BRPI0710379A2 - método e aparelhos para a execução h-arq em um sistema de comunicação sem fio mimo - Google Patents
método e aparelhos para a execução h-arq em um sistema de comunicação sem fio mimo Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0625—Transmitter arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0637—Properties of the code
- H04L1/0643—Properties of the code block codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0637—Properties of the code
- H04L1/0662—Limited orthogonality systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
- H04L1/0618—Space-time coding
- H04L1/0637—Properties of the code
- H04L1/0668—Orthogonal systems, e.g. using Alamouti codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1845—Combining techniques, e.g. code combining
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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Abstract
Método e aparelhos para a execução H-ARQ em um sistema de comunicação sem fio MIMO. Um método híbrido e aparelhos para a execução automática repetir pedido (H-ARQ) em um múltiplo-input multiple-output (MIMO) sistema de comunicação sem fio são divulgados. Um transmissor transmite, pelo menos, dois pacotes de dados através de duas ou mais antenas. Se pelo menos um dos pacotes de dados não é transmitida com sucesso, o transmissor retransmite os pacotes de dados ao mesmo tempo a mudar os pacotes de dados em uma forma espalhando ortogonais. Alternativamente, o transmissor maio retransmitir apenas os pacotes de dados transmitidos sem sucesso junto com um novo pacote de dados que substitui um pacote de dados transmitidos com sucesso. Os pacotes de dados transmitidos sem sucesso pode simplesmente ser repetido sem alterar seu formato. Quando somente os pacotes de dados transmitidos sem sucesso é retransmitida, juntamente com o novo pacote de dados, as transmissões podem ser combinadas para recuperar os pacotes de dados e retransmitida ao novo pacote de dados simultaneamente.
Description
Método e aparelhos para a execução H-ARQ em um sistema de comunicação semfio MIMO.
Domínio da invenção
A presente invenção está relacionada a sistemas decomunicação sem fio. Mais particularmente, a presente invenção está relacionada a ummétodo híbrido e aparelhos para a execução automática repetir pedido (H-ARQ) em ummúltiplo-input multiple-output (MIMO) sistema de comunicação sem fio.JUSTIFICATIVA
H-ARQ transmissão é um regime que é largamente utilizadaem muitos sistemas de comunicação sem fio para assegurar o sucesso a transmissão dedados. Em H-ARQ1 um receptor envia um feedback ao transmissor, indicando êxito ousem êxito recepção de um pacote de dados, de modo que o transmissor retransmite umpacote de dados falhou.
MIMO é uma técnica usada para aumentar a taxa de dadose sistema de caudal. Em um sistema MIMO, um transmissor e um receptor utilizarmúltiplas antenas para transmissão e recepção de dados para que múltiplos fluxos sãotransmitidos simultaneamente através de múltiplas antenas.
H-ARQ Diferentes regimes de transmissão têm sidopropostas para Sistemas MIMO. Em uma simples repetição convencional H-ARQ paraum regime MIMO sistema, os símbolos são simplesmente repetidos em uma posteriortransmissão se a transmissão primária falhar. A Tabela 1 mostra sinal de acordo com astransmissões convencionais simples repetitivas H-ARQ para um sistema 2x2 MIMO.
Tabela 1
<table>table see original document page 2</column></row><table>
Um espaço tempo bloquear código (STBC)-H baseia-ARQpara um regime MIMO sistema foi proposto para o rádio terrestre evoluiu acessouniversal (EUTRA). A Tabela 2 mostra sinal transmissões de acordo com o STBC à basede H-ARQ para um sistema 2x2 MIMO.
Tabela 2
<table>table see original document page 2</column></row><table>
Em um sistema 2x2 MIMO, como um exemplarsistema MIMO, recebeu um sinal pode ser expresso da seguinte forma<formula>formula see original document page 3</formula>
Equation (1)
where t is an index in time, yi, i=l,2, is received signals atreceive antenna i, hij> i*7=l>2, is channel coefficients between receive antenna i andtransmit antenna j, xj,j=l,2, is transmitted signals at transmit antenna j, and m, i=l,2, is anoise at receive antenna i. It is assumed that the channel is quasi-static so that thechannel coefficients are same during retransmission of the failed packet and the timeindex on the channel coefficients will be dropped hereinafter.
At a high signal-to-noise ratio (SNR)1 the SNR for the twodata streams after linear minimum mean square error (LMMSE) detection is written asfollows:
<formula>formula see original document page 3</formula>
Equation (2)
and.
<formula>formula see original document page 3</formula>
Equation (3)
where Es is symbol energy, NO is noise power spectrumdensity, and
<formula>formula see original document page 3</formula>
Equation (4)Equation (5)Equation (6)
An SNR ratio between two data streams is:
<formula>formula see original document page 3</formula>
Equation (7)
The SNR ratio in Equation (7) or its variation is used ascriteria in assigning a modulation and coding scheme (MGS) for each of the data streams.[0012] For the conventional simple repetitive H-ARQ transmission, the received signal inthe retransmission is written as follows:
<formula>formula see original document page 3</formula>
Equation (8)
[0013] Combining Equation (1) and Equation (8) results in:<formula>formula see original document page 4</formula>Equation (9)
At a high SNR1 the SNRs for the two data streams, afterLMMSE detection, are as follows:
<formula>formula see original document page 4</formula>The SNRs are 3 dB higher than initial transmission. TheSNR ratio between the two data streams is the same as the initial transmission.
For the STBC-based H-ARQ1 the signal received for theretransmission is written as follows:
<formula>formula see original document page 4</formula>Combining Equation (12) and Equation (1) results in:
<formula>formula see original document page 4</formula>
Equation (13)
At high SNR1 the SNRs after LMMSE detector for the two
data streams are as follows:
<formula>formula see original document page 4</formula>Equation (14)
Comparing Equations (10), (11) and (14), it can be seen thatSTBC-based H- ARQ increases the total SNR across the two data streams compared tothe simple repetitive H-ARQ when the cross term |c| Φ O , which is generally true for arandom MIMO channel.
However, in many practical systems, to achieve themaximum capacity offered by the MIMO channel, a data rate assigned to each spatialdata stream is controlled separately according to its own SNR. This scheme is oftenreferred to as per-antenna rate control (PARC).. At the initial transmission, the transmitter,(e.g., a Node-B), would allocate a higher modulation and coding scheme (MCS) to theantenna with a higher SNR and allocate a Iower MCS to the antenna with a Iower SNR.Since the MCS is often kept the same for each antenna when retransmission occurs, it isdesirable to keep the same SNR ratio between the antennas after retransmissions.However, the STBC-based H-ARQ scheme equalizes the SNR across ali data streamsafter packet combining as shown in Equation (14). Therefore, the STBC-based H-ARQscheme is not suitable for systems that adaptively change data rate per spatial stream,(e.g., PARC).SUMMARY
The present invention is related to a method and apparatusfor implementing H-ARQ in a MIMO wireless communication system. A transmittertransmits at Ieast two data packets via two or more antennas. If at Ieast one of the datapackets is not successfully transmitted, the transmitter retransmits the data packets whilerearranging the data packets in an orthogonal spreading manner. Alternatively, thetransmitter may retransmit only the unsuccessfully transmitted data packet along with anew data packet while replacing a successfully transmitted data packet. Theunsuccessfully transmitted data packet may simply be repeated without changing itsformat. When only the unsuccessfully transmitted data packet is retransmitted along withthe new data packet, the transmissions may be combined to recover the retransmitteddata packet and the new data packet simultaneously.BRIEF DESCRIPTION OF THE DRAWINGS
Amore detailed understanding of the invention may be hadfrom the following description of a preferred embodiment, given by way of example and tobe understood in conjunction with the accompanying drawings wherein:Figure 1 is a block diagram of a transmitter configured in accordance with the presentinvention; and
Figure 2 is a block diagram of a receiver configured in accordance with the presentinvention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention may be implemented in any type ofwireless communication systems including, but not Iimited to, wideband code divisionmultiple access (WCDMA), frequency division duplex (FDD), time division duplex (TDD),long term evolution (LTE) of the third generation (3G) system, orthogonal frequencydivision multiplexing (OFDM), or any other wireless communication system.
Figures 1 and 2 are block diagrams of a transmitter 100 anda receiver 200 configured in accordance with the present invention. The transmitter 100and the receiver 200 may be a wireless transmit/receive unit (WTRU) or a base station.The terminology "WTRU" includes but is not Iimited to a user equipment (UE), a mobilestation, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digitalassistant (PDA), a computer, or any other type of user device capable of operating in awireless environment. The terminology "base station" includes but is not Iimited to a Node-B1 a site controller, an access point (AP), or any other type of interfacing device capable ofoperating in a wireless environment.
The transmitter 100 includes at Ieast two antennas 102, anH-ARQ transmitter 104 and a controller 106. The H-ARQ transmitter 104 transmits at Ieasttwo data packets simultaneously via the antennas 102 by implementing an H-ARQmechanism. The H-ARQ transmitter 104 retransmits data packets if at Ieast one of thedata packets is not successfully transmitted. The controller 106 arranges data packets forretransmission in accordance with an orthogonal spreading H-ARQ scheme, a modifiedrepetitive H-ARQ scheme or a modified STBC-based H-ARQ scheme in accordance withthe present invention, which will be explained in detail hereinafter.
The receiver 200 includes at Ieast two antennas 202, an H-ARQ receiver 204 and a data processor 206. The receiver 200 may optionally include adata combiner 208. Data transmitted by the transmitter 100 is received by the antennas202. The H-ARQ receiver 204 receives the data by implementing an H-ARQ mechanism.The data processor 206 recovers data packets transmitted by the transmitter 100. If thetransmitter 100 retransmits an unsuccessfully transmitted data packet along with a newdata packet which replaces a successfully transmitted, data packet when at Ieast one datapacket is not successfully delivered to the receiver 200 at an initial transmission, the datacombiner 208 may combine retransmitted data and the initially received data aftersubtracting the successfully received data packet from the initially received data. The dataprocessor 206 then simultaneously processes the unsuccessfully transmitted data packetand the new data packet that are transmitted together in retransmission. The transmit andreceive processing will be explained in detail hereinafter.
An orthogonal spreading-based H-ARQ scheme inaccordance with the present invention is explained. Table 3 shows signal transmissions ηaccordance with the orthogonal spreading-based H-AEQ scheme of the present inventionfor an exemplary 2x2 MIMO system. It should be noted that the 2x2 MIMO system isprovided as an example, not as a limitation, and the present invention may be applied to asystem employing more than two (2) antennas.
Table 3
<table>table see original document page 6</column></row><table>A received signal for the retransmitted packet is written asfollows:
<formula>formula see original document page 7</formula>
Equation (15)
Combining Equation (15) and Equation (1) results in:
<formula>formula see original document page 7</formula>
Equation (16)
An LMMSE receiver to ^stimate Ac1 and x2from Equation(16) is as follows:
<formula>formula see original document page 7</formula>
Equation (17)
where
<formula>formula see original document page 7</formula>
At a high SNR, the post-MMSE SNR for the two datastreams are as follows:
<formula>formula see original document page 7</formula>
Equation (18)
and
<formula>formula see original document page 7</formula>
Equation (19)
The total SNR across ali data streams is increasedcompared to the conventional simple repetitive H-ARQ scheme. The SNR afterretransmission is shown in Equations (18) and (19). The SNR ratio between the two datastreams is the same as the initial transmission, which is a desired feature for PARC-enabled MIMO systems.
The orthogonal spreading-based H-ARQ scheme can beeasily extended to more than two antenna systems. Assuming a symbol vector to betransmitted over N antennas is xo = (xux2,---xΝ). The orthogonal spreading- based H-ARQ transmission pattern is determined by:<formula>formula see original document page 8</formula>
where UN is an NxN unitary matrix. The re-th column of thematrix X is transmitted during the n-th transmission. Table 4 shows signal transmissions inaccordance with the present invention for an exemplary 4x4 MIMO system.
Table 4
<table>table see original document page 8</column></row><table>
In accordance with another embodiment of the presentinvention, when one of the transmitted data packets is not successfully received, only thefailed data packet is retransmitted along with a new data packet. The new data packetreplaces the successfully transmitted data packet. For example, in a 2x2 MIMO system,data packets X1 and x2 are transmitted via two antennas, and data packet X1 issuccessfully received, but data packet xz is not. In conventional systems, both packets xxand x2 are retransmitted subsequently. In accordance with the present invention, only thefailed packet x2 is retransmitted and the successfully transmitted packet *, is nottransmitted. Instead1 a new data packet x3 is transmitted along with the failed packet x2.
Table 5 shows signal transmissions in accordance with thepresent invention and a conventional STBC-based H-ARQ scheme for an exemplary 2x2MIMO system. In the conventional STBC-based H-ARQ, both packets jc, and x2 areretransmitted in different formats as shown in Table 5. In accordance with the presentinvention, a new data packet x3 replaces the successfully received packet *, of theconventional STBC-based H-ARQ system, and the failed data packet x2 and the new datapacket JC3 are transmitted as in STBC-based H-ARQ scheme as shown in Table 5. It isassumed that no PARC type of rate adaptation is used in this case. To simplify receiverdesign, the format of the new packet *3 may be identical to the data packet X1 in thesecond transmission, (i.e., conjugated and inversed). Alternatively, the format for the newdata packet x3 may be different from data packet Xλ.
<table>table see original document page 8</column></row><table>Table 5
At the receiver, since data packet Jc1 is receivedsuccessfully, the decoded bits of data packet X1 are reconstructed and subtracted fromreceived data for the first transmission. The modified received data is then combined withthe received data for the second transmission. Spatial diversity is achieved in theretransmitted data packet, (i.e., data packet x2 ). This arrangement improves an SNR ofnew data packet x3 which will be explained hereinafter.
] The received signal of the first transmission is as inEquation (1). After subtracting the successfully received data packet *, from the receiveddata, it becomes as follows:
<formula>formula see original document page 9</formula>
Equation (21)
Packet x3 is added into Equation (21) to facilitate descriptionhereafter.
The received signal for the second transmission is written asfollows: yi (t + ϊ)Λ Jhn (t + I) A12(Z + Ι)Υ Λ-2 /Ζ1 (Ζ + I)
<formula>formula see original document page 9</formula>
Equation (22)
Combining Equations (21) and (22) results in:
<formula>formula see original document page 9</formula>
Equation (23)
Equation (23) converts two 2x2 system into a virtual 2x4system. Conventional LMMSE may be applied to demodulate packets x2 and x3 asfollows:
<formula>formula see original document page 9</formula>
Equation (24)
Where<formula>formula see original document page 10</formula>
In quasi-static channel, spatial diversity is achieved onretransmitted data packet x2 with reduced interference due to zero elements in the matrixabove. Assuming quasi-static channel and dropping time índex t, at high SNR1 the SNRsof the data streams for the second transmission are written as follows:
<formula>formula see original document page 10</formula>
Where d1 = |h11|2+|h12|2+|h21|2+|h22|2, d2 =|h12|2+|h22|2, and c= -h11h12-h21h22With respect to new data packet x3 , a conventional detection technique may be used,where packet x2 is detected independently from two transmissions followed by amaximum ratio combining (MRC)1 and packet x3 is detected only using the secondtransmission. In other words, conventional technique solves Equations (21) and (22)separately, then perform combining. In Equation (21), since ali effective channelcoefficients corresponding to X3 equal to zero (0), only information on x2 can be derivedfrom Equation (21). With this detection technique, the SNRs are as follows:
<formula>formula see original document page 10</formula>
The SNR of packet x2 is identical in both techniques.However, a better SNR on x3 is achieved in accordance with the present invention, whencomparing Equations (26) and (28), and considering d{ > dx'.
The present invention may be extended to systems withmore than two antennas. Tables 6 and 7 show examples of extension to a four antennasystem. Table 6 shows conventional STBC-based H-ARQ scheme and Table 7 shows anSTBD-based H-ARQ scheme with the successfully transmitted packet being replaced witha new packet in accordance with the present invention.<table>table see original document page 11</column></row><table>
Table 6
<table>table see original document page 11</column></row><table>
Table 7
Alternatively1 the failed packet x2 may be simply repeatedand a new packet x3 is transmitted along with the packet x2 simultaneously. Table 8shows signal transmissions in accordance with the present invention and a conventionalsimple repetitive H-ARQ scheme for an exemplary 2x2 MIMO system. In the conventionalsimple repetitive H-ARQ scheme, the spatial stream that is successfully received is Ieftblank for retransmission. In accordance with the present invention, a new data packet x3is transmitted in place of the blank packet. Therefore, higher spectral efficiency isachieved.
<table>table see original document page 11</column></row><table>
Table 8
The received signal of the first transmission is as in Equation(1).
<formula>formula see original document page 11</formula>
Equation (29)After subtracting data bits of the successfully received datapacket X1 from the initially received data, it becomes as follows:
<formula>formula see original document page 12</formula>
Equation (29)
The received signal for the second transmission is written asfollows: fy,(t + ίη = fhu(t + I) Λ(1 + l)Yx3Wn1Ct + I)
<formula>formula see original document page 12</formula>
Equation (30)
<formula>formula see original document page 12</formula>
Combining Equations (29) and (30) results in:
<formula>formula see original document page 12</formula>
Equation (31)
Instead of solving Equations (29) and (30) followed by acombiner, the present invention applies LMMSE to solve Equation (31) as follows:
<formula>formula see original document page 12</formula>
follows:
<formula>formula see original document page 12</formula>
At high SNR, the post-MMSE SNRs for xz and x3 axe as
<formula>formula see original document page 12</formula>
For a conventional receiver, data is detected separately foreach transmission before being combined. In other words, conventional detection solvesEquations (29) and (30) separately, then combine post detected signal. Assuming LMMSEreceiver is used to solve Equation (31), and a maximal ratio combining (MRC) is used tocombine post-detection signal, the combined SNR for data x2 and x3 at high SNR can bewritten as:
<formula>formula see original document page 13</formula>
By comparing Equations (33) and (35), it is shown that theSNR of the retransmitted data packet xz is identical for both the conventional scheme andthe present invention. However, by comparing Equations (34) and (36), it is shown thatthe SNR of new data packet x3 is improved using the present invention, since d χ > d [.Embodiments.
1. A method for implementing H-ARQ in a MIMO wireless communication system.
2. The method of embodiment 1, comprising a transmitter transmitting at Ieast two datapackets to a receiver.
3. The method of embodiment 2, comprising the transmitter retransmitting the datapackets to the receiver while rearranging the data packets in an orthogonal spreadingmanner for retransmission if at Ieast one of the data packets is not successfullytransmitted.
4. The method as in any one of embodiments 2-3, wherein PARC is performed fortransmitting the data packets.
5. The method as in any one of embodiments 2-4, wherein both the transmitter and thereceiver include two (2) antennas, and the transmitter transmits data symbols xl and x2via two antennas at initial transmission and transmits data symbols xl and -x2 atretransmission.
6. The method as in any one of embodiments 2-4, wherein both the transmitter and thereceiver include four (4) antennas, and the transmitter transmits data symbols xl, x2, x3and x4 via four antennas at initial transmission, and transmits data symbols xl, -x2, x3 and-x4 at a first retransmis sion.
7. The method of embodiment 6, wherein the transmitter transmits data symbols xl, x2, -x3 and -x4 at a second retransmission.
8. The method of embodiment 7, wherein the transmitter transmits data symbols xl, -x2, -x3 and x4 at a third retransmission.
9. The method of embodiment 2, comprising if at Ieast one of the data packets is notsuccessfully transmitted at an initial transmission, the transmitter retransmitting theunsuccessfully transmitted data packet along with a new data packet which replaces asuccessfully transmitted data packet.
10. The method of embodiment 9, comprising the receiver constructing the successfullytransmitted data packet.
11. The method of embodiment 10, comprising the receiver subtracting the successfullytransmitted data packet from initially received data.
12. The method of embodiment 11, comprising the receiver combining retransmitted dataand the initially received data after subtracting the successfully transmitted data packet.
13. The method of embodiment 12, comprising the receiver performing a processing toobtain the unsuccessfully transmitted data packet at the initial transmission and the newdata packet at the same time.
14. The method as in any one of embodiments 9-13, wherein the unsuccessfullytransmitted data packet is simply repeated without changing a format as in an initialtransmission.
15. The method as in any one of embodiments 9-13, wherein the unsuccessfullytransmitted data packet and the new data packet are arranged in accordance with STBC-based H-ARQ scheme.
16. The method as in any one of embodiments 9-15, wherein a format for the new datapacket is identical to the successfully transmitted data packet.
17. The method as in any one of embodiments 9-15, wherein a format for the new datapacket is different from the successfully transmitted data packet.
18. The method as in any one of embodiments 9-17, wherein PARC is performed fortransmitting the data packets.
19. A transmitter for implementing H-ARQ in a MIMO wireless communication system.-20. The transmitter of embodiment 19, comprising at Ieast two antennas.
21. The transmitter of embodiment 20, comprising an H-ARQ transmitter for transmittingat Ieast two data packets simultaneously via the antennas and retransmitting the datapackets if at Ieast one of the data packets is not successfully transmitted.
22. The transmitter as in any one of embodiments 19-21, comprising a controller forrearranging the data packets in an orthogonal spreading manner for retransmission.
23. The transmitter as in any one of embodiments 19-22, wherein PARC is performed fortransmitting the data packets.
24. The transmitter as in any one of embodiments 19-23, wherein both the transmitter anda receiver include two (2) antennas, and the controller transmits data symbols xl and x2via two antennas at initial transmission and transmits data symbols xl and -x2 atretransmission.
25. The transmitter as in any one of embodiments 19-23, wherein both the transmitter anda receiver include four (4) antennas, and the controller transmits data symbols xl, x2, x3and x4 via four antennas at initial transmission, and transmits data symbols xl, -x2, x3 and-x4 at a first retransmission.
26. The transmitter of embodiment 25, wherein the transmitter transmits data symbols xl,x2, -x3 and -x4 at a second retransmission.27. The transmitter of embodiment 26, wherein the transmitter transmits data symbols xl, -x2, -x3 and x4 at a third retransmission.
28. The transmitter of embodiment 20, comprising an H-ARQ transmitter for transmittingat Ieast two data packets via the antennas and retransmitting data packets if at Ieast oneof the data packets is not successfully transmitted at an initial transmission.29. The transmitter of embodiment 28, comprising a controller for controlling the H-ARQtransmitter such that only the unsuccessfully transmitted data packet is retransmittedalong with a new data packet which replaces a successfully transmitted data packet.30 The transmitter as in any one of embodiments 28-29, wherein the unsuccessfullytransmitted data packet is simply repeated without changing a format.31. The transmitter as in any one of embodiments 28-30, wherein a format for the newdata packet is identical to the successfully transmitted data packet.
32. The transmitter as in any one of embodiments 28-30, wherein a format for the newdata packet is different from the successfully transmitted data packet.
33. The transmitter as in any one of embodiments 28-31, wherein PARC is performed fortransmitting the data packets.
34. A receiver for implementing H-ARQ in a MIMO wireless communication system.
35. The receiver of embodiment 34, comprising at Ieast two antennas.
36. The receiver of embodiment 35, comprising an H-ARQ receiver for receiving data froma transmitter, the transmitter retransmitting an unsuccessfully transmitted data packetalong with a new data packet which replaces a successfully transmitted data packet whenat Ieast one data packet is not successfully delivered to the receiver at an initialtransmission.
37. The receiver of embodiment 36, comprising a data processor for recovering datapackets transmitted by the transmitter.
38. The receiver of embodiment 37, comprising a data combiner for combiningretransmitted data and an initially received data after subtracting the successfully receiveddata packet from the initially received data, wherein the data processor processes theunsuccessfully transmitted data packet and the new data packet that are transmittedtogether in retransmission simultaneously.39. The receiver as in any one of embodiments 36-38, wherein the unsuccessfullytransmitted data packet is simply repeated without changing a format.40. The receiver as in any one of embodiments 36-39, wherein a format for the new datapacket is identical to the successfully transmitted data packet.41. The receiver as in any one of embodiments 36-39, wherein a format for the new datapacket is different from the successfully transmitted data packet.
Although the features and elements of the present inventionare described in the preferred embodiments in particular combinations, each feature orelement can be used alone without the other features and elements of the preferredembodiments or in various combinations with or without other features and elements ofthe present invention. The methods or flow charts provided in the present invention maybe implemented in a computer program, software, or firmware tangibly embodied in acomputer-readable storage médium for execution by a general purpose computer or aprocessor. Examples of computer-readable storage mediums include a read only memory(ROM), a random access memory (RAM), a register, cache memory, semiconductormemory devices, magnetic media such as internai hard disks and removable disks,magneto-optical media, and optical media such as CD- ROM disks, and digital versatiledisks (DVDs).
Suitable processors include, by way of example, a generalpurpose processor, a special purpose processor, a conventional processor, a digital signalprocessor (DSP), a plurality of microprocessors, one or more microprocessors inassociation with a DSP core, a controller, a microcontroller, Application Specific IntegratedCircuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type ofintegrated circuit (IC)1 and/or a state machine.
A processor in association with software may be used toimplement a radio frequency transceiver for use in a wireless transmit receive unit(WTRU), user equipment (UE), terminal, base station, radio network controller (RNC)1 orany host computer. The WTRU may be used in conjunction with modules, implemented inhardware and/or software, such as a camera, a video camera module, a videophone, aspeakerphone, a vibration device, a speaker, a microphone, a television transceiver, ahands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radiounit, a Iiquid crystal display (LCD) display unit, an organic light-emitting diode (OLED)display unit, a digital music player, a media player, a video game player module, anInternet browser, and/or any wireless local area network (WLAN) module.
Claims (28)
1. Um método híbrido para a execução automática repetirpedido (H-ARQ) em um múltiplo-input multiple-output (MIMO) sistema de comunicaçãosem fio, o método compreendendo: um transmissor transmitindo pelo menos dois pacotesde dados para um receptor, o transmissor e os dados retransmitting pacotes para oreceptor ao mesmo tempo a mudar os pacotes de dados em uma forma ortogonal deretransmissão se espalhando pelo menos um dos pacotes de dados não é transmitidacom sucesso.
2. O método da reivindicação 1 tarifa antena onde per-controle (PARC), é realizada pela transmissão de pacotes de dados.
3. O método da reivindicação 1 em que tanto o emissor eoreceptor inclui dois (2) antenas, o transmissor e transmite dados e símbolos xi X2 atravésde duas antenas na transmissão primária e transmite dados e símbolos Xi-X2 aretransmissão.
4. O método da reivindicação 1 em que tanto o emissor eoreceptor inclui quatro (4) antenas, e que o transmissor transmite dados símbolos xi, X2,X3 e X4 através de quatro antenas na transmissão primária, e transmite dados símbolosxi,-X2, X3 e -X4 numa primeira retransmissão.
5. O método de reivindicação 4 onde o transmissortransmite dados símbolos xi, X2, X3-e-X4, numa segunda fase, retransmissão.
6. O método de crédito 5 onde o transmissor transmitedados símbolos xi,-X2, X3 e X4-a uma terceira retransmissão.
7. Um método híbrido para a execução automática repetirpedido (H-ARQ) em um múltiplo-input multiple-output (MIMO) sistema de comunicaçãosem fio, o método compreendendo: um transmissor transmitindo pelo menos dois pacotesde dados para um receptor, e se pelo menos uma das os pacotes de dados não étransmitida com sucesso em uma transmissão inicial, o transmissor sem êxitoretransmitting os pacotes de dados transmitidos juntamente com um novo pacote dedados que substitui um pacote de dados transmitidos com sucesso.
8. O método de crédito suplementar 7 compreendendo: aconstrução de um receptor com êxito pacotes de dados transmitidos, o receptorsubtraindo os pacotes de dados transmitidos com sucesso a partir de dados recebidosinicialmente, o receptor de dados e retransmitida combinando os dados recebidos após aprimeira fase com sucesso transmitiu subtraindo os pacotes de dados, e da receptorrealizando uma transformação para obter os pacotes de dados transmitidos sem êxito nasua primeira transmissão de dados e os novos pacotes, ao mesmo tempo.
9. O método de crédito 7 onde vão os pacotes de dadostransmitidos é simplesmente repetida sem alterar um formato como em uma transmissãoinicial.
10. O método de reivindicação 9 onde vão os pacotes dedados transmitidos e os dados novos pacotes são dispostos de acordo com o espaçotempo bloco codificação (STBG)-H baseia-ARQ regime.
11. O método de reivindicação 9 onde um novo formatopara o pacote de dados é idêntico ao pacote de dados transmitidos com sucesso.
12. O método de reivindicação 9 onde um novo formatopara o pacote de dados é diferente de transmitir dados pacotes com êxito.
13. O método de crédito per-7 onde antena taxa de controle(PARC), é realizada pela transmissão de pacotes de dados.
14. Um transmissor de execução automática repetir pedidohíbrida (H-ARQ) em um múltiplo-input multiple-output (MIMO) sistema de comunicaçãosem fio, o transmissor compreendendo: pelo menos duas antenas, uma H-ARQtransmissor para o envio de pelo menos dois pacotes de dados simultaneamente atravésdas antenas e retransmitting os pacotes de dados se pelo menos um dos pacotes dedados não é transmitida com sucesso, e um controlador para mudar o ortogonais dadospacotes em uma forma espalhando para a retransmissão.
15. O transmissor de crédito onde 14 por antena taxa decontrole (PARC), é realizada pela transmissão de pacotes de dados.
16. O transmissor de 14 em que ambos afirmam que otransmissor e um receptor de incluir dois (2) antenas, o controlador e transmite dados esímbolos xi X2 através de duas antenas na transmissão primária e transmite dados esímbolos xi-X2 a retransmissão.
17. O transmissor de 14 em que ambos afirmam que otransmissor e um receptor inclui quatro (4) antenas, o controlador transmite dados esímbolos xi, X2, X3 e X4 através de quatro antenas na transmissão primária, e transmitedados χα símbolos,-X2, X3 e -X4 numa primeira retransmissão.
18. O transmissor de crédito em que os 17 símbolostransmissor transmite dados xi, X2, X3-e-X4, numa segunda fase, retransmissão.
19. O transmissor de 18 naquilo que afirmam que otransmissor transmite dados símbolos xi,-X2, X3 e-x ± a um terço retransmissão.
20. Um transmissor de execução automática repetir pedidohíbrida (H-ARQ) em um múltiplo-input multiple-output (MIMO) sistema de comunicaçãosem fio, o transmissor compreendendo: pelo menos duas antenas; "um transmissoresARQ-H de transmissão de dados pelo menos dois maços através das antenas eretransmitting pacotes de dados se pelo menos um dos pacotes de dados não étransmitida com sucesso em uma transmissão primária, e um controlador de comando deH-ARQ transmissor sem sucesso, de modo que apenas os pacotes de dados transmitidosé retransmitida, juntamente com um novo pacote de dados que substitui um pacote dedados transmitidos com sucesso.
21. O transmissor de crédito em que os 20 pacotes de dadostransmitidos sem sucesso é simplesmente repetida sem alterar o formato.
22. O transmissor de crédito 20 formato para o qual um novopacote de dados é idêntico ao pacote de dados transmitidos com sucesso.
23. O transmissor de crédito 20 formato para o qual um novopacote de dados é diferente de transmitir dados pacotes com êxito.
24. O transmissor de crédito onde 20 por antena taxa decontrole (PARC), é realizada pela transmissão de pacotes de dados.
25. Um receptor de execução automática repetir pedidohíbrida (H-ARQ) em um múltiplo-input multiple-output (MIMO) sistema de comunicaçãosem fio, o receptor compreendendo: pelo menos duas antenas; H-ARQ um receptor parareceber dados de um transmissor, o transmissor sem êxito retransmitting um pacote dedados transmitidos juntamente com um novo pacote de dados que substitui um pacote dedados transmitidos com sucesso quando pelo menos um pacote de dados não forentregue com sucesso para o receptor em uma transmissão primária ; Um processadorde dados para recuperar os pacotes de dados transmitidos pelo emissor; um combinadordados retransmitida para combinar os dados e os dados recebidos após uma primeirafase subtraindo os dados recebidos com sucesso inicialmente recebeu o pacote dedados, onde o processador processa os dados sem sucesso e os pacotes de dadostransmitidos novos pacotes de dados que são transmitidos em conjunto de retransmissãosimultânea.
26. O receptor de crédito em que os 25 pacotes de dadostransmitidos sem sucesso é simplesmente repetida sem alterar o formato.
27. O receptor de crédito 25 formato para o qual um novopacote de dados é idêntico ao pacote de dados transmitidos com sucesso.
28. O receptor de crédito 25 formato para o qual um novopacote de dados é diferente de transmitir dados pacotes com êxito.
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KR20080111565A (ko) | 2008-12-23 |
TW200746682A (en) | 2007-12-16 |
US8059610B2 (en) | 2011-11-15 |
RU2395165C1 (ru) | 2010-07-20 |
AR060519A1 (es) | 2008-06-25 |
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KR101032666B1 (ko) | 2011-05-06 |
CA2649886A1 (en) | 2007-11-01 |
AU2007240912B2 (en) | 2010-05-20 |
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IL194793A0 (en) | 2009-08-03 |
MX2008013496A (es) | 2009-03-31 |
MY142202A (en) | 2010-10-29 |
TW201025895A (en) | 2010-07-01 |
KR20080108612A (ko) | 2008-12-15 |
EP2014006A1 (en) | 2009-01-14 |
WO2007123904A1 (en) | 2007-11-01 |
RU2010111623A (ru) | 2011-09-27 |
AU2007240912A1 (en) | 2007-11-01 |
CN101427505A (zh) | 2009-05-06 |
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