CN101237675B - Method for base station to transmit feedback signals to the terminal in time division duplex system - Google Patents
Method for base station to transmit feedback signals to the terminal in time division duplex system Download PDFInfo
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Abstract
A downlink signal transmission method used in a time division duplex system comprises the following processing: a transmitting device of the time division duplex system selects a downlink transmitting frequency spectrum used for downlink transmission; a base station selects part frequency spectrum from the downlink transmitting frequency spectrum to send a feedback signal used in the uplink in a two-way frequency spectrum to a terminal; moreover, the terminal acquires relevant information of the part frequency spectrum in the downlink transmitting frequency spectrum used to send the feedback signal to the terminal, and receives the feedback signal according to relevant information. The downlink signal transmission method can reduce the hardware complexity of the prior TDD system in supporting broadcast service and also provides a feedback path for the uplink of the TDD system at the same time, thereby improving the uplink throughput and the support capability on a high speed mobile terminal of the TDD system.
Description
Technical field
The present invention relates to the communications field, and more particularly, relate to a kind of base station sends method from feedback signal to terminal, it is particularly useful for using TDD (TimeDivision Duplex, the time division duplex) system of two kinds of frequency spectrums.
Background technology
At third generation partner program (the 3rd GenerationPartnership Project of 3G technology standard mechanism, in the technical report 25.913 that 3GPP) provides " access of the wireless universal of evolution (Universal Telecommunication Radio Access; UTRA) and the demand of the wireless universal Access Network of evolution (Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN) " the 8.2nd joint following principle has been determined in the flexibility that frequency spectrum uses: system should be supported in the content that provides identical or different on one group of resource collection and send, this group resource collection comprises: be in radio bands resource (the Radio Band Resources on identical and the different frequency range, RBR), power, adaptive schedulings etc. also comprise up, the arrangement of the adjacent and non-adjacent channel of down link.System depends on terminal and network complexity and cost to the degree of support of one group of resource collection of Integrated using, and wherein, RBR refers to obtainable all frequency spectrums of operator.
As shown in Figure 1, existing TDD system uses non-paired two-way frequency spectrum 101, carries out the uplink and downlink two-way communication in the mode of time-division.F1～f2 among the figure is the spectrum width (being referred to as two-way frequency spectrum here) that the TDD system bidirectional uses, in non-paired frequency spectrum 101, and the work that all hockets take radio frames as the cycle of the public broadcasting signal of system, control signal, service signal.The base band of TDD system and channel resource are to support the mode of uplink and downlink to design on each frequency.
The cycle T 0 of radio frames is generally 10ms or 5ms, and can further be subdivided into uplink and downlink two class time slots the cycle T 0 of radio frames is interior, ascending time slot comprises synchronization slot and business time-slot, and descending time slot further comprises time slot except comprising synchronization slot and business time-slot.Each time slot only occurs once in 10ms, and within such time, the TDD system can use a plurality of frequencies or frequency range synchronously to carry out the uplink and downlink transmission simultaneously.
The TDD system supports the basic skills of multimedia broadcast multi-broadcasting business (MBMS) to be, utilize the descending time slot in the frame structure of TDD system (for example to send broadcast singal, utilize the descending time slot parallel transmission broadcasting service in a plurality of carrier waves in the TDD system), to realize the maximization of downstream rate.
Submit in the technology motion of 3GPP in Ericsson, motion number is R1-062268, a kind of MBMS method that provides in the motion of motion title " Dedicated MBMS Carrier Using CommonTransmitted Waveforms (using the special-purpose MBMS carrier wave of common issue waveform) " is: in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, specify special-purpose MBMS carrier wave that a plurality of MBMS physical channels are provided, such as, auxiliary publish control physical channel (Secondary Common Control PhysicalChannels is provided, S-CCPCH), what the difference of itself and traditional WCDMA physical channel was to use on the MBMS special carrier is public scrambler, rather than for the special-purpose scrambler (cell-specific scrambling codes) of concrete residential quarter.Identical channel code is used in different base stations, and the synchronous code chip level is realized in different base stations.This method can improve by diversity gain the MBMS spectrum efficiency of WCDMA system.
There has been at present manufacturer to release double-mode and double-standby terminal, domestic several enterprises have all developed the double model double standby phone that is applicable to TD SDMA/global system for mobile communications (TD-SCDMA/GSM), no matter this mobile phone is under standby mode or under the talking state, can realize two seamless switching and roamings between the network, it occurs undoubtedly for using neatly TDD and FDD frequency spectrum to open up the space.
Yet, also have following shortcoming in correlation technique: the cycle T 0 of (1) radio frames has limited the feedback frequency of system's closed loop work, for example, power control instruction issue the restriction that all will be subjected to wireless frame period T0 with dispatching cycle, this had both limited throughput of system, also restriction system for the further raising of the tenability of high speed mobile terminal; (2) base band of the system of existing TDD and channel resource are to design according to the mode of supporting uplink and downlink on each frequency, yet, most resources that broadcasting service takies are downlink resources, when the existing up-downgoing resource distribution that designs in the two-way communication mode is used for broadcasting, can cause being configured in the waste that the uplink baseband of broadcasting on the frequency is processed resource and up radio-frequency channel resource; (3) existing dual-mode handset technology has just realized two kinds of independently standards (being two standards of GSM and TD-SCDMA), and it only can coexist in same terminal, does not but realize the collaborative and fusion of the profound level of two standards.
Although Ericsson (R1-062268) has proposed " using the special-purpose MBMS carrier wave of common issue waveform " for the FDD system, can cause the downlink broadcast signal to the uplink interference of TDD system if directly be applied to the TDD system.
At present, also there are not to propose to take into account simultaneously the throughput of TDD system and TDD system to the technical scheme of these two factors of tenability of portable terminal.
Summary of the invention
Consider the defective in the correlation technique and make the present invention, the object of the present invention is to provide a kind of transmission mechanism that sends feedback signal for the base station of tdd systems to terminal.
According to the embodiment of the invention, provide a kind of transmission method that sends feedback signal for the base station of tdd systems to terminal.
The method comprises following processing: the emitter of tdd systems is chosen the downlink frequency spectrum for downlink; The base station selects partial frequency spectrum to be used for sending to terminal the feedback signal of the up link that is used for two-way frequency spectrum in the downlink frequency spectrum; And terminal obtains in the downlink frequency spectrum and to be used for the base station sends relevant information from the feedback signal partial frequency spectrum to terminal, and according to the relevant information receiving feedback signals.
Wherein, emitter is chosen the downlink frequency spectrum in the tdd systems licensed band.Particularly, can in the time division duplex licensed band of closing on the frequency division duplex system band downlink, select the downlink frequency spectrum, perhaps and in the time division duplex licensed band of closing on satellite band select the downlink frequency spectrum.
In addition, emitter can to selecting the downlink frequency spectrum the frequency spectrum of frequency division duplex system license, perhaps be selected the downlink frequency spectrum in the idle frequency spectrum of received terrestrial digital broadcasting frequency range.
Further, select the method for partial frequency spectrum to be: feedback signal and the same frequency band of broadcasting service Signal share and use same carrier wave.
In addition, the method for sharing same frequency band comprises following a kind of at least: OFDM, time division multiplexing, code division multiplexing.
Above-mentioned feedback signal comprises one of following information at least: transmitting power control information, dynamic scheduling information, automatic retransmission of information, channel quality information and self-adapting modulation coding information.
In addition, be used for the base station and comprise at least one of following information to the relevant information that terminal sends the feedback signal partial frequency spectrum: frequency positional information, frame synchronization position information, code modulation mode information.Wherein, terminal reads relevant information in two-way frequency spectrum, or reads relevant information from predefined parameter.
In addition, above-mentioned tdd systems comprises: at least one base station, and it is except using according to time division way two-way frequency spectrum receives and dispatches, and also carries out downlink for the feedback signal of the up link of two-way frequency spectrum at another unidirectional frequency spectrum; And at least one terminal, be connected to above-mentioned at least one base station, terminal is except using two-way frequency spectrum to realize the transmitting-receiving according to time division way, also receive the feedback signal that the base station sends at another unidirectional frequency spectrum, wherein, feedback signal comprises at least a in the following signal: the confirmation of receipt signal that the adaptive coding and modulating control signal of terminal, the power control signal to terminal, the channel information that sends to terminal and base station is sent to terminal.
Wherein, feedback signal and the same frequency band of broadcasting service Signal share and use same carrier wave.And the method for sharing same frequency band comprises following a kind of at least: OFDM, time division multiplexing and code division multiplexing.
By technique scheme of the present invention, can reduce the existing TDD system at the hardware complexity of supporting on the broadcasting service, up link for the TDD system provides feedback path simultaneously, thereby has improved the uplink throughput of TDD system and to the tenability of high speed mobile terminal.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the frequency spectrum use method of TDD system in the correlation technique;
Fig. 2 is the flow chart that sends the feedback signal method according to the base station that is used for tdd systems of the embodiment of the invention to terminal;
Fig. 3 is the schematic diagram according to the combination of two-way frequency spectrum and downlink broadcast frequency spectrum in the TDD system of the embodiment of the invention;
Fig. 4 is the schematic diagram in conjunction with the spectrum structure of the embodiment of the invention employing of the 3G frequency spectrum of China's division;
Fig. 5 is the schematic diagram according to the radio frames of symmetrical arrangements in the spectrum structure of the embodiment of the invention; And
Fig. 6 is the schematic diagram according to the radio frames of balanced configuration in the spectrum structure of the embodiment of the invention.
Embodiment
Describe below with reference to accompanying drawings embodiments of the invention in detail.
According to embodiments of the invention, provide a kind of downstream signal transmission method for time division duplex (TDD) system.
At first, the method that provides of the embodiment of the invention is applicable to the TDD system that is made of at least one base station and at least one terminal.In this TDD system, the base station can also be in the downlink of other one section unidirectional frequency spectrum realization for the feedback signal of the up link of two-way frequency spectrum except using one section two-way frequency spectrum to realize the transmitting-receiving according to time division way; And terminal is except using one section two-way frequency spectrum to realize the transmitting-receiving according to time division way, can also receive the employed feedback signal of its up link at other one section unidirectional frequency spectrum, wherein, terminal is to carry out in the mode of time-division in the transmitting-receiving on one section two-way frequency spectrum and the reception on the unidirectional frequency spectrum of another section.In addition, the reception of terminal on unidirectional frequency spectrum comprises to the reception of downlink feedback information or to the reception of broadcasting service signal.
Wherein, feedback signal and the same frequency band of broadcasting service Signal share and use same carrier wave.And the method for sharing same frequency band comprises following a kind of at least: OFDM, time division multiplexing and code division multiplexing.
As shown in Figure 2, the downstream signal transmission method that is used for tdd systems according to the embodiment of the invention may further comprise the steps: step S202, the emitter of tdd systems choose the downlink frequency spectrum for downlink; Step S204, the base station selects partial frequency spectrum to be used for sending to terminal the feedback signal of the up link that is used for two-way frequency spectrum in the downlink frequency spectrum; And step S206, terminal is obtained and is used for the base station sends relevant information from the partial frequency spectrum of feedback signal to terminal in the downlink frequency spectrum, and according to the relevant information receiving feedback signals.
Wherein, feedback signal comprises one of following information at least: transmitting power control information, dynamic scheduling information, automatic retransmission of information, channel quality information, self-adapting modulation coding information.
According to the structure of the frequency spectrum of the present embodiment as shown in Figure 3.As can be seen from Figure 3, the spectrum structure that is used for improving TDD system uplink ability the present invention provides except using non-paired two-way frequency spectrum 101, has further increased the frequency spectrum 201 that is specifically designed to downlink, wherein, the frequency spectrum 201 of downlink is that license is to the frequency spectrum of TDD system.Fig. 4 shows the 3G frequency range 202 that China divides, wherein, and TDD frequency spectrum 203,204,206, the 207th, the part of two-way frequency spectrum 101.
Alternatively, emitter selected part frequency spectrum in the tdd systems licensed band, perhaps in the time division duplex licensed band of closing on the frequency division duplex system band downlink, select partial frequency spectrum, perhaps in the time division duplex licensed band of closing on satellite band, select partial frequency spectrum.
In addition, when selecting frequency spectrum, emitter need to be selected the downlink frequency spectrum from the frequency spectrum that frequency division duplex system is permitted, perhaps emitter is selected partial frequency spectrum in the idle frequency spectrum of received terrestrial digital broadcasting frequency range.
That is to say, with reference to Fig. 3 and Fig. 4, a kind of method of choosing the downlink frequency spectrum is: will be close to part or all frequency spectrum 201a in the TDD frequency spectrum 206 of downstream spectrum (FDD-DL) 205 of Frequency Division Duplexing (FDD) frequency spectrum as the frequency spectrum 201 of downlink, frequency spectrum 201a can be used for the emission of broadcasting service, and also can be used for simultaneously provides feedback path for TDD frequency spectrum 203,204 and 207 up emission.Another kind of optional method is: close on a part of frequency spectrum 201b of satellite band as the frequency spectrum 201 of downlink in 207.
In addition, aspect the division of frequency spectrum, with reference to Fig. 3 and Fig. 4, the frequency spectrum of TDD system except comprise that International Telecommunication Association divides 203,204, also comprise the frequency spectrum 206,207 that Chinese Government marks off, the characteristics of this spectrum division mode are: the FDD downstream spectrum 205 that the TDD frequency spectrum 206 next-door neighbour Chinese Government that Chinese Government divides divide, a TDD system realizes descending multimedia broadcasting frequency spectrum 201, width value in 0～40MHz scope of the private downlink frequency spectrum 201a of this TDD system with the partial frequency spectrum 201a near 205.
Alternatively, with reference to Fig. 3 and spectrum division mode shown in Figure 4, the frequency spectrum of TDD system except comprise that International Telecommunication Association divides 203,204, also comprise the frequency spectrum 206,207 that Chinese Government marks off, the characteristics of this spectrum division mode are: 205, one TDD systems of FDD downstream spectrum that the TDD frequency spectrum 206 next-door neighbour Chinese Government that Chinese Government divides divide realize descending multimedia broadcasting frequency spectrum 201 with one section frequency spectrum 201b near 2300MHz; Private downlink frequency spectrum 201 both can be used for the broadcasting of multi-medium data, and also can be used for provides feedback path for the uplink on the part or all of frequency spectrum in the TDD frequency spectrum 203,204,206 and 207.
Alternatively, a TDD system uses and is positioned at the ground TV broadcast frequency spectrum, comprise VHF:174MHz～230MHz, UHF:470MHz～798MHz, in a part as private downlink frequency spectrum 201, this private downlink frequency spectrum 201 both can be used for the broadcasting of multi-medium data, and also can be used for provides feedback path for the uplink on the some or all of frequency spectrum in the TDD frequency spectrum 203,204,206 and 207.
In addition, the relevant information in the method comprises one of following information at least: frequency positional information, frame synchronization position information, code modulation mode information.Wherein, terminal reads relevant information in two-way frequency spectrum, or reads relevant information from predefined parameter.
In addition, with reference to Fig. 5 and Fig. 6, radio frames 301 on the two-way frequency spectrum 101 is comprised of several ascending time slots 302 and several descending time slots 303, preferably, ascending time slot is TS1～TS4, descending time slot is TS5～TS8, and the ascending time slot 301 in the radio frames and the number of descending time slot 302 are variable.In the TDD of practical application system, for the consideration of system, the radio frames of different system can adopt different radio frames length and different timeslot numbers.Preferably, the time width of TS5～TS8 be 0.5ms to 1ms, radio frames 301 is generally got 5ms or 10ms, a radio frames comprises 5～20 time slots.
The radio frames 305 that is specifically designed to the frequency spectrum 201 of downlink is comprised of set of time-slot 304, this the group time slot can with radio frames 301 in time slot 302 can have identical width, also can have different width, shown in Fig. 5 and Fig. 6 is time slot 302 corresponding three time slots 304 (being labeled as 1,2 and 3) in the radio frames 301, these time slots 304 both can be used for can be used for again issuing broadcast message for up link provides feedback path.When time slot 304 is identical with time slot 302 width in the radio frames 301, use near the information symbol that is in time slot 302 centre positions, such as the OFDM symbol as feedback information.At this moment, in order to shorten feedback delay, the transmission of feedback information is adopted the non-coding mode or adopted the Transmission Time Interval (TTI) less than time slot 302 to transmit.
Here, comprise two class time slots by the downstream feedback frame of frequency spectrum 201 carrying that is specifically designed to downlink: a class is the time slot with ascending time slot 302 correspondences, and another kind of is time slot with ascending time slot 302 correspondences.This two classes time slot can adopt identical time slot width, also can adopt different time slot widths.Preferably, the time width of time slot 304 is that 0.125ms is to 0.5ms.
Radio frames by frequency spectrum 201 carryings that are specifically designed to downlink can adopt symmetrical arrangements shown in Figure 5 in frequency domain, namely, the frequency that transmits the feedback information use is in a side of frequency spectrum 201, and is used for realizing that the frequency of multimedia broadcasting is in the opposite side of frequency spectrum 201.Alternatively, radio frames by frequency spectrum 201 carryings that are specifically designed to downlink also can be balanced configuration shown in Figure 6 at frequency domain, that is, the frequency that transmits the feedback information use is in the center of frequency spectrum 201, and distributing on its bilateral symmetry ground is used for realizing the frequency of multimedia broadcasting.In addition, the width that is specifically designed to the frequency spectrum 201 of downlink can be certain value among 1.25MHz, 2.5MHz, 5MHz, 10MHz and the 20MHz, preferably, transmits the band width of feedback information use and gets steady state value 1.25MHz.
Wherein, alternatively, the transmission feedback information can use the independent carrier frequency in the frequency spectrum 201, also can use the OFDM parton carrier wave in the frequency spectrum 201.
Alternatively, in the process of transmitting of broadcast singal and feedback signal, in the multimedia broadcasting frequency spectrum, the base station can and the base station around it between send broadcast singal in the single frequency network mode of time synchronized, bit synchronous, Frequency Synchronization, frame synchronization.
Here, frame synchronization refer to the TDD system in downlink frequency spectrum 201 radio frames and between the radio frames of two-way frequency spectrum 101 interior transmissions, keep synchronously.Feedback information is distinguished the different user that is in the same residential quarter in the mode that frequency division or code divide.
Preferably, the reception of broadcast singal and feedback signal can may further comprise the steps: first step, terminal is obtained the relevant information of downlink frequency spectrum 201, and this relevant information comprises a kind of of following information at least: frequency position, frame synchronization position, code modulation mode.Terminal can read these information in two-way frequency spectrum 101, also can be to read from predefined parameter, as reading from SIM card; And second step, terminal is carried out the reception of feedback information and/or broadcast message according to frequency, the frame synchronization position of downlink frequency spectrum 201.
In sum, the present invention can reduce the existing TDD system at the hardware complexity of supporting on the broadcasting service, and the up link for the TDD system provides feedback path simultaneously, thereby improves the uplink throughput of TDD system and to the tenability of high speed mobile terminal.
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 modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a downstream signal transmission method is used for tdd systems, it is characterized in that, comprises following processing:
The emitter of tdd systems is chosen the downlink frequency spectrum for downlink;
The base station selects partial frequency spectrum to be used for sending to terminal the feedback signal of the up link that is used for two-way frequency spectrum in described downlink frequency spectrum; And
Terminal is obtained the relevant information that is used for sending to described terminal the described partial frequency spectrum of described feedback signal in the described downlink frequency spectrum, and receives described feedback signal according to described relevant information.
2. method according to claim 1 is characterized in that, described emitter is chosen described downlink frequency spectrum in the tdd systems licensed band.
3. method according to claim 2, it is characterized in that, in the time division duplex licensed band of closing on the frequency division duplex system band downlink, select described downlink frequency spectrum, perhaps in the time division duplex licensed band of closing on satellite band, select described downlink frequency spectrum.
4. method according to claim 1 is characterized in that, described emitter is selected described downlink frequency spectrum from the frequency spectrum that frequency division duplex system is permitted.
5. method according to claim 1 is characterized in that, described emitter is selected described downlink frequency spectrum in the idle frequency spectrum of received terrestrial digital broadcasting frequency range.
6. method according to claim 1 is characterized in that, described feedback signal comprises one of following information at least: transmitting power control information, dynamic scheduling information, automatic retransmission of information, channel quality information, self-adapting modulation coding information.
7. method according to claim 1 is characterized in that, described relevant information comprises one of following information at least: frequency positional information, frame synchronization position information, code modulation mode information.
8. method according to claim 7 is characterized in that, described terminal reads described relevant information in two-way frequency spectrum, or reads described relevant information from predefined parameter.
9. each described method in 8 according to claim 1 is characterized in that, described tdd systems comprises:
At least one base station, it is except using according to time division way two-way frequency spectrum receives and dispatches, and also carries out downlink for the feedback signal of the up link of two-way frequency spectrum at another unidirectional frequency spectrum; And
At least one terminal is connected to described at least one base station, and described terminal is except using two-way frequency spectrum to realize the transmitting-receiving according to time division way, also receiving feedback signals on another unidirectional frequency spectrum.
10. method according to claim 9 is characterized in that, described base station is in emission during described feedback signal, described feedback signal and the same frequency band of broadcasting service Signal share and use same carrier wave.
11. method according to claim 10 is characterized in that, the described method of sharing a frequency band comprise following one of at least: OFDM, time division multiplexing, code division multiplexing.
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| CN 200710003289 CN101237675B (en) | 2007-02-02 | 2007-02-02 | Method for base station to transmit feedback signals to the terminal in time division duplex system |
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| CN103220723B (en) | 2012-01-18 | 2016-08-10 | 华为技术有限公司 | Wireless communications method and device |
| CN103856907B (en) * | 2012-11-30 | 2018-05-15 | 中国移动通信集团公司 | Long Term Evolution multimedia broadcast multicast service transmission method and base station |
| CN109429340B (en) * | 2017-08-25 | 2023-05-05 | 阿里巴巴集团控股有限公司 | Wireless communication method and device |
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| CN1605220A (en) * | 2001-12-07 | 2005-04-06 | 艾利森电话股份有限公司 | Mobile terminal for optimal spectrum utilization in cellular systems |
| CN1748377A (en) * | 2003-02-11 | 2006-03-15 | Ip无线有限公司 | Method, base station and mobile station for tdd operation in a communication system |
| CN1753564A (en) * | 2004-09-22 | 2006-03-29 | 株式会社Ntt都科摩 | Mobile communication system,frequency band allocation device and method |
| CN1816993A (en) * | 2003-07-03 | 2006-08-09 | 松下电器产业株式会社 | Multi-carrier communication device and feedback information communication method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605220A (en) * | 2001-12-07 | 2005-04-06 | 艾利森电话股份有限公司 | Mobile terminal for optimal spectrum utilization in cellular systems |
| CN1748377A (en) * | 2003-02-11 | 2006-03-15 | Ip无线有限公司 | Method, base station and mobile station for tdd operation in a communication system |
| CN1816993A (en) * | 2003-07-03 | 2006-08-09 | 松下电器产业株式会社 | Multi-carrier communication device and feedback information communication method |
| CN1753564A (en) * | 2004-09-22 | 2006-03-29 | 株式会社Ntt都科摩 | Mobile communication system,frequency band allocation device and method |
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