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WO2013068135A1 - Station de base radio, équipement utilisateur et procédés pour l'émission et la réception de données dans un système de radiocommunications - Google Patents

Station de base radio, équipement utilisateur et procédés pour l'émission et la réception de données dans un système de radiocommunications Download PDF

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Publication number
WO2013068135A1
WO2013068135A1 PCT/EP2012/064567 EP2012064567W WO2013068135A1 WO 2013068135 A1 WO2013068135 A1 WO 2013068135A1 EP 2012064567 W EP2012064567 W EP 2012064567W WO 2013068135 A1 WO2013068135 A1 WO 2013068135A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
user equipment
radio base
virtual antenna
data
Prior art date
Application number
PCT/EP2012/064567
Other languages
English (en)
Inventor
Thomas Chapman
Terence Edwin Dodgson
Matthias HESSE
Original Assignee
Nokia Siemens Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Publication of WO2013068135A1 publication Critical patent/WO2013068135A1/fr

Links

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
    • H04B7/0417—Feedback systems
    • 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
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0473—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking constraints in layer or codeword to antenna mapping into account
    • 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
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • 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 present invention relates to transmitting and receiving data in a radio communications system. Particularly, the present invention refers to methods for the transmitting and receiving data; a base station configured to perform the transmitting; and a user equipment configured to perform the receiving .
  • a radio base station or Node B
  • a radio communications system in particular in a High Speed Downlink Packet Access (HSDPA) system, it is important that all available transmit (Tx) antennas transmit with equal power .
  • HSDPA High Speed Downlink Packet Access
  • a current Node B can be of type lTx (Single Input Multiple Output, or SIMO) , 2Tx (2x2 Multiple Input Multiple Output, or 2x2 MIMO) , or 4Tx MIMO, i.e. comprising one, two, or four transmit antennas for transmitting data.
  • SIMO Single Input Multiple Output
  • 2Tx (2x2 Multiple Input Multiple Output, or 2x2 MIMO)
  • 4Tx MIMO i.e. comprising one, two, or four transmit antennas for transmitting data.
  • legacy MIMO user equipments UEs
  • legacy non-MIMO UEs only of one transmit antenna.
  • VAM virtual antenna mapping
  • the signals to be applied to the antennas of a MIMO system are subjected to a further precoding based on the selected precoding vectors.
  • the signal that was originally intended for the first antenna only is transmitted over both antennas and similarly the signal that was intended for the second antenna only is transmitted over both antennas. This allows for the signals intended for the first or second antennas originally to be transmitted with unequal power, whilst the actual transmitted signal is the same at both of the physical antennas.
  • Virtual antenna mapping means the process of mapping a signal for a "virtual" antenna to one or more physical transmit antennas, based on a set of precoding vectors comprised in a precoding matrix, or virtual antenna mapping matrix.
  • the virtual antenna mapping matrix is a fixed matrix which normally never changes.
  • VAM allows the Node B to appear to a UE as if it has fewer Tx antennas than it actually has. By applying VAM, unbalanced power at virtual antenna ports is transformed into balanced power at physical antenna ports.
  • TxAA precoding The precoding applied for TxAA is user and time specific and is referred to as "TxAA precoding”.
  • VAM precoding The second precoding applied for VAM is fixed for all users and time and is referred to as "VAM precoding”.
  • VAM is transparent to terminals, which are not aware of the fixed precoding applied at the base station. Since the pilot channels are also subject to VAM precoding, the terminal views the signal from the "virtual" antennas as if it would have been transmitted from one real antenna. VAM does not cause performance degradation for single antenna or dual stream MIMO users. For single stream 2x2 MIMO users, a restriction in the selection of precoding vectors for TxAA has to be applied.
  • VAM precoding vectors for a 4Tx system that do not interact with Transmit Antenna Array (TxAA) precoding vectors is difficult, and in a real system, it is likely that it would not be possible to derive such vectors without a precoding loss caused by interaction between the VAM and TxAA precoding.
  • TxAA Transmit Antenna Array
  • VAM precoding must be transparent to existing SIMO and MIMO terminals but does not need to be transparent to new 4x2 and 4x1 UEs which can perfectly profit from 4Tx antennas used in 3GPP 4Tx MIMO (also called 4 branch MIMO) .
  • 4Tx MIMO also called 4 branch MIMO
  • Object of the present invention is improving of transmitting and receiving data in a radio communications system.
  • This object is achieved by a method for transmitting data in a radio communications system from a radio base station to a user equipment, the radio base station comprising a number of transmit antennas, wherein data is transmitted via a pilot channel and via a data channel.
  • the method comprises the step of applying, depending on a condition of the user equipment, a virtual antenna mapping to the pilot channel and to the data channel, or to the pilot channel only.
  • condition of the user equipment is further being defined as the user equipment comprising information on the virtual antenna mapping.
  • the number of transmit antennas is four.
  • the method further comprises the step of selecting, prior to said applying, a number of virtual antenna precoding vectors, wherein the number of virtual antenna precoding vectors is equal to the number of transmit antennas
  • the object of the present invention is also achieved by a radio base station for transmitting data in a radio
  • the radio base station comprising a number of transmit antennas; data transmission means configured for transmitting data via a pilot channel and via a data channel; and virtual antenna mapping means configured for applying, depending on a condition of the user equipment, a virtual antenna mapping to the pilot channel and to the data channel or to the pilot channel only.
  • the radio base station further comprises selecting means for selecting a number of virtual antenna precoding vectors, wherein the number of virtual antenna precoding vectors is equal to the number of transmit antennas.
  • the object of the present invention is also achieved by a user equipment for receiving data in a radio communications system from a radio base station. The user equipment
  • said information comprises a virtual antenna mapping matrix used for said virtual antenna mapping.
  • Fig. 1 shows a radio telecommunications system, a radio base station and a user equipment according to the invention
  • Fig. 2 shows an implementation of the present invention according to some embodiments of the present invention
  • Fig. 3 shows an implementation of the present invention according to some embodiments of the present invention
  • Fig. 4 shows an implementation of the present invention according to some embodiments of the present invention
  • Fig. 5 shows an implementation of the present invention according to some embodiments of the present invention
  • Fig. 6 shows an implementation of the present invention according to some embodiments of the present invention.
  • Fig. 7 shows an implementation of the present invention according to some embodiments of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • pilot channel refers to a Common Pilot Indicator Channel (CPICH) , and in particular to a primary Common Pilot Indicator CHannel (P-CPICH) and to secondary common pilot indicator channels (S-CPICH) .
  • data channel refers to a High-Speed Downlink Shared Channel (HS-DSCH) as used in a HSDPA system.
  • HS-DSCH High-Speed Downlink Shared Channel
  • Fig. 1 shows components of a radio telecommunications system according to the invention.
  • Fig. la shows a radio cell in a radio telecommunications system.
  • the radio cell is spanned by a radio base station 11 which serves a user equipment 12.
  • Fig. lb shows the radio base station 11 and the user equipment 12 in more detail:
  • the radio base station 11 comprises a number of transmit antennas 111 and the user equipment comprises a receive antenna 121.
  • the radio base station 11 furthermore comprises data transmission means 112 configured for transmitting data via a pilot channel and via a data channel; and virtual antenna mapping means 113 configured for applying, depending on a condition of the user equipment 12, a virtual antenna mapping to the pilot channel and to the data channel or to the pilot channel only.
  • the radio base station 11 further comprises selecting means 114 for selecting a number of virtual antenna precoding vectors, wherein the number of virtual antenna precoding vectors is equal to the number of transmit antennas 111.
  • the user equipment 12 further comprises data channel receiving means 122 configured for receiving a data channel; and pilot channel receiving means 123 configured for receiving a pilot channel.
  • the pilot channel receiving means comprises information 1231 on a virtual antenna mapping applied to the pilot channel by said radio base station 11.
  • Fig. 2 shows an implementation of the present invention according to some embodiments of the present invention.
  • Fig. 2a shows a method for transmitting data in a radio communications system from a radio base station to a user equipment, the radio base station comprising a number of transmit antennas.
  • Data is transmitted via a pilot channel and via a data channel.
  • the method comprises the step of applying 22, depending on a condition of the user equipment, a virtual antenna mapping to the pilot channel and to the data channel, or to the pilot channel only.
  • condition of the user equipment 12 is further being defined as the user equipment 12 comprising information 1231 on the virtual antenna mapping.
  • a radio base station comprising four transmit antennas and a user equipment comprising any number of receive antenna.
  • An example for such a UE is a UE comprising four receive antennas.
  • Such a UE is also referred to as 4x4 UE .
  • Other examples of UEs comprise one or two receive antennas, i.e. 4x1 or 4x2 UEs.
  • Fig. 2b shows the method as shown in Fig. 2a, the method further comprising the step of selecting 21, prior to said applying 22, a number of virtual antenna precoding vectors, wherein the number of virtual antenna precoding vectors is equal to the number of transmit antennas 111.
  • Each precoding vector relates to a "virtual" antenna.
  • a pilot signal, or pilot is transmitted via a pilot channel from each virtual antenna and precoded with the relevant VAM vector .
  • the HS-DSCH is mapped to the first virtual antenna.
  • the first VAM vector then maps the signal on this first virtual antenna to all four physical radio base station transmit antennas using a fixed precoding vector VI. Since the P-CPICH is precoded with the same weights as the HS-DSCH, the UE is not aware that the VAM precoding has occurred. Furthermore, since the first virtual antenna signal is mapped to all four physical radio base station transmit antennas, the power on each of the physical antennas is equal.
  • the HS-DSCH is precoded to two virtual antennas using the two-weight TxAA precoding codebook Wl .
  • Each of the two virtual antennas is then mapped to four physical radio base station transmit antennas using two VAM precoding vectors.
  • the VAM is transparent.
  • the TxAA precoding is still applied, from the UE perspective TxAA and MIMO operate as in the 3GPP standard specification.
  • 4x4 MIMO UEs are aware of the VAM precoding, as the pilot channel receiving means 123 comprised in the UE 12 comprises information 1231 on the applied virtual antenna mapping.
  • the information 1231 comprises a virtual antenna mapping matrix used for said virtual antenna mapping.
  • 4x4 MIMO UEs can combine the four pilot signals in order to estimate the channel impulse response for each physical antenna.
  • the HS-DSCH for four antenna UEs is mapped directly to the physical antennas using TxAA precoding; no VAM precoding is applied to the HS-DSCH. Power balancing is maintained as the HS-DSCH is mapped to all four antennas. Based on the channel impulse responses from each of the four physical antennas, the UE can combine the antenna channel impulse responses to correctly demodulate the HS-DSCH whenever TxAA precoding is applied.
  • the VAM precoding vectors applied to the pilots and HS-DSCH for SIMO and 2x2 MIMO UEs is a subset of the TxAA precoding codebook for 4x4 MIMO UEs.
  • Fig. 4 shows the concept of the invention when applied to a 2x2 system.
  • an antenna mapping system for SIMO and MIMO schemes is proposed where there can be a mixture of UEs expecting a different number of transmit antennas in which transparent (to the terminals) VAM is applied for UEs receiving from less than the total number of radio base station transmit antennas, whilst UEs that can receive from all of the radio base station transmit antennas are aware of the VAM precoding and where VAM precoding is not applied to the HS-PDSCH for such UEs.
  • the VAM precoding vectors are a subset of the highest antenna order TxAA precoding vectors.
  • Fig. 5 shows a transmission to a SIMO UE .
  • the pilot, control channels and HS-PDSCH are mapped to the first virtual antenna for this UE .
  • the first VAM precoding vector VI maps the signal on the first virtual antenna to the four physical transmit antennas.
  • Fig. 6 shows a transmission to a 2x2 MIMO UE using dual stream.
  • the P-CPICH is transmitted via the first virtual antenna.
  • the first virtual antenna is mapped to the four physical antennas using the first VAM precoding vector VI .
  • the S-CPICH is mapped to the second virtual antenna.
  • the second virtual antenna is mapped to the 4 physical antennas using VAM precoding vector V2.
  • the UE makes channel estimates on the P-CPICH and the S-CPICH. As an advantage, in each case, since the UE receives the combined signal from four antennas, the UE is unaware of the VAM precoding.
  • the TxAA precoding is indicated by the UE in exactly the same manner as without VAM. The UE can use the channel estimates from the P-CPICH and S-CPICH to demodulate the HS-PDSCH.
  • Fig. 7 shows a transmission to a 4x4 MIMO UE using two streams. It should be noted that there is no reason why the UE could not be transmitting four streams, but two stream transmission is depicted for clarity of the diagram.
  • the UE must make channel estimates for each of the four pilots, P- CPICH, S-CPICH, CPICH3 and CPICH4. In this case, the UE is aware of the VAM precoding vectors VI to V4 that have been applied to the pilots. By adding and subtracting the channel estimates from each of the pilots, the UE can get channel estimates from each of the four physical antennas. Then, the UE can select an optimal TxAA precoding vectors Hi from its TxAA vector codebook.
  • the four HS-PDSCH channels are precoded using the selected vectors from the TxAA codebook Hi.
  • the UE must combine its channel estimates relating to each of the physical antennas in order to get channel estimates.
  • 4x4 MIMO UEs must be aware of the applied precoding.
  • the present invention allows for this, as the pilot channel receiving means comprised in the UE comprises information on the applied virtual antenna mapping.
  • a main advantage of the invention is that for UEs that receive from all base station antennas, the HS-DSCHs are mapped directly to the transmit antennas using TxAA pre- coding, without applying VAM. As VAM is costly and time consuming, not applying VAM to the data channels allows for a more efficient data transmission.
  • pilot channels are always pre-coded with VAM, because pilots 1 and 2 have to be VAM pre-coded due to legacy reasons, and mixed channel estimation (from pilots with VAM and pilots without VAM) would be very complicated.
  • TxAA transmit antenna array

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

Abstract

La présente invention se rapporte à l'émission et à la réception de données dans un système de radiocommunications. Elle concerne en particulier des procédés, une station de base radio et un équipement utilisateur pour l'émission et la réception, dans un système de radiocommunications, de données partant d'une station de base radio pour rejoindre un équipement utilisateur. Cette station de base radio comprend plusieurs antennes d'émission. Les données sont émises par le biais d'une voie pilote et d'une voie de données. Ledit procédé consiste à appliquer, en fonction de l'état dudit équipement utilisateur, un mappage d'antenne virtuelle sur la voie pilote et sur la voie de données, ou seulement sur la voie pilote. Selon certains modes de réalisation de la présente invention, l'état de l'équipement utilisateur dépend de la possession, par ledit équipement, d'informations sur le mappage d'antenne virtuelle.
PCT/EP2012/064567 2011-11-08 2012-07-25 Station de base radio, équipement utilisateur et procédés pour l'émission et la réception de données dans un système de radiocommunications WO2013068135A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EPPCT/EP2011/069686 2011-11-08
EP2011069686 2011-11-08

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WO2013068135A1 true WO2013068135A1 (fr) 2013-05-16

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015100670A1 (fr) * 2013-12-31 2015-07-09 华为技术有限公司 Procédé, dispositif et système pour obtenir des informations de canal
EP2958381A4 (fr) * 2013-03-20 2015-12-23 Huawei Tech Co Ltd Procédé, dispositif et système de transmission de données dans une mise en réseau hybride
WO2017035686A1 (fr) * 2015-08-28 2017-03-09 华为技术有限公司 Procédé, appareil et dispositif de transmission d'informations
CN115720102A (zh) * 2021-08-24 2023-02-28 上海华为技术有限公司 一种无线通信方法、相关装置及设备

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2276300A2 (fr) * 2009-07-14 2011-01-19 Vodafone Group PLC Sélection de technologie de transmission pour communications dans des réseaux mobiles étendus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2276300A2 (fr) * 2009-07-14 2011-01-19 Vodafone Group PLC Sélection de technologie de transmission pour communications dans des réseaux mobiles étendus

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
3GPP: "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Base Station (BS) conformance testing (FDD) (Release 10)", 3GPP DRAFT; DRAFT_25141-A30, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG4, 27 September 2011 (2011-09-27), XP050542473 *
NOKIA SIEMENS NETWORKS ET AL: "Standardisation of 4 antenna MIMO for HSPA+", 3GPP DRAFT; R1-113412, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Zhuhai; 20111010, 4 October 2011 (2011-10-04), XP050538463 *
NOKIA SIEMENS NETWORKS: "Integrating power balancing network into 4Tx MIMO", 3GPP DRAFT; R1-120652, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Dresden, Germany; 20110206 - 20110210, 31 January 2012 (2012-01-31), XP050563054 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2958381A4 (fr) * 2013-03-20 2015-12-23 Huawei Tech Co Ltd Procédé, dispositif et système de transmission de données dans une mise en réseau hybride
US9577726B2 (en) 2013-03-20 2017-02-21 Huawei Technologies Co., Ltd. Method, apparatus, and system for sending data in hybrid networking
WO2015100670A1 (fr) * 2013-12-31 2015-07-09 华为技术有限公司 Procédé, dispositif et système pour obtenir des informations de canal
US9900076B2 (en) 2013-12-31 2018-02-20 Huawei Technologies Co., Ltd. Method for acquiring channel information, apparatus, and system
WO2017035686A1 (fr) * 2015-08-28 2017-03-09 华为技术有限公司 Procédé, appareil et dispositif de transmission d'informations
CN115720102A (zh) * 2021-08-24 2023-02-28 上海华为技术有限公司 一种无线通信方法、相关装置及设备

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