CN1719816A - Resource allocation methods in the ofdm system - Google Patents
Resource allocation methods in the ofdm system Download PDFInfo
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- CN1719816A CN1719816A CN 200410060177 CN200410060177A CN1719816A CN 1719816 A CN1719816 A CN 1719816A CN 200410060177 CN200410060177 CN 200410060177 CN 200410060177 A CN200410060177 A CN 200410060177A CN 1719816 A CN1719816 A CN 1719816A
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Abstract
A kind of resource allocation methods in ofdm system, frame structure are divided into fixedly ascender, fixedly descender and up/descending adjustable part; Certain a part of resource is carried out segmentation on the frequency domain of up/descending adjustable part; The up-downgoing business proportion is distributed by the scheduling of resource to this part resource in each sub-district.The present invention has avoided interference by having carried out the division of subchannel in the part that might produce the up-downgoing interference.Each sub-district is free to determine belong to the traffic direction of its UL-DL-PART, can adjust the up-downgoing business proportion to a certain extent rapidly, thereby bring certain professional flexibility ratio.The resource that belongs to UL-DL-PART can be used in peritropous sub-district in a sub-district, thus the accommodation of further broaden business.In inside, sub-district, the traffic direction (UL or DL) of one's own UL-DL-PART part is adjusted, and the base station in the sub-district can be arranged fully voluntarily, needn't notify the upper level resource control part when each the adjustment.
Description
Technical field
The present invention relates to the field of information transmission in OFDM (hereinafter to be referred as the OFDM) system, particularly be used for the method for information processings such as time synchronized, carrier shift in the ofdm system.
Background technology
OFDM is a kind of sound communication technology of carrying out the effective information transmission in channel.This technology utilizes a plurality of subcarriers (sub-carrier frequency) parallel, the transmission low-rate data to realize the communication of high data rate.Its technical essential is that the Channel Transmission bandwidth is divided into the plurality of sub frequency band, uses the subcarrier transmitting data information of mutually orthogonal on each sub-band concurrently, utilizes the orthogonality of its each subcarrier at receiving terminal, isolates the data message of parallel transmission.
The OFDM technology successfully has been applied in many communication systems, for example, digital broadcasting (DAB) and Digital Television (DVB) the employing OFDM technology formulated by european telecommunications standards institute ETSI are the wireless transmission standards of air interface, and WLAN standard IEEE802.11 and wireless metropolitan area network standard IEEE802.16 have also adopted the OFDM technology in addition.
Along with the continual renovation of communication service, various new business demands constantly occur, and so just require system that enough flexibility ratios will be arranged, and the dynamic change of possible business stays enough leeway for future.
Can come flexible dispatching system resource according to business demand is the design object of a lot of systems, and for example under 3GPP TD-SCDMA, system has adopted frame structure as shown in Figure 2:
Under this frame structure, system can change the resource allocation ratio of up-downgoing by the position that changes Switching point (up-downgoing change point), but stipulated that first business time-slot must be a descending time slot, second business time-slot must be ascending time slot, and all the other time slots can be configured to upstream or downstream according to the position difference of Switching point.
Though the scheme of a lot of dynamic adjustments up-downgoing resource allocations is arranged, when the single-frequency multi-cell networking, still can encounter problems, therefore in real system, many times still resource allocation has been fixed time, and do not reached real dynamic adjustments.
A wherein topmost problem is the interference problem of facing the minizone mutually.As shown in Figure 3, suppose that adjacent two sub-districts have all used the technology of dynamic adjustments uplink/downlink sub-carriers switching point, if the upstream and downstream business demand of these two sub-districts is also inequality, the professional switching point of the upstream and downstream of these two sub-districts will be also inconsistent so, the ascending time slot that a sub-district will occur at these two neighbor cells is the situation of the descending time slot of another sub-district like this, (descending after the arrangement of frame is earlier up also is same situation), this will introduce two types interference:
1, as shown in FIG., a terminal that belongs to sub-district 2 is sending upward signal at this moment, and another terminal that might belong to sub-district 1 is receiving downstream signal at this moment, if these two terminal distances are enough near, this upward signal can cover downstream signal, causes the terminal cisco unity malfunction of received signal.
2, another situation, sub-district 2 is just in received signal, and sub-district 1 is sending signal, the transmission signal of sub-district 1 will form the reception of sub-district 2 and disturb so.
Summary of the invention
The purpose of this invention is to provide the resource allocation methods in a kind of ofdm system, utilize the subcarrier allocation of OFDM symbol, system can be to a certain extent mixing system resource flexibly, and the up-downgoing of having managed to avoid simultaneously in the single-frequency multi-cell net to face the minizone is disturbed.
For achieving the above object, a kind of resource allocation methods in ofdm system comprises:
Frame structure is divided into fixedly ascender, fixedly descender and up/descending adjustable part;
Certain a part of resource is carried out segmentation on the frequency domain of up/descending adjustable part;
The up-downgoing business proportion is distributed by the scheduling of resource to this part resource in each sub-district.
The present invention has avoided interference as much as possible by having carried out the division of subchannel in the part that might produce the up-downgoing interference.So each sub-district is free to determine belong to the traffic direction of its UL-DL-PART, can adjust the up-downgoing business proportion to a certain extent rapidly, thereby bring certain professional flexibility ratio.Under the situation of needs, the resource that belongs to UL-DL-PART can be used in peritropous sub-district in a sub-district, thus the accommodation of further broaden business.In inside, sub-district, the traffic direction (UL or DL) of one's own UL-DL-PART part is adjusted, and the base station in the sub-district can be arranged fully voluntarily, needn't notify the upper level resource control part when each the adjustment.
Description of drawings
Fig. 1 is that system spectral resources is distributed schematic diagram;
Fig. 2 is the td-scdma frame assumption diagram;
Fig. 3 is that schematic diagram is disturbed in the neighbor cell up-downgoing when adopting dynamic adjustments business switching point;
Fig. 4 has only under the UL/DL-PART, a kind of possible frequency resource allocation scheme;
Fig. 5 is that DL/UL-PART segmentation number is 7 allocative decision schematic diagram;
Fig. 6 is the resource borrowing flow process: the minizone is controlled voluntarily;
Fig. 7 is resource borrowing flow process: RNC control;
Fig. 8 is an instance graph that contains the frame of 100 symbols;
Fig. 9 is a more complete resource borrowing process flow diagram.
Embodiment
In this article, the notion of sub-district and sector there is no remarkable difference, is applicable to that promptly the place of sub-district is equally applicable to the sector.As shown in Figure 1, from the time, except fixing ascender (UL-PART) and descender (DL-PART), but remainder is uplink and downlink distribution portion (DL-UL-PART), this part (DL-UL-PART) can be divided into several sections in time, intersperse among among UL-PART and the DL-PART, but the switching point of each sub-district should be consistent.In addition, UL-PART, DL-PART there is no fixing order, and in each DL-UL-PART, has carried out segmentation from frequency domain between the DL-UL-PART, these segmentations are given different sub-districts respectively by certain rule.
Below, be the arrangement scheme of having only a DL-UL-PART.As shown in Figure 4, the frame structure of each sub-district employing is all pressed following distribution.The entire frame structure is divided into 3 parts by the protection of two fixed positions interval (FG).
First part is a descender, called after DL-PART.Second part is up/descending adjustable part, called after DL-UL-PART.In the middle of this part, whole frequency domain has been divided into N segmentation.In principle, reach minimum in order to make presence of intercell interference, different segmentations will be distributed in adjacent sub-district.In order to improve power system capacity, also can adopt other technologies, as sign indicating number branch, empty branch technology, make neighbor cell use identical segmentation.
Fig. 5 is that a segments is 7 distribution schematic diagram.Cause interference between the segmentation for fear of each sub-district frequency difference, between each segmentation, can adopt certain frequency domain protection subcarrier at interval as protection.
The 3rd part is ascender, called after UL-PART.FG is up-downgoing protection interval, and its size (more than or equal to 0) can be set as required.
Among the present invention, and do not require that these three parts necessarily occur according to as shown in the figure order.In fact, DL-UL-PART can be placed on any position.Such as, following order also can: first part is an ascender, second part is up/descender, the 3rd part is descender, at this moment, consider the needs that up-downgoing is synchronous, the FG between first part and second part, and the FG between second part and the 3rd part, can omit.
Each sub-district is followed following strategy and is adjusted resource allocation:
1. can independently to select to belong among the DL-UL-PART its that part of resource be up or descending in each sub-district.Because different segmentation resources has been adopted in adjacent sub-district, therefore can not exist up-downgoing to disturb.
2. when a sub-district thinks that the resource of ownership itself can not have been satisfied the demand, can use the resource of DL-UL-PART to other sub-districts, using decision can be decided through consultation voluntarily by the minizone, also can between neighbor cell, do unified allocation of resources by the upper level control section to upper level control section application allocate resource.But the result who is noted that allotment still will guarantee adjacent minizone and use different segmentations.The upper level control section is a notion in logic, and it can be RNC etc.
Fig. 6 is the resource borrowing flow process: the minizone is controlled voluntarily.
Fig. 7 is resource borrowing flow process: RNC control.
Embodiment
As shown in Figure 8, suppose that a frame contains 100 OFDM symbols, wherein preceding 70 symbols are DL-PART, and 23 symbols in back are UL-PART, and middle 7 symbols are equally divided into 7 sections from frequency domain, and by Fig. 4 these segmentations are distributed the sub-district.In fact, the segmentation on the frequency domain can be uneven, does not hinder enforcement of the present invention, and the subcarrier of each segmentation can not be a continuous dispensing also.For ease of for example, be made as mean allocation herein.We claim that an OFDM symbol that has occupied all available subcarriers is a resource units.For the segmentation among the UL-DL-PART, by contrast, each segmentation has occupied 1/7 frequency and 7 times duration, also is a resource units therefore.
For one of them sub-district, its capacity has following different selection.
| 7 cell conditions | Have resource units (descending) | Have resource units (up) |
| Minimum | 70 | 23 |
| Normal condition | 71 | 23 |
| 70 | 24 | |
| Use the situation of n segmentation | 71+n | 23 |
| 70 | 24+n | |
| Maximum case | 77 | 23 |
| 70 | 30 |
Minimum is meant that this sub-district will belong to the situation that the resource of its DL-UL-PART is lent.
Normal condition is meant that this sub-district do not lend the situation of yet not borrowing resource.
The situation of using n segmentation is meant that a peritropous n sub-district, this sub-district successfully uses the situation of resource.
Maximum case is meant the situation that this sub-district can borrow resource all to use peripheral cell.
Most of situation is divided into two row, above delegation adjustable resource is made as descending situation, below delegation adjustable resource is made as upstream case.
As seen the bigger resource adjustments scope that obtained is compared in this sub-district with the method for fixed allocation resource.
The basic procedure of a possible resource borrowing is Fig. 9.
A sub-district A judges that this cell business volume may exceed the bearing capacity of this sub-district, so inquiry request is sent in peritropous sub-district, can inquiry use resource 9002, waits for that simultaneously other sub-districts reply 9006.Sub-district A peripheral cell is replied, and provides the information 9004 of adjustable resource.Sub-district A collects the response message 9008 of returning, and judges whether to exist the resource 9010 that can use, and basis for estimation is to redistribute the back neighbor cell can not produce up-downgoing and disturb.The scheduled time 9012 is then waited in the sub-district that if there is no satisfies condition, and attempts 9002 again.If exist to satisfy the sub-district of the condition of using, sub-district A resembles this sub-district and sends and use application information 9014, and waits for the arrival of news and return 9018.Receive the information table of the sub-district modification of using application information itself, and return confirmation.After sub-district A receives confirmation, just can use respective resources 9020, and the information table of modification simultaneously itself.
Claims (10)
1. resource allocation methods in ofdm system comprises:
Frame structure is divided into fixedly ascender, fixedly descender and up/descending adjustable part;
Certain a part of resource is carried out segmentation on the frequency domain of up/descending adjustable part;
The up-downgoing business proportion is distributed by the scheduling of resource to this part resource in each sub-district.
2. in accordance with the method for claim 1, it is characterized in that each sub-district is used some subcarriers adjacent with other segmentations as the frequency domain boundary belt when using segmentation.
3. in accordance with the method for claim 1, it is characterized in that the subcarrier in the segmentation is continuous physically.
4. in accordance with the method for claim 2, it is characterized in that, when resource allocation is carried out in each sub-district, give adjacent sub-district different segment assignments.
5. in accordance with the method for claim 1, when it is characterized in that scheduling of resource is carried out in the sub-district, for the segmentation that belongs to it, inside, sub-district can be decided this segmentation in its sole discretion and be used for uplink service or downlink business.
6. in accordance with the method for claim 1, when it is characterized in that scheduling of resource is carried out in the sub-district, can use the segmentation that belongs to neighbor cell.
7. in accordance with the method for claim 6, it is characterized in that, perhaps manage and control whether decision is formulated to other sub-districts to the segmentation of some sub-district by the unification of upper level resource management function module by the negotiation between the sub-district.
8. in accordance with the method for claim 1, it is characterized in that having protection at interval between the up-downgoing part.
9. in accordance with the method for claim 1, it is characterized in that the switching point that also comprises each sub-district is consistent.
10. in accordance with the method for claim 1, it is characterized in that the segmentation on frequency domain can be uneven.
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|---|---|---|---|
| CN 200410060177 CN1719816A (en) | 2004-07-09 | 2004-07-09 | Resource allocation methods in the ofdm system |
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| CN 200410060177 CN1719816A (en) | 2004-07-09 | 2004-07-09 | Resource allocation methods in the ofdm system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100512055C (en) * | 2006-06-28 | 2009-07-08 | 中国科学技术大学 | Mixed service resource distributing method for OFDM system |
| CN101212765B (en) * | 2006-12-29 | 2011-05-18 | 大唐移动通信设备有限公司 | Resource scheduling method and system |
| CN101242640B (en) * | 2007-02-08 | 2011-07-27 | 鼎桥通信技术有限公司 | Inter-cell interference restraint method, base station and system for restraining inter-cell interference |
| CN101364832B (en) * | 2007-08-08 | 2012-09-05 | 中兴通讯股份有限公司 | Adaptive switching method between spatial division multiplexing and code division multiplexing |
| CN101523942B (en) * | 2006-08-01 | 2013-03-13 | 诺基亚西门子通信有限公司 | Centralized radio resource allocation in communication networks |
| CN105191378A (en) * | 2013-03-07 | 2015-12-23 | 株式会社Ntt都科摩 | Wireless base station, user terminal, wireless communication system, and wireless communication method |
-
2004
- 2004-07-09 CN CN 200410060177 patent/CN1719816A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100512055C (en) * | 2006-06-28 | 2009-07-08 | 中国科学技术大学 | Mixed service resource distributing method for OFDM system |
| CN101523942B (en) * | 2006-08-01 | 2013-03-13 | 诺基亚西门子通信有限公司 | Centralized radio resource allocation in communication networks |
| CN101212765B (en) * | 2006-12-29 | 2011-05-18 | 大唐移动通信设备有限公司 | Resource scheduling method and system |
| CN101242640B (en) * | 2007-02-08 | 2011-07-27 | 鼎桥通信技术有限公司 | Inter-cell interference restraint method, base station and system for restraining inter-cell interference |
| CN101364832B (en) * | 2007-08-08 | 2012-09-05 | 中兴通讯股份有限公司 | Adaptive switching method between spatial division multiplexing and code division multiplexing |
| CN105191378A (en) * | 2013-03-07 | 2015-12-23 | 株式会社Ntt都科摩 | Wireless base station, user terminal, wireless communication system, and wireless communication method |
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