Measurement delay optimization
By optimizing carrier selection based on interruption criteria, the solution addresses measurement delay and interruption issues in wireless networks, achieving reduced delays and interruptions through strategic carrier measurement.
Patent Information
- Application Number
- PCT/CN2024/123287
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-10-07
- Publication Date
- 2026-04-16
AI Technical Summary
Existing communication technologies face challenges in minimizing measurement delays and interruptions during carrier measurements in wireless networks, particularly in scenarios where UEs perform measurements with and without gaps, leading to longer delays and potential data loss.
A terminal device and network device exchange information to optimize measurement delays by selecting reference carriers based on criteria associated with interruptions, allowing measurements to be performed on carriers that either do not cause interruptions or have the least interruption potential, thereby reducing the number of carriers measured and minimizing measurement delays and interruption ratios.
This approach significantly reduces measurement delays and interruption ratios by strategically selecting carriers for measurement, enhancing system performance and reducing data loss.
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Figure CN2024123287_16042026_PF_FP_ABST
Abstract
Description
MEASUREMENT DELAY OPTIMIZATIONFIELD
[0001] Various example embodiments generally relate to the field of communication, and in particular, to a terminal device, a network device, methods, apparatuses and a computer readable storage medium related to an optimization on measurement delays and interruptions.BACKGROUND
[0002] A communication network can be seen as a facility that enables communications between two or more communication devices, or provides communication devices access to a data network. A mobile or wireless communication network is one example of a communication network.
[0003] Such communication networks operate in according with standards such as those provided by 3GPP (Third Generation Partnership Project) or ETSI (European Telecommunications Standards Institute) . Examples of standards are the so-called 5G (5th Generation) standards provided by 3GPP.SUMMARY
[0004] In general, example embodiments of the present disclosure provide a solution for optimizing measurement delays, for example, optimizing a number of carriers to be measured, a carrier specific scaling factor (CSSF) , or interruptions caused by performing the measurement. By implementing the example embodiments of the present disclosure, the measurement delays and / or interruption ratio caused by performing the measurement can be minimized.
[0005] In a first aspect, there is provided a terminal device. The terminal device comprises at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to: receive, from a network device, an indication indicative of an optimization on measurement delays; obtain at least one reference carrier determined based on a criteria associated with interruptions; and perform at least one measurement on the determined at least one reference carrier.
[0006] In a second aspect, there is provided a network device. The network device comprises at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the network device at least to: transmit, to a terminal device, an indication indicative of an optimization on measurement delays; receive, from the terminal device, an indication of carriers and measurement interruptions during at least one measurement; and obtain, at least one reference carrier determined from the carriers and based on a criteria associated with measurement interruptions.
[0007] In a third aspect, there is provided a method. The method comprises: receiving, at a terminal device from a network device, an indication indicative of an optimization on measurement delays; obtaining, at the terminal device, at least one reference carrier determined based on a criteria associated with interruptions; and performing, at the terminal device, at least one measurement on the determined at least one reference carrier.
[0008] In a fourth aspect, there is provided a method. The method comprises: transmitting, at a network device to a terminal device, an indication indicative of an optimization on measurement delays; receiving, at the network device from the terminal device, an indication of carriers and measurement interruptions during at least one measurement; and obtaining, at the network device, at least one reference carrier determined from the carriers and based on a criteria associated with measurement interruptions.
[0009] In a fifth aspect, there is provided an apparatus. The apparatus comprises: means for receiving, at a terminal device from a network device, an indication indicative of an optimization on measurement delays; means for obtaining, at the terminal device, at least one reference carrier determined based on a criteria associated with interruptions; and means for performing, at the terminal device, at least one measurement on the determined at least one reference carrier.
[0010] In a sixth aspect, there is provided an apparatus. The apparatus comprises: means for transmitting, at a network device to a terminal device, an indication indicative of an optimization on measurement delays; means for receiving, at the network device from the terminal device, an indication of carriers and measurement interruptions during at least one measurement; and means for obtaining, at the network device, at least one reference carrier determined from the carriers and based on a criteria associated with measurement interruptions.
[0011] In a seventh aspect, there is provided a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to the third aspect or the fourth aspect.
[0012] In an eighth aspect, there is provided a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus to perform at least the method according to the third or fourth aspect.
[0013] In a ninth aspect, there is provided a terminal device. The terminal device comprises receiving circuitry configured to receive, from a network device, an indication indicative of an optimization on measurement delays; obtaining circuitry configured to obtain at least one reference carrier determined based on a criteria associated with interruptions; and performing circuitry configured to perform at least one measurement on the determined at least one reference carrier.
[0014] In a tenth aspect, there is provided a network device. The network device comprises transmitting circuitry configured to transmit, to a terminal device, an indication indicative of an optimization on measurement delays; receiving circuitry configured to receive, from the terminal device, an indication of carriers and measurement interruptions during at least one measurement; and obtaining circuitry configured to obtain, at least one reference carrier determined from the carriers and based on a criteria associated with measurement interruptions.
[0015] 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
[0016] Some example embodiments will now be described with reference to the accompanying drawings, in which:
[0017] FIG. 1A illustrates example network environment in which example embodiments of the present disclosure may be implemented;
[0018] FIG. 1B illustrates an example signaling introduced by RAN2 for indication of need for interruption;
[0019] FIG. 1C illustrates an example of synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) measurement timing configuration (SMTC) ’s scheduled every 20ms;
[0020] FIG. 2 illustrates an example signaling process of optimizing measurement delays in accordance with some example embodiments of the present disclosure;
[0021] FIG. 3 illustrates an example of user equipment (UE) capability for 2 serving cells and 6 inter-frequency carriers within two frequency groups in accordance with some example embodiments of the present disclosure;
[0022] FIGS. 4A and 4B illustrate a comparison of measurements with interruptions and CSSF interruption enhancement where interruptions are avoided in accordance with some example embodiments of the present disclosure;
[0023] FIG. 5 illustrates an example signaling diagram of optimizing measurement delays in accordance with some example embodiments of the present disclosure;
[0024] FIG. 6 illustrates an example flowchart of a method for optimizing measurement delays implemented at a terminal device in accordance with some example embodiments of the present disclosure;
[0025] FIG. 7 illustrates an example flowchart of a method for optimizing measurement delays implemented at a network device in accordance with some example embodiments of the present disclosure;
[0026] FIG. 8 illustrates an example simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure; and
[0027] FIG. 9 illustrates an example block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
[0028] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0029] Principles 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 to help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein may be implemented in various manners other than the ones described below.
[0030] 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 the present disclosure belongs.
[0031] 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.
[0032] It may be understood that although the terms “first” and “second” etc. 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. 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.
[0033] 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. 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.
[0034] As used in this application, the term “circuitry” may refer to one or more or all of the following:
[0035] (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and
[0036] (b) combinations of hardware circuits and software, such as (as applicable) :
[0037] (i) a combination of analog and / or digital hardware circuit (s) with software / firmware and
[0038] (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
[0039] (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.
[0040] 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.
[0041] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as 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 performed according to any suitable generation communication protocols, including, but not limited to, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, the 6G communication protocols and / or beyond. 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.
[0042] 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) , a NR NB (also referred to as a gNB) , a remote radio unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
[0043] 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 (loT) 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, a relay node, an integrated access and backhaul (IAB) node, and / or industrial wireless networks, and the like. In the following description, the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
[0044] As used herein, the term “resource” , “transmission resource” , “resource block” , “physical resource block” (PRB) , “uplink (UL) resource” or “downlink (DL) 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, a resource in a combination of more than one domain or any other resource enabling a communication, and the like. In the following, a resource in time domain (such as, a subframe) 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.
[0045] RAN4 has defined UE requirements for measurements, including measurements with and without measurement gaps, and for various scenarios such as intra-frequency and inter-frequency (including Inter-RAT) measurements. The requirements also cover scenarios where the UE performs both gap-assisted and non-gap-assisted measurements simultaneously. RAN4 has specified how and when the UE should measure certain carriers within or outside gaps based on its capability and measurement gap configuration. If intra-frequency measurements require gaps or if SMTC for intra-frequency measurements fully overlap with per-UE measurement gaps, rules and configurations are also defined. The network cannot influence whether the UE needs gaps for performing measurements on a certain carrier, as this is based on UE capability.
[0046] In Rel-18, RAN4 is developing a new feature that allows a UE supporting gapless measurements to cause interruptions to perform those measurements. To facilitate this, the needForGaps framework is extended. RAN2 has developed a new signaling design that includes a new IE for the network to configure NeedForInterruptionConfigNR-r18, and the UE responds with NeedForInterruptionInfoNR-r18. The design includes a flag to determine if the UE needs interruptions for gapless measurements, which is associated with an entry in a list from Rel-16. With that information, the network can be aware of which frequency layers require interruption in order to perform measurements without gaps.
[0047] Once the UE shares NeedForGaps information, the network makes assumptions about which frequency layers the UE is measuring with and without gaps. In the RAN4 discussion, there was a concern about reducing interruptions for gapless measurements in Rel-18, so it was agreed that measurements with interruptions would use a minimum measurement cycle of 80ms, even if the network configures the SMTC to 20ms, resulting in longer measurement delays.
[0048] As part of the RRM_ph5 work, there is a discussion on reducing UE measurement need to benefit UE, network, and overall system performance by reducing the carrier-specific scaling factor and UE measurement delay in FR2. Possible solutions include relaxing measurement requirements by allowing UEs to monitor only certain frequencies, but there is no clear method for selecting these frequencies. Additionally, some UEs can perform measurements on non-serving carriers without gaps but may cause random interruptions to do so, leading to potential data loss. Hence, there is a need for minimizing measurement delay and / or interruption ratio.
[0049] Therefore, example embodiments of the present disclosure provide a solution for optimizing measurement delays, such as optimizing a number of carriers to be measured, a CSSF, or interruptions caused by performing the measurement. For example, some embodiments of the present disclosure propose a terminal device which receives, from a network device, an indication indicative of an optimization on measurement delays; obtains at least one reference carrier determined based on a criteria associated with interruptions; and performs at least one measurement on the determined at least one reference carrier. In this way, the measurement delays and / or interruption ratio caused by performing the measurement can be minimized.
[0050] For illustrative purposes, principles and example embodiments of the present disclosure of optimizing measurement delays will be described below with reference to FIG. 1A-FIG. 9. However, it is to be noted that these embodiments are given to enable the skilled in the art to understand inventive concepts of the present disclosure and implement the solution as proposed herein, and not intended to limit scope of the present application in any way.
[0051] Reference is made to FIG. 1A, which illustrates an example of a communication network 100A in which some example embodiments of the present disclosure may be implemented. As illustrated in FIG. 1A, the communication network 100A includes a terminal device (which may also be referred to as user equipment or UE) 102 and a network device (which may also be referred to as a gNB or base station) 104. The terminal device 102 and the network device 104 may communicate with each other. The network device 104 may configure the terminal device 102 to measure carriers on frequency bands.
[0052] Although the terminal device 102 and the network device 104 are shown in FIG. 1A, the numbers of the network devices and the terminal devices are not limited. In other words, there may be one or more network devices and one or more terminal devices in the communication network 100A. It is to be understood that the number of devices and their connection relationships and types shown in FIG. 1A are for illustrative purposes without suggesting any limitation. The communication system 100A may comprise any suitable number of devices adapted for implementing embodiments of the present disclosure.
[0053] Reference is made to FIG. 1B, which illustrates an example signaling 100B introduced by RAN2 for indication of need for interruption. A UE 106 in FIG. 1B may correspond to the terminal device 102 in FIG. 1A, and a network 108 in FIG. 1B may correspond to the network device 104 in FIG. 1A. At 110, the network 108 may signal a radio resource control (RRC) reconfiguration to the UE 106, in which need for gaps and need for interruptions is indicated.
[0054] At 112, the UE 106 may transmit an RRC reconfiguration complete signaling to the network 108. The RRC reconfiguration complete signaling may comprise an information element (IE) NeedForInterruptionInfoNR which indicates whether interruption is needed for the UE 106 to perform SSB based measurements on an NR target band without measurement gap while NR-DC or NE-DC is not configured. Details may be seen in Table 1.
[0055] Table 1
[0056] Reference is made to FIG. 1C, which illustrates an example 100C of SMTC’s scheduled every 20ms. Four SMTCs are configured every 20ms, for example, SMTCs 113 and 114. Each SMTC has the risk of triggering the UE to cause interruptions, for example, illustrated by interruptions 116 and 118. The network may configure the SMTC to 20ms, the UE will take samples at least every 80ms, which will imply in longer measurement delays.
[0057] FIG. 2 illustrates an example signaling process 200 of optimizing measurement delays in accordance with some example embodiments of the present disclosure. FIG. 2 will be described with reference to FIG. 1A. The network device 104 transmits (202) an indication 206 indicative of an optimization on measurement delays to the terminal device 102. The terminal device 102 receives (204) the indication 206 from the network device 104. For example, the indication 206 may indicate that the optimization on measurement delays is enabled.
[0058] In some example embodiments, the optimization on measurement delays may comprise minimizing or reducing a CSSF. In some example embodiments, the optimization on measurement delays may comprise minimizing or reducing interruptions for the terminal device during the at least one measurement. In some example embodiments, the optimization on measurement delays may comprise minimizing or reducing the number of carriers to be measured. In some example embodiments, the optimization on measurement delays may comprise one or more of the above items.
[0059] The terminal device 102 transmits (208) an indication 210 of carriers and measurement interruptions during at least one measurement to the network device 104. For example, the terminal device 102 may indicate to the network device 104 on which carriers, measurement gap and interruption are needed. The network device 104 receives (212) the indication 210 from the terminal device 102.
[0060] The terminal device 102 obtains (214) at least one reference carrier determined based on a criteria associated with interruptions. In some example embodiments, the terminal device 102 may determine the at least one reference carrier based on the criteria associated with the interruptions (also referred to as Option 1) . In some example embodiments, the terminal device 102 may receive, from the network device 104, an indication of the at least one reference carrier to be measured on a frequency group.
[0061] The network device 102 obtains (216) at least one reference carrier determined based on a criteria associated with interruptions. In some example embodiments, the network device 104 may determine the at least one reference carrier based on the criteria associated with the interruptions (also referred to as Option 2) . In some example embodiments, the network device 104 may receive, from the terminal device 102, an indication of the at least one reference carrier to be measured on a frequency group.
[0062] In some example embodiments, the terminal device 102 may determine a reference carrier on a frequency group based on the criteria associated with the interruptions. The criteria associated with the interruptions may comprise first selecting a carrier which, when performing measurements, not causing interruptions from the one or more carriers as the reference carrier. If no such carrier, then the terminal device 102 may select a carrier which, when performing measurements, causing interruptions from the one or more carriers as the reference carrier. This criteria may also apply for the network device 104.
[0063] In some example embodiments, the terminal device 102 may select a carrier from the one or more carriers which do not cause interruption based on determining that one or more carriers on the frequency group do not cause interruptions. In some example embodiments, the terminal device 102 may select a carrier from the one or more carriers based on determining that all of the one or more carriers on the frequency group cause interruptions. In some example embodiments, the terminal device 102 may select a carrier with the least interruption potential from the one or more carriers based on determining that the one or more carriers on the frequency group cause interruptions. These example embodiments may also apply for the network device 104.
[0064] The terminal device 102 performs (218) at least one measurement on the determined at least one reference carrier. For example, the terminal device 102 may start measuring the reference carrier in each frequency group. For another example, the network device 104 may configure the terminal device 102 to measure the selected carrier of the frequency group, and the terminal device 102 may start measuring the reference carrier in each frequency group based on the network indication. By implementing example embodiments of FIG. 2, the measurement delays and / or interruption ratio caused by performing the measurement can be minimized.
[0065] In Table 2 below, there is shown that how the proposed solution may be implemented in the interruption requirements considering the agreed CR R4-2414069 in RAN4#112 text as a baseline. One possible implementation of Option 1 above is included with bold text, where the interruption requirements are updated to include only carriers of a frequency group that can only be measured with interruptions. Updates on CSSF text in 38.133 are also expected due to this feature.
[0066] Table 2
[0067] Reference is made to FIG. 3, which illustrates an example 300 of UE capability for 2 serving cells and 6 inter-frequency carriers within two frequency groups in accordance with some example embodiments of the present disclosure. FIG. 3 shows that a total of 8 frequencies are configured to be measured, which are contained within 2 frequency groups (FG1 and FG 2) . From those, the first 2 frequencies are related to serving cell frequencies (Cell1 and Cell2) , and the rest of the frequencies are measured as non-serving inter-frequency carriers. From those, the UE is capable of performing measurements without gaps on Cell1 (serving cell) and non-serving Inter-frequency f4 can be measured without gaps and without interruptions. All the other configured frequencies to be measured will not need gaps but will cause interruption when performing measurements.
[0068] In some example embodiments, based on the UE capability and signaling exchange with the network, the network may configure (or possibly reconfigure) the UE to perform measurements on Inter-frequency f4. It is to be noted that the UE may already perform measurements on the carrier containing cell1 and cell2 in FG1 as they are serving cell.
[0069] In some example embodiments, based on the UE capability and signaling exchange with the network, the network may configure (or possibly reconfigure) the UE to use Inter-frequency f4 as reference carrier. In addition, the UE could be indicated to use one or more of the serving carriers in FG1 as reference carrier.
[0070] In some example embodiments, based on the UE capability and signaling exchange with the network, the UE may select one or more carriers which can be measured without interruptions and performs measurements on that carrier in FG2. Other carriers in FG2 are not measured. In some example embodiments, the UE selection option may be configured by the network (for example, allowing UE selection or not) . The UE may not be required to measure other carriers than those indicated as reference carriers, and the UE may not measure carriers which are not configured as measurement objects.
[0071] Reference is made to FIG. 4A and FIG 4B. FIGS. 4A and 4B illustrate a comparison of measurements with interruptions and CSSF interruption enhancement where interruptions are avoided in accordance with some example embodiments of the present disclosure. FIG. 4A shows an example 400A of the expected behavior of the UE from FIG. 1B in Rel-18 when performing measurements according to the example in FIG. 3. Reference numeral 418 represents a SMTC. Reference numeral 420 represents a measured SMTC. Reference numeral 422 represents an interruption.
[0072] Since 8 frequencies may need to be measured and the UE may need to share the searcher among those frequencies, for each measurement occasion (for example, SMTCs 402, 404, 406, 408, 410, 412, 414 and 416 herein) , only one frequency can be measured at each measurement occasion, which results in measurement delay being 8 times slower in this example in comparison to measuring a single frequency.
[0073] Additionally, performing measurements on the other 6 out of 8 frequencies may cause interruptions when assuming that cell2 is a deactivated SCell. This may result in a total of 12 interruptions at the end of the measurement cycle of 8 SMTC periods.
[0074] FIG. 4B shows the equivalent example 400B of FIG. 4A of when the proposed solution is employed. From the UE capability shown in FIG. 3, it can be seen that there is at least one frequency to be measured in each frequency (402, 424, 426, 428, 430, 432, 412 and 434) group that can be measured without interruptions. As a result, the network may obtain enough information only from the measurements on the frequency of cell1 and f4. Therefore, if the UE skips the measurements on the frequencies of Cell2, f1, f2, f3, f5, and f6, then two main benefits can be obtained.
[0075] The first one is that the measurement delay can be reduced by 4 times. The second benefit is that it is possible to reduce the number of interruptions, and in this example, it can lead to that no interruption would be experienced. This may lead the system performance enhancement by decreasing the number of interruptions caused by performing the measurement.
[0076] Reference is made to FIG. 5, which illustrates an example signaling diagram 500 of optimizing measurement delays in accordance with some example embodiments of the present disclosure. The signaling diagram 500 shows one example signaling chart illustrating how the proposed method may be implemented using NR as example. A UE 502 in FIG. 5 may correspond to the terminal device 102 in FIG. 1A, and a network 504 in FIG. 5 may correspond to the network device 104 in FIG. 1A.
[0077] At 506, the UE 502 may receive the RRCReconfiguration from the network 504 with an indication of “CSSFinterruptionOptimization” enabled. Carriers may be configured to the UE 502 for measurement. At 508, the UE 502 may indicate to the network 504 on which carriers, measurement gap and interruption are needed. After 508, two options may be employed.
[0078] Block 518 shows Option 1, and it is a UE centric option. At 510, the UE 502 may, based on the “CSSFinterruptionOptimization” being enabled, choose a reference carrier on each frequency band with the priority of: (1) Without measurement gaps and without interruptions; and (2) Without measurement gaps but with interruptions. At 512, the UE 502 may start measuring based on this criteria.
[0079] Block 520 shows Option 2, and it is a network configured option. At 514, the network 504 may, based on UE interruptions for measurement, choose a reference carrier on each frequency group with the priority of (1) Without measurement gaps and without interruptions; and (2) Without measurement gaps but with interruptions. The network 504 may indicate the reference carrier (s) on each frequency group to the UE 502. At 516, the UE 502 may start measuring the reference carrier based on the network indication in each group.
[0080] Reference is made to FIG. 6, which illustrates an example flowchart of a method 600 for optimizing measurement delays implemented at a terminal device in accordance with some example embodiments of the present disclosure. FIG. 6 will be described with reference to FIG. 1A.
[0081] At 602, the terminal device 102 receives, from the network device 104, an indication indicative of an optimization on measurement delays. At 604, the terminal device 102 obtains at least one reference carrier determined based on a criteria associated with interruptions. At 606, the terminal device 102 performs at least one measurement on the determined at least one reference carrier.
[0082] Reference is made to FIG. 7, which illustrates an example flowchart of a method 700 for optimizing measurement delays implemented at a network device in accordance with some example embodiments of the present disclosure. FIG. 7 will be described with reference to FIG. 1A.
[0083] At 702, the network device 104 transmits, to the terminal device 102, an indication indicative of an optimization on measurement delays. At 704, the network device 104 receives, from the terminal device 102, an indication of carriers and measurement interruptions during at least one measurement. At 706, the network device 104 obtains, at least one reference carrier determined from the carriers and based on a criteria associated with measurement interruptions.
[0084] It is to be understood that the method 600 and / or method 700 may comprise further steps corresponding to the example embodiments as provided by FIGS. 2-5, and thus for the purpose of simplification, herein, the further steps will not be described again. By implementing the example embodiments as provided by the methods 600 and / or 700, the measurement delays and / or interruption ratio caused by performing the measurement can be minimized.
[0085] In some example embodiments, an apparatus capable of performing the method 600 (for example, the terminal device 102) may comprise means for performing the respective steps of the method 600. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0086] In some example embodiments, the apparatus comprises means for receiving, at a terminal device from a network device, an indication indicative of an optimization on measurement delays; means for obtaining, at the terminal device, at least one reference carrier determined based on a criteria associated with interruptions; and means for performing, at the terminal device, at least one measurement on the determined at least one reference carrier.
[0087] In some example embodiments, the means for obtaining the at least one reference carrier may comprise means for determining the at least one reference carrier based on the criteria associated with the interruptions. In some example embodiments, the means for determining the at least one reference carrier may comprise means for determining a reference carrier on a frequency group based on the criteria associated with the interruptions.
[0088] In some example embodiments, the means for determining the reference carrier may comprise means for determining the reference carrier on the frequency group based on selecting a carrier which, when performing measurements, not causing interruptions from the one or more carriers as the reference carrier, or based on selecting a carrier which, when performing measurements, causing interruptions from the one or more carriers as the reference carrier.
[0089] In some example embodiments, the apparatus may further comprise means for selecting a carrier from the one or more carriers which do not cause interruption based on determining that one or more carriers on the frequency group do not cause interruptions. In some example embodiments, the apparatus may further comprise means for selecting a carrier from the one or more carriers based on determining that all of the one or more carriers on the frequency group cause interruptions.
[0090] In some example embodiments, the apparatus may further comprise means for selecting a carrier with the least interruption potential from the one or more carriers based on determining that the one or more carriers on the frequency group cause interruptions. In some example embodiments, the means for obtaining the at least one reference carrier may comprise means for receiving, from the network device, an indication of the at least one reference carrier to be measured on a frequency group.
[0091] In some example embodiments, the apparatus may further comprise means for performing other steps in some embodiments of the method 600. In some example embodiments, the means comprises at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
[0092] In some example embodiments, an apparatus capable of performing the method 700 (for example, the network device 104) may comprise means for performing the respective steps 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.
[0093] In some example embodiments, the apparatus comprises means for transmitting, at a network device to a terminal device, an indication indicative of an optimization on measurement delays; means for receiving, at the network device from the terminal device, an indication of carriers and measurement interruptions during at least one measurement; and means for obtaining, at the network device, at least one reference carrier determined from the carriers and based on a criteria associated with measurement interruptions.
[0094] In some example embodiments, the means for obtaining the at least one reference carrier may comprise means for determining the at least one reference carrier based on the criteria associated with the interruptions. In some example embodiments, the means for determining the at least one reference carrier may comprise means for determining a reference carrier on a frequency group based on the criteria associated with the interruptions.
[0095] In some example embodiments, the means for determining the reference carrier may comprise means for determining the reference carrier on the frequency group based on selecting a carrier which, when performing measurements, not causing interruptions from the one or more carriers as the reference carrier, or based on selecting a carrier which, when performing measurements, causing interruptions from the one or more carriers as the reference carrier.
[0096] In some example embodiments, the apparatus may further comprise means for selecting a carrier from the one or more carriers which do not cause interruption based on determining that one or more carriers on the frequency group do not cause interruptions. In some example embodiments, the apparatus may further comprise means for selecting a carrier from the one or more carriers based on determining that all of the one or more carriers on the frequency group cause interruptions.
[0097] In some example embodiments, the apparatus may further comprise means for selecting a carrier with the least interruption potential from the one or more carriers based on determining that the one or more carriers on the frequency group cause interruptions. In some example embodiments, the apparatus may further comprise means for configuring the terminal device to measure the selected carrier of the frequency group. In some example embodiments, the means for obtaining the at least one reference carrier may comprise means for receiving, from the terminal device, an indication of the at least one reference carrier to be measured on a frequency group.
[0098] In some example embodiments, the apparatus may further comprise means for performing other steps in some embodiments of the method 700. In some example embodiments, the means comprises at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
[0099] Reference is made to FIG. 8, which illustrates an example simplified block diagram of a device 800 that is suitable for implementing embodiments of the present disclosure. The device 800 may be provided to implement the communication device, for example the terminal device 102 or the network device 104 as shown in FIG. 1A. As shown, the device 800 includes one or more processors 810, one or more memories 820 may couple to the processor 810, and one or more communication modules 840 may couple to the processor 810.
[0100] The communication module 840 is for bidirectional communications. The communication module 840 has at least one antenna to facilitate communication. The communication interface may represent any interface that is necessary for communication with other network elements, for example the communication interface may be wireless or wireline to other network elements, or software-based interface for communication.
[0101] The processor 810 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 800 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.
[0102] The memory 820 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) 824, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and / or optical storage. Examples of the volatile memories include, but are not limited to, a random-access memory (RAM) 822 and other volatile memories that will not last in the power-down duration.
[0103] A computer program 830 includes computer executable instructions that are executed by the associated processor 810. The program 830 may be stored in the ROM 824. The processor 810 may perform any suitable actions and processing by loading the program 830 into the RAM 822.
[0104] The embodiments of the present disclosure may be implemented by means of the program so that the device 800 may perform any process of the disclosure as discussed with reference to FIGS. 6 and 7. The embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
[0105] In some embodiments, the program 830 may be tangibly contained in a computer readable medium which may be included in the device 800 (such as in the memory 820) or other storage devices that are accessible by the device 800. The device 800 may load the program 830 from the computer readable medium to the RAM 822 for execution. The computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like. FIG. 9 shows an example of the computer readable medium 900 in form of CD or DVD. The computer readable medium has the program 830 stored thereon.
[0106] 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, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
[0107] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the method 600 or 700 as described above with reference to FIG. 6 or 7. 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.
[0108] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
[0109] In the context of the present disclosure, the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.
[0110] 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. 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) .
[0111] Further, while 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, while 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. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
[0112] 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 implementing the claims.
Claims
1.A terminal device comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to:receive, from a network device, an indication indicative of an optimization on measurement delays;obtain at least one reference carrier determined based on a criteria associated with interruptions; andperform at least one measurement on the determined at least one reference carrier.2.The terminal device of claim 1, wherein the optimization on measurement delays comprises at least one of the following:minimizing a carrier specific scaling factor (CSSF) ;minimizing interruptions for the terminal device during the at least one measurement; orminimizing a number of carriers to be measured.3.The terminal device of claim 1 or 2, wherein the indication indicative of the optimization indicates that the optimization on measurement delays is enabled.4.The terminal device of any of claims 1-3, wherein the terminal device is caused to obtain the at least one reference carrier by:determining the at least one reference carrier based on the criteria associated with the interruptions.5.The terminal device of claim 4, wherein the terminal device is caused to determine the at least one reference carrier by:determining a reference carrier on a frequency group based on the criteria associated with the interruptions.6.The terminal device of claim 5, wherein the terminal device is caused to determine the reference carrier on the frequency group based on the criteria associated with the interruptions by:determining the reference carrier on the frequency group based on:selecting a carrier which, when performing measurements, not causing interruptions from the one or more carriers as the reference carrier; orselecting a carrier which, when performing measurements, causing interruptions from the one or more carriers as the reference carrier.7.The terminal device of any of claims 1-6, wherein the terminal device is further caused to:based on determining that one or more carriers on the frequency group do not cause interruptions, select a carrier from the one or more carriers which do not cause interruption; orbased on determining that all of the one or more carriers on the frequency group cause interruptions, select a carrier from the one or more carriers.8.The terminal device of claim 7, wherein the terminal device is further caused to:based on determining that the one or more carriers on the frequency group cause interruptions, select a carrier with the least interruption potential from the one or more carriers.9.The terminal device of any of claims 1-8, wherein the terminal device is caused to obtain the at least one reference carrier by:receiving, from the network device, an indication of the at least one reference carrier to be measured on a frequency group.10.A network device comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the network device at least to:transmit, to a terminal device, an indication indicative of an optimization on measurement delays;receive, from the terminal device, an indication of carriers and measurement interruptions during at least one measurement; andobtain, at least one reference carrier determined from the carriers and based on a criteria associated with measurement interruptions.11.The network device of claim 10, wherein the optimization on measurement delays comprises at least one of the following:minimizing a carrier specific scaling factor (CSSF) ;minimizing interruptions for the terminal device during the at least one measurement; orminimizing a number of carriers to be measured.12.The network device of claim 10 or 11, wherein the indication indicative of the optimization indicates that the optimization on measurement delays is enabled.13.The network device of any of claims 10-12, wherein the network device is caused to obtain the at least one reference carrier by:determining the at least one reference carrier based on the criteria associated with the interruptions.14.The network device of claim 13, wherein the network device is caused to determine the at least one reference carrier by:determining a reference carrier on a frequency group based on the criteria associated with the interruptions.15.The network device of claim 14, wherein the network device is caused to determine the reference carrier on the frequency group based on the criteria associated with the interruptions by:determining the reference carrier on the frequency group based on:selecting a carrier which, when performing measurements, not causing interruptions from the one or more carriers as the reference carrier; orselecting a carrier which, when performing measurements, causing interruptions from the one or more carriers as the reference carrier.16.The network device of any of claims 10-15, wherein the network device is further caused to:based on determining that one or more carriers on the frequency group do not cause interruptions, select a carrier from the one or more carriers which do not cause interruption; orbased on determining that all of the one or more carriers on the frequency group cause interruptions, select a carrier from the one or more carriers.17.The network device of claim 16, wherein the network device is further caused to:based on determining that the one or more carriers on the frequency group cause interruptions, select a carrier with the least interruption potential from the one or more carriers.18.The network device of claim 16 or 17, wherein the network device is further caused to:configure the terminal device to measure the selected carrier of the frequency group.19.The network device of any of claims 10-18, wherein the network device is caused to obtain the at least one reference carrier by:receiving, from the terminal device, an indication of the at least one reference carrier.20.A method comprising:receiving, at a terminal device from a network device, an indication indicative of an optimization on measurement delays;obtaining, at the terminal device, at least one reference carrier determined based on a criteria associated with interruptions; andperforming, at the terminal device, at least one measurement on the determined at least one reference carrier.21.A method comprising:transmitting, at a network device to a terminal device, an indication indicative of an optimization on measurement delays;receiving, at the network device from the terminal device, an indication of carriers and measurement interruptions during at least one measurement; andobtaining, at the network device, at least one reference carrier determined from the carriers and based on a criteria associated with measurement interruptions.22.An apparatus comprising:means for receiving, at a terminal device from a network device, an indication indicative of an optimization on measurement delays;means for obtaining, at the terminal device, at least one reference carrier determined based on a criteria associated with interruptions; andmeans for performing, at the terminal device, at least one measurement on the determined at least one reference carrier.23.An apparatus comprising:means for transmitting, at a network device to a terminal device, an indication indicative of an optimization on measurement delays;means for receiving, at the network device from the terminal device, an indication of carriers and measurement interruptions during at least one measurement; andmeans for obtaining, at the network device, at least one reference carrier determined from the carriers and based on a criteria associated with measurement interruptions.24.A computer readable medium comprising program instructions stored thereon for performing at least the method of claim 20 or 21.
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