WO2019192011A1 - Configuration de sauvegarde dans une procédure d'accès aléatoire - Google Patents

Configuration de sauvegarde dans une procédure d'accès aléatoire Download PDF

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Publication number
WO2019192011A1
WO2019192011A1 PCT/CN2018/082070 CN2018082070W WO2019192011A1 WO 2019192011 A1 WO2019192011 A1 WO 2019192011A1 CN 2018082070 W CN2018082070 W CN 2018082070W WO 2019192011 A1 WO2019192011 A1 WO 2019192011A1
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WO
WIPO (PCT)
Prior art keywords
backup configuration
mode
dedicated backup
random access
response
Prior art date
Application number
PCT/CN2018/082070
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English (en)
Inventor
Haitao Li
Rapeepat Ratasuk
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
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 Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to PCT/CN2018/082070 priority Critical patent/WO2019192011A1/fr
Priority to CN201880092232.0A priority patent/CN111937478B/zh
Publication of WO2019192011A1 publication Critical patent/WO2019192011A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure

Definitions

  • Embodiments of the present disclosure generally relate to the field of communications, and in particular, to a method, device and computer readable storage media for a backup configuration in a random access (RA) procedure.
  • RA random access
  • CE coverage enhancement
  • UE user equipment
  • RA random access
  • RSRP Reference Signal Receiving Power
  • the UE may select a CE level from the four CE levels based on Reference Signal Receiving Power (RSRP) measurements of a serving cell and broadcasted RSRP thresholds for these CE levels. If a RA attempt in the selected CE level has failed for several times, the UE may increase the CE level and initiate a further RA attempt in the increased CE level until the allowed maximum attempt number is reached.
  • RSRP Reference Signal Receiving Power
  • CE Mode A For RRC_CONNECTED UEs in a Radio Resource Control (RRC) connected state, two CE modes are proposed, which are referred to as CE Mode A and CE Mode B, respectively.
  • the CE Mode A corresponds to CE level 0 and CE level 1 and specifies a set of behaviors with no repetitions or a small number of repetitions.
  • the CE Mode B corresponds to CE level 2 and CE level 3 and specifies a further set of behaviors with a large number of repetitions.
  • the specific CE mode may be explicitly configured to a UE via dedicated RRC signaling.
  • the UE may also increase the CE level after the RA attempt in the lower CE level failed.
  • the increasing of the CE level may span different CE modes. For example, if the RA attempt in the CE mode A failed, the UE may switch to the CE level 2 or 3 for the CE mode B to initiate a further RA attempt.
  • example embodiments of the present disclosure provide a method, device and computer readable storage media for a backup configuration in a RA procedure.
  • a method at a terminal device is provided.
  • the terminal device is configured with a first CE mode.
  • the terminal device initiates a random access procedure in a second CE mode different from the first CE mode.
  • the terminal device determines whether a dedicated backup configuration is enabled. If it is determined that the dedicated backup configuration is enabled, the terminal device detects a message from a network device by using the dedicated backup configuration.
  • a device comprising at least one processor and at least one memory including computer program code.
  • the at least one memory and the computer program code are configured to, with the at least one processor, cause the device to:initiate a random access procedure in a second CE mode different from a first CE mode that is configured; and during the random access procedure, determine whether a dedicated backup configuration is enabled, and in response to determining that the dedicated backup configuration is enabled, detect a message from a network device by using the dedicated backup configuration.
  • a computer readable storage medium that stores a computer program thereon.
  • the computer program when executed by a processor, causes the processor to carry out the method according to the first aspect.
  • FIG. 1 illustrates an example interaction process between a terminal device and a network device in a conventional RA procedure
  • FIG. 2 illustrates an example communication network in which embodiments of the present disclosure can be implemented
  • FIG. 3 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure.
  • FIG. 4 illustrates a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • the term “communication network” refers to a network that follows any suitable communication standards or protocols such as long term evolution (LTE) , LTE-Advanced (LTE-A) and 5G NR, and employs any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO) , OFDM, time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, machine type communication (MTC) , eMBB, mMTC and uRLLC technologies.
  • MIMO Multiple-Input Multiple-Output
  • OFDM time division multiplexing
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • Bluetooth ZigBee
  • ZigBee machine type communication
  • MTC machine type communication
  • eMBB eMBB
  • mMTC uRLLC technologies.
  • the term “network device” refers to any suitable device at a network side of a communication network.
  • the network device may include any suitable device in an access network of the communication network, for example, including a base station (BS) , a relay, an access point (AP) , a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a gigabit NodeB (gNB) , a Remote Radio Module (RRU) , a radio header (RH) , a remote radio head (RRH) , a low power node such as a femto, a pico, and the like.
  • the eNB is taken as an example of the network device.
  • the term “terminal device” refers to a device capable of, configured for, arranged for, and/or operable for communications with a network device or a further terminal device in a communication network.
  • the communications may involve transmitting and/or receiving wireless signals using electromagnetic signals, radio waves, infrared signals, and/or other types of signals suitable for conveying information over air.
  • the terminal device may be configured to transmit and/or receive information without direct human interaction. For example, the terminal device may transmit information to the network device on predetermined schedules, when triggered by an internal or external event, or in response to requests from the network side.
  • terminal device examples include, but are not limited to, user equipment (UE) such as smart phones, wireless-enabled tablet computers, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , and/or wireless customer-premises equipment (CPE) .
  • UE user equipment
  • LME laptop-embedded equipment
  • CPE wireless customer-premises equipment
  • circuitry may refer to one or more or all of the following:
  • combinations of hardware circuits and software such as (as applicable) : (i) a combination of analog and/or digital hardware circuit (s) with software/firmware and (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • the UE may use one or more of the CE levels corresponding to the two CE modes during the RA procedure.
  • an enhanced machine-type communication (eMTC) UE may attempt RA in several CE levels during a Radio Access Channel (RACH) procedure. If the UE is configured with the CE mode A, the UE may initiate the RACH procedure, for example, in the CE mode A after the maximum scheduling request number (SR-MAX) is reached.
  • SR-MAX maximum scheduling request number
  • the UE fails RA in the CE mode A, the UE may select the CE level 2 or 3 corresponding to the CE mode B, to send a further RA preamble.
  • the UE may use common configurations for the selected CE level, such as a common search space (CSS) for a machine-type communication physical downlink control channel (MPDCCH) search space.
  • SCS common search space
  • MPDCCH machine-type communication physical downlink control channel
  • Msg3 message 3
  • USS user-specific search space
  • FIG. 1 illustrates an example interactive process 100 between the UE and the eNB in a conventional RA procedure.
  • the UE is configured with the CE mode A.
  • the UE selects the CE level 2 or 3 corresponding to the CE mode B.
  • the UE sends (105) message 1 (Msgl) containing a RA preamble to the eNB, and then the eNB sends (110) message 2 (Msg2) as a random access response (RAR) .
  • RAR random access response
  • the UE Upon the reception of Msg2, the UE sends (115) message 3 (Msg3) with Cell Radio Network Temporary Identifier (C-RNTI) .
  • C-RNTI Cell Radio Network Temporary Identifier
  • the transmission of Msg3 is failed.
  • the UE performs the retransmission of Msg3 (120) .
  • the eNB sends (120a) an uplink (UL) grant scrambled by a temporary C-RNTI.
  • the UE may use the CSS for the CE mode B to detect the UL grant.
  • the UE sends (120b) Msg3 to the eNB.
  • the eNB Upon the success of the Msg3 transmission or retransmission, the eNB sends (125) an UL grant scrambled by the C-RNTI in the MPDCCH.
  • the UE falls back to the CE mode A and use the dedicated configurations for the CE mode A to detect the UL grant.
  • the UE initiates (130) transmission on Physical Uplink Shared Channel (PUSCH) based on the UL grant.
  • PUSCH Physical Uplink Shared Channel
  • CE modes typically have different configurations, such as the maximum repetition number (R-max) for MPDCCH/PUCCH/PUSCH/Physical Downlink Shared Channel (PDSCH) .
  • R-max the maximum repetition number
  • PDSCH Physical Downlink Shared Channel
  • the CE mode-A specific configurations sometimes are not robust for transmissions in the CE mode B. For example, in the RA procedure as shown in FIG. 1, using the dedicated configurations for the CE mode A, the MPDCCH transmission (125) and the PUSCH transmission (130) may not be successful in the bad coverage of the eNB.
  • the UE may have to retransmit Radio Link Control (RLC) Protocol Data Units (PDUs) .
  • RLC Radio Link Control
  • PDUs Protocol Data Units
  • radio link failure will be declared. This may result in resource wastes, data interruptions, more power consumptions, and the like.
  • the transmission of the RRC reconfiguration message may also be failed even when the eNB is intended to reconfigure the CE mode B to the UE.
  • Embodiments of the present disclosure provide an improved RA procedure of a terminal device.
  • the terminal device configured with a CE mode initiates a RA procedure in a further CE mode.
  • the terminal device determines whether the dedicated backup configuration is enabled. If it is determined that the dedicated backup configuration is enabled, the terminal device detects a message from a network device by using the dedicated backup configuration.
  • the dedicated backup configuration can be used by the terminal device during the RA procedure if needed.
  • the terminal device may switch to the configuration more adaptable to the radio conditions in time with no need of waiting for CE mode reconfiguration from the network side, so that the RA procedure is more effective and efficient.
  • the network resources and the UE power are saved by disabling inappropriate CE mode configurations.
  • FIG. 2 illustrates an example communication network 200 in which embodiments of the present disclosure can be implemented.
  • the network 200 comprises a terminal device 210 and a network device 220. It is to be understood that the numbers of network devices and terminal devices are shown only for the purpose of illustration without suggesting any limitation.
  • the network 200 may include any suitable numbers of network devices and terminal devices.
  • the terminal device 210 may communicate with the network device 220 or with a further terminal device (not shown) via the network device 220.
  • the communication may utilize any suitable technology that already exists or will be developed in the future.
  • the terminal device 210 may be implemented by an eMTC UE which communicates with or via the network device 220 using the MTC and/or eMTC technology.
  • the terminal device 120 is configured with a CE mode and a dedicated backup configuration.
  • the dedicated backup configuration can be used by the terminal device 120 to improve this RA procedure.
  • FIG. 3 which shows a flowchart of an example method 300 in accordance with some embodiments of the present disclosure.
  • the method 300 can be implemented at the terminal device 210 as shown in FIG. 2. For the purpose of discussion, the method 300 will be described with reference to FIG. 2.
  • the terminal device 210 configured with a CE mode (referred to as a first CE mode) initiates a random access procedure in a different CE mode, referred to as a second CE mode.
  • the first and second CE modes may implemented by any suitable CE mode.
  • the terminal device 210 is in a RRC connected state, and the first and second CE modes are the CE mode A and the CE mode B for the RRC connection state.
  • the terminal device 210 may initiate a RA procedure in the first mode. After the RA procedure in the first mode has failed, the terminal device 210 may initiate the RA procedure in the second CE mode. In some other embodiments, the terminal device 210 may directly use the second CE mode to initiate the RA procedure. For example, in the case that the terminal device 220 is configured with the CE mode A (as the first CE mode) , if the terminal device 220 moves to an area in the bad coverage of the network device 220, the terminal device 220 may choose to use the CE mode B (as the second CE mode) to initiate the RA procedure.
  • the terminal device 210 determines whether a dedicated backup configuration is enabled.
  • the dedicated backup configuration may be configured, for example, by the network device 220, before the RA procedure is initiated.
  • the dedicated backup configuration may be configured together with the configurations or parameters related to the first CE mode in RRC signaling or in a separate RRC reconfiguration message.
  • the dedicated backup configuration may be reconfigured.
  • the dedicated backup configuration may include any suitable parameter that is different from the parameters related to the first CE mode.
  • the dedicated backup configuration may be associated with the second CE mode. Accordingly, the parameter (s) in the dedicated backup configuration may be related to the second CE mode.
  • the dedicated backup configuration may include one or more parameters related to the CE mode B, including, for example, the R-max, G factor which may be used together with the R-max to define the USS, a downlink control information (DCI) format indicating formats of the PDCCH, and the like.
  • DCI downlink control information
  • the dedicated backup configuration may be associated with one or more CE levels of the second CE mode.
  • the dedicated backup configuration may include a plurality of sets of parameters. Each set of parameters is associated with one of the CE levels.
  • the second CE mode is the CE mode B.
  • the dedicated backup configuration may include two sets of parameters for the CE level 2 and the CE level 3, respectively. In some other embodiments, there may be no such a division of the parameters in the dedicated backup configuration.
  • the dedicated backup configuration includes only one set of parameters for the second CE mode.
  • the terminal device 210 may be configured with one or more common backup configurations related to the second CE mode. Once the terminal device 210 initiates a RA attempt in the second CE mode, the common backup configurations may be used, which will be discussed in detail in the following paragraphs.
  • the terminal device 210 may determine whether to enable the dedicated backup configuration by considering any suitable factor. In some embodiments, if a few RA attempts (referred to as a first set of RA attempts) has failed in the first CE mode, the terminal device 210 may initiate further RA attempts (referred to as a second set of RA attempts) in the second CE mode. Upon the initiating of the second set of RA attempts, the terminal device 210 may determine that the dedicated backup configuration is enabled.
  • the terminal device 210 may determine that the set of parameters corresponding to the selected CE level are enabled.
  • Other events may also trigger the enabling of the dedicated backup configuration. For example, during handover of the terminal device 210 from the network device 220 to a further network device (not shown) , it may be determined that the dedicated backup configuration is enabled. As another example, if the measured or reported RSRP level is below a threshold, the terminal device 210 may determine the enabling of the dedicated backup configuration.
  • the enabling of the dedicated backup configuration may be also triggered based on UE mobility. For example, if the terminal device 210 moves to an area in the bad coverage of the network device 220, the terminal device 210 may determine that the dedicated backup configurations should be enabled. In addition or alternatively, the terminal device 210 may determine the enabling of the dedicated backup configuration based on cell deployment. For example, in the cell in the bad coverage, the terminal device 210 may determine the enabling of the dedicated backup configuration.
  • an associated timer may be configured for the dedicated backup configuration.
  • the terminal device 210 may obtain the dedicated backup configuration and the associated timer together from the network device 220. In this case, the terminal device 210 may determine whether to enable the dedicated backup configuration based on the timer. If the timer is expired, the terminal device 210 may determine that the dedicated backup configuration is disabled. In this way, the real-time of the configuration may be further ensured, and therefore the success probability of the RA procedure may be further improved.
  • the terminal device 210 detects a message from the network device 220 using the dedicated backup configuration.
  • the message may include any suitable message during the RA procedure.
  • the message may include an uplink grant from the network device 220.
  • the dedicated backup configuration may be used for detecting the message after Msg3 is successfully transmitted. For example, after the transmission or retransmission of Msg3 in the second CE mode is successful, the terminal device 210 may start to use/activate the dedicated backup configuration. The terminal device 210 may then use the dedicated backup configuration to detect the UL grant from the network device 220. During the Msg3 retransmission, the terminal device 210 may still monitor the CSS for the MPDCCH scrambled with temporary C-RNTI, which is specified by the second CE mode and broadcasted by the network device 220, for example. In these embodiments, the terminal device 210 may use the common configurations specified by the second CE mode before the Msg3 transmission or retransmission is successful.
  • the dedicated backup configuration may be triggered upon the initiation of the second set of RA attempts.
  • the terminal device 210 may anonymously or implicitly switch to the second CE mode.
  • the terminal device 210 may use the common configurations for the second CE mode before the successful Msg3 transmission or retransmission and use the dedicated backup configuration for further communication.
  • the terminal device 210 may use the common backup configurations upon the initiating of the second RA attempt.
  • the terminal device 210 may disable the dedicated backup configuration based on an indication of disabling the dedicated backup configuration.
  • the indication may include an indication from the network device 220, such as an indication for CE mode configuration or reconfiguration.
  • the terminal device 210 may disable the dedicated backup configuration and starts to use the configured CE mode-B related parameters.
  • the network device 220 reconfigures some CE mode-A parameters to the terminal device 210, the terminal device 210 may also disable the dedicated backup configuration.
  • the indication of disabling the dedicated backup configuration may be an indication that the associated timer is expired.
  • the terminal device 210 may disable the dedicated backup configuration upon the expiration of the timer.
  • the terminal device 210 may continue use of the dedicated backup configuration in response to an indication of the CE mode configuration or reconfiguration. For example, in the embodiments where the dedicated backup configuration is associated with the second CE mode, if the network device 220 indicates the terminal device 210 to switch to the second CE mode, the terminal device 210 may continue the use of the dedicated backup configuration while using the common configurations for the second CE mode.
  • the terminal device 210 may automatically trigger radio link failure and re-establishment.
  • the first CE mode configurations may be flushed before the terminal device 210 accesses to the re-established cell.
  • an apparatus capable of performing the method 300 may comprise means for performing the respective steps of the method 300.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises: means for initiating a random access procedure in a second coverage enhancement (CE) mode different from a first CE mode that is configured; means for during the random access procedure, determining whether a dedicated backup configuration is enabled; and means for in response to determining that the dedicated backup configuration is enabled, detecting a message from a network device using the dedicated backup configuration.
  • CE coverage enhancement
  • the means for initiating comprises: means for in response to a first set of random access attempts in the first CE mode having failed, initiating a second set of random access attempts in the second CE mode.
  • the dedicated backup configuration is associated with the second CE mode.
  • the means for determining comprises: means for in response to the initiating of the second set of random access attempts, determining that the dedicated backup configuration is enabled.
  • the second CE mode is associated with a CE level
  • the dedicated backup configuration comprises a set of parameters for the CE level.
  • the means for initiating the second set of random access attempts comprises means for initiating the second set of random access attempts in the CE level.
  • the means for determining comprises means for in response to the initiating of the second set of random access attempts in the CE level, determining that the set of parameters are enabled.
  • the apparatus further comprises: means for in response to receiving an indication of switching the first CE mode to the second CE mode, continuing use of the dedicated backup configuration for further communication with the network device.
  • the dedicated backup configuration is associated with a timer.
  • the means for determining comprises: means for in response to expiration of the timer, determining that the dedicated backup configuration is disabled.
  • the message comprises an uplink grant from the network device.
  • the means for detecting comprises: means for in response to successful transmission of message 3, detecting the uplink grant from the network device by using the dedicated backup configuration.
  • the apparatus further comprises: means for receiving the dedicated backup configuration from the network device in Radio Resource Control (RRC) signaling prior to the initiating of the random access procedure.
  • RRC Radio Resource Control
  • the apparatus further comprises: means for disabling the dedicated backup configuration in response to an indication of disabling the dedicated backup configuration.
  • FIG. 4 is a simplified block diagram of a device 400 that is suitable for implementing embodiments of the present disclosure.
  • the device 400 can be implemented at or as at least a part of the terminal device 210 as shown in FIG. 2.
  • the device 400 includes a processor 410, a memory 420 coupled to the processor 410, a communication module 440 coupled to the processor 410, and a communication interface (not shown) coupled to the communication module 440.
  • the memory 410 stores at least a program 430.
  • the communication module 440 is for bidirectional communications.
  • the communication interface may represent any interface that is necessary for communication with a network element, such as Uu interface for communication between the eNB and the UE.
  • the program 430 is assumed to include program instructions that, when executed by the associated processor 410, enable the device 400 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGS. 2-3.
  • the embodiments herein may be implemented by computer software executable by the processor 410 of the device 400, or by hardware, or by a combination of software and hardware.
  • the processor 410 may be configured to implement various embodiments of the present disclosure.
  • the memory 410 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 410 is shown in the device 400, there may be several physically distinct memory modules in the device 400.
  • the processor 410 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 400 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the method 300 as described above with reference to FIGS. 2-3.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable media.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

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Abstract

Les modes de réalisations de la présente invention concernent un procédé, un dispositif et un support d'informations lisible par ordinateur destiné à une configuration de sauvegarde dans une procédure d'accès aléatoire (RA). Dans des modes de réalisation donnés à titre d'exemple, un dispositif terminal est configuré avec un premier mode d'amélioration de couverture (CE). Le dispositif terminal lance une procédure RA dans un second mode CE différent du premier mode CE. Pendant la procédure d'accès aléatoire, le dispositif terminal détermine si une configuration de sauvegarde dédiée est activée. S'il est déterminé que la configuration de sauvegarde dédiée est activée, le dispositif terminal détecte un message provenant d'un dispositif de réseau en utilisant la configuration de sauvegarde dédiée de telle sorte que la procédure RA est plus efficace et efficiente.
PCT/CN2018/082070 2018-04-05 2018-04-05 Configuration de sauvegarde dans une procédure d'accès aléatoire WO2019192011A1 (fr)

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PCT/CN2018/082070 WO2019192011A1 (fr) 2018-04-05 2018-04-05 Configuration de sauvegarde dans une procédure d'accès aléatoire
CN201880092232.0A CN111937478B (zh) 2018-04-05 2018-04-05 随机接入过程中的后备配置

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US20170290063A1 (en) * 2016-04-01 2017-10-05 Htc Corporation Device and Method of Handling Random Access Procedure

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