that RNC issues, and this district pilots signal quality and adjacent district pilots signal quality are measured; Described terminal judges goes out this district pilots signal quality and is lower than the first setting thresholding, and at least one adjacent district pilots signal quality is higher than second and sets thresholding, then determine terminal works at the edge of this sub-district, terminal reports it to be operated in the report of this cell edge to RNC.
9. system as claimed in claim 8, it is characterized in that, described terminal comprises first judge module, be used to judge this district pilots signal quality and be lower than the first setting thresholding, and at least one adjacent district pilots signal quality is higher than second and sets thresholding, determine the edge of terminal works, report it to be operated in the report of this cell edge to RNC in this sub-district.
10. system as claimed in claim 9, it is characterized in that, described terminal comprises second judge module, be used for to satisfy this district pilots signal quality and being lower than first and setting thresholding judging, and can not satisfy at least one adjacent district pilots signal quality simultaneously and be higher than second when setting thresholding, determine the center of terminal works, report it to be operated in the report of this center of housing estate or do not report it to be operated in the report of this center of housing estate to RNC to RNC in this sub-district.
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| CN2010102312955A CN101902749A (en) | 2010-07-14 | 2010-07-14 | Method and system for soft frequency reuse |
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| CN2010102312955A CN101902749A (en) | 2010-07-14 | 2010-07-14 | Method and system for soft frequency reuse |
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| CN106211092A (en) * | 2015-05-06 | 2016-12-07 | 普天信息技术有限公司 | The method of a kind of trunked communication system subdistrict frequency band resource distribution and base station |
| WO2019000279A1 (en) * | 2017-06-28 | 2019-01-03 | 华为技术有限公司 | Carrier power control method and apparatus, storage medium and computer program product |
| CN110768765A (en) * | 2018-07-27 | 2020-02-07 | 中国移动通信集团海南有限公司 | Method, device, equipment and medium for processing downlink data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102204310A (en) * | 2011-05-17 | 2011-09-28 | 华为技术有限公司 | Resource allocation method, apparatus and base station |
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| CN106211092B (en) * | 2015-05-06 | 2019-07-05 | 普天信息技术有限公司 | A kind of method of trunked communication system subdistrict frequency band resource allocation and base station |
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| CN110768765A (en) * | 2018-07-27 | 2020-02-07 | 中国移动通信集团海南有限公司 | Method, device, equipment and medium for processing downlink data |
| CN110768765B (en) * | 2018-07-27 | 2022-04-15 | 中国移动通信集团海南有限公司 | Method, device, equipment and medium for processing downlink data |
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Application publication date: 20101201 |