CN104038998A - Method for transmitting control signal using efficient multiplexing - Google Patents

Method for transmitting control signal using efficient multiplexing Download PDF

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Publication number
CN104038998A
CN104038998A CN201410224802.0A CN201410224802A CN104038998A CN 104038998 A CN104038998 A CN 104038998A CN 201410224802 A CN201410224802 A CN 201410224802A CN 104038998 A CN104038998 A CN 104038998A
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China
Prior art keywords
ack
nack
time
nack signal
ofdm symbol
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CN201410224802.0A
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Chinese (zh)
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CN104038998B (en
Inventor
金学成
崔承德
金沂浚
尹硕铉
安俊基
金奉会
徐东延
尹宁佑
李正熏
郑圣勋
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LG Electronics Inc
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LG Electronics Inc
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Priority claimed from CN200780036950.8A external-priority patent/CN101627567B/en
Publication of CN104038998A publication Critical patent/CN104038998A/en
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Publication of CN104038998B publication Critical patent/CN104038998B/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0003—Code application, i.e. aspects relating to how codes are applied to form multiplexed channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
    • H04W52/58—Format of the TPC bits

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

A method of transmitting a control signal using efficient multiplexing is disclosed. The present invention includes the steps of multiplexing a plurality of 1-bit control signals within a prescribed time-frequency domain by code division multiple access (CDMA) and transmitting the multiplexed control signals, wherein a plurality of the 1-bit control signals include a plurality of the 1-bit control signals for a specific transmitting side. Accordingly, reliability on 1-bit control signal transmission can be enhanced.

Description

For carry out the method for transmission of control signals with efficient multiplexing
The application is that the international filing date of submitting on April 2nd, 2009 is that the application number on October 2nd, 2007 is 200780036950.8 (PCT/KR2007/004825), the divisional application that denomination of invention is " for carry out the method for transmission of control signals with efficient multiplexing " patent application.
Technical field
The present invention relates to a kind of method for transmission of control signals in multi-carrier mobile communication system, particularly a kind of transmission method of control signal.Although the scope of application of the present invention is very large, be particularly useful in uplink/downlink transmissions by multiplexing multiple 1 control signal effectively and transmission of control signals reliably.
Background technology
In general,, in multi-carrier mobile communication system, base station is carried out downlink packet and is transferred to each multiple subscriber equipmenies (user equipments, UE) that belong to Yi Ge community or belong to multiple communities.Meanwhile, multiple subscriber equipmenies can exist in Yi Ge community.Owing to using a kind of form of predetermining, each subscriber equipment cannot know how packet will be transferred to oneself, therefore when base-station transmission downlink packet is during to special user equipment, this base station should transfer ratio necessary information as described below: by receiving the subscriber equipment ID of corresponding packet, for carrying the time-frequency domain of this packet, the data transmission format that comprises encoding rate, modulator approach and similar information, HARQ relevant information and being used for transmitting the similar information of each downlink packet at down link.
On the contrary, in order to allow subscriber equipment can transmit packet in up link, transfer ratio necessary information is as described below answered in base station: be allowed to the subscriber equipment that transmits packet ID, allow this subscriber equipment can transmit the up link time-frequency domain of this packet, the data transmission format that comprises encoding rate, modulator approach and similar information, HARQ relevant information and be used for transmitting the similar information of each uplink data packet in up link.
In the time of transfer uplink data bag, base station should transmit receive successful ack/nack (acknowledgement/non-acknowledgement, ACK/NACK) information in each in up link by user device transmissions on mutually should the data of subscriber equipment.On the other hand, in the time that downlink packet is transmitted, each user device transmissions is about reception success or the failed information of each packet by ACK/NACK communication in up link base station.
For the ul transmissions/received power that can maintain each subscriber equipment is at proper level, therefore base station answers transmission power control data to arrive each subscriber equipment in down link.
In aforementioned illustrated control signal, ack/nack signal, power control signal or similar signal are mainly only to need to use 1 can indicate corresponding information, thereby can be called as " 1 control signal ".
For energy valid function administrating system, necessary multiplexing Uplink/Downlink control signal, can carry the control information of above stated specification, particularly, 1 of multiplexed data packets control signal and other signal in time-frequency resources effectively.
The multiplexing method using as in multi-carrier mobile communication system, time division multiple access (time division multiple access, TDMA) method is by multiple signals being divided with multiplexing these signals in time-domain; Frequency division multiple access (frequency division multiple access, FDMA) method is by multiple signals being cut apart with multiplexing these signals in frequency domain; Code division multiple access (code division multiple access, CDMA) method is to use orthogonal code or quasiorthogonal code (or other available similar fashion), the signal on the multiplexing time-frequency domain specifying.
But, in the time only carrying out multiplexing 1 control signal by TDMA and/or FDMA method, because the through-put power of each control signal is different greatly, may be not identical in time-domain and/or frequency domain for the impact of adjacent cell.
For example, particularly in the time that the multiplexing ack/nack signal with transmission different user devices is carried out with TDMA or FDMA method in random community in single TTI, if the through-put power of the ack/nack signal of each subscriber equipment is different greatly, the interference volume that this respective cell puts on adjacent cell may be different greatly in time-domain or frequency domain.And this kind of situation may cause harmful effect in downlink packet scheduling or the source distribution of T/F-energy of cellular environment to effective execution.
In addition, when the control signal of ack/nack signal such as transmission ends and so on descending/when uplink channel transmission failure, in the time of this corresponding signal of transmission, have the problem of reliability.
Summary of the invention
technical problem
technical scheme
Correspondingly, the invention provides a kind of method for transmission of control signals in multi-carrier mobile communication system, the method can solve the one or more problems that cause due to the restriction of related prior art and shortcoming widely.
An object of the present invention is in order to provide a kind of method can effectively transmit multiple control signals, can the interference in control signal transmission be minimized effectively to carry out multiplexing mode by the method, and then transmit reliably the control signal of specific transmission ends.
Other advantage, object and a feature part of the present invention will be set forth hereinafter, and a part is for those of ordinary skills by below becoming apparent or can being obtained from the practice of the present invention.Pass through write specification and its claim and accompanying drawing specifically noted structure and can understand and obtain these objects of the present invention and other advantages.
In order to realize these objects with other advantages and according to object of the present invention, as embodied in this article and general description, according to the method for a kind of transmission of control signals of the present invention, the method is by the control signal of code division multiple access (CDMA) multiplexing multiple 1 bits in the time-frequency domain of predetermining; In different frequency territory, repeat described multiplexing control signal; And transmit the control signal of described repetition.
For reaching aforementioned and other advantage and according to object of the present invention, as the specific embodiment in specification and broad description, according to the method for a kind of transmission of control signals of the present invention, the method comprises with multiplexing multiple 1 control signal in the time-frequency domain of predetermining of code division multiple access (CDMA); And transmit described multiplexing control signal, wherein said multiple 1 control signal comprise multiple 1 control signal for specific transmission ends.
Preferred versions is that wherein this time-frequency domain of predetermining is included in 1 time-frequency domain in OFDM symbol band.
Preferred versions is, in the time being used for transmitting the time-domain of described control signal and including single OFDM symbol band, carries out above-mentioned repetition in the mode that the described multiplexing control signal in described single OFDM symbol band is repeated in described different frequency domain.
Preferred versions is, wherein, in the time being used for transmitting the time-domain of described control signal and including multiple OFDM symbol band, carry out above-mentioned repetition in the mode that the described demultiplex control signal in the described OFDM symbol band differing from one another is repeated in described different frequency domain.
Preferred versions is, when multiplexing, described multiple 1 control signal are by being used to the orthogonal or quasiorthogonal code of each of multiplexing described 1 control signal and being distinguished.
Preferred versions is that described multiple 1 control signal are distinguished by different quadrature phase components respectively and be modulated; And wherein when multiplexing, described multiple 1 control signal are further distinguished by the different orthogonal phase component for described modulation.
Preferred versions is, described in the time-frequency domain predetermined comprise multiple time-frequency domains; Wherein in multiplexing step, can realize by least one in time division multiple access (TDMA) and frequency division multiple access (FDMA) additional multiplexingly, and wherein be re-used by being dispersed in described multiple time-frequency domain for multiple 1 control signal of described specific transmission ends.
Preferred versions is to be re-used in described multiple time-frequency domains by described code division multiple access respectively for 1 control signal of different transmission ends.In this case, be re-used by different orthogonal or quasiorthogonal codes for multiple 1 control signal of described specific transmission ends.
And described orthogonal or quasiorthogonal code comprises a yard sequence, its length is corresponding to the size of described multiple time-frequency domains.
In addition, this 1 control signal can comprise ack/nack signal or power control signal.And this 1 control signal can be transmitted at up link or down link.
Be understandable that, aforementioned overview of the present invention is described and the following detailed description is all exemplary with illustrative, and is intended to be further explained for desired the present invention.
According to specific embodiments of the invention, in the time of multiplexing multiple 1 control signal, mainly use CDMA method.In addition, can be respectively by different orthogonal or quasiorthogonal codes the multiple control signals with transmission special user equipment.Therefore, can promote the reliability of corresponding control signal transmission.
And, can be by realize FDMA and/or TDMA method to transmit 1 control signal simultaneously, and by multiple control signals, the frequency range of coherent to be increased in (coherent) and/or the multiplexed signals amount in the coherent time of distribution mode special user equipment on each time-frequency domain with transmission.
In addition, in the situation that transmitting 1 control signal by multiple time-frequency domains, use orthogonal code (this orthogonal code according to the size of whole time-frequency domain but not indivedual time-frequency domain size for transmission) by explicitly pointing out, can increase the control signal amount that can simultaneously transmit.
In addition, be used to transmit at multiple OFDM symbols under the situation of 1 control signal, on different OFDM symbol areas, transmit 1 control signal with CDMA modulation by different frequency territory, can have effectively execution transmission under resource efficiency and diversity gain feature.Meanwhile, also can in each OFDM symbol area, make power division more flexible.
Brief description of the drawings
Accompanying drawing shows embodiments of the present invention, and it is used to provide further understands the present invention, and together with the description for explaining principle of the present invention.
In the accompanying drawings:
Fig. 1 is the explanation schematic diagram according to the multiplexing method that passes through CDMA technology transferring ACK/NACK signal of specific embodiments of the invention;
Fig. 2 realizes the explanation schematic diagram of the multiplexing method with transferring ACK/NACK signal end to end according to pass through CDMA and the FDMA technology of specific embodiments of the invention;
Fig. 3 realizes the multiplexing explanation schematic diagram with transferring ACK/NACK signal end to end according to pass through CDMA, TDMA and the FDMA technology of specific embodiments of the invention;
Fig. 4 realizes the multiplexing explanation schematic diagram with transferring ACK/NACK signal end to end according to pass through CDMA and the FDMA technology of specific embodiments of the invention, and wherein the multiple ack/nack signals that transmitted by specific transmission ends in multiple ack/nack signals are transmitted by multiple frequency domains;
Fig. 5 is the multiplexing explanation schematic diagram with transferring ACK/NACK signal that passes through CDMA, TDMA and FDMA technology and be implemented to end end according to specific embodiments of the invention, and wherein the multiple ack/nack signals that transmitted by specific transmission ends in multiple ack/nack signals are transmitted by multiple frequency domains;
Fig. 6 is the explanation schematic diagram with transferring ACK/NACK signal according to 1 OFDM symbol band of use (symbol zone) of specific embodiments of the invention;
Fig. 7 is the explanation schematic diagram with transferring ACK/NACK signal according at least 2 OFDM symbol bands of use of specific embodiments of the invention;
Fig. 8 is that at least 2 OFDM symbol bands of use of foundation preferred embodiment of the present invention are with the explanation schematic diagram of transferring ACK/NACK signal; And
Fig. 9 is the principle of the flexibility that increases power division is transmitted in explanation schematic diagram according to the specific embodiment of Fig. 8.
Embodiment
Here will be carefully with reference to preferred embodiment of the present invention, the example is shown in accompanying drawing.
Generally, base-station transmission ack/nack signal, the packet that each subscriber equipment in this signal designation community transmits is be successfully received or take defeat; Or control signal, it plays the part of the similar role of this ack/nack signal with respective user equipment in down link.Like this, when multiple subscriber equipmenies can be in single TTI when transfer uplink data bag, base station also can be simultaneously in single TTI transferring ACK/NACK signal to these multiple subscriber equipmenies.
In addition, the multiplexing multiple power control signals in base station to be to control the through-put power of uplink data of the multiple subscriber equipmenies in the single TTI in community, and then transmit this multiplexed signals to each subscriber equipment.
Therefore, according to specific embodiments of the invention, in order effectively to carry out multiplexing and to transmit multiple 1 control signal, this embodiment provides a kind of multiplexing method to transmit multiple 1 control signal by CDMA method in the part time-frequency domain of the transport tape in multicarrier system.And, with reference to specific embodiment, it is described.
Meanwhile, the explanation of embodiments of the invention relates to 1 control signal and is the situation of ack/nack signal.In method according to the transmission of control signals of embodiments of the invention, if not necessarily ack/nack signal of 1 control signal.And significantly, for a person skilled in the art, the present invention includes 1 random control signal under the form being transmitted in 1TTI.
Fig. 1 is the explanation schematic diagram according to the multiplexing method that passes through CDMA technology transferring ACK/NACK signal of specific embodiments of the invention.
With reference to Fig. 1, according to embodiments of the invention, the special time-frequency domain in 1 TTI of base station preservation is to use as transferring ACK/NACK.In addition, the ack/nack signal of different user devices is by adding orthogonal or quasiorthogonal code to be distinguished to time-frequency domain.
In the case, " orthogonal code " or " quasiorthogonal code " is used to multiplexed signals in CDMA method, and can be used as indication code taking instruction correlation as zero or value as being less than the situation of assign thresholds.
According to preferred embodiment of the present invention, when the modulation technique by use the orthogonal component of phase place as QPSK method is to carry out in the situation of transmission, multiple ack/nack signals can additionally be distinguished by different quadrature phase components.
In the embodiment shown in fig. 1, in the time that the ack/nack signal time-frequency domain that is 6 the OFDM symbols of leap by include 12 subcarriers in single TTI is transmitted, can use chip length is that the orthogonal code of 72 (=6x12) is with transferring ACK/NACK signal.Therefore, can transmit 72 different orthogonal signalling simultaneously.But, the orthogonal signalling that many whiles can be transmitted may along with used orthogonal/type of quasiorthogonal code and changing.
In the situation that embodiment uses QPSK as modulator approach as shown in Figure 1, can use two quadrature phases.Therefore, altogether can transmit the different orthogonal signal of the doubling dose of 72 orthogonal signalling.
Meanwhile, the ack/nack signal of sole user's equipment can be transmitted by the single orthogonal signalling in the orthogonal signalling so that preceding method was produced.But, specific embodiments of the invention propose exceed the information of 1 or in single TTI, transmit under the situation of multiple packets at sole user's equipment in single ack/nack signal carrying, and the ack/nack signal of sole user's equipment is set for by multiple orthogonal signalling and is transmitted.
As aforementioned illustrated specific embodiments of the invention, carrying out multiplexing and transferring ACK/NACK signal at down link by CDMA method has following advantage: it can be maintained relatively equal for a large amount of interference that produced by the ack/nack signal on the time-frequency domain at single TTI at down link.
Especially, in random community in the case of carrying out multiplexing and transmit the ack/nack signal of different user devices with TDMA or FDMA method in single TTI, as above stated specification is mentioned, if difference is large each other for the ack/nack signal through-put power of individual user's equipment, the interference volume that these respective cell are added on adjacent cell may be different greatly in time-domain or frequency domain.And this kind of situation may cause harmful effect in downlink packet scheduling or the At All Other Times-frequency-Energy distribution of cellular environment to effective execution.But, in as specific embodiments of the invention with the multiplexing ack/nack signal of CDMA method in the situation that, even in the time that different ack/nack signal through-put powers are assigned to different user devices, the ack/nack signal of all subscriber equipmenies is added in together in same time-frequency domain of single TTI, and is then transmitted.Therefore, the variation of through-put power on time-frequency domain can be reduced to minimum.
As specific embodiments of the invention, be be transmitted by multiple orthogonal signalling in the situation that at multiple ack/nack signals (these signals are transmitted by sole user's device transmission or in order to transmit sole user's device data), can improve the reliability of transferring ACK/NACK signal to corresponding subscriber equipment.
In addition, the downlink transmission principle of the ack/nack signal of above stated specification can be applied in ul transmissions in the same manner.
Simultaneously, when with the multiplexing ack/nack signal of CDMA method, as above stated specification is mentioned, by the orthogonality with between the multiplexing different ack/nack signals of CDMA method, only have and on the time-frequency domain of this ack/nack signal of carrying, be not changed when too many when down link radio channel response feature, its orthogonality just can be maintained.Therefore,, there is no use such as under the special receiving algorithm the channel equalizer of receiving terminal, still can obtain satisfied receptivity.Preferred versions is, in time-frequency domain, realizes with the multiplexing ack/nack signal of CDMA method, and in this time-frequency domain, radio channel response is not changed too much, in coherent time and coherent frequency range.
According to detailed specific embodiment of the present invention, the multiplexing method of useful FDMA or TDMA realizes transmission with the multiplexing ack/nack signal of CDMA method, to dwindle the time-frequency domain with the multiplexing ack/nack signal of CDMA method in coherent scope, wherein in this coherent scope, radio channel response feature is not changed too much.It below will be described.
Fig. 2 realizes the explanation schematic diagram of the multiplexing method with transferring ACK/NACK signal end to end according to pass through CDMA and the FDMA technology of specific embodiments of the invention.
With reference to figure 2, in the time-frequency domain that different ack/nack signals can be separated from each other on two frequency axiss, be transmitted.And different ack/nack signals can be re-used with CDMA method in each time-frequency domain.In the case, according to specific embodiments of the invention, in the time that ack/nack signal is transmitted by two frequency domains, the width that can be observed each frequency domain is to be configured to 6 subcarrier bands, and its width is less than 12 subcarrier bands.
Especially, in the embodiment shown in Figure 2, because each of this two time-frequency domains all comprises 6 OFDM symbols and 12 subcarriers, therefore can be by 36 (=6x6) orthogonal signalling of CDMA method transmission.Because two time-frequency domains are to be used in single TTI, therefore can transmit 72 (=36x2) orthogonal signalling.
Using under the situation of QPSK modulation, owing to can using two quadrature phases to separate ack/nack signal with further region, therefore can transmit the different orthogonal signalling of the doubling dose that is equivalent to these 72 orthogonal signalling.
Fig. 3 realizes the multiplexing explanation schematic diagram with transferring ACK/NACK signal end to end according to pass through CDMA, TDMA and the FDMA technology of specific embodiments of the invention.
Especially, Fig. 3 shows embodiment, and this example is by realizing multiplexing ack/nack signal with CDMA, FDMA and TDMA method simultaneously.
With reference to Fig. 3, different ack/nack signals can be transmitted on 4 less time-frequency domains of channel variation.In addition, different ack/nack signals can use CDMA method to be re-used in each time-frequency domain.
Especially, in the embodiment shown in fig. 3, because each time-frequency domain comprises three OFDM symbols and six subcarriers, therefore in each time-frequency domain, can transmit 18 (=3x6) ack/nack signals with CDMA method.Because four time-frequency domains are used in single TTI, therefore also can transmit 72 (=18x4) ack/nack signals.Because two quadrature phases can be used as QPSK transmission, therefore can transmit the ack/nack signal of the doubling dose that is equivalent to this different ack/nack signal.
In the aforementioned ack/nack signal multiplexing method shown in Fig. 2 or Fig. 3, for transmitting different ack/nack signals at each time-frequency domain, the method more has superiority than the method shown in Fig. 1.In method shown in Fig. 1, each ack/nack signal can not be to be transmitted in changing too large time-frequency domain having radio channel response feature; But, in the time-frequency domain as loading ACK/NACK signal, specify the radio channel quality of subscriber equipment bad, the ACK/NACK receptivity of respective user equipment can decline widely.
Therefore, specific embodiments of the invention propose the ack/nack signal of specific subscriber equipment in single TTI can by cross on the time-frequency domain away from multiple T/F axles, transmit.In addition, specific embodiments of the invention also propose the method for obtaining the T/F diversity gain receiving at the ack/nack signal of receiving terminal, and the method is by the ack/nack signal with CDMA method multiplexing different user devices in each time-frequency domain.
Fig. 4 is the method key diagram of transferring ACK/NACK signal, and according to specific embodiments of the invention, the method by realizing multiplexing ack/nack signal with CDMA and FDMA method simultaneously; The multiple ack/nack signals that wherein transmitted by specific transmission ends in multiple ack/nack signals are to be transmitted by multiple frequency domains.
With reference to Fig. 4, receiving terminal can be obtained frequency diversity gain to cross over transmission in the mode of two different frequency domains with ack/nack signal.In embodiment as shown in Figure 4, ack/nack signal is crossed over transmission and is re-used in each time-frequency domain at two time-frequency domains and different ack/nack signals.
Especially, because each time-frequency domain comprises six OFDM symbols and six subcarriers, therefore in each time-frequency domain with 36 (=6x6) ack/nack signals of CDMA method reusable.Because two quadrature phases can be used as QPSK transmission, therefore can transmit the ack/nack signal of the doubling dose that is equivalent to this different ack/nack signal.
As above stated specification is mentioned, use orthogonal code (size according to each time-frequency domain adjusts) with multiplexing different ack/nack signal in each time-frequency domain time, the ack/nack signal of the special user equipment being transmitted by different time-frequency domain, can be by the identical orthogonal code in the orthogonal code that is used in each time-frequency domain to be re-used.
But embodiments of the invention propose the ack/nack signal of the special user equipment being transmitted by different time-frequency domain, can be by using being used in different orthogonal code in each time-frequency domain with multiplexing.
Therefore, to use in each time-frequency domain mutually different orthogonal codes and while being re-used for the ack/nack signal of special user equipment, can avoid during receptivity Yin TedingT TI in specific ack/nack signal with reduced impact and be lowered by the certain orthogonal of other multiplexing ack/nack signals of CDMA.In addition, extensible the method is to make the ack/nack signal of special user equipment, even be transmitted by least three time-frequency domains in the situation that at this ack/nack signal, also can use different orthogonal code in different time-frequency domain to transmit the ack/nack signal of this special user equipment.
As shown in Figure 4, when ack/nack signal is while being transmitted by multiple time-frequency domains, preferred embodiment of the present invention proposes to transmit the method for more ack/nack signals simultaneously; The method is to utilize concrete orthogonal code of specifying corresponding whole time-frequency domain size, but not concrete orthogonal code of specifying corresponding each time-frequency domain size is then correspondingly transmitted multiple ack/nack signals.
Especially, in the embodiment shown in fig. 4, by obtaining the orthogonal code (6x12 of chip length 72, according to 6 the OFDM symbols and 12 subcarriers that belong to two time-frequency domains, these two time-frequency domains are the multiple ack/nack signals for carrying special user equipment) but not chip length 36 (according to 6 the OFDM symbols and 6 subcarriers that belong to single time-frequency domain), in the situation that using QPSK technical transmission signal, can use different quadrature phases to transmit 144 ack/nack signals simultaneously.
In the case, due to the radio channel response problem that difference causes greatly the orthogonality between orthogonal code to decline to each other of different time-frequency domain, can be by distribute the ACK/NACK through-put power differing from one another to overcome this problem according to the crossing correlative character of the part between orthogonal code.
Especially, if by code low orthogonality in the aforementioned orthogonal code of specifically noting being divided to the through-put power of the orthogonal code in respective sets with coupling in groups, above-mentioned orthogonality problem can be solved.
Fig. 5 is the method key diagram of transferring ACK/NACK signal, and according to specific embodiments of the invention, the method by realizing multiplexing ack/nack signal with CDMA, TDMA and FDMA method simultaneously; The multiple ack/nack signals that wherein transmitted by specific transmission ends in multiple ack/nack signals will be transmitted by multiple frequency domains.
Fig. 5 shows that wherein the ack/nack signal of special user equipment is crossed over the embodiment of transmission at two different time-frequency domains, obtains in this way T/F diversity gain.
Especially, the ack/nack signal of subscriber equipment 1 to N/4 is that the time-frequency domain of the time-frequency domain of upper left by being positioned at Fig. 5 part and the bottom right part that is positioned at Fig. 5 is transmitted, and the ack/nack signal of subscriber equipment N/4+1 to N/2 to be the time-frequency domain of the lower-left part by being positioned at Fig. 5 and the time-frequency domain that is positioned at the upper right part of Fig. 5 be transmitted.
Especially, in the embodiment shown in fig. 5, the ack/nack signal of special user equipment is crossed over transmission on two time-frequency domains.Follow different ack/nack signals and in each time-frequency domain, carried out multiplexing and transmission with CDMA method.
In addition, 18 ack/nack signals can be transmitted by the orthogonal code across the corresponding chip length 18 (=3x6) of three OFDM symbols and six subcarriers in each time-frequency domain.Because two quadrature phases can be used in QPSK transmission, therefore altogether can transmit 36 different ack/nack signals of the qdx that is equivalent to aforementioned ack/nack signal.
In the embodiment shown in fig. 5, distinguishable go out special user equipment by the ack/nack signal of different time-frequency domain transmission and the ack/nack signal of other use same orthogonal code.But, can be by obtaining diversity gain with the multiplexing ack/nack signal in each time-frequency domain of different orthogonal code.
In addition, in the embodiment shown in fig. 5, according to whole time-frequency domain size but not according to indivedual time-frequency domain sizes specifically to specify orthogonal code in the situation that, can transmit more ack/nack signals simultaneously.
Especially, the orthogonal code that the chip length being made up of six OFDM symbols altogether and 12 subcarriers concrete appointment is 72, but not therefore the orthogonal code that the chip length being made up of three symbols and six subcarriers is 18 can transmit more ack/nack signals simultaneously.
In the specific embodiment shown in earlier figures 1 to 5, for example, 1 control signal, as ack/nack signal, is by being distributed in CDMA method in 3 or 6 OFDM symbol bands to be transmitted.But, can be used for transmission as the OFDM symbol band of 1 of ack/nack signal control signal, it can comprise at least one or more OFDM symbol.
In foundation 1 control signal (ack/nack signal) transmission method of aforementioned specific embodiments of the invention, wherein, for the method to guarantee that transmission diversity gains at multiple time-frequency domain repeatedly transmitting ACK/NACK signals, the method can be according to numerous spendable OFDM symbol bands by variation.In the following description, by explanation according to numerous OFDM symbols that are used for transferring ACK/NACK signal with the effective method of transferring ACK/NACK signal.
Fig. 6 is the explanation schematic diagram with transferring ACK/NACK signal according to 1 OFDM symbol bands of use of specific embodiments of the invention.
In detail, Fig. 6 shows that four ack/nack signals are distributed in 1 OFDM symbol band with invasin (spreading factor, SF) 4, then multiplexing with CDMA method and transmit these ack/nack signals.In Fig. 6, single frame table shows single subcarrier band.In addition A, ijrepresent by with the multiplexing ack/nack signal of CDMA method.In this embodiment, " i " representative is dispersed and the index of multiplexed signals, and " j " represents the index of this multiplexing ack/nack signal group.ACK/NACK group represents the ack/nack signal set that is re-used and transmits.In addition, multiple ACK/NACK groups can be according to the necessity of each system and resource statuss and are existed.For the convenience on clearly demonstrating and illustrating, only there is single ACK/NACK group in Fig. 6 hypothesis.
Because the present embodiment hypothesis is only used single OFDM symbol with transferring ACK/NACK signal, therefore cannot obtain ack/nack signal and transmit the diversity gain on time shaft.
But if will obtain the diversity gain on frequency axis, the ack/nack signal being re-used on frequency axis with CDMA method can be repeated transmission in different frequency domains.
Fig. 6 shows an example, wherein in different frequency domains, is repeated four times with the multiplexing ack/nack signal of CDMA method.Here, four times are repeated just to obtain the example of diversity.Signal repetition number is according to the channel status of system and resource situation and change.In Fig. 6, each being repeated in the ack/nack signal of four times all has identical index (i, j) to emphasize its repeating signal as this signal.But each signal being repeated in the ack/nack signal of four times can be re-used by different orthogonal codes or similar fashion, therefore in such cases, these repeating signals can be the signals differing from one another.But for convenience of description, the otherness of each repeating signal will be left in the basket in the text.
Fig. 6 processes the situation of carrying out transmitting ACK/NACK signal with single OFDM symbol.The situation that uses single OFDM symbol is only for embodiments of the invention are described.And the present invention also can be applicable to use the situation of multiple OFDM symbols.
More particularly, be transmitted by several OFDM symbols in the situation that at ACK/NACK, on time shaft repeating signal same with repeating signal on frequency axis be enforceable, to obtain extra diversity and transmission antenna diversity.
Below will illustrate and use the situation of multiple OFDM symbols with transferring ACK/NACK signal.
In the situation that increasing OFDM symbol weight with transferring ACK/NACK signal, in the time using single OFDM symbol with transferring ACK/NACK signal, ack/nack signal can be re-used in the OFDM symbol that cooperation increases.In the case, due to the OFDM symbol for transferring ACK/NACK signal is increased, can there be more signal powers to be used for transferring ACK/NACK signal.Therefore, can transferring ACK/NACK signal to the wide region of community.
Fig. 7 is the method key diagram of transferring ACK/NACK signal, and according to specific embodiments of the invention, the method is used at least 2 OFDM symbol bands with transferring ACK/NACK signal.
Fig. 7 shows ack/nack signal transmission method, and the method is processed when being used for the number of OFDM symbol of transferring ACK/NACK signal and is increased while being two, and ack/nack signal has the invasin identical with Fig. 6.Especially, Fig. 7 shows the structure while using single OFDM symbol with transferring ACK/NACK signal as Fig. 6, and this structure can complete and repeated application to the two OFDM symbols.
When stating before use structure and transmitting, even in the time increasing symbol quantity, the ack/nack signal quantity that can transmit is equivalent to use the situation of single OFDM symbol.This is because only using under the situation of single OFDM symbol, in the time that more multi-OFDM symbol is used for transmitting the ack/nack signal being only repeated on frequency axis, by rolling up T/F number of repetition, more time-frequency resource is used for transmitting the ack/nack signal of equal number.
In the time carrying out transmission with the method, more power can be assigned to ack/nack signal transmission, but the wasting of resources may occur.There iing more multi-OFDM symbol be used for transferring ACK/NACK signal to reduce the wasting of resources in the situation that, if by increasing the number of iterations of each OFDM symbol on frequency axis to carry out transmission, time-frequency domain identical during with the single OFDM symbol situation of use is occupied.Therefore, can be compared with efficent use of resources.
Fig. 8 is the method key diagram of transferring ACK/NACK signal, and according to specific embodiments of the invention, the method is used at least 2 OFDM symbol bands with transferring ACK/NACK signal.
Fig. 8 shows embodiment, and by increasing the repetition number of the ack/nack signal on frequency axis, resource is more effectively utilized in this embodiment.In this example, ack/nack signal is to be re-used with CDMA method, and is to be two in the case of being increased for the OFDM symbol quantity of transferring ACK/NACK signal.
When being increased for the OFDM symbolic number of transferring ACK/NACK signal, compared with repetition in Fig. 6 four times, although ack/nack signal is repeated twice, uses four times of time-frequency resources territories and use the situation of single OFDM symbol identical.
Apply identical ack/nack signal structure to the situation comparison of whole OFDM symbol with execution transmission with passing through shown in Fig. 7, suppose to use same time-frequency resource, Fig. 8 shows that the transmission of ack/nack signal may be two times.Therefore, resource can more effectively be utilized.
Compare with Fig. 7, due to the time-frequency resources territory number for transferring ACK/NACK signal is increased, be used for the signal power of transferring ACK/NACK signal may diminish.But because total ack/nack signal is crossed over transmission at time-frequency domain, the transmit power allocation of each symbol may be more efficient than only carrying out the situation of transferring ACK/NACK signal with single OFDM symbol.
With reference to Fig. 8, in the time using multiple OFDM symbol bands with transferring ACK/NACK signal, according to specific embodiments of the invention, taking the different frequency domain by each OFDM symbol band to transmit the method for specific ack/nack signal, can realize more neatly power division to each ack/nack signal; So just than using the method for carrying out transferring ACK/NACK signal by the different frequency territory in each OFDM symbol band more to have superiority in power division flexibility.Below will describe in detail with reference to Fig. 9 this.
Fig. 9 illustrates in the situation with the specific embodiment transferring ACK/NACK signal in Fig. 8, the principle that power division flexibility is increased.
At Fig. 9 (a) and (b), A 1, A 2, A 3and A 4represent respectively the ack/nack signal group with the transmission of CDMA method.Especially, Fig. 9 (a) shows to be wherein by be repeated the form that the mode in different frequency territory is transmitted in same-sign band with the multiplexing ack/nack signal of CDMA.And Fig. 9 (b) shows to be wherein by being repeated the form that the mode in different frequency territory is transmitted respectively in different OFDM symbol bands according to the specific embodiment of the invention with the multiplexing ack/nack signal of CDMA.
In the case of ack/nack signal be transmitted in the mode identical with Fig. 9 (a), the gross power that is dispensed to indivedual OFDM symbol bands should be assigned with by the mode that power is dispersed to two ack/nack signals.On the contrary, in the case of ack/nack signal be transmitted in the mode identical with Fig. 9 (b), the gross power that is dispensed to indivedual OFDM symbol bands can be assigned with by the mode that power is dispersed to four ack/nack signals.Therefore the flexibility, can bring to power distributing and higher than the situation of Fig. 9 (a).
In other words, when the quantity of the OFDM symbol band that can be used to transferring ACK/NACK signal is when plural number, as the specific embodiment of the invention, be by the case of the different frequency territory in different OFDM symbols is transmitted at ack/nack signal, the flexibility of power division is increased the power division with each user's of energy variation ack/nack signal.
In the aforementioned specific embodiment of the invention, for the invasin of multiplexing multiple ack/nack signals, in the repetition number of time-frequency domain and for the OFDM symbol quantity of transferring ACK/NACK signal, three is only for being used for correctly illustrating embodiments of the invention, but other invasin, other repetition number and various OFDM number of symbols all can be applicable to the present invention.
In the aforementioned illustrated embodiment of the present invention according to time-frequency resources, only point out to use single transmission antenna and the situation that do not use transmission antenna diversity.The present invention also can select to be applied in the two transmission antenna diversity methods of use or four transmission antenna diversity methods.
Significantly for a person skilled in the art, above-mentioned explanation for obtain the method for T/F diversity gain from ack/nack signal transmission, the method can be used with FDMA method or TDMA method and CDMA method simultaneously, with according to the multiplexing different ack/nack signal of specific embodiments of the invention.
Multiplexing and transferring ACK/NACK signal method of above stated specification can be applied to equally at multiplexing and communicating downlink and be transferred in the method for multiple power control signals of different user devices.Particularly, down link ack/nack signal and downlink power control signal can be by being re-used and transmitting with CDMA method in same time-frequency domain.
In addition, the method multiplexing and transferring ACK/NACK signal of above stated specification can be applicable in the transmission of ul ack/NACK signal of packet equally, and this packet is also transmitted at down link.
In addition, in particular system, be transformable if make for the OFDM symbol quantity of transferring ACK/NACK signal, preferably can increase and the repeat number of reduction ack/nack signal according to used OFDM symbolic number.
industrial applicibility
According to specific embodiments of the invention, in the time of multiplexing multiple 1 control signal, multiple control signals of special user equipment can and mainly be used CDMA method to transmit by different to each other orthogonal or quasiorthogonal codes.Therefore, the present invention improves the reliability in corresponding control signal transmission.
In addition, can be by realize FDMA and/or TDMA method to transmit 1 control signal and to transmit the multiple control signals of special user equipment on each time-frequency domain by distributed earth, to obtain frequency and/or time diversity simultaneously.
In addition, by multiple time-frequency domains to transmit under the situation of 1 control signal, by explicitly pointing out use orthogonal code, (it is for transmission, and the size according to whole time-frequency domain is determined but not each time-frequency domain is big or small), can increase the control signal number that can simultaneously be transmitted.
In addition, to be used for transmitting under the situation of 1 control signal at multiple OFDM symbols, transmit with CDMA method and be modulated at 1 control signal on different OFDM symbol areas by different frequency domains, can promote the transmission advantage on aspect resource efficiency and diversity gain.And, also can in each OFDM sign field, reach power division more flexibly.
Therefore, have and be suitable for being applied in the configuration in 3GPP LTE system according to control information transmission method of the present invention.In addition, can be applicable to Random Communication system according to control information transmission method of the present invention, this system and 3GPP LTE system need to be used for the specification of the control information transformat of time-frequency domain.
Although the present invention is described and illustrates with reference to its preferred embodiment, clearly those skilled in the art can carry out various amendments and variation to it, and does not depart from spirit of the present invention or category.Therefore, amendment of the present invention and the variation of providing in claims and equivalent regions thereof is provided in the present invention.

Claims (8)

1. a method that is sent successful ack/nack ACK/NACK information by base station, described method comprises:
Use different orthogonal codes that multiple ACK/NACK are multiplexed into ACK/NACK group; And
Send described ACK/NACK group by multiple resource collections of predetermined number, each subcarrier that pre-determines number being included in an orthogonal frequency division multiplex OFDM symbol of multiple resource collections of described predetermined number,
Wherein, the multiple ACK/NACK in described ACK/NACK group are distinguished mutually by different orthogonal codes,
Wherein, multiple resource collections of described predetermined number are separated mutually along frequency axis,
Wherein, in the time that the number of the OFDM symbol for ACK/NACK transmission is one, multiple resource collections of described predetermined number are in single OFDM symbol.
2. method according to claim 1, wherein, in the time that the number of the OFDM symbol for described ACK/NACK transmission is two, multiple resource collections of described predetermined number are alternately at two OFDM symbols.
3. method according to claim 1 and 2, wherein, the described multiple ACK/NACK in described ACK/NACK group are additionally distinguished by different quadrature phase components.
4. method according to claim 1 and 2, wherein, the each of described different orthogonal code has length 4, and multiple resource collections of described predetermined number each comprises 4 subcarriers.
5. a method that is received successful ack/nack ACK/NACK information by subscriber equipment, described method comprises:
Each reception ACK/NACK group of the multiple resource collections by predetermined number, described ACK/NACK group comprises the multiple ACK/NACK that use different orthogonal codes, each subcarrier that pre-determines number being included in an orthogonal frequency division multiplex OFDM symbol of multiple resource collections of described predetermined number
Wherein, the multiple ACK/NACK in described ACK/NACK group are distinguished mutually by different orthogonal codes,
Wherein, multiple resource collections of described predetermined number are separated mutually along frequency axis, and
Wherein, in the time that the number of the OFDM symbol for ACK/NACK transmission is one, multiple resource collections of described predetermined number are in single OFDM symbol.
6. method according to claim 5, wherein, in the time that the number of the OFDM symbol for described ACK/NACK transmission is two, multiple resource collections of described predetermined number are alternately in two OFDM symbols.
7. according to the method described in claim 5 or 6, wherein, the described multiple ACK/NACK in described ACK/NACK group are by additionally by distinguishing for the different quadrature phase component of modulating described multiple ACK/NACK.
8. according to the method described in claim 5 or 6, wherein, the each of described different orthogonal code has length 4, and multiple resource collections of described predetermined number each comprises 4 subcarriers.
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