WO2008155689A2 - Procédé permettant d'attribuer des ressources de transmission dans un système de télécommunication, station primaire et station secondaire permettant la mise en oeuvre d'un tel procédé - Google Patents

Procédé permettant d'attribuer des ressources de transmission dans un système de télécommunication, station primaire et station secondaire permettant la mise en oeuvre d'un tel procédé Download PDF

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Publication number
WO2008155689A2
WO2008155689A2 PCT/IB2008/052310 IB2008052310W WO2008155689A2 WO 2008155689 A2 WO2008155689 A2 WO 2008155689A2 IB 2008052310 W IB2008052310 W IB 2008052310W WO 2008155689 A2 WO2008155689 A2 WO 2008155689A2
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WO
WIPO (PCT)
Prior art keywords
indication
station
resources
secondary station
transmission
Prior art date
Application number
PCT/IB2008/052310
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English (en)
Other versions
WO2008155689A3 (fr
Inventor
Paul Bucknell
Matthew P. J. Baker
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2008155689A2 publication Critical patent/WO2008155689A2/fr
Publication of WO2008155689A3 publication Critical patent/WO2008155689A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • 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 for allocating transmission resources in a telecommunication system, a system of telecommunication using this method, a primary station and a secondary station using the same method. More specifically, this invention is, for example, relevant for a mobile telecommunication system like a
  • UMTS Universal Mobile Telecommunications System
  • the UMTS Terrestrial Radio Access Network (or UTRAN), which is responsible for handling all radio related functionality and which comprises a plurality of base stations (also called NodeB or primary stations), is linked to the user terminals (also called user equipments or secondary stations or mobile stations).
  • UTRAN UMTS Terrestrial Radio Access Network
  • the secondary stations are transmitting data only on respective transmission resources, to avoid collisions of signals.
  • These transmission resources are defined mainly by a frequency, a modulation coding scheme (MCS) and a transmission time interval during which they are allowed to transmit by using those parameters.
  • MCS modulation coding scheme
  • pre-assigned resources may be allocated to each secondary station, in particular for the first HARQ (for Hybrid Automatic Repeat re-Quest) transmissions and the retransmissions. It means that the secondary station transmits by using the predefined resources (typically frequency and modulation coding scheme) in a predefined transmission time interval.
  • predefined resources typically frequency and modulation coding scheme
  • the TTI is indicated by the time of transmission of this indication from the primary station to the secondary station: the allocated TTI will start after a fixed period starting from the sending of the indication signal. Indeed, the timing of the transmission will be a fixed time period offset from the reception and decoding of the L1/L2 downlink control information.
  • the secondary station monitors continuously the L1/L2 control channel to check whether it can find its Cell Radio Network Temporary Identity (an address for identifying all secondary stations within a cell, noted C-RNTI). If its C-RNTI is found in a message on the L1/L2 control channel, it means that a transmission resource has been allocated dynamically, and that the pre assigned resources are overridden by the indicated resource. Then, the secondary station will transmit data to the primary station only by using the indicated resource, and within the subsequent TTI, starting after a predetermined time period from the sending of the indication. It will not use the pre assigned resource.
  • C-RNTI an address for identifying all secondary stations within a cell
  • the discontinuous reception mode typically authorized by the primary station, which instructs parameters of the discontinuous mode to a considered secondary station, is characterized by successive active and inactive reception periods. Usual parameters instructed by the primary station are the period of the DRX mode, and the duty cycle (or DRX ratio) being the ratio between the active reception period and the DRX mode period.
  • the combination of DRX mode with the semi persistent allocation scheme leads to a reduced flexibility of the resources. Indeed, in order to allocate resources to a secondary station, the primary station has to transmit the transmission resource indication within the active reception period. Since the allocated TTI is determined by the time of sending and decoding the indication signal delayed by a fixed offset, it is not possible to allocate all the TTIs of a sub-frame with the current scheme, if the duty cycle of the DRX mode is below 1.
  • a method for allocating resources for transmissions from a secondary station to a primary station, wherein the primary station transmits to the secondary station at least one parameter of a discontinuous reception mode comprising active and inactive reception periods, and wherein during an active reception period the primary station transmits to the secondary station an indication of a transmission resource for use by the secondary station for transmitting data to the primary station, wherein the indication of the transmission resource indicates at least one selected transmission resource out of a set of transmission resources and further comprises an indication of a time offset from the indication of the at least one transmission resource.
  • the primary station can assign a TTI which is not compulsorily after the usual fixed offset. Then, the flexibility of the method for allocating resources is improved and the primary station can assign resources independently of the active reception period.
  • the present invention also relates to a primary station comprising means for carrying the method in accordance with the invention.
  • a secondary station comprising means for carrying out the method in accordance with the first aspect of the invention.
  • Fig.l is a block diagram of a system comprising a primary station and a secondary in accordance with the invention
  • Fig.2 is a time chart representing the signals transmitted in accordance with a conventional method
  • Fig.3 is a time chart representing the signals transmitted in accordance with the invention
  • - Fig.4 is a flow chart representing schematically the method in accordance with an embodiment of the invention.
  • the present invention relates to a communication system 300 as depicted in Fig.l, comprising a primary station 100, like a base station, and at least one secondary station 200 like a mobile station.
  • the radio system 300 may comprise a plurality of the primary stations 100 and/or a plurality of secondary stations 200 (also noted UE).
  • the primary station 100 comprises a transmitter means 110 and a receiving means 120.
  • An output of the transmitter means 110 and an input of the receiving means 120 are coupled to an antenna 130 by a coupling means 140, which may be for example a circulator or a changeover switch.
  • Coupled to the transmitter means 110 and receiving means 120 is a control means 150, which may be for example a processor.
  • the secondary station 200 comprises a transmitter means 210 and a receiving means 220.
  • An output of the transmitter means 210 and an input of the receiving means 220 are coupled to an antenna 230 by a coupling means 240, which may be for example a circulator or a changeover switch.
  • the UE In the uplink the UE has to monitor the L1/L2 control information to decode and detect if its own C-RNTI is present. This is required because when the network allocates UL resources it typically sends a Resource Allocation (RA) on the L1/L2 downlink control channels: the default allocation of time and frequency resource (if there is one) may be overridden by a new allocation signalled in the L1/L2 control channel, or the Ll /L2 control channel may be used to schedule uplink resources in response to a request from the UE.
  • the resource allocation typically contains an indication of the frequency resource and the Modulation Coding Scheme (MCS) that the UE should use for the uplink transmission.
  • MCS Modulation Coding Scheme
  • the secondary station 200 in the case where discontinuous reception (or DRX) is not used (i.e. DRX duty cycle of 1), the secondary station 200 signals a request for uplink resources with the data in the 'request' labelled packet.
  • This request is received by a primary station which will decide when to send a L1/L2 control signal back to the secondary station 200.
  • the timing of this signal is determined by the network, knowing that the secondary station will use a specific time slot defined by a fixed offset from the point at when the secondary station receives and decodes the control signalling.
  • This offset is typically a pre-defined offset, or may be signalled to the secondary station by for example RRC signalling.
  • a DRX cycle can be configured such that the secondary station can receive a downlink signal only during the active period of a DRX cycle.
  • the downlink signals include: cell broadcast signals on BCH, ACK/NACK in DL, L1/L2 control channel, data on DL-SCH, etc.
  • the operation of DRX will therefore reduce the flexibility with which the UE can receive L1/L2 downlink control information. This reduced flexibility will mean that there is a reduced flexibility for the primary station to determine at what point in time a particular secondary station can use an Uplink radio resource.
  • DRX is used by the secondary station 200 according to a DRX cycle configured by the primary station 100.
  • the DRX cycle might only allow the UE to listen to one out of every 6 TTI time slots, as shown.
  • the fixed time offset between the L1/L2 control signalling and the corresponding UL resources means that the network does not have full flexibility as to when it can direct the UE to use an uplink resource: in this example, only one in six uplink transmission opportunities can be used. This reduces scheduling flexibility between UEs, as different UEs cannot use the same uplink resources.
  • the network can send some indication of timing offset together with the L1/L2 control information.
  • This information is shown with the dotted box in the RA box.
  • the extra information on timing offset is used by the secondary station to determine the exact timing offset that the UE can use when transmitting the uplink data.
  • Two examples of valid TTIs are shown with box 1 or box 2.
  • the amount of extra information included in the L1/L2 control signalling could vary depending on the DRX cycle parameters configured for the UE. For example more timing control may be required if the DRX cycle is configured in such a way that the UE only listens for DL control signals for short "on" subframes, with long "off subframes. This is the case for instance if the duty cycle is least than 1. In this case more bits may be used in the L1/L2 control signals to indicate finer control of the actual timing offset that the UE is required to use.
  • the network may also configure the set of timing offsets available to each UE using higher layer signalling to convey this information.
  • the extra information bits in the L1/L2 control signalling indicating the timing offset could indicate an index to a timing offset value in a set of timing offset values preconfigured by the higher layer signalling. This would allow the network to organise the use of resources in such a way as to avoid potential conflicts between UEs while at the same time minimising transmission delays.
  • One (or more) of the set of timing offsets could be fixed, taking for example a default value, which could be the same timing as without a DRX cycle.
  • the set of timing offsets which are available to be indicated to the UE could be conveyed explicitly by RRC signalling or at least partly implicitly, for example being dependent on the length of the DRX cycle. It should be noted that there is no need to allow an offset longer than the length of the DRX cycle.
  • Timing offset values could be configured for different UEs by higher layer signalling.
  • Non Real Time (NRT) services if the L1/L2 control information can signal an allocation to the secondary station, then the secondary station should go to non-DRX mode, immediately returning the full flexibility of uplink resource allocation to the network.
  • NRT Non Real Time
  • the use of extra L1/L2 control information can also allow the continued use of long DRX cycles whilst maintaining full uplink resource allocation control.
  • full flexibility of uplink resource allocation may be retained.
  • the DRX cycle comprises one "on" subframe out of N subframes.
  • the timing offset information can signal N possible timing offsets, any uplink subframe can still be used for transmission.
  • the number of bits of timing offset information required to retain full flexibility of uplink resource allocation would be
  • the UE may determine the format of the L1/L2 control signalling (and hence how to decode it) without explicit signalling to indicate the format.
  • the fixed time offset between the L1/L2 control signalling and the corresponding UL resources means that the network does not have full flexibility as to when it can direct the UE to use an uplink resource. This flexibility can be regained by allowing the network to send some indication of timing offset together with the L1/L2 control information.
  • the amount of extra information included in the Ll /L2 control signalling could vary depending on the DRX cycle parameters configured for the UE.
  • a method illustrated on Fig.4 is carried out in the system 300.
  • the primary station 100 sends to the secondary station 200 DRX parameters like the period and/or the duty cycle, or similar.
  • the secondary station 200 may send a request for a transmission allocation resource. Then, the primary station 100 computes when the next active reception of the secondary station will occur and compute the time offset for indicating the TTI allocated to the secondary station 200, and transmits a corresponding allocation message at step S 102.
  • the allocation message is received by the secondary station 200 during its active reception period.
  • the secondary station 200 will then compute the allocated TTI based on the time of reception of the allocation message with an offset corresponding to the one indicated in the allocation message, and transmits at step S 104 during the computed TTI the data.
  • the primary station may include several TTIs corresponding to the successive allocated TTIs in the respective sub frames, during which the secondary station will stay in an inactive reception mode, so that the secondary station is able to transmit in every frame without reducing its DRX period.
  • the secondary station can save power, but has still opportunities for transmitting its data. This can be implemented by indicating only an offset compared with a predetermined TTI in each subframe. For reducing the overhead, the number of bits on which is indicated the successive offsets may be low.
  • the secondary station benefits of the DRX mode and can still transmit.

Abstract

Cette invention concerne un procédé permettant d'attribuer des ressources pour des transmissions depuis une station secondaire vers une station primaire. Selon ce mode de réalisation, la station primaire transmet à la station secondaire au moins un paramètre d'un mode de réception discontinu comprenant des périodes de réception actives et inactives. Pendant une période de réception active, la station primaire transmet à la station secondaire une indication d'une ressource de transmission utilisée par la station secondaire pour transmettre les données à la station primaire. L'indication de la ressource de transmission indique au moins une ressource de transmission sélectionnée dans un ensemble de ressources de transmission; l'indication comprend également une indication d'un décalage temporel depuis l'indication d'au moins une ressource de transmission.
PCT/IB2008/052310 2007-06-20 2008-06-11 Procédé permettant d'attribuer des ressources de transmission dans un système de télécommunication, station primaire et station secondaire permettant la mise en oeuvre d'un tel procédé WO2008155689A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP07301137.1 2007-06-20
EP07301137 2007-06-20
EP07301429 2007-10-03
EP07301429.2 2007-10-03

Publications (2)

Publication Number Publication Date
WO2008155689A2 true WO2008155689A2 (fr) 2008-12-24
WO2008155689A3 WO2008155689A3 (fr) 2009-02-19

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PCT/IB2008/052310 WO2008155689A2 (fr) 2007-06-20 2008-06-11 Procédé permettant d'attribuer des ressources de transmission dans un système de télécommunication, station primaire et station secondaire permettant la mise en oeuvre d'un tel procédé

Country Status (2)

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TW (1) TW200917706A (fr)
WO (1) WO2008155689A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006114710A2 (fr) * 2005-02-28 2006-11-02 Nokia Corporation Reception/transmission discontinue dans un systeme de communications
WO2007025138A2 (fr) * 2005-08-26 2007-03-01 Qualcomm Incorporated Procede et appareil de communication par paquet dans des systemes sans fil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006114710A2 (fr) * 2005-02-28 2006-11-02 Nokia Corporation Reception/transmission discontinue dans un systeme de communications
WO2007025138A2 (fr) * 2005-08-26 2007-03-01 Qualcomm Incorporated Procede et appareil de communication par paquet dans des systemes sans fil

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
3GPP TSG-RAN WG2 MEETING N 54: "Uplink DPCCH gating, general description" 3RD GENERATION PARTNERSHIP PROJECT (3GPP); TECHNICALSPECIFICATION GROUP (TSG) RADIO ACCESS NETWORK (RAN); WORKINGGROUP 2 (WG2), XX, XX, [Online] no. R2-062202, pages 1-6, XP002483131 Retrieved from the Internet: URL:www.3gpp.org> [retrieved on 2006-09-01] *
NOKIA SIEMENS NETWORKS: "Update on Mobility, Security, Random Access Procedure, etc ..." 3GPP TSG-RAN WG2 #58, R2-072338, [Online] 7 May 2007 (2007-05-07), - 11 May 2007 (2007-05-11) pages 1-41, XP002504519 Retrieved from the Internet: URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_58/Documents/> [retrieved on 2008-11-18] *
PHILIPS: "Operation of E-UTRAN UL Scheduling and DRX" 3GPP TSG-RAN WG2 #58BIS, R2-072504, [Online] 25 June 2007 (2007-06-25), - 29 June 2207 (2207-06-29) pages 1-3, XP002504520 Retrieved from the Internet: URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_58bis/Docs/> [retrieved on 2008-11-18] *

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Publication number Publication date
TW200917706A (en) 2009-04-16
WO2008155689A3 (fr) 2009-02-19

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