CN101018220A - Implementation method and device for avoiding the interference between the cells - Google Patents

Abstract

The invention relates to a method and device for realizing interference avoidance between cells. The present invention mainly includes: respectively assigning corresponding frequency resources to cell boundary users using interference coordination and cell boundary users using interference cancellation as frequency resources occupied by interference cancellation and interference coordination, specifically corresponding frequency resources can be allocated in advance, The frequency resources occupied by interference elimination and interference coordination can also be allocated when the service load changes and meets predetermined conditions; then, the frequency resources occupied by interference elimination and interference coordination can be dynamically adjusted according to the service load in the communication system. The realization of the present invention makes it possible to use two implementation methods of avoiding inter-cell interference in the wireless communication system at the same time, so that the respective advantages of the two methods can be complemented to reduce their respective limitations. Moreover, the present invention also increases the flexibility of the system by dynamically adjusting the frequency resources occupied by interference elimination and interference coordination, thereby supporting various service requirements.

Description

Implementation method and device for avoiding interference between cells

technical field

The invention relates to the technical field of wireless communication, in particular to a technology for eliminating inter-cell interference.

Background technique

At present, multi-carrier-based OFDM (Orthogonal Frequency Division Multiplexing) technology in wireless communication systems has attracted more and more attention from the industry. The basic idea of OFDM technology is to divide the time-frequency resources of the wireless communication system into several orthogonal narrowband sub-channels in the frequency domain, and high-speed data streams are transmitted in parallel on each sub-channel through serial-to-parallel conversion. Due to the narrowband characteristics of the sub-channels, the influence of multipath can be overcome and the orthogonality between the sub-channels can be maintained, thereby ensuring that the interference between users in the cell is very small.

The advantage of the OFDM technology is that it can ensure that the signals of the users in the cell are orthogonal, and avoid interference between users in the cell. However, there is still interference between cells of the OFDM technology, that is, for a user at a cell boundary, it may still be interfered by a signal sent by an adjacent cell.

In order to solve the inter-cell interference, two solutions are proposed, namely the implementation of Interference Co-ordination (Interference Co-ordination) and the implementation of Interference Cancellation (Interference Cancellation), to avoid interference between cells.

The implementation manners of the two schemes will be described respectively below.

(1) Implementation scheme of interference coordination

In this solution, frequency resources are divided, and different frequency resources are allocated to users at cell boundaries in different cells, so that interference between users at cell boundaries can be reduced. Wherein, the frequency allocated preferentially to each cell for boundary users is called the primary frequency of the cell, and the other frequencies of the cell are called secondary frequencies.

In the interference coordination scheme, users at the border of adjacent cells need to use different primary frequencies to avoid inter-cell interference, so that the frequency reuse factor is greater than 1, and the secondary frequency can be allocated to users in the center of the cell, with a frequency reuse factor of 1. However, in this method, for a certain cell, the number of available subcarriers for cell border users is limited, thus limiting the peak rate and throughput of the cell border users. For some specific cases, due to the limitation of frequency resources Communication requirements cannot be met. For example, when there are a large number of adjacent cell border users or there is a high peak rate service demand at the cell border, the limited frequency resources allocated to cell border users will not be able to meet the corresponding needs.

(2) Implementation scheme of interference elimination

The method is as follows: when users occupying the same frequency resources in adjacent cells interfere with each other, each user first demodulates and decodes the interference signal, and separates and removes the restored interference signal from the received signal to improve the accuracy of the required frequency. The correct rate of signal demodulation and decoding.

In the process of interference detection and separation, the receiving user needs to know the signal configuration of the interfering user from the adjacent cell, including the modulation and coding method, FEC (forward error correction) method and coding rate, etc. These information require additional A large amount of signaling notifies corresponding users, which will inevitably increase the load and complexity of the system.

In view of the advantages and disadvantages of the above two implementation schemes for avoiding inter-cell interference, an implementation method for avoiding inter-cell interference that combines an implementation scheme for interference coordination and an implementation scheme for interference cancellation is also proposed. Among them, all users are firstly divided into cell center users and cell border users, as shown in Figure 1: the part of the gray hexagonal area in the figure can use all frequency resources, and the frequency reuse factor is 1; The parts marked with grids, dots and blanks represent the method of interference coordination frequency planning adopted by cell boundary users, and the frequency reuse factor is greater than 1.

In addition, the part marked by the circular gray area in FIG. 1 represents the method of interference detection and separation for cell boundary users, occupying all subcarriers so that the frequency reuse factor is one. These cell boundary users use frequency resource blocks (Chunk) at the same location and the same size for interference cancellation, and a Chunk is defined as some subcarriers that are continuous in frequency for several symbols that are continuous in time.

The advantage of the combination of the above two schemes is that the interference of adjacent cells can be avoided or minimized through frequency division, the SIR (signal-to-interference ratio) of users at the cell border can be effectively improved, and the implementation complexity is relatively low.

However, in the above technical solution, no detailed resource allocation method is designed according to the specific system load of each cell. If adjacent cells with different load conditions adopt the same resource allocation method and ratio, the utilization of limited physical resources will not Without reasonable arrangements, the throughput of the system is also limited.

In addition, the above technical solution does not give a specific relationship between physical resource blocks, coding blocks, and resource blocks for interference detection and elimination. If it is assumed that coding blocks with the same size as the Chunk are mapped for coding, then only Perform "double-user detection" or "multi-user detection" on chunks of the same size to recover the interference signal and separate them. If the size of the encoding block is mapped to a physical resource that is not a chunk size, for example, when it is twice the size of the chunk , if the interference cancellation is also performed in units of Chunk, when demodulation and decoding are performed, the interfered Chunk only contains a part of the interference block of the interference block, making it impossible to correctly decode and detect the interference signal, and it is also impossible Recover and remove this part of the interfering signal.

In a word, there are still some problems in the above-mentioned implementation solution of the prior art, which make it impossible to effectively avoid possible interference in the wireless communication system.

Contents of the invention

The purpose of the present invention is to provide a method and device for avoiding interference between cells, so that the implementation scheme of interference coordination and the implementation scheme of interference elimination can effectively realize complementary advantages, thereby effectively avoiding possible interference in the wireless communication system .

The purpose of the present invention is achieved through the following technical solutions:

The present invention provides a method for realizing interference avoidance between cells, including:

Corresponding frequency resources are assigned to cell boundary users using interference coordination and cell boundary users using interference cancellation as frequency resources occupied for interference cancellation and interference coordination, and dynamically adjust the frequency resources occupied for interference cancellation and interference coordination.

Described method specifically comprises:

Allocating a part of all available frequency resources to cell border users using interference cancellation as frequency resources occupied by interference cancellation, and the frequency resources are shared by adjacent cell users;

Divide the remaining available frequency resources into primary frequency and secondary frequency, wherein the primary frequency is preferentially allocated to cell border users used for interference coordination as frequency resources occupied by interference coordination, and the secondary frequency is allocated to cell center users;

Dynamically adjust the frequency resource occupied for interference elimination and interference coordination.

Described method specifically comprises:

Divide all available frequency resources into primary frequency and secondary frequency, where the primary frequency is preferentially allocated to cell border users as frequency resources occupied by interference coordination, and the secondary frequency is allocated to cell center users;

When the number of users at the cell border reaches a predetermined value or the peak rate demand at the cell border reaches a predetermined value, a part of the main frequency is allocated as a frequency resource occupied by interference elimination, and the frequency resource is shared with adjacent cells ;

The frequency resource occupied by the interference detection and elimination and interference coordination is dynamically adjusted.

The methods described include:

An interference cancellation resource block comprising a group of continuous subcarriers used for interference cancellation contains at least one complete coding block, and is composed of an integer multiple of continuous physical resource blocks at the same position.

The methods described include:

When a certain user's original information transmission block is larger than a predetermined value, the user's original transmission block is divided into multiple coding blocks, so that the size of each coding block corresponds to the interference cancellation resource block.

The methods described include:

The adjustment of the frequency resources occupied by interference coordination is realized by distinguishing the resources occupied by different cell boundary users through different time-frequency patterns.

The methods described include:

The adjustment of frequency resources used for interference detection and elimination is realized by distinguishing different time-frequency patterns from frequency resources used for interference coordination.

The methods described include:

The resource blocks occupied for interference detection and elimination adopt different modulation and coding modes, or adopt the same modulation and coding mode.

The method further includes: when the resource blocks used by adjacent cells for interference cancellation adopt different modulation and coding schemes, it is necessary to notify the interfered user of configuration information of the interfering user.

In the present invention, the process of notifying the interfered user of the configuration information of the interfering user includes:

The base station of the interfering cell notifies the base station of the interfered cell of the configuration information of the interfering user, and the base station of the interfered cell notifies the interfered user of this information;

or,

The interfering cell base station notifies the interfered cell base station of the identity information of the interfering user, and the interfered cell base station notifies the interfered user of the configuration information of the corresponding interfering user according to the identity information.

The frequency resource occupied for interference coordination is set to be adjustable among adjacent cells according to different load requirements of adjacent cells.

The dynamic adjustment specifically includes:

In the cell, the frequency resource allocated in the cell for interference elimination and interference coordination is adjusted according to the number of users at the cell border or the service requirements of the cell border users.

The present invention also provides an implementation device for avoiding interference between cells, including:

Frequency resource allocation module: used to determine corresponding frequency resources for cell boundary users of interference coordination and interference cancellation respectively as frequency resources occupied by interference cancellation and interference coordination;

A frequency adjustment module: used to dynamically adjust the frequency resources occupied for interference elimination and interference coordination.

The frequency resource allocation module specifically includes:

Interference elimination frequency resource allocation module: used to allocate a part of the frequency resources of the cell to the cell boundary users used for interference elimination as frequency resources occupied by interference elimination, and the frequency resources are shared with adjacent cell users;

Interference coordination frequency resource allocation module: used to divide another part of the frequency resources of the cell into primary frequency and secondary frequency. Among them, the primary frequency is preferentially allocated to the frequency resource occupied by the interference coordination cell border users as interference coordination, and the secondary frequency is allocated to community center users.

The frequency resource allocation module specifically includes:

Interference coordination frequency resource allocation module: divide the frequency resources of the cell into primary frequency and secondary frequency, wherein the primary frequency is preferentially allocated to cell border users as frequency resources occupied by interference coordination, and the secondary frequency is allocated to cell center users;

Judgment processing module: used to trigger the interference cancellation frequency resource allocation module when it is judged that the number of adjacent cell boundary users reaches a predetermined value or the peak rate demand at the cell boundary reaches a predetermined value;

Interference elimination frequency resource allocation module: The main frequency allocated by the interference coordination frequency resource allocation module allocates a part as the frequency resource occupied by interference elimination, and uses the frequency resource jointly with adjacent cells.

The device also includes:

Information processing module: used to divide the user's original transmission block into multiple CBs when the original information transmission block of a certain user is larger than a predetermined value, so that the size of each CB corresponds to the ICRB.

In the present invention, when the resource blocks used for interference cancellation in adjacent cells adopt different modulation and coding schemes, the device further includes:

Interference information notification module: set in the base station of the interfering cell, used to notify the base station of the interfered cell of the configuration information of the interfering user;

The first information sending module: set in the base station of the interfered cell, for notifying the interfered user of the configuration information of the interfered user.

In the present invention, when the resource blocks used for interference cancellation in adjacent cells adopt different modulation and coding schemes, the device further includes:

Identity information notification module: installed in the base station of the interfering cell, used to notify the base station of the interfered cell of the identity information of the interfering user;

The second information sending module: set in the base station of the interfered cell, used for notifying the interfered user of the configuration information of the corresponding interfered user according to the identity information of the interfered user.

It can be seen from the above-mentioned technical solutions provided by the present invention that the present invention provides a more flexible implementation scheme combining interference coordination, interference avoidance and interference cancellation, and provides specific physical resource blocks and coding blocks as well as methods for interference detection and cancellation. Relationships between resource blocks. Therefore, the realization of the present invention makes it possible to use two implementation methods of avoiding inter-cell interference in the wireless communication system at the same time: one is interference coordination to avoid inter-cell interference, and the other is to perform interference cancellation; thus making the two methods To achieve their respective advantages and complement each other to reduce their respective limitations. At the same time, the present invention also dynamically adjusts frequency resources occupied by interference elimination and interference coordination, thereby increasing system flexibility and supporting various service requirements.

In addition, the present invention is not limited by the size of the user data transmission block so as to support various service requirements. Larger data transmission block services can perform interference elimination, and smaller data transmission block services use interference coordination to avoid interference.

Description of drawings

FIG. 1 is a schematic diagram of a system combining interference cancellation and interference coordination in the prior art;

FIG. 2 is a schematic diagram of a specific implementation of a system combining interference cancellation and interference coordination provided by the present invention;

FIG. 3 is a schematic diagram of dynamically adjusting frequency resources occupied by interference cancellation and interference coordination in the present invention;

FIG. 4 is a schematic diagram of a resource allocation method based on interference coordination;

FIG. 5 is a schematic diagram of a frequency resource adjustment process for interference cancellation;

FIG. 6 is a schematic diagram of an interference cancellation block including a complete coding block;

FIG. 7 is a schematic diagram of an interference cancellation block including a segmented complete coding block;

Fig. 8 is a schematic diagram of the device according to the present invention.

Detailed ways

The present invention is realized on the basis of two implementation schemes for avoiding interference based on interference coordination and interference elimination. In the process of realization, dynamic adjustment of frequency resources occupied by interference coordination and interference elimination is realized, so as to effectively support different system environments and various business requirements.

In the scheme of combining interference coordination and interference elimination provided by the present invention, different frequency resource allocation methods can be used to realize dynamic adjustment of the frequency resources occupied by interference coordination and interference elimination; corresponding frequency resources can be allocated in advance, or Allocation of frequency resources occupied by interference elimination and interference coordination can be completed when the service load changes and meets predetermined conditions.

In order to facilitate the understanding of the present invention, the specific implementation of the present invention will be described below by taking the following two specific dynamic frequency resource allocation manners as examples. Of course, the implementation of the present invention is not limited to the following two specific resource allocation manners.

(1) The first resource allocation method

In this method, a part of all available frequency resources is specially allocated to cell boundary users for interference elimination, and this part of frequency resources can be shared by adjacent cell users; after that, the rest of the cell frequency resources are divided into main Frequency and secondary frequency, the primary frequency is preferentially allocated to users at the border of the cell for interference coordination, and the secondary frequency is allocated to users at the center of the cell; after the resource allocation is completed, the frequencies used for interference elimination and interference coordination can be dynamically adjusted according to different system load conditions resource.

Referring to Figure 2, first, a part of frequency resources is specially allocated for interference detection and elimination of cell boundary users, and the black circle part in Figure 2 is the frequency resource for cell boundary user interference detection and elimination; then, interference coordination is performed Resource allocation, that is, the other parts marked with bars, dots and blanks in Figure 2 represent that users at the cell border adopt interference coordination frequency planning to avoid interference, and do not use interference detection and elimination technology. The part marked by the gray hexagon in the middle is the allocation Users in the cell center can use all frequency resources, and the frequency reuse factor is one.

At this time, this part of the frequency resources allocated to the cell border users for interference elimination can be semi-statically or dynamically adjusted. As shown in Figure 3, different cell base stations can allocate the frequency resources used for interference Frequency resources are allocated to cell border users for interference coordination or to cell center users, for example:

When the system load at the cell border is small, as shown in Fig. 3 where there is only interference coordination, in this case, the frequency resources allocated for interference detection and elimination can be reassigned to the user at the cell center, while The interference can be avoided only by relatively simple interference coordination techniques. Moreover, when some resources are allocated to users in the center of the cell, the signal power attenuation is relatively large due to the distance from the adjacent cell, and the interference caused to the adjacent cell is small, so it is no longer necessary to perform interference detection and elimination.

When a certain cell border has a heavy load or a high peak rate requirement, as shown in Figure 3 where there is only interference cancellation, there is no frequency resource for interference coordination, and all cell border users share as many frequencies as possible resources to meet system requirements.

(2) The second resource allocation method

Another resource allocation method is based on interference coordination.

In this method, the frequency resources in the cell are first divided into primary frequency and secondary frequency according to the frequency coordination scheme: the primary frequency is preferentially allocated to the border users of each cell, and the border users of adjacent cells use different primary frequencies, To avoid inter-cell interference; the secondary frequency is allocated to users in the center of the cell. Then, when a large number of users appear on a cell border or some adjacent cell borders or there is a high peak rate demand, at this time, the method of interference coordination cannot meet the needs of the existing system. Part of the main frequency of some adjacent cells is shared with adjacent cells for interference detection and elimination. At the same time, it is also necessary to dynamically adjust frequency resources occupied by interference detection and elimination and interference coordination in the communication system.

For example, as shown in Figure 4, when there is frequency contention between adjacent cells, there are many border users in cell 1 and cell 2 (that is, reaching a predetermined number of users) or all require a very high peak rate (that is, the peak rate When the demand reaches the predetermined value), after negotiation between the two cells, a part of the frequency resources used for interference coordination of the two adjacent cells can be divided, and this part of the frequency resources can be used as the border users of cell 1 and cell 2. The frequency resource used. At the same time, this part of frequency is used to detect and separate interference by using interference elimination technology, and the corresponding frequency resources used for interference elimination can also be adjusted according to different system load conditions.

In addition, in the solution of combining interference coordination and interference elimination provided by the present invention, the primary frequency resource allocated to a certain cell for interference coordination, that is, the frequency resource allocated preferentially to the cell boundary, may also be allocated according to the cell and the The different system load conditions of the adjacent cell borders are adjusted semi-statically or dynamically. For example, when there is a sudden large throughput demand on a certain cell border, if the load on the adjacent cell border is small, the base station of the cell Negotiate with the adjacent cell base station to reallocate part of the frequency resources occupied by adjacent cell boundary users to users in this cell. At this time, the frequency reuse factor of each cell may not be an integer.

The frequency resources used for interference coordination can be divided into frequency resources occupied by different cell border users through different time-frequency patterns, and the frequency resources used for interference cancellation can be distinguished from the frequency resources used for interference coordination through different time-frequency patterns . For example, as shown in Figure 5, the time-frequency patterns of different patterns represent the time-frequency resources used by different adjacent cells, and the blank, gray and bar parts represent the resources occupied by the three adjacent cells 1, 2 and 3 respectively. Time-frequency resources for interference coordination. When there are many users (reaching the predetermined number of users) or high peak rate demand (the peak rate demand reaches the predetermined value) on the cell borders of both cell 1 and cell 2, and the cell border of cell 3 has no load, the original allocation to The time-frequency resources used for interference coordination in cell 3 are re-allocated to border users in cell 1 and cell 2 for interference cancellation.

In the present invention, in order to realize the above-mentioned solution of combining interference coordination technology and interference elimination, the relationship between specific physical resource blocks, coding blocks, and resource blocks for interference detection and elimination is also redefined. During the interference elimination process, the interference signal at the corresponding position can be correctly detected and separated. Specifically, it can be defined as: ICRB (Interference Cancellation Resource Block, interference cancellation resource block) ICRB is composed of a continuous integer number of physical resource blocks PRB (Physical Resource Block, physical resource block), the number can be determined by a suitable typical system load Determine and ensure sufficient channel coding gain, where the PRB is the Chunk. The ICRB contains at least one complete CB (Code Block, coding block), and the signal contained in the CB is the superposition of the interfering signal and the interfered signal. When performing interference detection and elimination, the interference must be correctly detected and separated on ICRBs with the same position and the same size.

When the size of the CB used for interference cancellation users is mapped to physical resources and can accommodate one ICRB, that is, when the ICRB used for interference cancellation contains the complete CB of some users, for example, as shown in Figure 6, when the adjacent cell A When B and B want to perform interference detection and elimination, the ICRB used contains a complete CB for some users, and the CB is mapped to several PRBs on the physical resource. In Figure 6, each ICRB is composed of 4 consecutive PRBs. The 4 Each PRB contains a complete coding block of two boundary users of cell A and cell B, and 6 CBs of 6 users correspond to 6 ICRBs. In this way, only a simple "dual-user detection" is required to recover and separate the interference signals during interference elimination.

When a user's original information transmission block is relatively large, for example, when the CB mapped to a physical resource according to a certain coding gain is larger than a specific resource block that can perform interference cancellation, the user's original transmission block can be divided into multiple CBs To ensure that the size of each CB corresponds to the ICRB. For example, as shown in Figure 7, user 3 and user 4 of cell A and user 2 of cell B occupy two consecutive ICRBs, including two complete CBs, while user 1 of cell B occupies three discontinuous ICRBs, Each ICRB contains a complete CB. At this time, the number of PRBs included in each ICRB should still be suitable for typical system loads and sufficient coding gain. So in this case, even if the original user information transmission block used for interference detection and elimination is relatively large, similar "dual user detection" can be performed to complete interference elimination.

The resource blocks used for interference detection and elimination can adopt different modulation and coding modes, for example, adopt different modulation modes, FEC modes and coding gains to adapt to different channel conditions; or, they can also use the same modulation and coding mode, such as QPSK (four Phase shift keying) and Turbo (parallel concatenated interleaved convolutional code) encoding, which will greatly simplify the user's operation of detecting interference signals.

In addition, the interference elimination method using interference detection separation requires the receiving user to know the configuration information of the interfering user from the adjacent cell, that is, some configuration information of the interfering signal, including modulation and coding mode, FEC mode and coding rate, etc., so that the interference The signal is recovered and processed separately. Therefore, in the communication system, some additional methods or signaling are needed to notify the configuration information of the interfering user. The method of notifying the configuration information of the interfering user adopted in the present invention can be implemented in the following two ways, which are respectively:

1. The interfering cell base station notifies the interfered cell base station of the configuration information of the interfered user, and then the interfered cell base station notifies the interfered user of this information.

2. The interfering cell base station notifies the interfered cell base station of the ID (user identity) of the interfering user, and then the interfered cell base station notifies the interfered user of the corresponding information, and the interfered user receives the configuration of the user identity sent by the interfering cell base station information.

When the resource blocks used by adjacent cells for interference cancellation adopt the same modulation and coding scheme, since the interfered user has already known the configuration information of the interfering user in advance, no additional signaling is required to notify the interference signal information.

The present invention also provides an implementation device for avoiding interference between cells. The specific implementation of the device is shown in Figure 8, and specifically includes the following components:

(1) Frequency resource allocation module

It is used to determine corresponding frequency resources for cell boundary users of interference coordination and interference cancellation respectively as frequency resources occupied by interference cancellation and interference coordination;

The module can be implemented in the following two specific structures, namely:

In the first implementation structure, the frequency resource allocation module specifically includes:

Interference elimination frequency resource allocation module: used to allocate a part of the frequency resources of the cell to the cell boundary users used for interference elimination as frequency resources occupied by interference elimination, and the frequency resources are shared with adjacent cell users;

Interference coordination frequency resource allocation module: used to divide another part of the frequency resources of the cell into primary frequency and secondary frequency. Among them, the primary frequency is preferentially allocated to the frequency resource occupied by the interference coordination cell border users as interference coordination, and the secondary frequency is allocated to community center users.

In the second implementation structure, the frequency resource allocation module specifically includes:

Interference coordination frequency resource allocation module: divide the frequency resources of the cell into primary frequency and secondary frequency, wherein the primary frequency is preferentially allocated to cell border users as frequency resources occupied by interference coordination, and the secondary frequency is allocated to cell center users;

Judgment processing module: used to trigger the interference cancellation frequency resource allocation module when it is judged that the user at the border of the adjacent cell reaches the predetermined value or the peak rate demand at the border of the cell reaches the predetermined value;

Interference elimination frequency resource allocation module: The main frequency allocated by the interference coordination frequency resource allocation module allocates a part as the frequency resource occupied by interference elimination, and uses the frequency resource jointly with adjacent cells.

(2) Frequency adjustment module

It is used for dynamically adjusting the frequency resource occupied by interference elimination and interference coordination.

The device also includes:

Information processing module: used to divide the user's original transmission block into multiple CBs when the original information transmission block of a cell boundary user used for interference elimination is greater than a predetermined value, so that the size of each CB is equal to the ICRB correspond.

In addition, when the resource blocks used by adjacent cells for interference cancellation adopt different modulation and coding schemes, the device also needs to notify the interfered user of the configuration information of the interfering user. For this reason, it is still shown in FIG. 8 , it is necessary to add corresponding modules to the device, which can be realized through the following two specific structures:

Structure 1 is that the modules added in the device are as follows:

Interference information notification module: set in the base station of the interfering cell, used to notify the base station of the interfered cell of the configuration information of the interfering user;

The first information sending module: set in the base station of the interfered cell, for notifying the interfered user of the configuration information of the interfered user.

Structure 2 is as follows for the module that increases in described device:

Identity information notification module: installed in the base station of the interfering cell, used to notify the base station of the interfered cell of the identity information of the interfering user;

The second information sending module: set in the base station of the interfered cell, used for notifying the interfered user of the configuration information of the corresponding interfered user according to the identity information of the interfered user.

To sum up, the implementation of the present invention enables two implementation methods of avoiding inter-cell interference to be used in the wireless communication system at the same time: one is interference coordination to avoid inter-cell interference, and the other is to perform interference cancellation; so that both The respective advantages of the two methods complement each other to reduce their respective limitations. At the same time, the present invention also dynamically adjusts frequency resources occupied by interference elimination and interference coordination, thereby increasing system flexibility and supporting various service requirements.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (18)

1. An implementation method for avoiding interference between cells, comprising:

and allocating corresponding frequency resources as frequency resources occupied by interference elimination and interference coordination for the cell boundary users using interference coordination and the cell boundary users using interference elimination respectively, and dynamically adjusting the frequency resources occupied by the interference elimination and the interference coordination.

2. The method according to claim 1, characterized in that the method comprises in particular:

allocating a part of all available frequency resources to cell boundary users using interference cancellation as frequency resources occupied for interference cancellation, wherein the frequency resources are shared by adjacent cell users;

dividing the rest available frequency resources into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to a cell boundary user for interference coordination to serve as a frequency resource occupied by the interference coordination, and the secondary frequency is allocated to a cell center user;

and dynamically adjusting the frequency resources occupied by the interference elimination and interference coordination.

3. The method according to claim 1, characterized in that the method comprises in particular:

dividing all available frequency resources into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to a cell boundary user as a frequency resource occupied by interference coordination, and the secondary frequency is allocated to a cell center user;

when the cell boundary users reach a preset number value or the peak rate requirement of the cell boundary reaches a preset value, dividing a part of frequency resources occupied by interference elimination from the main frequency, and using the frequency resources together with the adjacent cells;

and dynamically adjusting the frequency resources occupied by the interference detection and elimination and the interference coordination.

4. A method according to claim 1, 2 or 3, characterized in that the method comprises:

the interference cancellation resource block for interference cancellation, which comprises a group of consecutive subcarriers, comprises at least one complete coding block and consists of integer multiples of consecutive physical resource blocks at the same position.

5. A method according to claim 1, 2 or 3, characterized in that the method comprises:

when the original information transmission block of a certain user is larger than a preset value, the original information transmission block of the user is divided into a plurality of coding blocks, and the size of each coding block corresponds to the interference elimination resource block.

6. A method according to claim 1, 2 or 3, characterized in that the method comprises:

the adjustment of the frequency resources occupied by the interference coordination is realized by distinguishing the resources occupied by the users at the boundary of different cells through different time-frequency patterns.

7. A method according to claim 1, 2 or 3, characterized in that the method comprises:

the adjustment of the frequency resources occupied for interference detection and elimination is realized by distinguishing different time-frequency patterns from the frequency resources used for interference coordination.

8. A method according to claim 1, 2 or 3, characterized in that the method comprises:

the resource blocks occupied by the interference detection and elimination adopt different modulation and coding modes or the same modulation and coding mode.

9. A method according to claim 1, 2 or 3, characterized in that the method further comprises: when resource blocks used for interference cancellation in adjacent cells use different modulation and coding schemes, configuration information of an interfering user needs to be notified to an interfered user.

10. The method of claim 9, wherein notifying the interfered user of the configuration information of the interfering user comprises:

the interfering cell base station informs the interfered cell base station of the configuration information of the interfering user, and then the interfered cell base station informs the interfered user of the information;

or,

and the interfered cell base station informs the identity information of the interfered user of the interfered cell base station, and then informs the configuration information of the corresponding interfered user of the interfered user according to the identity information.

11. A method according to claim 1, 2 or 3, wherein the frequency resources occupied by the interference coordination are configured to be adjusted between adjacent cells according to different load requirements of the adjacent cells.

12. The method according to claim 1, 2 or 3, wherein the dynamic adjustment specifically comprises:

in a cell, frequency resources which are allocated in the cell and used for interference elimination and interference coordination occupation are adjusted according to the number of users at the cell boundary or the service requirement condition of the users at the cell boundary.

13. An apparatus for avoiding interference between cells, comprising:

a frequency resource allocation module: the method comprises the steps that corresponding frequency resources are determined for cell boundary users for interference coordination and interference elimination respectively and serve as the frequency resources occupied by the interference elimination and the interference coordination;

a frequency adjustment module: for dynamically adjusting the frequency resources occupied for interference cancellation and interference coordination.

14. The apparatus of claim 13, wherein the frequency resource allocation module specifically comprises:

an interference cancellation frequency resource allocation module: the method comprises the steps of allocating a part of frequency resources of a cell to cell boundary users for interference elimination as frequency resources occupied for interference elimination, wherein the frequency resources are shared with adjacent cell users;

an interference coordination frequency resource allocation module: the method is used for dividing another part of frequency resources of the cell into a primary frequency and a secondary frequency, wherein the primary frequency is preferentially allocated to the frequency resources occupied by interference coordination cell boundary users, and the secondary frequency is allocated to cell center users.

15. The apparatus of claim 13, wherein the frequency resource allocation module specifically comprises:

an interference coordination frequency resource allocation module: dividing frequency resources of a cell into a main frequency and a secondary frequency, wherein the main frequency is preferentially allocated to cell boundary users as the frequency resources occupied by interference coordination, and the secondary frequency is allocated to cell center users;

a judgment processing module: the device comprises a frequency resource allocation module for triggering interference elimination when the situation that the user at the boundary of the adjacent cell reaches a preset value or the peak rate requirement at the boundary of the cell reaches the preset value is judged;

an interference cancellation frequency resource allocation module: and the interference coordination frequency resource allocation module divides a part of the main frequency into frequency resources occupied by interference elimination and uses the frequency resources together with the adjacent cells.

16. The apparatus of claim 13, 14 or 15, further comprising:

an information processing module: when the original information transmission block of a certain user is larger than a preset value, the original information transmission block of the user is divided into a plurality of CBs, and the size of each CB corresponds to the ICRB.

17. The apparatus according to claim 13, 14 or 15, wherein when resource blocks used for interference cancellation in adjacent cells use different modulation and coding schemes, the apparatus further comprises:

an interference information notification module: the system comprises an interference cell base station, a base station and a user equipment, wherein the interference cell base station is used for informing configuration information of an interference user to an interfered cell base station;

the first information sending module: and the base station is arranged in the interfered cell base station and is used for informing the configuration information of the interfering user to the interfered user.

18. The apparatus according to claim 13, 14 or 15, wherein when resource blocks used for interference cancellation in adjacent cells use different modulation and coding schemes, the apparatus further comprises:

identity information notification module: the system comprises an interference cell base station, a base station and a user equipment, wherein the interference cell base station is used for informing the identity information of an interference user to the interfered cell base station;

a second information sending module: and the base station is arranged in the interfered cell base station and used for notifying the configuration information of the corresponding interfering user to the interfered user according to the identity information of the interfering user.

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