CN101043693A - Method and system for inter-cell eliminating interference - Google Patents
Method and system for inter-cell eliminating interference Download PDFInfo
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Abstract
The disclosed eliminating interference method comprises: BS divides local subzone into the central user and edge user according to UE signal; BS uses time slot appointed in configuration information to transmit data with both the center and edge users, wherein, the edge users of different subzone apply different time slot.
Description
Technical field
The present invention relates to the communications field, relate in particular to the method and system of eliminating interference in the minizone.
Background technology
Existing commercial wireless communication system can support the multi-user of uplink and downlink to insert.The up terminal that refers to sends data to the base station, and the descending base station that refers to sends data to terminal.Different users can be simultaneously and the base station communicate, the The data frequency division of different user, time-division or sign indicating number grading mode are multiplexing on a link, to guarantee that the channel of use is mutually orthogonal separately, that is to say can the phase mutual interference between each user.
Because the limited coverage area of each base station can be held more user in order to make system, usually radio communication coverage area is divided into sub-district one by one, usually each sub-district becomes hexagon, and each sub-district is adjacent, forms cellular, therefore be called cell mobile communication systems, as shown in Figure 1.
In cell mobile communication systems, each sub-district is with six sub-districts are adjacent on every side.If the user between neighbor cell uses identical frequency band to communicate simultaneously, will form mutual interference.The channel that is to say user's use of minizone is nonopiate.Usual way is that whole frequency band is divided into a plurality of subbands, and different subbands is used in each adjacent sub-district.Identical subband is used in non-conterminous sub-district, and in Fig. 1, subband 1 is used in sub-district 1, and subband 2 is used in sub-district 2,4,6, and subband 3 is used in sub-district 3,5,7.So just make the user of each neighbor cell on frequency, realize quadrature, thereby reduced mutual interference.But,, the frequency service efficiency of system is reduced greatly, thereby make the decreased performance of system because the part of whole frequency band has only been used in each sub-district for such system.
For the interference of minizone, wherein Zui Da interference comes from the interference between the edge customer of neighbor cell.Because this type of user is far away from the base station, base station and user need to strengthen transmitted power, so, bigger to the interference of neighbor cell.And this type of user is because channel quality is relatively poor, the signal that receives a little less than, the influence that is subjected to neighbor cell interference is also maximum.Therefore, how to improve the communication quality of Cell Edge User, become and improve the communication system overall performance, enlarge the key of each cell coverage area.
Provide the scheme of disturbing that solves in the prior art, as shown in Figure 2.In this scheme, in two kinds of zones of definition on the transmission time slot TTI: interference region (NICI zone) between low presence of intercell interference zone (LICI zone) and normal cell.The LICI zone accounts for several orthogonal frequency division multiplexing (OFDM) code element on time domain, use the partial frequency multiplexing technology in this zone, and promptly each neighbor cell is in the part of these moment using system whole frequency band, and frequency reuse is greater than 1.The NICI zone is the OFDM code element except LICI on the time domain, and in these zones, whole frequency band is used in each sub-district, and promptly frequency reuse is 1.In the LICI zone, owing to used partial frequency multiplexing technology (consulting Fig. 1), interference among adjacent cells is less, can give Cell Edge User with this region allocation, thereby improves the communication quality of Cell Edge User.That is to say that the data of Cell Edge User are transmitted in the time slot in LICI zone.Corresponding, the user of NICI region allocation center of housing estate uses.Because the distance between the user of the center of housing estate of neighbor cell is far away, mutual interference is less, so constantly can use whole frequency band communication at these, promptly frequency reuse is 1.
Though adopt technical scheme shown in Figure 2, the interference of minizone can be eliminated, but still the partial frequency multiplexing technology can't be avoided using, promptly when the LICI zone, the frequency reuse of system is greater than 1.Like this, just greatly reduce the frequency service efficiency of whole system.
Summary of the invention
The invention provides a kind of method and system of eliminate disturbing in the minizone, have the problem of using the partial frequency multiplexing technology when eliminating presence of intercell interference and influencing the frequency service efficiency of whole system in the prior art to solve.
The invention provides following technical scheme:
A kind of method of disturbing of eliminating in the minizone comprises the steps:
The base station is according to the coherent signal of subscriber equipment, and this community user is divided into two types of Cell Center User and Cell Edge User; And
Use the slot transmission data of appointment in the configuration information between Cell Center User in base station and this sub-district and the Cell Edge User, and for neighbor cell, the Cell Edge User in the different districts uses different slot transmission data.
Wherein:
The value of strong and weak value of the pilot signal by the user or other signals relevant with pilot signal and threshold ratio are divided into Cell Center User and Cell Edge User with the user.
Regularly announce the Cell Edge User situation between the adjacent base station, and adjust the number of timeslots that Cell Edge User uses according to cell edge number of users amplitude of variation in the neighbor cell.
In each base station, adopt user's time division multiplexing table to specify the Cell Center User and the employed time slot of Cell Edge User of this sub-district, and the time slot that specified Cell Edge User uses in each user's time division multiplexing table of neighbor cell is inequality.
Comprise step when sending downlink data:
The base station is divided into two types of Cell Edge User packet and Cell Center User packets with user data package to be sent; The user type of current time slots is determined to use in the base station according to configuration information; And the base station is selected the user data of respective type to wrap in the current time slots from packet to be sent to send.
Emission function is adjusted in the base station when sending dissimilar user data package, make the transmission Cell Edge User count the power of bag greater than the power that sends the Cell Center User packet.
Subscriber equipment is handed down to the time slot of specifying Cell Edge User and Cell Center User to use in the configuration information in the base station, and the user sends upstream data at corresponding time slot.
A kind of communication system comprises a plurality of base station equipments that are used to carry out RRM; Described base station equipment comprises:
Be used to preserve user's time division multiplexing table, definition has Cell Edge User or the employed time slot of Cell Center User in this table, and the time slot device inequality that the definition Cell Edge User uses in each user's time division multiplexing table of neighbor cell;
Be used for belonging to Cell Edge User or Cell Center User, user data package to be sent is divided into Cell Edge User packet and Cell Center User packet two kind of means according to the user;
Be used for determining the type of the user data package that current time slots should send, and from packet to be sent, select the device of the user data package of respective type according to current time slots search index user time division multiplexing table;
Be used for device in the user data package of current time slots emission selection.
Described base station equipment also comprises: be used to inquire about described user's time division multiplexing table, obtain the employed time slot of Cell Edge User and Cell Center User respectively and distribute to the device of corresponding user equipment.
A kind of communication system comprises a plurality of base station equipments that are used to carry out RRM; Described base station equipment comprises:
Be used to preserve user's time division multiplexing table, definition has Cell Edge User or the employed time slot of Cell Center User in this table, and the time slot device inequality that the definition Cell Edge User uses in each user's time division multiplexing table of neighbor cell;
Be used to inquire about described user's time division multiplexing table, obtain the employed time slot of Cell Edge User and Cell Center User respectively and distribute to the device of corresponding user equipment.
Beneficial effect of the present invention is as follows:
The present invention is between neighbor cell, use different time slots to transmit data for edge customer, guaranteeing that the whole system frequency repeat utilization ratio is under 1 the prerequisite, reduce the phase mutual interference between the neighbor cell edge customer greatly, improved the communication quality of Cell Edge User and the overall performance of whole communication system.
Description of drawings
Fig. 1 is the cellular cell schematic diagram of frequency division multiplexing in the prior art;
Fig. 2 is a time-multiplexed schematic diagram in the prior art;
Fig. 3 is the flow chart that sends downlink data in the embodiment of the invention;
Fig. 4 is the structural representation of base station in the embodiment of the invention;
Fig. 5 is a cellular cell border distribution schematic diagram in the embodiment of the invention;
Fig. 6 A, 6B, 6C are the edge/central user time division multiplexing schematic diagram of each sub-district in the embodiment of the invention.
Embodiment
In the sub-district that a base station node B is covered, for, channel quality nearer from serving BS user preferably, base station and subscriber equipment all can adopt lower transmitting power, and this moment, this sub-district was less to the co-channel interference of neighbor cell on every side; For the far away or relatively poor user of channel quality from serving BS, base station and subscriber equipment all need to use higher transmitting power, and at this moment, the co-channel interference that neighbor cell is on every side caused is bigger.
In order to reduce interference among adjacent cells and to improve the reusability of system frequency, among the present invention community user is divided into two types of Cell Center User and Cell Edge User, for adjacent sub-district, Cell Edge User in the different districts uses different slot transmission data, and the Cell Edge User that is about to neighbor cell staggers on time slot mutually.
To the differentiation of Cell Center User in the sub-district and Cell Edge User, can be by measure this user's pilot signal power at reverse link, perhaps measure the pilot tone power of sub-district by this user, and this feedback information is realized to the base station at forward link.Cell base station can directly come the user is sorted according to user's pilot signal power, and by with the value of pilot signal power and threshold ratio, the user who the value of pilot signal power is lower than threshold value is divided into Cell Edge User, and remaining user is divided into Cell Center User.In addition, the base station also can utilize other signals relevant with pilot signal to differentiate Cell Center User and Cell Edge User, as utilizing the signal to noise ratio that obtains according to the pilot signal power or channel quality information CQI etc.
The time slot of specifying this Cell Center User and Cell Edge User to use at the configuration information of the base station of each sub-district.A kind of preferable mode is to set up user's time division multiplexing table in the base station, the time slot that difference designated cell central user and Cell Edge User use in table.The foundation of time division multiplexing table, need each sub-district to coordinate to determine according to the situation of neighbor cell, for neighbor cell, the time slot that specified Cell Edge User uses in user's time division multiplexing table of different districts is inequality, and the time slot that is about to the Cell Edge User use of neighbor cell staggers mutually.When can setting up in system, the foundation of the time division multiplexing table of each base station forms.
Table one and table two have provided the signal of user's time division multiplexing table of adjacent sub-district A and sub-district B respectively, in the A of sub-district, use time slot 1 to send data between Cell Edge User and the base station, and in the B of sub-district, use time slot 3 to send data (certainly, Cell Edge User also can use time slot 2 in the B of sub-district with regard to these two sub-districts) between Cell Edge User and the base station.That is to say that when the base station of sub-district A used time slot 1 concentrated Cell Edge User in this sub-district to send information, its neighbor cell B can only send data to the Cell Center User of this sub-district in this time slot.
Table one (sub-district A)
| The | 1 | 2 | 3 |
| User type | Cell Edge User | Cell Center User | Cell Center User |
Table two (sub-district B)
| The | 1 | 2 | 3 |
| User type | Cell Center User | Cell Center User | Cell Edge User |
Because the mobile meeting of subscriber equipment changes Cell Center User and Cell Edge User, therefore, the base station can be regularly redistricts user type according to user's pilot signal power.Further, in order to adjust cell load, regularly announce the Cell Edge User situation between the adjacent base station, the number of timeslots that Cell Edge User uses can be adjusted automatically according to cell edge number of users amplitude of variation in the neighbor cell in the base station.For example, after the quantity situation through neighbor cell announcement Cell Edge User, the Cell Edge User number of one of them sub-district increases more (can judge by given threshold value), the timeslot number that this Cell Edge User of then corresponding increase uses, as being increased to two time slots from an original time slot, but after carrying out the time slot adjustment, the time slot of the Cell Edge User use of neighbor cell is staggered mutually.
The base station is when sending downlink data, can be according to the difference of user type, packet to be sent is divided into two types of Cell Edge User packet and Cell Center User packets, determine by inquiring user time division multiplexing table current time slots by which kind of user type is used then, and select the packet of respective type.Division for packet, the pilot signal power of packet according to affiliated user can be sorted, a part of packet that affiliated user's pilot signal is more weak is divided into the Cell Edge User packet, and remaining packet is divided into the Cell Center User packet.
Consult shown in Figure 3ly, the process that the base station sends downlink data is as follows:
In step 300, classify to sent user data package in the base station, and it is divided into Cell Edge User packet and Cell Center User packet; In step 310, inquiring user time division multiplexing table, definite user type of using current time slots; In step 320, select the user data package of respective type according to the user type of using current time slots; In step 330, the emission user data package.
A kind of architecture of base station in the present embodiment as shown in Figure 4, the base station also comprises taxon 11, first memory cell 12, second memory cell 13, the 3rd memory cell 17 and packet selected cell 14 except comprising existing coded/modulated unit 10, map unit 15 and contrary fast Flourier IFFT converter unit 16 and antenna 20.
Taxon 11 is used for the packet after the coded/modulated is divided into Cell Edge User packet and Cell Center User packet, the Cell Edge User packet is saved in first memory cell 12, the Cell Center User packet is saved in second memory cell 13; The 3rd memory cell 17 is used to preserve user's time division multiplexing table of this sub-district; Packet selected cell 14 determines from the 3rd memory cell 17 inquiring user time division multiplexing tables current time slots by which kind of user type is used, and selects the packet and the output of respective type from first memory cell 13 or second memory cell 13; 14 pairs of data of map unit are carried out the mapping of orthogonal frequency division multiplexed OFDM carrier wave; 16 pairs of carrier waves of IFFT converter unit are modulated, and by the carrier wave after the antenna 20 transmission modulation.
Subscriber equipment constantly carries out demodulating and decoding to data corresponding, and its processing mode is same as the prior art.
For up link, the base station is according to the type under the user (being Cell Edge User or Cell Center User) inquiring user time division multiplexing table, for the up channel of subscriber equipment distributes corresponding time slot, and by controlling transmitting signaling downwards to subscriber equipment, then, subscriber equipment sends data to the base station in the time slot of regulation.Accordingly, comprise that in the base station is used for an inquiring user time division multiplexing table, obtain the employed time slot of Cell Edge User and Cell Center User respectively and be handed down to the functional unit of subscriber equipment.
Said method can use on down link separately, also can use on up link separately, but best mode is all to adopt said method at down link and up link.
Below further specify technical scheme of the present invention by an example, this embodiment also is not used in qualification the present invention.
Fig. 5 is a typical hexagon cellular cell border schematic diagram, and wherein each sub-district is adjacent with six sub-districts.The user who is in cell edge is subjected to the interference of two neighbor cells at most, and as the user of the stain position of 1,3,4 three the sub-district intersections in sub-district among this figure, the Serving cell of supposing it is sub-district 1.When the base station communication of this user and sub-district 1, can be subjected to the interference of the signal of the base station of sub-district 3,4 or user's emission.
Table three, table four and table five have provided user's time division multiplexing table of each sub-district respectively, can find out from three user's time-division utilization tables, and the Cell Edge User of neighbor cell uses different time slots.Cell Edge User as sub-district 1 uses time slot 1, and the Cell Edge User of sub-district 3 uses time slot 3, and the Cell Edge User of sub-district 4 uses time slot 2.These three time slots are interlaced, do not cover between mutually.
Table three (the time division multiplexing table of sub-district 1)
| The | 1 | 2 | 3 |
| OFDM notation index in the corresponding subframe | 1st, 2 code elements | 3rd, 4 code elements | 5th, 6 code elements |
| User type | Cell Edge User | Cell Center User | Cell Center User |
Table four (the time division multiplexing table of sub-district 3,5,7)
| The | 1 | 2 | 3 |
| OFDM notation index in the corresponding subframe | 1st, 2 code elements | 3rd, 4 code elements | 5th, 6 code elements |
| User type | Cell Center User | Cell Edge User | Cell Center User |
Table five (the time division multiplexing table of sub-district 2,4,67)
| The | 1 | 2 | 3 |
| OFDM notation index in the corresponding subframe | 1st, 2 code elements | 3rd, 4 code elements | 5th, 6 code elements |
| User type | Cell Center User | Cell Center User | Cell Edge User |
Consult shown in Fig. 6 A, 6B, the 6C, suppose that a subframe is made up of 6 OFDM code elements, time slot 1 is defined as the 1st and the 2nd OFDM code element, communicate by letter with Cell Edge User when sending the 1st, 2 two OFDM code element of each subframe in the base station that is sub-district 1, and other constantly be in Cell Center User and communicate by letter.Frame synchronization between each sub-district.Time slot 2 is defined as the 3rd and the 4th OFDM code element of each subframe, and promptly the base station of sub-district 3,5,7 is the 3rd communicating by letter with Cell Edge User during with the 4th OFDM code element of sending each frame, and other are communicated by letter with the Cell Center User of sub-district separately base stations constantly.The definition of time slot 3 is similar.From the above, when the Cell Edge User of Serving cell and neighbor cell and Cell Center User adopted multiplexing pattern among figure Fig. 6 A, 6B, the 6C, the time slot of the Cell Edge User of each neighbor cell with base station communication the time staggered mutually.That is to say that when wherein the Cell Edge User of certain sub-district is with its base station communication, only communicate by letter with the Cell Center User of this sub-district in the base station of its neighbor cell.Because neighbor cell is only communicated by letter with the Cell Center User of this sub-district, its quality of channel is better, and therefore, the base station can reduce transmitting power, guarantees this quality of services for users QoS simultaneously.Like this, less to the interference that the Cell Edge User of current area causes, thus improved the communication quality of Cell Edge User.As shown in figure Fig. 6 A, 6B, 6C, communicate by letter with its Cell Edge User at time slot 1 in the base station of sub-district 1, and only communicate by letter with the Cell Center User of this sub-district when time slot 1 in the base station of sub-district 2,3,4,5,6,7.Therefore, the Cell Edge User of sub-district 1 is subjected to the interference reduction of the base station of sub-district 2,3,4,5,6,7, thereby has improved the communication quality of the Cell Edge User of sub-district 1.Because when adopting this technology, no matter be Cell Edge User, or Cell Center User, its channeling all is 1, has improved the utilance of frequency spectrum like this.And adopt this technology, the Cell Edge User communication quality is improved, and Cell Center User is unaffected, therefore, can increase substantially the overall performance of system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1, a kind of method of disturbing of eliminating in the minizone is characterized in that, comprises the steps:
The base station is according to the coherent signal of subscriber equipment, and this community user is divided into two types of Cell Center User and Cell Edge User; And
Use the slot transmission data of appointment in the configuration information between Cell Center User in base station and this sub-district and the Cell Edge User, and for neighbor cell, the Cell Edge User in the different districts uses different slot transmission data.
2, the method for claim 1 is characterized in that, the value of strong and weak value of the pilot signal by the user or other signals relevant with pilot signal and threshold ratio are divided into Cell Center User and Cell Edge User with the user.
3, the method for claim 1 is characterized in that, regularly announces the Cell Edge User situation between the adjacent base station, and adjusts the number of timeslots that Cell Edge User uses according to cell edge number of users amplitude of variation in the neighbor cell.
4, the method for claim 1, in each base station, adopt user's time division multiplexing table to specify the Cell Center User and the employed time slot of Cell Edge User of this sub-district, and the time slot that specified Cell Edge User uses in each user's time division multiplexing table of neighbor cell is inequality.
5, as each described method of claim 1 to 4, it is characterized in that the base station comprises step when the user sends downlink data:
The base station is divided into two types of Cell Edge User packet and Cell Center User packets with user data package to be sent;
The user type of current time slots is determined to use in the base station according to configuration information; And
The base station is selected the user data of respective type to wrap in the current time slots from packet to be sent to send.
6, method as claimed in claim 5 is characterized in that, emission function is adjusted in the base station when sending dissimilar user data package, makes the transmission Cell Edge User count the power of bag greater than the power that sends the Cell Center User packet.
As each described method of claim 1 to 4, it is characterized in that 7, subscriber equipment is handed down to the time slot of specifying Cell Edge User and Cell Center User to use in the configuration information in the base station, the user sends upstream data at corresponding time slot.
8, a kind of communication system comprises a plurality of base station equipments that are used to carry out RRM; It is characterized in that described base station equipment comprises:
Be used to preserve user's time division multiplexing table, definition has Cell Edge User or the employed time slot of Cell Center User in this table, and the time slot device inequality that the definition Cell Edge User uses in each user's time division multiplexing table of neighbor cell;
Be used for belonging to Cell Edge User or Cell Center User, user data package to be sent is divided into Cell Edge User packet and Cell Center User packet two kind of means according to the user;
Be used for determining the type of the user data package that current time slots should send, and from packet to be sent, select the device of the user data package of respective type according to current time slots search index user time division multiplexing table;
Be used for device in the user data package of current time slots emission selection.
9, communication system as claimed in claim 8 is characterized in that, described base station equipment also comprises:
Be used to inquire about described user's time division multiplexing table, obtain the employed time slot of Cell Edge User and Cell Center User respectively and be handed down to the device of corresponding user equipment.
10, a kind of communication system comprises a plurality of base station equipments that are used to carry out RRM; It is characterized in that described base station equipment comprises:
Be used to preserve user's time division multiplexing table, definition has Cell Edge User or the employed time slot of Cell Center User in this table, and the time slot device inequality that the definition Cell Edge User uses in each user's time division multiplexing table of neighbor cell;
Be used to inquire about described user's time division multiplexing table, obtain the employed time slot of Cell Edge User and Cell Center User respectively and be handed down to the device of corresponding user equipment.
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