CN101668294B - Method and system for reducing interferences - Google Patents
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Abstract
The invention discloses a method for reducing interferences, which comprises the following steps that: auxiliary frequency point information is set in system information in advance; and a home base station searches an adjacent cell, and reads and selects frequency points on the basis of main frequency point information and the auxiliary frequency point information in the system information of the adjacent cell so as to plan the frequency points of a cell to be established. The invention also discloses a system for reducing the interferences, which comprises a setting unit, and a reading and planning unit, wherein the setting unit is used for setting the auxiliary frequency point information in the system information in advance; and the reading and planning unit is used for reading and selecting the frequency points on the basis of the main frequency point information and the auxiliary frequency point information in the system information of the adjacent cell from the setting unit so as to plan the frequency points of the cell to be established. By adopting the method and the system, the interferences generated between home base stations, and between the home bases stations and macro base stations can be effectively reduced.
Description
Technical Field
The present invention relates to interference reduction technologies, and in particular, to a method and a system for reducing interference between home base stations and macro base stations.
Background
At the beginning of 3G networking, most operators choose to solve the coverage problem first with macro coverage scheme and then the capacity problem, since the size of the users is not large. Here, the macro coverage scheme is a wide coverage scheme, and aims to solve the problem of improving the coverage rate by covering most of the outdoor area with an outdoor macro base station. In the 3G service development stage, the scale of users is steadily increased, and when the number of users is increased, a series of problems such as insufficient capacity of accessed users, reduced data transmission rate, poor user experience and the like are caused by adopting a rough macro coverage scheme. However, users who have earlier opened 3G services at the beginning of 3G networking are already used to use high-speed data services, and at this time, the extensive macro coverage scheme cannot well meet the coverage requirements of high-speed data services in home areas, especially the coverage requirements of high-speed data services in the home areas of users in dense residential areas. If the coverage strategy of the macro coverage scheme is adjusted and re-planned according to the coverage characteristics of the user, a series of problems of high investment cost, low investment efficiency, incapability of perceiving high-value users and the like are caused. Thus, it is difficult for operators to weigh and decide on both coverage and capacity. Introducing a home base station, in particular a wireless fidelity (wifi) home base station, as a complement to a macro base station may make a trade-off in both coverage and capacity. Current wifi home base stations are typically only used for Packet Services (PS).
The home base station is used to cover most of the indoor area. The introduction of the femtocell can reduce investment cost besides making a trade-off between coverage and capacity. The femtocell is different from a macro base station, is a simple small base station without configuration, and basically can realize indoor and outdoor seamless connection and refined coverage of 3G when being used together with the macro base station for covering most of outdoor area, thereby exerting the advantage of high-speed data service of 3G. And the macro base station is not required to be designed in advance as a macro coverage scheme which adopts a macro base station extensive type singly, and then the coverage strategy of the macro coverage scheme is adjusted and planned again along with the increase of the user scale, particularly the user scale in a home area. Obviously, the scheme of cooperatively using the home base station and the macro base station is adopted, and the investment cost can be greatly reduced compared with a macro coverage scheme singly adopting the macro base station. The home base station is a technology initiated by an operator, and is different from a technology promoted by a device manufacturer, the home base station is a technology which is first interested and actively promoted by the operator, because: the home base station conforms to the strategy that the investment cost of operators is reduced to occupy the home network market, and meanwhile, the network construction cost is reduced. However, in the scheme of using the home base station and the macro base station in cooperation, interference may occur between the home base stations and the macro base station, which may reduce user experience.
Four network architectures and their features of the existing femtocell are as follows.
As shown in fig. 1, the first network architecture is an Iub interface based architecture. The architecture includes: femto cell (FemtoCELL) is a very small cell, a security gateway, a Radio Network Controller (RNC), a Mobile Switching Center (MSC) and a general packet radio service support point (SGSN). The FemtoCELL is connected with the security gateway through an Iub interface; the security gateway is connected with the RNC; the RNC is connected with the MSC through an Iu CS interface, and is connected with the SGSN through an Iu PS interface. The framework is characterized in that: the protocol stack distribution is similar to the current protocol distribution, the deployment is simple, and the rapid implementation is convenient; each FemtoCELL belongs to the jurisdiction of one RNC, can move in the jurisdiction range of the RNC, and does not need the SIM card to authenticate; the transmission requirement on the Iub interface is high, but in view of that HSDPA does not require strict timing relationship, and only requires high transmission delay for a Dedicated Channel (DCH) with low rate, the current 512K/1M ADSL can support; the configuration is fully responsible for the RNC; it is difficult to obtain differential information in charging.
As shown in fig. 2, the second network architecture is an Iu interface based architecture. The architecture includes: FemtoCELL, security gateway, Iu concentrator, MSC and SGSN. The FemtoCELL is connected with the security gateway through an Iu interface; the security gateway is connected with the IU concentrator; the IU concentrator is connected with the MSC through an IU CS interface, and the IU concentrator is connected with the SGSN through an IU PS interface. The framework is characterized in that: the Iu interface structure is more open than the Iub interface, so that a multi-vendor supply environment is easily formed; the Iu interface can simplify the function of the concentrator and is easy to connect a plurality of femtocells; the Iu interface is controlled by a single node, so that the synchronization requirement of an Iub interface is avoided; simplifying the inter-office signaling flow into an intra-office signaling flow; single-node control; the structure of a Session Initiation Protocol (SIP) is easy to evolve, and only the Iu protocol needs to be replaced; the Iu interface is easy to introduce Iu-Flex, and a non-access node selection function (NNSF) mechanism exists; this mechanism is required for load sharing since FemtoCell access is difficult to control.
As shown in fig. 3, the third network architecture is a UMA interface based architecture. The architecture includes: FemtoCELL, Generic Access Network Controller (GANC), MSC and SGSN. Wherein, the FemtoCELL is connected with the GANC through the UMA interface; the GANC is connected with the MSC through an Iu CS interface, and the GANC is connected with the SGSN through an Iu PS interface. The architecture is characterized by being basically consistent with the architecture based on the Iu interface in the second network architecture, but needs more changes compared with the second network architecture. As shown in fig. 4, the fourth network architecture is based on an IP Multimedia System (IMS), is an architecture after 3GP is upgraded to 3G evolution technology (LTE), and belongs to the final planning. The architecture includes: and the FemtoCELL, the IMS System, the GPRS router (GGSN) and the SGSN are connected.
Here, the existing home base station can have the following requirements: the home base station has the function of simulating the UE; receiving other existing cell information, automatically planning carrier frequency, automatically planning scrambling code and automatically planning adjacent cell by simulating the function of UE, and automatically establishing the adjacent cell; the femtocell has a function of receiving a signal of a public macrocell and performing clock synchronization. However, for the scheme using the home base station and the macro base station in cooperation, interference may occur between the home base stations and between the home base station and the macro base station, but no solution is available at present, which can effectively reduce the interference occurring between the home base stations and the macro base station, that is, the existing home base station does not have a function of minimizing the interference between the automatically established cell and other cells.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method for reducing interference, which can effectively reduce the interference generated between home base stations and between a home base station and a macro base station.
Another object of the present invention is to provide a system for reducing interference, which can effectively reduce the interference generated between home base stations and between a home base station and a macro base station.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of reducing interference, the method comprising the steps of:
A. auxiliary frequency point information is set in system information in advance;
B. and the femtocell searches for the adjacent cell, reads and selects frequency points based on the main frequency point information and the auxiliary frequency point information in the system information of the adjacent cell to plan the frequency points of the cell to be established.
Step A, setting time slot conversion point information in system information in advance; and step B, reading and selecting the time slot conversion point based on the time slot conversion point information in the system information of the adjacent cell to plan the time slot conversion point of the cell to be established.
In step B, the planning of the frequency points of the cell to be established specifically includes:
b11, selecting n adjacent cells meeting the strongest signal intensity from all the searched adjacent cells;
b12, acquiring the main frequency point information and the auxiliary frequency point information of the n adjacent cells, and sequencing according to the signal intensity from big to small: f1, F2, F3... Fn;
and B13, acquiring and selecting frequency points in the frequency range which can be used by the current home base station, so that the frequency points of the selected cell to be established are all pilot frequencies of F1, F2 and F F3..
When the frequency point of the selected cell to be established cannot reach all the pilot frequencies of F1, F2 and F3... times.Fn, the frequency point of the selected cell to be established is consistent with the Fn;
alternatively, step B13 is followed by:
b14, acquiring the searched main frequency point information of all adjacent cells, and sequencing the main frequency point information according to the signal intensity from big to small as follows: f1, f2, f3... fm, and m is an integer greater than n;
and B15, acquiring and selecting frequency points in the frequency range which can be used by all the femtocell, so that the frequency points of the selected cell to be established and all the pilot frequencies of the f1, the f2 and the f f3..
And when the frequency point of the selected cell to be established can not reach all the pilot frequencies of f1, f2 and f3..
In step B, the planning of the time slot transition point of the cell to be established specifically includes:
and B21, acquiring and selecting time slot conversion points based on the searched time slot conversion point information of all the adjacent cells, so that the time slot conversion points of the selected cell to be established are consistent with the time slot conversion points of the adjacent cells of the cell to be established.
When the timeslot conversion points of the neighboring cells of the cell to be established are not completely consistent, B21 further includes:
and B22, making the time slot switching point of the selected cell to be established consistent with the time slot switching point of the adjacent cell with the same frequency of the cell to be established.
Wherein, step B22 is followed by: and acquiring and selecting a scrambling code based on scrambling code information in all searched system information of the adjacent cells to plan the scrambling code of the cell to be established.
The scrambling code for planning the cell to be established specifically comprises: and when the frequency point of the cell to be established is the same frequency as the frequency point of the adjacent cell of the cell to be established, enabling the scrambling code of the selected cell to be established to be orthogonal to the scrambling code of the adjacent cell with the same frequency.
After the planning of the cell to be established is completed in the mode of selecting the frequency point, the time slot conversion point and the scrambling code of the cell to be established, the femtocell continues to search the neighbor cell of the cell to be established according with the selected mode, and adds the neighbor cell into the neighbor cell list of the cell to be established to complete the planning of the neighbor cell of the cell to be established.
A system for reducing interference, the system comprising: a setting unit and a reading and planning unit; wherein,
the setting unit is used for setting auxiliary frequency point information in the system information in advance;
and the reading and planning unit is used for reading from the setting unit and selecting the frequency points based on the main frequency point information and the auxiliary frequency point information in the system information of the adjacent cell to plan the frequency points of the cell to be established.
The setting unit is further configured to set timeslot conversion point information in system information in advance; the reading and planning unit is further configured to read from the setting unit and select a timeslot conversion point based on timeslot conversion point information in the system information of the neighboring cell to plan the timeslot conversion point of the cell to be established.
The reading and planning unit is further configured to read from the setting unit and select a scrambling code based on scrambling code information in all searched neighbor cell system information, so as to plan a scrambling code of a cell to be established.
Wherein the reading and programming unit comprises: the frequency point planning module of the cell to be established is used for selecting n adjacent cells meeting the strongest signal intensity in all the searched adjacent cells; acquiring the main frequency point information and the auxiliary frequency point information of the n adjacent cells, and sequencing the main frequency point information and the auxiliary frequency point information according to the signal intensity from big to small: f1, F2, F3... Fn; and acquiring and selecting a frequency point in a frequency range which can be used by the current home base station, so that the frequency point of the selected cell to be established is different from all the pilot frequencies of F1, F2 and F3..
When the frequency point of the selected cell to be established cannot reach all pilot frequencies of F1, F2 and F3..
When the frequency point of the selected cell to be established cannot reach all pilot frequencies of F1, F2, and F3.. f1, f2, f3... fm, and m is an integer greater than n; and acquiring and selecting frequency points in the frequency range which can be used by all the femtocell base stations, so that the frequency points of the selected cell to be established and all the different frequencies of the f1, the f2 and the f f3..
When the frequency point of the selected cell to be established cannot reach all the pilot frequencies of f1, f2 and f3..
Wherein the reading and programming unit comprises: and the planning module of the time slot conversion point of the cell to be established is used for acquiring and selecting the time slot conversion point based on the searched time slot conversion point information of all the adjacent cells so as to ensure that the time slot conversion point of the selected cell to be established is consistent with the time slot conversion point of the adjacent cell of the cell to be established.
And when the time slot conversion points of the adjacent cells of the cell to be established are not completely consistent, the planning module of the time slot conversion points of the cell to be established is further used for enabling the time slot conversion points of the selected cell to be established to be consistent with the time slot conversion points of the adjacent cells with the same frequency as the cell to be established.
Wherein the reading and programming unit comprises: and the scrambling code planning module is used for enabling the scrambling codes of the selected cell to be established to be orthogonal to the scrambling codes of the same-frequency adjacent cells when the frequency points of the cell to be established and the frequency points of the adjacent cells of the cell to be established have the same frequency.
The main frequency point information is originally set in the system information, but only the main frequency point information is insufficient, because the auxiliary frequency points are the same and have interference between adjacent cells even if the main frequency points are different, the cells need to be planned by further utilizing the auxiliary frequency point information, and therefore the interference is reduced. The invention adds auxiliary frequency point information in system information in advance; then, the femtocell searches for the neighboring cell, reads and selects the frequency point based on the main frequency point information and the auxiliary frequency point information in the system information of the neighboring cell to plan the frequency point of the cell to be established, so that the interference between the cell to be established and the neighboring cell can be reduced.
By adopting the invention, the interference generated between the home base stations and the macro base station can be effectively reduced, so that the home base station has the function of reducing the interference between the automatically established cell and other cells to the minimum.
Drawings
Fig. 1 is a schematic diagram illustrating a first network architecture of a conventional femtocell;
fig. 2 is a schematic diagram illustrating a second network architecture of a conventional hnb;
fig. 3 is a schematic composition diagram of a third network architecture of a conventional hnb;
fig. 4 is a schematic composition diagram of a fourth network architecture of a conventional femtocell;
fig. 5 is a schematic flow chart of the implementation of the method of the present invention.
Detailed Description
The core idea of the invention is as follows: the invention adds auxiliary frequency point information in system information in advance; the femtocell searches for the adjacent cell, reads and selects the frequency point based on the main frequency point information and the auxiliary frequency point information in the system information of the adjacent cell to plan the frequency point of the cell to be established, and can reduce the interference between the cell to be established and the adjacent cell.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.
As shown in fig. 5, a method of reducing interference, the method comprising:
It should be noted here that, since the main frequency point information is originally set in the system information, but only the main frequency point information is not enough, because the auxiliary frequency points are the same and have interference between adjacent cells even if the main frequency points are different, the cells need to be planned by further using the auxiliary frequency point information, so as to achieve the purpose of reducing interference. The invention adds the auxiliary frequency point information in the system information in advance, so that the home base station searches the adjacent cells after starting, and the main frequency point information and the auxiliary frequency point information of the adjacent cells around the home base station can be searched.
Here, step 101 further includes setting timeslot conversion point information in the system information in advance; step 102 further includes reading and selecting a timeslot conversion point based on timeslot conversion point information in the system information of the neighboring cell to plan a timeslot conversion point of the cell to be established.
Here, step 102 further includes obtaining and selecting a scrambling code based on the scrambling code information in all the searched neighbor cell system information, so as to plan the scrambling code of the cell to be established.
In summary, after the planning of the cell to be established is completed by selecting the frequency point, the timeslot conversion point, and the scrambling code of the cell to be established in step 102, the femtocell continues to search for the neighboring cell of the cell to be established that conforms to the three selection methods, and adds the neighboring cell to the neighboring cell list of the cell to be established, thereby completing the planning of the neighboring cell of the cell to be established. And then, the home base station automatically establishes the cell and completes the establishment of the cell according to the planned cell to be established and the adjacent cell of the cell to be established.
Three options are selected as follows: the implementation processes of the mode of selecting the frequency point of the cell to be established, the mode of selecting the time slot switching point of the cell to be established and the mode of selecting the scrambling code of the cell to be established are specifically explained.
For the way of selecting the frequency point of the cell to be established, in step 102, planning the frequency point of the cell to be established specifically is:
and step 1021a, selecting n adjacent cells meeting the strongest signal strength from all the searched adjacent cells.
Step 1022a, obtaining the main frequency point information and the auxiliary frequency point information of n adjacent cells, and ordering according to the signal strength from large to small: f1, F2, F3..
And 1023a, acquiring and selecting frequency points in the frequency range which can be used by the current home base station, so that the frequency points of the selected cell to be established and all pilot frequencies of F1, F2 and F3..
It should be noted here that, a SIM card is embedded in the current femtocell in advance, a frequency range that can be used by the current femtocell is written in the SIM, and in this frequency range, the selected frequency point should be different in frequency from the frequency point in step 1022a, and it is ensured that all frequency points, including the main frequency point and the auxiliary frequency point, are different in frequency. The reason for this is that, in general, to avoid interference, the frequencies of the outdoor macro base station and the indoor home base station should be pilot frequencies, and at this time, it is most important to prevent pilot frequencies from being guaranteed as much as possible between the home base stations so as to avoid interference caused by the same selected frequency point.
Here, when the frequency point of the selected cell to be established cannot reach the pilot frequency of all F1, F2, F3.. And enabling the frequency point of the selected cell to be established to be consistent with the frequency point of the cell with the minimum signal intensity, namely consistent with Fn. The second solution is: and secondly, the secondary frequency point is not considered, and only the main frequency point is ensured to be pilot frequency.
For the second solution, step 1023a further includes:
step 1024a, acquiring the searched main frequency point information of all the adjacent cells, and sequencing the main frequency point information according to the signal intensity from big to small as follows: f1, f2, f3..
And 1025a, acquiring and selecting frequency points in the frequency range which can be used by all the femtocell, so that the frequency points of the selected cell to be established and all the pilot frequencies of f1, f2 and f3..
It should be noted here that, a SIM card is embedded in other home base stations in advance, and a frequency range that can be used by the home base station is written in the SIM card, and in this frequency range, the selected frequency point should be different from the frequency point in step 1025 a. And when the frequency point of the selected cell to be established can not reach all the pilot frequencies of f1, f2 and f3..
For the method of selecting the timeslot switching point of the cell to be established, in step 102, planning the timeslot switching point of the cell to be established specifically includes:
step 1021b, acquiring and selecting time slot conversion points based on the searched time slot conversion point information of all the adjacent cells, so that the time slot conversion points of the selected cell to be established are consistent with the time slot conversion points of the adjacent cells of the cell to be established.
Here, when the timeslot transition points of the cells adjacent to the cell to be established are not completely consistent, that is, the timeslot transition point of the selected cell to be established is not consistent with the timeslot transition points of the cells adjacent to the cell to be established, the method further includes, after step 1021 b: and the time slot conversion point of the selected cell to be established is consistent with the time slot conversion point of the adjacent cell with the same frequency as the cell to be established.
It should be noted that, in summary, it is preferable that the timeslot transition points of the neighboring cells are the same, since the timeslot transition points are different and there is interference. The same time slot conversion point can not be ensured when the cell planning is carried out because the original system information does not have the time slot conversion point information, therefore, the invention plans based on the time slot conversion point information added in the system information, and can reduce the interference. Then, after the time slot switching point is searched by the home base station, the time slot switching point of the selected cell to be established needs to be consistent with the time slot switching point of the adjacent cell with the same frequency as the cell to be established. The reason for this is that the interference can be minimized only if the time slot transition point of the cell to be established is consistent with the time slot transition point of the neighboring cell with the same frequency as the cell to be established. When the time slot conversion points of the adjacent cells of the cell to be established are not completely consistent, namely the time slot conversion point of the selected cell to be established cannot reach the time slot conversion point of the adjacent cell of the cell to be established, the time slot conversion point of the selected cell to be established is preferably ensured to be consistent with the time slot conversion point of the same-frequency adjacent cell of the cell to be established. The reason for this is that the interference between the cells with the same frequency is the largest, and the largest interference can be eliminated by ensuring that the time slot switching points of the cells with the same frequency are consistent.
For the mode of selecting the scrambling code of the cell to be established, the femtocell reads the scrambling code information of the adjacent cell from the system information, analyzes the scrambling code information and the frequency together, and selects the scrambling code of the cell to be established to plan the scrambling code of the cell to be established. In step 102, the specifically planning the scrambling code of the cell to be established is: when the frequency point of the cell to be established and the frequency point of the adjacent cell of the cell to be established are completely different in frequency, the selection and distribution of the scrambling codes are not limited; and when the frequency point of the cell to be established is the same frequency as the frequency point of the adjacent cell of the cell to be established, the scrambling code of the selected cell to be established is orthogonal to the scrambling code of the same-frequency adjacent cell, and the scrambling code orthogonal to the scrambling code of the same-frequency adjacent cell is distributed to the selected cell to be established after table look-up.
In summary, after the planning of the cell to be established is completed in the manner of selecting the frequency point of the cell to be established, the manner of selecting the time slot transition point of the cell to be established, and the manner of selecting the scrambling code of the cell to be established, the hnb continues to search for the neighboring cells of the cell to be established that conform to the three selection manners, and adds the neighboring cells to the neighboring cell list of the cell to be established, so as to meet the subsequent mobility requirement. And selecting frequency points, time slot conversion points and scrambling codes of the cell to be established and the adjacent cells of the home base station, and automatically establishing the cell and completing the establishment of the cell by the home base station according to the planned cell to be established and the adjacent cells of the cell to be established after the cell to be established and the adjacent cells are planned.
A system for reducing interference, the system comprising: a setting unit and a reading and planning unit. The setting unit is used for setting the auxiliary frequency point information in the system information in advance. The reading and planning unit is used for reading from the setting unit and selecting the frequency point based on the main frequency point information and the auxiliary frequency point information in the system information of the adjacent cell to plan the frequency point of the cell to be established.
Wherein, the setting unit is further configured to set the timeslot conversion point information in the system information in advance. The reading and planning unit is further used for reading from the setting unit and selecting the time slot conversion point based on the time slot conversion point information in the system information of the adjacent cell to plan the time slot conversion point of the cell to be established. Furthermore, the reading and planning unit is also used for reading from the setting unit and selecting the scrambling code based on the scrambling code information in all the searched neighbor cell system information to plan the scrambling code of the cell to be established.
Here, for the reading and programming unit, the reading and programming unit includes: the frequency point planning module of the cell to be established is used for selecting n adjacent cells meeting the strongest signal intensity in all the searched adjacent cells; acquiring main frequency point information and auxiliary frequency point information of n adjacent cells, and sequencing the main frequency point information and the auxiliary frequency point information from large to small according to signal intensity: f1, F2, F3... Fn; and acquiring and selecting a frequency point in a frequency range which can be used by the current home base station, so that the frequency point of the selected cell to be established is different from all the pilot frequencies of F1, F2 and F3..
When the frequency points of the selected cell to be established cannot reach all the pilot frequencies of the F1, F2, and F F3.. And the frequency point planning module of the cell to be established is further used for enabling the frequency point of the selected cell to be established to be consistent with the Fn. The other solution is as follows: the frequency point planning module of the cell to be established is further used for acquiring the main frequency point information of all the searched adjacent cells, and the main frequency point information is sequenced from large to small according to the signal intensity as follows: f1, f2, f3... fm, and m is an integer greater than n; and acquiring and selecting frequency points in the frequency range which can be used by all the femtocell base stations, so that the frequency points of the selected cell to be established and all the different frequencies of the f1, the f2 and the f f3.. And when the frequency point of the selected cell to be established cannot reach all the different frequencies of f1, f2 and f3..
Here, for the reading and programming unit, the reading and programming unit includes: and the planning module of the time slot conversion point of the cell to be established is used for acquiring and selecting the time slot conversion point based on the searched time slot conversion point information of all the adjacent cells, so that the time slot conversion point of the selected cell to be established is consistent with the time slot conversion point of the adjacent cell of the cell to be established.
When the time slot conversion points of the adjacent cells of the cell to be established are not completely consistent, the time slot conversion point planning module of the cell to be established is further used for enabling the time slot conversion point of the selected cell to be established to be consistent with the time slot conversion point of the adjacent cell with the same frequency as the cell to be established.
Here, for the reading and programming unit, the reading and programming unit includes: and the scrambling code planning module is used for enabling the scrambling codes of the selected cell to be established to be orthogonal to the scrambling codes of the same-frequency adjacent cells when the frequency point of the cell to be established is the same frequency as the frequency points of the adjacent cells of the cell to be established.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (17)
1. A method for reducing interference, the method comprising the steps of:
A. auxiliary frequency point information is set in system information in advance;
B. the femtocell searches for the adjacent cell, reads and selects frequency points based on the main frequency point information and the auxiliary frequency point information in the system information of the adjacent cell to plan the frequency points of the cell to be established,
in step B, the planning of the frequency points of the cell to be established specifically includes:
b11, selecting n adjacent cells meeting the strongest signal intensity from all the searched adjacent cells;
b12, acquiring the main frequency point information and the auxiliary frequency point information of the n adjacent cells, and sequencing according to the signal intensity from big to small: f1, F2, F3... Fn;
and B13, acquiring and selecting frequency points in the frequency range which can be used by the current home base station, so that the frequency points of the selected cell to be established are all pilot frequencies of F1, F2 and F F3..
2. The method of claim 1, wherein step a further comprises setting timeslot conversion point information in the system information in advance; and step B, reading and selecting the time slot conversion point based on the time slot conversion point information in the system information of the adjacent cell to plan the time slot conversion point of the cell to be established.
3. The method of claim 1, wherein when the frequency point of the selected cell to be established cannot reach all the different frequencies of the F1, F2, F3... Fn, the frequency point of the selected cell to be established is made to be consistent with Fn;
alternatively, step B13 is followed by:
b14, acquiring the searched main frequency point information of all adjacent cells, and sequencing the main frequency point information according to the signal intensity from big to small as follows: f1, f2, f3... fm, and m is an integer greater than n;
and B15, acquiring and selecting frequency points in the frequency range which can be used by all the femtocell, so that the frequency points of the selected cell to be established and all the pilot frequencies of the f1, the f2 and the f f3..
4. The method of claim 3, wherein the frequency point of the selected cell to be established is made to coincide with fm when the frequency point of the selected cell to be established cannot reach all the different frequencies from f1, f2, f3..
5. The method according to claim 3 or 4, wherein in step B, the planning of the timeslot transition point of the cell to be established is specifically:
and B21, acquiring and selecting time slot conversion points based on the searched time slot conversion point information of all the adjacent cells, so that the time slot conversion points of the selected cell to be established are consistent with the time slot conversion points of the adjacent cells of the cell to be established.
6. The method according to claim 5, wherein when the timeslot transition points of the neighbor cells of the cell to be established are not completely consistent, B21 is followed by:
and B22, making the time slot switching point of the selected cell to be established consistent with the time slot switching point of the adjacent cell with the same frequency of the cell to be established.
7. The method of claim 6, further comprising, after step B22: and acquiring and selecting a scrambling code based on scrambling code information in all searched system information of the adjacent cells to plan the scrambling code of the cell to be established.
8. The method according to claim 7, wherein the planning of the scrambling code of the cell to be established is specifically: and when the frequency point of the cell to be established is the same frequency as the frequency point of the adjacent cell of the cell to be established, enabling the scrambling code of the selected cell to be established to be orthogonal to the scrambling code of the adjacent cell with the same frequency.
9. The method according to claim 8, wherein after the planning of the cell to be established is completed in the manner of selecting the frequency point, the time slot transition point and the scrambling code of the cell to be established, the femtocell continues to search for the neighbor cell of the cell to be established that conforms to the selected manner, and adds the neighbor cell to the neighbor cell list of the cell to be established, thereby completing the planning of the neighbor cell of the cell to be established.
10. A system for reducing interference, the system comprising: a setting unit and a reading and planning unit; wherein,
the setting unit is used for setting auxiliary frequency point information in the system information in advance;
a reading and planning unit for reading from the setting unit and selecting frequency points based on the main frequency point information and the auxiliary frequency point information in the system information of the neighboring cells to plan the frequency points of the cells to be established,
wherein the reading and planning unit is further configured to read from the setting unit and select a scrambling code based on scrambling code information in all searched neighbor cell system information to plan a scrambling code of a cell to be established,
and wherein the read and program unit comprises: the frequency point planning module of the cell to be established is used for selecting n adjacent cells meeting the strongest signal intensity in all the searched adjacent cells; acquiring the main frequency point information and the auxiliary frequency point information of the n adjacent cells, and sequencing the main frequency point information and the auxiliary frequency point information according to the signal intensity from big to small: f1, F2, F3... Fn; and acquiring and selecting a frequency point in a frequency range which can be used by the current home base station, so that the frequency point of the selected cell to be established is different from all the pilot frequencies of F1, F2 and F3..
11. The system according to claim 10, wherein the setting unit is further configured to set timeslot conversion point information in system information in advance; the reading and planning unit is further configured to read from the setting unit and select a timeslot conversion point based on timeslot conversion point information in the system information of the neighboring cell to plan the timeslot conversion point of the cell to be established.
12. The system of claim 10, wherein the frequency point planning module of the cell to be established is further configured to make the frequency point of the selected cell to be established coincide with Fn when the frequency point of the selected cell to be established cannot reach all the different frequencies from F1, F2, F3..
13. The system of claim 10, wherein when the frequency point of the selected cell to be established cannot reach all different frequencies from F1, F2, F3.. f1, f2, f3... fm, and m is an integer greater than n; and acquiring and selecting frequency points in the frequency range which can be used by all the femtocell base stations, so that the frequency points of the selected cell to be established and all the different frequencies of the f1, the f2 and the f f3..
14. The system of claim 13, wherein the frequency point planning module of the cell to be established is further configured to make the frequency point of the selected cell to be established coincide with fm when the frequency point of the selected cell to be established cannot reach all the different frequencies from f1, f2, f3..
15. The system of claim 10, wherein the reading and planning unit comprises: and the planning module of the time slot conversion point of the cell to be established is used for acquiring and selecting the time slot conversion point based on the searched time slot conversion point information of all the adjacent cells so as to ensure that the time slot conversion point of the selected cell to be established is consistent with the time slot conversion point of the adjacent cell of the cell to be established.
16. The system according to claim 15, wherein when the timeslot conversion points of the neighboring cells of the cell to be established are not completely consistent, the timeslot conversion point planning module of the cell to be established is further configured to make the timeslot conversion point of the selected cell to be established consistent with the timeslot conversion point of the neighboring cell of the cell to be established with the same frequency.
17. The system of claim 10, wherein the reading and planning unit comprises: and the scrambling code planning module is used for enabling the scrambling codes of the selected cell to be established to be orthogonal to the scrambling codes of the same-frequency adjacent cells when the frequency points of the cell to be established and the frequency points of the adjacent cells of the cell to be established have the same frequency.
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| CN101969645B (en) * | 2009-07-27 | 2013-09-11 | 华为技术有限公司 | Interference treatment method and home base station |
| CN102238660B (en) * | 2010-04-30 | 2013-08-14 | 鼎桥通信技术有限公司 | Cell reselection method |
| CN102244870B (en) * | 2010-05-15 | 2014-09-10 | 中兴通讯股份有限公司 | Method and system for configuring Femto frequencies |
| CN102065461B (en) * | 2011-01-19 | 2013-07-31 | 上海大唐移动通信设备有限公司 | Home base station information configuring and processing method and device |
| CN104869614B (en) * | 2014-02-26 | 2018-09-14 | 普天信息技术有限公司 | A kind of processing method of current sector frequency point information |
| CN103813347B (en) | 2014-02-28 | 2018-01-26 | 电信科学技术研究院 | A kind of base station frequency resource allocation method and the network equipment |
| CN104053159B (en) * | 2014-06-19 | 2018-02-27 | 京信通信系统（中国）有限公司 | The frequency collocation method and device of a kind of Multi-Carrier basestation |
| CN107396287B (en) * | 2017-07-14 | 2020-10-20 | 深圳市盛路物联通讯技术有限公司 | Method and device for selecting working frequency points |
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