A discontinuous reception configuration
By configuring DRX cycles with rational numbers ensuring long cycles are multiples of short cycles and using a modified MAC formula, the challenges of DRX cycle alignment for XR frame rates are addressed, achieving synchronized and error-free DRX operation.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ALCATEL LUCENT SHANGHAI BELL CO LTD
- Filing Date
- 2023-09-28
- Publication Date
- 2026-05-15
AI Technical Summary
Existing DRX configurations struggle to accommodate non-integer periodicities required by extended reality (XR) frame rates, leading to issues with DRX cycle alignment and overlapping short cycles when long cycles are rational numbers, which are not addressed in prior art.
Implementing DRX cycles as rational numbers with a constraint that long cycles are multiples of short cycles, using a modified MAC formula to synchronize and avoid overlaps, and introducing new parameters for hyper cycles and cycle counts to ensure proper synchronization.
Ensures synchronized and efficient DRX operation for XR traffic by preventing short cycle overlaps and maintaining consistent DRX cycle durations, aligning with XR frame rates without numerical errors.
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Figure CN2023122975_15052026_PF_FP_ABST
Abstract
Description
A DISCONTINUOUS RECEPTION CONFIGURATION
[0001] FIELDS
[0002] 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 a Discontinuous Reception (DRX) configuration.BACKGROUND
[0003] The enhancements related to power saving are specified. DRX is a wireless communication technology used to save device power by allowing devices to enter a low-power mode for a certain period of time, thereby reducing energy consumption.
[0004] Configuring DRX cycles as rational numbers has been agreed to support extended reality (XR) frame rates corresponding to non-integer periodicities. To achieve this objective, modifications to the medium access control (MAC) DRX formula are necessary to ensure that devices enter and exit the low-power mode at appropriate intervals to accommodate the requirements of non-integer periodicities.SUMMARY
[0005] 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 at least to: receive, from a second apparatus, a DRX configuration, at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter, wherein the DRX configuration satisfies a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and apply a DRX short cycle with a rational number at least based on the DRX configuration.
[0006] 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 at least to: determine a DRX configuration at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter based on a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and provide the DRX configuration to the first apparatus.
[0007] In a third aspect of the present disclosure, there is provided a method. The method comprises: receiving, from a second apparatus, a DRX configuration, at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter, wherein the DRX configuration satisfies a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and applying a DRX short cycle with a rational number at least based on the DRX configuration.
[0008] In a fourth aspect of the present disclosure, there is provided a method. The method comprises: determining a DRX configuration at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter based on a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and providing the DRX configuration to the first apparatus.
[0009] 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, a DRX configuration, at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter, wherein the DRX configuration satisfies a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and means for applying a DRX short cycle with a rational number at least based on the DRX configuration.
[0010] In a sixth aspect of the present disclosure, there is provided a second apparatus. The second apparatus comprises means for determining a DRX configuration at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter based on a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and means for providing the DRX configuration to the first apparatus.
[0011] 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 carry out at least the method according to the third aspect.
[0012] 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 carry out at least the method according to the fourth aspect.
[0013] 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
[0014] Some example embodiments will now be described with reference to the accompanying drawings, where:
[0015] FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure can be carried out;
[0016] FIG. 2 illustrates an example of potential issues for calculating the start offset for DRX short cycles;
[0017] FIG. 3 illustrates a signaling chart of communication according to some example embodiments of the present disclosure;
[0018] FIG. 4 illustrates a flowchart of an example process for determining a start of short DRX cycle according to some example embodiments of the present disclosure;
[0019] FIG. 5 illustrates a flowchart of a method carried out at a first apparatus according to some example embodiments of the present disclosure;
[0020] FIG. 6 illustrates a flowchart of a method carried out at a second apparatus according to some example embodiments of the present disclosure;
[0021] FIG. 7 illustrates a simplified block diagram of a device that is suitable for carrying out example embodiments of the present disclosure; and
[0022] FIG. 8 illustrates a block diagram of an example computer readable medium in accordance with some example embodiments of the present disclosure.
[0023] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0024] 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 carried out in various manners other than the ones described below.
[0025] 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.
[0026] 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.
[0027] 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.
[0028] 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.
[0029] As used herein, unless stated explicitly, carrying out a step “in response to A” does not indicate that the step is carried out immediately after “A” occurs and one or more intervening steps may be included.
[0030] 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.
[0031] As used in this application, the term “circuitry” may refer to one or more or all of the following:
[0032] (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and
[0033] (b) combinations of hardware circuits and software, such as (as applicable) :
[0034] (i) a combination of analog and / or digital hardware circuit (s) with software / firmware and
[0035] (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
[0036] (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.
[0037] 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.
[0038] 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 Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be carried out 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) , 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.
[0039] 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.
[0040] 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.
[0041] 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 carrying out 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 resources in other domains.
[0042] FIG. 1 illustrates an example communication environment 100 in which example embodiments of the present disclosure can be carried out. The communication environment 100 comprises a first apparatus 110 and a second apparatus 120, which may communicate with each other.
[0043] In the following, for the purpose of illustration, some example embodiments are described with the first apparatus 110 operating as a terminal device (e.g., a UE) and the second apparatus 120 operating as a radio access network device (e.g., a gNB) . However, in some example embodiments, operations described in connection with a terminal device may be carried out at a radio access network device or other device, and operations described in connection with a radio access network device may be carried out at a terminal device or other device.
[0044] It is to be understood that the number of radio access network devices and terminal devices shown in FIG. 1 is given for the purpose of illustration without suggesting any limitations. The communication network 100 may include any suitable number of radio access network devices and terminal devices.
[0045] In some example embodiments, if the first apparatus 110 is a terminal device and the second apparatus 120 is a radio access network device, a link from the second apparatus 120 to the first apparatus 110 is referred to as a downlink (DL) , and 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) .
[0046] Communications in the communication environment 100 may be carried out 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.
[0047] As discussed above, DRX may support XR frame rates corresponding to non-integer periodicities (through at least semi-static mechanisms e.g., Radio Resource Control (RRC) signalling) . Therefore, some type of DRX RAN2 is to be added to support for XR periods such as 1 / 60s = 16.66... ms, and 1 / 90s = 11.11…ms.
[0048] DRX cycle alignment issues for XR power saving enhancements had been discussed with the following agreements reached: defining DRX cycle based on rational numbers.
[0049] Furthermore, it is proposed to use the improved modulo operation to avoid numerical issues when DRX cycle is represented by a rational number. Specifically, based on the agreement of defining DRX cycle based on rational numbers, considering that REAL value for ASN. 1 is not used, it could be enough to configure an integer hyper cycle (e.g., 50ms) and number of cycles within the hyper cycle (e.g., 3) . Then with the floor operation as proposed to the Medium Access Control (MAC) formula it would result in the pattern of 17, 17, 16 without introducing a counter to check at which cycle when an adjustment is needed.
[0050] According to the typical frame rate captured in the stage 2 running CR, possible combinations of hyper cycle and number of cycles per hyper cycle (100, 3) , (200, 9) , (50, 3) , (125, 9) , (100, 9) , (25, 3) could cover the frame rate of 30fps, 45fps, 60fps, 72fps, 90fps, 120fps. The hyper cycle and number of cycles could be considered to configure as separate parameters to allow any combination and be future proof. It is left to the network (NW) implementation to configure the combination based on the traffic characteristic.
[0051] One proposal is that hyperCycle and numberOfCycles per hyper cycle is to be configured as separate parameters with possible values of {ms25, ms50, ms100, ms125, ms200, spare3, spare2, spare1} for the hyper cycle and {ms3, ms9, spare2, spare1} for numberOfCycles per hyper cycle. DRX cycle is defined as hyperCycle / numberOfCycles.
[0052] The other proposal is that DRX StartOffset is separately configured from the DRX cycle and only the values from 0 to floor (hyperCycle / numberOfCycles) –1 are applicable depending on the hyperCycle and numberOfCycles configurations.
[0053] Configuring DRX hyper cycle requires enhancements to the DRX-Config IE as shown in Table 1:
[0054] Table 1
[0055] In the case of Long DRX cycle, A = [ (SFN × 10) + subframe number] , B / C =drx-LongCycle, which is a rational number represented by the ratio of two integers (B and C) , and Z = drx-StartOffset are denoted. The DRX formula with rational numbers may adopt the following implementation to avoid the numerical errors due to the numerical precision of fractional numbers by a computer machine.
[0056] In the case of Short DRX cycle, B / C = drx-ShortCycle, which is a rational number represented by the ratio of two integers (B and C) , is denoted. The following formula is obtained based on the same methodology:
[0057] Another proposal is that in addition to the MAC formula change with floor operation, Floor operation of modulo of a rational number is captured, and floor (A modulo (B / C) ) shall be carried out as to avoid rounding error, where B = hyperCycle and C = numberOfCycles in the hyper cycle according to Table 2 below:
[0058] Table 2
[0059] According to DRX short cycle MAC and RRC specifications, the following procedures related to the Short DRX cycle are enabled.
[0060] Table 3
[0061] Furthermore, the following parameters related to Short DRX cycle are configured.
[0062] Table 4
[0063] Table 5
[0064] In summary, based on the above discussion, it has been agreed to configure DRX cycle as rational numbers to support XR frame rates corresponding to non-integer periodicities, which therefore requires the modification of MAC DRX formula. To capture that floor operation of modulo of a rational number, a new formula is introduced to avoid the rounding errors, i.e., floor (A modulo (B / C) ) shall be carried out as However, several open problems have not discussed, especially the interplay between the configuration short cycles and the long cycle when rational number and new formulas are applied.
[0065] Considering the fact that XR traffic is composed of continuous, periodic data bursts, either short DRX cycle or long DRX cycle would work fine. There is no good reason to exclude one of them from using the new DRX cycles, and it will be really up to operators to choose which type of DRX cycle (s) to configure.
[0066] It has been proposed that new DRX cycles in rational numbers are supported for both Short and Long DRX cycles. Specifically, if the Short DRX cycle is configured, the length of the Long DRX cycle shall be an integer multiple of the Short DRX cycle. This requirement should be applicable to the new DRX cycles as well, for the same reasons behind the requirement in legacy.
[0067] Furthermore, it has been proposed that if the Short DRX cycle in rational number is configured, the length of the Long DRX cycle shall be an integer multiple of the Short DRX cycle, as in legacy.
[0068] Although it is agreed to introduce rational number DRX cycles, whether this is needed for short DRX cycles is to be further discussed. In some view, there is no reason to apply rational numbers to short DRX cycles. Currently, there are two mechanisms for the UE to adopt short DRX cycle during the DRX procedure: (a) by reception of short DRX cycle MAC CE; (b) by the expiry of DRX inactivity timer.
[0069] First, considering the frame rate is quite stable, the DRX cycle should also be fixed. Therefore, the NW is not supposed to adjust the DRX cycle via MAC control element (CE) , i.e., switch to the Short DRX cycle.
[0070] One observation is made that there is no need to switch to short DRX cycle via MAC CE for XR.
[0071] Next, as for the short DRX cycle triggered by the expiry of drx-InactivityTimer, the motivation of this mechanism should be analyzed. For Mobile Broadband (MBB) traffic, data may arrive continuously over a period of time. Once there is some data transmitted, it is probable to have more data for transmission in the subsequent period of time. To be able to transmit the subsequent data timely, the UE shall wake up more frequently. This motivates the introduction of short DRX cycle. The DRX cycle is switched to the short one when drx-InactivityTimer expires as drx-InactivityTimer is triggered by data transmission.
[0072] However, the above motivation does not hold for XR traffic. In XR, the data bursts arrive by periodicities and there is one data burst in each periodicity. Once the data burst is captured by drx-onDuration, it will be completely transmitted before the expiry of drx-InactivityTimer. Then, the UE can sleep until the next periodicity without switching to Short DRX cycle.
[0073] Another observation is made that there is no need to switch to short DRX cycle when drx-InactivityTimer expires for XR.
[0074] From the above observations, there is no need to support short DRX cycle for XR. The rational numbers should not be applicable for short DRX cycle. With the new periodicity, there is no need either to introduce Enhanced-Subframe Number (E-SFN) for the formula determining short DRX cycle.
[0075] In this situation, it has been proposed that the Short DRX cycle with rational number for XR traffic is not supported and E-SFN does not need to be introduced for the formula determining the short DRX cycle.
[0076] As another option, it has been proposed that the Short DRX cycle should not be configured when the Long DRX cycle is configured as rational number.
[0077] Moreover, whether enhancing the Short DRX formula is needed will be further discussed, considering that for every Short DRX cycle there must be a Long DRX cycle, which is a multiple of the Short DRX cycle.
[0078] As discussed above, it has been agreed to configure the rational DRX cycle for XR type of service. However, some issues are not addressed in the prior art.
[0079] One problem is, it is clearly summarized in RRC specification that “If drx-ShortCycle is configured, the value of drx-LongCycle shall be a multiple of the drx-ShortCycle value” . Nevertheless, how to configure the drx-ShortCycle to satisfy such condition is never discussed in the prior art when the drx-LongCycle is a rational number.
[0080] Another problem is, if the drx-ShortCycle is still configured with an integer number, the interplay between rational drx-LongCycle and drx-ShortCycle in this case will create some issues, which further results in ambiguities for the UE to start the Short DRX cycle.
[0081] Therefore, it may require the modification of current specifications, especially MAC and RRC.
[0082] To better illustrate the above problem statement, a numerical example is shown in FIG. 2. FIG. 2 illustrates the overlapping Short DRX cycles. Numerical illustrations of potential issues are provided by using the proposed new formula for calculating the StartOffset for DRX short cycles.
[0083] When drx-LongCycle is configured as a rational number, the beginning of the Long DRX cycle slides over time to account fora decimal part that accumulates over time. The sliding / drifting of the beginning of the Long DRX cycle is due to the variation of the duration of the Long DRX cycle, which is not anymore constant over time. For example, if the rational number representing the drx-LongCycle is 50 / 3, it means that the duration follows the pattern {17, 17, 16} ms. Equivalently, it can be seen that the fourth cycle will start 1ms earlier, since the duration of the third cycle in the pattern is 1ms shorter. Additionally, the variable duration of the Long DRX cycle makes impossible to fulfil the criteria that the drx-LongCycle shall be a multiple of the drx-ShortCycle for all durations of the pattern generated by the rational. For example, in the pattern of durations {17, 17, 16} ms generated by the drx-LongCycle configured with rational number equal to 50 / 3, 16 and 17 are co-primes, i.e., they have only one as common factor. As illustrated in FIG. 2, if drx-ShortCycle is set to 4 when drx-LongCycle is set to 50 / 3, there exist Long DRX cycles that contain short DRX cycles with fractional duration. This results in consecutive short DRX cycles that overlap in time, i.e., a Short DRX cycle starts before the end of the previous one.
[0084] According to some example embodiments of the present disclosure, there is provided a solution for an interplay between DRX short cycle and the rational long cycle. In this solution, the first apparatus 110 receives, from a second apparatus, a DRX configuration, at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter. The DRX configuration satisfies a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value. The first apparatus 110 applies a DRX short cycle with a rational number at least based on the DRX configuration.
[0085] Example embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.
[0086] Reference is made to FIG. 3, which illustrates a signaling flow 300 of communication in accordance with some embodiments of the present disclosure. For the purposes of discussion, the signaling flow 300 will be discussed with reference to FIG. 1, for example, by using the first apparatus 110 and the second apparatus 120.
[0087] It is to be understood that the operations at the first apparatus 110 and the second apparatus 120 should be coordinated. In other words, the second apparatus 120 and the first apparatus 110 should have common understanding about configurations, parameters and so on. Such common understanding may be carried out by any suitable interactions between the second apparatus 120 and the first apparatus 110 or both the second apparatus 120 and the first apparatus 110 applying the same rule / policy.
[0088] In the following, although some operations are described from a perspective of the first apparatus 110, it is to be understood that the corresponding operations should be carried out by the second apparatus 120. Similarly, although some operations are described from a perspective of the second apparatus 120, it is to be understood that the corresponding operations should be carried out by the first apparatus 110. Merely for brevity, some of the same or similar contents are omitted here.
[0089] As shown in FIG. 3, the second apparatus 120 configure (310) a DRX configuration at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter. The DRX configuration may be configured based on a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value. That is, when the Long DRX cycle is defined as hyperCycle / numberOfCycles, i.e., when drx-CycleRational is configured, the duration of the Short DRX cycle drx-ShortCycle may be configured to guarantee the value of drx-LongCycle is still a multiple of the drx-ShortCycle value. Hereinafter, the information element (IE) “hyperCycle” used hereinafter may also be referred to as a long hyper cycle and the IE “numberOfCycles” used hereinafter may be referred to as the number of DRX long cycles. The IE “drx-LongCycle” used hereinafter may be referred to as a DRX long cycle and the IE “drx-ShortCycle” used hereinafter may be referred to as a DRX short cycle.
[0090] For example, the DRX long cycle related configuration may comprises at least one of a long hyper cycle or the number of the DRX long cycles.
[0091] Furthermore, at least one new IE may be introduced for the DRX short cycle related configuration. For example, the at least one DRX short cycle related parameter comprises at least one of the number of the DRX short cycles (i.e., numberOfShortCycles) or the a short hyper cycle.
[0092] To configure the rational short DRX cycle, the following shorthand for better representation is defined:
[0093] ● B / C=drxLongCycle: a rational number represented by the ratio of two integers (B and C) ;
[0094] ● Bs / Cs=drxShortCycle: a rational number represented by the ratio of two integers (Bs and Cs) .
[0095] where B represents a long hyper cycle, Bs represents a short hyper cycle, C represents the number of the DRX long cycles and Cs represents the number of the DRX short cycles.
[0096] Furthermore, the following different options may be considered for configuring a rational DRX short cycle such that the constraint “If drx-ShortCycle is configured, the value of drx-LongCycle shall be a multiple of the drx-ShortCycle value” can be fulfilled.
[0097] There are different options for configuring the DRX long cycle related configuration and / or the DRX short cycle related configuration.
[0098] As an option, common hyper cycle (B) for both Long and Short DRX cycle, then there are separate parameters for number of long cycles (C) and short cycles (Cs) within the hyper cycle, with the restriction of Cs is a multiple of C.
[0099] As another option, common C for both Long and Short DRX cycle, and there are separate parameters B and Bs, with the restriction of B is a multiple of Bs.
[0100] Furthermore, separate long hyper cycle (B) and the number of long cycles (C) within long hyper cycle, and short hyper cycle (Bs) and the number of short cycles (Cs) within the short hyper cycle. In this option, as an example, the configuration of long hyper cycle (B) , short hyper cycle (Bs) , the number of long cycles (C) and the number of short cycles (Cs) may meet the restriction of B is a multiple of Bs, and Csis a multiple of C. As another example, the configuration of the configuration of the long hyper cycle (B) and the short hyper cycle (Bs) may meet the restriction of B is a multiple of Bs
[0101] In some embodiments, the relationship that formalizes the restrictions between parameters of “being multiple” are replaced by the relationship of “being congruent modulo an integer number” . Thus, in an option that separate long hyper cycle (B) and number of long cycles (C) within long hyper cycle, and short hyper cycle (Bs) and number of short cycles within the short hyper cycle (Cs) , as an example, the configuration of long hyper cycle (B) , short hyper cycle (Bs) , the number of long cycles (C) and the number of short cycles (Cs) may meet the restriction of B and Bs being congruent modulo an integer number n, and Cs and C being congruent modulo an integer number m. As another example, the configuration of the configuration of the long hyper cycle (B) and the short hyper cycle (Bs) may meet the restriction of B and Bs being congruent modulo an integer number n.
[0102] Now the reference is back to FIG. 3, the second apparatus 120 may transmit (320) the DRX configuration to the first apparatus 110.
[0103] Based on the DRX configuration, the first apparatus 110 may determine (330) whether the short DRX cycle is to be triggered when the long DRX cycle is configured with a rational number (e.g., when drx-CycleRational is configured) .
[0104] How to implement the configured rational DRX short cycle will be discussed as below.
[0105] For example, the first apparatus 110 may determine a start of the DRX long cycle based on:
[0106] where A represents an integer number associated with a subframe number and a system frame number (SFN) , i.e., [ (SFN×10) +subframe number] , B represents the long hyper cycle, C represents the number of the DRX long cycle, B / C is a rational number and represent the DRX long cycle, and Z represent an integer number associated with a DRX start offset.
[0107] Furthermore, the first apparatus 110 may determine a start of the DRX short cycle based on:
[0108] where A represents an integer number associated with a subframe number and a system frame number (SFN) , i.e., [ (SFN×10) +subframe number] , B represents the long hyper cycle, C represents the number of the DRX long cycle, B / C is a rational number and represents the DRX long cycle, Bs represents a short hyper cycle, Cs represents the number of the DRX short cycle, Bs / Cs is a rational number and represents the DRX short cycle and Z represents an integer number associated with a DRX start offset.
[0109] The following operation is further defined for the purpose of implementation convenience: Δ=|SS-DRX-SL-DRX| (3) σ=sign (SS-DRX-SL-DRX) (4)
[0110] No matter how the rational short DRX cycle is configured, there are two different cases, i.e., a case A and a case B, for implementation and potential modification to MAC specifications.
[0111] For the case A, the following restrictions are defined:
[0112] ● The value of B may be an integer multiple of the value Bs, and
[0113] ● The value of Cs may be an integer multiple of the C value.
[0114] If both restrictions hold, then the new formula may be used to detect the beginning of the Long and Short DRX cycles with the assurance that the Long and Short DRX cycles remain synchronized (i.e., the Long DRX cycles start always with a Short DRX cycle) .
[0115] For example, the configuration are as follows: B / C=50 / 3 (5) Bs / Cs=25 / 6 (6)
[0116] Where B=2Bs, and Cs=2C.
[0117] Note that this is equivalent to the option where the configuration of long hyper cycle (B) , short hyper cycle (Bs) , the number of long cycles (C) and the number of short cycles (Cs) meets the restriction of B is a multiple of Bs, and Cs is a multiple of C, which is the most critical case for configuration. In this case, for the MAC DRX formula, the floor operation for floor (A modulo (B / C) ) for rational DRX short cycle is applied to avoid the numerical issues.
[0118] For the case B, the following restriction is defined:
[0119] ● The value of B may be an integer multiple of the value Bs.
[0120] If only this restriction hold, then the new formula used to detect the beginning of the Long and Short DRX cycles does not assurance that the Long and Short DRX cycles remain synchronized. To guarantee the synchronization of the Long and Short DRX cycle the additional restrictions should be considered:
[0121] ● If only the numerator of the Long DRX cycle (sometime called hyper-cycle) is a multiple of the numerator of the Short DRX cycle, then
[0122] ○ the Short DRX cycles that begins before each Long DRX cycle may be postponed;
[0123] ○ the Short DRX cycle that begins after each Long DRX cycle may be skipped.
[0124] For example, the configuration are as follows: B / C=50 / 3 (7) Bs / Cs=25 / 4 (8)
[0125] Where B=2Bs.
[0126] It is to be understood that this is more general case that all options of the DRX long cycle related configuration and / or the DRX short cycle related configuration are captured. In this case, the following implementation method is applied as a general solution.
[0127] FIG. 4 illustrates a flowchart of an example process for determining a start of short DRX cycle according to some example embodiments of the present disclosure. With reference to FIG. 4, two restrictions can be defined adding new conditions to the detection of the short DRX cycle as follows.
[0128] At block 410, the first apparatus 110 may compute amount and sign of deviation between short and long drx cycles Δ=|SS-DRX-SL-DRX| and σ=sign(SS-DRX-SL-DRX).
[0129] Before and after correction time (at the beginning of Long DRX) -> ok: at block 440, if then at block 460, the first apparatus 110 start Short DRX cycle at SS-DRX.
[0130] At correction time (at the beginning of Long DRX) -> postpone: at block 420, if and σ is negative, then at block 430, the first apparatus 110 may postpone next short DRX cycle and start it at SS-DRX+Δ (or at SL-DRX) .
[0131] After correction time (after the beginning of Long DRX) -> skip: at block 440, if and σ is positive, then at block 450, the first apparatus 110 may skip next short DRX cycle.
[0132] For further validation of the proposed implementation method, the following numerical example may be considered.
[0133] For example, the configuration is as follows: longDRXCycle=B / C=50 / 3 (9) Case A: shortDRXCycle= Bs / Cs=25 / 6 (10) Case B: shortDRXCycle= Bs / Cs=25 / 4 (11)
[0134] Starting subframe of the Long and Short DRX cycles (case A and B) is shown in Table 6. In parentheses, actions according to the flowchart are indicated.
[0135] Table 6
[0136] Based on the solutions of the present disclosure, a mechanism for configuring and enabling the DRX short cycles for XR power saving studies is proposed, which includes several new embodiments under the consideration of interplay between the rational DRX long cycle and the short cycles.
[0137] In this solution, DRX short cycle is configured when DRX long cycle is configured as a rational number, i.e., DRX cycle is defined as hyperCycle / numberOfCycles, such that the constraint “If drx-ShortCycle is configured, the value of drx-LongCycle shall be a multiple of the drx-ShortCycle value” can be fulfilled. This may cause the extension of DRX-Config IE in RRC specification.
[0138] Furthermore, A new condition to trigger the short DRX cycle when DRX long cycle is configured as a rational number. This may cause the modification of DRX formula for the short cycle in MAC specification.
[0139] By using the solution proposed in the present disclosure, an overlapping between a short DRX cycle and a DRX long cycle with a rational number can be avoided.
[0140] FIG. 5 shows a flowchart of an example method 500 a first apparatus (UE, User terminal) may carry out in accordance with examples and embodiments described above by means of FIG. 1-4. For the purpose of discussion, the method 500 will be described from the perspective of the first apparatus 110 in FIG. 1.
[0141] At block 510, the first apparatus 110 receives, from a second apparatus, a DRX configuration, at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter, wherein the DRX configuration satisfies a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and
[0142] At block 520, the first apparatus 110 applies a DRX short cycle with a rational number at least based on the DRX configuration.
[0143] In some example embodiments, the DRX long cycle related configuration comprises at least one of: a long hyper cycle, or the number of the DRX long cycles.
[0144] In some example embodiments, the at least one DRX short cycle related parameter comprises at least one of: the number of the DRX short cycles. or a short hyper cycle.
[0145] In some example embodiments, the number of the DRX long cycles and the number of the DRX short cycles are configured with a common value, and wherein the long hyper cycle is multiple of the short hyper cycle.
[0146] In some example embodiments, the long hyper cycle and the short hyper cycle are configured with a common value, and wherein the number of the DRX short cycles is multiple of the number of the DRX long cycles.
[0147] In some example embodiments, the long hyper cycle is multiple of the short hyper cycle and / or the number of the DRX short cycles is multiple of the number of the DRX long cycles.
[0148] In some example embodiments, the long hyper cycle and the short hyper cycle are configured with a restriction of the long hyper cycle and the short hyper cycle being congruent modulo an integer number and / or the number of the DRX short cycles and the number of the DRX long cycles are configured with a restriction of the number of the DRX short cycles and the number of the DRX long cycles being congruent modulo an integer number.
[0149] In some example embodiments, the method 500 further comprises: determining a start of the DRX long cycle based on: where A represents an integer number associated with a subframe number and a system frame number, B represents the long hyper cycle, C represents the number of the DRX long cycle, B / C is a rational number and represent the DRX long cycle, and Z represent an integer number associated with a DRX start offset.
[0150] In some example embodiments, the method 500 further comprises: determining a start of the DRX short cycle based on: where A represents an integer number associated with a subframe number and a system frame number, B represents the long hyper cycle, C represents the number of the DRX long cycle, B / C is a rational number and represents the DRX long cycle, Bs represents a short hyper cycle, Cs represents the number of the DRX short cycle, Bs / Cs is a rational number and represents the DRX short cycle and Z represents an integer number associated with a DRX start offset.
[0151] In some example embodiments, the method 500 further comprises: in accordance with a determination that the long hyper cycle is an integer multiple of the short hyper cycle and the number of the DRX short cycles is an integer multiple of the number of the DRX long cycles, determining a synchronization of the long DRX cycle and short DRX cycle during the determination of the start of the DRX short cycle and / or the DRX short cycle.
[0152] In some example embodiments, the method 500 further comprises: in accordance with a determination that the long hyper cycle is an integer multiple of the short hyper cycle, and a numerator of the long DRX cycle is a multiple of a numerator of the short DRX cycle, determining that the short DRX cycles that begins before or after each long DRX cycle is to be postponed.
[0153] In some example embodiments, the method 500 further comprises: in accordance with a determination that the DRX configuration indicates the long DRX cycle is configured with the rational number, determining that the DRX short cycle is to be triggered.
[0154] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprise a network device.
[0155] FIG. 6 shows a flowchart of an example method 600 a second apparatus (gNB, network device) may carry out in accordance with examples and embodiments described above by means of FIG. 1-4. For the purpose of discussion, the method 600 will be described from the perspective of the second apparatus 120 in FIG. 1.
[0156] At block 610, the second apparatus 120 determines a DRX configuration at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter based on a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and
[0157] At block 620, the second apparatus 120 provides the DRX configuration to the first apparatus.
[0158] In some example embodiments, the DRX long cycle related configuration comprises at least one of: a long hyper cycle, or the number of the DRX long cycles.
[0159] In some example embodiments, the at least one DRX short cycle related parameter comprises at least one of: the number of the DRX short cycles. or a short hyper cycle.
[0160] In some example embodiments, the number of the DRX long cycles and the number of the DRX short cycles are configured with a common value, and wherein the long hyper cycle is multiple of the short hyper cycle.
[0161] In some example embodiments, the long hyper cycle and the short hyper cycle are configured with a common value, and wherein the number of the DRX short cycles is multiple of the number of the DRX long cycles.
[0162] In some example embodiments, the long hyper cycle is multiple of the short hyper cycle and / or the number of the DRX short cycles is multiple of the number of the DRX long cycles.
[0163] In some example embodiments, the long hyper cycle and the short hyper cycle are configured with a restriction of the long hyper cycle and the short hyper cycle being congruent modulo an integer number and / or the number of the DRX short cycles and the number of the DRX long cycles are configured with a restriction of the number of the DRX short cycles and the number of the DRX long cycles being congruent modulo an integer number.
[0164] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprise a network device.
[0165] In some example embodiments, a first apparatus capable of carrying out any of the method 500 (for example, the first apparatus 110 in FIG. 1) may comprise means for carrying out the respective operations of the method 500. The means may be carried out in any suitable form. For example, the means may be carried out in a circuitry or software module. The first apparatus may be carried out as or included in the first apparatus 110 in FIG. 1.
[0166] In some example embodiments, the first apparatus comprises means for receiving, from a second apparatus, a DRX configuration, at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter, wherein the DRX configuration satisfies a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and means for applying a DRX short cycle with a rational number at least based on the DRX configuration.
[0167] In some example embodiments, the DRX long cycle related configuration comprises at least one of: a long hyper cycle, or the number of the DRX long cycles.
[0168] In some example embodiments, the at least one DRX short cycle related parameter comprises at least one of: the number of the DRX short cycles. or a short hyper cycle.
[0169] In some example embodiments, the number of the DRX long cycles and the number of the DRX short cycles are configured with a common value, and wherein the long hyper cycle is multiple of the short hyper cycle.
[0170] In some example embodiments, the long hyper cycle and the short hyper cycle are configured with a common value, and wherein the number of the DRX short cycles is multiple of the number of the DRX long cycles.
[0171] In some example embodiments, the long hyper cycle is multiple of the short hyper cycle and / or the number of the DRX short cycles is multiple of the number of the DRX long cycles.
[0172] In some example embodiments, the long hyper cycle and the short hyper cycle are configured with a restriction of the long hyper cycle and the short hyper cycle being congruent modulo an integer number and / or the number of the DRX short cycles and the number of the DRX long cycles are configured with a restriction of the number of the DRX short cycles and the number of the DRX long cycles being congruent modulo an integer number.
[0173] In some example embodiments, the first apparatus further comprises means for determining a start of the DRX long cycle based on: SL-DRX= where A represents an integer number associated with a subframe number and a system frame number, B represents the long hyper cycle, C represents the number of the DRX long cycle, B / C is a rational number and represent the DRX long cycle, and Z represent an integer number associated with a DRX start offset.
[0174] In some example embodiments, the first apparatus further comprises means for determining a start of the DRX short cycle based on: where A represents an integer number associated with a subframe number and a system frame number, B represents the long hyper cycle, C represents the number of the DRX long cycle, B / C is a rational number and represents the DRX long cycle, Bs represents a short hyper cycle, Cs represents the number of the DRX short cycle, Bs / Cs is a rational number and represents the DRX short cycle and Z represents an integer number associated with a DRX start offset.
[0175] In some example embodiments, the first apparatus further comprises: means for in accordance with a determination that the long hyper cycle is an integer multiple of the short hyper cycle and the number of the DRX short cycles is an integer multiple of the number of the DRX long cycles, determining a synchronization of the long DRX cycle and short DRX cycle during the determination of the start of the DRX short cycle and / or the DRX short cycle.
[0176] In some example embodiments, the first apparatus further comprises: means for in accordance with a determination that the long hyper cycle is an integer multiple of the short hyper cycle, and a numerator of the long DRX cycle is a multiple of a numerator of the short DRX cycle, determining that the short DRX cycles that begins before or after each long DRX cycle is to be postponed.
[0177] In some example embodiments, the first apparatus further comprises: means for in accordance with a determination that the DRX configuration indicates the long DRX cycle is configured with the rational number, determining that the DRX short cycle is to be triggered.
[0178] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprise a network device.
[0179] In some example embodiments, the first apparatus further comprises means for carrying out other operations in some example embodiments of the method 500 or the first apparatus 110. In some example embodiments, the means comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the first apparatus.
[0180] In some example embodiments, a second apparatus capable of carrying out any of the method 600 (for example, the second apparatus 120 in FIG. 1) may comprise means for carrying out the respective operations of the method 600. The means may be carried out in any suitable form. For example, the means may be carried out in a circuitry or software module. The second apparatus may be carried out as or included in the second apparatus 120 in FIG. 1.
[0181] In some example embodiments, the second apparatus comprises means for determining a DRX configuration at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter based on a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; and means for providing the DRX configuration to the first apparatus.
[0182] In some example embodiments, the DRX long cycle related configuration comprises at least one of: a long hyper cycle, or the number of the DRX long cycles.
[0183] In some example embodiments, the at least one DRX short cycle related parameter comprises at least one of: the number of the DRX short cycles. or a short hyper cycle.
[0184] In some example embodiments, the number of the DRX long cycles and the number of the DRX short cycles are configured with a common value, and wherein the long hyper cycle is multiple of the short hyper cycle.
[0185] In some example embodiments, the long hyper cycle and the short hyper cycle are configured with a common value, and wherein the number of the DRX short cycles is multiple of the number of the DRX long cycles.
[0186] In some example embodiments, the long hyper cycle is multiple of the short hyper cycle and / or the number of the DRX short cycles is multiple of the number of the DRX long cycles.
[0187] In some example embodiments, the long hyper cycle and the short hyper cycle are configured with a restriction of the long hyper cycle and the short hyper cycle being congruent modulo an integer number and / or the number of the DRX short cycles and the number of the DRX long cycles are configured with a restriction of the number of the DRX short cycles and the number of the DRX long cycles being congruent modulo an integer number.
[0188] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprise a network device.
[0189] In some example embodiments, the second apparatus further comprises means for carrying out other operations in some example embodiments of the method 600 or the second apparatus 120. In some example embodiments, the means comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the second apparatus.
[0190] FIG. 7 is a simplified block diagram of a device 700 that is suitable for for carrying out examples and embodiments described above by means of FIG. 1-4. The device 700 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 700 includes one or more processors 710, one or more memories 720 coupled to the processor 710, and one or more communication modules 740 coupled to the processor 710.
[0191] The communication module 740 is for bidirectional communications. The communication module 740 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 740 may include at least one antenna.
[0192] The processor 710 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 700 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.
[0193] The memory 720 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) 724, 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) 722 and other volatile memories that will not last in the power-down duration.
[0194] A computer program 730 includes computer executable instructions that are executed by the associated processor 710. The instructions of the program 730 may include instructions for carrying out operations / acts of some example embodiments of the present disclosure. The program 730 may be stored in the memory, e.g., the ROM 724. The processor 710 may carry out any suitable actions and processing by loading the program 730 into the RAM 722.
[0195] The example embodiments of the present disclosure may be carried out by means of the program 730 so that the device 700 may carry out any process of the disclosure as discussed with reference to FIG. 2 to FIG. 6. The example embodiments of the present disclosure may also be carried out by hardware or by a combination of software and hardware.
[0196] In some example embodiments, the program 730 may be tangibly contained in a computer readable medium which may be included in the device 700 (such as in the memory 720) or other storage devices that are accessible by the device 700. The device 700 may load the program 730 from the computer readable medium to the RAM 722 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) .
[0197] FIG. 8 shows an example of the computer readable medium 800 which may be in form of CD, DVD or other optical storage disk. The computer readable medium 800 has the program 730 stored thereon.
[0198] Generally, various embodiments of the present disclosure may be carried out in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be carried out in hardware, and other aspects may be carried out 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 carried out 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.
[0199] 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 carry out particular tasks or carry out 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.
[0200] 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 carried out. 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.
[0201] 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 carry out various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.
[0202] 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.
[0203] Further, although operations are depicted in a particular order, this should not be understood as requiring that such operations be carried out in the particular order shown or in sequential order, or that all illustrated operations be carried out, 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 carried out 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 carried out in a plurality of embodiments separately or in any suitable sub-combination.
[0204] 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 features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of carrying out 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 at least to:receive, from a second apparatus, a discontinuous reception, DRX, configuration, at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter, wherein the DRX configuration satisfies a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; andapply a DRX short cycle with a rational number at least based on the DRX configuration.2.The first apparatus of claim 1, wherein the DRX long cycle related configuration comprises at least one of:a long hyper cycle, orthe number of the DRX long cycle.3.The first apparatus of claim 2, wherein the at least one DRX short cycle related parameter comprises at least one of:the number of the DRX short cycle. ora short hyper cycle.4.The first apparatus of claim 3, wherein the number of the DRX long cycle and the number of the DRX short cycle are configured with a common value, and wherein the long hyper cycle is multiple of the short hyper cycle.5.The first apparatus of claim 3, wherein the long hyper cycle and the short hyper cycle are configured with a common value, and wherein the number of the DRX short cycle is multiple of the number of the DRX long cycle.6.The first apparatus of claim 3, wherein the long hyper cycle is multiple of the short hyper cycle and / or the number of the DRX short cycle is multiple of the number of the DRX long cycle.7.The first apparatus of claim 3, wherein the long hyper cycle and the short hyper cycle are configured with a restriction of the long hyper cycle and the short hyper cycle being congruent modulo an integer number and / or the number of the DRX short cycle and the number of the DRX long cycle are configured with a restriction of the number of the DRX short cycle and the number of the DRX long cycle being congruent modulo an integer number.8.The first apparatus of any of claims 2-7, wherein the first apparatus is cause to:determine a start of the DRX long cycle based on:where A represents an integer number associated with a subframe number and a system frame number, B represents the long hyper cycle, C represents the number of the DRX long cycle, B / C is a rational number and represent the DRX long cycle, and Z represent an integer number associated with a DRX start offset.9.The first apparatus of any of claims 3-8, wherein the first apparatus is cause to:determine a start of the DRX short cycle based on:where A represents an integer number associated with a subframe number and a system frame number, B represents the long hyper cycle, C represents the number of the DRX long cycle, B / C is a rational number and represents the DRX long cycle, Bs represents a short hyper cycle, Cs represents the number of the DRX short cycle, Bs / Cs is a rational number and represents the DRX short cycle and Z represents an integer number associated with a DRX start offset.10.The first apparatus of claim 8 or 9, wherein the first apparatus is caused to:in accordance with a determination that the long hyper cycle is an integer multiple of the short hyper cycle and the number of the DRX short cycle is an integer multiple of the number of the DRX long cycle, determine a synchronization of the long DRX cycle and short DRX cycle during the determination of the start of the DRX short cycle and / or the DRX short cycle.11.The first apparatus of claim 8 or 9, wherein the first apparatus is caused to:in accordance with a determination that the long hyper cycle is an integer multiple of the short hyper cycle, and a numerator of the long DRX cycle is a multiple of a numerator of the short DRX cycle, determine that the short DRX cycles that begins before or after each long DRX cycle is to be postponed.12.The first apparatus of any of claims 1-11, wherein the first apparatus is caused to:in accordance with a determination that the DRX configuration indicates the long DRX cycle is configured with the rational number, determine that the DRX short cycle is to be triggered.13.The first apparatus of any of claims 1-12, wherein the first apparatus comprises a terminal device and the second apparatus comprise a network device.14.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 at least to:determine a discontinuous reception, DRX, configuration at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter based on a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; andprovide the DRX configuration to the first apparatus.15.The second apparatus of claim 14, wherein the DRX long cycle related configuration comprises at least one of:a long hyper cycle, orthe number of the DRX long cycle.16.The second apparatus of claim 15, wherein the at least one DRX short cycle related parameter comprises at least one of:the number of the DRX short cycle. ora short hyper cycle.17.The second apparatus of claim 16, wherein the number of the DRX long cycle and the number of the DRX short cycle are configured with a common value, and wherein the long hyper cycle is multiple of the short hyper cycle.18.The second apparatus of claim 16, wherein the long hyper cycle and the short hyper cycle are configured with a common value, and wherein the number of the DRX short cycle is multiple of the number of the DRX long cycle.19.The second apparatus of claim 16, wherein the long hyper cycle is multiple of the short hyper cycle and / or the number of the DRX short cycle is multiple of the number of the DRX long cycle.20.The second apparatus of claim 16, wherein the long hyper cycle and the short hyper cycle are configured with a restriction of the long hyper cycle and the short hyper cycle being congruent modulo an integer number and / or the number of the DRX short cycle and the number of the DRX long cycle are configured with a restriction of the number of the DRX short cycle and the number of the DRX long cycle being congruent modulo an integer number.21.The first apparatus of any of claims 14-20, wherein the first apparatus comprises a terminal device and the second apparatus comprise a network device.22.A method comprising:receiving, from a second apparatus, a discontinuous reception, DRX, configuration, at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter, wherein the DRX configuration satisfies a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; andapplying a DRX short cycle with a rational number at least based on the DRX configuration.23.A method comprising:determining a discontinuous reception, DRX, configuration at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter based on a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; andproviding the DRX configuration to the first apparatus.24.A first apparatus comprising:means for receiving, from a second apparatus, a discontinuous reception, DRX, configuration, at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter, wherein the DRX configuration satisfies a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; andmeans for applying a DRX short cycle with a rational number at least based on the DRX configuration.25.A second apparatus comprising:means for determining a discontinuous reception, DRX, configuration at least indicating a DRX long cycle related configuration and at least one DRX short cycle related parameter based on a constraint that a value of a DRX long cycle with a rational number is a multiple of a DRX short cycle value; andmeans for providing the DRX configuration to the first apparatus.26.A computer readable medium comprising instructions stored thereon for causing an apparatus at least to carry out the method of claim 22 or the method of claim 23.