Mechanism for logical channel prioritization
A network-configured LCH restriction policy with a remaining time threshold separates resource allocation into two steps to prioritize delay-critical data, addressing the challenge of timely transmission in XR services and reducing packet discards in NR systems.
Patent Information
- Application Number
- PCT/CN2024/110236
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2026-02-12
AI Technical Summary
Existing Logical Channel Prioritization (LCP) mechanisms in NR do not adequately address the challenge of ensuring timely transmission of delay-critical data in XR services, leading to potential packet discards due to insufficient consideration of remaining time thresholds.
Implement a network-configured LCH restriction policy that utilizes a remaining time threshold to prioritize resource allocation for logical channels, separating the process into two steps based on whether the data's remaining time is below or above the threshold, ensuring delay-critical data is transmitted first.
This approach enhances the timely transmission of delay-critical data by prioritizing it in the initial resource allocation step, reducing packet discards and improving the overall performance of XR services in New Radio (NR) systems.
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Figure CN2024110236_12022026_PF_FP_ABST
Abstract
Description
MECHANISM FOR LOGICAL CHANNEL PRIORITIZATIONFIELD
[0001] Various example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, devices, apparatuses and computer readable storage medium for logical channel prioritization.BACKGROUND
[0002] EXtended Reality (XR) is a use case and service which may be considered important for New Radio (NR) in the third-generation partnership project (3GPP) Release 18 (Rel-18) and beyond. Although XR presents a set of attractive use cases for future mobile systems, they impose a set of challenges for NR. For example, both DL and UL traffic in the XR use case are characterized by a relatively strict packet delay budget (PDB) .
[0003] In addition, in NR, Logical Channel Prioritization (LCP) may be applied where a prioritized bit rate (PBR) may be configured to each logical channel (LCH) . Some LCP enhancements may be designed to better support such challenging services as the XR use case.SUMMARY
[0004] In a first aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus to: receive, from a second apparatus, an indication for enabling a restriction configuration for logical channel prioritization that comprises a remaining time threshold; compare a remaining time that is used for determining data discarding of to-be-transmitted data on a logical channel with the remaining time threshold in the restriction configuration; and based on a determination that the remaining time is below or equal to the remaining time threshold, perform a resource allocation to the logical channel at least in a first step of a resource allocation procedure; or based at least on a determination that the remaining time is above the remaining time threshold, perform the resource allocation to the logical channel in a second step of the resource allocation procedure.
[0005] In a second aspect of the present disclosure, there is provided a second apparatus. The second apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second apparatus to: transmit, to a first apparatus, a restriction configuration for logical channel prioritization that comprises a remaining time threshold for a logical channel; and transmit, to the first apparatus, an indication for enabling the restriction configuration for logical channel prioritization.
[0006] In a third aspect of the present disclosure, there is provided a method. The method comprises: receiving, from a second apparatus, an indication for enabling a restriction configuration for logical channel prioritization that comprises a remaining time threshold; comparing a remaining time that is used for determining data discarding of to-be-transmitted data on a logical channel with the remaining time threshold in the restriction configuration; and based on a determination that the remaining time is be low or equal to the remaining time threshold, performing a resource allocation to the logical channel at least in a first step of a resource allocation procedure; or based at least on a determination that the remaining time is above the remaining time threshold, performing the resource allocation to the logical channel in a second step of the resource allocation procedure.
[0007] In a fourth aspect of the present disclosure, there is provided a method. The method comprises: transmitting, to a first apparatus, a restriction configuration for logical channel prioritization that comprises a remaining time threshold for a logical channel; and transmitting, to the first apparatus, an indication for enabling the restriction configuration for logical channel prioritization.
[0008] In a fifth aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises means for receiving, from a second apparatus, an indication for enabling a restriction configuration for logical channel prioritization that comprises a remaining time threshold; means for comparing a remaining time that is used for determining data discarding of to-be-transmitted data on a logical channel with the remaining time threshold in the restriction configuration; and means for based on a determination that the remaining time is below or equal to the remaining time threshold, performing a resource allocation to the logical channel at least in a first step of a resource allocation procedure; or means for based at least on a determination that the remaining time is above the remaining time threshold, performing the resource allocation to the logical channel in a second step of the resource allocation procedure.
[0009] In a sixth aspect of the present disclosure, there is provided a second apparatus. The second apparatus comprises means for transmitting, to a first apparatus, a restriction configuration for logical channel prioritization that comprises a remaining time threshold for a logical channel; and means for transmitting, to the first apparatus, an indication for enabling the restriction configuration for logical channel prioritization.
[0010] In a seventh aspect of the present disclosure, there is provided a computer readable medium. The computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the third aspect.
[0011] In an eighth aspect of the present disclosure, there is provided a computer readable medium. The computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the fourth aspect.
[0012] It is to be understood that the Summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Some example embodiments will now be described with reference to the accompanying drawings, where:
[0014] FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented;
[0015] FIG. 2 illustrates a schematic diagram of last available uplink (UL) slot for logical channel (LCH) 2 to transmit data before PDCP discard timer expiration;
[0016] FIG. 3 illustrates a schematic diagram of logical channel prioritization (LCP) procedure without considering delay-aware LCP;
[0017] FIG. 4 illustrates a signaling flow of resource allocation in accordance with some example embodiments of the present disclosure;
[0018] FIG. 5 illustrates a flowchart of resource allocation in accordance with some example embodiments of the present disclosure;
[0019] FIG. 6 illustrates a schematic diagram of resource allocation in accordance with some example embodiments of the present disclosure;
[0020] FIG. 7 illustrates a flowchart of a method implemented at a first apparatus in accordance with some example embodiments of the present disclosure;
[0021] FIG. 8 illustrates a flowchart of a method implemented at a second apparatus in accordance with some example embodiments of the present disclosure;
[0022] FIG. 9 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure; and
[0023] FIG. 10 illustrates a block diagram of an example computer readable medium in accordance with some example embodiments of the present disclosure.
[0024] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0025] Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. Embodiments described herein can be implemented in various manners other than the ones described below.
[0026] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0027] References in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
[0028] It shall be understood that although the terms “first, ” “second, ” ..., etc. in front of noun (s) and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another and they do not limit the order of the noun (s) . For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0029] As used herein, “at least one of the following: <a list of two or more elements>” and “at least one of <a list of two or more elements>” and similar wording, where the list of two or more elements are joined by “and” or “or” , mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.
[0030] As used herein, unless stated explicitly, performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.
[0031] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.
[0032] As used in this application, the term “circuitry” may refer to one or more or all of the following:
[0033] (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and
[0034] (b) combinations of hardware circuits and software, such as (as applicable) :
[0035] (i) a combination of analog and / or digital hardware circuit (s) with software / firmware and
[0036] (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
[0037] (c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.
[0038] This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term 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. The term 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.
[0039] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as New Radio (NR) , Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Intemet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, 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, the sixth generation (6G) communication protocols, and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.
[0040] As used herein, the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom. The network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , an NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, an Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, a non-terrestrial network (NTN) or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous earth orbit (GEO) satellite, an aircraft network device, and so forth, depending on the applied terminology and technology. In some example embodiments, radio access network (RAN) split architecture comprises a Centralized Unit (CU) and a Distributed Unit (DU) at an IAB donor node. An IAB node comprises a Mobile Terminal (IAB-MT) part that behaves like a UE toward the parent node, and a DU part of an IAB node behaves like a base station toward the next-hop IAB node.
[0041] The term “terminal device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) . The terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (IoT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. The terminal device may also correspond to a Mobile Termination (MT) part of an IAB node (e.g., a relay node) . In the following description, the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
[0042] As used herein, the term “resource, ” “transmission resource, ” “resource block, ” “physical resource block” (PRB) , “uplink resource, ” or “downlink resource” may refer to any resource for performing a communication, for example, a communication between a terminal device and a network device, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other combination of the time, frequency, space and / or code domain resource enabling a communication, and the like. In the following, unless explicitly stated, a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resourc es in other domains.
[0043] As described above, XR is the use cases and service which may be considered important for NR. XR relates to various types of augmented, virtual, and mixed environments, where human-to-machine and human-to-human communications are performed with the assistance of handheld and wearable end user devices (UEs) . XR may involve multiple heterogeneous use cases and services which may be divided into: (i) augmented reality (AR) ; (ii) virtual reality (VR) , and (iii) mixed reality (MR) .
[0044] XR presents a set of attractive use cases for future mobile systems, which impose a set of challenges for NR. For example, many of the XR use cases are characterized by quasi-periodic traffic (with possible jitter) with high data rate in downlink (DL) (for example, a video stream) combined with the frequent uplink (UL) traffic (for example, pose / control update and / or a video stream) . Both DL and UL traffic are also characterized by a relatively strict packet delay budget (PDB) . Hence, there is a need to study and potentially specify possible solutions to better support such challenging services.
[0045] FIG. 1 illustrates an example communication environment 100 in which example embodiments of the present disclosure can be implemented. In the communication environment 100, a plurality of communication devices, including a first apparatus 110 and a second apparatus 120, can communicate with each other.
[0046] In the following, for the purpose of illustration, some example embodiments are described with the first apparatus 110 operating as a terminal device such as a UE and the second apparatus 120 operating as a network device such as a gNB. However, in some example embodiments, operations described in connection with a terminal device may be implemented at a network device or other devices, and operations described in connection with a network device may be implemented at a terminal device or other devices.
[0047] In some example embodiments, if the first apparatus 110 is a terminal device and the second apparatus 120 is a network device, a link from the second apparatus 120 to the first apparatus 110 is referred to as a downlink (DL) , while a link from the first apparatus 110 to the second apparatus 120 is referred to as an uplink (UL) . In DL, the second apparatus 120 is a transmitting (TX) device (or a transmitter) and the first apparatus 110 is a receiving (RX) device (or a receiver) . In UL, the first apparatus 110 is a TX device (or a transmitter) and the second apparatus 120 is a RX device (or a receiver) . In some example embodiments, both the first and second apparatuses 110 and 120 may b e terminal devices which can communicate with each other in Sidelink (SL) .
[0048] Communications in the communication environment 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) , the sixth generation (6G) , and the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and / or any other protocols currently known or to be developed in the future. Moreover, the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple (OFDM) , Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and / or any other technologies currently known or to be developed in the future.
[0049] It is to be understood that the numbers of apparatuses are only for the purpose of illustration without suggesting any limitations. The communication environment 100 may include any suitable numbers of apparatuses for implementing embodiments of the present disclosure.
[0050] The first apparatus 110 and the second apparatus 120 may support XR services. In some example embodiments, the first apparatus 110 may use delay or deadline information for support of UL scheduling to enable high XR capacity while meeting delay requirements and avoiding too late PDUs. For example, the first apparatus 110 may perform LCH prioritization for the UL transmission to enable high XR capacity. In some mechanisms, Delay Status Report (DSR) has been defined for release (Rel) -18 XR with which the UE can report per logical channel group (LCG) the shortest remaining time of the buffered data and the amount of data with remaining time below a configured threshold.
[0051] In some mechanisms, the Logical Channel Prioritization (LCP) procedure is applied when a new transmission is performed. Specifically, RRC controls the scheduling of uplink data by signalling for each logical channel: -priority where an increasing priority value indicates a lower priority level; -prioritisedBitRate which sets the Prioritized Bit Rate (PBR) ; -bucketSizeDuration which sets the Bucket Size Duration (BSD) . RRC additionally controls the LCP procedure by configuring mapping restrictions for each logical channel: -allowedSCS-List which sets the allowed Subcarrier Spacing (s) for transmission; -maxPUSCH-Duration which sets the maximum PUSCH duration allowed for transmission; -configuredGrantType1Allowed which sets whether a configured grant Type 1 can be used for transmission; -allowedServingCells which sets the allowed cell (s) for transmission; -allowedCG-List which sets the allowed configured grant (s) for transmission; -allowedPHY-PriorityIndex which sets the allowed PHY priority index (es) of a dynamic grant for transmission; -allowedHARQ-mode which sets the allowed UL HARQ mode for transmission.
[0052] Further, the following UE variable is used for the Logical channel prioritization procedure: -Bj which is maintained for each logical channel j. The MAC entity may initialize Bj of the logical channel to zero when the logical channel is established. For each logical channel j, the MAC entity may: increment Bj by the product PBR × T before every instance of the LCP procedure, where T is the time elapsed since Bj was last incremented; if the value of Bj is greater than the bucket size (i.e. PBR × BSD) , set Bj to the bucket size. The exact moment (s) when the UE updates Bj between LCP procedures may be up to UE implementation, as long as Bj is up to date at the time when a grant is processed by LCP.
[0053] In some mechanisms, during selection of logical channels, the MAC entity shall, when a new transmission is performed:
[0054] 1> select the logical channels for each UL grant that satisfy all the following conditions:
[0055] 2> the set of allowed Subcarrier Spacing index values in allowedSCS-List, if configured, includes the Subcarrier Spacing index associated to the UL grant; and
[0056] 2> maxPUSCH-Duration, if configured, is larger than or equal to the PUSCH transmission duration associated to the UL grant; and
[0057] 2> configuredGrantType1Allowed, if configured, is set to true in case the UL grant is a Configured Grant Type 1; and
[0058] 2> allowedServingCells, if configured, includes the Cell information associated to the UL grant. Does not apply to logical channels associated with a DRB configured with PDCP duplication within the same MAC entity (i.e. CA duplication) when CA duplication is deactivated for this DRB in this MAC entity; and
[0059] 2> allowedCG-List, if configured, includes the configured grant index associated to the UL grant; and
[0060] 2> allowedPHY-PriorityIndex, if configured, includes the priority index (as specified in clause 9 of TS 38.213 [6] ) associated to the dynamic UL grant; and
[0061] 2> allowedHARQ-mode, if configured, includes the allowed UL HARQ mode for the HARQ process associated to the UL grant.
[0062] NOTE: The Subcarrier Spacing index, PUSCH transmission duration, Cell information, and priority index are included in Uplink transmission information received from lower layers for the corresponding scheduled uplink transmission.
[0063] In some mechanisms, before the successful completion of the Random Access procedure initiated for Dual Active Protocol Stack (DAPS) handover, the target MAC entity shall not select the logical channel (s) corresponding to non-DAPS data radio bearer (s) (DRB (s) ) for the uplink grant received in a Random Access Response or the uplink grant for the transmission of the message A (MSGA) payload. The source MAC entity shall select only the logical channel (s) corresponding to DAPS DRB (s) during DAPS handover. The MAC entity shall, when a new transmission is performed:
[0064] 1> allocate resources to the logical channels as follows:
[0065] 2> logical channels selected for the UL grant with Bj > 0 are allocated resources in a decreasing priority order. If the PBR of a logical channel is set to infinity, the MAC entity shall allocate resources for all the data that is available for transmission on the logical channel before meeting the PBR of the lower priority logical channel (s) ;
[0066] 2> decrement Bj by the total size of MAC SDUs served to logical channel j above;
[0067] 2> if any resources remain, all the logical channels are served in a strict decreasing priority order (regardless of the value of Bj) until either the data for that logical channel or the UL grant is exhausted, whichever comes first. Logical channels configured with equal priority should be served equally.
[0068] In some mechanisms, delay-aware LCP enhancement to resolve the issue of data with low remaining time being delayed due to data from other LCHs with no delay critical data is proposed in XR. For delay-aware LCP enhancement, the following option may be considered to override / adjust the priority of LCH based on delay / deadline information as a baseline: Use additional priority configured to LCHs in case of these LCHs with delay-critical data. Further, it may assume that no dynamic indications are needed for triggering the delay-aware LCP mechanism and this mechanism is configured in a semi-static way.
[0069] In some solutions, LCP procedure may be based on Bj and strict priority order of LCHs. After LCH selection, the eligible LCHs with Bj > 0 are served in strict LCH priority order (i.e., LCHs with higher priority first) . Since the remaining delay budget is not considered in the LCP procedure, transmission of delay critical data of a low-priority LCH can be prevented by non-delay critical data of a high-priority LCH. This can also occur if an UL grant is given by the gNB according to the buffer size (BS) reported in a delay status report (DSR) , as the DSR only reports delay-critical data. It means that delay-critical data is not guaranteed to be multiplexed in the corresponding medium access control (MAC) protocol data unit (PDU) first, leading to certain PDUs or PDU sets being discarded due to the expiration of the PDCP discard timer.
[0070] An example of a case when delay-aware LCP is needed is depicted in FIG. 2. It assumes numerology value of μ = 1 (i.e., subcarrier spacing (SCS) = 30 kHz) and a downlink-downlink-downlink-special-uplink (DDDSU) frame structure. Additionally, it assumes a PDCP discard timer of 20 ms, which gives the UE at maximum 7 UL slots to transmit a PDCP SDU before discarding occurs (i.e., it assumes the PSCP SDU arrives in the UE buffer at the beginning of / during an UL slot, and therefore, the corresponding UL slot cannot be used for transmitting the PDCP SDU) . It assumes that all LCHs within the UE carry guaranteed bit (GBR) data (i.e., prioritisedBitRate is configured to be larger than zero for the corresponding LCH) and at the last UL slot prior the PDCP discard timer expiration, a LCH has not transmitted the data that will be discarded if it is not transmitted in that UL slot (i.e., P7 in FIG. 3) . In that slot, the LCP procedure is run as depicted in FIG. 3. The PDCP SDU belongs to LCH2 and there can be other UE’s data in the buffer with higher priority (e.g., data belonging to LCH1 and LCH3) . If the LCP procedure does not apply delay-aware LCP, LCH2 may not be able to transmit data before the PDCP discard timer expires, since it is the last opportunity for P7.
[0071] There are no detailed solutions on enhancing the LCP. Also, some of the proposed solutions do not fulfill some agreements. Therefore, new solutions on LCP are needed.
[0072] According to some example embodiments of the present disclosure, it proposes a network (NW) configured LCH restriction policy for LCHs carrying non-delay critical data, and which is in line with the agreements. In particular, the present disclosure relates to scheduling enhancements for XR applications with focus on logical channel prioritization (LCP) restrictions to improve UL scheduling using delay information. Example embodiments of the present disclosure investigate the usage of the UL grant by the different LCHs in the UE carrying different kinds of data and address the issue of data with low remaining time being delayed due to data from other LCHs with no delay critical data.
[0073] Example embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Reference is made to FIG. 4, which illustrates a signaling flow 400 for resource allocation in accordance with some embodiments of the present disclosure. For the purpose of discussion, the signaling flow 400 will be discussed with reference to FIG. 1, for example, by using the first apparatus 110 and the second apparatus 120. It is noted that the order of acts / steps shown in FIG. 4 is only an example not limitation.
[0074] The first apparatus 110 may obtain (4010) a restriction configuration for LCP. In some example embodiments, the restriction configuration may be per logical channel and configured by the second apparatus 120 to the first apparatus 110. For example, the restriction configuration may be a part of logical channel configuration.
[0075] In some example embodiments, the second apparatus 120 may transmit (4010') the restriction configuration for LCP to the first apparatus 110. That is, the first apparatus 110 may receive (4010') the restriction configuration for LCP from the second apparatus 120. For example, the restriction configuration may be transmitted via radio resource control signaling. Alternatively, the restriction configuration (such as, LCP_restrict) may be preconfigured at the first apparatus 110.
[0076] The restriction configuration for LCP includes a remaining time threshold. For example, the remaining time threshold may be compared with the smallest remaining value of the running PDCP discardTimers among all the SDUs buffered for a LCH that has not been transmitted in any MAC PDU and has been reported as data volume in a DSR MAC CE. The second apparatus 120 may determine a value of the remaining time threshold. For example, the value of the remaining time threshold may be same as a value used for triggering a DSR. It is noted that the value of the remaining time may be any suitable value.
[0077] In some example embodiments, the restriction configuration indicates that resources are allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time is below or equal to the remaining time threshold. For example, the restriction configuration may indicate that a logical channel j should fulfill the following conditions to be processed in the first step of the LCP procedure: (1) Bj > 0 and (2) RTj < RT threshold and the LCH is configured with the feature of skipping first step if no delay critical data buffered (e.g. FirstStepRestriction) , where RTj is the smallest remaining value of the running PDCP discardTimers among all the SDUs buffered for LCH j that has not been transmitted in any MAC PDU and has been reported as data volume in a DSR MAC CE, and j is an integer.
[0078] Alternatively, or in addition, the restriction configuration indicates that resources are not allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time is above the remaining time threshold. In other words, LCHs having remaining time above the remaining time threshold established in LCP_restrict may not participate in the first step of the LCP procedure. Furthermore, the restriction configuration indicates that resources are allocated to the logical channel in the second step of the resource allocation procedure, in response to that there is one or more available resources after resource allocation to other logical channels with higher priority than the logical channel is completed. In this way, LCHs with delay critical data are prioritized in the first round of the LCP procedure, but still allow the LCHs with only non-delay critical data to be processed in the second round if any space left. In some other example embodiments, the restriction configuration may indicate that the whole LCP is skipped instead of only the first step, in response to that the remaining time is above the remaining time threshold. In some example embodiments, different remaining time thresholds may be configured to skip the first step of the whole LCP procedure.
[0079] The second apparatus 120 transmits (4020) an indication for enabling the restriction configuration to the first apparatus 110. That is, the first apparatus 110 receives (4020) the indication for enabling the restriction configuration from the second apparatus 120. For example, the restriction configuration may be applied in a semi-static manner. The first apparatus 110 may apply the restriction configuration based on the received indication. In some example embodiments, the indication may be transmitted in a RRC configuration. For example, the indication may be a flag (such as, FirstStepRestriction) that is used to enable or disable the restriction configuration and the remaining time threshold.
[0080] The first apparatus 110 compares (4030) a remaining time that is used for determining data discarding of to-be-transmitted data on a logical channel with the remaining time threshold. For example, the remaining time is related to a packet data convergence protocol, PDCP, discard timer corresponding to a service data unit, SDU, associated with the to-be-transmitted data on the logical channel.
[0081] The first apparatus 110 performs (4040) a resource allocation to the logical channel based on a result of the comparison and the restriction configuration for LCP. For example, if the remaining time is below or equal to the remaining time threshold, the first apparatus 110 may perform (4040) the resource allocation to the logical channel at least in a first step of a resource allocation procedure. Alternatively, if the remaining time is above the remaining time threshold, the first apparatus 110 may perform (4040) the resource allocation to the logical channel in a second step of the resource allocation procedure. For example, if there is one or more available resources after resource allocation to other logical channels with higher priority than the logical channel is completed, resources may be allocated to the logical channel in the second step of the resource allocation procedure. In this way, it does not require intra-LCH prioritization with different handling of delay critical data and non-delay critical data within a LCH. It simplifies the implementation by reducing complexity. Table 1 below shows an example procedure of the allocation resources according to example embodiments of the present disclosure.
[0082] Table 1
[0083] FIG. 5 illustrates a flowchart of resource allocation in accordance with some example embodiments of the present disclosure. Example embodiments of the resource allocation are described with reference to FIG. 5 and FIG. 6.
[0084] At block 510, the first apparatus 110 may receive the restriction configuration (LCP_Restrict) from the second apparatus 120. At block 520, the first apparatus 110 may determine whether the first step restriction (i.e., the restriction configuration) is enabled.
[0085] At block 530, if the first step restriction is enabled, the first apparatus 110 may determine whether Bj > 0 &&RTj ≤ RT. In this case, if Bj > 0 &&RTj ≤ RT, the first apparatus 110 may allocate resources to the logical channel in the first step LCP procedure. If Bj < 0 and / or RTj > RT, the first apparatus 110 may allocate resources to the logical channel in the second step of LCP procedure, at block 550. In some example embodiments, ifthere are one or more available resources left after the first step, the first apparatus 110 may, at block 550, perform the resource allocation in the second step of the LCP procedure. For example, as shown in FIG. 6, the LCH 610 has priority 1 which is the highest, the LCH 630 has priority 3 which is the lowest, and the LCH 620 has priority 2. In this case, when the LCH 610 has the delay-critical data 6007 whose remaining time is below or equal to the remaining threshold and the first step restriction is enabled, the first apparatus 110 may allocate resources for data 6006 on the LCH 610 in the first step 601 of the LCP procedure, at block 540. The first apparatus may then, at block 550, allocate resources for data 6007 on the LCH 610, data 6008, 6009, 6010, 6011, 6012, 6013 and 6014 on the LCH 620 and data 6015, 6016 and 6017 on the LCH 630 in the second step 602 of the LCP procedure.
[0086] Alternatively, if the first step restriction is not enabled, the first apparatus 110 may, at block 540, perform the resource allocation in the first step of the LCP procedure. For example, as shown in FIG. 6, if the first step restriction is not enabled, the first apparatus 110 allocate resources for data 6006 on the LCH 610, data 6008, 6009, 6010, 6011, and 6012 on the LCH 620 and data 6015, 6016, 6017, 6018, 6019 and 6020 on the LCH 630 in the first step 601' of the LCP procedure. In some example embodiments, if there are one or more available resources left after the first step, the first apparatus 110 may perform the resource allocation in the second step of LCP procedure at block 550.
[0087] Referring back to FIG. 4, the second apparatus 120 may transmit (4050) information indicating an updated parameter in the restriction configuration. That is, the first apparatus 110 may receive (4050) the information indicating the updated parameter from the second apparatus 120. In some example embodiments, the information may indicate an updated remaining time threshold. In some other example embodiments, the information may indicate any change of certain parameters within the restriction configuration. For example, the information may include the indication for disabling the restriction configuration.
[0088] In some example embodiments, the information may be transmitted in RRC reconfiguration. Alternatively, the information may be transmitted in medium access control (MAC) control element (CE) . In some other example embodiments, the information may be transmitted in downlink control information (DCI) .
[0089] According to example embodiments of the present disclosure, it proposes a new LCH restriction policy, in the LCP procedure, such that LCHs not having delay-critical data, are restricted from being allocated resources during the first step of the LCP procedure (i.e., when resources are allocated to meet the PBR of each logical channel in strict LCH priority order) . In this way, it can prevent LCHs without delay-critical data from being allocated resources in the first step of the LCP procedure.
[0090] FIG. 7 shows a flowchart of an example method 700 implemented at a first apparatus in accordance with some example embodiments of the present disclosure. For example, the method 700 may be implemented at the first apparatus 110 in FIG. 1.
[0091] At block 710, the first apparatus receives, from a second apparatus, an indication for enabling a restriction configuration for logical channel prioritization that comprises a remaining time threshold.
[0092] At block 720, the first apparatus compares a remaining time that is used for determining data discarding of to-be-transmitted data on a logical channel with the remaining time threshold in the restriction configuration.
[0093] At block 730, based on a determination that the remaining time is below or equal to the remaining time threshold, the first apparatus performs a resource allocation to the logical channel at least in a first step of a resource allocation procedure.
[0094] At block 740, based at least on a determination that the remaining time is above the remaining time threshold, the first apparatus performs the resource allocation to the logical channel in a second step of the resource allocation procedure.
[0095] In some example embodiments, the remaining time is related to a packet data convergence protocol, PDCP, discard timer corresponding to a service data unit, SDU, associated with the to-be-transmitted data on the logical channel.
[0096] In some example embodiments, the restriction configuration indicates that resources are allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time is below or equal to the remaining time threshold.
[0097] In some example embodiments, the restriction configuration indicates that resources are not allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time is above the remaining time threshold.
[0098] In some example embodiments, the restriction configuration indicates that resources are allocated to the logical channel in the second step of the resource allocation procedure, in response to that there is one or more available resources after resource allocation to other logical channels with higher priority than the logical channel is completed.
[0099] In some example embodiments, a value of the remaining time threshold is same as that used for triggering a delay status report.
[0100] In some example embodiments, the restriction configuration for logical channel prioritization is configured per logical channel.
[0101] In some example embodiments, the method 700 further comprises: receiving, from the second apparatus, the restriction configuration for logical channel prioritization via radio resource control signaling.
[0102] In some example embodiments, the method 700 further comprises: receiving, from a second apparatus, information indicating an updated parameter in the restriction configuration, wherein the information is in one of: a radio resource control configuration, a medium access control control element, or downlink control information.
[0103] In some example embodiments, the first apparatus is a terminal device, and the second apparatus is a network device.
[0104] FIG. 8 shows a flowchart of an example method 800 implemented at a second apparatus in accordance with some example embodiments of the present disclosure. For example, the method 800 may be implemented at the second apparatus 120 in FIG. 1.
[0105] At block 810, the second apparatus transmits, to a first apparatus, a restriction configuration for logical channel prioritization that comprises a remaining time threshold for a logical channel.
[0106] At block 820, the second apparatus transmits, to the first apparatus, an indication for enabling the restriction configuration for logical channel prioritization.
[0107] In some example embodiments, remaining time for to-be-transmitted data on the logical channel is related to a packet data convergence protocol, PDCP, discard timer corresponding to a service data unit, SDU, associated with the to-be-transmitted data on the logical channel.
[0108] In some example embodiments, the restriction configuration indicates that resources are allocated to the logical channel in the first step of the resource allocation procedure, in response to that remaining time for the to-be-transmitted data is below or equal to the remaining time threshold.
[0109] In some example embodiments, the restriction configuration indicates that resources are not allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time for the to-be-transmitted data is above the remaining time threshold.
[0110] In some example embodiments, the restriction configuration indicates that resources are allocated to the logical channel in the second step of the resource allocation procedure, in response to that there is one or more available resources after resource allocation to other logical channels with higher priority than the logical channel is completed.
[0111] In some example embodiments, a value of the remaining time threshold is same as that used for triggering a delay status report.
[0112] In some example embodiments, the restriction configuration for logical channel prioritization is configured per logical channel.
[0113] In some example embodiments, the restriction configuration for logical channel prioritization is transmitted via radio resource control signaling.
[0114] In some example embodiments, the method 800 further includes transmitting, to the first apparatus, information indicating an updated parameter in the restriction configuration, wherein the information is in one of: a radio resource control configuration, a medium access control control element (MAC CE) , or downlink control information.
[0115] In some example embodiments, the first apparatus is a terminal device, and the second apparatus is a network device.
[0116] In some example embodiments, a first apparatus capable of performing any of the method 700 (for example, the first apparatus 110 in FIG. 1) may comprise means for performing the respective operations of the method 700. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The first apparatus may be implemented as or included in the first apparatus 110 in FIG. 1.
[0117] In some example embodiments, the first apparatus comprises means for receiving, from a second apparatus, an indication for enabling a restriction configuration for logical channel prioritization that comprises a remaining time threshold; means for comparing a remaining time that is used for determining data discarding of to-be-transmitted data on a logical channel with the remaining time threshold in the restriction configuration; and means for based on a determination that the remaining time is below or equal to the remaining time threshold, performing a resource allocation to the logical channel at least in a first step of a resource allocation procedure; or means for based at least on a determination that the remaining time is above the remaining time threshold, performing the resource allocation to the logical channel in a second step of the resource allocation procedure.
[0118] In some example embodiments, the remaining time is related to a packet data convergence protocol, PDCP, discard timer corresponding to a service data unit, SDU, associated with the to-be-transmitted data on the logical channel.
[0119] In some example embodiments, the restriction configuration indicates that resources are allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time is below or equal to the remaining time threshold.
[0120] In some example embodiments, the restriction configuration indicates that resources are not allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time is above the remaining time threshold.
[0121] In some example embodiments, the restriction configuration indicates that resources are allocated to the logical channel in the second step of the resource allocation procedure, in response to that there is one or more available resources after resource allocation to other logical channels with higher priority than the logical channel is completed.
[0122] In some example embodiments, a value of the remaining time threshold is same as that used for triggering a delay status report.
[0123] In some example embodiments, the restriction configuration for logical channel prioritization is configured per logical channel.
[0124] In some example embodiments, the first apparatus further comprises: means for receiving, from the second apparatus, the restriction configuration for logical channel prioritization via radio resource control signaling.
[0125] In some example embodiments, the first apparatus further comprises: means for receiving, from a second apparatus, information indicating an updated parameter in the restriction configuration, wherein the information is in one of: a radio resource control configuration, a medium access control control element (MAC CE) , or downlink control information.
[0126] In some example embodiments, the first apparatus is a terminal device, and the second apparatus is a network device.
[0127] In some example embodiments, a second apparatus capable of performing any of the method 800 (for example, the second apparatus 120 in FIG. 1) may comprise means for performing the respective operations of the method 800. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The second apparatus may be implemented as or included in the second apparatus 120 in FIG. 1.
[0128] In some example embodiments, the second apparatus comprises means for transmitting, to a first apparatus, a restriction configuration for logical channel prioritization that comprises a remaining time threshold for a logical channel; and means for transmitting, to the first apparatus, an indication for enabling the restriction configuration for logical channel prioritization.
[0129] In some example embodiments, remaining time for to-be-transmitted data on the logical channel is related to a packet data convergence protocol, PDCP, discard timer corresponding to a service data unit, SDU, associated with the to-be-transmitted data on the logical channel.
[0130] In some example embodiments, the restriction configuration indicates that resources are allocated to the logical channel in the first step of the resource allocation procedure, in response to that remaining time for the to-be-transmitted data is below or equal to the remaining time threshold.
[0131] In some example embodiments, the restriction configuration indicates that resources are not allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time for the to-be-transmitted data is above the remaining time threshold.
[0132] In some example embodiments, the restriction configuration indicates that resources are allocated to the logical channel in the second step of the resource allocation procedure, in response to that there is one or more available resources after resource allocation to other logical channels with higher priority than the logical channel is completed.
[0133] In some example embodiments, a value of the remaining time threshold is same as that used for triggering a delay status report.
[0134] In some example embodiments, the restriction configuration for logical channel prioritization is configured per logical channel.
[0135] In some example embodiments, the restriction configuration for logical channel prioritization is transmitted via radio resource control signaling.
[0136] In some example embodiments, the second first apparatus comprises means for transmitting, to the first apparatus, information indicating an updated parameter in the restriction configuration, wherein the information is in one of: a radio resource control configuration, a medium access control control element (MAC CE) , or downlink control information.
[0137] In some example embodiments, the first apparatus is a terminal device, and the second apparatus is a network device.
[0138] FIG. 9 is a simplified block diagram of a device 900 that is suitable for implementing example embodiments of the present disclosure. The device 900 may be provided to implement a communication device, for example, the first apparatus 110 or the second apparatus 120 as shown in FIG. 1. As shown, the device 900 includes one or more processors 910, one or more memories 920 coupled to the processor 910, and one or more communication modules 940 coupled to the processor 910.
[0139] The communication module 940 is for bidirectional communications. The communication module 940 has one or more communication interfaces to facilitate communication with one or more other modules or devices. The communication interfaces may represent any interface that is necessary for communication with other network elements. In some example embodiments, the communication module 940 may include at least one antenna.
[0140] The processor 910 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 900 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.
[0141] The memory 920 may include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 924, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , an optical disk, a laser disk, and other magnetic storage and / or optical storage. Examples of the volatile memories include, but are not limited to, a random-access memory (RAM) 922 and other volatile memories that will not last in the power-down duration.
[0142] A computer program 930 includes computer executable instructions that are executed by the associated processor 910. The instructions of the program 930 may include instructions for performing operations / acts of some example embodiments of the present disclosure. The program 930 may be stored in the memory, e.g., the ROM 924. The processor 910 may perform any suitable actions and processing by loading the program 930 into the RAM 922.
[0143] The example embodiments of the present disclosure may be implemented by means of the program 930 so that the device 900 may perform any process of the disclosure as discussed with reference to FIG. 2 to FIG. 8. The example embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
[0144] In some example embodiments, the program 930 may be tangibly contained in a computer readable medium which may be included in the device 900 (such as in the memory 920) or other storage devices that are accessible by the device 900. The device 900 may load the program 930 from the computer readable medium to the RAM 922 for execution. In some example embodiments, the computer readable medium may include any types of non-transitory storage medium, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like. The term “non-transitory, ” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) .
[0145] FIG. 10 shows an example of the computer readable medium 1000 which may be in form of CD, DVD or other optical storage disk. The computer readable medium 1000 has the program 930 stored thereon.
[0146] Generally, 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, and other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. Although 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.
[0147] Some example embodiments of the present disclosure also provide at least one computer program product tangibly stored on a computer readable medium, such as a non-transitory computer readable medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target physical or virtual processor, to carry out any of the methods as described above. Generally, 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.
[0148] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. The program code 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 code, 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.
[0149] In the context of the present disclosure, the computer program code 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 medium, and the like.
[0150] 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.
[0151] Further, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, although several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Unless explicitly stated, certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, unless explicitly stated, various features that are described in the context of a single embodiment may also be implemented in a plurality of embodiments separately or in any suitable sub-combination.
[0152] Although the present disclosure has been described in languages specific to structural features and / or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific feature s or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims
1.A first apparatus comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus to:receive, from a second apparatus, an indication for enabling a restriction configuration for logical channel prioritization that comprises a remaining time threshold;compare a remaining time that is used for determining data discarding of to-be-transmitted data on a logical channel with the remaining time threshold in the restriction configuration; andbased on a determination that the remaining time is below or equal to the remaining time threshold, perform a resource allocation to the logical channel at least in a first step of a resource allocation procedure; orbased at least on a determination that the remaining time is above the remaining time threshold, perform the resource allocation to the logical channel in a second step of the resource allocation procedure.2.The first apparatus of claim 1, wherein the remaining time is related to a packet data convergence protocol, PDCP, discard timer corresponding to a service data unit, SDU, associated with the to-be-transmitted data on the logical channel.3.The first apparatus of claim 1, wherein the restriction configuration indicates that resources are allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time is below or equal to the remaining time threshold.4.The first apparatus of claim 1, wherein the restriction configuration indicates that resources are not allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time is above the remaining time threshold.5.The first apparatus of claim 3 or 4, wherein the restriction configuration indicates that resources are allocated to the logical channel in the second step of the resource allocation procedure, in response to that there is one or more available resources after resource allocation to other logical channels with higher priority than the logical channel is completed.6.The first apparatus of any of claims 1-5, wherein a value of the remaining time threshold is same as that used for triggering a delay status report.7.The first apparatus of any of claims 1-6, wherein the restriction configuration for logical channel prioritization is configured per logical channel.8.The first apparatus of any of claims 1-7, wherein the first apparatus is caused to:receive, from the second apparatus, the restriction configuration for logical channel prioritization via radio resource control signaling.9.The first apparatus of any of claims 1-8, wherein the first apparatus is caused to:receive, from a second apparatus, information regarding an updated remaining time threshold, wherein the information is in one of: a radio resource control configuration, a medium access control (MAC) control element (CE) , or downlink control information.10.The first apparatus of any of claims 1-9, wherein the first apparatus is a terminal device, and the second apparatus is a network device.11.A second apparatus comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the second apparatus to:transmit, to a first apparatus, a restriction configuration for logical channel prioritization that comprises a remaining time threshold for a logical channel; andtransmit, to the first apparatus, an indication for enabling the restriction configuration for logical channel prioritization.12.The second apparatus of claim 11, wherein remaining time for to-be-transmitted data on the logical channel is related to a packet data convergence protocol, PDCP, discard timer corresponding to a service data unit, SDU, associated with the to-be-transmitted data on the logical channel.13.The second apparatus of claim 11, wherein the restriction configuration indicates that resources are allocated to the logical channel in the f`st step of the resource allocation procedure, in response to that remaining time for the to-be-transmitted data is below or equal to the remaining time threshold.14.The second apparatus of claim 11, wherein the restriction configuration indicates that resources are not allocated to the logical channel in the first step of the resource allocation procedure, in response to that the remaining time for the to-be-transmitted data is above the remaining time threshold.15.The second apparatus of claim 13 or 14, wherein the restriction configuration indicates that resources are allocated to the logical channel in the second step of the resource allocation procedure, in response to that there is one or more available resources after resource allocation to other logical channels with higher priority than the logical channel is completed.16.The second apparatus of any of claims 11-15, wherein a value of the remaining time threshold is same as that used for triggering a delay status report.17.The second apparatus of any of claims 11-16, wherein the restriction configuration for logical channel prioritization is configured per logical channel.18.The second apparatus of any of claims 11-17, wherein the restriction configuration for logical channel prioritization is transmitted via radio resource control signaling.19.The second apparatus of any of claims 11-18, wherein the second first apparatus is caused to:transmit, to the first apparatus, information indicating an updated parameter in the restriction configuration, wherein the information is in one of: a radio resource control configuration, a medium access control (MAC) control element (CE) , or downlink control information.20.The second apparatus of any of claims 11-19, wherein the first apparatus is a terminal device, and the second apparatus is a network device.21.A method comprising:receiving, at a first apparatus and from a second apparatus, an indication for enabling a restriction configuration for logical channel prioritization that comprises a remaining time threshold.comparing a remaining time that is used for determining data discarding of to-be-transmitted data on a logical channel with the remaining time threshold in the restriction configuration. andbased on a determination that the remaining time is below or equal to the remaining time threshold, performing a resource allocation to the logical channel at least in a first step of a resource allocation procedure. orbased at least on a determination that the remaining time is above the remaining time threshold, perform the resource allocation to the logical channel in a second step of the resource allocation procedure.22.A method comprising:transmitting, to a first apparatus, a restriction configuration for logical channel prioritization that comprises a remaining time threshold for a logical channel.transmitting, to the first apparatus, an indication for enabling the restriction configuration for logical channel prioritization.23.A first apparatus comprising:means for receiving, from a second apparatus, an indication for enabling a restriction configuration for logical channel prioritization that comprises a remaining time threshold;means for comparing a remaining time that is used for determining data discarding of to-be-transmitted data on a logical channel with the remaining time threshold in the restriction configuration; andmeans for based on a determination that the remaining time is below or equal to the remaining time threshold, performing a resource allocation to the logical channel at least in a first step of a resource allocation procedure; ormeans for based at least on a determination that the remaining time is above the remaining time threshold, performing the resource allocation to the logical channel in a second step of the resource allocation procedure.24.A second apparatus comprising:means for transmitting, to a first apparatus, a restriction configuration for logical channel prioritization that comprises a remaining time threshold for a logical channel; andmeans for transmitting, to the first apparatus, an indication for enabling the restriction configuration for logical channel prioritization.25.A computer readable medium comprising instructions stored thereon for causing an apparatus at least to perform the method of claim 21 or the method of claim 22.
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