CN101854635B - The sending method of inter cell interference coordination indication information and device - Google Patents
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Abstract
The invention discloses a kind of sending method and device of inter cell interference coordination indication information.The method comprises: a community sends ICIC indication information by air interface to its abutting subdistrict, and wherein, ICIC indication information is used for realizing ICIC algorithm function.The invention solves the problem that cannot realize the transmission of ICIC indication information between Home eNodeB and between Home eNodeB and macro base station owing to not having X2 interface, and then achieve the transmission of Home eNodeB to ICIC indication information.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for sending Inter Cell Interference Coordination (ICIC) indication information.
Background
Currently, the physical layer of a Long-Term Evolution (LTE) system adopts an Orthogonal Frequency Division Multiplexing (OFDM) technology, and the OFDM technology has certain advantages over a Code Division Multiple Access (CDMA) technology in solving the problem of interference in a cell (sector). However, the problem of inter-cell interference with OFDM systems can be more severe than with CDMA systems, especially when there is co-frequency between adjacent cells. The idea of the ICIC technique is to perform physical resource allocation coordination between adjacent cells to avoid or reduce inter-cell interference (ICI).
Specifically, for uplink, when a serving base station schedules a User Equipment (User Equipment, UE) at a cell edge, where a ratio of Physical Resource Blocks (PRBs) to total PRBs of the cell is relatively High, the serving base station transmits a High Interference Indication (HII) to an adjacent base station, which indicates that the cell is about to generate strong Interference in the PRBs. The neighbor cells receiving the HII indication need not allocate these PRBs to edge users and central users with higher signal to interference and Noise Ratio (SINR) requirements as much as possible during scheduling. When the serving base station detects that the uplink interference is relatively large, an Overload Indication (OI for short) is sent to the neighboring base station, which indicates that the cell has generated strong interference in these PRBs. And after receiving the OI report, the adjacent cell takes self-reduction interference measures, namely the adjacent cell checks whether PRBs with higher OI exist in the edge users of the cell, if so, the power reduction is considered, and if the interference cannot be reduced, the time-frequency resource of the UE is adjusted.
For downlink, the serving base station uses a relative narrowband transmit Power indication (referred to as RNTP for short) to tell that the user transmit Power on the PRB indicated by the neighboring base station will exceed a certain threshold, and the neighboring base station determines the scheduling resource with reference to the information after receiving the RNTP indication.
In order to meet the challenge of Wireless Fidelity (WiFi), indoor coverage capability is enhanced, and a home base station is added to the LTE system. There are three access modes of the femtocell: open, closed and mixed. The femtocell in the Closed mode only allows authorized users to access, such as users of family members, Group members, and the like, where the authorized users are called as Closed Subscriber Group (CSG), and the authorization information is stored in a Subscriber identity Module (USIM) of the UE.
The femtocell may use a frequency resource specially reserved for all femtocells by an operator, or may use a frequency resource identical to that of the macro base station, a cell covered by the macro base station is referred to as a macro cell, and correspondingly, a cell covered by the femtocell is referred to as a CSG cell. Because the femtocell has mobility as a private device of a user, and a power user of the femtocell can be autonomously mediated, with the large deployment of the femtocell, after the femtocell is increased, the interference problem is that the interference between the macrocell and the macrocell is increased, the interference between the macrocell and the CSG cell is increased, and the interference between the CSG cell and the CSG cell is increased.
It is stated in the third Generation Partnership Project (3rd Generation Partnership Project, 3GPP for short) protocol TS 36.423 V8.3.0 that the indication INFORMATION (OI \ HII \ RNTP, etc.) for ICIC functions is communicated between the macro and macro base stations via LOAD INFORMATION (LOAD INFORMATION) over the X2 interface.
Fig. 1 is a schematic diagram of a connection structure of a home base station according to the related art, and as shown in fig. 1, a home base station 1 connected to a terminal 1 and a terminal 2, a home base station 2 connected to a terminal 3 and a terminal 4, and a home base station 3 connected to a terminal 5 are connected to a core network through an S1 interface, it can be seen that there is no X2 interface between home base stations and between a home base station and a macro base station at present, which may cause a lack of ICIC function of the home base station, and therefore, an alternative way needs to be adopted to solve the transmission of ICIC indication information.
For the problem that ICIC indication information transfer cannot be achieved due to the fact that no X2 interface exists between home base stations and between a home base station and a macro base station in the related art, no effective solution is provided at present.
Disclosure of Invention
The invention is provided for solving the problem that the home base station in the related art cannot realize ICIC indication information transfer due to no X2 interface, and therefore, a main object of the invention is to provide a transmission scheme for ICIC indication information to solve the above problem.
To achieve the above object, according to an aspect of the present invention, there is provided a method for transmitting inter-cell interference coordination ICIC indication information.
The method for sending the inter-cell interference coordination (ICIC) indication information comprises the following steps: a cell transmits ICIC indication information to its neighboring cells over an air interface, wherein the ICIC indication information is used to implement ICIC algorithm functions.
Preferably, the cell transmitting the ICIC indication information to the neighboring cell over the air interface includes: the cell transmits the ICIC indication information to the neighboring cell through an air interface via the user equipment having the neighboring cell as a serving cell.
Preferably, after the user equipment receives the ICIC indication information and before transmitting the ICIC indication information to the neighboring cell, the method further includes: and the user equipment judges whether ICIC algorithm processing needs to be carried out or not according to the ICIC indication information, and sends the ICIC indication information to the adjacent cell under the condition that the judgment result is yes.
Preferably, the determining, by the ue, whether ICIC algorithm processing needs to be performed according to the ICIC indication information includes: and the user equipment judges whether to need to carry out ICIC algorithm processing according to whether the user equipment occupies the resource which is indicated in the ICIC indication information and generates interference.
Preferably, the user equipment sends the ICIC indication information related to itself in the received ICIC indication information to the neighboring cell.
The user equipment is in an adjacent cell and has the capability of receiving the message of the cell.
Preferably, after the cell transmits the ICIC indication information to the neighboring cell over an air interface, the method further includes: and the adjacent cell receives the ICIC indication information from the cell and carries out ICIC algorithm processing according to the ICIC indication information.
Wherein, the information content of the ICIC indication information at least includes one of the following: the method comprises the following steps of overload indication information, strong interference indication information, relative narrowband transmission power indication information and newly defined ICIC indication information, wherein the newly defined ICIC indication information takes a plurality of physical resource blocks or frequency bands as an indication unit.
Preferably, the cell and/or the neighbouring cell comprises one of: a CSG cell and a macro cell of a non-public authorized user group.
Preferably, the ICIC indication information is carried by one of the following signaling: radio resource control layer signaling, media access control layer signaling, physical layer signaling.
Wherein, the signaling of the radio resource control layer is a system broadcast message.
Wherein, the physical layer signaling adopts a preset time frequency resource position.
In order to achieve the above object, according to another aspect of the present invention, there is provided a transmitting apparatus of ICIC indication information.
The transmission device of the ICIC indication information according to the present invention is set in a cell and includes: and a sending module, configured to send ICIC indication information to an adjacent cell thereof through an air interface, where the ICIC indication information is used to implement an ICIC algorithm function.
By adopting the method for transmitting the ICIC indication information between the cells through the air interface, the invention solves the problem that the ICIC indication information transmission between the home base stations and the macro base station can not be realized because of no X2 interface in the related technology, thereby realizing the transmission of the ICIC indication information by the home base stations. For the macro base station and the macro base station, if no X2 interface exists, the technical scheme of the present invention may also be adopted to implement the transmission of the ICIC indication information between the macro base stations.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a schematic diagram of a connection structure of a home base station according to the related art;
figure 2 is a schematic diagram of a network topology of a CSG cell for implementing an embodiment of the invention;
fig. 3 is a flowchart of directly transmitting ICIC indication information to a neighboring cell through a system broadcast message according to a first embodiment of the present invention;
fig. 4 is a flowchart of directly transmitting ICIC indication information to a neighboring cell through physical layer signaling according to a second embodiment of the present invention;
fig. 5 is a flowchart of sending ICIC indication information to a neighboring cell through a UE relay system broadcast message according to a third embodiment of the present invention.
Detailed Description
Overview of the function
In view of the problem that ICIC indication information cannot be transferred due to the absence of an X2 interface between home base stations and between a home base station and a macro base station in the related art, embodiments of the present invention provide a transmission scheme for ICIC indication information, where ICIC indication information is transmitted between home base stations and between a home base station and a macro base station through air interfaces, that is, a serving cell transmits ICIC indication information for implementing an ICIC algorithm function to an adjacent cell through an air interface, so that ICIC indication information can be transferred between home base stations and between a home base station and a macro base station. The invention is also suitable for the condition that no X2 interface exists between the macro base station and the macro base station.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Method embodiment
According to the embodiment of the invention, a method for sending ICIC indication information is provided, which is applied to an LTE system. The method comprises the following steps: a cell transmits ICIC indication information to its neighboring cells over an air interface, wherein the ICIC indication information is used to implement ICIC algorithm functions.
There are two implementation ways, one: the cell directly sends the ICIC indication information to the adjacent target cell, and the second mode is as follows: and the cell transfers the ICIC indication information through the UE and forwards the ICIC indication information to the adjacent cell. That is, the cell may transmit the ICIC indication information to the neighboring cell through an air interface via the UE having the neighboring cell as a serving cell. The UE may be a UE that is in a neighboring cell and has the capability to receive messages of that cell.
Specifically, when the UE performs the relay processing, the relay may be performed according to whether the ICIC processing is necessary. That is, the cell transmits ICIC indication information to the UE through an air interface; the UE receives the ICIC indication information, judges whether ICIC algorithm processing needs to be carried out on the UE (the UE) according to the ICIC indication information (namely, whether the UE occupies the resource which is indicated by the ICIC indication information and generates interference), and sends the ICIC indication information to a service cell of the UE under the condition that the judgment result is yes.
In order to save air interface resources, the UE may send the ICIC indication information related to the UE in the received ICIC indication information to the neighboring cell, that is, the ICIC indication information content sent by the UE to its serving cell may be only sent to its serving cell.
Thereafter, the neighboring cell receives the ICIC indication information from the cell, and may perform ICIC algorithm processing according to the ICIC indication information.
The information content of the ICIC indication information may include at least one of the following: the information of OI, the information of HII, the information of RNTP and the newly defined ICIC indication information, wherein the newly defined ICIC indication information takes a plurality of physical resource blocks or frequency bands as an indication unit in order to save air interface resources.
The ICIC indication information described above may be carried by one of the following signaling: radio Resource Control (RRC) layer signaling, Media Access Control (MAC) layer signaling, and physical layer signaling. 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 neighboring cell may include one of: CSG cell, 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 "adjacent" relationship between the cells may include, but is not limited to, the following relationships: a neighbor relationship, an inclusion relationship, or an included relationship.
By the embodiment, the method for transmitting the ICIC indication information between the cells through the air interface is adopted, so that the problem that the femtocell cannot realize the ICIC indication information transmission due to the absence of the X2 interface in the related technology is solved, and the femtocell can realize the ICIC indication information transmission.
The following describes in detail the implementation of the embodiments of the present invention with reference to examples.
Fig. 2 is a schematic diagram of a network topology structure of a CSG cell for implementing the embodiment of the present invention, and as shown in fig. 2, a CSG cell 1 is adjacent to CSG cells 2 to 7, and the CSG cells 1 to 7 all use the same frequency band and belong to a common-frequency cell, and a bandwidth of each cell is 5M (25 PRB). There are 4 UEs in CSG cell 1, where UE1 and UE2 belong to cell edge users. In CSG cell 4, there are 2 UEs, wherein UE8 belongs to a cell edge user. The user situation of other CSG cells is also shown in fig. 2. An embodiment of the invention will be described below based on the network topology of fig. 2.
It should be noted that the steps illustrated in the flow charts of the following figures may be performed in a computer system such as a set of computer executable instructions and that, although a logical order is illustrated in the flow charts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
Example one
When the PRB number of the CSG cell scheduled to the edge user accounts for the total PRB number and reaches a certain threshold, peripheral adjacent cells need to be informed of the condition of strong interference of the PRB, and the PRBs are avoided as much as possible when the edge UE is scheduled by the adjacent cells. The threshold for the background configuration is assumed to be 60%. It is assumed that the peripheral neighbor cell is notified that the strong interference PRB is broadcasted in the system broadcast message 13, and the system broadcast message 13 includes the cell ID and interference information (for example, HII related information) of each PRB of the cell.
Fig. 3 is a flowchart of directly sending ICIC indication information to an adjacent cell through a system broadcast message according to a first embodiment of the present invention, as shown in fig. 3, the flowchart specifically includes the following steps 301 to 303:
step 301: when connection is established between the UE1 and the UE2 in the CSG cell 1 and the cell, data uploading and downloading are carried out, the number of occupied uplink PRBs is 16, the CSG cell 1 judges whether the proportion of the PRBs used by the edge UE in the total PRBs exceeds a threshold value, and when the proportion of the PRBs used by the edge UE in the total PRBs exceeds a configured threshold value by 60%, an adjacent cell is informed to carry out interference reduction processing.
Step 302: the CSG cell 1 transmits, to the neighboring cells, interference information (i.e., transmits ICIC indication information) of each PRB of the CSG cell 1 by broadcasting the transmission system broadcast message 13, which indicates that the PRB has been allocated to the edge user of the CSG cell 1.
Step 303: after receiving the system broadcast message 13 of the CSG cell 1, the neighboring CSG cell 4 acquires interference information of each PRB of the CSG cell 1, and then the CSG cell 4 avoids these PRBs when performing resource scheduling on the UE 8. The processing of the other neighbor cells is similar to that of the CSG cell 4.
Through the embodiment, the ICIC indication information is directly sent to the adjacent cell through the system broadcast message.
Example two
Fig. 4 is a flowchart for directly sending ICIC indication information to an adjacent cell through physical layer signaling according to the second embodiment of the present invention, and as shown in fig. 4, the flowchart specifically includes the following steps 401 to 403:
step 401: when the CSG cell 1 detects that the uplink interference of certain PRBs is relatively large, the adjacent cell is informed to carry out interference reduction processing.
Step 402: the CSG cell 1 directly notifies the neighboring cells of the overload (i.e., sends the ICIC indication information) on these PRBs through physical layer signaling, that is, it indicates that the CSG cell 1 has strong interference on these PRBs.
Step 403: after receiving the OI report (i.e., ICIC indication information), the neighboring CSG cell 4 may take self-decreasing interference measures, that is, the CSG cell 4 checks whether the UE8 of the edge user of the cell has the PRB that is overloaded on the CSG cell 1, if it is found that the UE8 has the PRB that is overloaded, power reduction is performed on the UE8, and if interference cannot be reduced, the frequency resource of the UE8 is adjusted to avoid using the PRB that is overloaded on the CSG cell 1. The processing of other neighbours is similar to that of the CSG cell 4.
By the embodiment, the ICIC indication information is directly transmitted to the adjacent cell through physical layer signaling.
EXAMPLE III
It is assumed that the peripheral neighbor cell is notified that the strong interference PRB is broadcasted in the system broadcast message 13, and the system broadcast message 13 includes the cell ID and interference information (for example, overload indication related information) of each PRB of the cell.
Fig. 5 is a flowchart of sending ICIC indication information to an adjacent cell through a UE relay system broadcast message according to a third embodiment of the present invention, and as shown in fig. 5, the flowchart specifically includes the following steps 501 to 505:
step 501: when the CSG cell 1 detects that uplink interference of some PRBs is relatively large, it needs to notify the neighboring cell to perform interference reduction processing.
Step 502: the CSG cell 1 informs the UE of the neighboring cell of the overload on these PRBs through the broadcast system broadcast message 13, i.e. indicating that the CSG cell 1 has a strong interference on these PRBs.
Step 503: after receiving the system broadcast message 13 sent by the CSG cell 1, the UE8 in the neighboring CSG cell 4 compares the overloaded PRB indicated in the system broadcast message 13 sent by the CSG cell 1 with the PRB used by itself to determine whether the overloaded PRB is used. If the UE8 uses these overloaded PRBs, step 504 is performed.
Step 504: the UE8 sends a report or indication to the CSG cell 4 base station requesting interference reduction or frequency resource adjustment.
Step 505: after receiving the report or the indication message sent by the UE8, the neighboring CSG cell 4 takes interference reduction measures for the UE8 to reduce power for the UE8 or adjust frequency resources of the UE8, thereby avoiding using the overloaded PRB in the CSG cell 1. The processing of other neighbours is similar to that of the CSG cell 4.
By the embodiment, ICIC indication information is sent to the adjacent cell by the UE transfer system broadcast message.
Device embodiment
Example one
According to an embodiment of the present invention, there is provided a transmitting apparatus for ICIC indication information, where the transmitting apparatus is disposed in a cell, and the transmitting apparatus may be configured to implement a method for transmitting ICIC indication information in interference coordination between cells, where the transmitting apparatus includes: and a sending module, configured to send ICIC indication information to an adjacent cell thereof through an air interface, where the ICIC indication information is used to implement an ICIC algorithm function.
Wherein, the information content of the ICIC indication information at least includes one of the following: information of OI, information of HII, information of RNTP, information of preset (newly defined).
The ICIC indication information described above may be carried by one of the following signaling: radio Resource Control (RRC) layer signaling, Media Access Control (MAC) layer signaling, and physical layer signaling. 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 neighboring cell may include one of the following: CSG cell, macro cell.
Through the embodiment, the transmitting device transmits the ICIC indication information to the adjacent cell through the air interface, so that the home base station can transmit the ICIC indication information.
Example two
According to an embodiment of the present invention, there is provided a receiving apparatus for ICIC indication information, the receiving apparatus being disposed in a cell, and the receiving apparatus being used in combination with the transmitting apparatus for ICIC indication information, the receiving apparatus including: and a receiving module, configured to receive ICIC indication information from a neighboring cell thereof over an air interface, where the ICIC indication information is used to implement an ICIC algorithm function.
Wherein, the information content of the ICIC indication information at least includes one of the following: information of OI, information of HII, information of RNTP, information of preset (newly defined).
The ICIC indication information described above may be carried by one of the following signaling: radio Resource Control (RRC) layer signaling, Media Access Control (MAC) layer signaling, and physical layer signaling. 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 neighboring cell may include one of the following: CSG cell, macro cell.
Through the embodiment, the receiving device receives the ICIC indication information from the adjacent cell through an air interface, and further realizes the transmission of the ICIC indication information by the home base station.
In summary, according to the embodiments of the present invention, by using the method for transmitting the ICIC indication information through the air interface between the cells, the problem that the home base station cannot implement ICIC indication information transfer due to no X2 interface in the related art is solved, and then the home base station implements ICIC indication information transfer.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for sending inter-cell interference coordination (ICIC) indication information is characterized by comprising the following steps:
a cell transmits ICIC indication information to an adjacent cell thereof through an air interface, wherein the ICIC indication information is used for realizing an ICIC algorithm function;
wherein,
the cell transmitting the ICIC indication information to the neighboring cell over the air interface includes: the cell transmitting the ICIC indication information to the neighboring cell via a user equipment having the neighboring cell as a serving cell over the air interface;
the information content of the ICIC indication information at least includes one of: the method comprises the following steps of overload indication information, strong interference indication information, relative narrowband transmission power indication information and newly defined ICIC indication information, wherein the newly defined ICIC indication information takes a plurality of physical resource blocks or frequency bands as an indication unit;
after the cell transmits the ICIC indication information to the neighboring cell over the air interface, the method further includes: and the adjacent cell receives the ICIC indication information from the cell and carries out ICIC algorithm processing according to the ICIC indication information.
2. The method of claim 1, wherein after the user equipment receives the ICIC indication information and before the ICIC indication information is transmitted to the neighboring cell, the method further comprises:
and the user equipment judges whether ICIC algorithm processing needs to be carried out or not according to the ICIC indication information, and sends the ICIC indication information to the adjacent cell under the condition that the judgment result is yes.
3. The ICIC indication information according to claim 2, wherein the determining, by the ue, whether the ICIC algorithm processing needs to be performed according to the ICIC indication information includes:
and the user equipment judges whether the ICIC algorithm processing is needed or not according to whether the user equipment occupies the resource which is indicated in the ICIC indication information and generates interference.
4. The ICIC indication information according to claim 2, wherein the ue transmits ICIC indication information related to itself in the received ICIC indication information to the neighboring cell.
5. The method according to any of claims 1-4, wherein the UE is a UE in the neighboring cell and capable of receiving the message from the cell.
6. The method according to any of claims 1 to 4, wherein the cell and/or the neighboring cell comprises one of:
a CSG cell and a macro cell of a non-public authorized user group.
7. The method according to any of claims 1 to 4, wherein the ICIC indication information is carried by one of the following signaling:
radio resource control layer signaling, media access control layer signaling, physical layer signaling.
8. The method of claim 7, wherein the rrc layer signaling is a system broadcast message, and wherein the phy layer signaling uses a predetermined time-frequency resource location.
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| CN101137236A (en) * | 2006-08-30 | 2008-03-05 | 株式会社泛泰 | Method for controlling inter-cell interference in a mobile communication system |
| CN101202974A (en) * | 2006-12-15 | 2008-06-18 | 华为技术有限公司 | A system, base station and method for multi-standard base station intercommunication |
| CN101369831A (en) * | 2007-08-16 | 2009-02-18 | 中兴通讯股份有限公司 | Restraint method and system for interference between cells |
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