CN102026206B - Method and device for allocating low frequency-band frequency spectrum resources for TDD system - Google Patents
Method and device for allocating low frequency-band frequency spectrum resources for TDD system Download PDFInfo
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Abstract
The invention provides a method and a device for allocating low frequency-band frequency spectrum resources occupied by a frequency division duplex (FDD) system for a time division duplex (TDD) system in a communication system. The method comprises the following steps of: firstly, performing symmetric carrier aggregation on the FDD system in a low frequency band to generate aggregated low frequency-band frequency spectrum resources with symmetric uplink and downlink; secondly, determining an uplink traffic volume and a downlink traffic volume of the FDD system; thirdly, allocating the aggregated uplink low frequency-band frequency spectrum resources to the TDD system in partial time slots if the downlink traffic volume of the FDD system is greater than the uplink traffic volume of the FDD system, and allocating the resources to the FDD system in the residual time slots; and fourthly, allocating the aggregated downlink low frequency-band frequency spectrum resources to the TDD system in partial time slots if the uplink traffic volume of the FDD system is greater than the downlink traffic volume of the FDD system, and allocating the resources to the FDD system in the residual time slots.
Description
Technical field
The present invention relates to communication system, relate in particular in communication system and to be the method and apparatus of time division duplex (TimeDivision Duplex, TDD) system assignment low-frequency range frequency spectrum resource.
Background technology
Super three generations (B3G) mobile communication system will be supported Frequency Division Duplexing (FDD) (Frequency DivisionDuplex, FDD) and time division duplex (Time Division Duplex, TDD) dual mode.Wherein, FDD transmits on two symmetric channels that separate, and needs paired frequency spectrum, separates the uplink and downlink data with the protection frequency range.FDD can take full advantage of the frequency spectrum of up-downgoing when supporting symmetrical service, but when supporting non-symmetrical service, the availability of frequency spectrum will reduce greatly.TDD transmits on same channel, separates the uplink and downlink data with the time.TDD can the flexible configuration frequency spectrum, can also support well non-symmetrical service by adjusting uplink and downlink timeslot ratio, has stronger advantage in next generation mobile communication system.
Yet in international the division, the TDD frequency spectrum resource is deficienter at present, and mainly is arranged in high band, and propagation characteristic is relatively poor.Propagation characteristic low-frequency range is preferably all distributed to the FDD system basically.And, to consider from the angle of network evolution, this part low-frequency range frequency spectrum need to keep for the follow-up developments of FDD.So, for the TDD system, do not have enough low band frequencies to solve the covering problem of low-density and remote districts existence.To greatly increase the network design cost if solve the covering problem in low-density area with existing high band.Sustainable development is very disadvantageous to TDD for this.
In addition, according to the rules, the B3G mobile communication system requires support up to the spectral bandwidth of 100M, and these frequency spectrums may be dispersed in a lot of scattered passages, these frequency spectrums need to be gathered use.Carrier aggregation (component carrier aggregation, CA) technology can address this problem, and namely system can send or receive data on a plurality of frequency ranges simultaneously according to the practical capacity of oneself, satisfies larger bandwidth demand.The lack of uniformity of spectrum allocation may has consisted of the restriction to the TDD development, and carrier aggregation technology will be to make up this unbalanced rare opportunity.Along with the continuous increase of wireless system, it is more and more difficult, more and more discrete that the distribution of frequency spectrum will become, and this more needs rationally to use flexibly carrier aggregation technology.Bandwidth requirement is namely satisfied in design, can realize that again the carrier aggregation technology of wide area covering will become the research emphasis of TDD.
At present, the TDD carrier aggregation can also can polymerization on discontinuous carrier in polymerization on continuous carrier, and the continuous carrier polymerization realizes simple, and the discontinuous carrier polymerization has more flexibility.Discontinuous carrier can be in same frequency range, also can be in different frequency range.Discontinuous carrier is polymerized to the TDD system and provides and use the ability of low-frequency range frequency spectrum, but needs in use to consider and the coexisting of FDD carrier aggregation technology.
Reached some common recognitions about carrier aggregation technology, as: up-downgoing can the different number different bandwidths of polymerization carrier wave.Consider the characteristics of non-symmetrical service and up-downgoing to the different requirements of peak rate, FDD will support symmetrical carrier aggregation and asymmetric carrier aggregation technology.For symmetrical carrier aggregation, the up-downgoing carrier wave all is consistent on bandwidth or number, meets the regulation of traditional standard, but when supporting non-symmetrical service, can cause the waste of frequency spectrum resource.For asymmetric carrier aggregation, can converge the carrier wave of different number different bandwidths.For example, can join together to provide downlink data transmission by two carrier waves, and only have a carrier wave that transmitting uplink data is provided, form asymmetrical upstream and downstream bandwidth.Take the carrier wave of 20MHz bandwidth as example, when adopting asymmetric polymerization, consist of the 20MHz down link by the carrier wave of two 10MHz, and consist of up link by the carrier wave of single 10MHz.Like this, FDD both can support the non-symmetrical service demand, also can save the 10MHz uplink frequency spectrum resource that distributes in pairs.
From the above, when FDD adopts asymmetric carrier aggregation in low-frequency range, can save the frequency spectrum resource that a part has been distributed.Such as, two E-UTRA FDD frequency ranges: a frequency range is that descending 746MHz-756MHz and up 777MHz-787MHz are expressed as respectively D1 and U1; Another frequency range is that descending 875MHz-885MHz and up 830MHz-840MHz are expressed as respectively D2 and U2.In asymmetric carrier aggregation, D1 and D2 form the downlink bandwidth of FDD, and U1 forms the upstream bandwidth of FDD.At this moment, U2 is with the free time.If TDD can utilize the U2 frequency range, just can alleviate the covering problem of low-density and remote districts, save the networking cost.But because TDD adopts the transmission of time slot differentiating uplink and downlink, the TDD carrier wave will produce with adjacent FDD up-link carrier and intersect interference, and system can't be worked.In addition, FDD uses asymmetric carrier aggregation, has destroyed traditional up-downgoing carrier wave relation one to one, and this can bring many problems, and as the backwards compatibility aspect, traditional FDD user only supports up-downgoing carrier spacing of fixing; Control channel aspect and for example, the processes such as the mapping of ack/nack signal and random access all need to do larger change.
Therefore, how to solve the carrier aggregation of TDD and FDD in the coexistence problems of low-frequency range, become problem in the urgent need to address.
Summary of the invention
Existing defective when using asymmetric carrier aggregation in view of the above-mentioned FDD system of mentioning, technical scheme of the present invention are based on the FDD system and use this prerequisite of symmetrical carrier aggregation to propose.The FDD system uses symmetrical carrier aggregation technology in low-frequency range, with mode polymerization up-link carrier (up low-frequency range frequency spectrum resource) and the descending carrier (descending low-frequency range frequency spectrum resource) of symmetry.When the upstream traffic of FDD system and downlink traffic when asymmetric, for example, the downlink traffic of FDD system is during greater than upstream traffic, adopt the up low-frequency range frequency spectrum resource of symmetrical carrier aggregation technology institute polymerization to distribute to respectively the FDD system and the TDD system uses with the time-division sharing mode, namely, on the part time slot of this up low-frequency range frequency spectrum resource, by FDD system transmissions upstream data, and on the remaining time slots of this up low-frequency range frequency spectrum resource, by TDD system transmissions uplink and downlink data, thereby realize that the time-division shared.Vice versa.
Thus, the TDD system realizes sharing the low-frequency range frequency spectrum resource with the FDD system in the mode of time-division, thereby has effectively solved the TDD system at the covering Cost Problems of low-density and remote districts, has also improved the availability of frequency spectrum of rare low-frequency resources.
Concrete, the present invention provide in one embodiment a kind of in communication system the method for the shared low-frequency range frequency spectrum resource of TDD system assignment FDD system, it is characterized in that, said method comprising the steps of: a. carries out the symmetrical carrier aggregation of described FDD system in low-frequency range, to generate the low-frequency range frequency spectrum resource of the up-downgoing symmetry after polymerization; B. judge the uplink and downlink traffic carrying capacity of described FDD system; If c. the downlink traffic of described FDD system is greater than its upstream traffic, the up low-frequency range frequency spectrum resource after described polymerization is distributed to described TDD system in the part time slot, and distributed to described FDD system in remaining time slots; If d. the upstream traffic of described FDD system is greater than its downlink traffic, the descending low-frequency range frequency spectrum resource after described polymerization is distributed to described TDD system in the part time slot, and distributed to described FDD system in remaining time slots.
Optionally, described step c comprises also that with cycle T the up low-frequency range frequency spectrum resource after with described polymerization distributes to respectively described FDD system and described TDD system, wherein, and T=T
FDD+ T
TDD, wherein, T
FDDBe illustrated in and be the time slot of described FDD system assignment, 0≤T in described cycle T
FDD≤ T; T
TDDBe illustrated in and be the time slot of described TDD system assignment, 0≤T in described cycle T
TDD≤ T.
Optionally, described steps d comprises also that with cycle T the descending low-frequency range frequency spectrum resource after with described polymerization distributes to respectively described FDD system and described TDD system, wherein, and T=T
FDD+ T
TDD, wherein, T
FDDBe illustrated in and be the time slot of described FDD system assignment, 0≤T in described cycle T
FDD≤ T; T
TDDBe illustrated in and be the time slot of described TDD system assignment, 0≤T in described cycle T
TDD≤ T.
Optionally, described method is further comprising the steps of: according to the current business amount of described FDD system and described TDD system, be adjusted into the time slot T of described FDD system assignment in described cycle T
FDDWith the time slot T that is described TDD system assignment
TDD
Optionally, the uplink and downlink data are transmitted in described TDD system on the frequency spectrum resource of assigned described part time slot with the tdd frame structure.
The present invention provide in another embodiment a kind of in communication system the resource allocation device for the shared low-frequency range frequency spectrum resource of TDD system assignment FDD system, it is characterized in that, described resource allocation device comprises: the first distributor, be used for carrying out in low-frequency range the symmetrical carrier aggregation of described FDD system, to generate the low-frequency range frequency spectrum resource of the up-downgoing symmetry after polymerization; Judgment means is used for judging the uplink and downlink traffic carrying capacity of described FDD system; The second distributor if the downlink traffic that is used for described FDD system greater than its upstream traffic, is distributed to the up low-frequency range frequency spectrum resource after described polymerization described TDD system in the part time slot, and is distributed to described FDD system in remaining time slots; If the upstream traffic of described FDD system greater than its downlink traffic, is distributed to the descending low-frequency range frequency spectrum resource after described polymerization described TDD system in the part time slot, and distribute to described FDD system in remaining time slots.
Optionally, if described the second distributor also is used for the downlink traffic of described FDD system greater than its upstream traffic, the up low-frequency range frequency spectrum resource after with described polymerization is distributed to respectively described FDD system and described TDD system with cycle T; If the upstream traffic of described FDD system is greater than its downlink traffic, the descending low-frequency range frequency spectrum resource after with described polymerization is distributed to respectively described FDD system and described TDD system with cycle T, wherein, and T=T
FDD+ T
TDD, wherein, T
FDDBe illustrated in and be the time slot of described FDD system assignment, 0≤T in described cycle T
FDD≤ T; T
TDDBe illustrated in and be the time slot of described TDD system assignment, 0≤T in described cycle T
TDD≤ T.
Optionally, clearance adjustment apparatus when described resource allocation device also comprises is used for the current business amount according to described FDD system and described TDD system, is adjusted into the time slot T of described FDD system assignment in described cycle T
FDDWith the time slot T that is described TDD system assignment
TDD
Optionally, the uplink and downlink data are transmitted in described TDD system on the frequency spectrum resource of assigned described part time slot with the tdd frame structure.
There is following advantage in the method and apparatus of the application of the invention:
1) can make up the TDD system because frequency is distributed the unbalanced performance loss that causes;
2) can satisfy the TDD system to the more requirement of high bandwidth, also help the TDD system to solve the covering Cost Problems of low-density and remote districts;
3) can provide the non-symmetrical service support for FDD.And can keep the one-to-one relationship of up-downgoing carrier wave, have backwards compatibility;
4) can realize FDD and TDD coexistence of systems in low-frequency range, this helps operator to utilize separately frequency spectrum resource to dispose flexibly FDD and TDD system.
Various aspects of the present invention are with the explanation of the specific embodiment by hereinafter and more clear.
Description of drawings
By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, above-mentioned and other feature of the present invention will become more apparent:
Fig. 1 show according to an embodiment of the invention in communication system the method flow diagram for the shared low-frequency range frequency spectrum resource of TDD system assignment FDD system;
Fig. 2 shows TDD system according to an embodiment of the invention and the schematic diagram of low-frequency range frequency spectrum resource is shared by the FDD system with time division way;
Fig. 3 shows according to the LTE-AdvancedTDD system of a specific embodiment of the present invention and FDD system and shares the schematic diagram of low-frequency range frequency spectrum resource with time division way;
Fig. 4 show according to another embodiment of the invention be the structured flowchart of the resource allocation device of the shared low-frequency range frequency spectrum resource of TDD system assignment FDD system in communication system.
In accompanying drawing, same or analogous mark is used for representing same or analogous step or device.
Embodiment
Need to prove, technical scheme of the present invention is based on the FDD system and uses symmetrical carrier aggregation technology, so that the up-downgoing carrier wave after polymerization can keep one-to-one relationship, also, the up-downgoing carrier wave all is consistent on bandwidth or on number.
The FDD system uses symmetrical carrier aggregation technology in low-frequency range, with mode polymerization up-link carrier (up low-frequency range frequency spectrum resource) and the descending carrier (descending low-frequency range frequency spectrum resource) of symmetry.Asymmetric when upstream traffic and the downlink traffic of FDD system, for example, the downlink traffic of FDD system is during greater than upstream traffic, adopts the descending low-frequency range frequency spectrum resource of symmetrical carrier aggregation technology institute polymerization all to distribute to FDD system transmissions downlink data; And the up low-frequency range frequency spectrum resource of institute's polymerization will be distributed to respectively the FDD system and the TDD system uses with the time-division sharing mode, namely, on the part time slot of this up low-frequency range frequency spectrum resource, by FDD system transmissions upstream data, and on the remaining time slots of this up low-frequency range frequency spectrum resource, by TDD system transmissions uplink and downlink data, thereby realize the time-division of the up low-frequency range frequency spectrum resource after this polymerization is shared.
And when the upstream traffic of FDD system during greater than downlink traffic, adopt the up low-frequency range frequency spectrum resource of symmetrical carrier aggregation technology institute polymerization all to distribute to FDD system transmissions upstream data; And the descending low-frequency range frequency spectrum resource of institute's polymerization will be distributed to respectively the FDD system and the TDD system uses with the time-division sharing mode, namely, on the part time slot of this descending low-frequency range frequency spectrum resource, by FDD system transmissions downlink data, and on the remaining time slots of this descending low-frequency range frequency spectrum resource, by TDD system transmissions uplink and downlink data, thereby realize the time-division of the descending low-frequency range frequency spectrum resource after this polymerization is shared.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 show according to an embodiment of the invention in communication system the method flow diagram for the shared low-frequency range frequency spectrum resource of TDD system assignment FDD system.
At first, in step S11, carry out the symmetrical carrier aggregation of described FDD system in low-frequency range, to generate the low-frequency range frequency spectrum resource of the up-downgoing symmetry after polymerization.
The symmetrical carrier aggregation technology of FDD system use is carried out polymerization to the carrier wave of low-frequency range, up-downgoing carrier wave after institute's polymerization, that is, up-downgoing low-frequency range frequency spectrum resource meets symmetric relation, namely, the up-downgoing carrier wave after institute's polymerization all is consistent on bandwidth or on number.
Secondly, in step S12, judge the uplink and downlink traffic case of this FDD system.
Under the situation of non-symmetrical service, the up-downgoing traffic carrying capacity of FDD system is not mated.
If the downlink traffic of this FDD system in step S13, is distributed to the TDD system with the up low-frequency range frequency spectrum resource after polymerization, and distribute to the FDD system in remaining time slots greater than its upstream traffic in the part time slot.
If the upstream traffic of this FDD system in step S14, is distributed to the TDD system with the descending low-frequency range frequency spectrum resource after polymerization, and distribute to the FDD system in remaining time slots greater than its downlink traffic in the part time slot.
Below in conjunction with Fig. 2, adopt two carrier aggregation method shown in Figure 1 to be described as example take the FDD system.Need to prove, be only to adopt two carrier aggregation as example take the FDD system in Fig. 2, one of ordinary skill in the art will appreciate that, technical scheme of the present invention is not limited to two carrier aggregation, it is equally applicable to multi-carrier polymerizing, and for simplicity's sake, therefore not to repeat here.
In Fig. 2, abscissa represents time shaft (t), and ordinate represents frequency axis (f).CC1, CC2, CC3, CC4 represent the low-frequency range carrier wave, C5, C6 represent the high band carrier wave.
In figure, low-frequency range carrier wave CC1, CC2 carries out polymerization, the descending low-frequency range frequency spectrum resource after the generation polymerization; Low-frequency range carrier wave CC3, CC4 carries out polymerization, the up low-frequency range frequency spectrum resource after the generation polymerization.Wherein, the up-downgoing carrier wave after polymerization meets symmetric relation, and namely the up-downgoing carrier wave all is being consistent on bandwidth He on number.
In Fig. 2 take the downlink traffic of FDD system greater than upstream traffic as example.Low-frequency range carrier wave CC1, the descending low-frequency range frequency spectrum resource after the CC2 polymerization only provide the transmission of downlink data for the FDD system; And low-frequency range carrier wave CC3, the up low-frequency range frequency spectrum resource after the CC4 polymerization is distributed to the TDD system and is used for transmission uplink and downlink data in the part time slot, be used for carrying out the transmission of upstream data and distribute to the FDD system in remaining time slots.
Concrete, as shown in Figure 2, FDD system and TDD system take by carrier wave CC3 with the cycle T timesharing, the up low-frequency range frequency spectrum resource after the CC4 polymerization.
Wherein, T=T
FDD+ T
TDD, T
FDDBe expressed as the time slot of FDD system assignment, FDD system transmit ascending data on the time slot that distributes, 0≤T
FDD≤ T; T
TDDBe expressed as the time slot of TDD system assignment, uplink and downlink data, 0≤T are transmitted in the TDD system on the time slot that distributes
TDD≤ T.
Need to prove, at assigned time slot T
TDDOn, the TDD system is with tdd frame structural transmission uplink and downlink data.
Another need to prove, in Fig. 2 is only to describe as example greater than upstream traffic take the downlink traffic of FDD system.One of ordinary skill in the art will appreciate that, when the upstream traffic of FDD system during greater than downlink traffic, FDD system and TDD system will take by the descending low-frequency range frequency spectrum resource after carrier wave CC1 and CC2 polymerization with the cycle T timesharing.
In one-period T, be the time slot T of FDD system assignment
FDDAnd be the time slot T of TDD system assignment
TDDThat current business amount according to FDD system and TDD system determines.
And, in one-period T, T
FDDWith T
TDDRatio can adjust in real time according to the traffic case of current FDD system and TDD system.If the traffic carrying capacity of current FDD system increases, so, can correspondingly increase T
FDDWith T
TDDRatio, namely in one-period T, increase to the time slot T of FDD system assignment
FDD, also namely be reduced to the time slot T of TDD system assignment
TDDAnd if the traffic carrying capacity of current TDD system increases, so, can correspondingly reduce T
FDDWith T
TDDRatio, namely in one-period T, increase to the time slot T of TDD system assignment
TDD, also namely be reduced to the time slot T of FDD system assignment
FDD
Need to prove, under the very large situation of current FDD system business amount, in one-period T, all time slots all can be distributed to the FDD system and be used for transmit ascending data; And under the very large situation of traffic carrying capacity of current TDD system, in one-period T, also all time slots all can be distributed to the TDD system and be used for transmission uplink and downlink data.
As shown in Figure 2, by using technical scheme of the present invention, the TDD system is except high band carries out the polymerization of carrier wave CC5 and CC6, also realized in the mode of time-division, the frequency spectrum resource of low-frequency range being carried out polymerization, thereby effectively solved the TDD system at the covering Cost Problems of low-density and remote districts, also improved the availability of frequency spectrum of rare low-frequency resources.
Below in conjunction with Fig. 3, a specific embodiment of the present invention is described.Wherein, the description of Fig. 1 and Fig. 2 is incorporated herein by reference.
Be take LTE-Advanced TDD carrier convergence as example describes in Fig. 3, one of ordinary skill in the art will appreciate that, technical scheme of the present invention is equally applicable in the B3G TDD system of other types.
In Fig. 3, abscissa represents time shaft (t), and ordinate represents frequency axis (f).CC1, CC2, CC3, CC4 represent the low-frequency range carrier wave, C5, C6 represent the high band carrier wave.
As definition in LTE (Long Term Evolution, Long Term Evolution), LTE-AdvancedFDD and tdd frame structure are every frame 10ms, comprise the subframe of 10 1ms.Different from the FDD frame structure, TDD comprises a special subframe S, is used for the configuration of GP (the TDD system comes downwards to the guard time interval of up conversion).In figure, ' D ' represents descending sub frame, and ' U ' represents sub-frame of uplink, and ' S ' represents special subframe.
In this embodiment, for the FDD system, adopt symmetrical carrier aggregation technology, low-frequency range carrier wave CC1 and the CC2 polymerization of two 20MHz of descending employing are to generate descending low-frequency range frequency spectrum resource; Up low-frequency range carrier wave CC3 and the CC4 polymerization of also adopting two 20MHz is to generate up low-frequency range frequency spectrum resource.
In Fig. 3, in same non-symmetrical service with the FDD system, downlink traffic is that example describes greater than upstream traffic.
Greater than upstream traffic, therefore, only be used for FDD system transmissions downlink data by the descending low-frequency range frequency spectrum resource that generates after low-frequency range carrier wave CC1 and CC2 polymerization due to downlink traffic in the FDD system; Shared in the mode of time-division by TDD system and FDD system by the up low-frequency range frequency spectrum resource that generates after low-frequency range carrier wave CC3 and CC4 polymerization, namely, by low-frequency range carrier wave CC3, up low-frequency range frequency spectrum resource after the CC4 polymerization is distributed to the TDD system and is used for transmission uplink and downlink data in the part time slot, be used for carrying out the transmission of upstream data and distribute to the FDD system in remaining time slots.
Need to prove, if in the FDD system, upstream traffic is greater than downlink traffic, so, only is used for FDD by the up low-frequency range frequency spectrum resource that generates after low-frequency range carrier wave CC3 and CC4 polymerization and carries out the transmission of upstream data; And it is shared in the mode of time-division by TDD system and FDD system by the descending low-frequency range resource that generates after low-frequency range carrier wave CC1 and CC2 polymerization, namely, distribute to the TDD system by the descending low-frequency range resource after low-frequency range carrier wave CC1 and CC2 polymerization in the part time slot and be used for transmission uplink and downlink data, be used for carrying out the transmission of downlink data and distribute to the FDD system in remaining time slots.
In Fig. 3, adopt frame structure 1 with TDD, support that the sub-frame allocation of 2DL:2UL is example.Need to prove, be only to adopt frame structure 1 as example describes take TDD in Fig. 3, one of ordinary skill in the art will appreciate that, technical scheme of the present invention equally also is applicable to the form that the TDD system adopts other frame structures, and for simplicity's sake, therefore not to repeat here.
The TDD system is except carrying out at high band carrier wave CC5 and CC6 polymerization, also with the FDD system with cycle T=10ms, timesharing takies by the up low-frequency range frequency spectrum resource after low-frequency range carrier wave CC3 and CC4 polymerization.
Concrete, on by the up low-frequency range frequency spectrum resource after low-frequency range carrier wave CC3 and CC4 polymerization, in one-period T=10ms, be the time slot T that is used for carrying out transmitting uplink data of FDD system assignment
FDD=5ms; The time slot T that is used for transmission uplink and downlink data for the TDD system assignment
TDD=5ms.Also namely, in one-period T=10ms, T
FDDWith T
TDDRatio equal 1.
Need to prove, be only with in one-period T=10ms in Fig. 3, T
FDD=5ms, T
TDD=5ms is example.One with ordinary skill in the art would appreciate that in one-period T=10ms, be the time slot T of FDD system assignment
FDDAnd be the time slot T of TDD system assignment
TDDBe not limited to the size shown in Fig. 3, its concrete numerical values recited is decided according to the traffic case of current FDD system and TDD system.
In addition, at the time slot T that distributes for the TDD system
TDDOn, the TDD system is still with tdd frame structural transmission uplink and downlink data.
Need to prove, in one-period T=10ms, be the time slot T that is used for carrying out transmitting uplink data of FDD system assignment
FDDAnd be the time slot T that is used for transmission uplink and downlink data of TDD system assignment
TDDCan adjust in real time according to the traffic case of current FDD system and TDD system.
If the traffic carrying capacity of current FDD system increases, in one-period T=10ms, can correspondingly increase to the time slot T that the FDD system distributes
FDD, be reduced to simultaneously the time slot T that the TDD system distributes
TDD, also namely increase T
FDDWith T
TDDRatio; And if the traffic carrying capacity of current TDD system increases, in one-period T=10ms, can correspondingly increase to the time slot T that the TDD system distributes
TDD, be reduced to simultaneously the time slot T that the FDD system distributes
FDD, also namely reduce T
FDDWith T
TDDRatio.
Need to prove, under the very large situation of current FDD system business amount, in one-period T=10ms, all time slot 10ms all can be distributed to the FDD system and be used for carrying out the transmission of upstream data; And under the very large situation of traffic carrying capacity of current TDD system, in one-period T=10ms, also all time slot 10ms all can be distributed to the TDD system and be used for transmission uplink and downlink data.
Above angle from method step is described technical scheme of the present invention, below will technical scheme of the present invention be further described from the angle of apparatus module.
Fig. 4 show according to another embodiment of the invention be the structured flowchart of the resource allocation device of the shared low-frequency range frequency spectrum resource of TDD system assignment FDD system in communication system.
In figure, resource allocation device 40 comprises the first distributor 401, judgment means 402 and the second distributor 403.
Concrete, in Fig. 4, the first distributor 401 in resource allocation device 40 is used for carrying out in low-frequency range the symmetrical carrier aggregation of described FDD system, to generate the low-frequency range frequency spectrum resource of the up-downgoing symmetry after polymerization.
The symmetrical carrier aggregation technology of FDD system use is carried out polymerization to the carrier wave of low-frequency range, up-downgoing carrier wave after institute's polymerization, that is, up-downgoing low-frequency range frequency spectrum resource meets symmetric relation, namely, the up-downgoing carrier wave after institute's polymerization all is consistent on bandwidth or on number.
Judgment means 402 in resource allocation device 40 is used for judging the uplink and downlink traffic carrying capacity of described FDD system.
Under the situation of non-symmetrical service, the up-downgoing traffic carrying capacity of FDD system is not mated.
If the downlink traffic of described FDD system is greater than its upstream traffic, the second distributor 403 in resource allocation device 40 is used for the up low-frequency range frequency spectrum resource after described polymerization is distributed to described TDD system in the part time slot, and distribute to described FDD system in remaining time slots, be also, up low-frequency range frequency spectrum resource after described polymerization is distributed to the TDD system and is used for transmission uplink and downlink data in the part time slot, be used for carrying out the transmission of upstream data and distribute to the FDD system in remaining time slots.
If the upstream traffic of described FDD system is greater than its downlink traffic, the descending low-frequency range frequency spectrum resource of the second distributor 403 in resource allocation device 40 after with described polymerization distributed to described TDD system in the part time slot, and distribute to described FDD system in remaining time slots, be also, descending low-frequency range frequency spectrum resource after described polymerization is distributed to the TDD system and is used for transmission uplink and downlink data in the part time slot, be used for carrying out the transmission of downlink data and distribute to the FDD system in remaining time slots.
Optionally, if the downlink traffic of described FDD system is greater than its upstream traffic, the second distributor 403 in resource allocation device 40 also is used for cycle T the up low-frequency range frequency spectrum resource after with described polymerization and distributes to respectively described FDD system and described TDD system.
If the upstream traffic of described FDD system is greater than its downlink traffic, the second distributor 403 in resource allocation device 40 with cycle T the descending low-frequency range frequency spectrum resource after with described polymerization distribute to respectively described FDD system and described TDD system.
Wherein, T=T
FDD+ T
TDD, wherein, T
FDDBe illustrated in and be the time slot of described FDD system assignment, 0≤T in described cycle T
FDD≤ T; T
TDDBe illustrated in and be the time slot of described TDD system assignment, 0≤T in described cycle T
TDD≤ T.
Optionally, the uplink and downlink data are transmitted in described TDD system on the frequency spectrum resource of assigned described part time slot with the tdd frame structure.
Optionally, clearance adjustment apparatus when resource allocation device 40 also comprises (for simplicity's sake, not shown in Fig. 4) is used for the current business amount according to described FDD system and described TDD system, is adjusted into the time slot T of described FDD system assignment in described cycle T
FDDWith the time slot T that is described TDD system assignment
TDD
If the traffic carrying capacity of current FDD system increases, so, the time clearance adjustment apparatus in resource allocation device 40 can correspondingly increase T
FDDWith T
TDDRatio, namely in one-period T, increase to the time slot T of FDD system assignment
FDD, also namely be reduced to the time slot T of TDD system assignment
TDDAnd if the traffic carrying capacity of current TDD system increases, so, the time clearance adjustment apparatus in resource allocation device 40 can correspondingly reduce T
FDDWith T
TDDRatio, namely in one-period T, increase to the time slot T of TDD system assignment
TDD, also namely be reduced to the time slot T of FDD system assignment
FDD
Need to prove, under the very large situation of current FDD system business amount, in one-period T, the time clearance adjustment apparatus in resource allocation device 40 can all be distributed to all time slots the FDD system and be used for transmit ascending data; And under the very large situation of traffic carrying capacity of current TDD system, in one-period T, the time clearance adjustment apparatus in resource allocation device 40 also can all be distributed to all time slots the TDD system and be used for transmission uplink and downlink data.
By using method of the present invention and resource allocation device, can 1) make up the TDD system because frequency is distributed the unbalanced performance loss that causes; 2) satisfy the TDD system to the more requirement of high bandwidth, also help the TDD system to solve the covering Cost Problems of low-density and remote districts; 3) for FDD provides the non-symmetrical service support, and can keep the one-to-one relationship of up-downgoing carrier wave, have backwards compatibility; 4) realize FDD and TDD coexistence of systems in low-frequency range, this helps operator to utilize separately frequency spectrum resource to dispose flexibly FDD and TDD system.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and in the situation that do not deviate from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, therefore is intended to include in the present invention dropping on the implication that is equal to important document of claim and all changes in scope.Any Reference numeral in claim should be considered as limit related claim.In addition, obviously other unit or step do not got rid of in " comprising " word, and odd number is not got rid of plural number.A plurality of unit of stating in system's claim or device also can be realized by software or hardware by a unit or device.The first, the second word such as grade is used for representing title, and does not represent any specific order.
Claims (9)
1. one kind is the method for the shared low-frequency range frequency spectrum resource of TDD system assignment FDD system in communication system, it is characterized in that, said method comprising the steps of:
A. carry out the symmetrical carrier aggregation of described FDD system in low-frequency range, to generate the low-frequency range frequency spectrum resource of the up-downgoing symmetry after polymerization;
B. judge the uplink and downlink traffic carrying capacity of described FDD system;
If c. the downlink traffic of described FDD system is greater than its upstream traffic, the up low-frequency range frequency spectrum resource after described polymerization is distributed to described TDD system in the part time slot, and distributed to described FDD system in remaining time slots;
If d. the upstream traffic of described FDD system is greater than its downlink traffic, the descending low-frequency range frequency spectrum resource after described polymerization is distributed to described TDD system in the part time slot, and distributed to described FDD system in remaining time slots.
2. method according to claim 1, is characterized in that, described step c comprises also that with cycle T the up low-frequency range frequency spectrum resource after with described polymerization distributes to respectively described FDD system and described TDD system,
Wherein, T=T
FDD+ T
TDD, wherein, T
FDDBe illustrated in and be the time slot of described FDD system assignment, 0≤T in described cycle T
FDD≤ T; T
TDDBe illustrated in and be the time slot of described TDD system assignment, 0≤T in described cycle T
TDD≤ T.
3. method according to claim 1, is characterized in that, described steps d comprises also that with cycle T the descending low-frequency range frequency spectrum resource after with described polymerization distributes to respectively described FDD system and described TDD system,
Wherein, T=T
FDD+ T
TDD, wherein, T
FDDBe illustrated in and be the time slot of described FDD system assignment, 0≤T in described cycle T
FDD≤ T; T
TDDBe illustrated in and be the time slot of described TDD system assignment, 0≤T in described cycle T
TDD≤ T.
4. method according to claim 3, is characterized in that, and is further comprising the steps of:
-according to the current business amount of described FDD system and described TDD system, be adjusted into the time slot T of described FDD system assignment in described cycle T
FDDWith the time slot T that is described TDD system assignment
TDD
5. method according to claim 1, is characterized in that, the uplink and downlink data are transmitted in described TDD system on the frequency spectrum resource of assigned described part time slot with the tdd frame structure.
6. one kind is the resource allocation device of the shared low-frequency range frequency spectrum resource of TDD system assignment FDD system in communication system, it is characterized in that, described resource allocation device comprises:
The first distributor is used for carrying out in low-frequency range the symmetrical carrier aggregation of described FDD system, to generate the low-frequency range frequency spectrum resource of the up-downgoing symmetry after polymerization;
Judgment means is used for judging the uplink and downlink traffic carrying capacity of described FDD system;
The second distributor if the downlink traffic that is used for described FDD system greater than its upstream traffic, is distributed to the up low-frequency range frequency spectrum resource after described polymerization described TDD system in the part time slot, and is distributed to described FDD system in remaining time slots; If the upstream traffic of described FDD system greater than its downlink traffic, is distributed to the descending low-frequency range frequency spectrum resource after described polymerization described TDD system in the part time slot, and distribute to described FDD system in remaining time slots.
7. resource allocation device according to claim 6, it is characterized in that, if described the second distributor also is used for the downlink traffic of described FDD system greater than its upstream traffic, the up low-frequency range frequency spectrum resource after with described polymerization is distributed to respectively described FDD system and described TDD system with cycle T; If the upstream traffic of described FDD system is greater than its downlink traffic, the descending low-frequency range frequency spectrum resource after with described polymerization is distributed to respectively described FDD system and described TDD system with cycle T,
Wherein, T=T
FDD+ T
TDD, wherein, T
FDDBe illustrated in and be the time slot of described FDD system assignment, 0≤T in described cycle T
FDD≤ T; T
TDDBe illustrated in and be the time slot of described TDD system assignment, 0≤T in described cycle T
TDD≤ T.
8. resource allocation device according to claim 7, it is characterized in that, clearance adjustment apparatus when described resource allocation device also comprises is used for the current business amount according to described FDD system and described TDD system, is adjusted into the time slot T of described FDD system assignment in described cycle T
FDDWith the time slot T that is described TDD system assignment
TDD
9. resource allocation device according to claim 6, is characterized in that, the uplink and downlink data are transmitted in described TDD system on the frequency spectrum resource of assigned described part time slot with the tdd frame structure.
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| GB2568835B (en) * | 2012-10-21 | 2019-12-25 | Goldhamer Mariana | Downlink communication in the uplink FDD channel |
| CN104579596B (en) * | 2013-10-28 | 2018-02-16 | 中国电信股份有限公司 | FDD LTE and the HARQ sequential implementation method and equipment of TDD LTE carrier aggregations |
| CN105101421B (en) * | 2014-05-09 | 2019-10-11 | 宇龙计算机通信科技(深圳)有限公司 | Resource allocation methods and resource allocation device |
| WO2016037305A1 (en) | 2014-09-08 | 2016-03-17 | Qualcomm Incorporated | Flexible transmissions on one or more frequency division duplexing resources |
| GB2530511A (en) * | 2014-09-24 | 2016-03-30 | Vodafone Ip Licensing Ltd | Inter-mode carrier aggregation |
| CN105553605B (en) * | 2014-11-04 | 2019-04-05 | 中国电信股份有限公司 | Communication means, system and base station and terminal |
| CN106550460B (en) * | 2015-09-18 | 2020-04-03 | 成都鼎桥通信技术有限公司 | Method and equipment for uplink scheduling in asymmetric carrier aggregation |
| CN109151877A (en) * | 2017-06-27 | 2019-01-04 | 大唐移动通信设备有限公司 | The configuration method and device of secondary carrier in a kind of polymerization of carrier wave |
| ES2962343T3 (en) | 2017-12-28 | 2024-03-18 | Beijing Xiaomi Mobile Software Co Ltd | Data transmission method, base station and terminal |
| US11291038B2 (en) * | 2020-02-21 | 2022-03-29 | Arris Enterprises Llc | Dynamic grant switch |
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