CN101854635A - Method and device for sending inter-cell interference coordination indication information - Google Patents

Abstract

The invention discloses a method and a device for sending interference coordination instruction information between cells. The method includes: a cell sends ICIC indication information to its adjacent cells through an air interface, wherein the ICIC indication information is used to realize the ICIC algorithm function. The present invention solves the problem that ICIC indication information cannot be transmitted between home base stations and between home base stations and macro base stations because there is no X2 interface, and further realizes the transmission of ICIC indication information by home base stations.

Description

Method and device for sending inter-cell interference coordination indication information

technical field

The present invention relates to the communication field, in particular to a method and device for sending Inter Cell Interference Coordination (ICIC for short) indication information.

Background technique

At present, the physical layer of the Long-Term Evolution (LTE) system uses Orthogonal Frequency Division Multiplexing (OFDM) technology, which solves the problem of interference in the cell (sector). Time has certain advantages over Code Division Multiple Access (CDMA) technology. However, the inter-cell interference problem brought about by the OFDM system may be more severe than that of the CDMA system, especially when adjacent cells are of the same frequency. The idea of the ICIC technology is to coordinate physical resource allocation between adjacent cells to avoid or reduce Inter-Cell Interference (ICI).

Specifically, for the uplink, when the serving base station schedules the physical resource block (Physical ResourceBlock, referred to as UE) to the user equipment (User Equipment, referred to as UE) at the edge of the cell as a relatively high proportion of the total PRB of the cell, the serving base station sends The adjacent base station sends a high interference indication (High Interference Indication, HII for short), indicating that the cell is about to experience strong interference in these PRBs. Adjacent cells that receive the HII indication try not to allocate these PRBs to edge users and center users with higher Signal Interference and Noise Ratio (SINR) requirements during scheduling. When the serving base station detects relatively large uplink interference, it sends an overload indication (OI for short) to a neighboring base station, indicating that strong interference has occurred in these PRBs in the cell. When the adjacent cell receives the OI report, it will take self-interference reduction measures, that is, the adjacent cell checks whether the edge users of the cell use a PRB with a higher OI. If so, consider reducing the power. If the interference cannot be reduced, adjust The time-frequency resource of the UE.

For the downlink, the serving base station uses Relative Narrowband TX Power (RNTP for short) to inform the adjacent base station that the transmit power of the user on the PRB indicated will be higher than a certain threshold. After receiving the RNTP indication, the adjacent base station refers to the above The information determines the scheduling resources.

In order to meet the challenge of Wireless Fidelity (WiFi for short) and enhance the indoor coverage capability, a femtocell is added to the LTE system. There are three access modes of femtocells: open, closed and mixed. The closed mode home base station only allows authorized users to access, such as family members, group members and other users. These authorized users are called closed subscriber groups (CSG for short), and the authorization information is stored in the UE's In the Universal Subscriber Identity Module (USIM for short).

The home base station can use the frequency resources specially reserved by the operator for all home base stations, or use the same frequency resources as the macro base station. The cell covered by the macro base station is called a macro cell. Correspondingly, the cell covered by the home base station is called a CSG cell. Since the Femtocell is mobile as a user's private device, and the power of the Femtocell can be adjusted independently by the user, with the deployment of a large number of Femtocells, after the addition of Femtocells, the interference problem is not only the interference between the existing macro cells and macro cells , increasing the interference between the macro cell and the CSG cell, and the interference between the CSG cell and the CSG cell.

According to the 3rd Generation Partnership Project (3rd Generation Partnership Project, referred to as 3GPP) protocol TS 36.423V8.3.0, the indication information (OI\HII\RNTP, etc.) It is transmitted through the load message (LOAD INFORMATION) of the X2 interface.

Fig. 1 is a schematic diagram of the connection structure of a home base station according to the related art, as shown in Fig. The home base station 3 is connected to the core network through the S1 interface. It can be seen that there is no X2 interface between the current home base stations and between the home base station and the macro base station, which will cause the lack of the ICIC function of the home base station. Therefore, an alternative method is needed to Solve the transfer of ICIC instruction information.

For the problem in the related art that ICIC indication information cannot be transmitted between home base stations and between home base stations and macro base stations because there is no X2 interface, no effective solution has been proposed so far.

Contents of the invention

The present invention is proposed in view of the problem that the home base station in the related art cannot realize the transmission of ICIC indication information due to lack of X2 interface. Therefore, the main purpose of the present invention is to provide a scheme for sending ICIC indication information to solve the above problems.

In order to achieve the above object, according to one aspect of the present invention, a method for sending inter-cell interference coordination ICIC indication information is provided.

The method for sending inter-cell interference coordination ICIC indication information according to the present invention includes: a cell sends ICIC indication information to its adjacent cells through an air interface, wherein the ICIC indication information is used to implement ICIC algorithm functions.

Preferably, the cell sending the ICIC indication information to the neighboring cell through the air interface includes: the cell sending the ICIC indication information to the neighboring cell through the air interface via the user equipment using the neighboring cell as the serving cell.

Preferably, after the user equipment receives the ICIC indication information and before sending the ICIC indication information to the adjacent cell, the above method further includes: the user equipment judges whether ICIC algorithm processing is required according to the ICIC indication information, and if the judgment result is yes, Send ICIC indication information to adjacent cells.

Preferably, the user equipment judging whether to perform ICIC algorithm processing according to the ICIC indication information includes: the user equipment determines whether to perform ICIC algorithm processing according to whether the user equipment occupies resources indicated in the ICIC indication information where interference occurs.

Preferably, the user equipment sends the ICIC indication information related to itself in the received ICIC indication information to the adjacent cell.

Wherein, the user equipment is a user equipment located in an adjacent cell and capable of receiving messages from the cell.

Preferably, after the cell sends the ICIC indication information to the adjacent cell through the air interface, the method further includes: the adjacent cell receives the ICIC indication information from the cell, and performs ICIC algorithm processing according to the ICIC indication information.

Wherein, the information content of the ICIC indication information includes at least one of the following: information of an overload indication, information of a strong interference indication, information of a relative narrowband transmission power indication, and newly defined ICIC indication information, wherein the newly defined ICIC indication information uses multiple A physical resource block or a frequency band is an indication unit.

Preferably, the cell and/or adjacent cells include one of the following: a CSG cell and a macro cell.

Preferably, the ICIC indication information is carried by one of the following signalings: radio resource control layer signaling, media access control layer signaling, and physical layer signaling.

Wherein, the radio resource control layer signaling is a system broadcast message.

Wherein, the physical layer signaling adopts a predetermined time-frequency resource position.

In order to achieve the above object, according to another aspect of the present invention, a device for sending ICIC indication information is provided.

The device for sending ICIC indication information according to the present invention is set in a cell and includes: a sending module for sending ICIC indication information to its adjacent cells through an air interface, wherein the ICIC indication information is used to implement ICIC algorithm functions.

Through the present invention, the method of transmitting ICIC indication information between cells through the air interface solves the problem in the related art that ICIC indication information cannot be transmitted between home base stations and between home base stations and macro base stations because there is no X2 interface. Furthermore, the transmission of the ICIC indication information by the home base station is realized. For the macro base station and the macro base station, if there is no X2 interface, the technical solution of the present invention can also be used to realize the transfer of ICIC indication information between the macro base stations.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a schematic diagram of a connection structure of a home base station according to related technologies;

FIG. 2 is a schematic diagram of a network topology structure of a CSG cell for implementing an embodiment of the present invention;

FIG. 3 is a flowchart of directly sending ICIC indication information to adjacent cells through a system broadcast message according to Embodiment 1 of the present invention;

4 is a flow chart of directly sending ICIC indication information to adjacent cells through physical layer signaling according to Embodiment 2 of the present invention;

FIG. 5 is a flow chart of sending ICIC indication information to adjacent cells through a UE relay system broadcast message according to Embodiment 3 of the present invention.

Detailed ways

Functional Overview

Considering the problem in the related art that the transfer of ICIC indication information cannot be realized because there is no X2 interface between the home base station and between the home base station and the macro base station, the embodiment of the present invention provides a scheme for sending the ICIC indication information. The ICIC indication information is transmitted between the home base station and the macro base station through the air interface, that is, the serving cell sends the ICIC indication information for implementing the ICIC algorithm function to the adjacent cell through the air interface, which can realize the Transfer of ICIC indication information between macro base stations. The present invention is also applicable to the situation that there is no X2 interface between the macro base station and the macro base station.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

method embodiment

According to an embodiment of the present invention, a method for sending ICIC indication information is provided, which is applied in an LTE system. The method includes: a cell sends ICIC indication information to its adjacent cells through an air interface, wherein the ICIC indication information is used to realize the ICIC algorithm function.

Among them, there are two implementation methods, method 1: the cell directly sends the ICIC indication information to the adjacent target cell, and method 2: the cell performs relay processing on the ICIC indication information through the UE, and forwards it to the neighboring cell. That is, the cell may send the ICIC indication information to the adjacent cell through the air interface via the UE using the adjacent cell as the serving cell. The UE may be a UE located in an adjacent cell and capable of receiving messages from the cell.

Specifically, when performing the forwarding process, the UE may perform the forwarding according to whether it is necessary for the ICIC process. That is, the cell sends the ICIC indication information to the UE through the air interface; the UE receives the ICIC indication information, and according to the ICIC indication information (that is, according to whether it occupies the interference resources indicated in the ICIC indication information) to determine whether it is necessary for it (UE itself) performs ICIC algorithm processing, and sends ICIC instruction information to its serving cell if the judgment result is yes.

Among them, in order to save air interface resources, the UE can send the ICIC indication information related to itself in the received ICIC indication information to the adjacent cell, that is to say, the content of the ICIC indication information sent by the UE to its serving cell can be only related to The content of the ICIC instruction information related to itself is sent to its serving cell.

Thereafter, the adjacent cell receives the ICIC indication information from the cell, and may perform ICIC algorithm processing according to the ICIC indication information.

Wherein, the information content of the above-mentioned ICIC indication information may include at least one of the following: OI information, HII information, RNTP information, newly defined ICIC indication information, wherein, in order to save air interface resources, the newly defined ICIC indication information , using multiple physical resource blocks or frequency bands as an indication unit.

The above ICIC indication information may be carried by one of the following signalings: radio resource control (Radio Resource Control, referred to as RRC) layer signaling, media access control (Media Access Control, referred to as MAC) layer signaling, physical layer signaling. Wherein, the RRC layer signaling may be a system broadcast message, and the physical layer signaling may use a predetermined time-frequency resource location for UE to receive.

Wherein, the cell and/or the adjacent cell may include one of the following: a CSG cell and a macro cell. The ICIC indication information may be sent from the CSG cell to the CSG cell, may be sent from the CSG cell to the macro cell, may be sent from the macro cell to the CSG cell, or may be sent from the macro cell to the macro cell.

It should be noted that the above-mentioned "adjacent" relationship between cells may include but not limited to the following relationships: adjacent relationship, containment relationship, or included relationship.

Through this embodiment, the method of transmitting ICIC indication information between cells through the air interface is adopted, which solves the problem in the related art that the home base station cannot realize the transmission of ICIC indication information because there is no X2 interface, and further realizes the transmission of ICIC indication information by the home base station. transmission.

The implementation process of the embodiment of the present invention will be described in detail below with reference to examples.

Fig. 2 is a schematic diagram of the network topology structure of the CSG cell used to implement the embodiment of the present invention. As shown in Fig. 2, CSG cell 1 is adjacent to CSG cell 2-7, and CSG cell 1-7 all use the same frequency band, belonging to In the same frequency cell, the bandwidth of each cell is 5M (25PRB). There are 4 UEs in CSG cell 1, wherein UE1 and UE2 belong to cell edge users. In the CSG cell 4, there are 2 UEs, among which UE8 belongs to the cell edge user. The situation of users in other CSG cells is also shown in FIG. 2 . The embodiments of the present invention will be described below based on the network topology in FIG. 2 .

It should be noted that the steps shown in the flowcharts of the following figures may be executed in a computer system such as a set of computer-executable instructions, and, although a logical order is shown in the flowcharts, in some cases , the steps shown or described may be performed in a different order than here.

Embodiment one

When the number of PRBs scheduled by a CSG cell to edge UEs reaches a certain threshold, it needs to notify neighboring cells of the strong interference with PRBs, and neighbor cells should try to avoid these PRBs when scheduling their edge UEs. Assume that the threshold configured in the background is 60%. Assume that the system broadcast message 13 is used to notify neighboring cells of the strong PRB interference of the cell. The system broadcast message 13 includes the cell ID and the interference information (for example, HII related information) of each PRB of the cell.

FIG. 3 is a flow chart of directly sending ICIC indication information to adjacent cells through a system broadcast message according to Embodiment 1 of the present invention. As shown in FIG. 3 , the process specifically includes the following steps 301 to 303:

Step 301: When UE1 and UE2 in CSG cell 1 establish a connection with the cell to upload and download data, and the number of occupied uplink PRBs is 16 PRBs, CSG cell 1 judges whether the ratio of PRBs used by edge UEs to the total PRBs is Exceeding the threshold value, when the ratio of the PRBs used by the edge UE to the total number of PRBs exceeds 60% of the configured threshold value, the adjacent cell is notified to perform interference reduction processing.

Step 302: CSG cell 1 transmits the system broadcast message 13 by broadcasting, and sends the interference information of each PRB of CSG cell 1 to the surrounding neighbor cells (that is, sends ICIC indication information), indicating that these PRBs have been allocated to edge users of CSG cell 1. .

Step 303: After receiving the system broadcast message 13 of CSG cell 1, the adjacent CSG cell 4 obtains the interference information of each PRB of CSG cell 1, and then CSG cell 4 avoids these PRBs when scheduling resources for UE8. The processing of other neighboring cells is similar to that of CSG cell 4 .

Through this embodiment, it is realized that the ICIC indication information is directly sent to adjacent cells through a system broadcast message.

Embodiment two

FIG. 4 is a flow chart of directly sending ICIC indication information to adjacent cells through physical layer signaling according to Embodiment 2 of the present invention. As shown in FIG. 4 , the process specifically includes the following steps 401 to 403:

Step 401: When CSG cell 1 detects that some PRBs have relatively large uplink interference, it notifies neighboring cells to perform interference reduction processing.

Step 402: CSG cell 1 directly notifies neighboring cells that overload occurs on these PRBs through physical layer signaling (ie, sends ICIC indication information), which means that CSG cell 1 has experienced strong interference on these PRBs.

Step 403: After receiving the OI report (i.e., ICIC indication information), the adjacent CSG cell 4 will take self-interference reduction measures, that is, the CSG cell 4 checks whether the user UE8 at the edge of the cell uses the overloaded PRB on the CSG cell 1, If it is found that UE8 is using the overloaded PRB, consider reducing the power of UE8. If the interference cannot be reduced, adjust the frequency resource of UE8 to avoid using the overloaded PRB on CSG cell 1. The processing of other neighboring cells is similar to that of CSG cell 4.

Through this embodiment, it is realized that the ICIC indication information is directly sent to the adjacent cell through the physical layer signaling.

Embodiment three

Assume that the system broadcast message 13 is used to notify neighboring cells of the strong PRB interference of the cell. The system broadcast message 13 includes the cell ID and the interference information of each PRB of the cell (for example, overload indication related information).

FIG. 5 is a flow chart of sending ICIC indication information to adjacent cells through UE relay system broadcast messages according to Embodiment 3 of the present invention. As shown in FIG. 5 , the process specifically includes the following steps 501 to 505:

Step 501: When CSG cell 1 detects relatively large uplink interference of some PRBs, it needs to notify neighboring cells to perform interference reduction processing.

Step 502: CSG cell 1 notifies UEs of adjacent cells that overload occurs on these PRBs through a broadcast system broadcast message 13, which means that CSG cell 1 has experienced strong interference on these PRBs.

Step 503: After UE8 in the neighboring CSG cell 4 receives the system broadcast message 13 sent by CSG cell 1, it compares the overload PRB information indicated in the system broadcast message 13 sent by CSG cell 1 with the PRB used by itself, It is judged whether these overloaded PRBs are used. If UE8 uses these overloaded PRBs, step 504 is performed.

Step 504: UE8 sends a report or instruction to the CSG cell 4 base station, requesting to reduce interference or adjust frequency resources.

Step 505: After receiving the report or indication message sent by UE8, the adjacent CSG cell 4 takes interference reduction measures for UE8, reduces power for UE8 or adjusts frequency resources of UE8, and avoids using PRBs that are overloaded in CSG cell 1. The processing of other neighboring cells is similar to that of CSG cell 4.

Through this embodiment, it is realized that the ICIC indication information is sent to the adjacent cell through the UE relaying the system broadcast message.

Device embodiment

Embodiment one

According to an embodiment of the present invention, there is provided a device for sending ICIC indication information, which is set in a cell, and the sending device can be used to implement the above-mentioned method for sending inter-cell interference coordination ICIC indication information, and the sending device includes: a sending module , for sending ICIC indication information to its neighboring cells through the air interface, wherein the ICIC indication information is used to implement the ICIC algorithm function.

Wherein, the above-mentioned information content of the ICIC indication information includes at least one of the following: OI information, HII information, RNTP information, and preset (newly defined) information.

The above ICIC indication information may be carried by one of the following signalings: radio resource control (Radio Resource Control, referred to as RRC) layer signaling, media access control (Media Access Control, referred to as MAC) layer signaling, physical layer signaling. Wherein, the RRC layer signaling may be a system broadcast message, and the physical layer signaling may use a predetermined time-frequency resource location for UE to receive.

Wherein, the above-mentioned cell and/or adjacent cell may include one of the following: a CSG cell and a macro cell.

Through this embodiment, the sending device sends the ICIC indication information to its adjacent cell through the air interface, thereby realizing the transmission of the ICIC indication information by the home base station.

Embodiment two

According to an embodiment of the present invention, a receiving device for ICIC indication information is provided, which is set in a cell. The receiving device can be used in combination with the above-mentioned sending device for ICIC indication information. The receiving device includes: a receiving module for passing The air interface receives ICIC indication information from its adjacent cells, wherein the ICIC indication information is used to implement the ICIC algorithm function.

Wherein, the above-mentioned information content of the ICIC indication information includes at least one of the following: OI information, HII information, RNTP information, and preset (newly defined) information.

The above ICIC indication information may be carried by one of the following signalings: radio resource control (Radio Resource Control, referred to as RRC) layer signaling, media access control (Media Access Control, referred to as MAC) layer signaling, physical layer signaling. Wherein, the RRC layer signaling may be a system broadcast message, and the physical layer signaling may use a predetermined time-frequency resource location for UE to receive.

Wherein, the above-mentioned cell and/or adjacent cell may include one of the following: a CSG cell and a macro cell.

Through this embodiment, the receiving device receives the ICIC indication information from its adjacent cell through the air interface, thereby realizing the transmission of the ICIC indication information by the home base station.

In summary, through the above-mentioned embodiments of the present invention, the method of transmitting ICIC indication information between cells through the air interface solves the problem in the related art that the home base station cannot realize the transmission of ICIC indication information because there is no X2 interface, and then The transmission of the ICIC indication information by the home base station is realized.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Optionally, they can be implemented with program codes executable by a computing device, so that they can be stored in a storage device and executed by a computing device, or they can be made into individual integrated circuit modules, or they can be integrated into Multiple modules or steps are fabricated into a single integrated circuit module to realize. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. the sending method of an inter cell interference coordination ICIC indication information is characterized in that, comprising:

A sub-district sends the ICIC indication information by air interface to its abutting subdistrict, and wherein, described ICIC indication information is used to realize the ICIC algorithm function.

2. method according to claim 1 is characterized in that, described sub-district sends described ICIC indication information by described air interface to described abutting subdistrict and comprises:

Described sub-district by described air interface via described abutting subdistrict is sent described ICIC indication information as the subscriber equipment of Serving cell to described abutting subdistrict.

3. method according to claim 2 is characterized in that, after described subscriber equipment receives described ICIC indication information and before described abutting subdistrict sends described ICIC indication information, described method also comprises:

Described subscriber equipment judges whether that according to described ICIC indication information needs carry out the ICIC algorithm process, is under the situation that is in judged result, sends the ICIC indication information to described abutting subdistrict.

4. ICIC indication information according to claim 3 is characterized in that, described subscriber equipment judges whether that according to described ICIC indication information needs carry out described ICIC algorithm process and comprise:

Whether needs carry out described ICIC algorithm process to described subscriber equipment according to the resource judgment that self whether takies generation interference indicated in the described ICIC indication information.

5. ICIC indication information according to claim 3 is characterized in that, the ICIC indication information relevant with self sends to described abutting subdistrict in the described ICIC indication information that described subscriber equipment will receive.

6. according to each described method in the claim 2 to 5, it is characterized in that described subscriber equipment is the subscriber equipment that is in the described abutting subdistrict and possesses the ability of the message that receives described sub-district.

7. according to each described method in the claim 1 to 5, it is characterized in that, in described sub-district by described air interface after described abutting subdistrict sends described ICIC indication information, described method also comprises:

Described abutting subdistrict receives the described ICIC indication information from described sub-district,

And carry out the ICIC algorithm process according to described ICIC indication information.

8. according to each described method in the claim 1 to 5, it is characterized in that it is one of following that the information content of described ICIC indication information comprises at least:

The information of the information of the information of overload indication, strong jamming indication, Relative Narrowband TX Power indication, the ICIC indication information of redetermination, wherein, the ICIC indication information of described redetermination serves as the indication unit with a plurality of Physical Resource Block or frequency range.

9. according to each described method in the claim 1 to 5, it is characterized in that it is one of following that described sub-district and/or described abutting subdistrict comprise:

Non-public authorized user group CSG sub-district, macrocell.

10. according to each described method in the claim 1 to 5, it is characterized in that described ICIC indication information carries by one of following signaling:

Radio resource control layer signaling, media access control layer signaling, physical layer signaling.

11. method according to claim 10 is characterized in that, described radio resource control layer signaling is a system broadcast message, and described physical layer signaling adopts predetermined running time-frequency resource position.

12. the dispensing device of an ICIC indication information is arranged in the sub-district, it is characterized in that, comprising:

Sending module is used for sending ICIC by air interface to its abutting subdistrict and refers to

Show information, wherein, described ICIC indication information is used to realize the ICIC algorithm function.

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