WO2012096609A1 - Procédés et appareils pour transmissions mimo en liaison montante - Google Patents

Procédés et appareils pour transmissions mimo en liaison montante Download PDF

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Publication number
WO2012096609A1
WO2012096609A1 PCT/SE2011/051193 SE2011051193W WO2012096609A1 WO 2012096609 A1 WO2012096609 A1 WO 2012096609A1 SE 2011051193 W SE2011051193 W SE 2011051193W WO 2012096609 A1 WO2012096609 A1 WO 2012096609A1
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symbols
virtual antenna
user equipment
transmissions
dpdch
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PCT/SE2011/051193
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English (en)
Inventor
Johan Bergman
Bo Göransson
Johan Hultell
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Telefonaktiebolaget L M Ericsson (Publ)
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Publication of WO2012096609A1 publication Critical patent/WO2012096609A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H04B7/0434—Power distribution using multiple eigenmodes
    • 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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • 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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • 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
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme

Definitions

  • the embodiments described herein relate to uplink Multiple-Input Multiple- Output, MIMO in a communications system and in particular to transmission and signaling aspects related to uplink MIMO transmissions.
  • High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), together referred to as High Speed Packet Access (HSPA), are mobile communication protocols that were developed to cope with higher data rates than original Wideband Code Division Multiple Access (WCDMA) protocols were capable of.
  • WCDMA Wideband Code Division Multiple Access
  • the 3rd Generation Partnersh ip Project (3GPP) is a standards-developing organization that is continuing its work of evolving HSPA and creating new standards that allow for even higher data rates and improved functionality.
  • a radio access network implementing HSPA a user equipment (UE) is wirelessly connected to a radio base station (RBS) commonly referred to as a NodeB (NB).
  • RBS radio base station
  • NB NodeB
  • a radio base station is a general term for a radio network node capable of transmitting radio signals to a user equipment (UE) and receiving signals transmitted by a user equipment (UE).
  • uplink transmit diversity has evaluated the potential benefits of uplink transmit (Tx) diversity in the context of HSUPA.
  • Tx uplink transmit
  • UEs that are equipped with two o r more transmit antennas are capable of utilizing all of them for uplink transmissions. This is achieved by multiplying a UE output signal with a set of complex pre-coding weights, a so-called pre-coding vector with one pre-coding weight for each transmit antenna.
  • the rationale behind uplink transmit diversity is to adapt the pre-coding weights so that user and network performance is maximized .
  • the antenna weights may be associated with different constraints.
  • two classes of transmit diversity are considered:
  • Beamforming where the UE at a given time-instance can transmit from more than one antenna simultaneously.
  • beamforming it is possible to shape an overall antenna beam in the direction of a target receiver.
  • PA power amplifier
  • Switched antenna transmit d iversity can be seen as a special case of beamforming where one of the antenna weights is 1 (i.e. switched on) and the antenna weight of any other antenna of the UE is 0 (i.e. switched off).
  • a fundamental idea behind uplink transmit diversity is to exploit variations in the effective channel to improve user and network performance.
  • the term effective channel here incorporates effects of transmit antenna(s), transmit antenna weights, receiving antenna(s), as well as the wireless channel between transmitting and receiving antennas. Selection of appropriate antenna weights is crucial in order to be able to exploit the variations in the effective channel constructively.
  • the 3GPP evaluated the merits of open loop beam forming and open loop antenna switching for uplink transmissions in WCDMA HSPA. These techniques are based on that UEs equipped with multiple transmit antennas exploit existing feedback e.g.
  • F-DPCH Fractional Dedicated Physical Channel
  • E-HICH E-DCH HARQ Acknowledgement Indicator Channel
  • the purpose of pre-coding the signals is to "maximize" the signal to noise plus interference ratio (SIR) at the receiving NodeB. Since the network is unaware of the appl ied pre-coding weights the NodeBs will experience a discontinuity in the measured power whenever a change in pre-coding weights occurs.
  • SIR signal to noise plus interference ratio
  • Closed loop transmit diversity refers to both closed loop beam forming and closed loop antenna switching.
  • the network e.g., the serving NodeB
  • closed loop techniques are based on that the network, e.g., the serving NodeB, selects the pre-coding vector with which the signal is multiplied .
  • the NodeB can either rely on one of the existing physical channels, e.g., F-DPCH, or a new feedback channel could be introduced.
  • Uplink multiple-input-multiple-output (MIMO) transmission is another related technique that has been proposed as a candidate for WCDMA/HSPA in 3GPP standard release 1 1 .
  • a study item on uplink MIMO for WCDMA/HSUPA was started at the 3GPP RAN#50 plenary meeting.
  • For uplink MIMO different data is transmitted from different virtual antennas, where each virtual antenna corresponds to a different pre-coding vector. Note that closed loop beam forming can be viewed as a special case of uplink MIMO where no data is scheduled on one of two virtual antennas.
  • MIMO technology is mainly beneficial in situations where the "composite channel" is strong and has high rank.
  • the term composite channel includes the potential effects of transmit antenna(s), PAs, as well as the radio channel between the transmitting and receiving antennas.
  • the rank of the composite channel depends on the number of uncorrelated paths between the transmitter and the receiver. In situations where the rank of the composite channel is low e.g . where there is a l im ited amount of mu lti-path propagation and cross polarized antennas are not used, and/or the path gain between the UE and the NodeB is weak, single-stream transmissions, i.e. beam forming techniques, are generally preferred over MIMO transmissions. This results from a combined effect of that the theoretical gains of MIMO transmissions is marginal at low SIR operating point and that inter-stream interference can be avoided in case of single-stream transmissions.
  • Inner loop power control (ILPC) and outer loop power control (OLPC) are used to control the quality of the uplink transmission. More specifically, the ILPC is located in the NodeB(s) of an active set. The ILPC is used to ensure that a Dedicated Physical Control Channel (DPCCH) pilot quality target r ta rget is maintained. The serving NodeB monitors that the received power of the DPCCH pilot fulfills the quality target r ta rget and based on this monitoring the serving NodeB issues transmit power control (TPC) commands to the UE to raise or lower the transmission power of the DPCCH pilot.
  • DPCCH Dedicated Physical Control Channel
  • the ILPC controls the transmit power of all the physical channels.
  • the OLPC is located in the radio network controller (RNC) and it is used to adjust the quality target r ta rget used by the ILPC.
  • RNC radio network controller
  • the OLPC typically increases the quality target r ta rget if a too high block error rate (BLER) on E-DCH Dedicated Physical Data Channel (E-DPDCH) transmissions is observed.
  • BLER block error rate
  • the UE can transmit independent streams, i.e. different data from the different virtual antennas, simultaneously.
  • the data signals transm itted from the different virtual antennas will be associated with different radio link quality. An issue for such settings then becomes how to ensure that the radio link quality associated with all virtual antennas can be controlled.
  • An object of the present invention is to provide methods and apparatuses that at least to some extent facilitate improved control of radio link quality of uplink MIMO transmissions.
  • a first embodiment provides a method in a user equipment configured for uplink Multiple-Input Multiple- Output, MIMO, transmissions using a first virtual antenna and a second virtual antenna.
  • the method comprises a step of interleaving at least one encoded transport block over both the first virtual antenna and the second virtual antenna.
  • a second embodiment provides a method in a user equipment configured for uplink MIMO transmissions using a first virtual antenna and a second virtual antenna. According to the method at least one E-DPDCH is interleaved over both the first virtual antenna and the second virtual antenna.
  • a third embodiment provides a method in a user equipment configured for uplink MIMO transmissions using a first virtual antenna and a second virtual antenna. The method comprises transmitting data through the second virtual antenna.
  • the method further comprises detecting a need for physical layer retransmission of the data and performing physical layer retransmission the data through the first virtual antenna.
  • a fourth embodiment provides a user equipment comprising digital data processing circuitry configured to implement a first virtual antenna and a second virtual antenna.
  • the user equipment is configured for uplink MIMO transmissions using the first virtual antenna and the second virtual antenna.
  • the digital data processing circuitry is further configured to interleave at least one encoded transport block over both the first virtual antenna and the second virtual antenna.
  • a fifth embodiment provides a user equipment comprising digital data processing circuitry configured to implement a first virtual antenna and a second virtual antenna.
  • the user eq u i pment is config u red for u pl in k M I MO transmissions using the first virtual antenna and the second virtual antenna.
  • the digital data processing circuitry is further configured to interleave at least one E- DPDCH over both the first virtual antenna and the second virtual antenna.
  • a sixth embodiment provides a user equipment comprising digital data processing circuitry configured to implement a first virtual antenna and a second virtual antenna.
  • the user equipment is configured for uplink MIMO transmissions using the first virtual antenna and the second virtual antenna.
  • the digital data processing circuitry is configured to control that data is transmitted through the second virtual antenna.
  • the digital data processing circuitry is further configured to detect a need for physical layer retransmission of the data and to control that physical layer retransmission is performed of the data through the first virtual antenna.
  • a seventh embodiment provides a method in a user equipment configured for uplink MIMO transmissions.
  • the method comprises signaling to a network node whether the user equipment is performing uplink transmissions using single or multiple stream transmissions.
  • An eighth embodiment provides a user equipment configured for uplink MIMO transmissions.
  • the user equipment comprises digital data processing circuitry configured to control the user equipment to signal to a network node whether the user equipment is performing uplink transmissions using single or multiple stream transmissions.
  • An advantage of some of the embodiments described herein is that a quality difference between different encoded signals is reduced by interleaving the encoded signals over different virtual antennas.
  • the interleaving can be performed on different time-scales and at different stages of the transmission procedure.
  • encoded transport blocks are interleaved over the virtual antennas to achieve a more even quality between the transport blocks.
  • the interleaving of the encoded transport block is in some embodiments performed prior to physical channel mapping and in other embodiments after physical channel mapping.
  • a physical layer transmission of data and a physical layer retransmission of the same data are carried out from different virtual antennas to reduce the quality difference between data transmitted from different virtual antennas.
  • radio link quality associated with transmissions from the different virtual antennas may facilitate decoding at the receiver. Accordingly some embodiments of the invention provide for facilitated control of the quality of uplink MIMO transmissions by interleaving transmissions over different virtual antennas.
  • Another advantage of some of the embodiments described herein is that facilitated control of the quality of uplink MIMO transmissions is achieved by a user equipment signaling to a network node whether the user equipment is performing uplink transmissions using single or multiple stream transmissions. By making the network aware of whether single or multiple stream transmissions are used, it is easier for the network to take appropriate measures to control the radio link quality of the uplink transmissions.
  • Fig. 1 is a schematic block diagram illustrating a system in which different embodiments of this disclosure may be implemented.
  • Fig. 2 is a diagram illustrating fast fading of two different physicalantennas.
  • Fig. 3 is a schematic block diagram illustrating an embodiment of a user equipment architecture which can support uplink MIMO.
  • Fig. 4 is a schematic block diagram illustrating an alternative embodiment of a user equipment architecture which can support uplink MIMO.
  • Figs. 5a and 5b are flow diagrams illustrating embodiments of methods of this disclosure.
  • Fig. 6 is a schematic illustration of retransmission of data from different virtual antennas according to an embodiment.
  • Fig. 7 is a schematic illustration of retransmission of data from different virtual antennas according to an alternative embodiment.
  • Fig. 8 is a schematic illustration of an embodiment according to which symbols within a subframe are interleaved over virtual antennas.
  • Fig. 9 is a schematic illustration of an alternative embodiment according to which symbols within a subframe are interleaved over virtual antennas.
  • Fig. 10 is a schematic block diagram illustrating an embodiment according to which multiple transport blocks are interleaved over virtual antennas.
  • Fig . 1 1 is a schematic block diagram illustrating an embodiment according to which different parts of a transport block are interleaved over virtual antennas.
  • Fig . 12 is a flow diagram illustrating transport channel processing including interleaving over virtual antennas according to an embodiment.
  • Fig . 1 3 is a schematic block d iagram of a user equ ipment accord ing to an embodiment of this disclosure.
  • Fig. 1 is a schematic block diagram illustrating a system in which different embodiments of this disclosure may be implemented.
  • Fig. 1 shows a user equipment (UE) 1 1 configured to support uplink MIMO transmissions for communication with a network node 12, which for instance may be a serving NodeB.
  • the exemplary UE 1 1 is illustrated with two physical transmit antennas 13, 14 and the network node is illustrated with two physical receive antennas 15, 16.
  • the composite channel between the UE 1 1 and the network node 15 comprises wireless channels, h1 1 , h12, h21 and h22 between the different transmit antennas 13, 14 and receive antennas 15, 16 as illustrated in Fig. 1 .
  • different data such as a first signal s1 (t) and a second signal s2(t) as illustrated in Fig. 1
  • signals associated with the first virtual antenna 1 7 are pre-coded with pre- coding weights w1 and w2 prior to transmission from the different physical antennas 13 and 14.
  • Signals associated with the second virtual antenna 18 are pre-coded with pre-coding weights w3 and w4 prior to transmission from the different physical antennas 13 and 14.
  • the network e.g. a serving NodeB
  • the network has the ability to acquire knowledge about the channel. This is because for a UE 1 1 configured in uplink MIMO mode, knowledge about the channel characteristics are needed both to determine the rank of the channel and to determine suitable pre-coding vector(s).
  • h 2l h 22 denote the channel matrix of the wireless channel between the UE 1 1 and the network node 1 2.
  • h l2 denotes the wireless channel between a second transmit antenna 14 of the UE 1 1 and a first receive antenna 15 of the network node 12.
  • 0 be a matrix summarizing inaccuracies of power amplifiers (PAs) associated with the different physical antennas 13, 14.
  • PAs power amplifiers
  • a is a random variable that describes the inaccuracy associated with the first (upper) transmit branch
  • ⁇ is a random variable describing the inaccuracy of the PA associated with the second (lower) transmit branch illustrated in Fig. 1 .
  • the later is because the NodeB(s) need to be aware of the relative power difference ⁇ between the DPCCH pilots in order to estimate the channel as can be seen from Equation 4 above.
  • the channel is in turn necessary for performing the channel sounding in which suitable pre-coding vectors and the number of streams that should be scheduled is determined.
  • the serving and any non-serving NodeB are aware of the power difference ⁇ , it can either be signaled by the UE 1 1 or kept constant. The latter could be achieved with a single ILPC that adjust the transmit power of both the P-DPCCH and the S-DPCCH.
  • a problem with an architecture that relies on one ILPC and one OLPC is however that the DPCCH pilots may experience highly varying radio quality e.g. link capacity or block error rate (BLER) given a certain transport block size (TBS).
  • BLER block error rate
  • TBS transport block size
  • the radio link quality associated with the transmissions from the virtual antenna(s) that are not power controlled by the ILPC and OLPC will be exhibit large variations in quality.
  • having an asymmetric radio link quality associated with the transmissions from the different virtual antennas can result in that:
  • the ILPC and/or OLPC will increase the DPCCH transmit power associated with all virtual antennas until the weakest DPCCH fulfills the quality target "on average". This can be achieved by e.g. having the ILPC operating on the DPCCH associated with weakest received power. Alternatively, If the ILPC only operates on one of the streams and the OLPC operate on both streams the OLPC will increase the quality target used by the ILPC(s) so that the qual ity associated with the stream on wh ich the I LPC(s) does not consider, on average meets the DPCCH quality level. This will cause additional overhead since the transmit power of all physical channels is decided by the link that is weakest.
  • Radio link control RLC
  • MAC media access control
  • ILPC loop operate on the DPCCH associated with said selected virtual antenna so that transmissions through that virtual antenna is subject to ILPC power control.
  • transmissions through the other virtual antenna is not subject to ILPC but the transmission power used for transmissions on the other virtual antenna is rather set to the same transmission power as used for transmissions on the virtual antenna whose DPCCH is accounted for in the single ILPC loop.
  • the embodiments described below are particularly useful in scenarios where there is an issue of how the radio link quality of the transmissions can be controlled in an efficient manner. Therefore the embodiments described herein are particularly useful in scenarios with fewer ILPC loops than there are virtual antennas. However, even if there is an ILPC available for each virtual antenna, some of the embodiments described herein may still be used, even though the benefits are more limited when there are other means available for controlling the quality and transmission power of each individual virtual antenna.
  • Fig. 2 depicts two realizations of fast fading associated with two physical antennas by illustrating the instantaneous link quality in dB as a function of time of the two physical antennas. From Fig. 2 it is evident that the effective radio link quality for each virtual antenna can differ significantly.
  • the effective radio link quality for each virtual antenna includes the combined effect of pre-coding vectors and the link quality associated with each physical antenna.
  • realistic transmit antennas will typically be associated with different far-field antenna radiation patterns, see e.g. the 3GPP technical report TR 25.863, UTRA: Uplink Transmit Diversity for High Speed Packet Access for more information.
  • the difference in far-field antenna radiation patterns can often be in order of 3-5 dB and it will cause additional link quality asymmetry. Due to these effects, it follows that a solution in which only one of the two DPCCHs is power controlled, e.g., the P-DPCCH, will result in that the link quality associated with the transmissions from the other virtual antenna can be highly different.
  • varying physical layer qual ity amongst different streams is detrimental for the overall performance.
  • Fig . 3 and Fig. 4 illustrate two possible physical channel layouts for a UE configured in uplink MIMO mode comprising two physical antennas 13 and 14 and two virtual antennas 17 and 18.
  • the term physical channel encompass existing legacy channels, e.g. Fractional Dedicated Physical Channel (F-DPCH), E-DCH Dedicated Physical Control Channel (E-DPCCH), E-DCH Dedicated Physical Data Channel (E-DPDCH), etc.
  • F-DPCH Fractional Dedicated Physical Channel
  • E-DPCCH E-DCH Dedicated Physical Control Channel
  • E-DPDCH E-DCH Dedicated Physical Data Channel
  • the primary DPCCH (P-DPCCH) pilot and the secondary DPCCH (S-DPCCH) pilot are pre-coded with the same pre-coding vectors as used for pre-coding the other physical channels transmitted from each virtual antenna.
  • P-DPCCH and S-DPCCH are not pre-coded.
  • E-DPCCH used to describe the modulation used for the transmitted data signals can be transmitted from different or the same virtual antennas.
  • E-DPCCH(s) E-DCH Transport Format Combination Identifiers
  • E-TFCIs E-DCH Transport Format Combination Identifiers
  • transmissions of some or all encoded signals are interleaved over the virtual antennas. This will reduce the quality difference of the signals that are interleaved. For example if a transport block associated with a first stream is mapped to one E-DPDCH and a transport block associated with a second stream is mapped to another E-DPDCH, the two E-DPDCHs can be interleaved over the virtual antennas. It is also possible to interleave the transport blocks over the virtual antennas prior to physical channel mapping but after encoding.
  • the expression is intended to encompass both interleaving of the encoded transport block(s) prior to physical channel mapping as well as interleaving of the encoded transport block(s) after physical channel mapping, wherein the latter case corresponds to interleaving of the physical channel(s) to which the encoded transport block(s) was mapped. Note that it is possible to extend this to scenarios where multi-code E-DPDCHs are required for carrying the transport block. Furthermore, it is also possible that the data is encoded into one transport block and then the symbols in the transport block are mapped to the different virtual antennas. This will be explained further below.
  • Fig. 5a is a flow diagram illustrating a method in accordance with the above described first embodiment.
  • the method is performed in a user equipment configured for uplink MIMO transmissions using at least a first virtual antenna 17 and a second virtual antenna 1 8.
  • the method comprises a step 51 of interleaving at least one encoded transport block over both the first virtual antenna 17 and the second virtual antenna 18.
  • the interleaving can occur on different time-scales.
  • physical layer retransmissions of data are retransmitted from another virtual antenna than the data originally was transmitted from.
  • physical layer retransmissions of data that originally was transmitted through a virtual antenna whose link is not power controlled may be retransmitted from a virtual antenna that is power controlled. This can be beneficial because the performance associated with the transmissions from the virtual antenna that is not power controlled will be unpredictable, i.e. the physical layer can be both better as well as worse when compared to the quality associated with the power controlled link.
  • Fig. 5 b is a flow diagram illustrating a method according to the above described second embodiment.
  • the method is performed in a UE configured for uplink MIMO transmissions using at least a first virtual antenna 17 and a second virtual antenna 18.
  • the method comprises transmitting data through one of the virtual antennas, e.g. the second virtual antenna 18, in a step 52.
  • the UE detects a need for physical layer retransmission of the data.
  • the UE performs physical layer retransmission in a step 54 of the data through the other virtual antenna, i.e. through the first virtual antenna 17 assuming that the data first was transmitted through the second virtual antenna 18.
  • Fig. 6 and Fig. 7 illustrate schematically two examples of how retransmission according to the second embodiment can be carried out.
  • Fig. 6 illustrates that in a first subframe t1 both a transmission of a first packet 61 of data from a first virtual antenna 17, and a transmission of a second packet 62 of d ata from a second virtual antenna 18 are unsuccessful. After a retransmission of both the first packet 61 and the second packet 62 from different virtual antennas, the first packet 61 which was originally transmitted from the first virtual antenna 17 can be successfully in received in a subframe t2 whereas the second packet 62 still is erroneous. In a subsequent subframe t3, the second packet 62 is again transmitted from the second virtual antenna 1 8 whereas a new packet 63 is transmitted from the first virtual antenna 17.
  • Fig. 7 illustrates a similar scenario as in Fig. 6.
  • the difference with respect to the scenario in Fig. 6 is that there is only one E-HICH configured to MIMO users in the scenario in Fig . 7. Consequently both the first packet 61 and the second packet 62 need to be successfully receive before a new transmission can take place from any of the virtual antennas.
  • E-DPDCH(s) the encoded transport blocks
  • the encoded transport blocks (E-DPDCH(s)) and some other signals, e.g., the E-DPCCHs, are retransmitted from another virtual antenna.
  • the symbols of two signals associated with the different streams that are to be transmitted within one sub- frame are interleaved over the virtual antennas. This results in that part of the symbols in, e.g. an encoded transport block, is transmitted from one virtual antenna and part of the symbols is transmitted from the other virtual antenna.
  • FIGs. 8 and 9 illustrate two different examples in accordance with the above mentioned third exemplary embodiment.
  • Fig. 8 illustrates an embodiment in which symbols within a sub frame are time interleaved.
  • Fig. 8 schematically illustrates a first packet 81 associated with a first stream and a second packet 82 associated with a second stream that are to be transmitted within one subframe.
  • the symbols of the first and second packets 81 , 82 are time-interleaved over the first virtual antenna 17 and second virtual antenna 18, such that a first subset 83 of symbols of the first packet 81 is transmitted from the first virtual antenna 17 and a second subset 85 of symbols of the first packet 81 is transmitted from the second virtual antenna 18.
  • a first subset 84 of symbols of the second packet 82 is transmitted from the first virtual antenna 17 and a second subset 86 of symbols of the second packet 82 is transmitted from the second virtual antenna 18.
  • symbols in the first subset 83 of symbols of the first packet 81 are time multiplexed with symbols in the first subset 84 of symbols of the second packet 82.
  • symbols in the second subset 85 of symbols of the first packet 81 are time multiplexed with symbols in the second subset 86 of symbols of the second packet 82. Thanks to the time interleaving the quality difference associated with the transmissions from the two virtual antennas will be reduced.
  • Fig. 9 illustrates a similar scenario as in Fig. 8 with the only difference that there are two E-H ICHs in the scenario in Fig . 9. Thus, transmission of new packets can take place as soon as one of the packets has been successfully received.
  • Fig. 9 it is illustrated that symbols of a third packet 83 are interleaved over the virtual antennas 17, 18 and time multiplexed with symbols of the second packet 82 after the first packet has been successfully received in the subframe t1 .
  • Fig. 10 is a schematic block diagram illustrating an embodiment according to which multiple transport blocks are interleaved over virtual antennas 17, 18.
  • Fig. 10 illustrates that data 100 is encoded in two separate transport blocks 103, 104 associated with different streams 101 , 102 respectively.
  • a functional block, an interleaver 105 interleaves symbols of the transport blocks 103 and 104 over both of the virtual antennas 17, 18.
  • Fig. 1 1 symbols associated with one encoded signal in a certain sub-frame is partitioned across the two virtual antennas 17, 18 so that part of the symbols are transmitted from one virtual antenna and part of the symbols are transmitted from the other virtual antenna.
  • data 1 1 1 here first is encoded in to one transport block 1 12 independently on whether single or dual stream transmission is used. Then, if dual stream transmission occurs, the transport block 1 12 is partitioned into two parts 1 13, 1 14 and each part is transmitted from a separate virtual antenna 17, 18. Numerous ways for partitioning the data are possible.
  • the transport block size (TBS) of the transport blocks could either be different or identical for different streams. If the TBS for some of the streams is required to be identical, the uplink overhead can furthermore be reduced since it is sufficient to transmit a single E-DPCCH. To maximize the probability that the E-DPCCH is successfully decoded by the NodeB(s) in the active set it could be transmitted from a virtual antenna that is power controlled and/or with an additional power offset in case of dual stream transmissions. Furthermore, the data transmissions of the different streams could either have one common or HARQ processes or separate HARQ processes.
  • FIG. 12 is a flow diagram illustrating E-DCH transport channel processing including interleaving over virtual antennas according to an embodiment.
  • Fig. 12 illustrates steps 121 -126 which correspond to the coding steps described for single stream transmission described in section 4.8 of the 3GPP standard specification TS 25. 212 V. 10.0.0.
  • Fig. 12 however illustrates a dual stream transmission scenario, where two transport blocks 1 19, associated with different streams, arrive from the MAC layer to L1 .
  • a Cyclic Redundancy Check (CRC) is attached to each transport block 1 19, respectively.
  • CRC Cyclic Redundancy Check
  • step 122 code block segmentation is carried out separately for the different transport blocks 1 19.
  • Channel coding is performed on the transport blocks 1 19 respectively in the step 123, resulting in encoded transport blocks 120.
  • step 124 physical layer HARQ functionality and rate matching in a step 124 and physical channel segmentation in a step 125.
  • Bits of one encoded transport block 120 may be mapped to one or several physical channels in the step 125 depending on whether one or several E-DPDCHs are used per stream.
  • bit interleaving and physical channel mapping is performed. It is to be noted that the bit interleaving in the step 126 is interleaving of bits separately within each physical channel.
  • the bit interleaving in the step 126 is not an interleaving over different virtual antennas.
  • the step 126 results in the physical channels in the form of E-DPDCHs 127.
  • the E-DPDCHs 127 are then interleaved over the virtual antennas in a step 51 , corresponding to the step 51 illustrated in Fig. 5a, which was described above.
  • the step 51 may instead be carried out at another stage of the E-DCH transport channel processing after the step 123.
  • the step 51 may e.g. be carried out on the encoded transport blocks 1 20 after the step 1 23 and prior to the step 1 24 or alternatively in connection with bit interleaving in the step 1 26, such that bit interleaving and interleaving over virtual antennas are combined.
  • the UE additionally informs the network, e.g., NodeB(s) in the active set, when it performs dual-stream transmission by reusing bits in the P-DPCCH or (one of) the E-DPCCH transmitted from the first virtual antenna 17.
  • the physical channels conveying the information regarding whether there is single or dual stream transmission is not time-interleaved.
  • the UE can signal whether or not it transmits two streams in a certain subframe. For single-stream transmissions interleaving across the virtual antennas is undesirable.
  • the Node-B will be aware of whether the UE will transmit one or two streams if the standard stipulates that the UE always should transmit two streams if the network requests dual stream transmission.
  • the UE can be in soft handover. Hence there always exist situations where some of the Node-B(s) in the active set is unaware of whether the UE will transmit one or two streams.
  • the UE will have to transm it two E-DPCCHs. Hence there will be two so-called "happy bits" available whenever dual-stream transmissions take place.
  • the UE uses a happy bit to signal to the network whether or not the UE is satisfied (happy) with the current serving grant. However, for scheduling one of the two happy bits will be sufficient. Consequently one of the two happy bits can be reused for signaling to the network whether single or dual-stream transmission is used.
  • the NodeB(s) could try to detect the other E-DPCCH . If both E-DPCCHs are detected and decoded successfully, the NodeB(s) can perform the E-DPDCH decoding under the assumption that dual- stream transmission has taken place.
  • An alternative way for the UE to signal whether or not it transmits two streams in a certain sub-frame would be to reduce the granularity and/or range of the supported E-TFCIs supported for UEs configured in uplink MIMO mode.
  • Fig. 13 is a schematic block diagram of an exemplary embodiment of the UE 1 1 in Fig. 1 .
  • the UE 1 1 comprises the physical antennas 13 and 14, but the UE 1 1 may also comprise further physical antennas.
  • the UE includes transceiver circuitry 132. Alternatively the transceiver circuitry may be arranged in a separate receiver and a transmitter.
  • the UE 1 1 further comprises digital data processing circuitry 131 which may be embodied as one or more processors, application-specific integrated circu its (ASICs), d ig ital sig nal processors (DSPs) or a combination thereof.
  • the digital data processing circuitry may be adapted to perform processing according to any of the embodiments described above.
  • the digital data processing circuitry 131 is inter alia configured to implement the first and second virtual antennas 1 7, 1 8.
  • the digital data processing circuitry 131 may be configured with d ifferent modu les . I n fig . 1 3, two exem plary mod u les 1 33 and 1 35 are ill ustrated .
  • the modu le 1 33 is a module for virtual antenna interleaving according to one or several of the embodiments described above.
  • the module 1 35 is a module for inner loop power control of one or several of the virtual antennas 17, 1 8.
  • the modules 1 33 and 135 are merely some examples and other modules may be used in alternative embodiments, such as a module for controlling signaling to a network node to inform the network node whether the UE 1 1 uses single or multiple stream transmission.
  • the modules 133 and 135 would generally be program modules implemented in software, although implementations completely or partly in firmware, hardware or combinations thereof are also feasible.
  • Program modules may be comprised in one or several computer program products embodied in the form of a volatile or nonvolatile memory, e.g . a RAM, an EEPROM, a flash memory or a disc drive.
  • the UE 1 1 in Fig . 13 also includes a memory 1 34. In case the modules 133 and 135 are program modules, these may be stored by the memory 134 and executed by the digital data processing circuitry 131 .

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne des procédés et des appareils qui facilitent la commande de la qualité d'une liaison radio de transmissions MIMO en liaison montante. Une différence de qualité entre différents signaux codés est réduite par l'entrelacement des signaux codés sur différentes antennes virtuelles (17, 18) dans un équipement utilisateur. L'entrelacement peut être effectué sur différentes échelles temporelles et à différentes étapes de la procédure de transmission. Selon certains modes de réalisation, les blocs de transport codés (103, 4) sont entrelacés sur les antennes virtuelles (17, 18) pour parvenir à une qualité de liaison radio plus régulière entre les blocs de transport (103, 104). Dans certains modes de réalisation, une transmission de données par couche physique et une retransmission par couche physique de ces mêmes données sont effectuées à partir de différentes antennes virtuelles (17, 18) afin de réduire la différence de qualité entre des données transmises depuis différentes antennes virtuelles.
PCT/SE2011/051193 2011-01-10 2011-10-05 Procédés et appareils pour transmissions mimo en liaison montante WO2012096609A1 (fr)

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EP2712103A1 (fr) * 2012-09-21 2014-03-26 Alcatel Lucent Appareils, procédés et programmes informatiques pour émetteur et décodeur MIMO
WO2017035686A1 (fr) * 2015-08-28 2017-03-09 华为技术有限公司 Procédé, appareil et dispositif de transmission d'informations

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2712103A1 (fr) * 2012-09-21 2014-03-26 Alcatel Lucent Appareils, procédés et programmes informatiques pour émetteur et décodeur MIMO
WO2017035686A1 (fr) * 2015-08-28 2017-03-09 华为技术有限公司 Procédé, appareil et dispositif de transmission d'informations

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