CN104581649A - LTE trunking system frequency band selection method and device - Google Patents

Abstract

The invention provides an LTE cluster system frequency band selection method and device. The method comprises the following steps: calculating modulus 3 values of PCIs in all communities and distributing different cluster group call frequency bands for the communities with the different modulus 3 values; transmitting distributed cluster group call data by utilizing the distributed frequency bands. Through the LTE cluster system frequency band selection method and device provided by the invention, the modulus 3 values of the PCIs in all the communities are calculated, and the different frequency bands are distributed for the communities with the different modulus 3 values of the PCIs, so that the interference when a user performs resource scheduling is reduced, and further, the problem that edge user cluster group call resources cannot be analyzed is solved.

Description

LTE trunking system frequency band selection method and device

technical field

The present invention relates to the technical field of frequency band selection, in particular to a method and device for frequency band selection of an LTE trunking system.

Background technique

The LTE (Long Term Evolution, long-term evolution) trunking system includes two logical channels, TCCH (Trunking Control Channel) and TTCH (Trunking Traffic Channel). Among them, the TCCH is a point-to-multipoint downlink channel dedicated to the trunking, and is used to transmit group control information, such as group call establishment, group call release, speech right notification, and short messages. The TTCH is a point-to-multipoint downlink channel dedicated to the cluster, and is used to transmit group downlink service data.

At present, both TCCH and TTCH adopt dynamic scheduling or semi-persistent scheduling. As shown in Figure 1, users in cell A and cell B cross area D receive TCCH and TTCH information of cell A and cell B at the same time, and the The TCCH and TTCH information of the two cells are scheduled using the same algorithm on the PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) in the frequency domain.

However, in the prior art, the frequency domain resources are the same, which causes severe interference during resource scheduling, and makes it impossible to analyze the cluster group call information.

Contents of the invention

(1) Solved technical problems

The technical problem solved by the invention is: how to solve the problem of serious interference of users during resource scheduling.

(2) Technical solution

In order to solve the above problems, the invention provides a method for selecting an LTE trunking system frequency band, comprising:

Calculating the modulo 3 value of the physical cell identity PCI of each cell, and assigning different cluster group call frequency bands to cells with different modulo 3 values;

The allocated trunking group call data is sent by using the allocated frequency band.

Preferably, the calculation of the modulo 3 value of the physical cell identity PCI of each cell further includes:

PCIs with different PCI modulo 3 values are allocated to co-sited cells, and PCIs with different PCI modulo 3 values are allocated to adjacent cells.

Preferably, the allocation of different cluster group call frequency bands to cells with different modulo 3 values specifically includes:

Divide the frequency into three bands;

When the modulo 3 values of the PCI of the cell are 0, 1 or 2, the frequency of a frequency band is arbitrarily allocated to the cell.

Preferably, the lengths of the three frequency bands are equally divided.

In order to solve the above problems, the present invention also provides a LTE trunking system frequency band selection device, including:

A calculation module, configured to calculate the modulo 3 value of the physical cell identity PCI of each cell, and transmit the calculation result to the allocation module;

The allocation module is configured to allocate different cluster group call frequency bands to cells with different modulo 3 values according to the calculation results, and transmit the allocation results to the sending module;

The sending module is configured to use the allocated frequency band to send the allocated cluster group call data.

Preferably, the allocation module is further configured to allocate PCIs with different PCI modulo 3 values to co-sited cells, and allocate PCIs with different PCI modulo 3 values to adjacent cells.

Preferably, the device also includes:

A division module, configured to divide the frequency into three frequency bands;

The allocation module is further configured to arbitrarily allocate a frequency of a frequency band to the cell when the modulo 3 values of the PCI of the cell are 0, 1 or 2 respectively.

Preferably, the lengths of the three frequency bands are equally divided.

Preferably, the device is set in a base station.

(3) Beneficial effects

The present invention provides a method and device for selecting a frequency band of an LTE cluster system, and by calculating the modulus 3 value of PCI of each cell, different frequency bands are allocated to cells with different modulus 3 values of PCI, thereby reducing the interference of users when performing resource scheduling , thereby avoiding the problem that the group call resource of the edge user group cannot be resolved.

Description of drawings

FIG. 1 is a flowchart of a method provided by Embodiment 1 of the present invention;

Fig. 2 is a flow chart of the method provided by Embodiment 2 of the present invention;

Fig. 3 is a schematic diagram of seven neighboring cells provided by Embodiment 2 of the present invention;

FIG. 4 is a schematic diagram of configuration of seven cell group call frequency bands provided by Embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of three adjacent cells provided by Embodiment 2 of the present invention;

Fig. 6 is a schematic structural diagram of a device provided by Embodiment 3 of the present invention.

Detailed ways

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Example 1:

In order to solve the problem in the prior art that users have serious interference during resource scheduling, an embodiment of the present invention provides a method for selecting an LTE cluster system frequency band. The method flow chart is shown in FIG. 1 , and the method includes:

Step 101: Calculate the modulus 3 value of PCI of each cell, and allocate different cluster group call frequency bands for cells with different modulus 3 values;

Step 102: Send the allocated cluster group call data by using the allocated frequency band.

The embodiment of the present invention allocates different frequency bands to cells with different PCI modulo 3 values by calculating the modulo 3 value of each cell's PCI, thereby reducing user interference during resource scheduling, thereby avoiding group call resources of edge user clusters Unresolvable problem.

By assigning PCIs with different PCI modulus 3 values to co-sited cells, and assigning PCIs with different PCI modulus 3 values to adjacent cells, so that when different frequency bands are allocated according to different PCI modulo 3 values, adjacent cells or co-sited The frequencies used by the cells are in different frequency bands, which reduces the interference between cells and improves the reception effect of trunking group call resources.

By dividing the frequency into three frequency bands, there are three PCI modulo 3 values in total, and different frequency bands are allocated to the cells according to different PCI modulo 3 values, thereby reducing interference between cells.

Example 2

In order to solve the problem of serious interference of users during resource scheduling, the second embodiment of the present invention provides a method for selecting an LTE cluster system frequency band. The method flow chart is shown in Figure 2, including:

Step 201: Allocating cluster group call data for each cell;

Wherein, the trunking group call resources include trunking control channel resources and trunking service channel resources.

Step 202: according to the physical cell identifier PCI allocation algorithm, assign PCI to each cell;

Among them, there are 504 PCI (Physical Cell Identifier) in the TD-LTE (Time Division Long Term Evolution) system. If the same PCI with the same frequency occurs in the same cell, it will cause strong interference. However, limited by the available frequency bands of TD-LTE at present, TD-LTE is likely to adopt the same-frequency networking method, which makes PCI planning particularly important. In order to avoid interference between adjacent areas, PCIs with the same modulo 3 value of PCI should be avoided from being allocated to adjacent areas.

In the embodiment of the present invention, the PCI allocation method is as follows: assign PCIs with different PCI modulo 3 values to co-sited cells, and assign PCIs with different PCI modulo 3 values to adjacent cells.

Step 203: divide the frequency into three frequency bands;

Wherein, the lengths of the three frequency bands divided into frequency bands may be equal or unequal.

In the embodiment of the present invention, the frequency is divided into three frequency bands respectively F0, F1 and F2. For example, if the frequency is 100MHz, divide the frequency into three frequency bands, F0=1~33MHz, F1=34~66MHz, F2=67~100MHz.

Step 204: Calculate the modulus 3 value of PCI of each cell, and allocate different cluster group call frequency bands for cells with different modulus 3 values;

Among them, Fn=PCI mod3, when calculating the Fn=0 of the cell, the F0 frequency band is allocated to the cell; when calculating the Fn=1 of the cell, the F1 frequency band is allocated to the cell; The cell allocates the F2 frequency band.

In the embodiment of the present invention, the different frequency bands allocated to cells with different modulo 3 values are not limited to the above-mentioned allocation method, and F1, F2 or F3 can be arbitrarily allocated to cells with modulo 3 values of 0, 1 or 2.

Step 205: According to the allocated frequency band, use the allocated frequency band to send the allocated trunking group call data.

As shown in FIG. 3 , there are 7 closely adjacent cells. When allocating frequency bands to these 7 cells, use the allocation method of PCI to allocate frequency bands to the 7 cells respectively.

Wherein, the modulo 3 values of the PCIs allocated to the co-sited cells are different, and the modulo 3 values of the PCIs allocated to adjacent cells are different. Furthermore, different frequency bands are allocated to the seven cells.

The F0 frequency band is allocated to Cell 0, the F1 frequency band is allocated to Cell 3, Cell 5, and Cell 7, and the F2 frequency band is allocated to Cell 2, Cell 4, and Cell 6, as shown in Figure 4.

As shown in Figure 5, it is a schematic diagram of frequency band allocation for three adjacent cells. According to the method provided by the embodiment of the present invention, the F0 frequency band is allocated to the cell A, the F1 frequency band is allocated to the cell B, and the F2 frequency band is allocated to the cell C. In this way, the problem of difficult demodulation of group call resources of edge user groups is avoided, and the problem of voice/video jamming is solved.

Example 3:

The embodiment of the present invention also provides an LTE trunking system frequency band selection device, as shown in Figure 6, including:

A calculation module 601, configured to calculate the modulo 3 value of the physical cell identity PCI of each cell, and transmit the calculation result to the allocation module;

The allocation module 602 is configured to allocate different cluster group call frequency bands to cells with different modulo 3 values according to the calculation results, and transmit the allocation results to the sending module;

The sending module 603 is configured to use the allocated frequency band to send the allocated cluster group call data.

Further, the allocation module is further configured to allocate PCIs with different PCI modulo 3 values to co-sited cells, and allocate PCIs with different PCI modulo 3 values to adjacent cells.

Further, the device also includes:

A division module, configured to divide the frequency into three frequency bands;

The allocation module is further configured to arbitrarily allocate a frequency of a frequency band to the cell when the modulo 3 values of the PCI of the cell are 0, 1 or 2 respectively.

Further, the lengths of the three frequency bands are equally divided.

Further, the device is set in a base station.

In the embodiment of the present invention, by using the calculation module to calculate the modulo 3 value of the PCI of each cell, and using the allocation module to allocate different frequency bands for the cells with different modulo 3 values of the PCI, thereby reducing the interference of the user when performing resource scheduling, thereby avoiding The problem that the edge user cluster group call resource cannot be resolved.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (9)

1. a LTE group system band selection methods, is characterized in that, comprising:

The mould 3 calculating the Physical Cell Identifier PCI of each community is worth, for mould 3 is worth the different cluster multi call frequency range of different cell allocation;

Utilize the frequency range of distributing, send the described cluster multi call data of distributing.

2. the method for claim 1, is characterized in that, the mould 3 of the Physical Cell Identifier PCI of described each community of calculating is worth, and comprises further:

For co-sited cell allocation PCI mould 3 is worth different PCI, for neighbor cell allocation PCI mould 3 is worth different PCI.

3. the method for claim 1, is characterized in that, is describedly worth the different cluster multi call frequency range of different cell allocation for mould 3, specifically comprises:

Frequency partition is become three frequency ranges;

When mould 3 value of community PCI is respectively 0,1 or 2, the frequency of a frequency range is distributed arbitrarily in Ze Weigai community.

4. method as claimed in claim 3, is characterized in that, the equal decile of length of described three frequency ranges.

5. a LTE group system frequency band selection device, is characterized in that, comprising:

Computing module, the mould 3 for the Physical Cell Identifier PCI calculating each community is worth, and result of calculation is transferred to distribution module;

Described distribution module, for being that mould 3 is worth the different cluster multi call frequency range of different cell allocation according to described result of calculation, and is transferred to sending module by allocation result;

Described sending module, for utilizing the frequency range of distribution, sends the described cluster multi call data of distributing.

6. device as claimed in claim 5, is characterized in that, described distribution module, also for being worth different PCI for co-sited cell allocation PCI mould 3, for neighbor cell allocation PCI mould 3 is worth different PCI.

7. device as claimed in claim 5, it is characterized in that, described device also comprises:

Divide module, for frequency partition being become three frequency ranges;

Described distribution module, also for when mould 3 value of community PCI is respectively 0,1 or 2, the frequency of a frequency range is distributed arbitrarily in Ze Weigai community.

8. device as claimed in claim 7, is characterized in that, the equal decile of length of described three frequency ranges.

9. the device according to any one of claim 5 ~ 8, is characterized in that, described device is arranged in a base station.