WO2017014557A1 - Procédé, dispositif et système de commutation entre des modes d'émission pour un terminal - Google Patents

Procédé, dispositif et système de commutation entre des modes d'émission pour un terminal Download PDF

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Publication number
WO2017014557A1
WO2017014557A1 PCT/KR2016/007902 KR2016007902W WO2017014557A1 WO 2017014557 A1 WO2017014557 A1 WO 2017014557A1 KR 2016007902 W KR2016007902 W KR 2016007902W WO 2017014557 A1 WO2017014557 A1 WO 2017014557A1
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WIPO (PCT)
Prior art keywords
transmission mode
terminal
transmission
base station
transmission modes
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PCT/KR2016/007902
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English (en)
Inventor
Junwei Ren
Tiezhu Zhao
Hong Wang
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Samsung Electronics Co., Ltd.
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Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Publication of WO2017014557A1 publication Critical patent/WO2017014557A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the present invention relates to a wireless communication system and in particular to a method, device and system for switching between transmission modes for a terminal.
  • An LTE base station informs a terminal by transmission mode (TM) of the used multi-antenna technologies, including single-antenna transmission (single-antenna port scheme), transmit diversity, open-loop spatial multiplexing (large delay CDD scheme), closed-loop spatial multiplexing, multi-user MIMO, and beamforming (single-layer BF, dual-layer BF, up to 8-layer transmission).
  • TM transmission mode
  • single-antenna transmission single-antenna transmission
  • transmit diversity open-loop spatial multiplexing (large delay CDD scheme)
  • closed-loop spatial multiplexing multi-user MIMO
  • beamforming single-layer BF, dual-layer BF, up to 8-layer transmission.
  • Table 1 shows a specific application scenario and a corresponding transmission mode of each multi-antenna technology.
  • Table 1 Type of multi-antenna technologies (MIMO type)
  • Single-antenna transmission Mainly applied to single-antenna transmission occasions Transmit diversity Suitable for cases with complex cell edge channels and heavy interference; and also suitable for cases with high speed; diversity can provide a diversity gain Open-loop spatial multiplexing Suitable for a case in which the terminal moves at a high speed closed-loop spatial multiplexing Suitable for cell edge channels; and suitable for a case in which the terminal moves at a low speed Multi-user MIMO Suitable for cell central channels, and mainly for increasing the capacity of a cell Single-layer beamforming Also mainly suitable for cell edges, capable of resisting against interference effectively, and suitable for a case in which the terminal moves at a low speed
  • each terminal in an LTE cell may experience different wireless channel environments, for example, moving at a high speed, moving at a low speed, cell edges, cell center, non-line-of-sight (NLOS) transmission of wireless signals, line-of-sight (LOS) transmission of wireless signals or more. Therefore, in order to increase the average throughput of a cell, it is required to configure a variety of multi-antenna technologies for each LTE cell. For this reason, it is specified in 3GPP that each transmission mode contains two multi-antenna technologies: transmit diversity and another multi-antenna technology, as shown in Table 2 which shows the correspondence between a transmission mode and multi-antenna technologies.
  • DCI Downlink Control Information
  • PDSCH physical downlink shared channel
  • PDCCH physical downlink control channel
  • DCI format 1A Single-antenna transmission
  • port 0 DCI format 1 Single-antenna transmission port 0 Mode 2
  • DCI format 1A Transmit diversity
  • Transmit diversity Mode 3 DCI format 1A
  • Open-loop spatial multiplexing Mode 4 DCI format 1A
  • DCI format 1A Transmit diversity DCI format 1D Multi-user MIMO Mode 6
  • DCI format 1A Transmit diversity DCI format 1B Closed-loop spatial multiplexing using single-antenna transmission
  • Mode 7 DCI format 1A Transmit diversity DCI format 1 Single-antenna transmission
  • port 5 suitable for beamforming Mode 8
  • DCI format 1A Single-antenna transmission DCI format 2B Dual-layer beamforming, ports 7 and 8; or, single-layer beamforming
  • the two multi-antenna technologies can be implemented in an intra-transmission-mode switchover method in which a terminal is quickly informed of which multi-antenna technology is being used in the current service channel, by the DCI format borne in the PDCCH, rather than by a radio resource control (RRC) signaling.
  • RRC radio resource control
  • a base station when a terminal is located in the center of an LTE cell where the wireless channel conditions are good and the open-loop spatial multiplexing technology is used for increasing the throughput of the terminal, a base station indicates, by the DCI format borne in the PDCCH being DCI format 2A, to the terminal that the current service channel uses the open-loop spatial multiplexing technology; and when the terminal is located at the edge of the LTE cell where the wireless channel quality is poor and it is necessary to use the transmit diversity technology to ensure the reliability of service transmission of the terminal, the base station indicates, by the DCI format borne in the PDCCH being DCI format 1A, to the terminal that the current service channel uses the transmit diversity.
  • DMRSs DeModulation Reference Signals
  • Fig. 1 is a schematic view of distribution of DMRSs and CRSs in one physical resource block of Transmission Mode 7 of the multi-antenna technologies in the prior art, where R 0 represents CRS and R 5 represents DMRS. It can be seen from Fig. 1 that, due to the introduction of DMRSs, a certain extra overhead will be caused, leading to reduced downlink physical resources which actually bear service data.
  • Table 3 shows the downlink physical resource overhead caused by DMRSs in each transmission mode.
  • Fig. 2 is a schematic view showing channel performance curves of a terminal when moving at a speed of 3 km/h in a Transmission Mode 3 and Transmission Mode 9 in the prior art, wherein the upper curve behind the intersection point represents Transmission Mode 3 based on CRS demodulation. The lower curve represents Transmission Mode 9 based on DMRS demodulation. It can be seen from Fig.
  • an LTE base station configures only one transmission mode for each terminal, it is unable to ensure the optimal throughput performance.
  • a common method is to configure a most suitable transmission mode according to the wireless channel conditions of each terminal.
  • each terminal can use only one transmission mode at a time. This requires self-adaptive switchover between transmission modes.
  • the self-adaptive switchover between transmission modes the throughput performance of a cell can be increased to some extent.
  • Fig. 3 is a schematic view showing throughput performance curves of a cell which is self-adaptively switched between Transmission Mode 3 and Transmission Mode 9 in the prior art.
  • the self-adaptive switchover point is the intersection point, curves above the intersection point are a curve of Transmission Mode 3 and a curve of Transmission Mode 9 after this switchover, and the lower one of the two curves represents Transmission Mode 9; and the lower curve prior to the intersection point is a curve of Transmission Mode 3.
  • the self-adaptive switchover between Transmission Mode 3 and Transmission Mode 9 increase greatly the resulting performance gain.
  • switchover between transmission modes is decided, configured and executed by a base station.
  • an LTE base station decides an optimal transmission mode suitable for the transmission of service data of a terminal, according to an uplink signal fed back by the terminal, for example, a sounding reference signal (SRS), a channel quality indicator (CQI), a DMRS borne in a physical uplink shared channel (PUSCH) or more, and configures the determined optimal transmission mode to the terminal by an RRC signaling.
  • SRS sounding reference signal
  • CQI channel quality indicator
  • DMRS borne in a physical uplink shared channel (PUSCH) or more configures the determined optimal transmission mode to the terminal by an RRC signaling.
  • the LTE base station determines whether to trigger the switchover between transmission modes by comparing a CQI fed back by the terminal and a set threshold. This method will be introduced in detail by taking the switchover between Transmission Mode 3 and Transmission Mode 9 as an example.
  • the base station when the base station receives a CQI value higher than the set CQI_TM39_Th, the base station determines that the throughput performance of Transmission Mode 3 is better than that of Transmission Mode 9, and in this case, the base station configures Transmission Mode 3 as the transmission mode of the terminal;
  • the base station when the base station receives a CQI value lower than the set CQI_TM39_Th, the base station determines that the throughput performance of Transmission Mode 9 is better than that of Transmission Mode 3, and in this case, the base station configures Transmission Mode 9 as the transmission mode of the terminal.
  • Fig. 4 is a schematic view showing cell throughput performance curves determined by a switchover threshold between Transmission Mode 3 and Transmission Mode 9 in the prior art, wherein the intersection point is the switchover threshold.
  • FIG. 5 is a schematic view showing cell throughput performance curves when a terminal is switched between Transmission Mode 3 and Transmission Mode 9 while moving at a speed of 90 km/h.
  • the upper curve behind the intersection point represents Transmission Mode 3
  • the lower curve represents Transmission Mode 9.
  • the bottom view shows the expected curved.
  • the performance of Transmission Mode 3 is far better than that of Transmission Mode 9.
  • Fig. 6 is a schematic view showing throughput performance curves of an LTE cell after being subject to switchover between transmission modes by use of an inappropriate threshold in the prior art, wherein the upper curve behind the intersection point represents Transmission Mode 3 based on CRS demodulation, and the lower curve represents a curve of switchover between Transmission Mode 3 and Transmission Mode 9. It can be seen from this figure that, after switchover between transmission modes is performed by use of an inappropriate threshold, the throughput performance of the LTE cell is significantly decreased when compared with a case using a single transmission mode.
  • Fig. 7 is a schematic view of setting a threshold of switchover between transmission modes according to different moving speeds of a terminal in the prior art.
  • a threshold of switchover between transmission modes according to different moving speeds of a terminal in the prior art.
  • method 1 according to the correlation of the uplink signal, for example, Doppler shift effect or more;
  • method 2 obtaining the moving speed of a terminal by the relation between the CQI fed back by the terminal and the actual modulation way of the service channel; and
  • method 3 deciding the moving speed of a terminal by the magnitude of change in the CQI fed back by the terminal.
  • Method 1 the transmit interval of the uplink signal is strictly required, and the existing simulation results show that it is unable to decide the moving speed of a terminal if the transmit interval of the uplink signal exceeds 5 ms.
  • Method 2 is highly related to the degree of interference with neighboring cells: different degrees of interference with neighboring cells will make the relation between the CQI fed back by the terminal and the actual modulation way of the service channel vary, and as a result, the estimation of the moving speed of the terminal is inaccurate; and furthermore, this method is related to the chip type of a terminal: for different chip types, there are different relations between the CQI fed back by the terminal and the actual modulation way of the service channel, and unfortunately, the base station is unable to know the chip type of a terminal.
  • Method 3 is related to the chip type of a terminal.
  • an embodiment of the present invention provides a method for switching between transmission modes for a terminal. This method can enable a base station to accurately determine the optimal transmission mode of a terminal, thereby improving the throughput performance of an LTE cell.
  • the embodiment of the present invention further provides a device for switching between transmission modes for a terminal.
  • This device can enable a base station to accurately determine the optimal transmission mode of a terminal, thereby improving the throughput performance of an LTE cell.
  • a method for switching between transmission modes for a terminal including:
  • a method for switching between transmission modes for a terminal including:
  • a system for switching between transmission modes for a terminal including: a base station and a terminal, wherein
  • the base station is configured to send a set of transmission modes to the terminal, and configure a transmission mode for the terminal according to information about a transmission mode having optimal performance received from the terminal;
  • the terminal is configured to receive the set of transmission modes sent by the base station, measure performance of each transmission mode in the set of transmission modes, respectively, to obtain and send to the base station, information about a transmission mode having optimal performance, and to set a transmission mode according to configuration indication of the base station to communicate with the base station.
  • a device for switching between transmission modes in a base station including a set determination module, a transceiving module and a configuration module, wherein
  • the set determination module is configured to determine a set of transmission modes
  • the configuration module is configured to configure a transmission mode for a terminal according to information about a transmission mode having optimal performance
  • the transceiving module is configured to send the set of transmission modes to the terminal; and to receive the information about a transmission mode having optimal performance from the terminal.
  • a device for switching between transmission modes in a terminal including a transceiving module, a measurement module and a configuration module, wherein
  • the transceiving module is configured to receive a set of transmission modes, send information about a transmission mode having optimal performance to a base station, and receive transmission mode configuration indication from the base station;
  • the measurement module is configured to measure performance of each transmission mode in the set of transmission modes, respectively, to obtain the information about a transmission mode having optimal performance
  • the configuration module is configured to set a transmission mode according to the transmission mode configuration indication of the base station.
  • a base station sends a set of transmission modes to a terminal, and after receiving information about a transmission mode having optimal performance in the set of transmission modes sent by the terminal, the base station configures a transmission mode for the terminal according to the information about this transmission mode.
  • This transmission mode having optimal performance is obtained by measuring each transmission mode in the set of transmission modes by the terminal, respectively.
  • the base station since the transmission mode configured for a terminal is determined according to information about a transmission mode having optimal performance fed back by the terminal, the base station accurately determines an optimal transmission mode for the terminal, thereby improving the throughput performance of an LTE cell.
  • An embodiment of the present invention provides a method for switching between transmission modes for a terminal. This method can enable a base station to accurately determine the optimal transmission mode of a terminal, thereby improving the throughput performance of an LTE cell.
  • the embodiment of the present invention further provides a device for switching between transmission modes for a terminal.
  • This device can enable a base station to accurately determine the optimal transmission mode of a terminal, thereby improving the throughput performance of an LTE cell.
  • Fig. 1 is a schematic view of distribution of DMRSs and CRSs in one physical resource block in Transmission Mode 7 of the multi-antenna technologies in the prior art;
  • Fig. 2 is a schematic view showing channel performance curves of a terminal when moving at a speed of 3 km/h in a Transmission Mode 3 and Transmission Mode 9 in the prior art;
  • Fig. 3 is a schematic view showing throughput performance curves of a cell which is self-adaptively switched between Transmission Mode 3 and Transmission Mode 9 in the prior art;
  • Fig. 4 is a schematic view showing cell throughput performance curves determined by a switchover threshold between Transmission Mode 3 and Transmission Mode 9 in the prior art
  • Fig. 5 is a schematic view showing cell throughput performance curves when a terminal is switched between Transmission Mode 3 and Transmission Mode 9 while moving at a speed of 90 km/h;
  • Fig. 6 is a schematic view showing throughput performance curves of an LTE cell after being subject to switchover between transmission modes by use of an inappropriate threshold in the prior art
  • Fig. 7 is a schematic view of setting a threshold of switchover between transmission modes according to different moving speeds of a terminal in the prior art
  • Fig. 8 is a schematic flowchart of a method for switching between transmission modes for a terminal according to an embodiment of the present invention.
  • Fig. 9 is a schematic flowchart of a specific example of the method for switching between transmission modes for a terminal according to an embodiment of the present invention.
  • Fig. 10 is a schematic flowchart of a second method for switching between transmission modes for a terminal according to an embodiment of the present invention.
  • Fig. 11 is a schematic structure diagram of a system for switching between transmission modes for a terminal according to an embodiment of the present invention.
  • Fig. 12 is a schematic structure diagram of a first device for switching between transmission modes in a base station according to an embodiment of the present invention.
  • Fig. 13 is a schematic structure diagram of a second device for switching between transmission modes in a terminal according to an embodiment of the present invention.
  • the purpose of the embodiment of the present invention is to enable a base station to accurately determine a transmission mode to which a terminal is to be switched in order to improve the throughput performance of an LTE cell. It is necessary to determine an optimal transmission mode in a certain wireless channel environment and configure the optimal transmission mode to the terminal in order to adapt to various wireless propagation environments. However, in the methods for switching between transmission modes as mentioned in the technical background, it is unable to accurately determine the performance of a transmission mode.
  • a base station sends a set of transmission modes to a terminal, and after receiving information about a transmission mode having optimal performance in the set of transmission modes sent by the terminal, the base station configures a transmission mode for the terminal according to the information about this transmission mode.
  • This transmission mode having optimal performance is obtained by measuring each transmission mode in the set of transmission modes by the terminal, respectively.
  • the base station since the transmission mode configured for a terminal is determined according to information about a transmission mode having optimal performance fed back by the terminal, the base station accurately determines an optimal transmission mode for the terminal, thereby improving the throughput performance of an LTE cell.
  • the terminal can obtain the correlation of a wireless channel and a pre-coding matrix suitable for this wireless channel, by the measurement of a downlink reference signal. On this basis, the wireless channel quality can be calculated, and the correlation of the wireless channel, the pre-coding matrix and the channel quality are fed back to the base station. Since the pre-coding matrixes correspond, one by one, to the multi-antenna technologies, the terminal can obtain wireless channel quality of each multi-antenna technology, i.e., each transmission mode, by the measurement of the downlink reference signal. In this way, the terminal measures the wireless channel quality in each transmission mode in the set of transmission modes, respectively, to obtain a transmission mode having the best wireless channel quality, and then feeds this transmission mode back to the base station; and the base station configures this transmission mode to the terminal.
  • Fig. 8 is a schematic flowchart of a method for switching between transmission modes for a terminal according to an embodiment of the present invention, wherein this method includes the following specific steps.
  • a base station sends a set of transmission modes to a terminal.
  • the set of transmission modes contains a plurality of transmission modes.
  • the base station receives information about a transmission mode having optimal performance in the set of transmission modes sent by the terminal, the transmission mode having optimal performance being obtained by measuring each transmission mode in the set of transmission modes, respectively, by the terminal.
  • the transmission mode having optimal performance is the one corresponding to having best wireless channel quality determined by the terminal after measuring a downlink reference signal in each transmission mode in the set of transmission modes, respectively.
  • the base station configures a transmission mode for the terminal according to the information about this transmission mode.
  • Fig. 9 is a schematic flowchart of a specific example of the method for switching between transmission modes for a terminal according to an embodiment of the present invention, wherein this method includes the following specific steps.
  • a base station determines a set of transmission modes.
  • the set of transmission modes is a set of all transmission modes to be configured for the terminal, and can include a plurality of transmission modes.
  • the set of transmission modes can be determined according to its own capability of the base station. It can be the case where only several transmission mode is supported, or, with regard to some specific requirements, for example, the coverage of this base station is appropriate to several certain transmission modes, the several transmission modes can be included to form a set of transmission modes.
  • the base station self-adaptively configures a plurality of transmission modes as a set of transmission modes according to the wireless channel environment of the current cell (for example, an LTE cell).
  • the wireless channel environment of the current cell for example, an LTE cell.
  • all transmission modes supported by this base station are set as a set of transmission modes, and the set of transmission modes is updated according to the information about an optimal transmission mode subsequently reported by the terminal, and the updated set of transmission modes is set as the current set of transmission modes.
  • This manner can be applicable to the carrier aggregation situation in an LTE system, and for different cells, the set of transmission modes determined by the base station can be the same or different.
  • the terminal has the capability of assisting in deciding switchover between transmission modes, and informs the base station of this capability.
  • the terminal informs the base station of its capability by UE capability indication information UECapabilityInformation during an initial access process, and further, can inform whether this terminal supports this capability by the version information of the terminal or characterizes this capability by a set terminal capability field.
  • S903 The base station selects and informs the terminal of one transmission mode from the set of transmission modes as a primary transmission mode and other transmission modes as auxiliary transmission modes, after receiving this capability information informed by the terminal.
  • the selection is also based on the transmission mode support capability of the terminal.
  • the primary transmission mode is a transmission mode used for the current communication between the terminal and the base station; and it is possible to fixedly set a certain transmission mode as the primary transmission mode.
  • the primary transmission mode and the auxiliary transmission modes can be informed to the terminal by an RRC signaling; or, the set of transmission modes can be broadcast in a cell by a system broadcast message, and the primary transmission mode is informed to the terminal by an RRC signaling.
  • This manner can be applicable to the carrier aggregation situation, that is, a base station and a terminal both supporting carrier aggregation, and the primary transmission mode and the auxiliary transmission modes can be set in this manner in each cell, respectively.
  • S904 The terminal measures the performance of each transmission mode in the set of transmission modes, respectively, to determine a transmission mode having optimal performance.
  • the terminal can perform measurement for each cell, respectively and obtain information about a transmission mode having optimal performance.
  • the method for measuring the performance of a transmission mode and the accuracy of measurement depend upon the chip capability of the terminal and its own algorithm.
  • the existing technologies can be used, and will not be described in detail here.
  • the performance of each transmission mode can be obtained by measuring a downlink reference signal.
  • S905 The terminal sends information about an optimal transmission mode to the base station.
  • the terminal sends information about an optimal transmission mode to the base station by an RRC signaling.
  • the terminal can send information about an optimal transmission mode corresponding to a cell to the base station.
  • the base station sets the primary transmission mode according to the information about an optimal transmission mode reported by the terminal, and configures this primary transmission mode to the terminal.
  • the primary transmission mode is sent to the terminal for setting, by an RRC signaling message.
  • Fig. 10 is a schematic flowchart of a second method for switching between transmission modes for a terminal according to an embodiment of the present invention, wherein this method includes the following specific steps:
  • a terminal receives a set of transmission modes sent by a base station, measures the performance of each transmission mode in the set of transmission modes, respectively, to obtain and send information about a transmission mode having optimal performance;
  • S1002 the terminal sets a transmission mode according to configuration indication of the base station.
  • Fig. 11 is a schematic structure diagram of a system for switching between transmission modes for a terminal according to an embodiment of the present invention, including a base station and a terminal, wherein
  • the base station is configured to send a set of transmission modes to the terminal, and configure a transmission mode for the terminal according to information about a transmission mode having optimal performance received from the terminal;
  • the terminal is configured to receive the set of transmission modes sent by the base station, measure the performance of each transmission mode in the set of transmission modes, respectively, to obtain and send to the base station, information about a transmission mode having optimal performance,; and to set the transmission mode according to configuration indication of the base station to communicate with the base station.
  • Fig. 12 is a schematic structure diagram of a first device for switching between transmission modes in a base station according to an embodiment of the present invention.
  • This device is a base station, including a set determination module, a transceiving module and a configuration module, wherein
  • the set determination module is configured to determine a set of transmission modes
  • the configuration module is configured to configure a transmission mode for a terminal according to information about a transmission mode having optimal performance
  • the transceiving module is configured to send the set of transmission modes to the terminal, and receive the information about a transmission mode having optimal performance from the terminal.
  • Fig. 13 is a schematic structure diagram of a second device for switching between transmission modes in a terminal according to an embodiment of the present invention.
  • This device is a terminal, including a transceiving module, a measurement module and a configuration module, wherein
  • the transceiving module is configured to receive a set of transmission modes, send information about a transmission mode having optimal performance, and receive transmission mode configuration indication from the base station;
  • the measurement module is configured to measure the performance of each transmission mode in the set of transmission modes, respectively, to obtain the information about a transmission mode having optimal performance;
  • the configuration module is configured to set a transmission mode according to the transmission mode configuration indication of the base station.
  • Step 1 A base station supports five transmission modes, i.e., Transmission Mode 1, Transmission Mode 2, Transmission Mode 3, Transmission Mode 4 and Transmission Mode 9; Transmission Mode 3, Transmission Mode 4 and Transmission Mode 9 are included to form a set of transmission modes, or the five transmission modes are included to form a set of transmission modes; and the set of transmission modes is informed to terminals in an LTE cell.
  • Five transmission modes i.e., Transmission Mode 1, Transmission Mode 2, Transmission Mode 3, Transmission Mode 4 and Transmission Mode 9
  • Transmission Mode 3 Transmission Mode 4 and Transmission Mode 9 are included to form a set of transmission modes, or the five transmission modes are included to form a set of transmission modes; and the set of transmission modes is informed to terminals in an LTE cell.
  • Step 2 The terminals in the LTE cell feed back Transmission Mode 3, Transmission Mode 4 and Transmission Mode 9 as an optimal transmission mode, that is, there are three wireless channel environments in the coverage of the LTE cell which are appropriate to Transmission Mode 3, Transmission Mode 4 and Transmission Mode 9; and the base station updates the set of transmission modes, and decides the set of transmission modes to include Transmission Mode 3, Transmission Mode 4 and Transmission Mode 9.
  • Step 3 The terminal has the capability of assisting in deciding switchover between transmission modes. This capability is characterized by a UE-MulitTmreportSupported field.
  • the terminal informs the base station of this capability by UE capability indication information UECapabilityInformation.
  • the UE-MulitTmreportSupported field is present and set as "supported”, it is indicated that this terminal supports the terminal-assisted transmission mode switchover capability, or otherwise, if the UE-MulitTmreportSupported field is absent, it is indicated that this terminal does not support the terminal-assisted transmission mode switchover capability.
  • Step 4 The base station sets Transmission Mode 3 as the primary transmission mode and Transmission Mode 2 and Transmission Mode 9 as the auxiliary transmission modes after receiving the information about switchover capability of the terminal, and sends them to the terminal by an RRCConnectionReconfiguration message.
  • the base station broadcasts the set of transmission modes in an LTE by a system broadcast message, and sends the primary transmission mode to the terminal by an RRC signaling, for example, by an RRCConnectionReconfiguration message.
  • Step 5 The terminal determines the performance of the primary transmission mode, i.e., Transmission Mode 3, and the performance of the auxiliary transmission modes, i.e., Transmission Mode 2 and Transmission Mode 9.
  • the terminal can obtain the CQI of each transmission mode by the measurement of a downlink reference signal of a cell, and further obtain the performance of each transmission mode.
  • Step 6 The terminal regards Transmission Mode 9 as the current optimal transmission mode, according to the measurement of a downlink reference signal of a cell, when the CQI in Transmission Mode 9 is highest; and reports the current optimal transmission mode to the base station.
  • the terminal sends the optimal transmission mode to the base station by a transmission mode switching request message TMSwitchingRequest.
  • the terminal can perform transmission mode performance measurement for a plurality of cells respectively, and report an optimal transmission mode of the plurality of cells to the base station.
  • Step 7 The base station sets the optimal transmission mode reported by the terminal, i.e., Transmission Mode 9, as the primary transmission mode, and configures the primary transmission mode to the terminal.
  • the base station When the set of transmission modes in the above step is broadcast by a system broadcast message, the base station sends the primary Transmission Mode 9 to the terminal by an RRCConnnectionReconfiguartion message.
  • the base station When the set of transmission modes in the above step is sent to the terminal by an RRC signaling, the base station sends the primary Transmission Mode 9, as well as the auxiliary Transmission Mode 2 and the auxiliary Transmission Mode 3, to the terminal by an RRCConnnectionReconfiguartion message.
  • Step 8 After receiving the primary Transmission Mode 9, the terminal communicates with the base station by using this transmission mode. Step 5 to Step 7 are repeated.
  • the terminal-assisted inter-transmission-mode switchover it can be ensured that the terminal can use an optimal transmission mode under various wireless channel conditions. According to the actual simulation results, the sector average throughput can be improved by 8%.

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Abstract

La présente invention concerne un procédé, un dispositif et un système de commutation entre des modes d'émission pour un terminal. Dans un mode de réalisation de la présente invention, une station de base envoie un ensemble de modes d'émission à un terminal, et après réception d'informations concernant un mode d'émission ayant des performances optimales dans l'ensemble de modes d'émission envoyé par le terminal, la station de base configure un mode d'émission pour le terminal conformément aux informations concernant le mode d'émission. Le mode d'émission ayant les performances optimales est obtenu en mesurant respectivement les performances de chaque mode d'émission dans l'ensemble de modes d'émission par le terminal. Dans le mode de réalisation de la présente invention, étant donné que le mode d'émission configuré pour un terminal est déterminé conformément aux informations à propos d'un mode d'émission ayant des performances optimales renvoyées par le terminal, la station de base détermine avec précision un mode d'émission optimal pour le terminal, améliorant ainsi les performances de débit d'une cellule LTE.
PCT/KR2016/007902 2015-07-20 2016-07-20 Procédé, dispositif et système de commutation entre des modes d'émission pour un terminal WO2017014557A1 (fr)

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CN201510426785.3A CN106376016A (zh) 2015-07-20 2015-07-20 一种终端的传输模式间切换方法、装置及系统

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US10200855B1 (en) * 2016-11-29 2019-02-05 Sprint Communications Company L.P. Wireless communication system for adaptive multiple-input multiple-output (MIMO) transmission modes
EP3780764A4 (fr) * 2018-03-30 2021-04-28 Vivo Mobile Communication Co., Ltd. Procédé et dispositif permettant de déterminer un mode d'émission

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