Acquisition of system information block
The method of transmitting SIB1 transmission mode indications via a modified MIB in 5G systems addresses the challenge of indicating on-demand SIB1 modes, enabling efficient power-saving operations and reducing latency by clarifying cell support for anchor cells.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2026-03-19
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Figure CN2024118091_19032026_PF_FP_ABST
Abstract
Description
ACQUISITION OF SYSTEM INFORMATION BLOCKFIELD
[0001] Various example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, devices, apparatuses and computer readable storage medium for acquisition of system information block (SIB) .BACKGROUND
[0002] A User Equipment (UE) may acquire SIB1 based on MIB content, which defines when and where the UE shall monitor for the Downlink Control Information that schedules SIB1 periodically. SIB1 may include information regarding the availability and scheduling (e.g., mapping of SIBs to SI message, periodicity, SI-window size) of other SIBs with an indication whether one or more SIBs are only provided on-demand, and in that case, the configuration needed by the UE to perform the SI request.SUMMARY
[0003] 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 SIB1 transmission mode indication indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; and initiate an acquisition of the SIB1 of the cell based on the SIB1 transmission mode indication.
[0004] 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: generate a SIB1 transmission mode indication for a first apparatus indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell transmit the SIB1 transmission mode indication to the first apparatus.
[0005] In a third 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 target cell, a SIB1 transmission mode indication indicating whether the target cell supports one of: broadcast SIB1 mode; on-demand SIB1 mode without support of an anchor cell; or on-demand SIB1 mode with support of at least one anchor cell; apply an interruption time in paging reception associated with an indicated SIB1 transmission mode for a cell reselection.
[0006] In a fourth aspect of the present disclosure, there is provided a method. The method comprises: receiving, from a second apparatus, a SIB1 transmission mode indication indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; and initiating an acquisition of the SIB1 of the cell based on the SIB1 transmission mode indication.
[0007] In a fifth aspect of the present disclosure, there is provided a method. The method comprises: generating a SIB1 transmission mode indication for a first apparatus indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell transmitting the SIB1 transmission mode indication to the first apparatus.
[0008] In a sixth aspect of the present disclosure, there is provided a method. The method comprises: receiving, from a target cell, a SIB1 transmission mode indication indicating whether the target cell supports one of: broadcasting SIB1 mode; on-demanding SIB1 mode without support of an anchor cell; or on-demanding SIB1 mode with support of at least one anchor cell; applying an interruption time in paging reception associated with an indicated SIB1 transmission mode for a cell reselection.
[0009] In a seventh aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises means for receiving, from a second apparatus, a SIB1 transmission mode indication indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; and means for initiating an acquisition of the SIB1 of the cell based on the SIB1 transmission mode indication.
[0010] In an eighth aspect of the present disclosure, there is provided a second apparatus. The second apparatus comprises means for generating a SIB1 transmission mode indication for a first apparatus indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell means for transmitting the SIB1 transmission mode indication to the first apparatus.
[0011] In a ninth aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises means for receiving, from a target cell, a SIB1 transmission mode indication indicating whether the target cell supports one of: means for broadcasting SIB1 mode; means for on-demanding SIB1 mode without support of an anchor cell; or means for on-demanding SIB1 mode with support of at least one anchor cell; means for applying an interruption time in paging reception associated with an indicated SIB1 transmission mode for a cell reselection.
[0012] In a tenth aspect of the present disclosure, there is provided a computer readable medium. The computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the fourth aspect.
[0013] In an eleventh aspect of the present disclosure, there is provided a computer readable medium. The computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the fifth aspect.
[0014] In a twelfth aspect of the present disclosure, there is provided a computer readable medium. The computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the sixth aspect.
[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, where:
[0017] FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented;
[0018] FIG. 2A-2C illustrates diagrams showing examples of the communication of SIB configuration;
[0019] FIG. 3 illustrates a signaling chart for a communication in accordance with some example embodiments of the present disclosure;
[0020] FIG. 4 illustrates a signaling chart for a communication in accordance with some example embodiments of the present disclosure;
[0021] FIG. 5 illustrates a signaling chart for a communication in accordance with some example embodiments of the present disclosure;
[0022] FIGS. 6A and 6B illustrates diagrams for communications in accordance with some example embodiments of the present disclosure;
[0023] FIG. 7 illustrates a signaling chart for a communication in accordance with some example embodiments of the present disclosure;
[0024] FIG. 8 illustrates a flowchart of a method implemented at a first apparatus in accordance with some example embodiments of the present disclosure;
[0025] FIG. 9 illustrates a flowchart of a method implemented at a second apparatus in accordance with some example embodiments of the present disclosure;
[0026] FIG. 10 illustrates a flowchart of a method implemented at a first apparatus in accordance with some example embodiments of the present disclosure;
[0027] FIG. 11 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure; and
[0028] FIG. 12 illustrates a block diagram of an example computer readable medium in accordance with some example embodiments of the present disclosure.
[0029] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0030] Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. Embodiments described herein can be implemented in various manners other than the ones described below.
[0031] 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.
[0032] 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.
[0033] 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.
[0034] 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.
[0035] As used herein, unless stated explicitly, performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.
[0036] 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.
[0037] As used in this application, the term “circuitry” may refer to one or more or all of the following:
[0038] (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and
[0039] (b) combinations of hardware circuits and software, such as (as applicable) :
[0040] (i) a combination of analog and / or digital hardware circuit (s) with software / firmware and
[0041] (ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause a first apparatus, such as a mobile phone or server, to perform various functions) and
[0042] (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.
[0043] 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.
[0044] 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 performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) , 5.5G, the sixth generation (6G) communication protocols, and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.
[0045] 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.
[0046] 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.
[0047] As used herein, the term “resource, ” “transmission resource, ” “resource block, ” “physical resource block” (PRB) , “uplink resource, ” or “downlink resource” may refer to any resource for performing a communication, for example, a communication between a terminal device and a network device, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other combination of the time, frequency, space and / or code domain resource enabling a communication, and the like. In the following, unless explicitly stated, a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.
[0048] FIG. 1 illustrates an example communication environment 100 in which example embodiments of the present disclosure can be implemented. As shown in FIG. 1, the communication network 100 may comprise a first apparatus 110 which may be, for example, a terminal device. In some example embodiments, the terminal device may also be discussed as a UE.
[0049] The communication network 100 may further comprise a second apparatus 120, which may be, for example, a network device. In some example embodiments, the network device may be discussed as a BS, a gNB, or an eNB.
[0050] A serving area provided by the first apparatus 110 is called a cell 102. The second apparatus 120 may communicate with the first apparatus 110 within the cell 102. The cell currently serving the second apparatus 120 may be considered as a serving cell.
[0051] In some example scenarios, the cell 102 provided by the second apparatus 120 may be referred to as a network energy saving (NES) cell. A NES cell may operate in the ‘on-demand (OD) SIB1 mode’ (i.e., it does not broadcast SIB1 periodically, instead its SIB1 transmission is triggered by a request from the UE) . The NES cell may also be referred to as a capacity cell.
[0052] In some example scenarios, an anchor cell may be required to support the on-demand SIB1 operation of the NES cell, e.g., the cell 102. As an example, the cell 104 managed by a fourth apparatus 130 may be considered as an anchor cell. The cell 104 (e.g., as an anchor cell) may have an overlapping coverage area with the cell 102 (e.g., as an NES cell) , and the cell 104 may act towards the UE as ‘anchor’ providing some of the cell 102’s control plane. In other words, the single NES cell might not operate (or cannot operate) in the OD-SIB1 mode in 5G, and the NES cell may require a two-carrier scenario involving the cell 102 and the cell 104 (anchor cell) .
[0053] In some example scenarios, a cell reselection may be triggered at the first apparatus 110. For example, when the connectivity of the serving cell (e.g., cell 102) is getting worse, the first apparatus 110 may consider switching to another cell, which may be considered as the target cell. For example, the cell 106 managed by the third apparatus 140 may be referred to as the target cell. It is to be understood that the source cell and the target cell may also be managed by a same network node. In this case, the third apparatus 140 and the second apparatus may be the same one.
[0054] In some example embodiments, if the first apparatus 110 is a terminal device and second apparatus 120 is a network device, a link from the second apparatus 120 to first apparatus 110 is referred to as a downlink (DL) , while a link from the first apparatus 110 to second apparatus 120 is referred to as an uplink (UL) . In DL, the second apparatus 120 is a transmitting (TX) apparatus (or a transmitter) and the first apparatus 110 is a receiving (RX) apparatus (or a receiver) . In UL, the first apparatus 110 is a TX apparatus (or a transmitter) and the second apparatus 120 is a RX apparatus (or a receiver) .
[0055] It is to be understood that the number of network devices and terminal devices shown in FIG. 1 is given for the purpose of illustration without suggesting any limitations. The communication environment 100 may include any suitable number of network devices and terminal devices.
[0056] Communications in the communication environment 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) , the sixth generation (6G) , and the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and / or any other protocols currently known or to be developed in the future. Moreover, the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple (OFDM) , Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and / or any other technologies currently known or to be developed in the future.
[0057] As described above, a UE may acquire SIB1 based on MIB content, which defines when and where the UE shall monitor for the Downlink Control Information that schedules SIB1 periodically.
[0058] Improved 6G design of MIB such as on-demand SIB1 and on-demand SSB can enable NES schemes. Some objectives of proposed schemes are shown in the following Table 1:
[0059] Table 1
[0060] With regard to on-demand SIB1, the intention is that a capacity cell will not periodically broadcast the SIB1. Instead, the capacity cell (or a corresponding anchor / coverage cell of the capacity cell) will provide the SIB1 on-demand, i.e., based on the UE requesting the transmission of SIB1. As can be seen from the objective, the UE will trigger the transmission by sending a wake-up signal (WUS) , which could e.g., be a random access preamble. The WUS herein used may also be referred to as a request for SBI1 in some scenarios as below. This requires that the UE is configured to transmit the WUS.
[0061] With regard to on-demand SSB, the intention is that a capacity cell may not periodically transmit SSBs. Instead, the capacity cell will provide the SSB on-demand, i.e., based on the UE’s need for SSBs.
[0062] In the NR, the MIB may indicate “regular SIB1” and “no SIB1” transmissions. In other words, both the “regular SIB1” transmission and “no SIB1” may be indicated in the MIB reusing the same MIB’s IEs.
[0063] In some discussed schemes of the NR, it is considered that the on-demand SIB1 (OD-SIB1) procedure will be assisted by an anchor cell.
[0064] The MIB containing an index (at least one bit) to a table / set of preconfigured physical downlink control channel (PDCCH) configurations of the ‘SIB1 request configuration’ has been proposed.
[0065] As described in some discussed schemes, the System Information (SI) associated with the MIB and the SIB1 according to some discussed schemes is shown in the following Table 2:
[0066] Table 2
[0067] Upon receiving the SI and the MIB, some actions are taken by the UE as shown in the following Table 3:
[0068] Table 3
[0069] In some scenarios, there may be some essential SI missing, and the UE may perform some actions as shown in Table 4:
[0070] Table 4
[0071] The MIB includes the SI transmitted on BCH, as shown in the following Table 5.
[0072] Table 5
[0073] In some discussed schemes, there are requirements regarding the maximum interruption in paging reception allowed by the UE, as shown in Table 6.
[0074] Table 6
[0075] As described above, a cell (e.g., the cell 102 in FIG. 1) may be able to operate in on-demand SIB1 mode. However, it is not possible in 5G to indicate such on-demand SIB1 mode in the MIB payload alone in order not to confuse the legacy UEs (UEs configured to operate according to previous standard releases such as release 18 and earlier releases) .
[0076] Therefore, there might be the need of an anchor cell (e.g., the cell 104 in FIG. 1) to support the on-demand SIB1 operation of a capacity cell (e.g., the cell 102 in FIG. 1) . FIG. 2A and FIG. 2B show two scenarios for OD-SIB1 transmission with an anchor cell.
[0077] In FIG. 2A, the UE 210 is in RRC idle or RRC inactive mode and the suitable target cell (i.e., NES cell 202) of the UE 210 operates in ‘on-demand SIB1 mode’ . In order for the UE 210 to transmit the SIB1 request, the UE 210 first needs to acquire the ‘SIB1 request’ configuration (referred to as WUS configuration) , so that the UE knows which resources the UE can use to transmit the SIB1 request. However, when there is no SIB1 available from the NES cell 202, the NES cell 202 itself is unable to provide the ‘SIB1 request’ configuration.
[0078] The SIB1 is the first information the UE 210 reads in a cell currently (after the MIB) , and SIB1 defines how all other SIBs can be acquired. This means that the NES cell 202 to operate in the on-demand SIB1 mode requires that another cell (anchor cell 204) provides the configuration on its behalf (i.e. anchor cell 204 has to transmit the SIB1 request configuration of the NES cell 202 in its SIB1 or in another of its SIBs) .
[0079] As described above, the anchor cell 204 is referred to as an anchor cell of the NES cell 202 and is defined as the cell which has overlapping coverage area with the NES cell 202, and which acts towards the UE 210 as ‘anchor’ providing some of the NES cell’s control plane. In other words, the single NES cell 202 cannot operate in on-demand SIB1 mode in 5G but requires a two-carrier scenario involving the NES cell 202 and an anchor cell (i.e. anchor cell 204) .
[0080] As shown in FIG. 2A, the UE 210 receives (240) the WUS configuration from the cell 204. Then the UE 210 transmits (245) the OD-SIB1 request to the NES cell 202. Lastly, the UE 210 receives (250) the OD-SIB1 from the NES cell 102 based on the OD-SIB1 request and the WUS configuration.
[0081] As shown in FIG. 2B, in another scenario, the UE 210 receives (260) the WUS configuration from the anchor cell 204. Then the UE 210 transmits (265) the OD-SIB1 request to the anchor cell 204. Lastly, the UE 210 receives (270) the OD-SIB1 from the anchor cell 204 based on the OD-SIB1 request and the WUS configuration.
[0082] In 6G and possibly in future RATs, the restriction on the MIB may be changed (i.e., the MIB content can be different compared to 5G) , and therefore an OD-SIB1 operation without an anchor cell may become feasible and thus attractive.
[0083] FIG. 3C shows an example scenario of performing the OD-SIB1 transmission without the support of an anchor cell.
[0084] As shown in FIG. 2C, the UE 210 first receives (280) the WUS configuration from the NES cell 202. Then the UE 210 transmits (285) the OD-SIB1 request to the NES cell 202. Lastly, to the UE 210 receives (290) the OD-SIB1 from the NES cell 202.
[0085] The reason why the OD-SIB1 can achieve power saving is that the NES cell 202 will consume less power if it transmits only SSB and no SIB1. However, the OD-SIB1 procedure shown in FIG. 2A and FIG. 2B may be slower than the procedure without an anchor cell. Therefore, some operators may prefer the non-standalone mode ‘with anchor cell’ and others non-standalone mode ‘without anchor cell’ depending on their view on the network energy saving vs latency tradeoff.
[0086] It is not clear how to indicate different SIB1 transmission mode to UE, for example, when non-standalone OD-SIB1 mode or non-standalone OD-SIB1 mode is to be used. Therefore, an adaptation of SIB1 transmission mode indication will be discussed.
[0087] In accordance with some example embodiments of the present disclosure, there is provided a method, wherein a SIB1 transmission mode indication is transmitted from the second apparatus 120 to the first apparatus 110 to indicate whether a cell provided by the second apparatus 120 supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell. Upon receiving SIB1 transmission mode indication, a process of acquisition of the SIB 1 is initiated by the first apparatus 110. In this way, it can be indicated to the UE which SIB1 mode is supported in the cell, and power saving of the cell (e.g. NES cell) can be achieved. For example, the indication may be in a MIB whereby a flexible MIB design can be implemented.
[0088] Reference is now made to FIG. 3, which shows a signaling chart 300 for communication according to some example embodiments of the present disclosure. As shown in FIG. 3, the signaling chart 300 involves a first apparatus 110 and a second apparatus 120. For the purpose of discussion, reference is made to FIG. 1 to describe the signaling chart 300.
[0089] The signaling chart 300 shows a general process of performing the OD-SIB1 transmission (which may be referred as the acquisition of SIB1 as well) with a new MIB design. The new MIB design includes a new MIB Information Elements (IE) that enable the MIB to indicate to the UE the ‘SIB1 mode’ currently used by a cell out of a set of SIB1 modes that could be potentially used by the cell (e.g. for energy saving purposes) .
[0090] As shown in the FIG. 3, the first apparatus 110 is in a RRC idle / inactive state as shown at block 305. The second apparatus 120 may transmit (310) a SIB1 transmission mode indication to the first apparatus 110. For example, the SIB1 transmission mode indication may be transmitted via a MIB, e.g., by using a new IE. Alternatively, the SIB1 transmission mode indication may also be transmitted via a PBCH channel.
[0091] In some embodiments, the SIB1 transmission mode indication may comprise 4 SIB1 transmission modes, namely a regular SIB1 mode, a no-SIB1 mode, an OD-SIB1-without-anchor cell mode and an OD-SIB1-with anchor cell mode.
[0092] When using the regular SIB1 mode, the second apparatus 120 may broadcast the SIB1 regularly, and the MIB may indicate a PDCCH configuration for the SIB1 scheduling.
[0093] As an example, the SIB1 periodicity and SIB1 repetition periodicity may be hard coded or equal to the SSB periodicity, and therefore does not need to be indicated in MIB. It is noted that the SSB transmission does not consume much energy, instead the SIB1 transmission is much more costly. Therefore, it is beneficial to omit SIB1 but not necessarily beneficial to omit SSB transmissions.
[0094] When using the no-SIB1 mode, the second apparatus 120 may not broadcast the SIB1. The MIB may indicate “no SIB1’ indication, and MIB may further indicate ‘the location where to find an available SIB1’ .
[0095] When using the OD-SIB1 mode, similarly, the second apparatus 120 may not broadcast the SIB1. The second apparatus 120 may operate with SIB1 on-demand in the OD-SIB1 standalone mode, i.e., without an anchor cell or in the OD-SIB1 non-standalone mode, i.e., with an anchor cell.
[0096] In OD-SIB1 standalone mode (i.e. the on-demand SIB1 mode without support of an anchor cell) , the MIB may indicate ‘On-demand-SIB1 standalone mode’ , and the MIB provides all the necessary information to obtain the SIB1 on-demand.
[0097] As an option, MIB may indicate “PDCCH config for ‘SIB1 Request Config’ scheduling” , i.e., the PDCCH configuration for the UE to monitor for the DCI that schedules the SIB1 Request Config.
[0098] As another option, the MIB may indicate scheduling of ‘SIB1 Request Config’ , i.e. MIB directly indicates the scheduling information for the SIB1 Request Config, e.g., by indexing to a pre-defined table with time, frequency and MCS allocations and other transmission parameters (e.g. HARQ-related, similar to the content of the DCI carrying scheduling information) .
[0099] In OD-SIB1 non-standalone mode (i.e. the on-demand SIB1 mode with support of an anchor cell) , the MIB may indicate ‘OD-SIB1 non-standalone mode’ , and in this case, the NES cell’s MIB may indicate the Frequency Layer (s) and optionally the PCIs (cell identifiers) of the anchor cell (s) , where the first apparatus 120 can obtain the ‘SIB1 Request Config’ for the NES cell.
[0100] More details associated with the OD-SIB1 standalone mode and the OD-SIB1 non-standalone mode will be described with reference to FIGS. 4-5 later.
[0101] An example of a SIB transmission mode indicated explicitly via dedicated new parameter (s) in the MIB message is shown in the following Table 8. In the Table 8 the new IEs are bolded.
[0102] Table 8
[0103] Still referring to FIG. 3, the first apparatus 110 may read (315) the MIB and store the information on the SIB1 transmission mode. Then the first apparatus 110 may determine (320) whether to acquire SIB1 at least based on the SIB1 transmission mode.
[0104] In some example embodiments, the first apparatus 110 may determine when to acquire SIB1 at least based on the SIB1 transmission mode because for example this may impact the timing / delay with which the first apparatus 110 should perform certain operations on that cell (e.g. timing of triggering cell reselection and monitor paging) . For example, the SIB1 mode may impact when (how early) the first apparatus 110 would need to trigger the acquisition of SIB1 prior to a paging occasion or prior to a cell reselection, because the time to acquire SIB1 depends on the SIB1 transmission mode.
[0105] Especially when the OD-SIB1 standalone mode or the OD-SIB1 non-standalone mode are used, the first apparatus 110 may also obtain, from the MIB, a configuration for the first apparatus 110 to send the OD-SIB1 request. More details will be described with reference to FIGS. 4-5 later.
[0106] If the first apparatus 110 determines to acquire SIB1, the first apparatus 110 may trigger the SIB1 acquisition process based on the indicated SIB1 transmission mode.
[0107] Then the first apparatus 110 and the second apparatus 120 may perform (330) the SIB1 acquisition based at least on the SIB 1 transmission mode and the related configuration.
[0108] Reference is now made to FIG. 4, which shows a signaling chart 400 for communication according to some example embodiments of the present disclosure. As shown in FIG. 4, the signaling chart 400 involves a first apparatus 110 and a second apparatus 120. For the purpose of discussion, reference is made to FIG. 1 to describe the signaling chart 400.
[0109] FIG. 4 shows a scenario where a SIB1 transmission mode of OD-SIB1-without anchor cell is indicated by the second apparatus 120 and the SIB1 transmission process is performed without the assistance of any anchor cell.
[0110] Similar to FIG. 3, the first apparatus 110 is in a RRC idle / inactive state as shown at block 405. The second apparatus 120 may transmit (410) a SIB1 transmission mode indication to the first apparatus 110. The SIB1 transmission mode indication may be one of the 4 SIB1 transmission modes, namely a regular SIB1 mode, a no-SIB1 mode, an OD-SIB1-without-anchor cell mode and an OD-SIB1-with anchor cell mode.
[0111] In this case, the SIB1 transmission mode indication received from the second apparatus 120 may indicate a cell provided by the second apparatus 120 supports on-demand SIB1 mode without support of an anchor cell 104. In this scenario, the cell provided by the second apparatus 120 may be considered a NES cell 102.
[0112] In some embodiments, the OD-SIB1 mode without support of an anchor cell may also be referred to as the OD-SIB1 standalone mode, which indicates that the MIB transmitted be the second apparatus 120 can provide all the necessary information to obtain the SIB1 on-demand.
[0113] In some example embodiments, the SIB1 transmission mode indication may be received via a MIB and / or received via a PBCH. As an example, the MIB may comprise a new IE indicating the SIB1 transmission mode.
[0114] Upon determining that the SIB1 transmission mode indication indicates that the NES cell 102 provided by the second apparatus 120 supports on-demand SIB1 mode without support of the anchor cell 104, the first apparatus 110 may initiate the acquisition of the SIB1 according to a configuration received from the second apparatus 120.
[0115] In this situation, the first apparatus 110 may read and store (415) the information on the SIB1 transmission mode, e.g., including: PDCCH configuration for SIB1 request configuration scheduling or SIB1 request configuration scheduling.
[0116] Specifically, as an option, the MIB from the second apparatus 120 may indicate a PDCCH configuration for the UE to monitor for the DCI that schedules the SIB1 request configuration.
[0117] Based on the obtained PDCCH configuration, the first apparatus 110 may monitor (420) the DCI according to the PDCCH configuration to obtain the SIB1 request configuration. That is, by monitoring for the DCI, the first apparatus 110 may receive (425) , from the second apparatus 120, the SIB1 request configuration via the DCI through the PDCCH. Moreover, the PDSCH may be scheduled by the DCI for transmitting the SIB1 request configuration.
[0118] Then the first apparatus 110 may then transmit (430) , to the second apparatus 120, an on-demand SIB1 request according to the obtained SIB1 request configuration. Upon receiving the SIB1 request, the second apparatus 120 may send (435) the SIB1 to the first apparatus 110.
[0119] As another option, the configuration received from the second apparatus 120 may comprise a SIB1 request configuration scheduling. For example, MIB from the second apparatus 120 can indicate scheduling of ‘SIB1 Request Configuration’ , i.e., the MIB may directly indicates the scheduling information for the SIB1 Request Configuration.
[0120] In some example embodiments, the configuration received from the second apparatus 120 may indicate the SIB1 request configuration scheduling via an index to a pre-defined table with at least one time allocation and / or at least one frequency allocation and / or at least one modulation and coding scheme (MCS) allocation. Moreover, other transmission parameters such as the HARQ-related parameters similar to the content of the DCI carrying scheduling information may also indicate the SIB1 request configuration scheduling.
[0121] Based on the received SIB1 request configuration scheduling, the first apparatus 110 may receive (425) the SIB1 request configuration. Upon determining the trigger of SIB1 acquisition, the first apparatus 110 may transmit (430) , to the second apparatus 120, an on-demand SIB1 request according to the SIB1 request configuration. Upon receiving the SIB1 request, the second apparatus 120 may send (435) the SIB1 to the first apparatus 110.
[0122] Reference is now made to FIG. 5, which shows a signaling chart 500 for communication according to some example embodiments of the present disclosure. As shown in FIG. 5, the signaling chart 500 involves a first apparatus 110, a second apparatus 120 and a fourth apparatus 130. For the purpose of discussion, reference is made to FIG. 1 to describe the signaling chart 500.
[0123] FIG. 5 shows a scenario where a SIB1 transmission mode of OD-SIB1-with anchor cell is indicated by the second apparatus 120 and the SIB1 transmission process is performed with the assistance or support of an anchor cell. The second apparatus 120 here may manage the NES cell 102 and the fourth apparatus 130 may manage the anchor cell 104.
[0124] The second apparatus 120 may transmit (510) a SIB1 transmission mode indication to the first apparatus 110. The SIB1 transmission mode indication may be one of the 4 SIB1 transmission modes, namely a regular SIB1 mode, a no-SIB1 mode, an OD-SIB1-without-anchor cell mode and an OD-SIB1-with anchor cell mode.
[0125] In this case, the SIB1 transmission mode indication received from the second apparatus 120 may indicate a NES cell 102 provided by the second apparatus 120 supports on-demand SIB1 mode with support of at least one anchor cell, e.g., the anchor cell 104.
[0126] Then the first apparatus 110 may read and store (515) the information on SIB1 transmission mode. For example, the information may comprise information associated with the anchor cell.
[0127] As an example, the information of the anchor cell received from the second apparatus 120 may comprise one or more frequency layers associated with the anchor cell and / or a cell identifier of the anchor cell. For example, the MIB from the NES cell 102 may indicate the frequency layer and the PCI of the anchor cell where the first apparatus 110 can obtain the SIB1 request configuration from.
[0128] Based on determining that the SIB1 transmission mode indication indicates that the cell provided by the second apparatus 120 supports on-demand SIB1 mode with support of the anchor cell 104, the first apparatus 110 may determine (520) an anchor cell based on information of the anchor cell received from the second apparatus 120.
[0129] In some embodiments, the first apparatus 110 may acquire (525) an SIB1 request configuration from the fourth apparatus 130 (i.e., the anchor cell 104) . For example, the terminal device may acquire a WUS configuration of the NES cell 102 as the SIB1 request configuration from the determined anchor cell 104.
[0130] Based on the SIB1 request configuration, the first apparatus 110 may request the SIB1 from the second apparatus (i.e., the NES cell 102) or from the fourth apparatus (i.e., the anchor cell 104) .
[0131] In some embodiments, the first apparatus 110 may transmit, to the anchor cell 104, an on-demand SIB1 request according to the SIB1 request configuration acquired from the anchor cell 104. Then the first apparatus 110 may receive the SIB1 from the anchor cell 104.
[0132] In some other embodiments, the first apparatus 110 may transmit, to the second apparatus 120, an on-demand SIB1 request according to the SIB1 request configuration acquired from the anchor cell 104. Then the first apparatus 110 may receive the SIB1 from the second apparatus 120.
[0133] With reference to FIGS. 6A and 6B, the scenario where the SIB1 transmission process is performed with the assistance of an anchor cell will be further described.
[0134] In FIG. 6A and FIG. 6B, acell provided by the second apparatus 120 may be referred to as a NES cell 102 and the cell provided by the fourth apparatus 130 may be an anchor cell 104.
[0135] As shown in FIG. 6A, as an option, the first apparatus 110 may receive (605) the OD-SIB1 request configuration from the anchor cell 104. Then the first apparatus 110 may transmit (610) , to the NES cell 102, the OD-SIB1 request via the PRACH based on the received OD-SIB1 request configuration and the first apparatus 110 may receive (615) the OD-SIB1 from the NES cell 102.
[0136] As shown in FIG. 6B, as another option, the first apparatus 110 may receive (620) the OD-SIB1 request configuration from the anchor cell 104. Then the first apparatus 110 may transmit (625) , to the anchor cell 104, the OD-SIB1 request via the PRACH based on the received OD-SIB1 request configuration.
[0137] Upon receiving the OD-SIB1 request, the anchor cell 104 may inform (627) the related configuration of the SIB1 transmission to the second apparatus 120. Then the first apparatus 110 may receive (630) the OD-SIB1 from the NES cell 102 provided by the second apparatus 120.
[0138] As described above, the UE may have to determine whether / when to acquire SIB1 at least based on the SIB1 transmission mode and the related configuration and needs to account for specific requirements (e.g. on the maximum paging interruption) which depend on the SIB1 transmission mode used by the cell.
[0139] As an example, the SIB1 transmission mode is currently used by the cell may impact the timing / delay with which the UE could / should perform certain operations on that cell (e.g. timing of triggering cell reselection and monitor paging) . For example, the SIB1 mode impacts when (how early) the UE would need to trigger the acquisition of SIB1 prior to a paging occasion or prior to a cell reselection, because the time to acquire SIB1 depends on the SIB1 transmission mode.
[0140] When the UE receives the MIB, which indicates the SIB1 transmission mode, the UE has to determine whether to reselect to the cell or not. One relevant condition for this decision is the requirement for the maximum interruption in paging reception.
[0141] The maximum interruption in paging reception defines the maximum time between the last Paging Occasion (PO) the UE monitors paging in the serving cell and the first PO the UE monitors paging in the target cell -after cell re-selection. The relationship to the SIB1 acquisition is as follows: The UE is capable to monitor for paging in the target cell only after it has acquired the SIB1 in the target cell because SIB1 includes basic information about the cell configuration and paging configuration, without which the UE would not know how to monitor paging. Therefore, the interruption time between the last PO-serving and the first PO-target depends on the delay for acquiring SIB1, which in turn depends on the SIB1 acquisition mode.
[0142] In some embodiments, the UE may perform the cell reselection only if it can comply with the legacy requirement on paging interruption. In another embodiment, the UE adjusts / complies with the corresponding paging interruption requirement associated with the SIB1 transmission mode used by the cell. For example, the requirement may be less strict (i.e. a larger value) if the UE has to request the SIB1 via on-demand signaling.
[0143] Behaviors of UE associated with a cell reselection according to the SIB1 transmission mode will be described in detail with reference to FIG. 7.
[0144] FIG. 7 shows a signaling chart 700 for communication according to some example embodiments of the present disclosure. As shown in FIG. 7, the signaling chart 700 involves a first apparatus 110, a second apparatus 120 and a third apparatus 140. For the purpose of discussion, reference is made to FIG. 1 to describe the signaling chart 700. In FIG. 7, a cell provided by the third apparatus 140 may be referred to as a target cell 106 and a cell provided by the second apparatus 120 may be referred to as a serving cell. The target cell 106 herein may be NES cell and the first apparatus may be a terminal device such as a UE.
[0145] As shown in FIG. 7, the cell 102 provided by the second apparatus 120 may serve (705) the first apparatus 110 as a serving cell where the RRC Idle / Inactive UE is camping.
[0146] In some embodiments, the first apparatus 110 may receive (710) , from a target cell, a SIB1 transmission mode indication indicating whether the target cell supports one of the broadcast SIB1 mode, the OD-SIB1 mode without support of an anchor cell or the OD-SIB1 mode with support of one or more anchor cells.
[0147] The SIB1 transmission mode may be received via a MIB, or the SIB1 transmission mode may be received via a PBCH.
[0148] In some embodiments, the first apparatus 110 may determine (715) the interruption time in paging reception associated with SIB1 transmission mode. In some embodiments, the interruption time may be a time period between the last PO associated with a serving cell of the first apparatus 110 and the first PO associated with the target cell (e.g., the cell 106) . As described above, the interruption time between the last monitored paging occasion of the serving cell and the first PO monitored on the target cell depends on the delay for acquiring SIB1, which in turn depends on the SIB1 acquisition mode. For example, when OD-SIB1 mode is used, a longer delay for acquiring the SIB1 may be caused compared to the regular SIB1 mode.
[0149] After determining the interruption time, the first apparatus 110 may determine (720) whether to perform the cell reselection to the target cell based on the interruption time and a requirement for a maximum interruption in the paging reception. Alternatively or in addition, the first apparatus 110 may directly apply the requirement corresponding to the SIB transmission mode that is used by the first apparatus 110.
[0150] For example, the maximum interruption in paging reception defines the maximum time between the last PO the terminal apparatus 110 monitors paging in the serving cell and the first PO the UE monitors paging in the target cell after cell re-selection.
[0151] The maximum interruption may relate to the parameter TSI-NR, which is the time required for receiving all the relevant system information data according to the reception procedure and the RRC procedure delay of SIBs for an NR cell. Different TSI-NR parameters (or parameter values) can be defined for the different potential SIB1 transmission modes that can be used by a cell so that the paging requirement is slightly more relaxed (i.e. increasing the maximum interruption in the paging reception) if other transmission modes that regular SIB1 are used.
[0152] In some embodiments, if the first apparatus 110 determines that the interruption time satisfies the requirement for the maximum interruption in the paging reception, the first apparatus 110 may perform the cell reselection to the target cell.
[0153] In some other embodiments, if the first apparatus 110 determines that the interruption time does not satisfy the requirement for the maximum interruption in the paging reception, the first apparatus 110 may update the requirement by increasing the maximum interruption in the paging reception. If the first apparatus 110 determines that the interruption time satisfies the updated requirement, the first apparatus may perform the cell reselection to the target cell. For example, the interruption time for a certain target cell satisfies the relaxed requirement, the first apparatus 110 may perform the cell reselection to the target cell.
[0154] In some other embodiments, if the first apparatus 110 determines that the interruption time does not satisfy the requirement for the maximum interruption in the paging reception (even if after the maximum interruption in the paging reception has been increased) , the first apparatus 110 may consider the target cell as barred.
[0155] The solution of the present disclosure can achieve a flexible MIB design to allow full flexibility to the NW to operate with different SIB1 modes. And by not broadcasting always the SIB1 regularly, the network can save energy by reducing unnecessary and costly SIB1 transmissions. Specific UE requirements are considered to allow smooth UE operations.
[0156] FIG. 8 shows a flowchart of an example method 800 implemented at a first apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 800 will be described from the perspective of the first apparatus 110 in FIG. 1.
[0157] At block 810, the first apparatus receives, from a second apparatus, a SIB1 transmission mode indication indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell.
[0158] At block 820, the first apparatus initiates an acquisition of the SIB1 of the cell based on the SIB1 transmission mode indication.
[0159] In some example embodiments, the cell provided by the second apparatus is a network energy saving, NES, cell.
[0160] In some example embodiments, the SIB1 transmission mode indication is received via a master information block, MIB, and / or via a physical broadcast channel, PBCH.
[0161] In some example embodiments, the method 800 further comprises: based on determining that the SIB1 transmission mode indication indicates that the cell provided by the second apparatus supports on-demand SIB1 mode without support of the anchor cell, initiating the acquisition of the SIB1 according to a configuration received from the second apparatus.
[0162] In some example embodiments, the method 800 further comprises: monitoring downlink control information, DCI, according to the downlink control channel configuration to obtain the SIB1 request configuration; transmitting, to the second apparatus, an on-demand SIB1 request according to the obtained SIB1 request configuration; and receiving the SIB1 from the second apparatus.
[0163] In some example embodiments, the method 800 further comprises: receiving the SIB1 request configuration according to the SIB1 request configuration scheduling; transmitting, to the second apparatus, an on-demand SIB1 request according to the SIB1 request configuration; receiving the SIB1 from the second apparatus.
[0164] In some example embodiments, the configuration received from the second apparatus indicates the SIB1 request configuration scheduling via an index to a pre-defined table with at least one of the following: at least one time allocation, at least one frequency allocation, or at least one modulation and coding scheme, MCS, allocation.
[0165] In some example embodiments, the method 800 further comprises: based on determining that the SIB1 transmission mode indication indicates that the cell provided by the second apparatus supports on-demand SIB1 mode with support of at least one anchor cell, determining an anchor cell of the at least one anchor cell based on information of the anchor cell received from the second apparatus; and acquiring an SIB1 request configuration from the anchor cell.
[0166] In some example embodiments, the method 800 further comprises: transmitting, to the second apparatus, an on-demand SIB1 request according to the SIB1 request configuration acquired from the anchor cell; and receiving the SIB1 from the second apparatus.
[0167] In some example embodiments, the method 800 further comprises: transmitting, to the anchor cell, an on-demand SIB1 request according to the SIB1 request configuration acquired from the anchor cell; and receiving the SIB1 from the anchor cell.
[0168] In some example embodiments, the information of the anchor cell received from the second apparatus comprises at least one of the following: at least one frequency layer associated with the anchor cell, or a cell identifier of the anchor cell.
[0169] In some example embodiments, the first apparatus comprises a terminal device.
[0170] FIG. 9 shows a flowchart of an example method 900 implemented at a second apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 900 will be described from the perspective of the second apparatus 120 in FIG. 1.
[0171] At block 910, the second apparatus generates a SIB1 transmission mode indication for a first apparatus indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell.
[0172] At block 920, the second apparatus transmits the SIB1 transmission mode indication to the first apparatus.
[0173] In some example embodiments, the cell provided by the second apparatus is a network energy saving, NES, cell.
[0174] In some example embodiments, the SIB1 transmission mode indication is transmitted via a master information block, MIB, and / or via a physical broadcast channel, PBCH.
[0175] In some example embodiments, the method 900 further comprises: providing, to the first apparatus, a downlink control channel configuration for the first apparatus to monitor the DCI; and transmitting, to the first apparatus, the SIB1 request configuration via the DCI.
[0176] In some example embodiments, the method 900 further comprises: providing, to the first apparatus, the SIB1 request configuration scheduling; and transmitting, to the first apparatus, the SIB1 request configuration based on the SIB1 request configuration scheduling.
[0177] In some example embodiments, the SIB1 request configuration scheduling is indicated via an index to a pre-defined table with at least one of the following: at least one time allocation, at least one frequency allocation, or at least one modulation and coding scheme, MCS, allocation.
[0178] In some example embodiments, the method 900 further comprises: receiving an on-demand SIB1 request from the first apparatus using the SIB1 request configuration; and transmitting the SIB1 to the first apparatus.
[0179] In some example embodiments, the method 900 further comprises: providing, to the first apparatus, information of at least one anchor cell comprising at least one of the following: at least one frequency layer associated with an anchor cell or a cell identity of the anchor cell.
[0180] In some example embodiments, the method 900 further comprises: receiving an on-demand SIB1 request from the first apparatus using an SIB1 request configuration obtained from the anchor cell; and transmitting the SIB1 to the first apparatus.
[0181] In some example embodiments, the first apparatus comprises a terminal device.
[0182] FIG. 10 shows a flowchart of an example method 1000 implemented at a first apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 1000 will be described from the perspective of the first apparatus 110 in FIG. 1.
[0183] At block 1010, the first apparatus receives, from a target cell, a SIB1 transmission mode indication indicating whether the target cell supports one of:
[0184] broadcasting SIB1 mode.
[0185] on-demanding SIB1 mode without support of an anchor cell. or
[0186] on-demanding SIB1 mode with support of at least one anchor cell.
[0187] At block 1020, the first apparatus applies an interruption time in paging reception associated with an indicated SIB1 transmission mode for a cell reselection.
[0188] In some example embodiments, the method 1000 further comprises: determining whether to perform the cell reselection to the target cell based on the interruption time and a requirement for a maximum interruption in the paging reception.
[0189] In some example embodiments, the interruption time is a time period between the last paging occasion, PO, associated with a serving cell of the first apparatus and the first PO associated with the target cell.
[0190] In some example embodiments, the method 1000 further comprises: in accordance with a determination that the interruption time satisfies the requirement for the maximum interruption in the paging reception, performing the cell reselection to the target cell.
[0191] In some example embodiments, the indicated SIB1 transmission mode is one of the on-demand modes, and wherein the first apparatus is caused to: in accordance with a determination that the interruption time does not satisfy the requirement for the maximum interruption in the paging reception, updating the requirement by increasing the maximum interruption in the paging reception; and in accordance with a determination that the interruption time satisfies the updated requirement, performing the cell reselection to the target cell.
[0192] In some example embodiments, the method 1000 further comprises: in accordance with a determination that the interruption time does not satisfy the requirement for the maximum interruption in the paging reception, considering the target cell as barred.
[0193] In some example embodiments, the SIB1 transmission mode indication is received via a master information block, MIB, and / or via a physical broadcast channel, PBCH.
[0194] In some example embodiments, the first apparatus comprises a terminal device.
[0195] In some example embodiments, the target cell comprises a Network Energy Saving, NES, cell.
[0196] In some example embodiments, a first apparatus capable of performing any of the method 800 (for example, the first apparatus 110 in FIG. 1) may comprise means for performing the respective operations of the method 800. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The first apparatus may be implemented as or included in the first apparatus 110 in FIG. 1.
[0197] In some example embodiments, the first apparatus comprises means for receiving, from a second apparatus, a SIB1 transmission mode indication indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; and means for initiating an acquisition of the SIB1 of the cell based on the SIB1 transmission mode indication.
[0198] In some example embodiments, the cell provided by the second apparatus is a network energy saving, NES, cell.
[0199] In some example embodiments, the SIB1 transmission mode indication is received via a master information block, MIB, and / or via a physical broadcast channel, PBCH.
[0200] In some example embodiments, the first apparatus further comprises: means for based on determining that the SIB1 transmission mode indication indicates that the cell provided by the second apparatus supports on-demand SIB1 mode without support of the anchor cell, initiating the acquisition of the SIB1 according to a configuration received from the second apparatus.
[0201] In some example embodiments, the first apparatus further comprises: means for monitoring downlink control information, DCI, according to the downlink control channel configuration to obtain the SIB1 request configuration; means for transmitting, to the second apparatus, an on-demand SIB1 request according to the obtained SIB1 request configuration; and means for receiving the SIB1 from the second apparatus.
[0202] In some example embodiments, the first apparatus further comprises: means for receiving the SIB1 request configuration according to the SIB1 request configuration scheduling; means for transmitting, to the second apparatus, an on-demand SIB1 request according to the SIB1 request configuration; means for receiving the SIB1 from the second apparatus.
[0203] In some example embodiments, the configuration received from the second apparatus indicates the SIB1 request configuration scheduling via an index to a pre-defined table with at least one of the following: at least one time allocation, at least one frequency allocation, or at least one modulation and coding scheme, MCS, allocation.
[0204] In some example embodiments, the first apparatus further comprises: based on determining that the SIB1 transmission mode indication indicates that the cell provided by the second apparatus supports on-demand SIB1 mode with support of at least one anchor cell, means for determining an anchor cell of the at least one anchor cell based on information of the anchor cell received from the second apparatus; and means for acquiring an SIB1 request configuration from the anchor cell.
[0205] In some example embodiments, the first apparatus further comprises: means for transmitting, to the second apparatus, an on-demand SIB1 request according to the SIB1 request configuration acquired from the anchor cell; and means for receiving the SIB1 from the second apparatus.
[0206] In some example embodiments, the first apparatus further comprises: means for transmitting, to the anchor cell, an on-demand SIB1 request according to the SIB1 request configuration acquired from the anchor cell; and means for receiving the SIB1 from the anchor cell.
[0207] In some example embodiments, the information of the anchor cell received from the second apparatus comprises at least one of the following: at least one frequency layer associated with the anchor cell, or a cell identifier of the anchor cell.
[0208] In some example embodiments, the first apparatus comprises a terminal device.
[0209] In some example embodiments, a second apparatus capable of performing any of the method 900 (for example, the second apparatus 120 in FIG. 1) may comprise means for performing the respective operations of the method 900. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The second apparatus may be implemented as or included in the second apparatus 120 in FIG. 1.
[0210] In some example embodiments, the second apparatus comprises means for generating a SIB1 transmission mode indication for a first apparatus indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell means for transmitting the SIB1 transmission mode indication to the first apparatus.
[0211] In some example embodiments, the cell provided by the second apparatus is a network energy saving, NES, cell.
[0212] In some example embodiments, the SIB1 transmission mode indication is transmitted via a master information block, MIB, and / or via a physical broadcast channel, PBCH.
[0213] In some example embodiments, the second apparatus further comprises: means for providing, to the first apparatus, a downlink control channel configuration for the first apparatus to monitor the DCI; and means for transmitting, to the first apparatus, the SIB1 request configuration via the DCI.
[0214] In some example embodiments, the second apparatus further comprises: means for providing, to the first apparatus, the SIB1 request configuration scheduling; and means for transmitting, to the first apparatus, the SIB1 request configuration based on the SIB1 request configuration scheduling.
[0215] In some example embodiments, the SIB1 request configuration scheduling is indicated via an index to a pre-defined table with at least one of the following: at least one time allocation, at least one frequency allocation, or at least one modulation and coding scheme, MCS, allocation.
[0216] In some example embodiments, the second apparatus further comprises: means for receiving an on-demand SIB1 request from the first apparatus using the SIB1 request configuration; and means for transmitting the SIB1 to the first apparatus.
[0217] In some example embodiments, the second apparatus further comprises: means for providing, to the first apparatus, information of at least one anchor cell comprising at least one of the following: at least one frequency layer associated with an anchor cell or means for a cell identity of the anchor cell.
[0218] In some example embodiments, the second apparatus further comprises: means for receiving an on-demand SIB1 request from the first apparatus using an SIB1 request configuration obtained from the anchor cell; and means for transmitting the SIB1 to the first apparatus.
[0219] In some example embodiments, the first apparatus comprises a terminal device.
[0220] In some example embodiments, a first apparatus capable of performing any of the method 1000 (for example, the first apparatus 110 in FIG. 1) may comprise means for performing the respective operations of the method 1000. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The first apparatus may be implemented as or included in the first apparatus 110 in FIG. 1.
[0221] In some example embodiments, the first apparatus comprises means for receiving, from a target cell, a SIB1 transmission mode indication indicating whether the target cell supports one of: means for broadcasting SIB1 mode; means for on-demanding SIB1 mode without support of an anchor cell; or means for on-demanding SIB1 mode with support of at least one anchor cell; means for applying an interruption time in paging reception associated with an indicated SIB1 transmission mode for a cell reselection.
[0222] In some example embodiments, the first apparatus further comprises means for determining whether to perform the cell reselection to the target cell based on the interruption time and a requirement for a maximum interruption in the paging reception.
[0223] In some example embodiments, the interruption time is a time period between the last paging occasion, PO, associated with a serving cell of the first apparatus and the first PO associated with the target cell.
[0224] In some example embodiments, the first apparatus further comprises means for in accordance with a determination that the interruption time satisfies the requirement for the maximum interruption in the paging reception, performing the cell reselection to the target cell.
[0225] In some example embodiments, the indicated SIB1 transmission mode is one of the on-demand modes, and wherein the first apparatus is caused to: means for in accordance with a determination that the interruption time does not satisfy the requirement for the maximum interruption in the paging reception, updating the requirement by increasing the maximum interruption in the paging reception; and means for in accordance with a determination that the interruption time satisfies the updated requirement, performing the cell reselection to the target cell.
[0226] In some example embodiments, the first apparatus further comprises means for in accordance with a determination that the interruption time does not satisfy the requirement for the maximum interruption in the paging reception, considering the target cell as barred.
[0227] In some example embodiments, the SIB1 transmission mode indication is received via a master information block, MIB, and / or via a physical broadcast channel, PBCH.
[0228] In some example embodiments, the first apparatus comprises a terminal device.
[0229] In some example embodiments, the target cell comprises a Network Energy Saving, NES, cell.
[0230] FIG. 11 is a simplified block diagram of a device 1100 that is suitable for implementing example embodiments of the present disclosure. The device 1100 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 1100 includes one or more processors 1110, one or more memories 1120 coupled to the processor 1110, and one or more communication modules 1140 coupled to the processor 1110.
[0231] The communication module 1140 is for bidirectional communications. The communication module 1140 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 1140 may include at least one antenna.
[0232] The processor 1110 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 1100 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
[0233] The memory 1120 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) 1124, 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) 1122 and other volatile memories that will not last in the power-down duration.
[0234] A computer program 1130 includes computer executable instructions that are executed by the associated processor 1110. The instructions of the program 1130 may include instructions for performing operations / acts of some example embodiments of the present disclosure. The program 1130 may be stored in the memory, e.g., the ROM 1124. The processor 1110 may perform any suitable actions and processing by loading the program 1130 into the RAM 1122.
[0235] The example embodiments of the present disclosure may be implemented by means of the program 1130 so that the device 1100 may perform any process of the disclosure as discussed with reference to FIG. 2 to FIG. 10. The example embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
[0236] In some example embodiments, the program 1130 may be tangibly contained in a computer readable medium which may be included in the device 1100 (such as in the memory 1120) or other storage devices that are accessible by the device 1100. The device 1100 may load the program 1130 from the computer readable medium to the RAM 1122 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) .
[0237] FIG. 12 shows an example of the computer readable medium 1200 which may be in form of CD, DVD or other optical storage disk. The computer readable medium 1200 has the program 1130 stored thereon.
[0238] Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, and other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. Although various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
[0239] Some example embodiments of the present disclosure also provide at least one computer program product tangibly stored on a computer readable medium, such as a non-transitory computer readable medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target physical or virtual processor, to carry out any of the methods as described above. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
[0240] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. The program code may be provided to a processor or controller of a general-purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program code, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
[0241] In the context of the present disclosure, the computer program code or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.
[0242] 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.
[0243] Further, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, although several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Unless explicitly stated, certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, unless explicitly stated, various features that are described in the context of a single embodiment may also be implemented in a plurality of embodiments separately or in any suitable sub-combination.
[0244] 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 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 system information block 1, SIB1, transmission mode indication indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; andinitiate an acquisition of the SIB1 of the cell based on the SIB1 transmission mode indication.2.The first apparatus of claim 1, wherein the cell provided by the second apparatus is a network energy saving, NES, cell.3.The first apparatus of claim 1 or 2, wherein the SIB1 transmission mode indication is received via a master information block, MIB, and / or via a physical broadcast channel, PBCH.4.The first apparatus of any of claims 1-3, wherein the first apparatus is caused to:based on determining that the SIB1 transmission mode indication indicates that the cell provided by the second apparatus supports on-demand SIB1 mode without support of the anchor cell, initiate the acquisition of the SIB1 according to a configuration received from the second apparatus.5.The first apparatus of claim 4, wherein the configuration received from the second apparatus comprises a downlink control channel configuration for monitoring downlink control information, and wherein the first apparatus is caused to:monitor downlink control information, DCI, according to the downlink control channel configuration to obtain the SIB1 request configuration;transmit, to the second apparatus, an on-demand SIB1 request according to the obtained SIB1 request configuration; andreceive the SIB1 from the second apparatus.6.The first apparatus of claim 4, wherein the configuration received from the second apparatus comprises a SIB1 request configuration scheduling, and wherein the first apparatus is caused to:receive the SIB1 request configuration according to the SIB1 request configuration scheduling;transmit, to the second apparatus, an on-demand SIB1 request according to the SIB1 request configuration; andreceive the SIB1 from the second apparatus.7.The first apparatus of claim 6, wherein the configuration received from the second apparatus indicates the SIB1 request configuration scheduling via an index to a pre-defined table with at least one of the following:at least one time allocation,at least one frequency allocation, orat least one modulation and coding scheme, MCS, allocation.8.The first apparatus of any of the claims 1 to 3, wherein the first apparatus is caused to:based on determining that the SIB1 transmission mode indication indicates that the cell provided by the second apparatus supports on-demand SIB1 mode with support of at least one anchor cell,determine an anchor cell of the at least one anchor cell based on information of the anchor cell received from the second apparatus; andacquire a SIB1 request configuration from the anchor cell.9.The first apparatus of claim 8, wherein the first apparatus is caused to:transmit, to the second apparatus, an on-demand SIB1 request according to the SIB1 request configuration acquired from the anchor cell; andreceive the SIB1 from the second apparatus.10.The first apparatus of claim 8, wherein the first apparatus is caused to:transmit, to the anchor cell, an on-demand SIB1 request according to the SIB1 request configuration acquired from the anchor cell; andreceive the SIB1 from the anchor cell.11.The first apparatus of any of the claims 8 to 10, wherein the information of the anchor cell received from the second apparatus comprises at least one of the following:at least one frequency layer associated with the anchor cell, ora cell identifier of the anchor cell.12.The first apparatus of any of claims 1-11, wherein the first apparatus comprises a terminal device.13.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:generate a system information block 1, SIB1, transmission mode indication for a first apparatus indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; andtransmit the SIB1 transmission mode indication to the first apparatus.14.The second apparatus of claim 13, wherein the cell provided by the second apparatus is a network energy saving, NES, cell.15.The second apparatus of claim 13 or 14, wherein the SIB1 transmission mode indication is transmitted via a master information block, MIB, and / or via a physical broadcast channel, PBCH.16.The second apparatus of any of claims 13-15, wherein the second apparatus is caused to:provide, to the first apparatus, a downlink control channel configuration for the first apparatus to monitor the DCI; andtransmit, to the first apparatus, the SIB1 request configuration via the DCI.17.The second apparatus of any of claims 13-15, wherein the second apparatus is caused to:provide, to the first apparatus, the SIB1 request configuration scheduling; andtransmit, to the first apparatus, the SIB1 request configuration based on the SIB1 request configuration scheduling.18.The second apparatus of claim 17, wherein the SIB1 request configuration scheduling is indicated via an index to a pre-defined table with at least one of the following:time allocations,frequency allocations, ormodulation and coding scheme, MCS, allocations.19.The second apparatus of any of claims 13-18, wherein the second apparatus is caused to:receive an on-demand SIB1 request from the first apparatus using the SIB1 request configuration; andtransmit the SIB1 to the first apparatus.20.The second apparatus of any of claims 13-15, wherein the second apparatus is caused to:provide, to the first apparatus, information of at least one anchor cell comprising at least one of the following:at least one frequency layer associated with an anchor cell ora cell identity of the anchor cell.21.The second apparatus of claim 20, wherein the second apparatus is caused to:receive an on-demand SIB1 request from the first apparatus using an SIB1 request configuration obtained from the anchor cell; andtransmit the SIB1 to the first apparatus.22.The second apparatus of any of claims 13-21, wherein the first apparatus comprises a terminal device.23.A method comprising:receiving, from a second apparatus, a system information block 1, SIB1, transmission mode indication indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; andinitiating an acquisition of the SIB1 of the cell based on the SIB1 transmission mode indication.24.A method comprising:generating a system information block 1, SIB1, transmission mode indication for a first apparatus indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; andtransmitting the SIB1 transmission mode indication to the first apparatus.25.A first apparatus comprising:means for receiving, from a second apparatus, a system information block 1, SIB1, transmission mode indication indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; andmeans for initiating an acquisition of the SIB1 of the cell based on the SIB1 transmission mode indication.26.A second apparatus comprising:means for generating a system information block 1, SIB1, transmission mode indication for a first apparatus indicating whether a cell provided by the second apparatus supports on-demand SIB1 mode without support of an anchor cell or on-demand SIB1 mode with support of at least one anchor cell; andmeans for transmitting the SIB1 transmission mode indication to the first apparatus.27.A computer readable medium comprising instructions stored thereon for causing an apparatus at least to perform the method of claim 23 or the method of claim 24.
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