WO2008077629A1 - Réception multi-segment à consommation efficace - Google Patents

Réception multi-segment à consommation efficace Download PDF

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Publication number
WO2008077629A1
WO2008077629A1 PCT/EP2007/011385 EP2007011385W WO2008077629A1 WO 2008077629 A1 WO2008077629 A1 WO 2008077629A1 EP 2007011385 W EP2007011385 W EP 2007011385W WO 2008077629 A1 WO2008077629 A1 WO 2008077629A1
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WO
WIPO (PCT)
Prior art keywords
receiving branch
branch
checking
receiving
signal
Prior art date
Application number
PCT/EP2007/011385
Other languages
English (en)
Inventor
Ülo PARTS
Juha Heiskala
Mikko Kokkonen
Original Assignee
Nokia Corporation
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
Priority claimed from US11/756,141 external-priority patent/US20080151871A1/en
Application filed by Nokia Corporation filed Critical Nokia Corporation
Publication of WO2008077629A1 publication Critical patent/WO2008077629A1/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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
    • 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 a method, system, apparatus, receiver module, and computer program product for providing power-efficient reception in system with at least two receiving branches or chains.
  • MIMO Multiple Input Multiple Output
  • SIMO Single Input Multiple Output
  • MIMO Multiple Input Multiple Output
  • antenna arrays are used to enhance bandwidth efficiency.
  • MIMO systems provide multiple inputs and multiple outputs for a single channel and are thus able to exploit spatial diversity and spatial multiplexing. Further information about MIMO systems can be gathered from the IEEE specifications 802.11 n,
  • 802.16-2004 and 802.16e as well as 802.20 and 802.22 which relate to other standards.
  • MIMO systems have been introduced to radio systems like e.g. WiMAX (Worldwide Interoperability for Microwave Access) and are currently standardized in 3GPP for WCDMA (Wideband Code Division Multiple Access) as well as 3GPP E-UTRAN (Enhanced Universal Mobile Telecommunications System
  • UMTS Universal Mobile Telecommunications
  • LTE Long Term Evolution
  • 3.9G Long Term Evolution
  • a mobile station also referred to us “user equipment” (UE) in 3D terminology
  • MS mobile station
  • UE user equipment
  • 3D terminology may have a linear or non-linear recep- tion unit and Mr reception antennas, while the node B has Mt transmission antennas.
  • CS channel state information
  • the BS may perform appropriate space-time processing such as multiuser sched- uling, power and modulation adaptation, beamforming, and space-time coding.
  • the CSI may include a channel direction information (CDI) and a channel quality information (CQI), which can be used for determining beamforming direction and power allocation.
  • CDI channel direction information
  • CQI channel quality information
  • frequencies allocated to a service are re-used in a regular pattern of areas, called 'cells', each covered e.g. by one base station.
  • 'cells' areas
  • adjacent cells use different frequencies.
  • a set of C different frequencies ⁇ fi, ..., fc) can be used for each cluster of C adjacent cells.
  • Cluster patterns and the corresponding frequencies are re-used in a regular pattern over the entire service area.
  • SIR signal-to-interference
  • One of the goals is to support high data rates and high spectral efficiency.
  • the latter goal is achievable by applying MIMO techniques which re- quire at least two receiver chains or branches in the user terminal.
  • an apparatus comprising:
  • a switching unit for adding to said at least one selected receiving branch at least one additional receiving branch for retransmission, if said information has not been received successfully.
  • the apparatus may be configured as a receiver apparatus, a transceiver apparatus which comprises an additional transmitting functionality or unit, or as a receiver module provided as a part or integrated circuit of a more complex apparatus or system.
  • a communication system comprising at least one of the above apparatus and at least one transmitter for communicating with said apparatus.
  • a reduced number of receiving branches or chains can be selectively used, so that a trade-off can be achieved between savings in power consumption and reduction in the network capacity.
  • This trade-off can optionally be controlled to favour either a low power consumption or a small reduction in the network capacity e.g. by selecting a suitable threshold value so as to switch off a weaker antenna or branch only if the received signal level (or power) difference exceeds the pre- selected threshold value.
  • a suitable threshold value so as to switch off a weaker antenna or branch only if the received signal level (or power) difference exceeds the pre- selected threshold value.
  • low power consumption e.g. VoIP services or the like.
  • branch selection may be based on the difference between signal strengths received via available receiving branches.
  • an available receiving branch could be switched off, if the difference between a signal strength received via this available receiving branch and a signal strength received via another available receiving branch exceeds a predetermined threshold.
  • an available receiving branch could be switched off, if signal strengths received via this available receiving branch and at least one other available receiving branch exceed a predetermined minimum strength.
  • a network load may be determined and the at least one selected receiving branch may be selected based on the result of the load measuring.
  • selection may be based on load information received from the network.
  • the network load may be estimated, wherein the selection is based on the estimated load.
  • the at least one selected receiving branch may be switched on and the at least one additional receiving branch may be switched off. Thereby, power consumption can be kept low initially and can be increased based on the actual environmental conditions and resulting reception quality.
  • This default setting may be controlled e.g. by the above mentioned switching unit.
  • the checking functionality may be based on or may comprise a determination as to whether a retransmission is initiated by a retransmission function.
  • branch selection or receiver diversity control can be tied to retransmission decisions, so that implementation of the control is facilitated.
  • the proposed retransmission function may be a hybrid automatic repeat request (H-ARQ) function.
  • the receipt of the transmission signal may be based on a predeter- mined transmission timing. That is, to get knowledge of a signal transmission and resulting possibility of receiving a signal even in cases where reception conditions via the reduced number of branches (e.g., only one branch) are so weak that de- tecetion would not be possible at all, the predetermined timing can be used to assume non-successful receipt and thus switch to the enhanced number of branches (e.g., all branches).
  • the transmission signal may be a voice signal transmitted over a packet-switched network, such as a VoIP signal.
  • Reception via the at least one selected receiving branch may be continued, if the checking, e.g., by the above checking unit, reveals that the transmission signal has been received successfully, so that power consumption can be kept low.
  • the at least one selected receiving branch may be se- lected - e.g. as a default setting - based on the result of a signal quality measuring. This selection may be based on a predetermined threshold value.
  • the proposed power-efficient branch selection i.e., the above mentioned receiving, checking and adding, may be performed or activated only for at least one pre- determined transmission service.
  • an information may be signaled and received, which indicates the at least one predetermined transmission service.
  • Fig. 1 shows a schematic block diagram of a multi-branch radio receiver apparatus according to the embodiment
  • Fig. 2 shows a schematic flow diagram of a branch selection operation according to the embodiment.
  • Fig. 3 shows a schematic block diagram of a computer-implemented embodiment.
  • a multi-antenna radio apparatus which may be any type of device, component, circuit, module etc., such as - but not limited to - a wireless access device, a cellular base station device, a cellular telephone, a handheld computer, a multimedia device, or an integrated chip.
  • the apparatus according to the embodiment can be employed in any wireless communication network which allows receipt of transmission signals via different receiving branches or chains.
  • the present invention is by no means intended to be limited to wireless multi-antenna apparatuses. Rather, it can be used in any receiver or transceiver apparatus which comprises at least two receiving branches or chains for receiving a signal tranmitted over a wired or wireless medium.
  • the multi-antenna radio apparatus may be a SIMO- or MIMO-based apparatus including different multi-antenna operating modes, e.g., SU-MIMO as well as MU-MIMO, for an exemplary case of two available receiving (Rx) antennas. It may be provided in an evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (EUTRAN) environment.
  • UMTS Universal Mobile Telecommunications System
  • EUTRAN evolved Universal Mobile Telecommunications System
  • the present invention can be applied to any other network architecture with different radio access technologies involving multi-antenna transmitter devices, e.g., user terminals (such as user equipments (UEs), mobile stations or mobile phones), base station devices, access points or other access devices.
  • Fig. 1 shows a schematic block diagram of an exemplary multi-antenna radio apparatus 10, such as a mobile station (or UE in 3G terminology), which can be radio-connected to a base station device (not shown) or Node B (in 3G terminology) or other type of wireless access device.
  • the radio apparatus 10 may as well be any other wireless transmit/receive unit which comprises a multi-branch receiver functionality or module.
  • Fig. 1 two antennas are connected to a receiver with respective receiver units Rx1 12 and Rx2 14. Of course, both antennas could as well be connected to a single receiver unit having separate receiving branches or chains.
  • the receiver units 12 and 14 are further connected to a signal processing stage 20 which is responsible for receiver-related processing, such as demodulating, descrambling, decoding etc. for a received transmission signal, in order to output received data 50.
  • the signal processing stage 20 is controlled by a branch selection functionality or unit 30 which generates a branch selection control signal 40 based on a reception quality information 60 issued by or derived from the signal processing stage 20, to thereby control the number of receiving branches or chains to be used for reception.
  • a branch selection functionality or unit 30 which generates a branch selection control signal 40 based on a reception quality information 60 issued by or derived from the signal processing stage 20, to thereby control the number of receiving branches or chains to be used for reception.
  • branch selection control unit 30 not necessarily has to be provided as a physically separated unit. It may be implemented as a discrete circuit part or additional software routine provided in the the signal processing stage 20 or any other control function or processing device of the radio apparatus 10.
  • a packet at receiver decoding is in error
  • a re- transmission is requested, wherein the MIMO transmitter can use the same format to re-transmit the packet.
  • the packet can be re-transmitted using the same error-encoded packet or can be re-transmitted using different error coding redundancy.
  • the re-transmitted packet and erroneous packet can be combined in soft symbol form or can be decoded with the re-transmitted packet and erroneous packet as a code coming. This procedure is called hybrid automatic repeat request
  • H-ARQ can be used to derive the reception quality information 60 used by the branch selection unit 30 to decide on selection of the used receiving branch(es). If H-ARQ retransmission is initiated, this indicates that reception was not successful. However, of course, other reception quality indicators could be used for triggering branch selection.
  • the radio apparatus 10 can be set to an single- branch operation mode where only one receiver branch or chain is activated or selected, although network deployment may demand usage of at least two Rx antennas.
  • This single-branch operation mode can be selected fors specific low data rate services (such as VoIP or the like) which require less network capacity. Thereby, power consumption can be reduced.
  • the single-branch operation mode may be selected as a default setting or in dependence on a indication of a corresponding service which allows reduced network capacity.
  • the one receiving branch or chain may be selected based on initial or continuous signal quality measurements of both receiving branches or chains, i.e., kind of selection diversity.
  • Fig. 2 shows a schematic flow diagram of a branch selection operation according to an embodiment.
  • a low data rate packet (e.g. VoIP packet) is received with one receiver branch or chain, e.g. the signal processing stage 20 is controlled by the branch selection unit 30 to select only one of the receiver units 12, 14 for reception.
  • the signal processing stage 20 is controlled by the branch selection unit 30 to select only one of the receiver units 12, 14 for reception.
  • This may achieved based on a quality measurement and involve a corre- sponding control signaling between the signal processing stage 20 and/or the branch selection unit 30 on one hand, and the receiver units 12, 14 on the other hand, so as to deactivate or deselect one of the receiver units 12, 14.
  • step S102 data is received via the selected receiving branch or chain, and it is checked in step S103 whether reception of a packet or signal portion was successful, e.g., based on a decision on H-ARQ retransmission as signaled by the reception quality information 60. If the reception was determined to be successful, i.e. no retransmission required, predetermined quality or signal-to-interference
  • step S104 the procedure jumps back to step S102 and waits for the receipt of the next packet or signal portion. If reception is determined in step S103 to be not successfully, retransmission of the same packet will be requested to the transmitting end (due to H-ARQ) and the branch selection unit 30 issues a branch selection control information 40 so as to switch-on the available second receiver branch or chain in step S104, so that the retransmitted packet will be received via both receiver branches or chains. During this period also signal quality measurements of both or all branches can be performed in step S105.
  • receiver branches or chains may be provided, so that switching or selection may be performed for more than one branch or chain. Any number of receiving branches or chains can be selected and combined based on a desired quality and amount of power saving.
  • the embodiment thus provides a trade-off between savings in the power con- sumption and reduction in the network capacity.
  • the trade-off can be controlled to favour either a low power consumption or a small reduction in the network capacity by selecting a suitable threshold value and by switching off the weaker antenna or branch only if the received signal level (or power) difference exceeds the preselected threshold value.
  • power consumption in the apparatus can be reduced in case of predetermined low data rate services, e.g., VoIP service.
  • the number of Rx antennas that are used may be determined by thresholding a feature or parameter related to signal quality. This feature or parameter could be for example the difference between respective signal strengths.
  • the idea is that if the difference is large enough, the other branch can be switched off without substantially affecting detection performance.
  • Another example is that if either of the antenna signals is strong enough, then the reception will be successful even without the other antenna.
  • the information about the network load could be obtained in various ways. It could be signaled to the radio apparatus 10 by the network, or the load could be estimated by the radio apparatus 10. In the latter case, one possibility could be to analyze control channel information, such as allocation of time- frequency resources to radio apparatuses (e.g. UEs, mobile terminals, mobile sta- tions, etc.) or indirect methods like total power measurements of a symbol, where only dedicated data is transmitted, etc.
  • radio apparatuses e.g. UEs, mobile terminals, mobile sta- tions, etc.
  • indirect methods like total power measurements of a symbol, where only dedicated data is transmitted, etc.
  • the initial single-branch or partial-branch operation mode may be activated based on an information received from the transmitting side (e.g. base station device such as a base transceiver station (BTS) or node B) or network side, which informs the radio apparatus 10 (e.g. user terminal) that for some time interval only a low data rate service is scheduled to the radio apparatus 10.
  • the transmitting side e.g. base station device such as a base transceiver station (BTS) or node B
  • BTS base transceiver station
  • node B e.g. user terminal
  • the radio apparatus 10 may be enabled to detect that a first non-successful transmission has occurred based on a predetermined or known transmission timing of the data packets or signal portions, so that the radion transmitter 10 knows straight away if it has failed to receive one, and the signal processing stage
  • the 20 can generate a corresponding reception quality information 60 to trigger selection of all or more receiving branches or chains.
  • the H-ARQ process or any other reception quality determination process can be used to drive receiving branch selection control.
  • Fig. 3 shows a schematic block diagram of a software-based implementation of the proposed functionalities for achieving channel-sensitive complexity adjustment.
  • a processing unit 210 which may be any processor or computer device with a control unit which performs control based on software routines of a control program stored in a memory 212.
  • Program code instructions are fetched from the memory 212 and are loaded to the control unit of the processing unit 210 in order to perform the processing steps of the above functionalities described in connection with the respective branch selection and signal processing blocks 20, 30 of Fig. 1 and the flow diagram of Fig. 2.
  • processing steps may be performed on the basis of input data Dl and may generate output data DO, wherein the input data Dl may correspond to output of a retransmission function and/or other quality indicator information, and the output data DO may correspond to control information used for selecting a corresponding number of receiving branches or chains.
  • a method, system, apparatus, receiver module and computer program product for providing a power-efficient reception have been described, wherein a transmission signal is initially received via at least one selected or default receiving branch. Then, it is checked whether the transmission signal has been received successfully, and at least one additional receiving branch is added to the at least one selected receiving branch for retransmission, if the transmission signal has not been received successfully. Thereby, a trade-off between savings in power consumption and reduction in network capacity can be achieved.
  • the present invention is not restricted to the embodiments described above, but can be implemented in any communication apparatus with a multi-branch or multi-chain receiver functionality for any type of wired or wireless application.
  • the transmission signal may be received from a cable, optical fibre, or other type of electrical, magnetic, electro-magnetic or optical waveguide.
  • the processing steps of Fig. 2 may be implemented as discrete digital circuits, modules or logical signal processing structures. The embodiment may thus vary within the scope of the attached claims.

Abstract

La présente invention concerne un procédé, un système et un appareil, un module récepteur et un programme informatique pour permettre une réception efficace au niveau de l'alimentation : un signal de transmission est initialement reçu par le biais d'au moins un segment de réception sélectionné ou par défaut. Ensuite, on vérifie si le signal de transmission a bien été reçu et au moins un segment de réception supplémentaire est ajouté au ou aux segments de réception sélectionnés pour la retransmission, si le signal de transmission n'a pas été reçu correctement. Par conséquent, il est possible de réaliser un compromis entre des économies de consommation d'énergie et une réduction de la capacité du réseau.
PCT/EP2007/011385 2006-12-22 2007-12-21 Réception multi-segment à consommation efficace WO2008077629A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP06026808 2006-12-22
EP06026808.3 2006-12-22
US11/756,141 US20080151871A1 (en) 2006-12-22 2007-05-31 Power-Efficient Multi-Branch Reception
US11/756,141 2007-05-31

Publications (1)

Publication Number Publication Date
WO2008077629A1 true WO2008077629A1 (fr) 2008-07-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2194650A2 (fr) * 2008-12-02 2010-06-09 Broadcom Corporation Sections RF configurables pour récepteur et transmetteur et procédés d'utilisation associés
CN103620982A (zh) * 2011-04-05 2014-03-05 高通股份有限公司 动态接收分集切换
WO2017108117A1 (fr) * 2015-12-22 2017-06-29 Sony Mobile Communications Inc. Exploitation d'un système de communications sans fil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030153358A1 (en) * 2002-02-09 2003-08-14 Jaekyun Moon Apparatus and method for dynamic diversity based upon receiver-side assessment of link quality
US6690927B1 (en) * 1999-11-30 2004-02-10 Fraunhofer-Gessellschaft Zur Foerderung Der Angewandten Forschung E.V. DECT transmit-receive terminal and method for communicating between a DECT transmit-receive terminal and a DECT base station
US20040253955A1 (en) * 2003-06-10 2004-12-16 Love Robert T. Diversity control in wireless communications devices and methods

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6690927B1 (en) * 1999-11-30 2004-02-10 Fraunhofer-Gessellschaft Zur Foerderung Der Angewandten Forschung E.V. DECT transmit-receive terminal and method for communicating between a DECT transmit-receive terminal and a DECT base station
US20030153358A1 (en) * 2002-02-09 2003-08-14 Jaekyun Moon Apparatus and method for dynamic diversity based upon receiver-side assessment of link quality
US20040253955A1 (en) * 2003-06-10 2004-12-16 Love Robert T. Diversity control in wireless communications devices and methods

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2194650A2 (fr) * 2008-12-02 2010-06-09 Broadcom Corporation Sections RF configurables pour récepteur et transmetteur et procédés d'utilisation associés
EP2194650A3 (fr) * 2008-12-02 2014-12-24 Broadcom Corporation Sections RF configurables pour récepteur et transmetteur et procédés d'utilisation associés
CN103620982A (zh) * 2011-04-05 2014-03-05 高通股份有限公司 动态接收分集切换
CN103620982B (zh) * 2011-04-05 2016-08-10 高通股份有限公司 动态接收分集切换
WO2017108117A1 (fr) * 2015-12-22 2017-06-29 Sony Mobile Communications Inc. Exploitation d'un système de communications sans fil
US10587328B2 (en) 2015-12-22 2020-03-10 Sony Corporation Operating a wireless communication system

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