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WO2008155688A1 - Procédé d'affectation de ressources de transmission dans un système de télécommunication, et station principale et station secondaire permettant la mise en oeuvre dudit procédé - Google Patents

Procédé d'affectation de ressources de transmission dans un système de télécommunication, et station principale et station secondaire permettant la mise en oeuvre dudit procédé Download PDF

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Publication number
WO2008155688A1
WO2008155688A1 PCT/IB2008/052309 IB2008052309W WO2008155688A1 WO 2008155688 A1 WO2008155688 A1 WO 2008155688A1 IB 2008052309 W IB2008052309 W IB 2008052309W WO 2008155688 A1 WO2008155688 A1 WO 2008155688A1
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WO
WIPO (PCT)
Prior art keywords
station
secondary station
primary
allocation indicator
physical resource
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/IB2008/052309
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English (en)
Inventor
Paul Bucknell
Matthew P. J. Baker
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2008155688A1 publication Critical patent/WO2008155688A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal

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).
  • 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 structure of the state of the art UTRA is captured 3GPP TS36.300, which is available from http://www.3gpp.org, incorporated herein by reference.
  • 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 secondary station's C- RNTI is not found within the sub-frame, the secondary station will then be able to transmit its data by using its pre-assigned resources and TTI. However, typically when a secondary station makes a request for an allocation, it is possible that no allocation is available in the sub-frame for transmission for this considered secondary station. The flexibility of the semi persistent scheme has to be improved to avoid collision of uplink transmission from secondary stations.
  • Another object of the invention is to propose a method using the semi persistent scheme enabling the avoidance of collision of transmission without adding too much overhead.
  • the method comprises at the secondary station, monitoring a control channel from the at least one primary station for detecting an allocation indicator indicating a physical resource allocated to the secondary station for the said transmissions, - at the secondary station, if the allocation indicator is detected, transmitting data to the primary station by means of the indicated physical resource, if the allocation indicator is not detected, transmitting data to the primary station by means of a first predetermined physical resource, and wherein, at the primary station, if no physical resource is allocated to the secondary station, sending a wait request instead of the allocation indicator, so that the secondary station, when receiving said wait request, enters into a wait state thus preventing uplink transmission.
  • the primary station is able to indicate to the secondary station to request it to go into a wait state till the next allocation or longer. It is possible according to an embodiment to further indicate how long the secondary station has to stay in a wait state, or when a new allocation will be available. If the secondary station has requested for an available resource, the method in accordance with the invention permits thus to prevent the secondary station from requesting repeatedly for resources which are unavailable.
  • the present invention also relates to a secondary station comprising means for carrying out the method in accordance with the invention.
  • a primary station comprising means for carrying out the method in accordance with 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 time chart of the signals transmitted in accordance with the method of the invention.
  • Fig 3 is a flow chart in accordance with the invention.
  • the present invention relates to a system of communication 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.
  • 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 radio system uses a semi persistent scheme, where the secondary station 200 monitors continuously the L1/L2 control channel to check whether it can find its 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 200 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. If the secondary station 200 's C-RNTI is not found within the sub-frame, the secondary station 200 will then be able to transmit its data by using its pre-assigned resources and TTI.
  • the network can further signal that the uplink radio resource should not be used (i.e. that there is no uplink resource allocation in the corresponding uplink subframe), by sending a L1/L2 control signal that indicates that the UE cannot use any scheduled radio resource.
  • This signal or wait request asks the secondary station 200 to enter into a wait state where it will not transmit on the considered channel.
  • the effect of the invention would be that the expected transmission of uplink data is delayed until a later opportunity - either the next default allocation, or another occasion in response to additional L1/L2 control information.
  • the effect of the invention would be that the network has the ability to signal a "zero" allocation which acknowledges that the request has been received but indicates to the UE 200 that none are available. It permits thus to prevent the UE 200 from repeating the request.
  • the Primary station 100 is aware that this UE 200 needs resources, but must handle with other secondary stations, for instance having higher priority data to send.
  • the time that the UE could try again to request resources, or the time when the UE should monitor the L1/L2 control channel again could be configured to be one or multiple TTIs later than the TTI corresponding to the indication of wait request, or could be indicated in the wait request message.
  • This sending of wait requests informs the secondary station 200 that the network has received the request, as this signal acknowledges the request, but no resource is allocated.
  • One option would then be for the UE to re-send the resource allocation request in the next available UL resource allocation request time slot, but can also wait without sending this request again.
  • the advantage of allowing the network to signal to the UE that it cannot use any physical resource block to transmit in, is that the UE saves on transmit power and the network can utilise all the radio resources for other users, which may have higher- priority data to send.
  • the system is operating with persistent scheduling.
  • a default allocation allows the UE 200 to use a pre-defined PRB (physical resource block) without the need for L1/L2 control information.
  • RX - case 1 the UE 200 is transmitting regular uplink data blocks in the periodic default time/frequency resources, but is also monitoring the L1/L2 control information. If no L1/L2 control information is received for the UE it proceeds to transmit in the uplink using the pre-defined default allocation.
  • RX case -2 at TTI 8
  • a L1/L2 control signal is received which instructs the UE to use a different allocation to the default one.
  • the L1/L2 control information is used to indicate that the UE should not transmit in any uplink resources.
  • the network wait request (or no allocation) signal can be sent in response to the UE making a request for uplink resources.
  • the use of the wait request signal allows the request to be acknowledged by the network, thus avoiding the UE unnecessarily repeating the request through a misapprehension that the request had not been received.
  • the wait request message may include an indication of a time offset when uplink resources will be available, or an indication of a time offset after which the UE 200 may resend its request.
  • the system 300 uses several HARQ processes.
  • the uplink HARQ (Hybrid Automatic Repeat-reQuest) processing i.e. from the secondary stations to the primary stations, may be implemented as follows:
  • the "uplink prioritisation" entity indicates the need for a new transmission
  • obtain the MAC PDU to transmit from the "Multiplexing and assembly” entity and instruct the HARQ process corresponding to this TTI to trigger the transmission of this new payload using the identified parameters.
  • the L1/L2 control information might also be used to indicate that the specific HARQ process being used by the UE is disabled, but can use the other HARQ processes available.
  • the advantage of this "fine control" of downlink scheduling is that the network can effectively reduce the resources used by a particular UE in small steps, than by normal L1/L2 allocation control. Typically this would have the effect of disabling the transmissions in every n th TTI, where n is the total number of HARQ processes. For instance, the UE may be able to use a lower priority HARQ process instead of the current HARQ process.
  • the primary station 100 successfully decodes the packet after the initial transmission and therefore does not need a retransmission, it is beneficial for the primary station 100 to be able to send a wait message to the UE 200 to cancel the default allocation and prevent the UE 200 from wasting power sending an unnecessary retransmission.
  • the uplink resources can instead be assigned to another UE.
  • the wait request may comprise the field normally indicating the transmission time interval may take a predetermined particular value indicating that no TTI will never be allocated for this retransmission, so that the UE 200 will not to transmit this data again.
  • the secondary station 200 can make firstly a request of allocation, at step SlOO.
  • This step SlOO is not essential and may not be implemented in some variant of the invention.
  • the primary station checks the availabilities on the uplink. This is done by comparison of several parameters, as the priority of the data to be transmitted, the age of the requests of the secondary stations, or similar.
  • the secondary station 200 monitors the L1/L2 control channels.
  • the secondary station will transmit its data at step S 105 by using the pre-assigned resource.
  • allocation message data is extracted at step S 104. If these data comprises an allocation of physical resources, the secondary station 200 will use transmit data by using the dynamically allocated resource, in the TTI following the reception of the allocation message delayed by a predetermined amount, at step 106. If the data extracted comprises a wait request, the secondary station 200 will not transmit during the sub frame, at step 107.
  • an indication of a TTI is sent with the wait request, this TTI corresponding for instance to the next transmission of allocation message, and the secondary station may only monitor again the L1/L2 channels at that time.
  • the indicated TTI corresponds to an allocated TTI for the next sub frame, so that the secondary station has not to monitor again the L1/L2 channels till the next transmission.

Landscapes

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

Abstract

La présente invention concerne un procédé d'affectation de ressources permettant des transmissions entre une station secondaire et au moins une station principale. Ledit procédé consiste, au niveau de la station secondaire, à surveiller un canal de commande à partir de ladite station principale pour détecter un indicateur d'affectation indiquant une ressource physique affectée à la station secondaire pour lesdites transmissions; au niveau de la station secondaire, si l'indicateur d'affectation est détecté, à transmettre des données à la station principale au moyen de la ressource physique indiquée et, si l'indicateur d'affectation n'est pas détecté, à transmettre des données à la station principale à l'aide d'une première ressource physique prédéterminée; et, au niveau de la station principale, si aucune ressource physique n'est affectée à la station secondaire, à envoyer une demande d'attente au lieu de l'indicateur d'affectation de manière que la station secondaire puisse entrer dans un état d'attente lorsqu'elle reçoit ladite demande d'attente, empêchant ainsi la transmission en liaison montante.
PCT/IB2008/052309 2007-06-20 2008-06-11 Procédé d'affectation de ressources de transmission dans un système de télécommunication, et station principale et station secondaire permettant la mise en oeuvre dudit procédé Ceased WO2008155688A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07301136.3 2007-06-20
EP07301136 2007-06-20

Publications (1)

Publication Number Publication Date
WO2008155688A1 true WO2008155688A1 (fr) 2008-12-24

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PCT/IB2008/052309 Ceased WO2008155688A1 (fr) 2007-06-20 2008-06-11 Procédé d'affectation de ressources de transmission dans un système de télécommunication, et station principale et station secondaire permettant la mise en oeuvre dudit procédé

Country Status (2)

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TW (1) TW200917720A (fr)
WO (1) WO2008155688A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11596019B2 (en) * 2018-01-05 2023-02-28 Sharp Kabushiki Kaisha Wireless communication device and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6778509B1 (en) * 1999-11-19 2004-08-17 Hughes Electronics Corporation MAC layer protocol for a satellite based packet switched services
US7145889B1 (en) * 2002-03-28 2006-12-05 Nortel Networks Limited Efficient frame retransmission in a wireless communication environment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6778509B1 (en) * 1999-11-19 2004-08-17 Hughes Electronics Corporation MAC layer protocol for a satellite based packet switched services
US7145889B1 (en) * 2002-03-28 2006-12-05 Nortel Networks Limited Efficient frame retransmission in a wireless communication environment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11596019B2 (en) * 2018-01-05 2023-02-28 Sharp Kabushiki Kaisha Wireless communication device and method

Also Published As

Publication number Publication date
TW200917720A (en) 2009-04-16

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