CN101325445A - Dynamic networking method for OFDMA access system - Google Patents
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Abstract
The invention discloses a dynamic networking method of a orthogonal frequency division multiple access system, for performing the optimizing configuration on the system resource and advancing the frequency spectrum efficiency of the network, comprising: dividing the district into a plurality of areas by a network controller or a station, distributing the routine sub-carrier for each area in the time of frequency program and reserving the sub-carrier, and performing the dynamic distribution on the reserved sub-carrier between each area according to the change of the operation requirement in the system operating process; determining the ratio of the compensating power and the water injecting power in the time of power planning by the network controller or the station, and distributing the compensating power and the water injecting power for each area, and in the system operating process, the dynamic adjustment is processed according to the disturbing condition of the adjacent area or the change of the operation distribution of the district on the transmitting power of each district.
Description
Technical field
The present invention relates to the networking technology of digital communicating field, relate in particular to OFDM and insert (Orthogonal Frequency Division Multiple Access, the OFDMA) networking technology of cellular system.
Background technology
Disturbing (Inter-cell interference is called for short ICI) between sub-district (sector) is an intrinsic problem of cell mobile communication systems, and traditional solution is to adopt channeling.Generally speaking, the multiplexing factor adopts specific several selections, as 1,1/3,1/7 etc.The multiplexing factor equals 1 and represents that promptly neighbor cell all uses identical frequency resource, and the interference that is subjected to of cell edge at this moment is very serious.The lower multiplexing factor (as 1/3 or 1/7) can suppress presence of intercell interference effectively, but will cause the lower availability of frequency spectrum, can not satisfy the demand of growing wireless traffic.
Owing to have good anti-frequency selective characteristic and higher spectrum utilization efficiency, OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology has become one of mainstream technology that solves WiMAX access of future generation, and be adopted as the physical layer key technology by each big standards such as 3GPP LTE (3rd GenerationPartnership Project, Long Term Evolution), IEEE 802.16.Orthogonal frequency division multiplexing multiple access access technology OFDMA based on OFDM can realize the orthogonality between each user in the sub-district, thereby has avoided the inter-user interference in the sub-district effectively.But, being similar to second generation wireless communication system GSM (Global System For MobileCommunication), ICI will be one of principal element of system for restricting performance.Therefore, suppressing ICI effectively is the key means that improves systematic function.
At present, the technology that being used to of studying suppressed ofdm system ICI mainly comprises: interference randomization, interference eliminated and interference coordination.Wherein, the enforcement of interference randomization and interference cancellation techniques need be disposed the relevant hardware resource, has increased the processing complexity of transceiver, has improved the cost of the user and the network facilities; And interference coordination technique only needs to carry out reasonable parameter configuration in network terminal, just can improve the resource utilization and the quality of services for users QoS (Quality of Service) of system greatly.Therefore, in hardware resource limited networking and operation stage, interference coordination technique will become disturbs the main path that suppresses.
Research at OFDMA cellular system networking plan, because simple channeling is difficult to reach the purpose of taking into account system spectral efficiency and cell edge covering performance, so need effectively in conjunction with other RRM means, use frequency spectrum resource flexibly, efficiently, and satisfy user's QoS demand.In wireless network, power programming (distribution) algorithm plays crucial effects to guaranteeing link-quality, reduction co-channel interference efficiently, so in beehive net design for scheme process,, also need emphasis to consider the planning of power resource except the coordination utilization of frequency resource.In the standard evolution process of cellular system, at networking plan the thinking that channeling and power programming (distribution) combine has been proposed, but how combination, still do not provide the clear and definite scheme of a cover, but elementary object is exactly by high performance power programming (distribution) scheme, reach comparatively compact frequency reuse mode, realize the efficient utilization of frequency resource.
On the other hand, along with the continuous development of wireless traffic, the requirement of user data rate will present bigger imbalance and dynamic characteristic.In the layoutprocedure of system resource, the interference that exists in the reduction system as far as possible improves the frequency spectrum service efficiency, on the other hand on the one hand, to adjust optimization system performance and user's QoS according to the dynamic characteristic of user and system adaptively accordingly to system parameters.
Summary of the invention
The technical problem to be solved in the present invention is the dynamic networking method that a kind of OFDM inserts (OFDMA) system, and system resource is optimized configuration, improves the spectrum efficiency of network.
In order to address the above problem, the present invention proposes a kind of dynamic networking method of orthogonal frequency division multiple access system, comprise following content:
Network controller or base station are divided into a plurality of zones to microzonation, be the conventional sub carrier group of each region allocation and preserved sub-carrier in frequency planning, and in system's running according to the variation of business demand with preserved sub-carrier dynamic assignment between each zone;
The ratio of compensation power and water injection power is determined in network controller or base station in power programming, and be each region allocation compensation power and water injection power, and in system's running, each regional transmitting power is dynamically adjusted according to the variation of the service distribution of the disturbance regime of neighbor cell or sub-district.
Further, described network controller or base station are according to link-quality microzonation to be divided into a plurality of zones, comprise inside, sub-district and cell edge at least, and the link-quality of inside, described sub-district is better than the link-quality of described cell edge.
Further, described network controller or base station are divided into a plurality of sub carrier group with conventional subcarrier, will coordinate in the minizone in the time of for each region allocation sub carrier group, guarantee that the neighbor cell edge uses different sub carrier group.
Further, by a kind of distribution of carrying out conventional sub carrier group in following 2 kinds of modes, use different sub carrier group in described network controller or the base station to guarantee the neighbor cell edge:
A uses identical frequency duplex factor as one on the conventional subcarrier of sub-district, and makes the fringe region of neighbor cell use different conventional subcarrier frequency ranges;
B, the frequency duplex factor as one that on the frequency duplex factor as one that uses on the conventional subcarrier of inside, sub-district is higher than conventional subcarrier at cell edge, uses, and make the fringe region of neighbor cell not use identical conventional subcarrier frequency range.
Further, described network controller or base station are according to each regional link-quality, target signal to noise ratio and business demand described cell area to be carried out path loss power back-off, make each regional user reach basic transmission quality.
Further, described network controller or base station are the part power of getting in the total transmitting power in base station by way of compensation, and dump power as water injection power, is carried out the power water filling to described cell area.
Further, described compensation power accounts for the following several modes of configuration employing of the ratio of the total transmitting power in described base station: static configuration, semi-static configuration or dynamic-configuration.
The dynamic networking method that adopts the present invention to propose, can be dynamically in conjunction with layering channeling, average loss compensation and water injection power planning, and the disturbance regime in the energy real time monitoring network and the demand of different regions traffic carrying capacity, considering on the basis of all users to quality of service requirement comprehensively, system resource is optimized configuration, improves the spectrum efficiency of network.
Description of drawings
Fig. 1 is the flow chart of networking plan among the present invention;
Fig. 2 is conventional subcarrier and a preserved sub-carrier division schematic diagram among the present invention;
Fig. 3 is that cell area is divided schematic diagram among the present invention;
Fig. 4 is that conventional subcarrier is divided schematic diagram among the present invention;
Fig. 5 is that schematic diagram is coordinated and disturbed to medium frequency of the present invention;
Fig. 6 is a power division schematic diagram among the present invention.
Embodiment
In order to utilize limited frequency resource better, improve the covering performance at power system capacity and edge, sub-district (sector), need to use relatively compact frequency reuse mode on the one hand as far as possible, improve the service efficiency of frequency resource, high more but then frequency duplex factor as one will mean how potential more co-channel interference.High co-channel interference will cause influence to a certain degree to user's link performance, especially the edge customer when neighbor cell (sector) uses identical frequency resource, and interference power and signal power are quite even when being higher than signal power, received signal quality seriously descends, so that in the selection course of modulation coding mode MCS (Modulation and Coding Scheme), lower carrier interference ratio C/I R (Carrier to Interference Ratio) even be difficult to satisfy the requirement of the lowest class modulation coding mode, cause packet that frequent re-transmission takes place, thereby reduced the spectrum efficiency of system edges.So under comparatively compact frequency reuse mode, need effectively control the interference in the system in conjunction with other RRM means.
In addition, angle from the user, under fair relatively frequency domain or time domain scheduling mechanism, on long terms, it is balanced that the transfer of data chance that the user obtains should be tending towards, so, reach same or analogous data rate requirement, Cell Edge User need distribute higher transmitting power, and Cell Center User then needs less transmitting power can satisfy the corresponding link quality requirement, thereby can reduce the interference to neighbor cell (sector) border district.Certainly, reasonably increase the inner power in sub-district (sector), can improve the average size of whole sub-district (sector).Therefore, when carrying out sub-district (sector) frequency planning, take power programming into consideration, can suppress the interference between sub-district (sector), improve sub-district (sector) edge performance, can keep whole higher system performance again.
Angle from business, the user presents bigger imbalance and dynamic characteristic to the requirement of data speed, in the process of resource distribution, need the requirement of data speed dynamically to be adjusted Internet resources (frequency, power) according to the zones of different user, and in the process of adjusting, need the utilization of resources of minizone is coordinated, reduce co-channel interference.
At above-mentioned viewpoint, the frequency resource of system is planned in each sub-district (sector), promptly the frequency resource that can use the user of the interior zones of different in sub-district (sector) is carried out certain restriction, and the Frequency Distribution between sub-district (sector) is coordinated flexibly, at least the edge customer that guarantees neighbor cell (sector) can not use identical frequency resource, both reduced co-channel interference effectively by rational power allocation scheme, can guarantee again the entire system spectrum efficiency is not caused too many loss, simultaneously in the operation process of network, disturbance regime in the system and service distribution are carried out real-time monitoring, and the resource distribution of system is upgraded according to network condition, system resource is carried out fully reasonable use to reach.
In order to adapt in the network professional imbalance and dynamic change, consider the interference coordination between the sub-district (sector) simultaneously, the certain sub-carrier resources of reservation in each sub-district (sector) is used for the variation of traffic carrying capacity between adaptation zone.The design of preserved sub-carrier and utilization need the co-channel interference between emphasis consideration neighbor cell (sector).
The present invention proposes the dynamic group net scheme that a kind of channeling combines with power division.At first, each sub-district (sector) is divided into N zone, then each sub-district (sector) carried out the planning of frequency and power resource, mainly comprise following four parts according to user chain quality:
Frequency planning: sub-district (sector) frequency planning employing frequency duplex factor as one is 1 soft-frequency reuse, soft-frequency reuse herein is meant that multiplexing coefficient is 1 between sub-district (sector), multiplexing coefficient between the interior zones of different in sub-district (sector) is smaller or equal to a kind of frequency multiplexing mode of 1, the multiplex mode shown in following mode one and mode two.The subcarrier of described wherein each sub-district (sector) is divided into two parts: conventional subcarrier and preserved sub-carrier.Wherein conventional subcarrier is used for conventional business demand in the sub-district (sector), adopt static or semi-static configuration, (because the update cycle of conventional sub-carrier distribution manner is longer, static herein or semi-static configuration is to reserve the short dynamic-configuration of update cycle that son carries relatively), preserved sub-carrier is used for sub-district (or sector) interior particular service amount demand, carry out reasonable disposition according to dynamic change professional in the system, adopt dynamic-configuration.In same sub-district (sector), conventional subcarrier is divided into groups, distribute to different zones and use.The method of salary distribution has following dual mode:
Mode one, can on the conventional subcarrier in same sub-district (sector), use identical frequency duplex factor as one, and the method for salary distribution to conventional subcarrier between sub-district (sector) is coordinated, and makes the fringe region of neighbor cell not use identical conventional subcarrier frequency range.
Mode two, on sub-district (sector) inner conventional subcarrier, use higher frequency duplex factor as one (equaling 1) as frequency duplex factor as one, and the lower frequency duplex factor as one (equaling 1/3 as frequency duplex factor as one) of use on the conventional subcarrier at edge, sub-district (sector), and the method for salary distribution to conventional subcarrier between sub-district (sector) is coordinated (especially the conventional subcarrier at edge, sub-district (sector) is coordinated), makes the fringe region of neighbor cell not use identical conventional subcarrier frequency range.
Frequency planning is not limited to above dual mode, and any can guarantee reduction between sub-district (sector) disturbs, and the frequency duplex factor as one between sub-district (sector) is that 1 soft-frequency reuse pattern can be used simultaneously.
Inside, sub-district and cell edge are the logic regions of dividing according to link-quality herein, are not meant the geographic area.
Power programming (distribution): according to factors such as each regional link-quality, target signal to noise ratio and business demands with total transmit power allocations of base station to different cell area.Power programming (distribution) mainly comprises two parts, first is the distribution of path loss compensation power, purpose is in order to allow the user of the interior zones of different in sub-district (sector) can reach basic transmission quality, second portion is the distribution of each regional water injection power, purpose be for allow in each zone link-quality relatively preferably the user get more power, thereby improve the overall performance of system.In this two parts power programming (distribution), first is necessary, second portion is optional, and the ratio that the power of first and second portion accounts for gross power can be static, semi-static or dynamic, static state herein, semi-static or dynamic definition is the speed speed that resource coordination is upgraded according to system.
Power is adjusted: in system's running, system is according to the disturbance regime of neighbor cell and the requirement that will reach thereof, power division to the neighbor cell fringe region is dynamically adjusted, the adjustment mode can be for distributed or centralized, and can dynamically adjust each regional power division of sub-district according to the factors such as service distribution of this sub-district.
The distribution of preserved sub-carrier: in system's running, the subcarrier allocation that system reserves each sub-district (sector) is given the zone in each sub-district (sector).This distribution can be static, and is semi-static or dynamic.The principle of distributing can be the demand according to business, also can be according to situation about disturbing.For example more subcarrier can be distributed for it in the zone that traffic carrying capacity is big from preserved sub-carrier.
Above-mentioned Frequency Distribution adjustment and power division adjustment are carried out by network controller or base station.
Illustrate with a specific embodiment how the present invention realizes the interior frequency planning in sub-district (sector), power programming (distribution), the distribution of power adjustment and preserved sub-carrier below.
The bandwidth of supposing the OFDMA system is 10MHz, and subcarrier spacing is 15KHz, removes protection frequency band and DC component, and the available subcarrier number is 600.In the system design of reality, consider the complexity and the signaling consumption of resource allocation, with the plurality of sub carrier wave form a Resource Block (Resource block, RB), the base unit that distributes as first resource.In the present invention, becoming a RB with 25 sub carrier group is example, and then available RB number is 24 in the system.
Specific implementation step following (divide into three sectors for a short time for one in the present embodiment, so this embodiment is based on that the sector illustrates, but succinct, hereinafter is defined as the sub-district) in order to describe:
The planning of step 101 cell frequency.
The cell frequency multiplex factor is 1, and all frequency resources are all used in each sub-district, i.e. 24 RB.In each sub-district, with the available subcarrier separated into two parts: conventional subcarrier and preserved sub-carrier, 9 RB are preserved sub-carrier in the present embodiment, and 15 RB are that conventional subcarrier is an example, and the division of two parts subcarrier is as shown in Figure 2.
If it is N that cell area is divided the factor, is about to the sub-district and is divided into N zone.Get N=3 in the present invention, the sub-district is divided into 3 zones: zone 1, zone 2, zone 3, as shown in Figure 3.Area dividing among Fig. 3 only is a schematic diagram, because the division of cell area carries out according to user chain quality, thus may still be in the zone 2 the user of cell edge in the geographical position, or even in the zone 1; In like manner, the geographical position also may be divided in the zone 3 because link-quality is poor near the user of base station.
Conventional subcarrier planning of step 103 and coordination.
According to the above-mentioned zone division methods, conventional subcarrier can be divided into 3 groups, each zone is used one group as shown in Figure 4.For the fringe region that guarantees neighbor cell does not use identical conventional subcarrier frequency range, as shown in Figure 5 the conventional sub carrier group in each zone in the different districts is coordinated, the dashed double of overstriking is represented to disturb among Fig. 5, the dotted line of overstriking is represented the boundary line, sector, inner rectangle for blank filling is represented conventional sub carrier group 1, inner rectangle for the point-like filling is represented conventional sub carrier group 2, and inner rectangle for the straight line filling is represented conventional sub carrier group 3.The planning of the conventional subcarrier in the sub-district can also be used additive method certainly, use higher frequency duplex factor as one (equaling 1) as inside as frequency duplex factor as one in the sub-district, and the edge of sub-district uses lower frequency duplex factor as one (equaling 1/3 as frequency duplex factor as one), and the conventional sub carrier group to cell edge is coordinated, and makes the fringe region of neighbor cell not use identical conventional subcarrier frequency range.The planning of the conventional subcarrier in the sub-district is not limited to above dual mode, anyly can guarantee reduce presence of intercell interference, and the conventional subcarrier multiplex factor of minizone is that 1 soft-frequency reuse pattern can be used simultaneously.
Each user chain quality to the sub-district is measured, for the operation of following dynamic adjustment provides relevant parameter.
Fading compensation and the interregional power water filling of step 106 in step 105 zone.
Use the P% of total transmitting power of base station in the step 105, wherein the value of P% draws according to the network demand in the real system, is used to compensate the large scale and the shadow fading in 3 zones; Be used for the power water filling with remaining 1-P% power in the step 106, as shown in Figure 6, among Fig. 6, the inner compensation power of representing conventional sub carrier group 1 region for blank rectangle of filling, inner rectangle for the point-like filling is represented the compensation power of conventional sub carrier group 2 regions, inner rectangle for the vertical line filling is represented the compensation power of conventional sub carrier group 3 regions, and inner rectangle for the filling of left-hand oblique line is represented the water injection power of corresponding conventional sub carrier group region.When the value of P% equals 100%, illustrate and only carry out step 105 power division promptly have only power back-off, there is not the power water filling.Simultaneously the value of P% can be static, and is semi-static or dynamic.
By the power programming (distribution) of step 105 and step 106, each regional current scheduled user's down-link transmitting power is power sum in two steps.
The adjustment of step 107 power.
In system's running, link circuit condition on each frequency range is measured, its Mid Frequency can comprise one or more subcarriers, obtain the disturbance state of neighbor cell according to measurement result, as do not reach requirement, transmitting power to the fringe region of neighbor cell is made dynamic adjustment, disturbs to reduce as increasing transmitting power.The adjustment of power can also be according to the demand of business.
The distribution of step 108 preserved sub-carrier.
In system's running,, the subcarrier allocation of 9 RB of each sub-district (sector) reservation is given the zone of each sub-district (sector) demand according to business.This distribution can be static, and is semi-static or dynamic.The principle of distributing also can be according to situation about disturbing.
After the step 108, flow process can forward step 105 place to, and circulation execution in step 105, step 106, step 107, step 108 are constantly dynamically adjusted power resource and frequency resource.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (7)
1, a kind of dynamic networking method of orthogonal frequency division multiple access system is characterized in that,
Network controller or base station are divided into a plurality of zones to microzonation, be the conventional sub carrier group of each region allocation and preserved sub-carrier in frequency planning, and in system's running according to the variation of business demand with preserved sub-carrier dynamic assignment between each zone;
The ratio of compensation power and water injection power is determined in network controller or base station in power programming, and be each region allocation compensation power and water injection power, and in system's running, each regional transmitting power is dynamically adjusted according to the variation of the service distribution of the disturbance regime of neighbor cell or sub-district.
2, the method for claim 1, it is characterized in that, described network controller or base station are according to link-quality microzonation to be divided into a plurality of zones, comprise inside, sub-district and cell edge at least, and the link-quality of inside, described sub-district is better than the link-quality of described cell edge.
3, the method for claim 1, it is characterized in that, described network controller or base station are divided into a plurality of sub carrier group with conventional subcarrier, will coordinate in the minizone in the time of for each region allocation sub carrier group, guarantee that the neighbor cell edge uses different sub carrier group.
4, method as claimed in claim 3 is characterized in that, by a kind of distribution of carrying out conventional sub carrier group in following 2 kinds of modes, uses different sub carrier group to guarantee the neighbor cell edge in described network controller or the base station:
A uses identical frequency duplex factor as one on the conventional subcarrier of sub-district, and makes the fringe region of neighbor cell use different conventional subcarrier frequency ranges;
B, the frequency duplex factor as one that on the frequency duplex factor as one that uses on the conventional subcarrier of inside, sub-district is higher than conventional subcarrier at cell edge, uses, and make the fringe region of neighbor cell not use identical conventional subcarrier frequency range.
5, the method for claim 1, it is characterized in that, described network controller or base station are according to each regional link-quality, target signal to noise ratio and business demand described cell area to be carried out path loss power back-off, make each regional user reach basic transmission quality.
6, the method for claim 1 is characterized in that, described network controller or base station are the part power of getting in the total transmitting power in base station by way of compensation, and dump power as water injection power, is carried out the power water filling to described cell area.
7, the method for claim 1 is characterized in that, described compensation power accounts for the configuration of the ratio of the total transmitting power in described base station and adopts following several modes: static configuration, semi-static configuration or dynamic-configuration.
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| WO2011023073A1 (en) * | 2009-08-25 | 2011-03-03 | 华为技术有限公司 | Method, equipment and system for sharing frequency spectrum resource |
| CN102164402A (en) * | 2011-05-03 | 2011-08-24 | 大唐移动通信设备有限公司 | Method and device for configuring carrier transmitting power |
| CN102316584A (en) * | 2010-06-30 | 2012-01-11 | 中兴通讯股份有限公司 | Uplink frequency spectrum resource allocation method and base station |
| CN102547721A (en) * | 2009-08-25 | 2012-07-04 | 华为技术有限公司 | Method, device and system for sharing spectrum resources |
| WO2013063947A1 (en) * | 2011-10-31 | 2013-05-10 | 中兴通讯股份有限公司 | Dynamic frequency planning method and device for cells |
| WO2014048124A1 (en) * | 2012-09-29 | 2014-04-03 | 华为技术有限公司 | Frequency spectrum division method, device and system |
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| US5946625A (en) * | 1996-10-10 | 1999-08-31 | Ericsson, Inc. | Method for improving co-channel interference in a cellular system |
| CN1305340C (en) * | 2003-12-05 | 2007-03-14 | 清华大学 | Method and structure for enhancing downstream frequency multiplexing efficiency of cellular cell |
| CN100531174C (en) * | 2005-04-29 | 2009-08-19 | 华为技术有限公司 | Resource distribution between multi-carrier systems with frequency duplex factor as one |
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| CN102547721A (en) * | 2009-08-25 | 2012-07-04 | 华为技术有限公司 | Method, device and system for sharing spectrum resources |
| CN102547721B (en) * | 2009-08-25 | 2015-09-30 | 华为技术有限公司 | The method of share spectrum resources, equipment and system |
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| CN102164402A (en) * | 2011-05-03 | 2011-08-24 | 大唐移动通信设备有限公司 | Method and device for configuring carrier transmitting power |
| CN102164402B (en) * | 2011-05-03 | 2013-10-16 | 大唐移动通信设备有限公司 | Method and device for configuring carrier transmitting power |
| WO2013063947A1 (en) * | 2011-10-31 | 2013-05-10 | 中兴通讯股份有限公司 | Dynamic frequency planning method and device for cells |
| CN103716799A (en) * | 2012-09-29 | 2014-04-09 | 华为技术有限公司 | Frequency-spectrum division method, devices and system |
| WO2014048124A1 (en) * | 2012-09-29 | 2014-04-03 | 华为技术有限公司 | Frequency spectrum division method, device and system |
| US9226162B2 (en) | 2012-09-29 | 2015-12-29 | Huawei Technologies Co., Ltd. | Spectrum division method, device, and system |
| CN103716799B (en) * | 2012-09-29 | 2017-12-05 | 华为技术有限公司 | Method, equipment and the system of frequency spectrum division |
| CN106851747A (en) * | 2015-12-03 | 2017-06-13 | 中兴通讯股份有限公司 | Dynamic resource allocation method and device in a kind of GSM |
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