CN104469813A - Method for eliminating interface between cells - Google Patents
Method for eliminating interface between cells Download PDFInfo
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- CN104469813A CN104469813A CN201310413595.9A CN201310413595A CN104469813A CN 104469813 A CN104469813 A CN 104469813A CN 201310413595 A CN201310413595 A CN 201310413595A CN 104469813 A CN104469813 A CN 104469813A
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- base station
- interference
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- user equipment
- interference base
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
Abstract
Provided in the invention is a method for eliminating an interface between cells. According to one embodiment of the invention, the method for eliminating the interference between cells in first user equipment is provided; the first user equipment is under the jurisdiction of a service base station and is affected by the potential interference of at least one second user equipment in at least one interference cell under jurisdiction of at least one interference base station. The method comprises the following steps that: step b, first downlink control information generated by the service base station for the first user equipment is received from the service base station, and network auxiliary information is received from at least one interference base station based on a predetermined transmission mode, wherein the network auxiliary information includes public information of an interference cell of an interference base station and second downlink control information that is generated by the interference base station for at least one second user equipment; and step c, on the basis of the first downlink control information, the common information of at least one interference cell, and the second downlink control information, elimination of the interferences between cells is carried out.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to a kind of method of carrying out inter-cell interference cancellation.
Background technology
The requirement carrying out supported data application for mobile network with high throughput and spectrum efficiency at present drives the demand of research and development based on the 4G network of OFDM, and this comprises WiMAX, 3GPPLTE and LTE-A.LTE and LTE-A is interference limiting system, and it is arranged in the region with intensive community.Therefore, the important research project of LTE and lte-a system is inter-cell interference cancellation.In the discussion of Release-8/9, the inter-cell interference cancellation between proposing based on the macrocell of RNTP/HII/OI.In the discussion of Release-10, the interference that CoMP and almost blank subframe are proposed between macrocell and Microcell is eliminated.In Release-11, FeICIC AF panel and the elimination with the CRS of network assistance are proposed for further performance improvement.
But, in order to deal with the data service with exponential increase, need the cell spectrum efficiency of intensive cell arrangements and improvement.Cochannel interference (co-channel interference) (being caused by presence of intercell interference or caused by the user in the community of jointly dispatching) is all the main limiting factor for obtaining better network capabilities.Compared with the elimination of transmission equipment side, receiver side AF panel or eliminate also can provide significant performance gain.In sphere of learning, confirm that serial interference elimination and parallel interference canceller can provide significant performance gain.When considering above-mentioned gain, in RAN#59 meeting, research project: the network assistance interference for LTE is eliminated and suppressed (Network Assisted InterferenceCancellation and Suppression, NAICS) to be agreed the research project into Release-12 at RAN1 and RAN4.
In RAN1#73 meeting, agree to that the top priority of research project is that the interference of PSDCH and PDSCH is eliminated/suppressed.
This research project is in commitment, and this work is based on the FelCIC of Release-11, therefore needs the detailed content limiting network-assist information.Existing scheme is the FelCIC in Release-11.Information needed for eliminating relative to the interference of PSDCH and PDSCH/suppress, the information needed for CRS interference elimination/suppression is less.Eliminate PDSCH interference may require to regenerate PDSCH signal, this information just needing network to provide enough (such as possible schedule information, demodulating information etc.).Therefore the method for FeiCIC is inadequate for the NAICS in Release-12.
Summary of the invention
Consider based on above-mentioned, according to a first aspect of the invention, propose a kind of method of carrying out inter-cell interference cancellation in first user equipment, wherein, described first user equipment is administered by serving BS, and be subject to the potential interference of at least one the second subscriber equipment at least one interfered cell administered by least one interference base station, it is the first Downlink Control Information that described first user equipment produces that described method comprises the steps: that b. receives described serving BS from described serving BS, and receive network-assist information based on predetermined transmission means from least one interference base station described, described network-assist information comprises the public information of the interfered cell of interference base station and described interference base station is the second Downlink Control Information that at least one second subscriber equipment described produces, and c. carries out inter-cell interference cancellation based on the public information of described first Downlink Control Information, at least one interfered cell described and described second Downlink Control Information.
According to a second aspect of the invention, proposing in a kind of serving BS administering first user equipment assists described first user equipment to carry out the method for inter-cell interference cancellation, wherein, described first user equipment is subject to the potential interference of at least one the second subscriber equipment at least one interfered cell administered by least one interference base station, and wherein on running time-frequency resource, be reserved with predetermined resource transmit the network-assist information of at least one interference base station described, resource wherein shared by each interference base station is mutually orthogonal, described method comprises the steps: that A. sends indication information to described first user equipment, it indicates the position of described predetermined resource on described running time-frequency resource.
According to a third aspect of the invention we, propose a kind of method of assisting first user equipment to carry out inter-cell interference cancellation in interference base station, wherein, described interference base station administers at least one second subscriber equipment, at least one second subscriber equipment described produces potential interference to described first user equipment, described first user equipment is arranged in the community administered by serving BS, and on running time-frequency resource, be wherein reserved with predetermined resource to transmit the network-assist information of at least one interference base station, resource wherein shared by each interference base station is mutually orthogonal, described method comprises the steps: that X1. sends network-assist information with predetermined transmission means to described first user equipment in the resource shared by described interference base station, described network-assist information comprises the public information of the interfered cell of described interference base station and described interference base station is the second Downlink Control Information that at least one second subscriber equipment described produces.
According to a forth aspect of the invention, propose a kind of method of carrying out inter-cell interference cancellation in first user equipment, wherein, described first user equipment is administered by serving BS, and be subject to the potential interference of at least one the second subscriber equipment at least one interfered cell administered by least one interference base station, it is the first Downlink Control Information that described first user equipment produces that described method comprises the steps: that S1. receives described serving BS from described serving BS, and receive network-assist information based on predetermined transmission means from described serving BS, the public information of at least one interfered cell described in described network-assist information comprises and at least one interference base station described are the second Downlink Control Information that at least one second subscriber equipment described produces, and S2. carries out inter-cell interference cancellation based on the public information of described first Downlink Control Information, at least one interfered cell described and described second Downlink Control Information.
According to a fifth aspect of the invention, proposing in a kind of serving BS administering first user equipment assists described first user equipment to carry out the method for inter-cell interference cancellation, wherein, described first user equipment is subject to the potential interference of at least one the second subscriber equipment at least one interfered cell administered by least one interference base station, described method comprises the steps: that i. receives network-assist information from least one interference base station described, described network-assist information comprises the public information of the interfered cell of interference base station and described interference base station is the second Downlink Control Information that at least one second subscriber equipment described produces, and ii. sends to described first user equipment the first Downlink Control Information that described serving BS is the generation of described first user equipment, and send described network-assist information based on predetermined transmission means to described first user equipment.
According to a sixth aspect of the invention, propose a kind of method of assisting first user equipment to carry out inter-cell interference cancellation in interference base station, wherein, described interference base station administers at least one second subscriber equipment, at least one second subscriber equipment described produces potential interference to described first user equipment, described first user equipment is arranged in the community administered by serving BS, described method comprises the steps: to send network-assist information to described serving BS, described network-assist information comprises the public information of the interfered cell of described interference base station and described interference base station is the second Downlink Control Information that at least one second subscriber equipment described produces.
In the present invention, solve the problem of transmission network supplementary, and be the problem of transmission Resources allocation of network-assist information.Which thereby enhance the ability eliminating presence of intercell interference in user equipment side, improve reliability and the robustness of communication.
Various aspects of the present invention are more clear by the explanation by specific embodiment hereinafter.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, other features, objects and advantages of the present invention will become more apparent:
Fig. 1 shows the scene graph carrying out inter-cell interference cancellation according to an embodiment of the invention;
Fig. 2 shows the flow chart carrying out the method for inter-cell interference cancellation according to an embodiment of the invention;
Fig. 3 shows the schematic diagram of the transmission Resources allocation for network-assist information according to an embodiment of the invention;
Fig. 4 shows the flow chart carrying out the method for inter-cell interference cancellation according to another embodiment of the invention; And
Fig. 5 shows a kind of example format of network-assist information.
In the drawings, run through different diagrams, same or similar Reference numeral represents identical or corresponding parts or feature.
Embodiment
Basic conception of the present invention is proposition one group of cochannel interference (adjacent) community, and is assigned with resource (i.e. Physical Resource Block to) for the network-assist information of interfered cell.Should be appreciated that Serving cell as the interfered cell in MU-MIMO transmission, therefore can not be excluded outside the group of interfered cell yet.
Fig. 1 shows the scene graph carrying out inter-cell interference cancellation according to an embodiment of the invention.As shown in Figure 1, serving BS administration first user equipment, interference base station administers the second subscriber equipment.In the scene of Fig. 1, first user equipment is subject to the interference of the second subscriber equipment and interference base station.At this, although it may be noted that in Fig. 1 and schematically show an interference base station and second subscriber equipment, in other embodiments of the invention, the interfered cell that can there is multiple interference base station He be associated.Each interference base station also can administer multiple the second subscriber equipment first user equipment being formed to interference.
Below, composition graphs 1, Fig. 2 and Fig. 3 are described first execution mode of the present invention.In first execution mode of the present invention, send network-assist information by interfered cell.
Fig. 2 shows the flow chart carrying out the method for inter-cell interference cancellation according to an embodiment of the invention.
In this embodiment, running time-frequency resource is reserved with predetermined resource to transmit the network-assist information of at least one interference base station, the resource wherein shared by each interference base station is mutually orthogonal.
Fig. 3 shows the schematic diagram of the transmission Resources allocation for network-assist information according to an embodiment of the invention.In the figure, the resource that predefined Physical Resource Block is right is assigned to the transmission of network-assist information.At this, show predetermined resource reserved on running time-frequency resource with empty frame, it is for transmitting the network-assist information of each interference base station.Further, the shared resource of four interfered cells is schematically shown in the figure.In these resources, four interference base stations transmit its respective network-assist information respectively.
In the embodiments of figure 3, these resources are continuous dispensing.In the embodiment that some substitute, the right resource of Physical Resource Block can be dispersion, to utilize the density of frequency.Each interfered cell is assigned with the transmission that the right resource of exclusive Physical Resource Block is come for network-assist information.The resource of the network-assist information of each interfered cell can be distributed in mutually orthogonal mode, and the resource shared by the network-assist information of each interfered cell can be staggered by the mark of community, (cell-ID shifted) identifies.Therefore improve the robustness of reception.
In one embodiment of the invention, the network-assist information of different districts can be multiplexing in time.They do not need to occur in each subframe, and the subframe comprising network-assist information can be indicated by RRC signaling.
In another embodiment of the present invention, the position of the resource that the Physical Resource Block of distribution is right can be the function of the cell ID of interfered cell.Therefore, the mode of this kind of recessiveness for subscriber equipment provides is to the network-assist information making subscriber equipment can access interested interfered cell.Alternatively, some interfered cells in the group of interfered cell also can not send any network-assist information in its resource be assigned with.The network-assist information of such as, community 3 in Fig. 3 can be left a blank and not transmit.
Get back to Fig. 2 now, in step s 201, first user equipment receives indication information from serving BS, its indicating predetermined resource position on running time-frequency resource.Also be the position of the predetermined resource in the empty frame in Fig. 3.
In step S202, it is the first Downlink Control Information that first user equipment produces that first user equipment receives serving BS from serving BS.
In step S203, first user equipment determines according to pre-defined rule the interference base station it being produced to interference.Preferably, in this step, first user equipment can identify these interfered cells above-mentioned based on the measurement of the RSRP of neighbor cell.This just means, subscriber equipment also only needs to obtain the network-assist information being assessed as the interfered cell of causing very large interference, and in eliminating from interference/suppress, obtains good gain thus.
In step S204, first user equipment is staggered by the mark of community and identifies that determined interference base station sends the resource of network-assist information on predetermined resource.
In step S205, first user equipment sends in the resource of network-assist information at determined interference base station, receives network-assist information based on predetermined transmission means from determined interference base station.Those network-assist informations comprise the public information of the interfered cell of determined interference base station and determined interference base station is the second Downlink Control Information that at least one second subscriber equipment produces.At this, it should be noted that the schedule information (Downlink Control Information) of not all subscriber equipment will be included in network-assist information.Network-assist information or only can should comprise those produce the surrounding user equipments of very large interference Downlink Control Information to first user equipment (being about to carry out disturbing the subscriber equipment eliminated).
Particularly, the public information of interfered cell such as comprises the schedule information of the configuration information of PSS/SSS, the configuration information of PBCH and/or EPDCCH.At this, preferably carry out transmission network supplementary with predetermined transmission means.Such as, base station and subscriber equipment appoint antenna port configuration and predetermined modulation system, thus subscriber equipment can successfully demodulate corresponding network-assist information.Such as can use antenna port 7 and 8 at this, and use QPSK modulation system.
In step S206, first user equipment is that the second Downlink Control Information that at least one second subscriber equipment produces carries out inter-cell interference cancellation based on the public information of the interfered cell of the first Downlink Control Information, determined interference base station and determined interference base station.
Fig. 4 shows the flow chart carrying out the method for inter-cell interference cancellation according to another embodiment of the invention.In this embodiment of the invention, network-assist information is sent by interfered cell.Will composition graphs 1, the flow chart of Fig. 4 is described.
In step S401, serving BS receives network-assist information from least one interference base station, and network-assist information comprises the public information of the interfered cell of interference base station and interference base station is the second Downlink Control Information that at least one second subscriber equipment produces.This transmitting procedure such as can be realized by X2 interface.
In step S402, it is the first Downlink Control Information that first user equipment produces that first user equipment receives serving BS from serving BS, and receives network-assist information based on predetermined transmission means from serving BS.
At this, similar with first embodiment, the public information that network-assist information comprises at least one interfered cell is the second Downlink Control Information that at least one second subscriber equipment produces with at least one interference base station.Similarly, also similar with first embodiment to the definition of predetermined transmission means and public information, be not described in detail in this.
Particularly, serving BS, by issuing its network-assist information based on each interference base station, produces new network-assist information, and sends it to first user equipment.Fig. 5 shows a kind of example format of network-assist information.As shown in Figure 5, suppose there is the network-assist information of 4 interfered cells.Wherein the network-assist information of the 4th interfered cell comprises n the forms interference Downlink Control Information of the second subscriber equipment and the public information of the 4th community to first user equipment.
In step 5403, subscriber equipment determines according to pre-defined rule the interference base station it being produced to interference, and this is also similar with the corresponding steps in first embodiment, is not described in detail in this.Thus preferably, subscriber equipment only receives from serving BS and obtains the network-assist information of the interference base station it being produced to severe jamming, for follow-up inter-cell interference cancellation.This such as also can be realized by staggering of cell ID.
Then, in step 5404, first user equipment is that the second Downlink Control Information that at least one second subscriber equipment produces carries out inter-cell interference cancellation based on the public information of the interfered cell of the first Downlink Control Information, determined interference base station and determined interference base station.
It should be noted that, above-described embodiment is only exemplary, but not limitation of the present invention.Any technical scheme not deviating from spirit of the present invention all should fall within protection scope of the present invention, and this comprises the different technologies feature that use occurs in different embodiments, and method can combine, to obtain beneficial effect.
Claims (15)
1. one kind is carried out the method for inter-cell interference cancellation in first user equipment, wherein, described first user equipment is administered by serving BS, and be subject to the potential interference of at least one the second subscriber equipment at least one interfered cell administered by least one interference base station, described method comprises the steps:
B. receiving described serving BS from described serving BS is the first Downlink Control Information that described first user equipment produces; and receive network-assist information based on predetermined transmission means from described at least one interference base station, described network-assist information comprises the public information of the interfered cell of interference base station and described interference base station is the second Downlink Control Information that at least one second subscriber equipment described produces; And
C. inter-cell interference cancellation is carried out based on the public information of described first Downlink Control Information, at least one interfered cell described and described second Downlink Control Information.
2. method according to claim 1, it is characterized in that, running time-frequency resource is reserved with predetermined resource transmit the network-assist information of at least one interference base station described, the resource wherein shared by each interference base station is mutually orthogonal, before step b, described method comprises step a:
A. receive indication information from described serving BS, it indicates the position of described predetermined resource on described running time-frequency resource; And, receive network-assist information based on predetermined transmission means from described at least one interference base station in described step b, described network-assist information comprises the public information of the interfered cell of interference base station and described interference base station is that the second Downlink Control Information that at least one second subscriber equipment described produces comprises further:
B1. determine according to pre-defined rule the interference base station described first user equipment being produced to interference;
B2., on described predetermined resource, staggered by the mark of community and identify that determined interference base station sends the resource of network-assist information; And
B3. send at determined interference base station in the resource of network-assist information, receive described network-assist information based on described predetermined transmission means from determined interference base station, described network-assist information comprises the public information of the interfered cell of determined interference base station and described determined interference base station is the second Downlink Control Information that at least one second subscriber equipment described produces.
3. method according to claim 1 and 2, is characterized in that, described predetermined transmission means comprises predetermined antenna port configuration and predetermined modulation system.
4. method according to claim 1 and 2, is characterized in that, the public information of described interfered cell comprises the configuration information of PSS/SSS, the configuration information of PBCH and/or the schedule information of EPDCCH.
5. method according to claim 2, is characterized in that, described pre-defined rule comprises: the measurement based on Reference Signal Received Power identifies the interference base station described first user equipment being produced to interference.
6. in the serving BS of administration first user equipment, assist described first user equipment to carry out the method for inter-cell interference cancellation for one kind, wherein, described first user equipment is subject to the potential interference of at least one the second subscriber equipment at least one interfered cell administered by least one interference base station, and wherein on running time-frequency resource, be reserved with predetermined resource transmit the network-assist information of at least one interference base station described, resource wherein shared by each interference base station is mutually orthogonal, and described method comprises the steps:
A. send indication information to described first user equipment, it indicates the position of described predetermined resource on described running time-frequency resource.
7. a method of assisting first user equipment to carry out inter-cell interference cancellation in interference base station, wherein, described interference base station administers at least one second subscriber equipment, at least one second subscriber equipment described produces potential interference to described first user equipment, described first user equipment is arranged in the community administered by serving BS, and on running time-frequency resource, be wherein reserved with predetermined resource to transmit the network-assist information of at least one interference base station, resource wherein shared by each interference base station is mutually orthogonal, and described method comprises the steps:
X1. in the resource shared by described interference base station, send network-assist information with predetermined transmission means to described first user equipment, described network-assist information comprises the public information of the interfered cell of described interference base station and described interference base station is the second Downlink Control Information that at least one second subscriber equipment described produces.
8. method according to claim 7, is characterized in that, described predetermined transmission means comprises predetermined antenna port configuration and predetermined modulation system.
9. method according to claim 7, is characterized in that, the public information of described interfered cell comprises the configuration information of PSS/SSS, the configuration information of PBCH and/or the schedule information of EPDCCH.
10. one kind is carried out the method for inter-cell interference cancellation in first user equipment, wherein, described first user equipment is administered by serving BS, and be subject to the potential interference of at least one the second subscriber equipment at least one interfered cell administered by least one interference base station, described method comprises the steps:
S1. receiving described serving BS from described serving BS is the first Downlink Control Information that described first user equipment produces; and receive network-assist information based on predetermined transmission means from described serving BS, the public information of at least one interfered cell described in described network-assist information comprises and at least one interference base station described are the second Downlink Control Information that at least one second subscriber equipment described produces; And
S2. inter-cell interference cancellation is carried out based on the public information of described first Downlink Control Information, at least one interfered cell described and described second Downlink Control Information.
11. methods according to claim 10, is characterized in that, described step S2 comprises further:
S21. determine according to pre-defined rule the interference base station it being produced to interference; And
S22. be that the second Downlink Control Information that at least one second subscriber equipment described produces carries out inter-cell interference cancellation based on the public information of the interfered cell of described first Downlink Control Information, determined interference base station and described determined interference base station.
12. methods according to claim 10 or 11, is characterized in that, described predetermined transmission means comprises predetermined antenna port configuration and predetermined modulation system.
13. methods according to claim 10 or 11, it is characterized in that, the public information of described interfered cell comprises the configuration information of PSS/SSS, the configuration information of PBCH and/or the schedule information of EPDCCH.
In the serving BS of administration first user equipment, described first user equipment is assisted to carry out the method for inter-cell interference cancellation for 14. 1 kinds, wherein, described first user equipment is subject to the potential interference of at least one the second subscriber equipment at least one interfered cell administered by least one interference base station, and described method comprises the steps:
I. receive network-assist information from described at least one interference base station, described network-assist information comprises the public information of the interfered cell of interference base station and described interference base station is the second Downlink Control Information that at least one second subscriber equipment described produces; And
Ii. sending described serving BS to described first user equipment is the first Downlink Control Information that described first user equipment produces, and sends described network-assist information based on predetermined transmission means to described first user equipment.
15. 1 kinds of methods of assisting first user equipment to carry out inter-cell interference cancellation in interference base station, wherein, described interference base station administers at least one second subscriber equipment, at least one second subscriber equipment described produces potential interference to described first user equipment, described first user equipment is arranged in the community administered by serving BS, and described method comprises the steps:
Send network-assist information to described serving BS, described network-assist information comprises the public information of the interfered cell of described interference base station and described interference base station is the second Downlink Control Information that at least one second subscriber equipment described produces.
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| CN201310413595.9A CN104469813B (en) | 2013-09-12 | 2013-09-12 | A method of carrying out inter-cell interference cancellation |
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| CN201310413595.9A CN104469813B (en) | 2013-09-12 | 2013-09-12 | A method of carrying out inter-cell interference cancellation |
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| WO2018196657A1 (en) * | 2017-04-24 | 2018-11-01 | 华为技术有限公司 | Interference cancellation method, user equipment, and network device |
| WO2020056761A1 (en) * | 2018-09-21 | 2020-03-26 | Qualcomm Incorporated | Victim interference mitigation in remote interference management frameworks |
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| WO2020056761A1 (en) * | 2018-09-21 | 2020-03-26 | Qualcomm Incorporated | Victim interference mitigation in remote interference management frameworks |
| WO2020057594A1 (en) * | 2018-09-21 | 2020-03-26 | Qualcomm Incorporated | Victim interference mitigation in remote interference management frameworks |
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| CN104469813B (en) | 2019-01-11 |
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