CN101827063B - Frequency multiplexing device and method of OFDMA (Orthogonal Frequency Division Multiplexing Access) system - Google Patents
Frequency multiplexing device and method of OFDMA (Orthogonal Frequency Division Multiplexing Access) system Download PDFInfo
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- CN101827063B CN101827063B CN201010143062XA CN201010143062A CN101827063B CN 101827063 B CN101827063 B CN 101827063B CN 201010143062X A CN201010143062X A CN 201010143062XA CN 201010143062 A CN201010143062 A CN 201010143062A CN 101827063 B CN101827063 B CN 101827063B
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Abstract
The invention relates to frequency multiplexing device and method of an OFDMA (Orthogonal Frequency Division Multiplexing Access) system. The device comprises a terminal side dynamic spectrum assignment module and a network side dynamic spectrum assignment module, wherein the terminal side dynamic spectrum assignment module is arranged at the side of a system terminal and used for generating a service requiring to setting a bandwidth, simultaneously detecting the interfered conditions of cells and transmitting the bandwidth requirement, channel information and interference information to the network side dynamic spectrum assignment module; and the network side dynamic spectrum assignment module is arranged at the network side and used for respectively dividing a cell edge group and a cell center group into a cell edge carrier subgroup and a cell center carrier subgroup according to the information of the terminal side dynamic spectrum assignment module and the interference grades of adjacent cells and generating subcarrier scheduling information. The system and the method can guarantee the performance of edge users, improve the utilization ratio of the frequency and can be subjected to dynamical adjustment according to the interference degrees among the cells to reduce the interference to the edge users.
Description
Technical field
The present invention relates to the mobile wireless network technical field, relate in particular to the channeling device and method of a kind of OFDMA system.
Background technology
OFDMA (Orthogonal Frequency Division Multiple Access, OFDM) is as a kind of multi-access mode, can make system at frequency domain and time domain two dimension scheduling resource flexibly, improves the flexibility and the validity of the utilization of resources.The OFDMA system designs for higher data transmission rate; Through using frequency band and time slot in the orthogonal sub-carriers to come dispatching patcher resource flexibly; The system that makes can obtain bigger multi-user and multi-frequency gain, and this system does not receive the influence of frequency selective fading basically in addition, and has the characteristics of spectral efficient and easy autgmentability; Be particularly suitable for wide-band communication system, the OFDMA network will become part and parcel in following broadband wireless network and the cordless communication network undoubtedly.Based on above reason, many normal structures or will be the OFDMA technology part as transmission technology in its wireless transmission standards.
(Inter-cell Interference ICI) is an intrinsic problem of cell mobile communication systems to presence of intercell interference, and The traditional solution is to adopt channeling, and reuse has only specific several selections, as 1,3,7 etc.Reuse is 1 to represent that promptly neighbor cell all uses identical frequency resource, at this moment disturbs very serious at cell edge.Higher reuse (3 or 7) can suppress ICI effectively, but spectrum efficiency will be reduced to 1/3 or 1/7.Following wide-band mobile communication system is very high to the requirement of spectrum efficiency, therefore hopes that the spectrum reuse coefficient is as much as possible near 1.
Though the OFDMA system has guaranteed the orthogonality between the user in the sub-district, can not well realize the minizone multiple access.Identical frequency is all used in each sub-district, and the user of cell edge exists very strong same frequency to disturb, and performance sharply descends.Therefore, though the OFDMA technology can solve the problem of disturbing in the sub-district better than CDMA technology, as cost, the ICI problem that the OFDMA system brings maybe be more serious than cdma system.If two neighbor cells use identical frequency spectrum resource in their joint portion, then can produce stronger ICI, influence the user and use.If do not take any additional designs, system will face serious presence of intercell interference.So design one not only can improve the frequency service efficiency simultaneously but also the channeling structure that can alleviate presence of intercell interference in the system be a problem demanding prompt solution.
Many mechanism of dealing with problems have been proposed at present.For example, partial frequency multiplexing (FFR), soft-frequency reuse (SFR).In the middle of these mechanism, the use of soft-frequency reuse is the most extensive, yet the frequency efficiency of cell edge is very low in the soft-frequency reuse system, and the resource that major part is assigned to is not used.
A kind of fractional frequency reuse cell structure has been proposed in the existing research, as shown in Figure 1.In the OFDMA system, the subcarrier that frequency range will be divided into some uses (arrow as among the figure is represented a number of sub-carrier).For these subcarriers, this structure will be divided into the cell edge group and the center of housing estate group is used for two groups, and they are with fringe region that is used in the sub-district respectively and central area.The cell edge group further is divided into cell edge group 1, cell edge group 2 and 3 three son groups of cell edge group, respectively by as figure in right slanted bar line, left slanted bar line and tiltedly check partly represent.This structure can reduce the interference of minizone significantly, yet center of housing estate and the frequency band division between cell edge in the structure are independently, and the subcarrier that causes each group freely to select reduces, thereby has influenced multi-user diversity and multicarrier gain.For wide-band communication system, low frequency efficiency will directly bring the minimizing of throughput of system and supporting business amount, thereby reduce the performance of influence.In addition, this structure is not generally supported dynamically to adjust frequency according to the presence of intercell interference situation and is used set.Use the method for set though also exist some supports dynamically to adjust frequency according to the presence of intercell interference situation in the prior art, required Signalling exchange is bigger, and practicality is not strong.
Summary of the invention
The technical problem that (one) will solve
The technical problem that the present invention will solve is: guarantee the performance of edge customer, the utilance of raising frequency, can adjust, reduce the suffered interference of edge customer dynamically according to the annoyance level of minizone simultaneously.
(2) technical scheme
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
The invention provides the channeling device of a kind of OFDMA system; This device comprises: end side dynamic frequency spectrum deployment module; Be positioned at the system terminal side; Be used for generating the business that needs are set bandwidth according to customer requirements, detected cells receives disturbed condition simultaneously, and bandwidth demand, channel information and interfere information are sent to network side dynamic frequency spectrum deployment module; Network side dynamic frequency spectrum deployment module; Be positioned at the grid side; Be used for according to information from said end side dynamic frequency spectrum deployment module; And the level of interference of neighbor cell is divided into cell edge carrier wave group and center of housing estate carrier wave group with cell edge group and center of housing estate group respectively, and generates the subcarrier schedule information.
Wherein, Said end side dynamic frequency spectrum deployment module comprises: send out/receive end unit; Be used for bandwidth demand, channel information and interfere information are sent to said network side dynamic frequency spectrum deployment module, and receive the schedule information that said network side dynamic frequency spectrum deployment module is sent; Business provides the unit, is used for generating the business that needs are set bandwidth according to customer requirements; Channel measurement unit is used for obtaining its channel information at full frequency band through the decoding downlink reference signal; The interferometry unit is used to detect the disturbed condition that this terminal receives neighbor cell.
Wherein, Said network side dynamic frequency spectrum deployment module comprises: receive/make a start the unit; Be used for schedule information is sent to said end side dynamic frequency spectrum deployment module, and receive bandwidth demand, channel information and the interfere information that said end side dynamic frequency spectrum deployment module is sent; The interference assessment unit is used to generate the suffered level of interference information in this sub-district, and sends it to neighbor cell, receives the suffered level of interference information of said neighbor cell from neighbor cell; The carrier set generation unit is used for according to the suffered level of interference information of neighbor cell, generates cell edge carrier wave group and center of housing estate carrier wave group; Sub-carrier allocation unit is used for according to child group of carrier wave, channel information and bandwidth demand information distribution subcarrier; The Information Statistics unit, the channel conditions and the bandwidth that are used to add up each terminal satisfy situation.
Wherein, the method comprising the steps of:
S1. system initialization is provided with the subcarrier counter initial value i=0 of Information Statistics unit, and wherein, 0≤i≤N, N are the number of subcarrier;
The carrier set of S2. having the right to use according to each carrier wave group, inquiry have the right to use the carrier wave group of i number of sub-carrier;
S3. the Information Statistics unit calculates the priority at each terminal in said each carrier wave group according to setup parameter;
S4. sub-carrier allocation unit is distributed to the highest terminal of priority with the i number of sub-carrier;
Whether the subcarrier counter values of S5. judging said Information Statistics unit reaches maximum, if reach, then finishes to distribute, and generate schedule information, otherwise rolling counters forward adds 1, and returns execution in step S2.
Wherein, the carrier set that each carrier wave group has the right to use among the said step S2 generates according to following method:
A1. receive/make a start the interference assessment information of unit reception of neighboring cell, and send it to the interference assessment unit;
A2. the grade factor is kept out of the way according to the level of interference of neighbor cell and said interference assessment information setting subcarrier in said interference assessment unit;
A3. network side dynamic frequency spectrum deployment module is according to the said ratio of keeping out of the way of keeping out of the way grade factor calculation center of housing estate carrier wave group;
A4. the carrier set generation unit is selected the subcarrier of keeping out of the way according to the ratio of keeping out of the way of said subcarrier group;
A5. the carrier set generation unit generates the subcarrier set that center of housing estate carrier wave is organized and cell edge carrier wave group has the right to use respectively according to the selection result of steps A 4.
(3) beneficial effect
Device and method of the present invention uses through whole usable frequencies being belonged to two groups of cell edge group and center of housing estate group, reaches the minimizing presence of intercell interference, guarantees the target of high-frequency utilance simultaneously.Edge group and central. set all have whole frequencies, have improved the quantity of the available frequency of user of using these groups greatly, thereby have improved the multi-user diversity of system and the throughput of multicarrier diversity gain and system.The present invention also supports the disturbance state according to the minizone, dynamically adjusts the frequency sets of center of housing estate group, effectively controls presence of intercell interference, guarantees the performance of edge customer.
Description of drawings
Fig. 1 is existing fractional frequency reuse cell structure;
Fig. 2 is the channeling cell structure according to the OFDMA system of one embodiment of the present invention;
Fig. 3 is the channeling apparatus structure sketch map according to the OFDMA system of one embodiment of the present invention;
Fig. 4 is the frequency multiplexing method flow chart according to the OFDMA system of one embodiment of the present invention;
Fig. 5 is the allocation flow figure that organizes the subcarrier of having the right to use according to each carrier wave in the frequency multiplexing method of the OFDMA system of one embodiment of the present invention.
Embodiment
The channeling device and method of the OFDMA system that the present invention proposes specifies as follows in conjunction with accompanying drawing and embodiment.
According to the channeling device of the OFDMA system of one embodiment of the present invention and use the assignment problem that solves the sub-carrier frequencies in the down link multi-cell OFDMA system; Realize through channeling structure shown in Figure 2; In system and method for the present invention; Cell edge group and center of housing estate group whole subcarrier of all can having the right to use; The center of housing estate group can also be divided into three son groups and come independent the use, and three son groups have the right to use most subcarrier, and concrete scope is by the carrier set generation unit decision of network side dynamic frequency spectrum deployment module.In the scheduling of resource of reality, the decision of the sub-carrier allocation unit of network side dynamic frequency spectrum deployment module is in each scheduling, and each subcarrier uses (result who has represented primary distribution like the arrow among the figure) by which son group.As shown in Figure 3, the channeling device of accordinging to the OFDMA system of one embodiment of the present invention comprises:
End side dynamic frequency spectrum deployment module; Be positioned at the system terminal side; The realization of inside modules had both utilized the existing function of terminal inner, had also proposed some new functions, was used to generate the business of the certain bandwidth of needs; Detected cells receives disturbed condition simultaneously, and bandwidth demand, channel information and interfere information are sent to network side dynamic frequency spectrum deployment module;
Network side dynamic frequency spectrum deployment module; Be positioned at network (such as the base station) side; The realization of inside modules had both utilized the existing function of terminal inner, had also proposed some new functions, was used for according to the information from end side dynamic frequency spectrum deployment module; And the level of interference of neighbor cell is divided into cell edge carrier wave group and center of housing estate carrier wave group with cell edge group and center of housing estate group respectively, and the generation schedule information.
Wherein, end side dynamic frequency spectrum deployment module comprises:
Send out/receive end unit, existing capability is used for bandwidth demand, channel information and interfere information are sent to network side dynamic frequency spectrum deployment module, and receives the signaling informations such as scheduling that network side dynamic frequency spectrum deployment module is sent;
Business provides the unit, and existing capability is used for the business according to the certain bandwidth of customer requirements generation needs;
Channel measurement unit, existing capability is used for obtaining its channel information at full frequency band through the decoding downlink reference signal;
The interferometry unit, new function is used to detect the disturbed condition that this terminal receives neighbor cell.
Network side dynamic frequency spectrum deployment module comprises:
Receive/make a start the unit, be used for signaling informations such as scheduling are sent to end side dynamic frequency spectrum deployment module, and bandwidth demand, channel information and the interfere information of the transmission of receiving terminal side dynamic frequency spectrum deployment module;
The interference assessment unit, new functional unit is responsible for generating the suffered level of interference information in this sub-district, and is sent it to neighbor cell, from the suffered level of interference information of neighbor cell reception of neighboring cell;
The carrier set generation unit, new functional unit is used for according to the suffered level of interference information of neighbor cell, generates cell edge carrier wave group and center of housing estate carrier wave group;
Sub-carrier allocation unit, new functional module is used for satisfying the situation allocation of subcarriers according to the channel conditions and the bandwidth at carrier set, terminal;
The Information Statistics unit, new functional module, the channel conditions and the bandwidth that are used to add up each terminal satisfy situation.
Based on the frequency multiplexing method of the OFDMA system of said apparatus, on the basis that cooperatively interacts of above plurality of units, concrete environment is operation down, and as shown in Figure 4, the method comprising the steps of:
S1. system initialization, network side dynamic frequency spectrum deployment module is provided with the initial value i=0 of the subcarrier counter of Information Statistics unit, the beginning subcarrier allocation, wherein, 0≤i≤N, N are the number of subcarrier;
The subcarrier set of S2. having the right to use according to each carrier wave group, inquiry have the right to use the carrier wave group of i number of sub-carrier;
S3. the Information Statistics unit calculates the sub priority of organizing interior each terminal of each carrier wave of having the right to use this subcarrier according to setup parameter;
S4. sub-carrier allocation unit is distributed to the highest terminal of priority with the i number of sub-carrier;
Whether the numerical value of S5. judging the subcarrier counter of Information Statistics unit reaches maximum N, if reach, then finishes to distribute, and generate schedule information, otherwise rolling counters forward adds 1, and returns execution in step S2.
How to have determined the carrier wave of this sub-district is distributed through above-mentioned steps S1-S5, use at some terminals of promptly in actual use the i number of sub-carrier being distributed in the carrier wave group of having the right to use this subcarrier.
Wherein, The carrier set that each carrier wave group has the right to use among the said step S2; Confirming promptly that also each subcarrier can be used by those carrier wave groups, is network side sub-district and the sub-district concrete condition according to presence of intercell interference grade and this sub-district, generates according to method as shown in Figure 5:
A1. receive/make a start the interference assessment information of unit reception of neighboring cell, and send it to the interference assessment unit;
A2. the grade factor is kept out of the way according to the level of interference of neighbor cell and said interference assessment information setting subcarrier in said interference assessment unit;
A3. network side dynamic frequency spectrum deployment module is according to the said ratio of keeping out of the way of keeping out of the way grade factor calculation center of housing estate carrier wave group;
A4. the carrier set generation unit is selected the suitable subcarrier of keeping out of the way according to the ratio of keeping out of the way of said subcarrier group;
A5. the carrier set generation unit generates the subcarrier set that center of housing estate carrier wave is organized and cell edge carrier wave group has the right to use respectively according to the selection result of steps A 4; Wherein, The subcarrier that cell edge carrier wave group has the right to use is fixed; Fixedly be divided into three carrier wave groups according to cell edge, it respectively uses 1/3 carrier frequency.
Channeling structure in the application of the invention, each subcarrier is owned by a plurality of carrier wave groups, and the use of subcarrier is more careful, can make full use of the multicarrier gain.Simultaneously, each cell edge area and frequency (sub carrier group) quadrature that the neighbor cell edge uses have guaranteed the annoyance level of border district.Introduce the throughput that frequency repeat utilization ratio and system can be improved in many sectors.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (2)
1. the channeling device of an OFDMA system, this device comprises:
End side dynamic frequency spectrum deployment module; Be positioned at the system terminal side; Be used for generating the business that needs are set bandwidth according to customer requirements, detected cells receives disturbed condition simultaneously, and bandwidth demand, channel information and interfere information are sent to network side dynamic frequency spectrum deployment module;
Network side dynamic frequency spectrum deployment module; Be positioned at the grid side; Be used for according to information from said end side dynamic frequency spectrum deployment module; And the level of interference of neighbor cell is divided into cell edge carrier wave group and center of housing estate carrier wave group with cell edge group and center of housing estate group respectively, and generates the subcarrier schedule information;
Said end side dynamic frequency spectrum deployment module comprises:
Send out/receive end unit, be used for bandwidth demand, channel information and interfere information are sent to said network side dynamic frequency spectrum deployment module, and receive the schedule information that said network side dynamic frequency spectrum deployment module is sent;
Business provides the unit, is used for generating the business that needs are set bandwidth according to customer requirements;
Channel measurement unit is used for obtaining its channel information at full frequency band through the decoding downlink reference signal;
The interferometry unit is used to detect the disturbed condition that this terminal receives neighbor cell;
Said network side dynamic frequency spectrum deployment module comprises:
Receive/make a start the unit, be used for schedule information is sent to said end side dynamic frequency spectrum deployment module, and receive bandwidth demand, channel information and the interfere information that said end side dynamic frequency spectrum deployment module is sent;
The interference assessment unit is used to generate the suffered level of interference information in this sub-district, and sends it to neighbor cell, receives the suffered level of interference information of said neighbor cell from neighbor cell;
The carrier set generation unit is used for according to the suffered level of interference information of neighbor cell, generates cell edge carrier wave group and center of housing estate carrier wave group;
Sub-carrier allocation unit is used for according to child group of carrier wave, channel information and bandwidth demand information distribution subcarrier;
The Information Statistics unit, the channel conditions and the bandwidth that are used to add up each terminal satisfy situation.
2. based on the frequency multiplexing method of the OFDMA system of the said device of claim 1, it is characterized in that the method comprising the steps of:
S1. system initialization is provided with the subcarrier counter initial value i=0 of Information Statistics unit, and wherein, 0≤i≤N, N are the number of subcarrier;
The carrier set of S2. having the right to use according to each carrier wave group, inquiry have the right to use the carrier wave group of i number of sub-carrier;
S3. the Information Statistics unit calculates the priority at each terminal in said each carrier wave group according to setup parameter;
S4. sub-carrier allocation unit is distributed to the highest terminal of priority with the i number of sub-carrier;
Whether the subcarrier counter values of S5. judging said Information Statistics unit reaches maximum, if reach, then finishes to distribute, and generate schedule information, otherwise rolling counters forward adds 1, and returns execution in step S2;
The carrier set that each carrier wave group has the right to use among the said step S2 generates according to following method:
A1. receive/make a start the interference assessment information of unit reception of neighboring cell, and send it to the interference assessment unit;
A2. the grade factor is kept out of the way according to the level of interference of neighbor cell and said interference assessment information setting subcarrier in said interference assessment unit;
A3. network side dynamic frequency spectrum deployment module is according to the said ratio of keeping out of the way of keeping out of the way grade factor calculation center of housing estate carrier wave group;
A4. the carrier set generation unit is selected the subcarrier of keeping out of the way according to the ratio of keeping out of the way of said subcarrier group;
A5. the carrier set generation unit generates the subcarrier set that center of housing estate carrier wave is organized and cell edge carrier wave group has the right to use respectively according to the selection result of steps A 4.
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| CN102215492B (en) * | 2011-06-10 | 2013-09-25 | 西安电子科技大学 | User-feedback-based multi-cell resource allocation method |
| CN102387528B (en) * | 2011-11-08 | 2017-11-07 | 中兴通讯股份有限公司 | A kind of interferometry information notice method, interference detecting method, base station and terminal |
| CN105991270B (en) * | 2015-02-11 | 2019-09-17 | 电信科学技术研究院 | A kind of method and apparatus reducing interference |
| CN107197464A (en) * | 2017-07-31 | 2017-09-22 | 广东工业大学 | Eliminate frequency resource allocation method and system that neighbor cell is disturbed edge customer |
| CN111148253B (en) * | 2019-12-31 | 2023-03-14 | 网络通信与安全紫金山实验室 | Satellite communication downlink SC-OFDMA frequency allocation method accessed by various terminals |
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| GB2415871A (en) * | 2004-06-30 | 2006-01-04 | Samsung Electronics Co Ltd | Dynamic subcarrier allocation in Multicarrier Spread Spectrum communication |
| CN1909537A (en) * | 2005-08-02 | 2007-02-07 | 松下电器产业株式会社 | Method for increasing capacity of multiple districts crossing frequency division multiple address-time division multiple address system |
| CN101193086A (en) * | 2006-11-30 | 2008-06-04 | 中国移动通信集团设计院有限公司 | A frequency planning method for OFDM system |
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| CN1968239A (en) * | 2005-11-17 | 2007-05-23 | 松下电器产业株式会社 | Carrier allocation method for multi-cell orthogonal frequency division multiple address system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2415871A (en) * | 2004-06-30 | 2006-01-04 | Samsung Electronics Co Ltd | Dynamic subcarrier allocation in Multicarrier Spread Spectrum communication |
| CN1909537A (en) * | 2005-08-02 | 2007-02-07 | 松下电器产业株式会社 | Method for increasing capacity of multiple districts crossing frequency division multiple address-time division multiple address system |
| CN101193086A (en) * | 2006-11-30 | 2008-06-04 | 中国移动通信集团设计院有限公司 | A frequency planning method for OFDM system |
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