CN104753560B - A kind of anti-arrowband interference method, eNodeB and communication system - Google Patents

Abstract

The invention relates to the communication field, and discloses an anti-narrowband interference method, eNodeB and a communication system, which can resist the interference of the narrowband interference on a synchronous channel and a PBCH channel. The anti-narrowband interference method includes: when the interference frequency band where the narrowband intermediate frequency point is located overlaps with the center frequency band of the cell, searching for a new center frequency band of the cell in the frequency band of the cell, wherein the center frequency band of the cell is where the radio link resource RB of the cell is located frequency band; generate synchronization information according to the center frequency point of the new cell center frequency band; and send the synchronization information to the terminal for the terminal to perform synchronization according to the synchronization information. The anti-narrowband interference method is used for synchronous channel and PBCH channel to resist narrowband interference.

Description

An anti-narrowband interference method, eNodeB and communication system

technical field

The present invention relates to the communication field, in particular to an anti-narrowband interference method, eNodeB (Evolved Node B, evolved base station) and a communication system.

Background technique

The LTE (Long Term Evolution, long-term evolution) technology utilizes a large bandwidth and cooperates with a very high spectrum utilization rate, so that the advantage of LTE in terms of service rate is very obvious. The LTE technology includes two duplex modes of TDD (Time Division Duplexing, time division duplexing) and FDD (Frequency Division Duplexing, frequency division duplexing), which are denoted as TDD-LTE and FDD-LTE respectively.

The cell in the LTE communication system has a bandwidth ranging from 1.4M to 20M. The synchronization channel of the cell and the PBCH (Physics Broadcast Channel, Physical Broadcast Channel) are collectively mapped to the 6 RB (Radio Bear, wireless) in the center of the bandwidth occupied by the cell. Link bearing) resources, the corresponding frequency band position is (FC _-0.54MHz ～FC + _0.54MHz ). Generally, for a broadband system, if there is narrowband interference around the broadband, some narrowbands with interference cannot carry services normally, resulting in performance degradation of the entire system. The LTE technology overcomes the narrowband interference by dynamically adjusting the resources allocated for the uplink and downlink services. However, when the narrowband interference is just at the center frequency point of the LTE cell, the synchronization channel and PBCH may be interfered. Because the synchronization channel and PBCH cannot overcome the narrowband interference through dynamic adjustment like the traffic channel, when the synchronization channel and PBCH are interfered, it will cause the terminal to fail to complete the synchronization of the cell and eventually all the terminals will be on the cell Unable to access. When the cell A is a neighboring cell of a certain cell B, the cell B cannot recognize the cell A because the cell A and the cell B cannot be synchronized, and the surrounding terminals are in the process of moving, and the network cannot allow the terminal to switch to the cell A come up. If the network is TDD-LTE with co-frequency networking, the narrowband interference at the center frequency will affect the entire LTE network. Therefore, the anti-narrowband interference technology in the prior art has limitations, and cannot resist the interference of the narrowband interference on the synchronization channel and the PBCH channel.

Contents of the invention

The purpose of the present invention is to provide an anti-narrowband interference method, eNodeB and communication system, which can resist the interference of the narrowband interference on the synchronization channel and the PBCH channel.

In order to solve the above technical problems, the embodiment of the present invention provides an anti-narrowband interference method, which is applied to the evolved base station eNodeB, including:

When the interference frequency band where the narrowband interference is located intersects with the cell center frequency band, search for a new cell center frequency band in the cell frequency band, wherein the cell center frequency band is the frequency band where the radio link resource RB of the cell is located;

generating synchronization information according to the center frequency point of the new cell center frequency band;

Sending the synchronization information to the terminal for the terminal to perform synchronization according to the synchronization information.

An embodiment of the present invention provides an eNodeB, including:

A search unit, configured to search for a new cell center frequency band in the cell frequency band when the interference frequency band where the narrowband interference is located intersects with the cell center frequency band, where the cell center frequency band is the frequency band where the radio link resource RB of the cell is located;

a processing unit, configured to generate synchronization information according to the center frequency point of the new cell center frequency band;

The sending unit is configured to send the synchronization information to the terminal for the terminal to perform synchronization according to the synchronization information.

Embodiments of the present invention also provide an anti-narrowband interference method applied to a terminal, including:

receiving the synchronization information sent by the evolved base station eNodeB;

According to the synchronization signal and ΔF _C in the synchronization information, calculate the center frequency point of the cell frequency band; wherein, the ΔF _C is the frequency offset between the center frequency point of the cell center frequency band and the center frequency point of the cell frequency band amount, the center frequency band of the cell is the frequency band where the radio link resource RB of the cell is located;

Use the central frequency point of the frequency band of the cell to process services.

Embodiments of the present invention also provide a terminal, including:

a receiving unit, configured to receive synchronization information sent by the evolved base station eNodeB;

A calculation unit, configured to calculate the center frequency point of the cell frequency band according to the synchronization signal and ΔF _C in the synchronization information; wherein, the ΔF _C is the difference between the center frequency point of the cell center frequency band and the center frequency point of the cell frequency band The frequency offset between, the center frequency band of the cell is the frequency band where the radio link resource RB of the cell is located;

The processing unit is configured to use the central frequency point of the frequency band of the cell to process services.

The present invention also provides a communication system, including:

The above-mentioned eNodeB and the above-mentioned terminal.

Compared with the prior art, the embodiments of the present invention, when the narrowband interference affects the center frequency band of the cell where the synchronization signal is located, a new section of the center frequency band of the cell is searched in the frequency band of the cell, and according to the center frequency point of the new center frequency band of the cell Generate synchronization information; send the synchronization information to the terminal for the terminal to perform synchronization according to the center frequency point of the new center frequency band of the cell without narrowband interference in the synchronization information. The method can resist the interference of the synchronization channel and the PBCH channel.

In addition, before the search for a new cell center frequency band in the cell frequency band, the method further includes:

Compare the signal strength of the narrowband intermediate frequency point with the preset interference threshold;

When the signal strength of consecutive N frequency points in the narrowband is greater than the preset interference threshold, the frequency band formed by the N frequency points is used as the interference frequency band, where N is an integer greater than or equal to 2, so The interference frequency band mentioned above is the interference frequency band where the narrowband interference is located.

The interference frequency band can be obtained by comparing the signal strength of the narrow-band intermediate frequency point with the preset interference threshold.

In addition, the searching for a new cell center frequency band in the cell frequency band specifically includes the following steps: a. Within the range of the cell frequency band, search for a set of non-interference frequency bands. Composed of multiple non-interference frequency bands; b. Find the first non-interference frequency band with a bandwidth greater than the wireless link carrying bandwidth BW _6RB in the set of non-interference frequency bands; c. Find the center frequency point F _{C_NEW} of the first non-interference frequency band , the F _{C_NEW} =F _C +M*100, the M is an integer satisfying 75>(M*100)%90>15.

Through searching, the first non-interference frequency band whose bandwidth is greater than BW _6RB and whose center frequency F _{C_NEW} satisfies F _{C_NEW} =F _C +M*100 is taken as the new cell center frequency band, and the new cell center frequency band is used for synchronization signals and PBCH propagation of the signal.

In addition, the generating synchronization information according to the center frequency point of the new cell center frequency band includes: generating a synchronization signal according to the center frequency point of the new cell center frequency band; generating a synchronization signal according to the center frequency point of the new cell center frequency band Management information block MIB, calculate △F _C according to the padding byte spare in the MIB, and the △ _FC is the frequency between the center frequency point of the new cell center frequency band and the center frequency point of the new cell frequency band Offset.

Synchronization signal and MIB are generated by using the center frequency point F _{C_NEW} of the new cell center frequency band, and ΔF _C is obtained according to the spare in the MIB.

In addition, in the spare, the 0th bit is a sign bit, the 1st bit to 7th bit are data bits, and the 8th bit and 9th bit are reserved bits.

By defining 10 bits of spare, the 1st bit to 7th bit of spare are used as data bits to obtain △F _C .

In addition, the method further includes: adding the _{FC_NEW} into the neighbor cell list of the cell managed by the eNodeB. This enables terminals in other cells to measure the interfered cell through neighboring cell measurements.

Description of drawings

Fig. 1 is a schematic flow chart of the anti-narrowband interference method in the first embodiment of the present invention;

FIG. 2 is a schematic diagram of spectrum and narrowband interference of an LTE cell according to the first embodiment of the present invention;

3 is a schematic flow diagram of a method for finding a new cell center frequency band according to the first embodiment of the present invention;

Fig. 4 is a schematic flow chart of the anti-narrowband interference method according to the second embodiment of the present invention;

Fig. 5 is a schematic flowchart of a method for resisting narrowband interference according to a third embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

The first embodiment of the present invention provides an anti-narrowband interference method, which is applied to eNodeB. The anti-narrowband interference method can solve the problem that the LTE cell cannot be used when the synchronization signal and PBCH of the LTE cell are submerged by the narrowband interference. As shown in Figure 1, the anti-narrowband interference method includes the following steps:

101. Acquire an interference frequency band in a cell frequency band.

As shown in FIG. 2 , FIG. 2 is a schematic diagram of the frequency spectrum and narrowband interference of a cell, the horizontal axis represents the frequency f used by the cell, and the vertical axis represents the signal strength of each frequency point. Assume that the frequency band where the LTE cell works is the cell frequency band, which is denoted as (F ₁ ~ F ₂ ). The cell frequency band takes F _C as the center frequency point and BW as the bandwidth. In the LTE network, the eNodeB will always measure the network quality. The threshold R in the figure is a preset interference threshold. When the system measures narrowband interference in the frequency band of the cell, compare the signal strength of the narrowband intermediate frequency points with the preset interference threshold. The signal strengths of the narrowband interference m1, m2, and m3 intermediate frequency points are S1, S3, and S2, which are greater than Threshold R, the threshold R can divide the cell frequency band into multiple interference frequency bands and multiple non-interference frequency bands. When the signal strength of N continuous frequency points in the narrowband is greater than the preset interference threshold, the frequency band formed by N frequency points is used as the interference frequency band, and the interference frequency band is the interference frequency band where the narrowband interference is located, and the N is An integer greater than or equal to 2. The multiple interference frequency bands correspond to the frequency points whose signal strength of the narrowband frequency point is greater than the preset interference threshold, and the multiple non-interference frequency bands correspond to the frequency points whose signal strength of the narrowband frequency point is less than or equal to the preset interference threshold frequency band or a frequency band without narrowband interference in the cell frequency band. In FIG. 2 , the frequency bands where m1 , m2 and m3 are located are interference frequency bands of the LTE cell, and n1 , n2 , n3 and n4 are non-interference frequency bands.

When the signal strength of the narrowband intermediate frequency point is less than or equal to the preset interference threshold, it is considered that the impact of the interference at this frequency point is very small, and the impact of the interference on cell communication may not be considered.

102. Determine whether the interference frequency band where the narrowband interference is located overlaps with the cell center frequency band.

The center frequency band of the cell may be the frequency band where the six radio link resource RBs of the cell are located. Generally, the center frequency band of the cell is (FC −0.54 _{MHz˜FC +0.54} MHz). Compare the interference frequency band where the narrowband interference is located with the center frequency band of the cell, and determine whether the interference frequency bands m1, m2, and m3 where the narrowband interference is located overlap with the center frequency band of the cell (FC _-0.54MHz ～FC + _0.54MHz ). When the interference frequency band where the narrowband intermediate frequency point is located overlaps with the cell center frequency band, step 103 is performed. Assuming that m2 and m3 intersect with the center frequency band of the cell, the task narrowband interference has flooded the synchronization signal and PBCH of the LTE cell.

103. When the interference frequency band where the narrowband intermediate frequency point is located overlaps with the cell center frequency band, search for a new cell center frequency band in the cell frequency band.

The new cell center frequency band is a frequency band that has no intersection with the interference frequency band.

As shown in Figure 3, the step 103 specifically includes the following sub-steps:

1031. Within the frequency range of the cell, search for a set of non-interference frequency bands that do not overlap with the interference frequency band.

That is, the multiple non-interference frequency bands n1 , n2 , n3 and n4 obtained in step 101 are searched, and the multiple non-interference frequency bands form a set of non-interference frequency bands ( _{FAVAILABLE_LOW_N ˜FAVAILABLE_HIGH_N} ). The multiple non-interference frequency bands in the set of non-interference frequency bands may be expressed as {(F _{available_low_1 ˜F available_high_1} ), (F _{available_low_2 ˜F available_high_2} ), . . . , (F _{available_low_n ˜F available_high_n} )}.

1032. Search for a first non-interference frequency band with a bandwidth greater than the radio link bearer bandwidth BW _6RB in the non-interference frequency band set.

First obtain the bandwidth of each interference frequency band in a plurality of non-interference frequency band sets, the method of obtaining the bandwidth of each interference frequency band in a plurality of interference-free frequency band sets is to seek the difference between the highest frequency and the lowest frequency in each interference-free frequency band, for example, no The bandwidth of the interference frequency band BW _{AVAILABLE_N} = (F _{AVAILABLE_HIGH_N} - F _{AVAILABLE_LOW_N} ).

Then compare the bandwidth of the wireless link BW _6RB with the bandwidths of multiple non-interference frequency bands, and find out the non-interference frequency band with a bandwidth larger than BW _6RB . The interference-free frequency band with a bandwidth larger than BW _6RB is called the first interference-free frequency band. There may be multiple first interference-free frequency bands.

1033. Search for a center frequency point F _{C_NEW} of a new cell center frequency band in the first interference-free frequency band.

Find the center frequency point F _{C_NEW} of the new cell center frequency band within the range of {(FAVAILABLE_LOW_N +BW _6RB /2) ~ (F _{AVAILABLE_HIGH_N -BW 6RB} /2)} of the first interference-free frequency band, that is, _{FC_NEW} is 6 cells The new center frequency point of the frequency band where the RB is located. At the same time, the _{FC_NEW} also satisfies _{FC_NEW} = ₍ FC+M*100), wherein _FC is the center frequency point of the frequency band of the cell, and M is an integer satisfying 75>(M*100)%90>15. There can be multiple _{FC_NEWs} , and one _{FC_NEW} can be selected for use in actual applications.

104. Generate synchronization information according to the center frequency point of the new cell center frequency band.

Step 104 includes: generating a synchronization signal according to the _{FC_NEW} .

After finding the _{FC_NEW} , based on this _{FC_NEW} , the PSS (Primary synchronization sequence, primary synchronization sequence) and SSS (Auxiliary synchronization sequence, secondary synchronization sequence) signals are propagated at the same time, based on the synchronization signal generated by _{FC_NEW} and _propagated on the FC The synchronization signals are exactly the same.

Step 104 further includes: generating a management information block MIB according to _{FC_NEW} , and calculating _ΔFC according to the spare byte in the MIB, where _ΔFC is the frequency offset between _{FC_NEW} and the new center frequency point in the cell frequency band.

When generating the synchronization signal, MIB (Master Information Block, management information block) will be regenerated based on _{FC_NEW} at the same time, and the MIB will be propagated on the PBCH channel corresponding to _{FC_NEW} , and the regenerated MIB information will be recorded as _{MIB_FC_NEW} information. MIB information propagated on _C is recorded as _{MIB_FC} , _{MIB_FC_NEW} and _{MIB_FC} are different. MIB information includes 4 kinds of information, namely dl-Bandwidth (bandwidth), phich-Config (physical channel configuration), systemFrameNumber (system frame number) and spare (stuffing bytes). Among them, the dl-Bandwidth, phich-Config and systemFrameNumber of _{MIB_FC_NEW} and _{MIB_FC} are the same, but the spare is different. Spare has a total of 10 bits, from bit 0 to bit 9. In _{MIB_FC} spare, all 10 bits of Spare are 0. In _{MIB_FC_NEW} spare, the 0th bit is the sign bit. 0 can be used to represent a positive number, and 1 can be used to represent a negative number. Bit 1 to bit 7 It is a data bit, which can be used to represent an 8-bit integer, indicating that the range of △ _FC is (-128~127), and the 8th and 9th bits are reserved bits.

105. Send the synchronization information to the terminal through the broadcast channel.

The eNodeB broadcasts on the PBCH channel, and the broadcast content is _{FC_NEW} and the synchronization signal generated by _{FC_NEW} and △FC for the terminal to use _{FC_NEW} , the new synchronization signal and _{△ FC} for synchronization.

Compared with the prior art, the embodiments of the present invention, when the narrowband interference affects the center frequency band of the cell where the synchronization signal is located, a new section of the center frequency band of the cell is searched in the frequency band of the cell, and according to the center frequency point of the new center frequency band of the cell generating synchronization information; sending the synchronization information to the terminal for the terminal to perform synchronization according to the synchronization information. The method can resist the interference of the synchronization channel and the PBCH channel.

The second embodiment of the present invention provides another method for resisting narrowband interference. The second embodiment is further improved on the basis of the first embodiment. As shown in FIG. 4, the main improvement is that: after step 105 is performed, the anti-narrowband interference method further includes step 106: adding _{FC_NEW} to the eNodeB In the neighbor cell list of the managed cell, let the cell managed by the eNodeB add this frequency point as a different frequency point to its neighbor cell list, so as to ensure that terminals in other cells can also measure the interfered cell through neighbor cell measurement.

In addition, it should be noted that after the above operations are completed, the eNodeB still needs to continuously detect surrounding narrowband interference conditions, and select a corresponding frequency band for communication according to changes in the narrowband interference conditions. The change of the narrowband interference situation can be divided into two cases: the first case is that when the narrowband interference on the _{FC disappears, the eNodeB will clear the synchronization signal, PBCH and reference signal generated according to the FC_NEW ,} and notify the eNodeB at the same time _{FC_NEW is} removed from the neighbor cell list of the cell managed by the eNodeB; in the second case, when the narrowband interference on _FC changes again, _{FC_NEW} is preferentially selected, and if _{FC_NEW} is also blocked at this time interference, it is necessary to re-evaluate according to the anti-narrowband interference method described in this embodiment, and search for a new available center frequency point in the frequency band of the cell.

The third embodiment of the present invention provides an anti-narrowband interference method, as shown in FIG. 5, which is applied to a terminal and includes the following steps:

501. Receive synchronization information sent by the eNodeB.

The synchronization information includes a synchronization signal and _ΔFC , and the synchronization signal includes _{FC or FC_NEW .}

502. Calculate the center frequency point of the cell frequency band according to the synchronization signal in the synchronization information and △F _C ; where △F _C is the frequency offset between the center frequency point of the cell center frequency band and the center frequency point of the cell frequency band, The central frequency band of the cell is the frequency band where the radio link resources RB of the cell are located.

Steps 501 and 502 specifically include: when the terminal starts to search the network, it first accesses the frequency point F _{C_receive} . When there is no narrowband interference, the F _{C_receive} can be F _C . When there is narrowband interference, the F C_receive _{C_receive} can be the center frequency point F _{C_NEW} of the new cell center frequency band to be searched, and then the synchronization signal is found on the frequency point F _{C_receive} , and the MIB information carried by the PBCH is read out. The MIB information includes △F _C , and then you can Calculate the central frequency point F _{C_end} of the new cell frequency band by combining the current F _{C_receive} and the parsed spare. The method is: F _{C_end} =F _{C_receive} +ΔF _C .

503. Use the central frequency point of the frequency band of the cell to process the service.

After determining the center frequency point F _{C_end} , the terminal switches to the corresponding center frequency point to perform subsequent SIB (System information block, system information block) reception and subsequent service processes.

The terminal performs synchronization according to the new synchronization information without narrow-band interference and the center frequency point of the new cell center frequency band, and resists the interference of the synchronization channel and the PBCH channel.

A fourth embodiment of the present invention provides an eNodeB, including:

A search unit, configured to search for a new cell center frequency band in the cell frequency band when the interference frequency band where the narrowband interference is located overlaps with the cell center frequency band, where the cell center frequency band is the frequency band where the radio link resource RB of the cell is located.

A processing unit, configured to generate synchronization information according to the center frequency point of the new cell center frequency band.

The sending unit is configured to send the synchronization information to the terminal for the terminal to perform synchronization according to the synchronization information.

Further, the search unit is specifically used to: a. search for a set of non-interference frequency bands within the frequency range of the cell, the set of non-interference frequency bands is composed of a plurality of non-interference frequency bands that do not overlap with the interference frequency bands; b. . Find the first non-interference frequency band with a bandwidth greater than the wireless link carrying bandwidth BW _6RB in the set of non-interference frequency bands; c. Find the center frequency point F _{C_NEW} of the first non-interference frequency band, and the F _{C_NEW} = F _C +M*100, the M is an integer satisfying 75>(M*100)%90>15.

The sending unit is specifically configured to: send the synchronization signal and the ΔF _C to the terminal through a broadcast channel, so that the terminal can calculate the center frequency of the new cell frequency band according to the synchronization signal and the ΔF _C point, and perform synchronization according to the central frequency point of the new cell frequency band.

Compared with the prior art, the embodiment of the present invention, when the narrowband interference affects the frequency band of the center of the cell where the synchronization signal is located, the search unit searches for a new frequency band of the center of the cell in the frequency band of the cell, and the processing unit searches for a new frequency band of the center of the cell according to the Synchronization information is generated at the central frequency point of the terminal; the sending unit sends the synchronization information to the terminal for the terminal to perform synchronization according to the synchronization information. The eNodeB can resist the narrowband interference of the synchronization channel and the PBCH channel.

The fifth embodiment of the present invention provides another eNodeB. The fifth embodiment is further improved on the basis of the fourth embodiment, and the main improvement is that: in the fifth embodiment of the present invention, the eNodeB further includes: a comparison unit, configured to determine whether the search unit is in the cell frequency band Before finding a new cell center frequency band, compare the signal strength of the narrowband mid-frequency point with the size of the preset interference threshold; a definition unit is used when the signal strength of consecutive N frequency points in the narrowband is greater than the preset interference threshold , using the frequency band formed by the N frequency points as the interference frequency band, where N is an integer greater than or equal to 2. In this way, the comparison unit compares the signal strength of the narrow-band intermediate frequency point with the size of the preset interference threshold, so that the definition unit can define the interference frequency band.

The sixth embodiment of the present invention provides another eNodeB. The sixth embodiment is further improved on the basis of the fifth embodiment, and the main improvement is that: in the sixth embodiment of the present invention, the eNodeB further includes: a first generation unit, configured to The center frequency point of the frequency band generates a synchronization signal; the second generating unit is configured to generate a management information block MIB according to the center frequency point of the new cell center frequency band, and calculate _ΔFC according to the fill byte spare in the MIB, and the The above ΔF _C is the frequency offset between the center frequency point of the new cell center frequency band and the center frequency point of the new cell frequency band. In the spare, bit 0 is a sign bit, bit 1 to bit 7 are data bits, bit 8 and bit 9 are reserved bits. In this way, the first generation unit and the second generation unit respectively generate the synchronization signal and the MIB by using the center frequency _{F C_NEW} of the new cell center frequency band, and obtain ΔFC according to the spare byte in the MIB.

The seventh embodiment of the present invention provides another eNodeB. The seventh embodiment is further improved on the basis of the sixth embodiment. The main improvement is: in the seventh embodiment of the present invention, the eNodeB further includes: an adding unit, configured to add the _{FC_NEW} to the In the neighbor cell list of the cell managed by the eNodeB. In this way, terminals in other cells can also measure the interfered cell through neighboring cell measurement.

The eighth embodiment of the present invention provides a terminal, including:

The receiving unit is configured to receive synchronization information sent by the eNodeB.

The calculation unit is used to calculate the center frequency point of the frequency band of the cell according to the synchronization signal and △F _C in the synchronization information; where △F _C is the frequency offset between the center frequency point of the center frequency band of the cell and the center frequency point of the frequency band of the cell The shift amount, the center frequency band of the cell is the frequency band where the radio link resource RB of the cell is located.

The processing unit is configured to use the central frequency point of the cell frequency band to process services.

The terminal performs synchronization according to the new synchronization information without narrow-band interference and the center frequency point of the new cell center frequency band, and resists the interference of the synchronization channel and the PBCH channel.

A ninth embodiment of the present invention provides a communication system, including any eNodeB and terminal described above. Exemplarily, the communication system may be an LTE communication system.

It is worth mentioning that all the modules involved in this embodiment are logical modules. In practical applications, a logical unit can be a physical unit, or a part of a physical unit, or multiple physical units. Combination of units. For the working principle of each physical unit, reference may be made to the descriptions in the method embodiments, and the present invention will not repeat them here. In addition, in order to highlight the innovative part of the present invention, units that are not closely related to solving the technical problems proposed by the present invention are not introduced in this embodiment, but this does not mean that there are no other units in this embodiment.

Those of ordinary skill in the art can understand that the above-mentioned embodiments are specific examples for realizing the present invention, and in practical applications, various changes can be made to it in form and details without departing from the spirit and spirit of the present invention. scope.

Claims (17)

1. A kind of 1. anti-arrowband interference method, applied to evolution base station eNodeB, it is characterised in that including：

   When the interference band where arrowband interference has common factor with center of housing estate frequency range, found in cell frequency range in new cell Heart frequency range, wherein, the center of housing estate frequency range is the frequency range where the air-link resources RB of cell；

   Synchronizing information is generated according to the center frequency point of the new center of housing estate frequency range；

   The synchronizing information is sent to terminal, synchronized for terminal according to the synchronizing information；

   Wherein, the new center of housing estate frequency range is and frequency range of the interference band without common factor.
2. 2. anti-arrowband interference method according to claim 1, it is characterised in that it is described found in cell frequency range it is new small Before district center frequency range, methods described also includes：

   The narrow signal intensity with intermediate-frequeney point and the size of default interference threshold；

   When the signal intensity that continuous N number of frequency in the arrowband be present is more than default interference threshold, by N number of frequency shape Into frequency range as the interference band, the N is the integer more than or equal to 2, where the interference band is arrowband interference Interference band.
3. 3. anti-arrowband interference method according to claim 1, it is characterised in that it is described found in cell frequency range it is new small District center frequency range specifically includes following steps：

   A, in the cell band limits, search noiseless frequency range set, the noiseless frequency range set by with the interference Frequency range does not have the multiple noiseless frequency range compositions to occur simultaneously；

   B, band is searched in the noiseless frequency range set and is wider than Radio Link carrying bandwidth BW_6RBThe first noiseless frequency range；

   C, the center frequency point F of the first noiseless frequency range is found_{C_NEW}, the F_{C_NEW}=(F_C+ M*100), the M is satisfaction 75 >(M*100) %90>15 integer；

   Wherein, F_CFor the center frequency point of the cell frequency range.
4. 4. anti-arrowband interference method according to claim 1, it is characterised in that described according to the new center of housing estate The center frequency point generation synchronizing information of frequency range includes：

   Synchronizing signal is generated according to the center frequency point of the new center of housing estate frequency range；

   Management information block MIB, the filling word in the MIB are generated according to the center frequency point of the new center of housing estate frequency range Save spare and calculate △ F_C, the △ F_CFor the center frequency of the center frequency point and new cell frequency range of the new center of housing estate frequency range Frequency offset between point.
5. 5. anti-arrowband interference method according to claim 4, it is characterised in that described that the synchronizing information is sent to end End, synchronizes according to the synchronizing information for terminal and specifically includes：

   By the synchronizing signal and the △ F_CTerminal is sent to by broadcast channel, for terminal according to the synchronizing signal and institute State △ F_CThe center frequency point of the new cell frequency range is calculated, is carried out according to the center frequency point of the new cell frequency range same Step.
6. 6. anti-arrowband interference method according to claim 4, it is characterised in that

   In the spare, the 0th bit bit positions are sign bit, and 1bit positions to 7bit positions are data bit, 8bit positions and 9bit positions are reserved place.
7. 7. the method for anti-arrowband interference according to claim 3, it is characterised in that methods described also includes：

   By the F_{C_NEW}It is added in the Neighboring Cell List of the cell of the eNodeB management.
8. A kind of 8. anti-arrowband interference method, applied to terminal, it is characterised in that including：

   Receive the synchronizing information that evolution base station eNodeB is sent；

   Synchronizing signal and △ F in the synchronizing information_C, the center frequency point of calculating cell frequency range；Wherein, the △ F_CFor Frequency offset between the center frequency point of center of housing estate frequency range and the center frequency point of cell frequency range, the center of housing estate frequency range are Frequency range where the air-link resources RB of cell；

   Use the center frequency point processing business of the cell frequency range.
9. A kind of 9. evolution base station eNodeB, it is characterised in that including：

   Searching unit, when having common factor with center of housing estate frequency range for the interference band where being disturbed when arrowband, in cell frequency range New center of housing estate frequency range is found, wherein, the center of housing estate frequency range is the frequency range where the air-link resources RB of cell；

   Processing unit, for generating synchronizing information according to the center frequency point of the new center of housing estate frequency range；

   Transmitting element, for the synchronizing information to be sent into terminal, synchronized for terminal according to the synchronizing information；

   Wherein, the new center of housing estate frequency range is and frequency range of the interference band without common factor.
10. 10. eNodeB according to claim 9, it is characterised in that the eNodeB also includes：

    Comparing unit, for before finding new center of housing estate frequency range in cell frequency range in the searching unit, narrow band The signal intensity of intermediate-frequeney point and the size of default interference threshold；

    Definition unit, for when the signal intensity that continuous N number of frequency in the arrowband be present is more than default interference threshold, inciting somebody to action For the frequency range that N number of frequency is formed as the interference band, the N is the integer more than or equal to 2.
11. 11. eNodeB according to claim 9, it is characterised in that the searching unit is specifically used for：

    A, in the cell band limits, search noiseless frequency range set, the noiseless frequency range set by with the interference Frequency range does not have the multiple noiseless frequency range compositions to occur simultaneously；

    B, searching belt is wider than Radio Link carrying bandwidth BW in the noiseless frequency range set_6RBThe first noiseless frequency range；

    C, the center frequency point F of the first noiseless frequency range is found_{C_NEW}, the F_{C_NEW}=F_C+ M*100, the M are satisfaction 75> (M*100) %90>15 integer；

    Wherein, F_CFor the center frequency point of the cell frequency range.
12. 12. eNodeB according to claim 9, it is characterised in that the eNodeB also includes：

    First generation unit, for generating synchronizing signal according to the center frequency point of the new center of housing estate frequency range；

    Second generation unit, for generating management information block MIB according to the center frequency point of the new center of housing estate frequency range, according to Byte of padding spare in the MIB calculates △ F_C, the △ F_CFor the new center of housing estate frequency range center frequency point with it is new Cell frequency range center frequency point between frequency offset.
13. 13. eNodeB according to claim 12, it is characterised in that the transmitting element is specifically used for：

    By the synchronizing signal and the △ F_CTerminal is sent to by broadcast channel, for terminal according to the synchronizing signal and institute State △ F_CThe center frequency point of the new cell frequency range is calculated, and is carried out according to the center frequency point of the new cell frequency range It is synchronous.
14. 14. eNodeB according to claim 12, it is characterised in that

    In the spare, 0bit positions are sign bit, and 1bit positions to 7bit positions are data bit, 8bit positions and 9bit positions are reserved place.
15. 15. eNodeB according to claim 11, it is characterised in that the eNodeB also includes：

    Adding device, for by the F_{C_NEW}It is added in the Neighboring Cell List of the cell of the eNodeB management.
16. A kind of 16. terminal, it is characterised in that including：

    Receiving unit, for receiving the synchronizing information of evolution base station eNodeB transmissions；

    Computing unit, for the synchronizing signal in the synchronizing information and △ F_C, the center frequency point of calculating cell frequency range；Its In, the △ F_CCenter frequency point for center of housing estate frequency range and the frequency offset between the center frequency point of cell frequency range, it is described Center of housing estate frequency range is the frequency range where the air-link resources RB of cell；

    Processing unit, for the center frequency point processing business using the cell frequency range.
17. A kind of 17. communication system, it is characterised in that including：

    The terminal described in eNodeB and claim 16 described in claim 9 to 15 is any.