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WO2011078751A1 - Procédé et appareil pour une sélection de mode de transmission - Google Patents

Procédé et appareil pour une sélection de mode de transmission Download PDF

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Publication number
WO2011078751A1
WO2011078751A1 PCT/SE2009/051472 SE2009051472W WO2011078751A1 WO 2011078751 A1 WO2011078751 A1 WO 2011078751A1 SE 2009051472 W SE2009051472 W SE 2009051472W WO 2011078751 A1 WO2011078751 A1 WO 2011078751A1
Authority
WO
WIPO (PCT)
Prior art keywords
mimo
base station
mode
radio base
mobile station
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/SE2009/051472
Other languages
English (en)
Inventor
Feng Zhu
Bo Göransson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to PCT/SE2009/051472 priority Critical patent/WO2011078751A1/fr
Publication of WO2011078751A1 publication Critical patent/WO2011078751A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H04B7/06—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
    • H04B7/0693—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas switching off a diversity branch, e.g. to save power
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding

Definitions

  • the present invention relates to a method and an apparatus selecting transmission mode in a cellular radio system capable of Multiple Input Multiple Output (MIMO) transmission.
  • MIMO Multiple Input Multiple Output
  • the invention also extends to a method and apparatus for transmitting information relating to the selected transmission mode.
  • Increasing the number of transmitting antennas is one way of increasing the capacity and coverage in a wireless radio system.
  • LTE Long Term Evolution
  • UMTS HSDPA transmit schemes for up to 2 antennas exists.
  • the increased number of antennas can be used to increase diversity, e.g. by using different kinds of transmission diversity schemes, or to increase the data rate by means of spatial multiplexing using Multiple Input Multiple Output, MIMO.
  • MIMO mode has larger signaling and power overhead costs than Non-MIMO mode since more parameters needs to be signaled. This is particularly true for single- stream transmission.
  • it can be beneficial to switch MIMO mode to Non-MIMO mode when the system makes decision on some principles and measures.
  • One way of providing a switch from a MIMO mode to a non-MIMO mode is described in the international patent application No. WO 08/133576.
  • a dynamic selection of MIMO mode (or switching to a non-MIMO mode) is provided by transmitting a mode selection command as a layer 1 command.
  • the base station can be set to control the transmission mode and there is no need to involve a control node when selecting transmission mode.
  • the mode selection not only will the mode selection be more dynamic, but there will be less signaling between the base station and the control node of a cellular radio system.
  • a Multiple Input Multiple Output, MIMO, data transmission mode selection method in a radio base station is provided. MIMO or a non- MIMO mode for transmission on a particular carrier is selected and the selected
  • transmission mode is signaled to the mobile station using a layer 1 message.
  • an adaptive MIMO (or non-MIMO) mode selection method can be implemented in a cellular radio system employing MIMO transmission. This is useful because the radio base station can take advantage of sudden changes in the radio link and or the current data load on the transmission over the air interface between the radio base station and a mobile station connected to the radio base station.
  • the selection of MIMO or a non-MIMO mode for transmission on a particular carrier is based on a pre-defined condition.
  • the condition can be channel related such as based on a Signal to Noise Ratio (SNR) or the rank of the channel.
  • the condition can be based on resources in the radio base station such as hard ware or software resources or available power or amount of data to be transmitted.
  • the system can be tuned to perform switching in accordance with a set of predefined rules that maximizes the performance of the system.
  • the layer 1 message comprises a first field representing the order type and a second field representing the order information.
  • the field representing the order type can for example represent the MIMO or non-MIMO mode and the field representing the order information represents a carrier selection or each bit in the field representing the order information represents a particular carrier.
  • existing layer 1 structures can be used.
  • the switch to the new MIMO or non-MIMO mode can be conditioned on a received acknowledgement from the mobile station.
  • the invention also extends to a radio base station configured to implement the above switching method and to a mobile station and a method in a mobile station for switching mode in the mobile station in accordance with the above.
  • a radio base station for selecting transmission mode in a multi carrier cellular radio network providing for data transmission using
  • the radio base station is adapted to transmit data to a mobile station.
  • the radio base station comprises means, such as a module or similar means, for selecting a MIMO or a non-MIMO mode for transmission on a particular carrier and means, such as a module or similar means, for signaling the selected transmission mode to the mobile station using a layer 1 message.
  • the radio base station comprises means for selecting a MIMO or a non-MIMO mode for transmission on a particular carrier based on a pre-defined condition.
  • the radio base station is configured to generate the layer 1 message comprising a first field representing order type and a second field representing order information.
  • the field representing the order type represents the MIMO or non-MIMO mode and the field representing the order information represents a carrier selection.
  • each bit in the field representing the order information represents a particular carrier.
  • the radio base station comprises means (109) for switching to the selected MIMO or non-MIMO mode conditioned on a received
  • a method in a mobile station for selecting mode for receiving data in a multi carrier cellular radio network providing for data transmission using Multiple Input Multiple Output, MIMO data transmission.
  • Data is transmitted between a radio base station and the mobile station.
  • the method comprises receiving a layer 1 message from the radio base station, the message comprising information indicating which MIMO or non-MIMO mode used for transmission on a particular carrier, and switching to a MIMO or a non-MIMO mode for receiving data on a particular carrier based on the information in said layer 1 message.
  • the mobile station transmits an acknowledgement to the radio base station acknowledging reception of the layer 1 message.
  • a mobile station adapted to selecting mode for receiving data in a multi carrier cellular radio network providing for data transmission using Multiple Input Multiple Output, MIMO, data transmission.
  • the mobile station is adapted to re3ceive data from a radio base station, the mobile station comprising means such as module or similar means, for receiving a layer 1 message from the radio base station, the message comprising information indicating which MIMO or non-MIMO mode to use for receiving data on a particular carrier, and means, such as a module or similar means, for switching to a MIMO or a non-MIMO mode for receiving data on a particular carrier based on the information in said layer 1 message
  • - Fig. 1 is a general view of a cellular radio system
  • - Fig. 2 is a view of a layer 1 order message
  • - Fig. 3 is a flowchart illustrating some procedural steps performed when transmitting a layer 1 order in a radio base station
  • - Fig. 4 is a flowchart illustrating some procedural steps performed when receiving a layer 1 order in a mobile station.
  • HSDPA High Speed Downlink Packet Access
  • the invention is, however, not limited to use in an HSDPA system.
  • the invention can hence be used in any type of cellular radio system employing MIMO and where a switch between different MIMO modes and /or to/from a MIMO mode is employed, such as a Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • a general view of a cellular radio system 100 is depicted.
  • the system can for example be a HSDPA system adapted for data transmission using Multiple Input Multiple Output (MIMO).
  • the system comprises a number of radio base stations 101, here denoted NodeBs.
  • a mobile station 103 here denoted User Equipment UE, that is in a geographical area covered by the radio base station can connect to the radio base station over an air- interface.
  • the base station 101 further comprises a module 105 for generating layer- 1 commands to the mobile station 103.
  • the module 105 can for example be implemented using a microcontroller operating on a set of computer software instructions stored on a memory in the module 105.
  • the mobile station 103 in turn comprises a module 107 adapted to receive layer- 1 commands from the radio base station 101 and to configure the mobile station in accordance with the command.
  • the module 107 can for example be implemented using a microcontroller operating on a set of computer software instructions stored on a memory in the module 107.
  • the selection of which transmission mode to use can be made in a mode selection module 109 in the radio base station 101.
  • the module 109 can for example be implemented using a microcontroller operating on a set of computer software instructions stored on a memory in the module 109.
  • the selection of data transmission mode can be to switch to and from MIMO mode or to switch between different MIMO modes. Other configurations of the radio base station and the mobile station are also envisaged.
  • the functions provided by the radio base station and mobile station can be distributed to other modules or fewer modules than the modules 105, 107 and 109.
  • the selection of transmission mode can be performed in accordance with a number of different methods. For example, in accordance with one embodiment MIMO can be selected based on the momentary measured SINR and the rank of the channel which a mobile station transmits report on. For example if a mobile station has requested single stream for some consecutive time- slots the system can be configured to switch off MIMO to such a user.
  • the selection of transmission mode can also be configured to depend on the amount of data to transmit to a particular user.
  • the resources in terms of utilization of existing hardware and soft ware blocks or processor capacity or
  • transmission power can be used when determining MIMO transmission mode (or non- MIMO transmission mode).
  • the system can be configured to switch MIMO mode, in particular to a non-MIMO mode) for one user in favour of another (prioritized) user requires increased transmission power or other resources.
  • MIMO mode in particular to a non-MIMO mode
  • the system can be configured to switch to non- MIMO mode for a user using MIMO to free up resources for a user having better need for the resources, for example because the other user has a higher priority.
  • Fig. 2 an exemplary structure of a layer 1 order is depicted.
  • the layer 1 order message can comprise two fields; a first field representing the order type and a second field representing the order information.
  • the structure of the order in Fig. 2 can for example be the structure of a High Speed Shared Control Channel (HS-SCCH) order.
  • the exemplary order of Fig. 2 comprises of 7 bits. The first three bits represent the order type and the last 4 bits represent order information. In MIMO mode, HS-SCCH type is '3' which means that order information only has 3 bits available because 1 bit is typically reserved.
  • the order type can be set to represent 'MIMO' and 'Non-MIMO' mode whereas 'order info' represents the carrier selection in a multi carrier system.
  • one HS-SCCH order can be used to inform the UE 103 about the configuration for all carriers.
  • order type ⁇ 1 and '000' can be used to indicate 'MIMO' and 'Non-MIMO' mode separately.
  • the order information bits can be used to indicate the carrier.
  • the numbering of the carriers can for example be made known to both the network and UE by means of higher layer signaling.
  • each bit of 'order info' corresponds to each carrier.
  • ⁇ 0 can be set to indicate that the 1 st and the 3 rd carriers are enabled by MIMO mode but the mode of the 2 nd carrier is kept. In this way several carriers can be switched by one order.
  • the 'order type' bits can be used to indicate more types of 'MIMO' and 'Non-MIMO' when 'order information' indicates the number of a specified carrier.
  • the different transmission modes that the base station can select between can include, but is not limited to Space-Time Transmit Diversity (STTD) (Non-MIMO), Fix pre-coding mapping a signal stream to multiple transmit antennas with equal load on all power amplifiers of the respective multiple transmit antennas regardless of the number of signal streams, (Non-MIMO), Transmit Adaptive Array (TxAA) or closed loop transmit diversity for WCDMA/HSDPA (Non-MIMO), Single antenna 1 (Non- MIMO), Single antenna 2 (Non-MIMO), Rel-7 MIMO (MIMO) also known as D-TxAA (dual stream TxAA), Per Antenna Rate Control (PARC) (MIMO), Selective-PARC (S- PARC) (MIMO).
  • STTD Space-Time Transmit Diversity
  • TxAA Transmit Adaptive
  • the meaning of the coding bits in the order is reversed.
  • the order information bits are used to indicate the number of a specified carrier and the Order type' bits are used to indicate the particular transmission mode including different types of 'MIMO' and 'Non-MIMO' transmission schemes.
  • a number of sequential orders can be sent from the base station to the UE. For example, if carrier 1 is switched to STTD when carrier 3 is switched to D-TxAA, then two orders corresponding to STTD and D-TxAA are sent to UE sequentially.
  • the reliability of the orders can be improved if an ACK/NACK procedure is used. Since there is a small probability that the UE misses the order due to misdetection, it is important to the network to know if the UE has received the correct order. For example, if the UE misses an order to switch on MIMO reception one a certain carrier, it will not be able to decode the HS-SCCH transmitted since it expects a HS-SCCH format used for non- MIMO transmissions. To eliminate this problem a procedure similar to the procedure described in the international application No. WO 2009/093975 can be extended to support MC-HSDPA as well. That is, the HARQ ACK/NACK transmitted on the HS-DPCCH can be used to acknowledge MIMO mode orders.
  • CQI MIMO Channel Quality Indicator
  • CQI type A MIMO CQI where the mobile station reports how many streams it requires and the quality on each stream.
  • CQI type B a forced single stream CQI, i.e. the mobile station reports the quality a single stream should have regardless of if the mobile station could receive additional streams.
  • Fig. 3 some procedural steps performed when selecting transmission mode in a MIMO enabled radio base station in accordance with the above are depicted.
  • the radio base station selects which transmission mode, such as MIMO or non- MIMO; or a particular MIMO mode to use for a particular carrier. The selection can be made based on any suitable criteria including but not limited to those described herein.
  • a step 303 a layer 1 message is generated and transmitted to the mobile station that the selected transmission mode concerns. Thereupon the radio base station switches transmission mode in accordance with the selected mode in a step 305.
  • the switching to new mode can in accordance with one embodiment be conditioned on the reception of an acknowledgement from the mobile station of the layer 1 message informing the mobile station of the new transmission mode.
  • the acknowledgment procedure can for example be implemented as described above.
  • the selection of MIMO or a non-MIMO mode for transmission on a particular carrier is based on a pre-defined condition.
  • the condition can be channel related such as based on a Signal to Noise Ratio (SNR) or the rank of the channel.
  • SNR Signal to Noise Ratio
  • the condition for triggering a switch to another transmission mode can be based on resources in the radio base station such as hard ware or software resources or available power or amount of data to be transmitted.
  • Fig. 4 some procedural steps performed when receiving a layer 1 message in a MIMO enabled mobile station informing the mobile station that a new transmission mode is to be used for a particular carrier.
  • the mobile station receives a layer 1 message ordering the mobile station to use a particular transmission mode when receiving data from the radio base station.
  • the mobile station is adapted to employ the mode corresponding to the received layer 1 message.
  • the step 403 includes acknowledging the received layer 1 message as described above.
  • the mobile station can then expect to receive data in the new mode a pre-determined number X of time- slots later.
  • an improved switching between different MIMO modes including switching to and from a MIMO mode in a multi-carrier system is obtained.
  • the switching can be made adaptively because the signaling does need to involve higher layer signaling but can be performed using layer 1 signaling. As a result a more efficient transmission can be obtained by enabling the base station to select the best transmission mode at any particular time. Also, because there is no need for higher layer signaling there is no need for signaling between the base station and a central control node, which in turn reduces the overall signaling in the system.

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

Abstract

Selon l'invention, une sélection dynamique de mode de transmission pour un système cellulaire multi-porteuse supportant un fonctionnement multiples entrées multiples sorties (MIMO) permettant une sélection dynamique du mode MIMO (ou une commutation à un mode non-MIMO), est assurée par transmission d'une instruction de sélection de mode en tant qu'instruction de couche 1. Ainsi, la station de base peut être réglée pour commander le mode de transmission et il n'y a pas besoin d'impliquer un nœud de commande lors de la sélection du mode de transmission. En conséquence, non seulement la sélection de mode sera davantage dynamique, mais il y aura moins de signalisation entre la station de base et le nœud de commande d'un système cellulaire.
PCT/SE2009/051472 2009-12-21 2009-12-21 Procédé et appareil pour une sélection de mode de transmission Ceased WO2011078751A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2009/051472 WO2011078751A1 (fr) 2009-12-21 2009-12-21 Procédé et appareil pour une sélection de mode de transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2009/051472 WO2011078751A1 (fr) 2009-12-21 2009-12-21 Procédé et appareil pour une sélection de mode de transmission

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3520463A4 (fr) * 2016-09-30 2020-04-29 Qualcomm Incorporated Acquisition d'informations d'état de canal (csi) pour transmission mimo dynamique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050111424A1 (en) * 2003-11-24 2005-05-26 Industrial Technology Research Institute Apparatus of transmitter and receiver for MIMO MC-CDMA system
EP1643661A2 (fr) * 2004-09-07 2006-04-05 Samsung Electronics Co.,Ltd. Système MIMO avec commutation adaptatif du schéma d'emission
WO2006040664A1 (fr) * 2004-10-15 2006-04-20 Nokia Corporation Etage de selection et mecanisme pratiques et simplifies, et procede associe, permettant d'adapter la modulation mimo dans un systeme multi-porteuse a retroaction
US20070160156A1 (en) * 2006-01-09 2007-07-12 Ezer Melzer Wireless communication device employing interference-sensitive mode selection and associated methods
WO2009120118A1 (fr) * 2008-03-25 2009-10-01 Telefonaktiebolaget Lm Ericsson (Publ) Procédés et dispositifs pour la signalisation de flux de données modulées multiples

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050111424A1 (en) * 2003-11-24 2005-05-26 Industrial Technology Research Institute Apparatus of transmitter and receiver for MIMO MC-CDMA system
EP1643661A2 (fr) * 2004-09-07 2006-04-05 Samsung Electronics Co.,Ltd. Système MIMO avec commutation adaptatif du schéma d'emission
WO2006040664A1 (fr) * 2004-10-15 2006-04-20 Nokia Corporation Etage de selection et mecanisme pratiques et simplifies, et procede associe, permettant d'adapter la modulation mimo dans un systeme multi-porteuse a retroaction
US20070160156A1 (en) * 2006-01-09 2007-07-12 Ezer Melzer Wireless communication device employing interference-sensitive mode selection and associated methods
WO2009120118A1 (fr) * 2008-03-25 2009-10-01 Telefonaktiebolaget Lm Ericsson (Publ) Procédés et dispositifs pour la signalisation de flux de données modulées multiples

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3520463A4 (fr) * 2016-09-30 2020-04-29 Qualcomm Incorporated Acquisition d'informations d'état de canal (csi) pour transmission mimo dynamique

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