WO2011069561A1 - Transmissions de données synchronisées - Google Patents

Transmissions de données synchronisées Download PDF

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Publication number
WO2011069561A1
WO2011069561A1 PCT/EP2009/066992 EP2009066992W WO2011069561A1 WO 2011069561 A1 WO2011069561 A1 WO 2011069561A1 EP 2009066992 W EP2009066992 W EP 2009066992W WO 2011069561 A1 WO2011069561 A1 WO 2011069561A1
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WO
WIPO (PCT)
Prior art keywords
data
synchronisation
accordance
transmission
scheduled
Prior art date
Application number
PCT/EP2009/066992
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English (en)
Inventor
Kalle Petteri Kela
Original Assignee
Nokia Corporation
Eerolainen, Lauri Johannes
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 Nokia Corporation, Eerolainen, Lauri Johannes filed Critical Nokia Corporation
Priority to PCT/EP2009/066992 priority Critical patent/WO2011069561A1/fr
Publication of WO2011069561A1 publication Critical patent/WO2011069561A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the invention relates to transmission of data, and more particularly to transmission of data in a time synchronised system.
  • Data can be received and/or transmitted via a communication system or communicated directly between users by means of appropriate communication devices.
  • a communication device is provided with an appropriate signal receiving and transmitting apparatus for enabling the communications.
  • a communication device can thus be seen as a facility that enables communication sessions between two or more parties. For example, communications of data on wireless interfaces between mobile communication devices and base stations and/or other stations can be provided.
  • a communication device of a user is often referred to as user equipment (UE).
  • the communications may comprise, for example, communication of data such as audio data, electronic mail (email), text messages, multimedia, other data and so on.
  • Users may be offered and provided numerous services via their communication devices. Non-limiting examples of these services include two-way or multi-way calls, data communication or multimedia services or simply an access to a data communications network system, such as the Internet.
  • a communication system facilitating data communications can be provided for example by means of a communication network and one or more compatible communication devices.
  • the communication network may be a large network proving nationwide cover, continent wide cover or even global cover, or be provided by a local network.
  • a wireless communication system at least a part of communications between at least two stations occurs over a wireless link.
  • wireless systems include public land mobile networks (PLMN), satellite based communication systems and different wireless local networks, for example wireless local area networks (WLAN).
  • PLMN public land mobile networks
  • WLAN wireless local area networks
  • a user can access the communication system via an access system thereof.
  • the access system can be provided, for example, by a base station or a group of base stations and associated controllers.
  • a communication system and associated devices typically operate in accordance with a given standard and/or specifications which set out what the various entities associated with the system are permitted to do and how that should be achieved.
  • Communication protocols and/or parameters which shall be used for the connection are also typically defined.
  • the multiplexing techniques and/or the type or types of the access technology compatible communication devices shall use can be defined.
  • a more detailed example of standards and protocols relates to the way how the communications are timed and how to synchronise the timing between various devices in a communication system.
  • the commonly accepted 'rules' for providing synchronisation enable a communication device to be synchronized in time with the other party of the communication, typically a base station of a communication network or another user device, and maintaining of the synchronisation without a need for the user of the device to take any action,
  • the synchronisation procedures typically set various requirements and tasks for the communicating devices to achieve this.
  • the third generation partnership project (3GPP) access network specifications require that user equipment flushes all hybrid automatic retransmission request (HARQ) buffers thereof and clears all configured downlink assignments and uplink grants after expiry of a time alignment timer.
  • 3GPP third generation partnership project
  • Embodiments of the invention aim to address one or several of the above issues.
  • a method comprising transmitting data from a device in a time synchronized system, determining possibility of invalid time synchronisation, pausing transmission of data from the device, buffering data scheduled for transmission into at least one memory of the device, the at least one memory being configured for storing data for the purposes of responding retransmission requests, and in response to subsequent determination that time synchronisation of the device is valid, continuing transmission of data, receiving at least one request for retransmission of at least some of the buffered data, and responding the request by transmitting data from the at least one memory.
  • a method comprising receiving data from a transmitting device in a time synchronized system, determining an irregularity in time synchronisation with the transmitting device, sending timing information to the transmitting device, successfully receiving data from the transmitting device, determining that at least some data scheduled for transmission during the irregularity has not been received, sending at least one request for retransmission of said non- received data, and receiving in response data from at least one memory for storing data for the purposes of responding retransmission requests and configured to store data scheduled for transmission during possible timing synchronisation irregularities.
  • an apparatus comprising means for controlling transmission of data in a time synchronized system, the means for controlling being configured to determine a possibility of invalid time synchronisation and in response thereto to cause pausing the transmission of data and to subsequently determine that the time synchronisation is valid and in response to determination of valid time synchronisation to cause continuation of the transmission of data, means for buffering data scheduled for transmission, the means for buffering being configured to store data for the purposes of responding retransmission requests, wherein the means for controlling are further configured to cause buffering of unsent scheduled data in the means for buffering, and means for handling retransmission requests, the means for handling retransmission request being configured to receive at least one request for retransmission of at least some of the buffered unsent scheduled data and to respond the request by causing sending of data from the means for buffering.
  • an apparatus comprising controller means for determining irregularity in time synchronization with a transmitting device, for causing sending of timing information to the transmitting device, for determining that reception of data from the transmitting device is continued, for determining that at least some data scheduled for transmission by the transmitting device has not been received, for causing sending of at least one request for retransmission of said non-received data, and for processing data received in response to said at least one request for retransmission from at least one memory configured to store data scheduled for transmission during possible timing synchronisation irregularities.
  • an apparatus comprising at least one processor, and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to control transmission of data in a time synchronized system, to determine a possibility of invalid time synchronisation, and in response to determination that the synchronisation is possibly invalid, to cause pausing of said transmission of data and buffering of data scheduled for transmission into at least one memory configured for storing data for the purposes of responding retransmission requests, and in response to a subsequent determination that time synchronisation is valid, to cause continuation of the transmission of data, and to handle at least one received request for retransmission of at least some of the buffered scheduled data by causing sending of said requested buffered scheduled data.
  • an apparatus comprising at least one processor and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to control receiving of data from a transmitting device in a time synchronized system, to detect an irregularity in the time synchronisation and subsequently to send timing information to the transmitting device, to determine that at least some data scheduled for transmission by the transmitting device during the irregularity has not been received, to cause sending of at least one request for retransmission of said non-received data, and to receive, in response to said at least one request, data from at least one memory configured to store data scheduled for transmission during possible timing synchronisation irregularities.
  • the possibility of invalid time synchronisation or irregularity is determined based on expiry of a synchronisation timer.
  • the synchronisation timer can comprise a time alignment timer.
  • Instructions to save the data scheduled for transmission in case of invalid time synchronisation may be communicated from a receiving device to a transmitting device.
  • the instructions may be communicated in a radio resource control message. According to a possibility the buffering of data scheduled for transmission is a mandatory response to the determining of possibly invalid time synchronisation.
  • Validity of the time synchronisation may be determined based on timing information provided by the receiving device.
  • the timing information may comprise a timing advance command.
  • the retransmission requests may comprise hybrid automatic retransmission requests (HARQs).
  • the buffering may comprise storing medium access control protocol data units for already configured uplink grants to a HARQ buffer after expiry of a time alignment timer.
  • the transmitting device may be disabled by causing an irregularity in timing by belated communication of timing information.
  • a computer program comprising program code means adapted to perform one or more of the herein disclosed methods is also provided.
  • the computer executable program code components can be stored on a computer-readable storage medium.
  • Figure 1 shows an example of a communication system wherein below described examples of the invention may be implemented
  • Figure 2 shows an example of a communication device
  • Figures 3 and 4 are flowcharts illustrating exemplary embodiments; and Figures 5A and 5B show a further example.
  • certain exemplifying embodiments are explained with reference to wireless or mobile communication systems where fixedly positioned base stations serve mobile communication devices.
  • certain general principles of wireless or mobile communication systems are briefly explained with reference to Figures 1 and 2 to assist in understanding the context of the herein described examples.
  • a mobile communication device can be used for accessing various services and/or applications provided via a communication system.
  • wireless or mobile communication systems wireless interfaces can be provided between mobile communication devices 1 and other stations. More particularly, in the Figure 1 example mobile communication devices 1 are provided wireless access via a base station 12 or similar wireless transmitter and/or receiver node of an access system 10.
  • Each mobile communication device 1 and base station 12 may have one or more channels or subchannels open at the same time and may receive signals from more than one source, it is noted that although only one access system 10 is shown in Figure 1 , a number of access systems, such as radio access networks, can be provided, and that a mobile communication device may move from an access system to another.
  • An access system and a base station thereof are typically controlled by at least one appropriate controller so as to enable operation thereof and management of mobile communication devices in communication with the base station.
  • the control apparatus can be interconnected with other control entities.
  • a controller is shown to be provided by block 13.
  • a control apparatus for a base station is typically provided with memory capability 15 and at least one data processor 14. It shall be understood that the control apparatus and functions may be distributed between a plurality of controller units.
  • the control apparatus 13 can be arranged to provide control on communications by roaming mobile communication devices that have entered the area of the access system.
  • the control apparatus 13 can be configured to execute an appropriate software code to provide the control functions as explained below where more detailed examples for different control functions to provide and maintain synchronisation are given.
  • LTE Long-term evolution
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • 3GPP 3rd Generation Partnership Project
  • LTE-A LTE-Advanced
  • radio access systems include those provided by base stations of access systems that are based on technologies such as wireless local area network (WLAN) and/or WiMax (Worldwide Interoperability for Microwave Access).
  • WLAN wireless local area network
  • WiMax Worldwide Interoperability for Microwave Access
  • An example of a base station of an access system is the NodeB or enhanced NodeB (eNB) as defined by the 3GPP specifications.
  • FIG. 1 the access system 10 is connected to a wider communications network 16, sometimes referred to as the core network.
  • a communication system may be provided by one or more of such networks and the elements thereof.
  • One or more gateways may be provided for interconnecting the different networks.
  • Figure 2 shows a schematic, partially sectioned view of a communication device 1 that can be used for communication with a communication system and/or other mobile communication devices.
  • An appropriate mobile communication device may be provided by any device capable of sending and receiving wireless signals. Non-limiting examples include a mobile station (MS), a portable computer provided with a wireless interface card or other wireless interface facility, personal data assistant (PDA) provided with wireless communication capabilities, or any combinations of these or the like.
  • a mobile communication device may be used for voice and video calls, for accessing service applications and so on.
  • the mobile device 1 may receive signals over an air interface 11 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting signals.
  • a transceiver component is designated schematically by block 7.
  • the transceiver apparatus may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobile device.
  • Appropriate modem apparatus 9 is also provided to enable modulation and demodulation of wireless signals.
  • a communication device is also typically provided with at least one data processing entity 3, at least one memory 4 and other possible components for use in software aided execution of tasks it is designed to perform.
  • Such tasks include control of access to and communications with other parties, such as access systems and/or other communication devices and timing of the communications,
  • the data processing, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 6.
  • the user may control the operation of the mobile device by means of a suitable user interface such as key pad 2, voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display 5, a speaker and a microphone are also typically provided.
  • a mobile communication device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories and peripherals, for example hands-free equipment, thereto.
  • the communication devices may need to be able to synchronize to frame timing of the access network. In practice this means that each mobile device 1 should know the exact time when it can receive data from the base station (BS) 12 and the exact time when it can transmit data to the base station.
  • a functionality of the control apparatus 13 at the communication system side is to maintain common system features such as the timing or clock of the system.
  • the control apparatus can transmit information of the timing and/or specific synchronisation or reference signals to the mobile communication devices.
  • the communication devices 1 can synchronize themselves with the system based on these signals. If a mobile device is moving, the signal propagation delay between the device and the base station may change, and therefore the timing of reception and transmission of signals may need to be adjusted from time to time.
  • a mobile device can have the responsibility of autonomously maintaining downlink (DL) and uplink (UL) timing towards the network.
  • DL downlink
  • UL uplink
  • the 3GPP standard sets certain restrictions on autonomous uplink timing adjustments and rate thereof. If the mobile device moves rapidly the procedure of autonomously maintaining the timing may not be adequate in all situations.
  • the EUTRAN system can update the uplink reference timing of the mobile device by signalling a new reference time to the mobile device.
  • the new uplink timing can be signalled, for example, in a message such as Timing Advance Command (TAC).
  • TAC Timing Advance Command
  • Time Alignment Timer Such a timer is denoted by timer 8 of a synchronisation block in Figure 2.
  • a time alignment timer and the relevant control software/hardware can be configured such that it triggers in situations where uplink synchronization is deemed to be lost.
  • the time alignment timer can be re-started in response receiving new uplink timing from the base station.
  • timer 8 can be re-started in response to a new Timing Advance Command (TAC). If the new timing information is not signalled before timer 8 expires, the mobile communication device 1 can be configured to assume that the uplink timing is invalid, and can take appropriate action, for example cancel all uplink data transmissions.
  • TAC Timing Advance Command
  • EUTRAN employs hybrid automatic retransmission request (HARQ) for uplink data transfer. More particularly, the hybrid automatic retransmission request (HARQ) is provided for Layer 1 (L1) of the layered model by means of synchronous 8-process Stop-And-Wait HARQ.
  • the purpose of the retransmission functionality is to ensure reliable data delivery between the layer 1 entities in the mobile device and the base station.
  • the mobile device can maintain at least one hybrid automatic retransmission request (HARQ) buffer for transmitted data.
  • This buffer is denoted by 20 in Figure 2.
  • An appropriate network entity for example a base station, can request for re-transmissions of all or part of the data it received incorrectly or did not receive at ail. As the data subject to a re-transmission request is saved in the at least one buffer, it is readily available and can be sent in response to the request to the base station from the mobile communication device 1.
  • a requirement by the 3GPP specifications for EUTRAN is that the mobile device shall flush the HARQ buffer 20 if the time alignment timer 8 expires. Therefore, when the control apparatus of the mobile device 1 determines that the synchronisation of uplink timing has been lost it should discard all ongoing uplink transmissions. On the layer 1 entity level data transmission is currently considered as being failed for all data that is stored in the HARQ buffer.
  • Such immediate HARQ flush procedure may not be adequate in all situations. For example, an immediate flush may not be adequate in a situation where the timing synchronisation may not have been lost after all, despite it can look like that, and thus the mobile device may be reacting too hard on what might only be a possible, but non-confirmed loss of synchronisation.
  • the network may just be late in updating the timing advance command, or the command has been lost, before the expiry of the synchronisation timer 8 in the mobile device 1 , and thus the timing may be still valid. Despite this the control procedure can act on the trigger by the timer as if the synchronisation had been lost.
  • the current 3GPP specifications also define that a mobile device can apply a late timing advance command after the expiry of the timing advance timer. Therefore the 3GPP specifications do not, strictly speaking, prevent arrangements where uplink timing can be recovered after the expiry of the time alignment timer.
  • the following examples illustrate in more detail how it is possible to continue the uplink HARQ data retransmission process after the timing has been recovered, or it has been detected that the timing was not lost in the first place, and thus avoid flushing of the HARQ buffers at the expiry of the time alignment timer or because of some other reasons which make it look like that there are irregularities in the time synchronisation.
  • a device transmits data in a time synchronized system at 100. It can be determined at 102 that there is a possibility of invalid time synchronisation. For example, the determination may be made in response to expiry of a synchronisation timer. If no loss of synchronisation is detected, the data transmission continues at 100. If it is determined at 102 that synchronisation is lost, the transmitting device can pause transmission of data at 104. Whilst the transmission is paused, the transmitting device can buffer data that is scheduled for transmission into at least one memory of the device at 106. The memory can be one that is typicaily used for storing data for the purposes of responding retransmission requests.
  • time synchronisation of the device is again valid, where after transmission of data in the time synchronized system can be continued at 110.
  • the determination at step 108 can be, for example, made based on reception of valid timing information or in response to detection that he timing was not lost in the first place.
  • the device can then receive at 112 at least one request for retransmission of at least some of the data buffered at 106. In response to the request data is transmitted from the at least one memory to the requesting party at 114.
  • the buffering at 106 may be triggered based on instructions to save the data scheduled for transmission instead of flushing it.
  • the instructions can be sent by the receiving device, or another entity providing at least partial control on the communications links between the two devices.
  • buffering of data scheduled for transmission in response to detection of an irregularity in synchronisation may be defined as a mandatory operation.
  • the transmitting device shall, for example, always buffer the scheduled data in response to determining at 102 that the time synchronisation is invalid based on expiry of a time alignment timer.
  • FIG. 4 is a flowchart illustrating an example for operation at the receiving side of a transmitter-receiver pair.
  • data is received from a transmitting device in a time synchronized system. Irregularities in time synchronisation between the devices can be monitored at 121. If no irregularity such as real or potential loss of synchronisation is detected, the operation and data reception continues at 120. However, if it is determined at 121 that the relevant time synchronisation is not valid and/or that no data is received and thus the reception of data is discontinued. According to a possibility it can be determined that sending of a timing update to the transmitting device is needed. For example, although a loss of synchronisation is not detected, it can be determined that the previous timing synchronisation message is lost, delayed or that an update of the timing information is needed for some other reason.
  • the reception of data may stop as nothing is sent by the transmitting device if it has paused data transmission in response to assumed or real loss of synchronisation.
  • the receiving station can determine that the transmission is paused based on various indicators. For example, a receiving station such as a base station may be aware of the transmitting devices uplink buffer status based on received buffer status reports. If a synchronisation timer, for example a time alignment timer, of the base station expires and it is aware that there is data in the buffers of the downlink device, the base station can be allowed to sent or resend timing information on the downlink. The base station may also detect that timing information was sent but the transmitting device still does not send any data, in which case the base station may send/resend the timing information,.
  • a synchronisation timer for example a time alignment timer
  • timing information can be sent or resent at 122 to the transmitting device.
  • the receiving device can determine that at least some data that was scheduled for transmission has not been received during the irregularity at 124. Either before, at the same time or after this determining the receiving device can also determine that the time synchronisation is again valid. For example, the receiving station can assume that the synchronisation is in order once it starts again receiving data from the transmitting device at 123.
  • the receiving device determines at 124 that not all scheduled data was received, it can send at least one request for retransmission of said non- received data from at least one memory of the device at 128.
  • One or more responses to the request can then be received 130, the response(s) containing at least one data unit from a memory of the transmitting device for storing data for retransmission purposes.
  • a base station can detect at 124 that not all uplink data corresponding to scheduled uplink allocations is received and request for retransmission of missing data. According to a possibility the base station can ignore all uplink transmissions after expiry of a synchronisation timer and request retransmissions for all uplink data allocations after the expiry.
  • the synchronization can be considered as being recovered.
  • reception of data can also continued in the normal manner at 126 in the time synchronized system.
  • the communication device can store medium access control protocol data units (MAC PDUs) for the already configured uplink grants to an uplink HARQ buffer 20 thereof without transmission and freeze the uplink HARQ buffer until it is determined that the uplink timing is again valid.
  • MAC PDUs medium access control protocol data units
  • the storage can be provided by means of the same buffer memory as used for arrangements where the buffer is flushed by configuring the buffer control software such that the buffer 20 does not become automatically flushed in response to expiry of the synchronisation timer 8.
  • the buffering may be made to be a mandatory response to the expiry of the timer.
  • the base station may be configured to instruct the mobile device to save the HARQ buffers instead of flushing it when the time alignment timer expires.
  • Such an instruction may be sent beforehand, for example when a communication device enters the area of a base station.
  • the configuration of the downlink device how to act when the time alignment timer expires can be provided, for example, by means of radio resource control (RRC) parameters.
  • RRC radio resource control
  • time alignment timer expiry recovery actions can be simply enabled/disabled with a single configuration bit.
  • a base station can send acknowledgement without uplink grant for all HARQ processes during periods without valid uplink timing. If the transmitting device receives acknowledgements without uplink grant for only certain HARQ process, this servers as a trigger for buffering in the HARQ buffer for the purposes of subsequent retransmission requests. Buffering of the data instead of discarding it allows for utilisation of belatedly received timing information, for example a late timing advance command.
  • the base station can recover the 'paused' uplink transmissions by sending a retransmission requests for those transmissions the communication device cancelled and which the base station did hence not ever even receive. By means of this uplink transmissions can be continued seamlessly, even if the data is received a bit later, despite the synchronisation timer having been expired.
  • the earlier subframes are denoted as n-1 , n- 2, n-3 and so forth, as shown in the table of Figure 5B, and the subsequent subframes are denoted as n+1 , n+2, and so on.
  • the downlink (DL) subframes illustrate correspondingly the scheduling of the HARQ requests in the downlink.
  • the uplink timing is considered as valid.
  • the time alignment timer of the mobile communication device expires, and therefore there is no uplink timing starting from frame UL HARQ ID 6.
  • the mobile communication device can freeze HARQ buffering. That is, if a time alignment timer expires at 41 the communication device can cancel, for configured uplink grants, transmissions while storing corresponding unsent UL MAC PDUs to a HARQ buffer thereof.
  • the communication device can also take some other actions, such as cancel all uplink assignments until uplink timing is valid, and clear any configured downlink assignments.
  • the communication device can then receive at time 42 a downlink MAC PDU 2 from the base station carrying a new timing advance command (TAC) in downlink subframe n.
  • Sending of a TAC can be triggered, for example, based on timing measurements in the network side, when a time alignment timer (TAT) timer expires in the network side, or if no data was received even though a TAC was updated.
  • TAC timing advance command
  • the received timing information is to be applied starting from the uplink subframe n+6. Therefore the communication device will now have a valid uplink timing for this subframe, and for the subsequent subframes n+7, n+8 and so forth.
  • the time alignment timer can be restarted at 43.
  • the transmissions can be continued at 45.
  • the base station can determine the timing to be valid since it is again receiving retransmissions and/or new data successfully from the downlink device. Once uplink timing is valid, the base station can request for new transmissions and recover from the timer expiry by sending requests for retransmissions corresponding to those scheduled transmissions it did not receive as they were cancelled due to the timer expiry, that is for subframes n to n+2.
  • Non-adaptive retransmission can be triggered with sending of a non-acknowledgement (NACK) message on physical hybrid ARQ indication channel (PHICH).
  • NACK non-acknowledgement
  • PHICH physical hybrid ARQ indication channel
  • the base station can transmit, during period without valid uplink timing, ACK on the PHICH (with no uplink grant on the PDCCH) for all uplink HARQ processes to avoid unnecessary retransmissions.
  • the MAC PDU for n+2 can then be received at 47 on physical uplink shared channel (PUSCH) in uplink subframe n+10.
  • the MAC PDU for n can then be received at 50 in uplink subframe n+16.
  • the MAC PDU for n+1 can then be received at 51 in uplink subframe n+17.
  • a base station may send uplink allocations for uplink subframes without valid uplink timing.
  • a time alignment timer expiry for a certain communication device and new data allocations has been sent for subframes n+3, n+4 and n+5
  • retransmissions may then be requested also for those subframes.
  • a Stop-and-Wait type HARQ is used there should not be, in typical situations, new allocations before data is received from the HARQ buffer of the transmitting device after the timing is valid again.
  • a communication device may receive new uplink allocations in during the period of timing irregularity.
  • the communication device may buffer also data that scheduled data, for example the corresponding protocol data unit or units to a corresponding HARQ buffer.
  • the above described exemplifying embodiments can provide advantage in that the packet latency can be made lower than in solutions where the retransmission buffer is discarded if it is determined that the synchronisation is lost. In some occasions advantage may be obtained since re-transmissions above MAC layer may not be needed because uplink data has not been immediately discarded. Certain embodiments also enable disablement of certain transmitting devices for short periods by delaying sending of timing information, for example delaying sending of timing advance command, transmission.
  • the computations and other functions of the apparatus may be provided by means of an appropriate circuit or circuits and/or one or more data processors.
  • the described functions may be provided by separate processors or by an integrated processor.
  • the data processing may be distributed across several data processing modules.
  • a data processor may be provided by means of, for example, at least one chip. Appropriate memory capacity can also be provided in the relevant control apparatus.
  • An appropriately adapted computer program code product or products may be used for implementing the embodiments, when loaded on an appropriate data processing apparatus, for example in a data processing apparatus of the mobile communication device 1 of Figure 2 and/or in the control apparatus of the base station of Figure 1.
  • the program code product for providing the operation may be stored on, provided and embodied by means of an appropriate carrier medium.
  • An appropriate computer program can be embodied on a computer readable record medium. A possibility is to download the program code product via a data network. All or part of the calculations can also be implemented in an application-specific integrated circuit ASiC.
  • An application-specific integrated circuit (ASIC) is typically customized for a particular use. ASICs can include processor and memory blocks including read-only memories (ROM), random access memories (RAM), electrically erasable programmable read-only memories (EEPROM), Flash and other building blocks.

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Abstract

Pendant la transmission de données dans un système synchronisé temporellement, il peut être déterminé que la synchronisation temporelle est invalide. En réponse à cela, la transmission des données est suspendue et les données prévues pour la transmission sont mises en tampon dans au moins une mémoire du dispositif. En réponse à la détermination ultérieure du fait que la synchronisation temporelle est valide, la transmission des données est reprise. Au moins une demande de retransmission d'au moins certaines des données mises en tampon peut alors être reçue. La demande reçoit une réponse sous la forme de la transmission de données en provenance de ladite mémoire.
PCT/EP2009/066992 2009-12-11 2009-12-11 Transmissions de données synchronisées WO2011069561A1 (fr)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
US20220183083A1 (en) * 2015-01-27 2022-06-09 Kelvin Kar Kin Au System and method for transmission in a grant-free uplink transmission scheme
WO2024063460A1 (fr) * 2022-09-23 2024-03-28 엘지전자 주식회사 Procédé d'alignement temporel dans un système de communication sans fil, et dispositif associé

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