WO2023168603A1 - Procédé, dispositif et support de stockage informatique de communication - Google Patents

Procédé, dispositif et support de stockage informatique de communication Download PDF

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Publication number
WO2023168603A1
WO2023168603A1 PCT/CN2022/079776 CN2022079776W WO2023168603A1 WO 2023168603 A1 WO2023168603 A1 WO 2023168603A1 CN 2022079776 W CN2022079776 W CN 2022079776W WO 2023168603 A1 WO2023168603 A1 WO 2023168603A1
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Prior art keywords
partition
random access
terminal device
selection
allowed
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PCT/CN2022/079776
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English (en)
Inventor
Gang Wang
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Nec Corporation
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Priority to PCT/CN2022/079776 priority Critical patent/WO2023168603A1/fr
Publication of WO2023168603A1 publication Critical patent/WO2023168603A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods, devices and computer storage media of communication for random access (RA) .
  • RA random access
  • RACH random access channel partitioning
  • a RA resource partition is defined as a subset of RACH occasions (ROs) and preambles in a RACH configuration and is associated with a specific set of RACH features.
  • UE user equipment
  • embodiments of the present disclosure provide methods, devices and computer storage media of communication for RA.
  • a method of communication comprises: receiving, at a terminal device, a configuration used for switching among random access resource partitions; and in accordance with a determination that the number of unsuccessful random access attempts for a random access procedure based on a first partition in the random access resource partitions is greater than or equal to a threshold number, determining, based on the configuration, whether switching from the first partition to a second partition in the random access resource partitions is allowed; and in accordance with a determination that the switching from the first partition to the second partition is allowed, performing the random access procedure based on the second partition.
  • a method of communication comprises: receiving, at a terminal device, a configuration of a random access procedure, the configuration indicating that the random access procedure is to be started from one of coverage enhancement eligibility check, a random access type selection or a random access resource partition selection; and in accordance with a determination that the number of unsuccessful random access attempts for the random access procedure is greater than or equal to a threshold number, performing the random access procedure based on the configuration.
  • a method of communication comprises: transmitting, at a network device, a configuration used for switching among random access resource partitions; and performing a random access procedure based on the configuration.
  • a method of communication comprises: transmitting, at a network device, a configuration of a random access procedure, the configuration indicating that the random access procedure is to be started from one of coverage enhancement eligibility check, a random access type selection or a random access resource partition selection; and performing the random access procedure based on the configuration.
  • a terminal device comprising a processor configured to perform the method according to any of the first and second aspects of the present disclosure.
  • a network device comprising a processor configured to perform the method according to any of the third and fourth aspects of the present disclosure.
  • a computer readable medium having instructions stored thereon.
  • the instructions when executed on at least one processor, cause the at least one processor to perform the method according to any of the first and second aspects of the present disclosure.
  • a computer readable medium having instructions stored thereon.
  • the instructions when executed on at least one processor, cause the at least one processor to perform the method according to any of the first and second aspects of the present disclosure.
  • FIG. 1 illustrates an example communication network in which some embodiments of the present disclosure can be implemented
  • FIG. 2 illustrates a schematic diagram illustrating a process of communication according to some embodiments of the present disclosure
  • FIG. 3A illustrates a schematic diagram illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure
  • FIG. 3B illustrates a schematic diagram illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure
  • FIG. 3C illustrates a schematic diagram illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure
  • FIG. 3D illustrates a schematic diagram illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure
  • FIG. 3E illustrates a schematic diagram illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure
  • FIG. 3F illustrates a schematic diagram illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure
  • FIG. 4A illustrates a schematic diagram illustrating a problem in a selection of a RA resource partition according to some embodiments of the present disclosure
  • FIG. 4B illustrates a schematic diagram illustrating another problem in a selection of a RA resource partition according to some embodiments of the present disclosure
  • FIG. 5 illustrates a schematic diagram illustrating another process of communication according to some embodiments of the present disclosure
  • FIG. 6A illustrates a schematic diagram illustrating an example fallback of a RA procedure according to some embodiments of the present disclosure
  • FIG. 6B illustrates a schematic diagram illustrating an example fallback of a RA procedure according to some embodiments of the present disclosure
  • FIG. 6C illustrates a schematic diagram illustrating an example fallback of a RA procedure according to some embodiments of the present disclosure
  • FIG. 6D illustrates a schematic diagram illustrating an example fallback of a RA procedure according to some embodiments of the present disclosure
  • FIG. 7 illustrates an example method of communication implemented at a terminal device in accordance with some embodiments of the present disclosure
  • FIG. 8 illustrates another example method of communication implemented at a terminal device in accordance with some embodiments of the present disclosure
  • FIG. 9 illustrates an example method of communication implemented at a network device in accordance with some embodiments of the present disclosure
  • FIG. 10 illustrates another example method of communication implemented at a network device in accordance with some embodiments of the present disclosure.
  • FIG. 11 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • terminal device refers to any device having wireless or wired communication capabilities.
  • the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Ultra-reliable and Low Latency Communications (URLLC) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, devices for Integrated Access and Backhaul (IAB) , Small Data Transmission (SDT) , mobility, Multicast and Broadcast Services (MBS) , positioning, dynamic/flexible duplex in commercial networks, reduced capability (RedCap) , Space borne vehicles or Air borne vehicles in Non-terrestrial networks (NTN) including Satellites and High Altitude Platforms (HAPs) encompassing Unmanned Aircraft Systems (UAS) , eX
  • UE user equipment
  • the ‘terminal device’ can further has ‘multicast/broadcast’ feature, to support public safety and mission critical, V2X applications, transparent IPv4/IPv6 multicast delivery, IPTV, smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also incorporated one or multiple Subscriber Identity Module (SIM) as known as Multi-SIM.
  • SIM Subscriber Identity Module
  • the term “terminal device” can be used interchangeably with a UE, a mobile station, a subscriber station, a mobile terminal, a user terminal or a wireless device.
  • network device refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a transmission reception point (TRP) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS) , Network-controlled Repeaters, and the like.
  • NodeB Node B
  • eNodeB or eNB evolved NodeB
  • gNB next generation NodeB
  • TRP transmission reception point
  • RRU remote radio unit
  • RH radio head
  • RRH remote radio head
  • IAB node a low power node such
  • the terminal device or the network device may have Artificial intelligence (AI) or Machine learning capability. It generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
  • AI Artificial intelligence
  • Machine learning capability it generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
  • the terminal or the network device may work on several frequency ranges, e.g. FR1 (410 MHz to 7125 MHz) , FR2 (24.25GHz to 71GHz) , frequency band larger than 100GHz as well as Tera Hertz (THz) . It can further work on licensed/unlicensed/shared spectrum.
  • the terminal device may have more than one connections with the network devices under Multi-Radio Dual Connectivity (MR-DC) application scenario.
  • MR-DC Multi-Radio Dual Connectivity
  • the terminal device or the network device can work on full duplex, flexible duplex and cross division duplex modes.
  • the network device may have the function of network energy saving, Self-Organising Networks (SON) /Minimization of Drive Tests (MDT) .
  • the terminal may have the function of power saving.
  • test equipment e.g. signal generator, signal analyzer, spectrum analyzer, network analyzer, test terminal device, test network device, channel emulator.
  • the embodiments of the present disclosure may be performed according to any generation communication protocols either currently known or to be developed in the future.
  • Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, 5.5G, 5G-Advanced networks, or the sixth generation (6G) networks.
  • the terminal device may be connected with a first network device and a second network device.
  • One of the first network device and the second network device may be a master node and the other one may be a secondary node.
  • the first network device and the second network device may use different radio access technologies (RATs) .
  • the first network device may be a first RAT device and the second network device may be a second RAT device.
  • the first RAT device is eNB and the second RAT device is gNB.
  • Information related with different RATs may be transmitted to the terminal device from at least one of the first network device or the second network device.
  • first information may be transmitted to the terminal device from the first network device and second information may be transmitted to the terminal device from the second network device directly or via the first network device.
  • information related with configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device.
  • Information related with reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
  • the singular forms ‘a’ , ‘an’ and ‘the’ are intended to include the plural forms as well, unless the context clearly indicates otherwise.
  • the term ‘includes’ and its variants are to be read as open terms that mean ‘includes, but is not limited to. ’
  • the term ‘based on’ is to be read as ‘at least in part based on. ’
  • the term ‘one embodiment’ and ‘an embodiment’ are to be read as ‘at least one embodiment. ’
  • the term ‘another embodiment’ is to be read as ‘at least one other embodiment. ’
  • the terms ‘first, ’ ‘second, ’ and the like may refer to different or same objects. Other definitions, explicit and implicit, may be included below.
  • values, procedures, or apparatus are referred to as ‘best, ’ ‘lowest, ’ ‘highest, ’ ‘minimum, ’ ‘maximum, ’ or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • fallback can be used interchangeably with “switch”
  • RA resource partition can be used interchangeably with “partition”
  • RACH feature can be used interchangeably with “feature”
  • candidate partition can be used interchangeably with “fallback partition”
  • the term “areduced capability UE” can be used interchangeably with “aterminal device with reduced capability” .
  • Embodiments of the present disclosure provide solutions of a fallback of a RA procedure under RACH partitioning.
  • a terminal device receives a configuration used for switching among RA resource partitions.
  • the terminal device selects a first partition of the RA resource partitions for use in the RA procedure. If the number of unsuccessful RA attempts for the RA procedure based on the first partition is greater than or equal to a threshold number, the terminal device determines, based on the configuration, whether the switching from the first partition to a second partition in the RA resource partitions is allowed. If the switching from the first partition to the second partition is allowed, the terminal device performs the RA procedure based on the second partition. In this way, a fallback of a RA procedure among RA resource partitions is achieved. Accordingly, RA performance is improved when channel quality changes during a RA procedure.
  • a terminal device receives a configuration of a RA procedure, the configuration indicating that the RA procedure is to be started from one of coverage enhancement (CE) eligibility check, a RA type selection or a RA resource partition selection. If the number of unsuccessful RA attempts for the RA procedure is greater than or equal to a threshold number, the terminal device performs the random access procedure based on the configuration. In this way, a fallback of a RA procedure is achieved. Accordingly, RA performance is also improved when channel quality changes during a RA procedure.
  • CE coverage enhancement
  • FIG. 1 illustrates an example communication network 100 in which embodiments of the present disclosure can be implemented.
  • the communication network 100 includes a terminal device 110 and a network device 120.
  • the network device 120 may provide a cell serving a terminal device.
  • the communication network 100 may include any suitable number of network devices and/or terminal devices adapted for implementing implementations of the present disclosure.
  • the terminal device 110 may communicate with the network device 120 via a channel such as a wireless communication channel.
  • the communications in the communication network 100 may conform to any suitable standards including, but not limited to, Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) and Global System for Mobile Communications (GSM) and the like.
  • LTE Long Term Evolution
  • LTE-A LTE-Evolution
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) , 5.5G, 5G-Advanced networks, or the sixth generation (6G) communication protocols.
  • the wireless communication channel may comprise a physical uplink control channel (PUCCH) , a physical uplink shared channel (PUSCH) , a physical random-access channel (PRACH) , a physical downlink control channel (PDCCH) , a physical downlink shared channel (PDSCH) and a physical broadcast channel (PBCH) .
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • PRACH physical random-access channel
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • PBCH physical broadcast channel
  • the network device 120 may transmit a RACH configuration.
  • the terminal device 110 may receive the RACH configuration and initiate a RA procedure based on the RACH configuration to establish a connection with the network device 120. If the number of unsuccessful RA attempts during a RA procedure exceeds a threshold number, the terminal device 110 may perform a fallback of a RA procedure.
  • RACH resources may be partitioned into multiple RA resource partitions and each of the multiple RA resource partitions may be associated with a specific set of RACH features.
  • a RACH feature (for convenience, also referred to as a feature herein) may comprise at least one of CE, non-CE, reduced capability, SDT, non-SDT, slice specific, non-slice specific, PRACH repetitions using the same beam, PRACH repetitions using different beams, message 3 (i.e., Msg3) repetition, or non-message 3 repetition. It is to be understood that the RACH feature may also comprise any other suitable features, and the present disclosure does not limit this aspect.
  • Embodiments of the present disclosure provide improved solutions of a fallback of a RA procedure under RACH partitioning. These solutions will be described in detail with reference to FIGs. 2 to 6D below.
  • FIG. 2 illustrates a schematic diagram illustrating a process 200 of communication according to some embodiments of the present disclosure. For the purpose of discussion, the process 200 will be described with reference to FIG. 1. The process 200 may involve the terminal device 110 and the network device 120 as illustrated in FIG. 1.
  • the network device 120 transmits 210 a configuration used for switching among RA resource partitions.
  • the network device 120 may transmit the configuration via a broadcast signaling.
  • the network device 120 may transmit the configuration via a system information block 1 (SIB1) , e.g., in RACH-config field or any other suitable fields in the SIB1.
  • SIB1 system information block 1
  • the network device 120 may transmit the configuration via a dedicated signaling.
  • the network device 120 may transmit the configuration via RRC signaling, e.g., RRCRelease message or RRCReconfiguration message or any other suitable messages.
  • the configuration may comprise a set of configurations configured per partition.
  • the configuration may comprise a set of configurations configured per feature.
  • the configuration may comprise an indication (for convenience, also referred to as a first indication herein) indicating whether a partition in the RA resource partitions is allowed to be switched.
  • the configuration may comprise a set of first indications to indicate whether each of the RA resource partitions is allowed to be switched.
  • the first indication may adopt any suitable forms. In this way, a fallback allowed indication is indicated in an explicit way.
  • the configuration may comprise an indication (for convenience, also referred to as a second indication herein) indicating a candidate partition associated with a partition in the RA resource partitions. For example, if the partition is allowed to be switched, the network device 120 may indicate the candidate partition associated with the partition. In some embodiments where a set of partitions are allowed to be switched, the configuration may comprise a set of second indications to indicate a candidate partition associated with each partition in the set of partitions. In this way, a fallback allowed indication is indicated in an implicit way.
  • an indication for convenience, also referred to as a second indication herein
  • the configuration may comprise an indication (for convenience, also referred to as a third indication herein) indicating whether a feature applicable to at least one of the RA resource partitions is allowed to be changed.
  • the configuration may comprise a set of third indications to indicate whether each of features configured in at least one of the RA resource partitions is allowed to be changed.
  • enabling of one feature may be considered as fallback-allowed, e.g., Slice.
  • disabling of one feature may be considered as fallback-allowed, e.g., non-CE.
  • a fallback direction may be explicitly indicated, e.g., from non-CE to CE.
  • first, second and third indications as described above may be separately used or may be used in any suitable combination.
  • the present disclosure does not limit this aspect.
  • the configuration may further comprise priorities configured for the RA resource partitions. In some embodiments, the configuration may further comprise priorities configured for features applicable to the RA resource partitions.
  • the configuration may be specific to a type of RA.
  • the configuration may be specific to 2-step RA, 4-step RA, contention based random access (CBRA) or contention free random access (CFRA) .
  • CBRA contention based random access
  • CFRA contention free random access
  • a fallback allowed indication for a partition is indicated for 2-step RA
  • fallback among partitions is allowed only when 2-step RA is selected.
  • 4-step RA will be used when fallback to the candidate partition.
  • the configuration may also comprise any other suitable information.
  • the configuration may be comprised in a RACH configuration as below.
  • FallbackRach-ConfigIndex corresponds to the configuration used for switching among RA resource partitions. FallbackRach-ConfigIndex is associated with a RACH configuration or RA resource partitions. If FallbackRach-ConfigIndex does not exist in the RACH configuration, fallback among partitions is not allowed.
  • the terminal device 110 receives the configuration.
  • the terminal device 110 initiates the RA procedure based on the configuration.
  • the terminal device 110 may initially select 220 one (for convenience, also referred to as a first partition herein) of the RA resource partitions.
  • the terminal device 110 may determine a set of partitions available for the RA procedure and select a partition from the set of partitions as the first partition.
  • the terminal device 110 may consider the partition as unavailable for a RA procedure which is not triggered by a terminal device with reduced capability (e.g., RedCap UE) .
  • a terminal device with reduced capability e.g., RedCap UE
  • the terminal device 110 may consider the partition as unavailable for a RA procedure which is not triggered for SDT.
  • a feature of slice is configured for a partition
  • the terminal device 110 may consider the partition as unavailable for a RA procedure which is not triggered for the corresponding slice.
  • the terminal device 110 may consider the partition as unavailable for a RA procedure which does not require Msg3 repetition. In this way, a set of partitions available for the RA procedure may be determined.
  • the terminal device 110 may select the partition as the first partition. If no partition in the set of partitions indicating all the applicable features for the RA procedure, the terminal device 110 may select a partition from the set of partitions based on a priority order indicated in system information. In this way, the first partition may be selected. It is to be understood that these are merely examples, and the selection of the first partition may be carried out in any other suitable ways.
  • the terminal device 110 Based on the selected first partition, the terminal device 110 performs the RA procedure. During the RA procedure, the terminal device 110 determines 230 whether the number of unsuccessful RA attempts for the RA procedure based on the first partition is greater than or equal to a threshold number.
  • the terminal device 110 determines, based on the configuration, whether switching from the first partition to another partition (for convenience, also referred to as a second partition herein) in the RA resource partitions is allowed. In some embodiments, the terminal device 110 may determine 240 whether the first partition is allowed to be switched. If the first partition is allowed to be switched, the terminal device 110 may determine 250 the second partition available for the RA procedure from the RA resource partitions.
  • the terminal device 110 may determine that the first partition is allowed to be switched.
  • the terminal device 110 may determine that the first partition is allowed to be switched.
  • the terminal device 110 may determine that the first partition is allowed to be switched. For example, Slice is indicated as fallback-allowed and configured in the first partition. In this case, a fallback from a slice specific RACH to a common RACH is allowed.
  • the terminal device 110 may determine that the first partition is allowed to be switched. For example, non-CE is indicated as fallback-allowed and CE is not configured in the first partition. In this case, a fallback from non-CE to CE is allowed.
  • the terminal device 110 may determine that the first partition is allowed to be switched. For example, a fallback from non-CE to CE is indicated as allowed. If CE is not configured in the first partition, i.e., non-CE is applied in the first partition, the first partition is considered as fallback-allowed.
  • the terminal device 110 may determine the second partition from the RA resource partitions. In some embodiments, the terminal device 110 may determine the second partition based on the same selection rules as that for the selection of the first partition.
  • the terminal device 110 may determine the candidate partition as the second partition. For illustration, some examples for determination of the second partition will be described in connection with FIGs. 3A to 3B. In these examples, the configuration is configured per partition.
  • FIG. 3A illustrates a schematic diagram 300A illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure.
  • a partition 301 is configured with RedCap feature and a fallback partition associated with the partition 301 is indicated as a partition 302.
  • the partition 302 is configured with CE and RedCap features and a fallback from the partition 302 is unallowed.
  • a partition 303 is configured with Slice feature and a fallback from the partition 303 is unallowed.
  • a partition 304 is configured with RedCap and Slice features and a fallback partition associated with the partition 304 is indicated as the partition 301.
  • RedCap UE initiates a RA procedure. Assuming that the partition 304 is initially selected as the first partition. As shown in FIG. 3A, the partition 304 is indicated as fallback-allowed and a fallback partition associated with the partition 304 is indicated as the partition 301. When the number of unsuccessful RA attempts is greater than or equal to a threshold number, the partition 301 is determined as the second partition to be switched.
  • FIG. 3B illustrates a schematic diagram 300B illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure.
  • a partition 305 is configured with RedCap and SDT features
  • a partition 306 is configured with SDT and Slice features
  • a partition 307 is configured with RedCap and Slice features.
  • RedCap UE not required Msg1 identification selects the partition 306 in initial partition selection.
  • the RedCap UE may re-select a partition configured with SDT or fallback to use legacy resources if the partition configured with SDT not exists. But if a fallback partition is indicated as the partition 305, the partition 305 will be also available. This will provide more flexible configuration.
  • the terminal device 110 may obtain a candidate partition by changing a set of features comprised in the first partition, the set of features being allowed to be changed. If the candidate partition is comprised in the RA resource partitions, the terminal device 110 may determine the candidate partition as the second partition. If the candidate partition is not comprised in the RA resource partitions, the terminal device 110 may determine the second partition from the RA resource partitions by changing a feature in the set of features based on priorities configured for the set of features.
  • the terminal device 110 may determine the second partition from the RA resource partitions so that a feature having a higher priority can be ensured. Assuming that a priority of feature A is higher than a priority of feature B, and the priority of feature B is higher than a priority of feature C. Further, assuming that the candidate partition is determined as A+B+C. If a configured partition indicates A+B+C, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates A+B. If a configured partition indicates A+B, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates A+C. If a configured partition indicates A+C, the configured partition is determined as the second partition.
  • the terminal device 110 may determine whether a configured partition indicates A. If a configured partition indicates A, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates B+C. If a configured partition indicates B+C, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates B. If a configured partition indicates B, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates C. If a configured partition indicates C, the configured partition is determined as the second partition. Otherwise, a fallback is not performed or a fallback is performed to legacy resources.
  • the terminal device 110 may determine the second partition from the RA resource partitions so that more features can be ensured. Assuming that a priority of feature A is higher than a priority of feature B, and the priority of feature B is higher than a priority of feature C. Further, assuming that the candidate partition is determined as A+B+C. If a configured partition indicates A+B+C, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates A+B. If a configured partition indicates A+B, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates A+C. If a configured partition indicates A+C, the configured partition is determined as the second partition.
  • the terminal device 110 may determine whether a configured partition indicates B+C. If a configured partition indicates B+C, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates A. If a configured partition indicates A, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates B. If a configured partition indicates B, the configured partition is determined as the second partition. Otherwise, the terminal device 110 may determine whether a configured partition indicates C. If a configured partition indicates C, the configured partition is determined as the second partition. Otherwise, a fallback is not performed or a fallback is performed to legacy resources.
  • the terminal device 110 may obtain a candidate partition by changing a set of features comprised in the first partition, the set of features being allowed to be changed. If the candidate partition is comprised in the RA resource partitions, the terminal device 110 may determine the candidate partition as the second partition. If the candidate partition is not comprised in the RA resource partitions, the terminal device 110 may determine the second partition from the RA resource partitions based on the priorities configured for the RA resource partitions.
  • the terminal device 110 may not perform a fallback or may perform a fallback to legacy resources.
  • the network device 120 should guarantee that for fallback-allowed partitions, available fallback partitions should exist.
  • the configuration is configured per feature.
  • FIG. 3C illustrates a schematic diagram 300C illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure.
  • a partition 310 is configured with RedCap feature.
  • the partition 311 is configured with CE and RedCap features.
  • a partition 312 is configured with Slice feature.
  • a partition 313 is configured with RedCap and Slice features.
  • RedCap UE initiates a RA procedure. Assuming that a fallback from non-CE to CE is indicated as allowed and the partition 310 is initially selected as the first partition. When the number of unsuccessful RA attempts is greater than or equal to a threshold number, a fallback partition is determined as configured with CE and RedCap features, and thus the partition 311 is determined as the second partition to be switched.
  • FIG. 3D illustrates a schematic diagram 300D illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure.
  • a partition 320 is configured with RedCap feature.
  • the partition 321 is configured with CE and RedCap features.
  • a partition 322 is configured with Slice feature.
  • a partition 323 is configured with RedCap and Slice features.
  • RedCap UE initiates a RA procedure. Assuming that slice specific to non-slice specific is indicated as allowed and the partition 323 is initially selected as the first partition. When the number of unsuccessful RA attempts is greater than or equal to a threshold number, a fallback partition is determined as configured with RedCap feature, and thus the partition 320 is determined as the second partition to be switched.
  • FIG. 3E illustrates a schematic diagram 300E illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure.
  • a partition 330 is configured with RedCap feature.
  • the partition 331 is configured with CE and RedCap features.
  • a partition 332 is configured with Slice feature.
  • a partition 333 is configured with RedCap and Slice features.
  • RedCap UE initiates a RA procedure. Assuming that a fallback from non-CE to CE and slice specific to non-slice specific are indicated as allowed. Assuming that the partition 333 is initially selected as the first partition. When the number of unsuccessful RA attempts is greater than or equal to a threshold number, a fallback partition is determined as configured with RedCap and CE features, and thus the partition 331 is determined as the second partition to be switched.
  • FIG. 3F illustrates a schematic diagram 300F illustrating an example fallback from a RA resource partition according to some embodiments of the present disclosure.
  • a partition 340 is configured with RedCap feature.
  • the partition 341 is configured with CE, RedCap and Slice features.
  • a partition 342 is configured with Slice feature.
  • a partition 343 is configured with RedCap and Slice features.
  • RedCap UE initiates a RA procedure. Assuming that a fallback from non-CE to CE and slice specific to non-slice specific are indicated as allowed. Assuming that a priority of CE feature is higher than that of Slice feature or that a priority of the partition 341 is higher than that of the partition 340. In this example, the partition 343 is initially selected as the first partition. When the number of unsuccessful RA attempts is greater than or equal to a threshold number, a fallback partition is determined as configured with RedCap and CE features. However, only the partition 340 configured with RedCap feature and the partition 341 configured with CE, RedCap and Slice features are available. As CE has a higher priority, thus the partition 341 is determined as the second partition to be switched.
  • FIGs. 3A to 3F are merely for illustration, and not intended for limitation.
  • the terminal device 110 upon determination of the second partition, performs 260 the RA procedure based on the second partition. In this way, a fallback of the RA procedure among different RA resource partitions is achieved. An improved RACH performance may be obtained when channel quality changes during RACH procedure.
  • RedCap UE uses message 1 (Msg1) early identification whenever transmitting preamble for CBRA, as long as the Msg1 early identification is configured for the RedCap UE by a network device.
  • Msg1 early identification is enabled implicitly by the presence of dedicate RACH configuration for Msg1 early identification.
  • RedCap feature is configured for a partition, then the partition is only applicable to a RA procedure triggered for RedCap UE where Msg1 identification is required. Otherwise, if RedCap feature is not configured, then the partition is applicable to non-RedCap UE and RedCap UE where Msg1 identification is not required.
  • RedCap UE if other features have a higher priority than that of RedCap feature, a partition configured with RedCap may be not selected. In this case, for RedCap UE for which Msg1 identification is required, the RedCap UE cannot apply Msg1 early identification.
  • FIG. 4A illustrates a schematic diagram 400A illustrating a problem in a selection of a RA resource partition according to some embodiments of the present disclosure.
  • MAC entity of RedCap UE 401 may be configured with SDT, RedCap and Slice indications.
  • a partition 402 is configured with SDT and Slice features, and a partition 403 is configured with RedCap and Slice features. That is, no partition is configured with SDT, RedCap and Slice features. If SDT feature has a higher priority than that of RedCap feature, the partition 402 will be selected for a RA procedure. In this case, the RedCap UE 401 cannot apply Msg1 early identification.
  • embodiments of the present disclosure provide a solution of selecting a partition.
  • a terminal device is a RedCap terminal device and an identification of the terminal device is required in a preamble transmission
  • the terminal device determines a partition by considering that RedCap feature has the highest priority. In other words, if priority is configured per feature, RedCap feature is always considered as having the highest priority.
  • a terminal device if a terminal device is a RedCap terminal device and an identification of the terminal device is required in a preamble transmission, the terminal device determines a partition by considering that a priority of a partition indicating RedCap feature is higher than a priority of a partition indicating non-RedCap feature. In other words, if priority is configured per partition, a priority of a partition comprising RedCap feature is always consider as being higher than a priority of a partition comprising non-RedCap feature.
  • Msg1 identification may be ensured to be performed when Msg1 identification is required.
  • RedCap UE for which Msg1 identification is not required, if there is no partition configuring all applicable features, a terminal device does not consider a partition configured with RedCap feature upon partition selection. That is, one partition will also be considered as available if the partition indicating all the applicable features besides RedCap feature.
  • FIG. 4B illustrates a schematic diagram 400B illustrating another problem in a selection of a RA resource partition according to some embodiments of the present disclosure.
  • MAC entity of RedCap UE 411 may be configured with Slice and SDT indications.
  • a partition 412 is configured with RedCap, SDT and Slice features, and a partition 413 is configured with Slice feature. That is, no partition is only configured with SDT and Slice features. In this case, the partition 413 will be selected for a RA procedure.
  • Msg1 identification is not required for the RedCap UE 411, and in fact, the partition 412 is more appropriate for the RA procedure.
  • embodiments of the present disclosure provide a solution of selecting a partition.
  • the terminal device determines a partition by allowing to select a partition comprising RedCap feature.
  • Redcap UE is allowed to select a partition configured with RedCap feature even if Msg1 identification is not required by dedicated RACH configuration. In this way, partition selection may be optimized.
  • Embodiments of the present disclosure also provide a solution of a fallback of a RA procedure.
  • the solution will be described with reference to FIG. 5 below.
  • FIG. 5 illustrates a schematic diagram illustrating a process 500 of communication according to some embodiments of the present disclosure.
  • the process 500 will be described with reference to FIG. 1.
  • the process 500 may involve the terminal device 110 and the network device 120 as illustrated in FIG. 1.
  • the network device 120 transmits 510 a configuration of a RA procedure, the configuration indicating that the RA procedure is to be started from one of CE eligibility check, a RA type selection or a RA resource partition selection.
  • the terminal device 110 determines 520 whether the number of unsuccessful RA attempts for the RA procedure is greater than or equal to a threshold number. If the number of unsuccessful RA attempts is greater than or equal to the threshold number, the terminal device 110 performs 530 the RA procedure based on the configuration. That is, the terminal device 110 may re-start the RA procedure from one of CE eligibility check, a RA type selection or a RA resource partition selection. In this way, a fallback of a RA procedure may be achieved.
  • the configuration may comprise a first threshold number configured for the earliest one of the CE eligibility check, the RA type selection or the RA resource partition selection, a second threshold number configured for the second-earliest one of the CE eligibility check, the RA type selection or the RA resource partition selection, and a third threshold number configured for the latest one of the CE eligibility check, the RA type selection or the RA resource partition selection.
  • the number of unsuccessful RA attempts for the RA procedure may be continuously counted for each of the unsuccessful RA attempts.
  • the second threshold number is greater than the third threshold number and is smaller than the first threshold number. In these embodiments, if the number of unsuccessful RA attempts for the RA procedure is greater than or equal to the third threshold number and is smaller than the second threshold number, the terminal device 110 may cause the RA procedure to be started from the latest one of the CE eligibility check, the RA type selection or the RA resource partition selection.
  • the terminal device 110 may cause the RA procedure to be started from the second-earliest one of the CE eligibility check, the RA type selection or the RA resource partition selection. In some embodiments, if the number of unsuccessful RA attempts for the RA procedure is greater than or equal to the first threshold number, the terminal device 110 may cause the RA procedure to be started from the earliest one of the CE eligibility check, the RA type selection or the RA resource partition selection. In this way, a RA procedure may be performed in an efficient way.
  • the number of unsuccessful RA attempts for the RA procedure may be separately counted for each of the unsuccessful RA attempts. In these embodiments, if the number of unsuccessful RA attempts for the RA procedure is greater than or equal to the third threshold number, the terminal device 110 may cause the RA procedure to be started from the latest one of the CE eligibility check, the RA type selection or the RA resource partition selection. In some embodiments, if the number of unsuccessful RA attempts for the RA procedure is greater than or equal to the second threshold number and, the terminal device 110 may cause the RA procedure to be started from the second-earliest one of the CE eligibility check, the RA type selection or the RA resource partition selection.
  • the terminal device 110 may cause the RA procedure to be started from the earliest one of the CE eligibility check, the RA type selection or the RA resource partition selection. In this way, a RA procedure may be performed in an efficient way.
  • the first, second and third threshold numbers may adopt any suitable values.
  • FIG. 6A illustrates a schematic diagram 600A illustrating an example fallback of a RA procedure according to some embodiments of the present disclosure.
  • the RA procedure may comprise carrier selection 601, BWP selection 602, partition selection with CE eligibility check 603, and RA type selection 604 in order.
  • the CE eligibility check will be performed before the partition selection.
  • the CE or partition selection may be indicated in the configuration.
  • the terminal device 110 may re-start the RA procedure or initiate next random access attempt from the partition selection with CE eligibility check 603. In this case, the terminal device 110 may perform the partition selection with CE eligibility check 603 and the RA type selection 604. In some embodiments, before the partition selection, the terminal device 110 may re-evaluate CE eligibility criteria or change from non-CE to CE if configured.
  • the RA type selection may be indicated in the configuration.
  • the terminal device 110 may reset the RA type or switch from 2-step RA to 4-step RA.
  • FIG. 6B illustrates a schematic diagram 600B illustrating an example fallback of a RA procedure according to some embodiments of the present disclosure.
  • the RA procedure may comprise partition selection with CE eligibility check 611, carrier selection 612, BWP selection 613, and RA type selection 614 in order.
  • the CE eligibility check will be performed before the partition selection.
  • the CE or partition selection may be indicated in the configuration.
  • the terminal device 110 may re-start or start the RA procedure from the partition selection with CE eligibility check 611.
  • the terminal device 110 may perform the partition selection with CE eligibility check 611, carrier selection 612, BWP selection 613, and RA type selection 614.
  • the terminal device 110 may re-evaluate CE eligibility criteria or change from non-CE to CE.
  • the terminal device 110 may re-select carrier and BWP.
  • the terminal device 110 may reset the RA type or switch from 2-step RA to 4-Step RA.
  • the RA type selection may be indicated in the configuration.
  • the terminal device 110 may reset the RA type or switch from 2-step RA to 4-step RA.
  • FIG. 6C illustrates a schematic diagram 600C illustrating an example fallback of a RA procedure according to some embodiments of the present disclosure.
  • the RA procedure may comprise partition selection 621, carrier selection 622, BWP selection 623, CE eligibility check 624 and RA type selection 625 in order.
  • the CE eligibility check will be performed after the partition selection.
  • the partition selection may be indicated in the configuration.
  • the terminal device 110 may re-start or start the RA procedure from the partition selection 621.
  • the terminal device 110 may perform the partition selection 621, the carrier selection 622, the BWP selection 623, the CE eligibility check 624 and the RA type selection 625.
  • the terminal device 110 may re-evaluate CE eligibility criteria or change from non-CE to CE.
  • the terminal device 110 may re-select carrier and BWP.
  • the terminal device 110 may reset the RA type or switch from 2-step RA to 4-Step RA.
  • the CE eligibility check may be indicated in the configuration.
  • the terminal device 110 may perform the CE eligibility check 624 and the RA type selection 625.
  • the terminal device 110 may re-evaluate CE eligibility criteria or change from non-CE to CE.
  • the terminal device 110 may reset the RA type or switch from 2-step RA to 4-Step RA.
  • the RA type selection may be indicated in the configuration.
  • the terminal device 110 may reset the RA type or switch from 2-step RA to 4-step RA.
  • FIG. 6D illustrates a schematic diagram 600D illustrating an example fallback of a RA procedure according to some embodiments of the present disclosure.
  • the RA procedure may comprise partition selection 631, carrier selection 632, BWP selection 633, RA type selection 634 and CE eligibility check 635 in order.
  • the CE eligibility check will be performed after the partition selection.
  • the partition selection may be indicated in the configuration.
  • the terminal device 110 may re-start or start the RA procedure from the partition selection 631.
  • the terminal device 110 may perform the partition selection 631, the carrier selection 632, the BWP selection 633, the RA type selection 634 and the CE eligibility check 635.
  • the terminal device 110 may re-evaluate CE eligibility criteria or change from non-CE to CE.
  • the terminal device 110 may re-select carrier and BWP.
  • the terminal device 110 may reset the RA type or switch from 2-step RA to 4-Step RA.
  • the CE eligibility check may be indicated in the configuration.
  • the terminal device 110 may re-evaluate CE eligibility criteria or change from non-CE to CE.
  • the RA type selection may be indicated in the configuration.
  • the terminal device 110 may perform the RA type selection 634 and the CE eligibility check 635.
  • the terminal device 110 may reset the RA type or switch from 2-step RA to 4-step RA.
  • the terminal device 110 may re-evaluation the CE eligibility criteria or fallback by changing Non-CE to CE.
  • the RA procedure may be configured to be re-started from other one or more stages in the RA procedure, and accordingly one or more threshold numbers may also be configured for the one or more stages.
  • embodiments of the present disclosure provide methods of communication implemented at a terminal device and a network device. These methods will be described below with reference to FIGs. 7 to 10.
  • FIG. 7 illustrates an example method 700 of communication implemented at a terminal device in accordance with some embodiments of the present disclosure.
  • the method 700 may be performed at the terminal device 110 as shown in FIG. 1.
  • the method 700 will be described with reference to FIG. 1. It is to be understood that the method 700 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
  • the terminal device 110 receives a configuration used for switching among RA resource partitions.
  • the configuration may comprise at least one of the following: a first indication indicating whether a partition in the RA resource partitions is allowed to be switched, a second indication indicating a candidate partition associated with the partition, or a third indication indicating whether a feature applicable to the RA resource partitions is allowed to be switched.
  • the feature comprises at least one of the following: CE, non-CE, reduced capability, SDT, non-SDT, slice specific, non-slice specific, PRACH repetitions using the same beam, PRACH repetitions using different beams, message 3 repetition, or non-message 3 repetition.
  • any other suitable features are also feasible.
  • the terminal device 110 determines whether the number of unsuccessful RA attempts for a RA procedure based on a first partition in the RA resource partitions is greater than or equal to a threshold number. If the number of unsuccessful RA attempts is greater than or equal to the threshold number, the method 700 proceeds to block 730.
  • the terminal device 110 determines, based on the configuration, whether switching from the first partition to a second partition in the RA resource partitions is allowed. In some embodiments, the terminal device 110 may determine whether the first partition is allowed to be switched. If the first partition is allowed to be switched, the terminal device 110 may determine the second partition from the RA resource partitions.
  • the terminal device 110 may determine that the first partition is allowed to be switched. In some embodiments, if a feature applicable to the RA resource partitions is configured in the first partition and the feature is allowed to be changed, the terminal device 110 may determine that the first partition is allowed to be switched.
  • the method proceeds to block 740.
  • the terminal device 110 performs the RA procedure based on the second partition.
  • the terminal device 110 may determine the candidate partition as the second partition.
  • the terminal device 110 may obtain a candidate partition by changing a set of features comprised in the first partition, the set of features being allowed to be changed. If the candidate partition is comprised in the RA resource partitions, the terminal device 110 may determine the candidate partition as the second partition. If the candidate partition is not comprised in the RA resource partitions, the terminal device 110 may determine the second partition from the RA resource partitions by changing a feature in the set of features based on priorities configured for the set of features.
  • the terminal device 110 may obtain a candidate partition by changing a set of features comprised in the first partition, the set of features being allowed to be changed. If the candidate partition is comprised in the RA resource partitions, the terminal device 110 may determine the candidate partition as the second partition. If the candidate partition is not comprised in the RA resource partitions, the terminal device 110 may determine the second partition from the RA resource partitions based on priorities configured for the RA resource partitions.
  • the terminal device 110 may determine the second partition by considering that a feature of the reduced capability has the highest priority.
  • the terminal device 110 may determine the second partition by considering that a priority of a partition comprising a feature of the reduced capability is higher than a priority of a partition comprising a feature of a non-reduced capability.
  • the terminal device 110 may determine the second partition by allowing to select a partition comprising a feature of the reduced capability.
  • FIG. 8 illustrates an example method 800 of communication implemented at a terminal device in accordance with some embodiments of the present disclosure.
  • the method 800 may be performed at the terminal device 110 as shown in FIG. 1.
  • the method 800 will be described with reference to FIG. 1. It is to be understood that the method 800 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
  • the terminal device 110 receives a configuration of a RA procedure, the configuration indicating that the RA procedure is to be started from one of CE eligibility check, a RA type selection or a RA resource partition selection.
  • the configuration may comprise a first threshold number configured for the earliest one of the CE eligibility check, the RA type selection and the RA resource partition selection, a second threshold number configured for the second-earliest one of the CE eligibility check, the RA type selection and the RA resource partition selection, and a third threshold number configured for the latest one of the CE eligibility check, the RA type selection and the RA resource partition selection.
  • the second threshold number is greater than the third threshold number and is smaller than the first threshold number.
  • the terminal device 110 determines whether the number of unsuccessful RA attempts for the RA procedure is greater than or equal to a threshold number. If the number of unsuccessful RA attempts is greater than or equal to the threshold number, the method 800 proceeds to block 830.
  • the terminal device 110 performs the RA procedure based on the configuration.
  • the configuration comprise the first to third threshold numbers and the second threshold number is greater than the third threshold number and is smaller than the first threshold number
  • the terminal device 110 may cause the RA procedure to be started from the latest one of the CE eligibility check, the RA type selection and the RA resource partition selection.
  • the terminal device 110 may cause the RA procedure to be started from the second-earliest one of the CE eligibility check, the RA type selection and the RA resource partition selection.
  • the terminal device 110 may cause the RA procedure to be started from the earliest one of the CE eligibility check, the RA type selection and the RA resource partition selection.
  • a fallback of a RA procedure may be achieved under network control.
  • Other details are similar with that described in connection with FIGs. 5 to 6D and thus are not repeated here for concise.
  • FIG. 9 illustrates an example method 900 of communication implemented at a network device in accordance with some embodiments of the present disclosure.
  • the method 900 may be performed at the network device 120 as shown in FIG. 1.
  • the method 900 will be described with reference to FIG. 1. It is to be understood that the method 900 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
  • the network device 120 transmits a configuration used for switching among RA resource partitions.
  • the configuration may comprise at least one of the following: a first indication indicating whether a partition in the RA resource partitions is allowed to be switched, a second indication indicating a candidate partition associated with the partition, or a third indication indicating whether a feature applicable to the RA resource partitions is allowed to be switched.
  • the feature may comprise at least one of the following: CE, non-CE, reduced capability, SDT, non-SDT, slice specific, non-slice specific, PRACH repetitions using the same beam, PRACH repetitions using different beams, message 3 repetition, or non-message 3 repetition.
  • CE non-CE
  • SDT non-SDT
  • slice specific non-slice specific
  • the configuration may further comprise priorities configured for the RA resource partitions or features applicable to the RA resource partitions.
  • the network device 120 performs a RA procedure based on the configuration.
  • a fallback among RA resource partitions may be configured. Other details are similar with that described in connection with FIGs. 2 to 4B and thus are not repeated here for concise.
  • FIG. 10 illustrates an example method 1000 of communication implemented at a network device in accordance with some embodiments of the present disclosure.
  • the method 1000 may be performed at the network device 120 as shown in FIG. 1.
  • the method 1000 will be described with reference to FIG. 1. It is to be understood that the method 1000 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard.
  • the network device 120 transmits a configuration of a RA procedure, the configuration indicating that the RA procedure is to be started from one of CE eligibility check, a RA type selection or a RA resource partition selection.
  • the network device 120 performs the RA procedure based on the configuration.
  • the configuration may comprise a first threshold number configured for the earliest one of the CE eligibility check, the RA type selection and the RA resource partition selection, a second threshold number configured for the second-earliest one of the CE eligibility check, the RA type selection and the RA resource partition selection, and a third threshold number configured for the latest one of the CE eligibility check, the RA type selection and the RA resource partition selection.
  • the second threshold number is greater than the third threshold number and is smaller than the first threshold number.
  • a fallback of a RA procedure may be configured.
  • Other details are similar with that described in connection with FIGs. 5 to 6D and thus are not repeated here for concise.
  • FIG. 11 is a simplified block diagram of a device 1100 that is suitable for implementing embodiments of the present disclosure.
  • the device 1100 can be considered as a further example implementation of the terminal device 110 or the network device 120 as shown in FIG. 1. Accordingly, the device 1100 can be implemented at or as at least a part of the terminal device 110 or the network device 120.
  • the device 1100 includes a processor 1110, a memory 1120 coupled to the processor 1110, a suitable transmitter (TX) and receiver (RX) 1140 coupled to the processor 1110, and a communication interface coupled to the TX/RX 1140.
  • the memory 1110 stores at least a part of a program 1130.
  • the TX/RX 1140 is for bidirectional communications.
  • the TX/RX 1140 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones.
  • the communication interface may represent any interface that is necessary for communication with other network elements, such as X2/Xn interface for bidirectional communications between eNBs/gNBs, S1/NG interface for communication between a Mobility Management Entity (MME) /Access and Mobility Management Function (AMF) /SGW/UPF and the eNB/gNB, Un interface for communication between the eNB/gNB and a relay node (RN) , or Uu interface for communication between the eNB/gNB and a terminal device.
  • MME Mobility Management Entity
  • AMF Access and Mobility Management Function
  • RN relay node
  • Uu interface for communication between the eNB/gNB and a terminal device.
  • the program 1130 is assumed to include program instructions that, when executed by the associated processor 1110, enable the device 1100 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGs. 1 to 10.
  • the embodiments herein may be implemented by computer software executable by the processor 1110 of the device 1100, or by hardware, or by a combination of software and hardware.
  • the processor 1110 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 1110 and memory 1120 may form processing means 1150 adapted to implement various embodiments of the present disclosure.
  • the memory 1120 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 1120 is shown in the device 1100, there may be several physically distinct memory modules in the device 1100.
  • the processor 1110 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 1100 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.
  • a terminal device comprises a circuitry configured to: receive a configuration used for switching among random access resource partitions; and in accordance with a determination that the number of unsuccessful random access attempts for a random access procedure based on a first partition in the random access resource partitions is greater than or equal to a threshold number, determine, based on the configuration, whether switching from the first partition to a second partition in the random access resource partitions is allowed; and in accordance with a determination that the switching from the first partition to the second partition is allowed, performs the random access procedure based on the second partition.
  • the configuration comprises at least one of the following: a first indication indicating whether a partition in the random access resource partitions is allowed to be switched, a second indication indicating a candidate partition associated with the partition, or a third indication indicating whether a feature applicable to at least one of the random access resource partitions is allowed to be changed.
  • the feature comprises at least one of the following: CE, non-CE, reduced capability, SDT, non-SDT, slice specific, non-slice specific, PRACH repetitions using the same beam, PRACH repetitions using different beams, message 3 repetition, or non-message 3 repetition.
  • the circuitry may be configured to determine whether the switching from the first partition to the second partition is allowed by determining whether the first partition is allowed to be switched; and in accordance with a determination that the first partition is allowed to be switched, determining the second partition from the random access resource partitions.
  • the circuitry may be configured to determine whether the first partition is allowed to be switched by: in accordance with a determination that a candidate partition associated with the first partition is indicated, determining that the first partition is allowed to be switched.
  • the circuitry may be configured to determine whether the first partition is allowed to be switched by: in accordance with a determination that a feature is configured in the first partition and the feature is allowed to be changed, determining that the first partition is allowed to be switched.
  • the circuitry may be configured to determine the second partition by: in accordance with a determination that the configuration comprises a candidate partition associated with the first partition, determining the candidate partition as the second partition.
  • the circuitry may be configured to determine the second partition by: obtaining a candidate partition by changing a set of features comprised in the first partition, the set of features being allowed to be changed; in accordance with a determination that the candidate partition is comprised in the random access resource partitions, determining the candidate partition as the second partition; and in accordance with a determination that the candidate partition is not comprised in the random access resource partitions, determining the second partition from the random access resource partitions by changing a feature in the set of features based on priorities configured for the set of features.
  • the circuitry may be configured to determine the second partition by: obtaining a candidate partition by changing a set of features comprised in the first partition, the set of features being allowed to be changed; in accordance with a determination that the candidate partition is comprised in the random access resource partitions, determining the candidate partition as the second partition; and in accordance with a determination that the candidate partition is not comprised in the random access resource partitions, determining the second partition from the random access resource partitions based on priorities configured for the random access resource partitions.
  • the circuitry may be configured to determine the second partition by: in accordance with a determination that the terminal device is a terminal device with reduced capability and an identification of the terminal device is required in a preamble transmission, determining the second partition by considering that a feature of the reduced capability has the highest priority.
  • the circuitry may be configured to determine the second partition by: in accordance with a determination that the terminal device is a terminal device with reduced capability and an identification of the terminal device is required in a preamble transmission, determining the second partition by considering that a priority of a partition comprising a feature of the reduced capability is higher than a priority of a partition comprising a feature of a non-reduced capability.
  • the circuitry may be configured to determine the second partition by: in accordance with a determination that the terminal device is a terminal device with reduced capability and an identification of the terminal device is unrequired in a preamble transmission, determining the second partition by allowing to select a partition comprising a feature of the reduced capability.
  • a terminal device comprises a circuitry configured to: receive a configuration of a random access procedure, the configuration indicating that the random access procedure is to be started from one of coverage enhancement eligibility check, a random access type selection or a random access resource partition selection; and in accordance with a determination that the number of unsuccessful random access attempts for the random access procedure is greater than or equal to a threshold number, perform the random access procedure based on the configuration.
  • the configuration comprises a first threshold number configured for the earliest one of the coverage enhancement eligibility check, the random access type selection and the random access resource partition selection, a second threshold number configured for the second-earliest one of the coverage enhancement eligibility check, the random access type selection and the random access resource partition selection, and a third threshold number configured for the latest one of the coverage enhancement eligibility check, the random access type selection and the random access resource partition selection, wherein the second threshold number is greater than the third threshold number and is smaller than the first threshold number.
  • the circuitry may be configured to perform the random access procedure by: in accordance with a determination that the number of unsuccessful random access attempts for the random access procedure is greater than or equal to the third threshold number and is smaller than the second threshold number, causing the random access procedure to be started from the latest one of the coverage enhancement eligibility check, the random access type selection and the random access resource partition selection; in accordance with a determination that the number of unsuccessful random access attempts for the random access procedure is greater than or equal to the second threshold number and is smaller than the first threshold number, causing the random access procedure to be started from the second-earliest one of the coverage enhancement eligibility check, the random access type selection and the random access resource partition selection; and in accordance with a determination that the number of unsuccessful random access attempts for the random access procedure is greater than or equal to the first threshold number, causing the random access procedure to be started from the earliest one of the coverage enhancement eligibility check, the random access type selection and the random access resource partition selection.
  • a network device comprises a circuitry configured to: transmit a configuration used for switching among random access resource partitions; and perform a random access procedure based on the configuration.
  • the configuration comprises at least one of the following: a first indication indicating whether a partition in the random access resource partitions is allowed to be switched, a second indication indicating a candidate partition associated with the partition, or a third indication indicating whether a feature applicable to at least one of the random access resource partitions is allowed to be changed.
  • the feature comprises at least one of the following: CE, non-CE, reduced capability, SDT, non-SDT, slice specific, non-slice specific, PRACH repetitions using the same beam, PRACH repetitions using different beams, message 3 repetition, or non-message 3 repetition.
  • the configuration further comprises priorities configured for the random access resource partitions or features applicable to the random access resource partitions.
  • a network device comprises a circuitry configured to: transmit a configuration of a random access procedure, the configuration indicating that the random access procedure is to be started from one of coverage enhancement eligibility check, a random access type selection or a random access resource partition selection; and perform the random access procedure based on the configuration.
  • the configuration comprises a first threshold number configured for the earliest one of the coverage enhancement eligibility check, the random access type selection and the random access resource partition selection, a second threshold number configured for the second-earliest one of the coverage enhancement eligibility check, the random access type selection and the random access resource partition selection, and a third threshold number configured for the latest one of the coverage enhancement eligibility check, the random access type selection and the random access resource partition selection, and wherein the second threshold number is greater than the third threshold number and is smaller than the first threshold number.
  • circuitry used herein may refer to hardware circuits and/or combinations of hardware circuits and software.
  • the circuitry may be a combination of analog and/or digital hardware circuits with software/firmware.
  • the circuitry may be any portions of hardware processors with software including digital signal processor (s) , software, and memory (ies) that work together to cause an apparatus, such as a terminal device or a network device, to perform various functions.
  • the circuitry may be hardware circuits and or processors, such as a microprocessor or a portion of a microprocessor, that requires software/firmware for operation, but the software may not be present when it is not needed for operation.
  • the term circuitry also covers an implementation of merely a hardware circuit or processor (s) or a portion of a hardware circuit or processor (s) and its (or their) accompanying software and/or firmware.
  • 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 representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods 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 process or method as described above with reference to FIGs. 1 to 10.
  • 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 above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the machine readable medium may be a machine readable signal medium or a machine readable storage medium.
  • a machine 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.
  • machine readable storage medium More specific examples of the machine 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.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.

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

Abstract

Des modes de réalisation de la présente divulgation concernent des procédés, des dispositifs et des supports lisibles par ordinateur de communication. Un dispositif terminal reçoit une configuration utilisée pour commuter entre des partitions de ressources RA. Si le nombre de tentatives RA infructueuses pour une procédure RA sur la base d'une première partition dans les partitions de ressources RA est supérieur ou égal à un nombre seuil, le dispositif terminal détermine, sur la base de la configuration, si une commutation de la première partition vers une seconde partition dans les partitions de ressources RA est autorisée. Si la commutation de la première partition vers la seconde partition est autorisée, le dispositif terminal effectue la procédure RA sur la base de la seconde partition. De cette manière, une procédure de secours parmi des partitions de ressources RA est prise en charge.
PCT/CN2022/079776 2022-03-08 2022-03-08 Procédé, dispositif et support de stockage informatique de communication WO2023168603A1 (fr)

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