CN101404539A - Data transmission method for mixed time division duplex large band width system - Google Patents

Abstract

The invention provides a data transmission method for a hybrid time division duplex large-bandwidth system. The spectrum resource of the time division duplex bandwidth system is formed by aggregating a plurality of component carriers, uplink/downlink time division of each component carrier multiplexes a same frequency resource; the system and a terminal transmit data on the component carriers; radio frames of a plurality of component carriers have the same length, and sub-frames contained by each radio frame have the same length. The data transmission method for the hybrid time division duplex large-bandwidth system can be backwards compatible and support asymmetrical service.

Description

A kind of data transmission method for mixed time division duplex large band width system

Technical field

The present invention relates to the communications field, in particular to a kind of data transmission method for mixed time division duplex large band width system.

Background technology

Fig. 1 shows the frame structure of LTE (Long Term Evolution, Long Term Evolution) system TDD (Time DivisionDuplex, time division duplex) pattern.In the frame structure of tdd mode, the radioframe of a 10ms (radio frames) is long for the half frame (field) of 5ms forms by two, and field comprises 5 and longly is the subframe of 1ms (subframe).Subframe i is defined as 2 and longly is time slot 2i and the 2i+1 of 0.5ms.For Normal CP (Normal Cyclic Prefix, standard cyclic prefix), the symbol that it is 66.7us that time slot comprises 7 length, wherein the CP length of first symbol is 5.21us, the CP of all the other 6 symbols (Cyclic Prefix) length is 4.69us; For Extended (Extended, expansion) CP, a time slot comprises 6 symbols, and the CP length of all symbols is 16.67us.

In this frame structure, the configuration characteristics of subframe are:

(1) on/and downlink percent configuration (UL/DL ratio configuration): in order to reduce the configured number of up-downgoing ratio, LTE TDD has stipulated the allocation plan of 7 kinds of ascending-descending subframes numbers in a radio frames, sees Table 1.All subframes all are divided into three classes, the one, descending sub frame; The one, special subframe; The one, sub-frame of uplink; Inallocation plan 1,subframe 2,3,7,8 are used for uplink,subframe 0,4,5,9 are used for downlink transfer, andsubframe 1,6 is a special subframe simultaneously.

Table 1LTE TDD up-downgoing proportional arrangement

Wherein, D represents descending sub frame, and U represents sub-frame of uplink, and S represents special subframe.

(2) special subframe comprises 3 special time slots, is respectively DwPTS (Downlink Pilot TimeSlot, descending pilot frequency time slot), GP (Guard Period, protection is at interval) and UpPTS (Uplink PilotTime Slot, uplink pilot time slot), wherein:

1. DwPTS is used for downlink transfer, minimumly comprises three symbols, and the 3rd symbol is used to transmit P-SCH (Primary-Synchronization, synchronously main) signal;

2. GP does not transmit any data for the protection interval;

3. UpPTS is used for uplink, can be used to transmit signals such as RACH (Random Access Channel, Random Access Channel), sounding (detection) pilot tone;

(3) the previous subframe of special subframe is fixed for downlink transfer; A back subframe of special subframe is fixed for uplink.

LTE Release-8 has defined 6 kinds of bandwidth: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and has known 20MHz;

LTE-Advanced (Further Advancements for E-UTRA) is the evolution version of LTE Release-8.Except that satisfying or surpassing 3GPP TR 25.913: all related needs of " Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN) ", also will meet or exceed the demand of the IMT-Advanced of ITU-R proposition.Wherein, the demand with LTE Release-8 backward compatibility is meant: the terminal of LTE Release-8 can be worked in the network of LTE-Advanced; The terminal of LTE-Advanced can be worked in the network of LTE Release-8.

In addition, LTE-Advanced should be able to satisfy more flexible bigger frequency spectrum configuration, is supported in the wideer frequency spectrum configuration (as 50Mhz, the system spectral resources of 100MHz) of LTERelease-8 work down, to reach higher performance and target peak speed.Because the LTE-Advanced network needs to insert LTE user, so its operational frequency bands need cover present LTE frequency band, has not had the spectral bandwidth of assignable continuous 100MHz on this frequency range.So in order to support the bigger system bandwidth of 20Mhz, the direct technology that LTE-Advanced need solve is that several composition carrier frequency resource (the Component frequency resource) polymerizations that are distributed on the different frequency range are got up to form the operable big system bandwidth resource of LTE-Advanced, the carrier frequency difference of every composition carrier frequency resource (centre frequency difference), the amount of bandwidth of every composition carrier frequency resource can be different, every composition carrier frequency resource comprises a continuous sub-carriers group, be that every composition carrier frequency resource is a continuous frequency spectrum resource, system bandwidth as 100Mhz can be polymerized by the composition carrier frequency resource that 5 bandwidth are 20Mhz, and the composition carrier frequency resource that also can be added two 20Mhz by the composition carrier frequency resource of a 60Mhz is polymerized.Just, the big system bandwidth of LTE-Advanced demand can be polymerized by n piece composition carrier frequency resource, the carrier frequency difference of every composition carrier frequency resource, the big system bandwidth that is polymerization comprises n one-tenth sub-carrier (Component carrier), and the amount of bandwidth of the composition carrier frequency resource of each composition carriers carry can be different.

The scheme of frequency spectrum configuration mainly contains 3 kinds, as shown in Figure 2.Wherein, the one-tenth sub-carrier of grid part is and the system bandwidth of LTE Release-8 compatibility that the one-tenth sub-carrier of oblique line part is the proprietary system bandwidth of LTE-Advanced.Fig. 2 a is a frequencyspectrum allocation plan 1, be meant that the LTE-Advanced frequency spectrum disposes the system bandwidth that is defined by 1 LTE-Advanced and forms, and this bandwidth is greater than the system bandwidth of LTE Release-8 definition.Fig. 2 b is a frequencyspectrum allocation plan 2, is meant that the LTE-Advanced frequency spectrum disposes the system component carrier wave that is defined by a LTERelease-8 and forms by spectrum aggregating (carrier aggregation) with the sub-carrier that becomes of a plurality of LTE-Advanced definition.Fig. 2 c is a frequencyspectrum allocation plan 3, be meant that the LTE-Advanced frequency spectrum disposes the system component carrier wave that is defined by a plurality of LTE Release-8 and forms by spectrum aggregating (carrieraggregation), wherein, the gathering of above-mentioned frequency spectrum can be the polymerization of continuous frequency spectrum, also can be the polymerization of discontinuous spectrum.LTE Release-8 terminal can insert the frequency band of compatible LTE Release-8, and the LTE-A terminal can either insert the frequency band of LTE Release-8 compatibility, also can insert the frequency band of LTE-Advanced.

Consider and the compatibility of LTE Release-8 that LTE-Advanced respectively becomes sub-carrier to need to satisfy can insert LTE user; In addition, be subjected to hardware device restriction, at present and in the coming years, up emission surpasses the 40MHz bandwidth signal will consume a large amount of power, be unfavorable for terminal power saving; The downlink business flow will significantly increase in the wireless network simultaneously, causes terminal up-downgoing business asymmetric; And for a plurality of composition carrier aggregation of discontinuous frequency spectrum, each composition spectrum of carrier characteristic is may difference very big.The LTE-Advanced system need satisfy above-mentioned to time delay, and high-throughput/spectral efficient is supported the non-symmetrical service type, requirements such as backward compatibility.

Summary of the invention

The technical problem to be solved in the present invention is to satisfy the requirement that the TDD system supports the non-symmetrical service type flexibly, proposes a kind of data transmission method for mixed time division duplex large band width system.

In order to solve the problems of the technologies described above, the invention provides a kind of data transmission method for mixed time division duplex large band width system, its frequency spectrum resource of described time division duplex large band width system is formed by several composition carrier aggregation, each becomes on the sub-carrier, on/the multiplexing identical frequency resource of downlink time division, described system and terminal become the sub-carrier transmitting data described, and described several become the radio frames length of sub-carriers identical, and the subframe lengths that each radio frames comprises is identical.

Further, said method also can have following characteristics, and the described symbol lengths that several become its subframe of sub-carrier to comprise is identical.

Further, said method also can have following characteristics, and described radio frames is 10ms, comprises 10 subframes, and each subframe is 1ms, and each subframe comprises 2 and longly is the time slot of 0.5ms.

Further, said method also can have following characteristics, and described several become the up-downgoing proportional arrangement of sub-carrier identical or different.

Further, said method also can have following characteristics, and described several become sub-carrier to have two up-downgoing proportional arrangement differences that become sub-carrier at least.

Further, said method also can have following characteristics, and described system respectively becomes up-downgoing proportional arrangement on the sub-carrier by broadcast message notice terminal.

Further, said method also can have following characteristics, and the ascending resource that described system assignment is given terminal becomes sub-carrier identical or different with downlink resource comprises.

Further, said method also can have following characteristics, and described system adopts the terminal specific control mode to dispose the sub-carrier that becomes of the one-tenth sub-carrier of descending reception of each terminal and up transmission.

Further, said method also can have following characteristics, and described several become to have at least on the sub-carrier two to become the protection that is used for the up-downgoing conversion on the sub-carrier different at interval.

Data transmission method for mixed time division duplex large band width system of the present invention, the up-downgoing carrier number of distributing to terminal can be different with type, thereby support non-symmetrical service, and each composition carrier frame structure is identical, can guarantee the compatibility of LTE-Advanced system and LTE Release-8 system, make the LTE-Advanced terminal obtain big frequency selectivity gain, high dispatching flexibility, improve throughput, reduce time delay real time scheduling of traffic.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:

Fig. 1 shows the schematic diagram of the frame structure of LTE system TDD mode;

Fig. 2 is 3 kinds of frequency spectrum allocation plan schematic diagrames of LTE-Advanced system;

Fig. 3 shows the embodiment of a kind of mixed time division duplex large band width system.

Embodiment

LTE-Advanced respectively becomes sub-carrier to need to satisfy can insert LTE user, and this need guarantee to become the physical layer architecture of sub-carrier to keep consistent with LTE at each as far as possible.Be to support non-symmetrical service, thus the very possible back-up system of LTE-Advanced distribute to terminal on/composition carrier number difference that downlink resource comprised.In addition, especially for a plurality of composition carrier aggregation of discontinuous frequency spectrum, each composition spectrum of carrier characteristic possibility difference is very big, compare with the LTE base station dispatcher, the LTE-Advanced scheduler should be given the user with the good channel of heterogeneity carrier wave intermediate frequency spectrum characteristic as far as possible, and this mechanism need be supported in LTE-Advanced.

Consider that the LTE-Advanced system is to time delay, high-throughput/spectral efficient, support requirements such as non-symmetrical service type, the present invention proposes a kind of suitable LTE-Advanced TDD system data transmission method, the frequency resource of a plurality of one-tenth sub-carriers (component carrier) aggregates into the frequency resource of this time division duplex large band width system, each becomes on the sub-carrier, on/the multiplexing identical frequency resource of downlink time division, system is becoming the sub-carrier transmitting data with terminal.

Wherein, each becomes the parameter (numerology) of the frame structure of system wireless frame on the sub-carrier identical, each becomes the radio frames length of system on the sub-carrier, number of sub-frames, subframe lengths that each radio frames comprises are identical, further, each becomes the symbol numbers, the symbol lengths that comprise in the subframe of sub-carrier identical.This system wireless frame structure can use the wireless frame structure of existing LTE TDD system.

Each becomes on the sub-carrier, on/downlink percent configuration (UL/DL ratio configuration) can be identical or different; At least exist in these a plurality of one-tenth sub-carriers on two kinds/the downlink percent configuration, promptly have at least in this a plurality of one-tenth sub-carriers two become sub-carriers on/downlink percent configuration difference.

System can notify terminal respectively to become up-downgoing proportional arrangement on the sub-carrier by broadcast message.

The one-tenth sub-carrier that the composition carrier number that ascending resource comprised that system assignment is given terminal and downlink resource are comprised can be different (composition carrier number and concrete which uses become the sub-carrier all can difference), and/or system assignment can be positioned at different becoming on the sub-carrier to the ascending resource of terminal with downlink resource.Further, system adopts the control mode of terminal specific (UE-Specific) to dispose the sub-carrier that becomes of the one-tenth sub-carrier of descending reception of each terminal and up transmission, i.e. which becomes sub-carrier in the number that becomes sub-carrier of the one-tenth sub-carrier that receives of configurating downlink and up transmission and concrete use.Be that specific configuration can be carried out to terminal at certain terminal in the base station.

Each becomes on the sub-carrier, and (Guard Period GP) can be identical or different at interval respectively to become to be used on the sub-carrier protection of downstream-to-upstream conversion (DLto UL switching) under the TDD duplex mode.Further, have at least two to become the protection that is used for the up-downgoing conversion on the sub-carrier different at interval.

Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.

Embodiment one:

Be compatible LTE terminal, the design that the frame structure of the radio frames of mixed time division duplex large band width of the present invention system can be continued to use LTE, and the up-downgoing proportional arrangement among the up-downgoing proportional arrangement backward compatibility LTE but be not limited to up-downgoing proportional arrangement in the LTE system.Concrete frame structure as shown in Figure 1, the up-downgoing proportional arrangement is as shown in table 1.

Fig. 3 has provided a kind of schematic diagram that adopts mixed time division duplex large band width of the present invention system, wherein each becomes sub-carrier to dispose different up-downgoing ratios, this system's polymerization three one-tenth sub-carrier discrete on the frequency band (but the invention is not restricted to one-tenth sub-carrier discrete on the polymerization frequency band, also can the polymerization frequency band on continuous one-tenth sub-carrier).Wherein becomesub-carrier 1 to use the DL/ULproportional arrangement 0 of LTE TDD system definition; Becomesub-carrier 2 to use the DL/UL proportional arrangement 5 of LTE TDD system definition, becomesub-carrier 3 to use the DL/ULproportional arrangement 1 of LTE TDD system definition.Become on thesub-carrier 1 and disposed more sub-frame of uplink, can support bigger uplink throughput, become on thesub-carrier 2 to have disposed more descending sub frame, can satisfy the demand of high downlink throughput capacity, become the up-downgoing ratio relative equilibrium of configuration on thesub-carrier 3, can satisfy symmetrical service preferably.

Based on mixed time division duplex large band width system shown in Figure 3, the base station is according to terminal capability, but flexible allocation resources such as data volume and professional Qos requirement are given terminal, for example:

When the base station has more data volume to send to terminal, can become the subcarrier in the sub-carrier to dispatch with three to terminal in the 5th subframe (the being subframe 6) base station of each radio frames; The 5th subframe only is example herein, also can dispatch other subframes.

When the terminal number load of having only less data volume or base station to insert when the base station is big, only become in the sub-carrier the more excellent subcarrier of channel condition to dispatch to terminal with one in the 5th subframe base station of each radio frames;

The base station has sent a packet to terminal in thesubframe 0 of certain radio frames in one-tenth sub-carrier 2, the HARQ-ACK of this packet (Hybird Automatic ReQuest mixes automatic repeat requests and confirms feedback information) can send in one-tenth sub-carrier 1 subframe 4 (this subframe is a sub-frame of uplink) of this wireless frame period.Be that terminal can become to receive packet on the sub-carrier at certain, in another affirmation information that becomes these data of feedback on the sub-carrier, support HARQ (mixing automatic repeat requests) feedback system flexibly, thereby improve feedback efficiency.

The base station is becoming the downlink resource that has distributed terminal on thesub-carrier 1 and 2, and is only becoming the ascending resource that has distributed this terminal on the sub-carrier 2.Be that the sub-carrier that becomes that up transmission of terminal and descending reception are used can the type difference, the quantity difference.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1, a kind of data transmission method for mixed time division duplex large band width system, its frequency spectrum resource of described time division duplex large band width system is formed by several composition carrier aggregation, each becomes on the sub-carrier, on/the multiplexing identical frequency resource of downlink time division, described system and terminal become the sub-carrier transmitting data described, it is characterized in that described several become the radio frames length of sub-carrier identical, the subframe lengths that each radio frames comprises is identical.

2, the method for claim 1 is characterized in that, the described symbol lengths that several become its subframe of sub-carrier to comprise is identical.

3, method as claimed in claim 1 or 2 is characterized in that, described radio frames is 10ms, comprises 10 subframes, and each subframe is 1ms, and each subframe comprises 2 and longly is the time slot of 0.5ms.

4, the method for claim 1 is characterized in that, described several become the up-downgoing proportional arrangement of sub-carrier identical or different.

5, method as claimed in claim 4 is characterized in that, described several become sub-carrier to have two up-downgoing proportional arrangement differences that become sub-carrier at least.

As claim 4 or 5 described methods, it is characterized in that 6, described system respectively becomes up-downgoing proportional arrangement on the sub-carrier by broadcast message notice terminal.

7, the method for claim 1 is characterized in that, the ascending resource that described system assignment is given terminal becomes sub-carrier identical or different with downlink resource comprises.

8, method as claimed in claim 7 is characterized in that, described system adopts the terminal specific control mode to dispose the sub-carrier that becomes of the one-tenth sub-carrier of descending reception of each terminal and up transmission.

9, method as claimed in claim 1 or 2 is characterized in that, described several become to have at least on the sub-carrier two to become the protection that is used for the up-downgoing conversion on the sub-carrier different at interval.

Images