WO2011003291A1 - Procédé de sélection d’antenne pour terminal mobile et système - Google Patents

Procédé de sélection d’antenne pour terminal mobile et système Download PDF

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Publication number
WO2011003291A1
WO2011003291A1 PCT/CN2010/071777 CN2010071777W WO2011003291A1 WO 2011003291 A1 WO2011003291 A1 WO 2011003291A1 CN 2010071777 W CN2010071777 W CN 2010071777W WO 2011003291 A1 WO2011003291 A1 WO 2011003291A1
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WO
WIPO (PCT)
Prior art keywords
antenna
channel quality
uplink channel
uplink
enodeb
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PCT/CN2010/071777
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English (en)
Chinese (zh)
Inventor
支周
于辉
魏巍
郭阳
卢忱
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中兴通讯股份有限公司
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Publication of WO2011003291A1 publication Critical patent/WO2011003291A1/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
    • H04B7/06—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
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to an antenna selection method and apparatus for a mobile terminal. Background technique
  • Orthogonal Frequency Division Multiplexing is one of the core technologies in the fourth generation of mobile communication, which is essentially a multi-carrier modulation communication technology.
  • MIMO Multi-Input Multi-Output
  • MIMO Multi-Input Multi-Output
  • B3G and 4G mobile communication systems can increase system capacity, improve transmission performance, and integrate well with other physical layer technologies, thus becoming a key technology for B3G and 4G mobile communication systems.
  • the channel correlation is strong, the diversity gain and multiplexing gain caused by the multipath channel are greatly reduced, resulting in a significant degradation of the performance of the MIMO system.
  • the system throughput gain is also brought about, the hardware and signal processing complexity is increased, the transceiver size is increased, and more RF circuits, frequency down converters, beam converters, etc. are required.
  • the selection of the transmitting antenna is to judge the channel state information, and the antenna selection technique selects an antenna with a better channel state (acceptable) to transmit the corresponding service signal, and the antenna with other channel state is not good (cannot be accepted) is turned off or only Used to send pilots without sending traffic signals. In the worst case, at least one antenna can be guaranteed to work normally to keep the link of the communication system unblocked. Especially for power sensitive devices such as terminals, antenna selection has more important significance.
  • the RF circuit is an important part of the cost of the mobile terminal/User Equipment (UE). Through the antenna selection technology, the number of amplifiers can be reduced, and the cost of the UE can be reduced. Low power consumption and reduced complexity.
  • the UE transmits a reference measurement signal on the uplink antenna, and the reference measurement signal transmitted by the LTE uplink includes a Demodulation Reference Signal (DM RS) and a Sounding Refrence Signal (SRS), and arranges the SRS in a suitable position.
  • DM RS Demodulation Reference Signal
  • SRS Sounding Refrence Signal
  • the eNodeB learns the uplink channel information according to the uplink pilot, and then determines and notifies the UE to select the corresponding antenna with good channel quality.
  • the UE has two transmit antennas, one PA (power amplifier), and the PA is alternately transmitted through two antennas.
  • This has the advantage of avoiding long-term fading of the signal, and selecting spatial channels of different qualities, increasing the uplink transmit gain, and saving the manufacturing cost of the UE and improving the power-saving performance of the terminal.
  • the antenna selection execution process is: the UE transmits the uplink SRS, and alternately transmits on the two antennas according to the specification, and the eNodeB estimates the uplink channel quality of the two antennas according to the received SRS signal, and then the eNodeB is implicitly (through 36.212 8605.3. 3.2 CRC attachment ) informs the UE to select a good antenna to transmit.
  • the uplink supports up to 4 antennas. This may configure 4 PAs or 2 PAs in the terminal, 4 antennas for reception when receiving, and 4 PAs for transmission when transmitting. Or 2 PAs are sent, but the antenna selection is not clearly defined in the existing LTE-A protocol version. Summary of the invention
  • the main object of the present invention is to provide an antenna selection method and apparatus for a mobile terminal, which are used to solve the technical problem of how the user equipment performs antenna selection in the LTE-A system.
  • An antenna selection method for a mobile terminal comprising: The enhanced base station eNodeB estimates the uplink channel quality of each antenna according to the reported uplink reference measurement signal, determines the antenna packet with the best uplink channel quality, and notifies the UE of the decision result;
  • the UE selects the corresponding antenna packet for transmission according to the decision of the eNodeB.
  • the antenna group is a fixed packet
  • the eNodeB estimates the uplink channel quality of each antenna group in units of fixed antenna packets, and determines that the antenna packet with the best uplink channel quality is notified to the UE.
  • the antenna packet includes two fixed antenna packets, and the uplink reference measurement signals of the two antenna packets are reported to the eNodeB in two consecutive subframes respectively; the eNodeB estimates the uplink channel quality of each antenna packet separately, After the uplink channel quality estimation of the second antenna group is completed, the uplink channel quality evaluation results of the two antenna groups are compared, and the antenna packet with the best uplink channel quality is selected and notified to the UE.
  • the antenna packet includes two fixed antenna packets, and the uplink reference measurement signals of the two antenna packets are respectively reported to the eNodeB on different time slots of the same subframe; the eNodeB receives two antenna packets in the same subframe.
  • the uplink reference measurement signal After the uplink reference measurement signal, the uplink channel quality of each antenna group is estimated, and the uplink channel quality evaluation results of the two antenna groups are compared, and the antenna packet with the best uplink channel quality is selected and notified to the UE.
  • the antenna group is a non-fixed packet, and the system indicates different combinations of antenna packets by adding new downlink control information; after receiving the uplink reference measurement signal reported by each antenna packet, the eNodeB separately uplinks each antenna The channel quality is estimated, and then the uplink channel quality of each antenna is sorted, and the antenna with the best uplink channel quality is selected to form a new antenna packet, and the determined new antenna packet is notified to the mobile by the added downlink control information. terminal.
  • the antenna packet includes two non-fixed antenna packets, and the uplink reference measurement signals of the two antenna packets are respectively in two consecutive subframes or respectively in the same subframe.
  • the time slot is reported to the eNodeB.
  • the present invention further provides a mobile terminal antenna selection system based on the above method, and the technical solution of the present invention is implemented as follows:
  • a mobile terminal antenna selection system includes:
  • a grouping unit located at the UE end, for initial grouping the uplink antennas
  • a measurement reporting unit located at the UE, configured to map an uplink reference measurement signal into each subframe in units of antenna packets;
  • Selecting a transmitting unit located at the UE end, for selecting a corresponding antenna to transmit according to the antenna group determined by the grouping unit or the channel notifying unit;
  • the uplink channel quality estimation unit is located at the eNodeB, and is configured to estimate an uplink channel quality of each antenna according to the uplink reference measurement signal reported by the measurement reporting unit, and determine an antenna packet with the best uplink channel quality;
  • the channel notification unit located at the eNodeB, is configured to notify the UE of the antenna packet with the best uplink channel quality determined by the eNodeB.
  • the antenna group is a fixed packet
  • the uplink channel quality estimation unit estimates an uplink channel quality of each antenna group in units of fixed antenna packets, and determines an uplink channel quality of the eNodeB by using a channel notification unit.
  • the antenna group is notified to the UE.
  • the UE includes two fixed antenna packets, and the measurement reporting unit maps the uplink reference measurement signals on two consecutive subframes or on different time slots of the same subframe through two antenna groups to the eNodeB.
  • the antenna grouping is a non-fixed packet, and the system indicates different combinations of antenna packets by adding new downlink control information; the uplink channel quality estimating unit separately estimates the uplink channel quality of each antenna, and then for each antenna. The uplink channel quality is sorted, and the antenna with the best uplink channel quality is selected to form a new antenna packet, and the channel notification unit notifies the UE of the new antenna packet by the added downlink control information. Further, the UE includes two non-fixed antenna packets, and the measurement reporting unit reports the uplink reference measurement signal to the eNodeB through two antenna packets on two consecutive subframes or different time slots of the same subframe.
  • the present invention also proposes a mobile terminal antenna selection method in a scenario in which channel reciprocity is available in a time division duplex system, and the technical solution of the present invention is implemented as follows:
  • a method for selecting an antenna of a mobile terminal includes the steps of:
  • the eNodeB sends a downlink reference measurement signal to the UE, and the UE receives the downlink reference measurement signal; the UE estimates the downlink channel quality according to the downlink reference measurement signal, and infers the uplink channel quality based on the channel reciprocity;
  • the UE selects an antenna packet with better uplink channel quality for transmission based on the inferred uplink channel quality autonomous decision.
  • the present invention further provides a mobile terminal antenna selection system, including:
  • a downlink reference measurement signal sending module located at the eNodeB end, configured to send a downlink reference measurement signal to the UE;
  • An uplink channel quality inference module located at the UE end, is configured to estimate a downlink channel quality according to the downlink reference measurement signal, and infer an uplink channel quality;
  • the decision module is located at the UE end for selecting an antenna packet having a better uplink channel quality according to the inferred uplink channel quality autonomous decision.
  • the present invention considers the power saving of the terminal and the cost problem, and groups the four antennas or sorts the channel quality estimation results thereof, thereby selecting one set or two antennas with the best channel quality estimation for transmission, and the present invention can
  • the antenna selection signaling in the LTE release 8 is extended, and the modification to the system is small, and the signaling overhead is small.
  • the present invention can also support flexible antenna grouping by increasing DCI, thereby improving sensitivity to channel quality and enhancing transmission performance.
  • the invention can also avoid long-term fading, obtain diversity gain, and reduce cost.
  • FIG. 1 is a schematic diagram of a method for assisting a UE to perform antenna selection by using an eNodeB according to the present invention
  • FIG. 2 is an antenna selection process for reusing LTE release 8 antenna selection signaling indication in an FDD mode;
  • Figure 4 shows the flow of the antenna selection by the terminal by adding a new DCI in the FDD mode
  • FIG. 5 is a schematic diagram of an uplink reference measurement signal for transmitting each antenna group in different time slots in the same subframe on four antennas according to the present invention
  • FIG. 6 is a schematic diagram of antenna selection by using channel reciprocity in the TDD mode of the present invention
  • FIG. 7 is a flowchart of autonomous antenna selection based on channel reciprocity in the TDD mode of the present invention
  • FIG. 8 is a channel that cannot be utilized in the TDD mode of the present invention
  • FIG. 9 is a logic structural diagram of a mobile terminal antenna selection system according to the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described in detail below with reference to the accompanying drawings.
  • the schematic diagram of the antenna selection method that needs to be implemented by the eNodeB is shown in Figure 1.
  • the main process is: The UE sends a measurement signal to the eNodeB, and the eNodeB estimates the uplink channel quality according to the uplink reference measurement signal, and the decision is made. The UE is then notified of the result, and the UE transmits the channel with better channel quality according to the decision result.
  • Example 1 The following implementation has four transmit antennas at the transmitting end, and two PAs are taken as an example. However, in the case that the UE has more transmit antennas, the idea of antenna grouping can still be considered, thereby saving control signaling overhead.
  • Example 1 the idea of antenna grouping can still be considered, thereby saving control signaling overhead.
  • the UE is in the FDD mode.
  • the embodiment uses the LTE release8 antenna selection signaling to instruct the terminal to select the antenna group with the corresponding channel quality for combined transmission. As shown in FIG. 2, the specific steps are as follows:
  • Step 201 Perform grouping on uplink transmit antennas of the UE.
  • Grouping the antennas may be based on certain set principles, for example, based on antenna correlation, capacity, and the like.
  • the antenna correlation principle is adopted, and the uplink antennas of the UE are grouped, and two antennas with less correlation are selected as a group, and two groups are used.
  • the packets in this embodiment are fixed packets, and each subframe is in each subframe.
  • the two antennas of a group are always transmitted and received as a whole.
  • Step 202 Send an uplink reference measurement signal to the eNodeB in units of antenna groups in each subframe according to the antenna grouping.
  • the uplink reference measurement signals may be transmitted on a group of antennas in each subframe or the uplink reference measurement signals of the respective antenna groups may be separately transmitted in different time slots in each subframe.
  • T1, ⁇ 2, ⁇ 3, ⁇ 4, ⁇ 5 respectively represent one subframe
  • Txl, Tx2, ⁇ 3, ⁇ 4 respectively represent four transmitting antennas
  • the UE includes two sets of radio frequency units, and at the same time, two antennas can be allowed to be transmitted.
  • four antennas are grouped into (Txl, Tx3), ( ⁇ 2, ⁇ 4), and the radio unit can be switched between two sets of transmitting antennas (Txl, Tx3) ( ⁇ 2, ⁇ 4) by switching.
  • the uplink reference measurement signal and data are transmitted on (Tx1, Tx3), and in the ⁇ 2 subframe, one time slot is switched to ( ⁇ 2, ⁇ 4) to transmit the uplink reference measurement signal.
  • the eNodeB compares the uplink channel quality estimation results of the two antenna groups in the T2 subframe, and then selects a group of antenna groups with better uplink channel quality estimation results to notify the UE, and the eNodeB delays to use the newly selected antenna in the next subframe.
  • the method is characterized in that a fixed antenna grouping is used, since an uplink reference measurement signal is sent by selecting a group of antennas in each time slot. No.
  • the LTE Release 8 control signaling can be used to directly notify the UE of the selected antenna group, which has less modification to the existing system and less occupied channel resources.
  • Step 203 The eNodeB estimates channel quality of the two groups of antennas according to the latest uplink reference measurement signals of the two groups of antennas, and determines, according to the estimation result, which antenna group has better channel quality.
  • Step 204 The eNodeB uses the LTE release8 mode to notify the UE to select an antenna group with a corresponding good channel quality to transmit in the next subframe according to the judgment result.
  • Step 205 After receiving the notification of the eNodeB received by the UE, select the corresponding antenna group to transmit according to the instruction of the eNodeB.
  • the non-stationary packet mode may be adopted.
  • the uplink reference measurement signals of the two antennas are reported each time according to the initial packet, and the eNodeB performs channel quality estimation. And selecting two antennas with good channel quality from the four antennas to form a group, and notifying the corresponding antenna group to the UE by using control signaling, and the UE transmitting the uplink reference measurement signal on the newly determined antenna group of the eNodeB in the next subframe, In the next sub-frame, the other two antennas transmit the uplink reference measurement signal, and so on, and the loop is executed.
  • the antenna selection is implemented by adding new downlink control information (Downlink Control Information, DCI), that is, adding six states of antenna selection indication information.
  • DCI Downlink Control Information
  • FIG. 4 the specific process is as follows:
  • Step 401 Perform grouping on uplink transmit antennas of the UE.
  • the non-stationary grouping mode is adopted, and the antenna selection instruction information of the six states is added to indicate which two antennas are specifically selected for transmission.
  • Step 403 The eNodeB estimates, according to the received uplink reference measurement signal, in each subframe. Uplink channel quality; sorting four antennas according to the estimation result;
  • Step 404 The eNodeB comprehensively determines, according to the sorting result, which two antennas have higher quality of the transmitting antenna, and notifies the UE by using the antenna selection indication information;
  • Step 405 The UE selects a corresponding transmit antenna according to the antenna selection indication information.
  • the selection determining process of the antenna in each subframe is as shown in FIG. 5, T1, ⁇ 2, ⁇ 3, ⁇ 4, ⁇ 5 respectively represent one subframe, and Txl, ⁇ 2, ⁇ 3, ⁇ 4 respectively represent four transmitting antennas.
  • the UE includes two sets of radio frequency units, and at the same time, two antennas can be allowed to transmit.
  • (Txl, Tx3) is taken as a group
  • ( ⁇ 2, ⁇ 4) is taken as a group
  • the respective uplink reference measurement signals are respectively transmitted on the four antennas of the two sets of antennas in units of antenna groups, and it is assumed that in the ⁇ 2 subframe, the eNodeB estimates the uplink channel quality of each antenna according to the received uplink reference measurement signal, and according to The estimation result sorts the four antennas, and the result of the ranking is that the uplink channel quality of Tx2 and ⁇ 3 is the best, and the eNodeB notifies the UE by the antenna selection indication information.
  • the UE Since the notification process requires a certain delay, the UE is in the T4 subframe, according to The indication of the antenna selection indication information selects a new antenna group (Tx2, ⁇ 3) for uplink reference measurement signal and data transmission, And in the different time slots of the same subframe, the uplink reference measurement signals of the other two antennas are transmitted on the other two antennas, and so on, and executed cyclically.
  • the feature of this method is that the antenna selection is better in real-time, but the occupied channel resources are more than in the case of fixed packets.
  • the embodiment may also adopt a fixed grouping manner, and the eNodeB performs uplink channel quality evaluation based on the antenna group, and selects a group of antennas with better quality to notify the UE, and if the fixed grouping is used, the new DCI may not be added.
  • the control antenna of the LTE Release 8 can be directly used to notify the UE of the selected antenna group, which has less modification to the existing system and less occupied channel resources.
  • a schematic diagram of implementing the antenna selection method is shown in FIG. 6.
  • the UE estimates the downlink channel quality according to the received downlink reference symbols, according to the TDD channel reciprocity. Characteristic, infer the channel quality of the uplink transmit antenna The situation, and based on certain criteria, capacity, antenna correlation, etc., make a final decision. Such a process can be completed on the UE side without the need for eNodeB assistance.
  • the TDD mode UE is based on the reciprocity autonomous antenna selection process, as shown in FIG. 7: Step 701: The eNodeB sends a downlink reference measurement signal to the UE, and the UE receives the downlink reference measurement signal.
  • Step 702 The UE estimates the downlink channel quality by using a channel reciprocity characteristic of the TDD system, and infers the uplink channel quality.
  • Step 703 The UE autonomously decides to select an antenna packet with better uplink channel quality for transmission.
  • the uplink channel measurement can be implemented in a similar manner to FDD.
  • One option is to consider the uplink four antennas as two antenna packets. For such antenna selection, the antenna signaling mode of the LTE release 8 can be reused, so that no change is required for the LTE release 8 downlink signaling.
  • Another option is that the eNodeB estimates the channel quality of the four transmit antennas, and selects the best of the two channels. The UE is signaled to the UE. This method requires new DCI format support, which supports more freedom. Uplink antenna selection mode.
  • This embodiment is a flow for performing antenna selection in a scenario in which channel reciprocity cannot be utilized in the TDD mode.
  • a new DCI format is added, that is, antenna selection indication information of 6 states is added to notify the UE which two The antenna channel quality is the best.
  • the specific antenna selection is shown in flowchart 8. The steps are as follows:
  • Step 801 Packet the uplink transmit antenna of the UE.
  • Step 802 Send an uplink reference measurement signal on two antennas in each subframe.
  • Step 803 Send an uplink reference on two unused antennas on two slots of the next subframe. Measuring signal
  • Step 804 The eNodeB estimates an uplink channel according to the received uplink reference measurement signal, and sorts the four antenna transmission qualities according to the measured uplink channel result.
  • Step 805 The eNodeB comprehensively determines, according to the judgment result, which two antennas have higher quality of the transmitting antenna, and notifies the UE to select two antennas of the four antennas as the next subframe transmitting antenna by using the antenna selection indication information;
  • Step 806 The UE receives the eNodeB notification, and selects a corresponding transmit antenna according to the eNodeB decision.
  • 9 is a schematic diagram of a logical structure of a mobile terminal antenna selection system according to the present invention, including a UE end and an enhanced base station, where the UE includes: a packet unit, a measurement reporting unit, and a selective transmitting unit; and the enhanced base station includes an uplink channel quality estimating unit and a channel notification. unit.
  • the grouping unit is configured to perform initial grouping on the uplink antenna;
  • the measurement reporting unit is configured to map the uplink reference measurement signal into each subframe in units of antenna packets; and select the transmitting unit to select the antenna group determined according to the grouping unit or the channel notification unit
  • the corresponding antenna is used for transmitting;
  • the uplink channel quality estimating unit is configured to estimate the uplink channel quality of each antenna according to the uplink reference measurement signal reported by the measurement reporting unit, and determine an antenna packet with the best uplink channel quality;
  • the channel notification unit is used for Notifying the UE of the best antenna packet of the uplink channel quality decided by the eNodeB.

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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 concerne un procédé de sélection d’antenne pour terminal mobile et un système qui sont utilisés pour résoudre le problème technique de sélection d’antenne dans l’édition de protocole LTE-A. En prenant les économies d’énergie et le coût du terminal en compte, le procédé de la présente invention divise 4 antennes en groupes, et ordonne les antennes selon des résultats de leurs estimations de qualité de canal, sélectionne par conséquent un groupe de deux antennes avec la meilleure estimation de qualité de canal pour la transmission. La présente invention peut utiliser la signalisation de sélection d’antenne de l’édition de protocole LTE-A version 8, modifier un peu le système, et le surdébit de signalisation est faible. La présente invention peut également supporter un mode de groupement d’antennes flexible en ajoutant des informations de commande de liaison descendante (DCI), perfectionnant ainsi la sensibilité de qualité de canal et les performances de transmission.
PCT/CN2010/071777 2009-07-08 2010-04-14 Procédé de sélection d’antenne pour terminal mobile et système WO2011003291A1 (fr)

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CN2009100882097A CN101944940A (zh) 2009-07-08 2009-07-08 一种移动终端的天线选择方法及装置
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CN101291475A (zh) * 2007-04-18 2008-10-22 展讯通信（上海）有限公司 用于时分双工无线通信系统的移动台及其天线选择方法
CN101345566A (zh) * 2007-07-13 2009-01-14 三菱电机株式会社 在ofdma无线网络中选择天线的方法
CN101436892A (zh) * 2007-08-06 2009-05-20 三菱电机株式会社 在无线网络中选择天线的方法

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US9353225B2 (en) 2013-08-23 2016-05-31 Evonik Degussa Gmbh Compounds having guanidine groups and containing semi-organic silicon groups
WO2018171803A1 (fr) * 2017-03-24 2018-09-27 Mediatek Inc. Acquisition de csi avec réciprocité de canal dans des communications mobiles
US10560169B2 (en) 2017-03-24 2020-02-11 Mediatek Inc. CSI acquisition with channel reciprocity in mobile communications

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