CN103944849A - Dynamic soft-frequency reuse algorithm for cell interference coordination - Google Patents
Dynamic soft-frequency reuse algorithm for cell interference coordination Download PDFInfo
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Abstract
The invention aims at providing a dynamic soft-frequency reuse algorithm for cell interference coordination. The algorithm is capable of adapting to inter-cell load change and includes two parts: dynamic adjustment of a carrier (called main carrier) number of edge users and dynamic main carrier configuration. In a first part, that is, a dynamic main carrier number adjustment algorithm, each sector calculates the load value through using 1000 transmission time intervals as a period and notifies the value to an adjacent sector and each sector adjusts the main carrier number N according to a proportion of a load of the sector in a total load. In a second part, that is a dynamic main carrier configuration algorithm, according to a proportional fairness scheduling algorithm, a proportional fairness factor of each user in all of the carriers is determined and then first N subcarriers which are highest in factor are selected and distributed to the edge users to which the subcarriers belong. If a plurality of user factors are identical, the subcarriers are randomly distributed to one of the edge users to which the subcarriers belong. The algorithm improves system throughput by about 12%, edge user throughput by 4.5% and center user throughput by 13% compared with traditional soft frequency reuse.
Description
Technical field:
The present invention relates to the soft-frequency reuse method of interference coordination in LTE community.
Background technology
LTE system descending adopts OFDM technology, and owing to having good orthogonality between OFDM subcarrier, therefore in community, the interference between user can be effectively suppressed.In order to support higher transmission rate and power system capacity, objectively the channeling efficiency of many minizones to be had higher requirement, full rate multiplexing (being that frequency reuse is 1) is the strong scheme that meets the demand.But, adopting under the network coverage strategy of identical networking, it is very serious that the co-channel interference of different districts will become.Therefore, how to avoid or reduce presence of intercell interference and become the major issue that improves LTE power system capacity and QoS of customer.
For fear of or reduce LTE system inter-cell interference, researcher has proposed many area interference inhibition technology both at home and abroad, interference coordination technique is one wherein.The core concept of interference coordination technique is by the coordination of the available resources such as time-frequency and power being used in minizone, the resource that as far as possible reduces neighbor cell is used conflict, thereby avoid or reduce the co-channel interference between neighbor cell, improve user's Signal Interference and Noise Ratio, increase the data rate of Cell Edge User and improve the coverage of community.The realization of interference coordination technique is relatively simple, use flexibly and also effect also more satisfactory, thereby become very soon the mainstream technology that presence of intercell interference suppresses.
The soft-frequency reuse that the company such as Ericsson and Huawei proposes is a kind of implementation of interference coordination technique, and this scheme is by being optimized to realize in network planning, the coordination of frequency spectrum resource to be used.Particularly, system frequency range is divided into main carrier and subcarrier by this scheme, main carrier distributes higher transmitting power (being called total power) priority allocation to use to edge customer, subcarrier distributes less transmitting power (being called Partial Power), only distributes to center of housing estate region user and uses.The main carrier of neighbor cell is not overlapping, with this interference that Cell Edge User is subject to always, reaches the object that improves community marginal user performance.
Can find out, soft-frequency reuse scheme is by static division frequency resource, taking the performance of sacrificing Cell Center User as cost, promotes community marginal user performance.Static frequency planning causes the availability of frequency spectrum lower, and the flexibility of the distribution of resource and adaptability deficiency, is difficult to adapt to the polytropy of load capacity under wireless environment.
Summary of the invention
goal of the invention
The present invention is intended to provide a kind of dynamic soft-frequency reuse algorithm that can adapt to minizone load variations, effectively improve community marginal user performance and throughput of system.
The dynamic soft-frequency reuse algorithm providing is by dynamic community adjusting edge customer carrier wave (being called main carrier) number and dynamically main carrier configuration two parts realization.The dynamic main carrier number of Part I adjustment algorithm is that each sector is with 1000 Transmission Time Intervals (Transmission Time Interval, TTI) be computation of Period load value, and by this value notice adjacent sectors, the ratio that each sector accounts for total load according to this sector load is adjusted the number of main carrier; The dynamic main carrier placement algorithm of Part II refers to that sector passing ratio fair scheduling algorithm determines the equitable proportion coefficient of each user on all carrier waves, choose again the subcarrier that top n coefficient is the highest (N is the definite main carrier number of Part I), the edge customer under it is distributed to.Have multiple users' coefficient identical if having on main carrier, one of them affiliated edge customer is given in Random assignment.
technical scheme
1. dynamic soft-frequency reuse algorithm, is characterized in that, comprises dynamic main carrier number adjustment algorithm and the dynamic dynamic main carrier number of main carrier placement algorithm adjustment algorithm, comprises the steps 10 and 20:
---step 10: each sector is taking 1000 Transmission Time Intervals (Transmission Time lnterval, TTI) as this sector load value of computation of Period, and by this value notice adjacent sectors,
---step 20: this sector main carrier number is calculated according to the adjacent sectors load value receiving in each sector.
Dynamically main carrier placement algorithm, comprises the steps:
---step 10: in each dispatching cycle, Proportional Fair (Proportional Fair, the PF) coefficient matrix of all edge customers in this sector on all carrier waves calculated in each sector,
---step 20: the maximum of calculating all edge customer PF coefficients on each carrier wave forms vector
, and record the corresponding user of each maximum.
---step 30: from
in select again maximum front S
iindividual value, is defined as this sector main carrier by its corresponding carrier wave, main carrier is distributed to the user of each correspondence of record simultaneously.
2. in the dynamic main carrier number adjustment algorithm of claim 1, the main carrier number computing formula of step 20 is
wherein S is system carrier number summation, ρ
ifor the load value of sector i.
3. in the dynamic main carrier placement algorithm of claim 1, the equitable proportion coefficient of step 10 refers to
wherein R
i, k(t) be illustrated in the transmission rate that the t moment supposes that user i can realize while transmission on k subcarrier, T
i(t) be illustrated in length of window t preset time
csituation under the average throughput of user i, its computing formula is
wherein, S
i(t-1) being illustrated in previous moment t-1 is scheduled to the subcarrier set of user i.
beneficial effect
Dynamically soft-frequency reuse algorithm divides dynamic adjustment Cell Edge User carrier wave (being called main carrier) number and dynamic main carrier configuration two parts.Dynamically adjust main carrier number by calculating the ratio of the load capacity of these 1000 Transmission Time Intervals in sector and the load capacity of other adjacent sectors, draw the main carrier number of this community.Therefore, dynamically adjust the situation that main carrier number can effectively adapt to minizone load imbalance, can make frequency resource be fully used; Dynamically main carrier configuration passing ratio equity dispatching device is selected the carrier wave that top n (N is the definite main carrier number of the first step) has the fair coefficient of maximum ratio from whole subcarriers, they is decided to be to main carrier and distributes to affiliated edge customer.This method is independently carried out by each sector, does not need any communication of minizone, increases without signaling traffic load; And this algorithm, than traditional soft-frequency reuse, has just increased this operation of simple sequence of the fair coefficient of comparative example, therefore this algorithm is less on system complexity impact.
In general, dynamically soft-frequency reuse approximately has 12% throughput of system lifting, 4.5% edge customer throughput hoisting, and 13% central user throughput hoisting with respect to conventional softer channeling.
Brief description of the drawings
Fig. 1 is cell throughout comparison diagram under 7 cell pattern.
Fig. 2 is sector-edge user throughput comparison diagram under 7 community 21 sector models.
Fig. 3 is 7 community 21 sector model lower fan district center user throughput comparison diagrams.
Embodiment
Dynamically soft-frequency reuse implements to be mainly divided into two parts: the one, dynamically adjust main carrier number, and the 2nd, dynamic main carrier configuration.
Dynamically adjust main carrier number algorithm and refer to that each sector, taking 1000 Transmission Time Intervals as the cycle, adds up the load capacity of this sector, and notify adjacent sectors; Obtain after the load capacity of adjacent sectors, with
this formula is calculated the main carrier number of sector, and wherein, wherein S is system carrier number summation, ρ
ifor the load value of sector i, S
iit is exactly the main carrier number of this sector.
Dynamically main carrier placement algorithm obtained the main carrier number S that this sector can be distributed in this dispatching cycle before this
i, this number has dynamic adjustment main carrier number algorithm to obtain; Then, the CQI value of feeding back by edge customer, the equitable proportion coefficient of the whole subcarriers of proportional fair scheduler edge calculation user; Then on each subcarrier, select the subcarrier composition of vector that has equitable proportion coefficient maximum
; Finally, from
in select front S
ithe subcarrier of individual equitable proportion coefficient maximum is as main carrier, and gives corresponding user by these allocation of carriers, if multiple user has identical equitable proportion coefficient on a main carrier, gives in these users by this main carrier Random assignment.
Claims (3)
1. dynamic soft-frequency reuse algorithm, is characterized in that, comprises dynamic main carrier number adjustment algorithm and dynamic main carrier placement algorithm
Dynamically main carrier number adjustment algorithm, comprises the steps 10 and 20:
---step 10: each sector is taking 1000 Transmission Time Intervals (Transmission Time lnterval, TTI) as this sector load value of computation of Period, and by this value notice adjacent sectors,
---step 20: this sector main carrier number is calculated according to the adjacent sectors load value receiving in each sector.
Dynamically main carrier placement algorithm, comprises the steps:
---step 10: in each dispatching cycle, Proportional Fair (Proportional Fair, the PF) coefficient matrix of all edge customers in this sector on all carrier waves calculated in each sector,
---step 20: the maximum of calculating all edge customer PF coefficients on each carrier wave forms vector
, and record the corresponding user of each maximum.
---step 30: from
in select again maximum front S
iindividual value, is defined as this sector main carrier by its corresponding carrier wave, main carrier is distributed to the user of each correspondence of record simultaneously.
2. in the dynamic main carrier number adjustment algorithm of claim 1, the main carrier number computing formula of step 20 is
wherein S is system carrier number summation, ρ
ifor the load value of sector i.
3. in the dynamic main carrier placement algorithm of claim 1, the equitable proportion coefficient of step 10 refers to
wherein R
i, k(t) be illustrated in the transmission rate that the t moment supposes that user i can realize while transmission on k subcarrier, T
i(t) be illustrated in length of window t preset time
csituation under the average throughput of user i, its computing formula is
wherein, S
i(t-1) being illustrated in previous moment t-1 is scheduled to the subcarrier set of user i.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106408930A (en) * | 2015-07-31 | 2017-02-15 | 中国联合网络通信集团有限公司 | Method and apparatus for creating driving fleet |
| CN113079105A (en) * | 2021-03-30 | 2021-07-06 | 联芸科技（杭州）有限公司 | Data transmission method, system, computer device and medium |
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| CN101227695A (en) * | 2007-01-16 | 2008-07-23 | 华为技术有限公司 | Apparatus and method for distributing district communication resource |
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Patent Citations (4)
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| CN1783861A (en) * | 2004-12-01 | 2006-06-07 | 华为技术有限公司 | Method for realizing frequency soft multiplexing in radio communication system |
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| CN101227695A (en) * | 2007-01-16 | 2008-07-23 | 华为技术有限公司 | Apparatus and method for distributing district communication resource |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106408930A (en) * | 2015-07-31 | 2017-02-15 | 中国联合网络通信集团有限公司 | Method and apparatus for creating driving fleet |
| CN113079105A (en) * | 2021-03-30 | 2021-07-06 | 联芸科技（杭州）有限公司 | Data transmission method, system, computer device and medium |
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