Enhanced synchronization signal block transmission procedure for network energy saving

Abstract

The present disclosure relates to an apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: Monitor, a plurality of cells, for SSB Detect, from a first cell, a SSB without a PBCH payload. Perform, in response to the detecting the SSB without the PBCH payload and to an on- demand request configuration not stored, the following: Access a second cell within the plurality of cells. Detect, from the second cell, a first SI comprising the on-demand request configuration. Acquire, from the second cell, the first SI and the on-demand request configuration. Store the first SI and the on-demand request configuration. Request, in response to the detecting the SSB and to the on-demand request configuration stored, from the first cell, based on the on- demand request configuration, the PBCH payload.

Description

[0001] ENHANCED SYNCHRONIZATION SIGNAL BLOCK TRANSMISSION

[0002] PROCEDURE FOR NETWORK ENERGY SAVING

[0003] TECHNICAL FIELD

[0004] Various example embodiments described herein relate to the field of wireless communications.

[0005] BACKGROUND

[0006] In wireless communications, carriers broadcasting system information (SI) regularly may be detectable by both radio resource control (RRC) connected user equipment devices (UEs) and UEs that are in RRC idle / inactive state. However, carriers not broadcasting SI regularly such as, e.g., data-only or network energy saving (NES) carriers may not support initial access. Thus, UEs in RRC idle / inactive state may have limited options to detect such a carrier and perform initial access. An enhanced synchronization signal block (SSB) transmission procedure enabling UEs to acquire physical broadcast channel (PBCH) payload to the UE associated with NES carriers along with an on-demand system information transmission would be beneficial.

[0007] SUMMARY

[0008] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

[0009] Example embodiments of the present disclosure may enable improving data transmission or reception. This benefit may be achieved by the features of the independent claims. Further example embodiments are provided in the dependent claims, the detailed description, and the drawings.

[0010] According to a first aspect, an apparatus is disclosed. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, may cause the apparatus to at least: Monitor, a plurality of cells, for synchronization signal block. Detect, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload. Perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following: access a second cell within the plurality of cells; detect, from the second cell, a first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquire, from the second cell, the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and store the first SI, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on- demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell stored, the following: access, using the at least part of the physical broadcast channel payload, the first cell; and request, from the first cell, based on the on-demand request configuration, a second SI.

[0011] According to an example embodiment of the first aspect, the apparatus may be further caused to, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Access the second cell. Detect, from the second cell, the first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell. Acquire, from the second cell, the first system information, the on- demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Store the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell.

[0012] According to an example embodiment of the first aspect, the apparatus may be further caused to: Determine, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on-demand system information transmission.

[0013] According to an example embodiment of the first aspect, the synchronization signal block may comprise one or more synchronization signals. According to an example embodiment of the first aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0014] According to an example embodiment of the first aspect, the first cell may be a network energy saving cell.

[0015] According to an example embodiment of the first aspect, the second cell may be an anchor cell for the network energy saving cell.

[0016] According to a second aspect, a method is disclosed. The method may be computer-implemented. The method may comprise: Monitoring, a plurality of cells, for synchronization signal block. Detecting, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload. Performing, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following: accessing a second cell within the plurality of cells; detecting, from the second cell, a first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquiring, from the second cell, the first system information, the on- demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and storing the first SI, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Performing, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell stored, the following: accessing, using the at least part of the physical broadcast channel payload, the first cell; and requesting, from the first cell, based on the on-demand request configuration, a second system information.

[0017] According to an example embodiment of the second aspect, the method may further comprise, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Accessing the second cell. Detecting, from the second cell, the first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell. Acquiring, from the second cell, the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Storing the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell.

[0018] According to an example embodiment of the second aspect, the method may further comprise: Determining, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on- demand system information transmission.

[0019] According to an example embodiment of the second aspect, the synchronization signal block may comprise one or more synchronization signals.

[0020] According to an example embodiment of the second aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0021] According to an example embodiment of the second aspect, the first cell may be a network energy saving cell.

[0022] According to an example embodiment of the second aspect, the second cell may be an anchor cell for the network energy saving cell.

[0023] According to a third aspect, a computer-readable medium is disclosed. The computer-readable medium may comprise program instructions for causing an apparatus at least to: Monitor, a plurality of cells, for synchronization signal block. Detect, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload. Perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on- demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following: access a second cell within the plurality of cells; detect, from the second cell, a first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquire, from the second cell, the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and store the first SI, the on- demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell stored, the following: access, using the at least part of the physical broadcast channel payload, the first cell; and request, from the first cell, based on the on-demand request configuration, a second SI.

[0024] According to an example embodiment of the third aspect, the computer-readable medium may comprise program instructions for further causing the apparatus to, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Access the second cell. Detect, from the second cell, the first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell. Acquire, from the second cell, the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Store the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell.

[0025] According to an example embodiment of the third aspect, the computer-readable medium may comprise program instructions for further causing the apparatus to: Determine, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on-demand system information transmission.

[0026] According to an example embodiment of the third aspect, the synchronization signal block may comprise one or more synchronization signals.

[0027] According to an example embodiment of the third aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0028] According to an example embodiment of the third aspect, the first cell may be a network energy saving cell.

[0029] According to an example embodiment of the third aspect, the second cell may be an anchor cell for the network energy saving cell.

[0030] According to a fourth aspect, a computer program is disclosed. The computer program may comprise instructions for causing an apparatus at least to: Monitor, a plurality of cells, for synchronization signal block. Detect, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload. Perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following: access a second cell within the plurality of cells; detect, from the second cell, a first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquire, from the second cell, the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and store the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell stored, the following: access, using the at least part of the physical broadcast channel payload, the first cell; and request, from the first cell, based on the on-demand request configuration, a second system information.

[0031] According to an example embodiment of the fourth aspect, the computer program may comprise instructions for further causing the apparatus to, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Access the second cell. Detect, from the second cell, the first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell. Acquire, from the second cell, the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Store the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell.

[0032] According to an example embodiment of the fourth aspect, the computer program may comprise instructions for further causing the apparatus to: Determine, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on-demand system information transmission.

[0033] According to an example embodiment of the fourth aspect, the synchronization signal block may comprise one or more synchronization signals. According to an example embodiment of the fourth aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0034] According to an example embodiment of the fourth aspect, the first cell may be a network energy saving cell.

[0035] According to an example embodiment of the fourth aspect, the second cell may be an anchor cell for the network energy saving cell.

[0036] According to a fifth aspect, an apparatus is disclosed. The apparatus may comprise means for performing at least the following: Monitoring, a plurality of cells, for synchronization signal block. Detecting, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload. Performing, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following: accessing a second cell within the plurality of cells; detecting, from the second cell, a first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquiring, from the second cell, the first system information, the on- demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and storing the first system information, the on- demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Performing, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell stored, the following: accessing, using the at least part of the physical broadcast channel payload, the first cell; and requesting, from the first cell, based on the on-demand request configuration, a second system information.

[0037] According to an example embodiment of the fifth aspect, the apparatus may further comprise means for performing, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Accessing the second cell. Detecting, from the second cell, the first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell. Acquiring, from the second cell, the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell. Storing the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell.

[0038] According to an example embodiment of the fifth aspect, the apparatus may further comprise means for performing: Determining, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on-demand system information transmission.

[0039] According to an example embodiment of the fifth aspect, the synchronization signal block may comprise one or more synchronization signals.

[0040] According to an example embodiment of the fifth aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0041] According to an example embodiment of the fifth aspect, the first cell may be a network energy saving cell.

[0042] According to an example embodiment of the fifth aspect, the second cell may be an anchor cell for the network energy saving cell.

[0043] According to a sixth aspect, an apparatus is disclosed. The apparatus may comprise at least one processor and at least one memory storing instructions that, when executed by the at least one processor, may cause the apparatus to at least: Monitor, a plurality of cells, for synchronization signal block. Detect, from a first cell, a synchronization signal block without a physical broadcast channel payload. Perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration not stored, the following: access a second cell within the plurality of cells; detect, from the second cell, a first system information comprising the on-demand request configuration; acquire, from the second cell, the first system information and the on-demand request configuration; and store the first system information and the on-demand request configuration. Request, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration stored, from the first cell, based on the on-demand request configuration, a physical broadcast channel payload associated with the first cell and a second system information.

[0044] According to an example embodiment of the sixth aspect, the apparatus may be further caused to, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Access the second cell. Detect, from the second cell, the first system information comprising the on-demand request configuration. Acquire, from the second cell, the first system information and the on- demand request configuration. Store the first system information and the on-demand request configuration.

[0045] According to an example embodiment of the sixth aspect, the apparatus may be further caused to: Determine, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on-demand physical broadcast channel payload and system information transmission.

[0046] According to an example embodiment of the sixth aspect, the synchronization signal block may comprise one or more synchronization signals.

[0047] According to an example embodiment of the sixth aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0048] According to an example embodiment of the sixth aspect, the first cell may be a network energy saving cell.

[0049] According to an example embodiment of the sixth aspect, the second cell may be an anchor cell for the network energy saving cell.

[0050] According to a seventh aspect, a method is disclosed. The method may be computer-implemented. The method may comprise: Monitoring, a plurality of cells, for synchronization signal block. Detecting, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload. Performing, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following: accessing a second cell within the plurality of cells; detecting, from the second cell, a first system information comprising the on-demand request configuration; acquiring, from the second cell, the first system information and the on- demand request configuration; and storing the first SI and the on-demand request configuration. Requesting, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration stored, from the first cell, based on the on-demand request configuration, a physical broadcast channel payload associated with the first cell and a second system information.

[0051] According to an example embodiment of the seventh aspect, the method may further comprise, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Accessing the second cell. Detecting, from the second cell, the first system information comprising the on-demand request configuration. Acquiring, from the second cell, the first system information and the on-demand request configuration. Storing the first system information and the on- demand request configuration.

[0052] According to an example embodiment of the seventh aspect, the method may further comprise: Determining, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on- demand physical broadcast channel payload and system information transmission.

[0053] According to an example embodiment of the seventh aspect, the synchronization signal block may comprise one or more synchronization signals.

[0054] According to an example embodiment of the seventh aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0055] According to an example embodiment of the seventh aspect, the first cell may be a network energy saving cell.

[0056] According to an example embodiment of the seventh aspect, the second cell may be an anchor cell for the network energy saving cell.

[0057] According to an eighth aspect, a computer-readable medium is disclosed. The computer-readable medium may comprise program instructions for causing an apparatus at least to: Monitor, a plurality of cells, for synchronization signal block. Detect, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload. Perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on- demand request configuration not stored, the following: access a second cell within the plurality of cells; detect, from the second cell, a first system information comprising the on-demand request configuration; acquire, from the second cell, the first system information and the on-demand request configuration; and store the first system information and the on-demand request configuration. Request, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration stored, from the first cell, based on the on-demand request configuration, a physical broadcast channel payload associated with the first cell and a second system information.

[0058] According to an example embodiment of the eighth aspect, the computer-readable medium may comprise program instructions for further causing the apparatus to, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Access the second cell. Detect, from the second cell, the first system information comprising the on-demand request configuration. Acquire, from the second cell, the first system information and the on-demand request configuration. Store the first system information and the on-demand request configuration.

[0059] According to an example embodiment of the eighth aspect, the computer-readable medium may comprise program instructions for further causing the apparatus to: Determine, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on-demand physical broadcast channel payload and system information transmission.

[0060] According to an example embodiment of the eighth aspect, the synchronization signal block may comprise one or more synchronization signals.

[0061] According to an example embodiment of the eighth aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0062] According to an example embodiment of the eighth aspect, the first cell may be a network energy saving cell.

[0063] According to an example embodiment of the eighth aspect, the second cell may be an anchor cell for the network energy saving cell.

[0064] According to a ninth aspect, a computer program is disclosed. The computer program may comprise instructions for causing an apparatus at least to: Monitor, a plurality of cells, for synchronization signal block. Detect, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload. Perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration not stored, the following: access a second cell within the plurality of cells; detect, from the second cell, a first system information comprising the on-demand request configuration; acquire, from the second cell, the first system information and the on-demand request configuration; and store the first system information and the on- demand request configuration. Request, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on- demand request configuration stored, from the first cell, based on the on-demand request configuration, a physical broadcast channel payload associated with the first cell and a second system information.

[0065] According to an example embodiment of the ninth aspect, the computer program may comprise instructions for further causing the apparatus to, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Access the second cell. Detect, from the second cell, the first system information comprising the on-demand request configuration. Acquire, from the second cell, the first system information and the on-demand configuration. Store the first system information and the on-demand request configuration.

[0066] According to an example embodiment of the ninth aspect, the computer program may comprise instructions for further causing the apparatus to: Determine, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on-demand physical broadcast channel payload and system information transmission.

[0067] According to an example embodiment of the ninth aspect, the synchronization signal block may comprise one or more synchronization signals.

[0068] According to an example embodiment of the ninth aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0069] According to an example embodiment of the ninth aspect, the first cell may be a network energy saving cell.

[0070] According to an example embodiment of the ninth aspect, the second cell may be an anchor cell for the network energy saving cell.

[0071] According to a tenth aspect, an apparatus is disclosed. The apparatus may comprise means for performing at least the following: Monitoring, a plurality of cells, for synchronization signal block. Detecting, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload. Performing, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration not stored, the following: accessing a second cell within the plurality of cells; detecting, from the second cell, a first system information comprising the on- demand request configuration; acquiring, from the second cell, the first system information and the on-demand request configuration; and storing the first system information and the on-demand request configuration. Requesting, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration stored, from the first cell, based on the on-demand request configuration, a physical broadcast channel payload associated with the first cell and a second system information.

[0072] According to an example embodiment of the tenth aspect, the apparatus may further comprise means for performing, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: Accessing the second cell. Detecting, from the second cell, the first system information comprising the on-demand request configuration. Acquiring, from the second cell, the first system information and the on-demand request configuration. Storing the first system information and the on-demand request configuration.

[0073] According to an example embodiment of the tenth aspect, the apparatus may further comprise means for performing: Determining, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on-demand physical broadcast channel payload and system information transmission.

[0074] According to an example embodiment of the tenth aspect, the synchronization signal block may comprise one or more synchronization signals.

[0075] According to an example embodiment of the tenth aspect, the first system information may comprise a first system information block one and the second system information may comprise a second system information block one.

[0076] According to an example embodiment of the tenth aspect, the first cell may be a network energy saving cell. According to an example embodiment of the tenth aspect, the second cell may be an anchor cell for the network energy saving cell.

[0077] Any example embodiment may be combined with one or more other example embodiments. Many of the attendant features will be more readily appreciated as they become better understood by reference to the following detailed description considered in connection with the accompanying drawings.

[0078] DESCRIPTION OF THE DRAWINGS

[0079] The accompanying drawings, which are included to provide a further understanding of the example embodiments and constitute a part of this specification, illustrate example embodiments and together with the description help to understand the example embodiments. In the drawings:

[0080] FIG. 1 illustrates an example or a communication network to which examples disclosed herein may be applied;

[0081] FIG. 2 illustrates example functionalities of an apparatus according to an example embodiment;

[0082] FIG. 3 illustrates example functionalities of an apparatus according to an example embodiment;

[0083] FIG. 4 illustrates a signaling diagram according to an example embodiment;

[0084] FIG. 5 illustrates a signaling diagram according to an example embodiment;

[0085] FIG. 6 illustrates example functionalities of an apparatus according to an example embodiment;

[0086] FIG. 7 illustrates example functionalities of an apparatus according to an example embodiment;

[0087] FIG. 8 illustrates a signaling diagram according to an example embodiment;

[0088] FIG. 9 illustrates a signaling diagram according to an example embodiment; and

[0089] FIG. 10 illustrates a schematic block diagram of an apparatus according to an example embodiment.

[0090] Like references are used to designate like parts in the accompanying drawings.

[0091] DETAILED DESCRIPTION

[0092] Reference will now be made in detail to example embodiments, examples of which are illustrated in the accompanying drawings. The detailed description provided below in connection with the appended drawings is intended as a description of the present examples and is not intended to represent the only forms in which the present example may be constructed or utilized. The description sets forth the functions of the example and the sequence of steps for constructing and operating the example. However, the same or equivalent functions and sequences may be accomplished by different examples.

[0093] Although the specification may refer to “an”, “one”, or “some” embodiment(s) in several locations of the text, this does not necessarily mean that each such reference is to the same embodiment(s), or that the feature may not apply to other embodiments. Single features of different embodiments may also be combined to provide other embodiments. Further, when a particular feature, structure, or characteristic is described in connection of an embodiment, it is within the knowledge of one skilled in the art to apply such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described. Furthermore, words “comprising” and “including” should be understood as not limiting the described embodiments / examples to consist of only those features that have been mentioned and such embodiments / examples may contain also features / structures that have not been specifically mentioned.

[0094] Furthermore, although numerative terminology, such as “first”, “second”, etc., may be used herein to describe various embodiments, elements, or features, it should be understood that these embodiments, elements, or features should not be limited by this numerative terminology. This numerative terminology is used herein only to distinguish one embodiment, element, or feature from another embodiment, element, or feature. For example, a first system information discussed below could be called a second system information, and vice versa, without departing from the teachings of the present disclosure.

[0095] For the purposes of the present disclosure, the phrases “at least one of A or B”, “at least one of A and B”, and “A and / or B” means (A), (B), or (A and B). For the purposes of the present disclosure, the phrase “A, B, and / or C” means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B, and C).

[0096] Embodiments described may be implemented in a communication network, such as any of the following radio access technologies (RATs): World-wide Interoperability for Micro-wave Access (WiMAX), Global System for Mobile communications (GSM, 2G), GSM EDGE radio access Network (GERAN), General Packet Radio Service (GRPS), Universal Mobile Telecommunication System (UMTS, 3G) based on basic wideband-code division multiple access (W-CDMA), high-speed packet access (HSPA), Long Term Evolution (LTE), LTE-Advanced, and enhanced LTE (eLTE), 5G (also called NR), or any future RAT such as 6G. Moreover, communication within the communication network 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), and / or Discrete Fourier Transform spread OFDM (DFT-s-OFDM).

[0097] As used herein, the term “network device” or “network node” refers to a node in a communication network via which user equipment may access the network and / or which is capable of controlling radio communication and man-aging radio resources within a cell. The network node or network device may be referred to as a base station (BS), an access point (AP) or an access node. The network device may be, depending on the applied technology, 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 head (RH), a remote radio head (RRH), a relay, an Integrated Access and Backhaul (IAB) node, a low power node, 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, or an aircraft network device.

[0098] Moreover, in connection of split radio access network (RAN), the network device refers to a centralized unit (CU) of a base station and / or a distributed unit (DU) of a base station. An interface between CU and DU may be referred to as an Fl interface in NR. In the split RAN architecture, node operations may be carried out, at least partly, in the central / centralized unit, CU, (e.g. server, host or node) operationally coupled to the DU, (e.g. a radio head / node). One CU may control one or more DUs, acting at least as transmit / receive (Tx / Rx) nodes. In some embodiments, the DUs may comprise, e.g., a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer, whereas the CU may comprise the layers above RLC layer, such as a packet data convergence protocol (PDCP) layer, a radio resource control (RRC) layer, and an internet protocol (IP) layer. Other functional splits are possible too. In practice, any processing task may be performed in either the CU or the DU and the boundary where the responsibility is shifted between the CU and the DU may depend on the applied implementation.

[0099] The term “terminal device” refers to any end device that may be capable of wireless communication. By way of example, a terminal device may be referred to as a communication device, user equipment (UE), a Subscriber Station (SS), or a Mobile Station (MS). The terminal device may include 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 de-vices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, USB dongles, an Internet of Things (loT) device, a watch or other wearable device, 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.

[0100] A term “resource”, as used herein, may refer to radio resources in time domain, in frequency domain, in space domain, and / or in code domain. Some examples of resources include e.g. a physical resource block (PRB), a radio frame, a subframe, a time slot, a subband, a frequency region, a sub-carrier, a beam, etc. The term “transmission” and / or “reception” may refer to wirelessly transmitting and / or receiving via a wireless propagation channel on radio re-sources.

[0101] FIG. 1 depicts examples of simplified system architectures only showing some elements and functional entities, all being logical units, whose implementation may differ from what is shown. The connections shown in FIG. 1 are logical connections; the actual physical connections may be different. It is apparent to a person skilled in the art that the system typically comprises also other functions and structures than those shown in FIG. 1.

[0102] The embodiments are not, however, restricted to the system given as an example but a person skilled in the art may apply the solution to other communication systems provided with necessary properties.

[0103] FIG. 1 illustrates an example of a communication network to which examples disclosed herein may be applied. The communication network or a cellular communication network may comprise a network node 110 providing one or more cells, such as cell 100, and a network node 112 providing one or more other cells, such as cell 102. In one example, the node 110, 112 may be an access node such as (e / g)NodeB providing or serving devices in a cell. In one example, the node 102 may be a non-3GPP access node. It should be appreciated that (e / g)NodeBs or their functionalities may be implemented by using any node, host, server or access point etc. entity suitable for such a usage. Each cell 100, 102 may be, e.g., a macro cell, a micro cell, femto, or a pico cell, for example. The cell may define a coverage area or a service area of the corresponding access node.

[0104] The network node 110 may provide a user equipment (UE) 120 (one or more UEs) with wireless access to the communication network. The wireless access may comprise downlink (DL) communication from the network node to the UE 120 and uplink (UL) communication from the UE 120 to the network node. Examples of uplink channels comprise physical uplink control channel (PUCCH) for transmitting control information and physical uplink shared channel (PUSCH) for transmitting data towards the network. Examples of downlink channels comprise physical downlink control channel (PDCCH) for transmitting control information and physical downlink shared channel (PDSCH) for transmitting data towards the user equipment.

[0105] There may be a plurality of UEs 120, 122 in the system. Each of them may be served by the same or by different network nodes 110, 112. UE may be configured with dual connectivity (DC), wherein the UE, e.g. UE 120, may be connected to multiple network nodes 110, 112. The UEs 120, 122 may communicate with each other, in case device-to-device (D2D) communication interface is established between them via a so- called sidelink (SL). Such D2D communications may be referred to as machine-to- machine, peer-to-peer (P2P) communications, or vehicle-to-vehicle (V2V), for example.

[0106] In the case of multiple network nodes in the communication network, the network nodes may be connected to each other via an interface. LTE specifications call such an interface as X2 interface. An interface between an LTE node and a 5G node, or between two 5G nodes may be called Xn interface.

[0107] The network nodes 110 and 112 may be further connected via another interface to a core network 116 of the communication network. The LTE specifications specify the core network as an evolved packet core (EPC), and the core network may comprise e.g. a mobility management entity (MME) and a gateway node. The MME may handle mobility of terminal devices in a tracking area encompassing a plurality of cells and handle signaling connections between the terminal devices and the core network. The gateway node may handle data routing in the core network and to / from the terminal devices. The 5G specifications specify the core network as a 5G core (5GC). The 5G core may comprise e.g. an access and mobility management function (AMF) and a user plane function / gateway (UPF) and other functions. The AMF may handle termination of non-access stratum (NAS) signaling, NAS ciphering & integrity protection, registration management, connection management, mobility management, access authentication and authorization, security context management. The UPF node may support packet routing and forwarding, packet inspection and quality of service (QoS) handling, for example.

[0108] In 6G networks, and beyond, it is envisaged that enabling UEs to transmit requests for on-demand physical broadcast channel payload and system information requests to network energy saving (NES) cells may enable UEs in RRC idle or RRC inactive state to switch to NES cells. An apparatus configured to detect from a first cell (NES cell) a synchronization signal block (SSB) without physical broadcast channel (PBCH) payload may be configured to receive on-demand request configuration from a second cell (anchor cell) to request physical broadcast channel payload and system information from the first cell, e.g., as described below with FIG. 2 to 9. In the context of this specification, the on-demand request configuration may be understood as a wake-up signal configuration enabling the apparatus to camp on the first cell by requesting system information and optionally at least part of the PBCH payload associated with the first cell. The on-demand request configuration may comprise at least time and frequency resources and physical cell identifier (PCI) associated with the first cell, which the apparatus may use in order to transmit to the first cell a request for on-demand PBCH payload and system information (SI) transmission.

[0109] FIG. 2 illustrates example functionalities of an apparatus configured to receive the on-demand request configuration. The apparatus may be a user device.

[0110] Referring to FIG. 2, a plurality of cells are monitored in operation 201 for synchronization signal block. In an example embodiment, the apparatus is in RRC idle state. In an example embodiment the apparatus is in RRC inactive state. A system synchronization block (SSB) without a physical broadcast channel payload is detected in operation 202, from a first cell within the plurality of cells. In an example embodiment, the first cell is a network energy saving (NES) cell. Broadcasting the SSB without the PBCH payload may consume less energy. Downlink transmission of the SSB without the full PBCH payload may save network energy consumption expanded over up to 3 x 8 = 24 orthogonal frequency division multiplexing (OFDM) symbols in a cell with 8 SSB beams, since the PBCH payload spans 3 ODFM symbols. In an example embodiment, it is determined based on the detected SSB that the first cell is configured to on-demand transmission of physical broadcast channel payload and system information. In an example embodiment, the SSB comprises one or more synchronization signals such as, e.g., a primary synchronization signal (PSS) and / or a secondary synchronization signal (SSS).

[0111] Referring to FIG. 2, it is determined in operation 203 whether an on-demand (OD) request configuration and at least part of a physical broadcast channel payload associated with the first cell are stored. If the OD request configuration and at least part of a PBCH payload associated with the first cell is not stored (operation 203 : no), the following steps are performed in operations 204 to 207. A second cell within the plurality of cells is accessed in operation 204. In an example embodiment, the second cell is an anchor cell for the network energy saving cell.

[0112] Referring to FIG. 2, a first system information (SI) comprising the OD request configuration and the at least part of the PBCH payload associated with the first cell is detected in operation 205, from the second cell. In an example embodiment, the first SI comprises a first system information block (SIB). In an example embodiment, the first SI comprises a first system information block one (SIB1). In an example embodiment, the first SI comprises a first radio resource control (RRC) release message. In an example embodiment, the first SI comprises a first radio resource control reconfiguration message. The additional energy consumption imposed to the second cell for the transmission of the PBCH payload associated with the first cell may be a negligible additional energy cost, since it may be multiplexed with other transmissions performed by the second cell. In an example embodiment, the at least part of the PBCH payload may comprise the full PBCH associated with the first cell, comprising at least a master information block (MIB) (24 bits) and timing related bits (8 bits) associated with the first cell. In an example embodiment, the at least part of the PBCH payload may comprise partially the PBCH associated with the first cell. For example, if the second cell and the first cell comprise the same system frame number (SFN) and slot numbering, the timing related bits may be omitted. Then SFN and slot numbering associated with the second cell may be applied for the first cell. In an example embodiment, the PBCH payload associated with the first cell may not comprise cyclic redundancy check (CRC) bits (24 bits), because the CRC bits serve for channel coding. The coding used for the first SI may be used instead for the PBCH payload. Acquiring the at least part of the PBCH payload associated with the first cell from the second cell may decrease delay for soft combining process of multiple instances of PBCH that need to be received under weak coverage conditions.

[0113] Referring to FIG. 2, the first SI, the on-demand request configuration, and the at least part of the PBCH payload associated with the first cell are acquired in operation 206. The first SI, the on-demand request configuration, and the at least part of the PBCH payload associated with the first cell are stored in operation 207. Then the process continues in operation 203 by determining whether the OD request configuration and the at least part of the PBCH associated with the first cell are stored.

[0114] Referring to FIG. 2, if the OD request configuration and at least part of a PBCH associated with the first cell are stored (operation 203: yes), the following steps are performed in operations 208 and 209. The first cell is accessed in operation 208 using the at least part of the PBCH payload stored. A second system information (SI) is requested in operation 209 from the first cell, based on the OD request configuration. In an example embodiment, the second SI comprises a second system information block (SIB). In an example embodiment, the second SI comprises a second system information block one (SIB1). In an example embodiment, the second SI comprises a second radio resource control (RRC) release message. In an example embodiment, the second SI comprises a second radio resource control reconfiguration message. In an example embodiment, the at least part of the PBCH payload comprises only partially the PBCH associated with the first cell, and other parts of the PBCH payload are requested from the first cell together with the second SI.

[0115] FIG. 3 illustrates further example functionalities of an apparatus configured to acquire the on-demand request configuration. The OD request configuration may be acquired prior to detecting the synchronization signal block without the physical broadcast channel payload. The apparatus may be a user device. The functionalities illustrated in FIG. 3 are assumed to be performed within operation 201 in FIG. 2, i.e., while monitoring for the SSB. Referring to FIG. 3, the second cell within the plurality of cells is accessed in operation 301. The first system information (SI) comprising the OD request configuration and the at least part of the PBCH payload associated with the first cell is detected in operation 302, from the second cell. The first SI, the on-demand request configuration, and the at least part of the PBCH payload associated with the first cell are acquired in operation 303. The first SI, the on-demand request configuration, and the at least part of the PBCH payload associated with the first cell are stored in operation 304.

[0116] FIG. 4 and 5 illustrate signaling diagrams according to examples of information exchange in a communication network configured to enable system information acquired from the second cell comprising on-demand request configuration and PBCH payload associated with the first cell. The term “UE” is used for a user equipment device configured to prioritize downlink monitoring. The term “1st cell” is used for the first cell 102 and the term “2nd cell” is used for the second cell 100. Each cell may be, e.g., a macro cell, a micro cell, femto, or a pico cell. A cell may define a coverage area or a service area of a corresponding access node.

[0117] Referring to FIG. 4, the UE is in RRC idle / inactive state and camping on the 2nd cell (block 4-1). The 2nd cell broadcasts (message 4-2) a system information (a first system information) such as, e.g., a system information block one (SIB1), comprising an on-demand request configuration and a full or a part of a physical broadcast channel payload associated with the 1st cell. The UE detects, acquires, and stores in block 4-3 the SI. The UE acquires and stores in block 4-4 the on-demand request configuration. The UE acquires and stores in block 4-5 the full or the part of the physical broadcast channel payload associated with the 1st cell. The UE assumes in block 4-6 that the 1st cell follows on-demand PBCH payload and SI request operation. The 1st cell broadcasts (message 4-7) a synchronization signal block without a physical broadcast channel payload. The UE detects in block 4-8 synchronization signals comprised in the SSB. The UE does not detect PBCH payload associated with the 1st cell since it is not comprised in the SSB. However, the full or the part of PBCH payload associated with the 1st cell is already stored within the UE. The UE switches in block 4-9 to 1st cell using the stored PBCH payload. The UE applies in block 4-10 an on-demand SI request procedure by, e.g., requesting a second system information (SI), such as, e.g., a second SIB1, from the 1st cell. In an example embodiment, the stored PBCH payload comprises only the part of PBCH payload associated with the first cell, and the UE requests other parts of the PBCH payload from the 1st cell together with the second SI.

[0118] Referring to FIG. 5, the UE is in RRC idle / inactive state (block 5-1). The 1st cell broadcasts (message 5-2) a synchronization signal block without a physical broadcast channel payload. The UE detects in block 5-3 synchronization signals comprised in the SSB. The UE does not detect PBCH payload associated with the 1st cell since it is not comprised in the SSB. The UE assumes in block 5-4 that the 1st cell follows on-demand PBCH payload and SI request operation. The UE switches in block 5-5 to the 2nd cell for acquiring a system information such as, e.g., a SIB1, comprising an on-demand request configuration and a full or a part of the PBCH payload associated with the 1st cell. The 2nd cell broadcasts (message 5-6) the SI (the first SI) comprising the on- demand request configuration and the full or the part of a physical broadcast channel payload associated with the 1st cell. The UE detects, acquires, and stores in block 5-7 the SI. The UE acquires and stores in block 5-8 the on-demand request configuration. The UE acquires and stores in block 5-9 the full or the part of the physical broadcast channel payload associated with the 1st cell. The UE switches in block 5-10 to 1st cell using the stored PBCH payload. The UE applies in block 5-11 an on-demand SI request procedure by, e.g., requesting a second system information, such as, e.g., a second SIB1, from the 1st cell. In an example embodiment, the stored PBCH payload comprises only the part of PBCH payload associated with the first cell, and the UE requests other parts of the PBCH payload from the 1st cell together with the second SI.

[0119] FIG. 6 illustrates example functionalities of an apparatus configured to receive on- demand request configuration. The apparatus may be a user device.

[0120] Referring to FIG. 6, a plurality of cells are monitored in operation 601 for synchronization signal block. In an example embodiment, the apparatus is in RRC idle state. In an example embodiment the apparatus is in RRC inactive state. A system synchronization block without a physical broadcast channel payload is detected in operation 602, from a first cell within the plurality of cells. In an example embodiment, the first cell is a network energy saving (NES) cell. Broadcasting the SSB without the PBCH payload may consume less energy. Downlink transmission of the SSB without the full PBCH payload may save network energy consumption expanded over up to 3 x 8 = 24 orthogonal frequency division multiplexing (OFDM) symbols in a cell with 8 SSB beams, since the PBCH payload spans 3 ODFM symbols. In an example embodiment, it is determined based on the detected SSB that the first cell is configured to on-demand transmission of physical broadcast channel payload and system information. In an example embodiment, the SSB comprises one or more synchronization signals such as, e.g., a primary synchronization signal (PSS) and / or a secondary synchronization signal (SSS).

[0121] Referring to FIG. 6, it is determined in operation 603 whether an on-demand (OD) request configuration is stored. If the OD request configuration is not stored (operation 603: no), the following steps are performed in operations 604 to 607. A second cell within the plurality of cells is accessed in operation 604. In an example embodiment, the second cell is an anchor cell for the network energy saving cell. A first system information (SI) comprising the OD request configuration is detected in operation 605, from the second cell. In an example embodiment, the first SI comprises a first system information block (SIB). In an example embodiment, the first SI comprises a first system information block one (SIB1). In an example embodiment, the first SI comprises a first radio resource control (RRC) release message. In an example embodiment, the first SI comprises a first radio resource control reconfiguration message. The first SI and the on- demand request configuration are acquired in operation 606. The first SI and the on- demand request configuration are stored in operation 607. Then the process continues in operation 603 by determining whether the OD request configuration is stored.

[0122] Referring to FIG. 6, if the on-demand request configuration is stored (operation 603: yes), the PBCH payload associated with the first cell and a second system information (SI) are requested in operation 608 from the first cell, based on the on- demand request configuration. In an example embodiment, the second SI comprises a second system information block (SIB). In an example embodiment, the second SI comprises a second system information block one (SIB1). In an example embodiment, the second SI comprises a second radio resource control (RRC) release message. In an example embodiment, the second SI comprises a second radio resource control reconfiguration message. In an example embodiment, the second cell may be configured to provide the PBCH payload associated with the first cell and the second system information for the first cell. In an example embodiment, the PBCH payload associated with the first cell and the second system information are requested in operation 608 from the second cell, based on the on-demand request configuration. FIG. 7 illustrates further example functionalities of an apparatus configured to acquire the on-demand request configuration. The on-demand request configuration may be acquired prior to detecting the synchronization signal block without the physical broadcast channel payload. The apparatus may be a user equipment device. The functionalities illustrated in FIG. 7 are assumed to be performed within operation 601 in FIG. 6, i.e., while monitoring for the SSB.

[0123] Referring to FIG. 7, the second cell within the plurality of cells is accessed in operation 701. The first system information (SI) comprising the on-demand request configuration is detected in operation 702, from the second cell. The first SI and the on- demand request configuration are acquired in operation 703. The first SI and the on- demand request configuration are stored in operation 704.

[0124] FIG. 8 and 9 illustrate signaling diagrams according to examples of information exchange in a communication network configured to enable system information acquired from the second cell comprising on-demand request configuration. The term “UE” is used for a user device configured to prioritize downlink monitoring. The term “1st cell” is used for the first cell 102 and the term “2nd cell” is used for the second cell 100. Each cell may be, e.g., a macro cell, a micro cell, femto, or a pico cell. A cell may define a coverage area or a service area of a corresponding access node.

[0125] Referring to FIG. 8, the UE is in RRC idle / inactive state and camping on the 2nd cell (block 8-1). The 2nd cell broadcasts (message 8-2) a system information (a first system information) such as, e.g., a system information block one (SIB1), comprising an on-demand request configuration. The UE detects, acquires, and stores in block 8-3 the SI. The UE acquires and stores in block 8-4 the on-demand request configuration. The UE assumes in block 8-5 that the 1st cell follows on-demand SI and PBCH payload request operation. The 1st cell broadcasts (message 8-6) a synchronization signal block without a physical broadcast channel payload. The UE detects in block 8-7 synchronization signals comprised in the SSB. The UE does not detect PBCH payload associated with the 1st cell since it is not comprised in the SSB. The UE applies in block 8-8 an on-demand PBCH payload and SI request procedure by, e.g., requesting from the 1st cell the PBCH payload associated with the 1st cell and a second system information (SI), such as, e.g., a second SIB1. In an example embodiment, the PBCH payload associated with the 1st cell and the second SI are requested in block 8-8 from the 2nd cell based on the on-demand request configuration. Then the UE acquires and stores the PBCH payload associated with the 1 st cell and the second SI for the 1 st cell, and switches to the 1st cell with the stored PBCH payload and the second SI.

[0126] Referring to FIG. 9, the UE is in RRC idle / inactive state (block 9-1). The 1st cell broadcasts (message 9-2) a synchronization signal block without a physical broadcast channel payload. The UE detects in block 9-3 synchronization signals comprised in the SSB. The UE does not detect PBCH payload associated with the 1st cell since it is not comprised in the SSB. The UE assumes in block 9-4 that the 1st cell follows on-demand SI and PBCH payload request operation. The UE switches in block 9-5 to the 2nd cell for acquiring a system information such as, e.g., a SIB1, comprising an on-demand request configuration. The 2nd cell broadcasts (message 9-6) the SI (the first SI) comprising the on-demand request configuration. The UE detects, acquires, and stores in block 9-7 the SI. The UE acquires and stores in block 9-8 the on-demand request configuration. The UE applies in block 9-9 an on-demand SI and PBCH payload request procedure by, e.g., requesting from the 1st cell the PBCH payload associated with the 1st cell and a second system information (SI), such as, e.g., a second SIB1. In an example embodiment, the PBCH payload associated with the 1st cell and the second SI are requested in block 9-9 from the 2nd cell based on the on-demand request configuration. Then the UE acquires and stores the PBCH payload associated with the 1st cell and the second SI for the 1st cell, and switches to the 1st cell with the stored PBCH payload and the second SI.

[0127] FIG. 10 illustrates an example embodiment of an apparatus 1000, which may be an apparatus such as, or comprised in, a user (equipment) device. The apparatus 1000 may correspond to any of the user devices 120, 122 of FIG. 1. The apparatus may also be called a subscriber unit, mobile station, remote terminal, access terminal, user terminal, terminal device, user equipment (UE), vehicle, or any electric device. Although the apparatus 1000 is illustrated as a single device, it is appreciated that, wherever applicable, functions of the apparatus 1000 may be distributed to a plurality of devices.

[0128] The apparatus 1000 may comprise at least one processor 1002. The at least one processor 1002 may comprise, for example, one or more of various processing devices or processor circuitry, such as for example a co-processor, a microprocessor, a controller, a digital signal processor (DSP), a processing circuitry with or without an accompanying DSP, or various other processing devices including integrated circuits such as, for example, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a microcontroller unit (MCU), a hardware accelerator, a special-purpose computer chip, or the like.

[0129] The apparatus 1000 may further comprise at least one memory 1004. The at least one memory 1004 may be configured to store, for example, computer program code or the like, for example operating system software and application software. The at least one memory 1004 may comprise one or more volatile memory devices, one or more nonvolatile memory devices, and / or a combination thereof. For example, the at least one memory 1004 may be embodied as magnetic storage devices (such as hard disk drives, floppy disks, magnetic tapes, etc.), optical magnetic storage devices, or semiconductor memories (such as mask ROM, PROM (programmable ROM), EPROM (erasable PROM), flash ROM, RAM (random access memory), etc.).

[0130] The apparatus 1000 may further comprise a communication interface 708 configured to enable the apparatus 1000 to transmit and / or receive information to / from other devices. In one example, the apparatus 1000 may use the communication interface 1008 to transmit or receive signaling information and data in accordance with at least one data communication or cellular communication protocol. The communication interface 1008 may comprise, or be configured to be coupled to, at least one antenna to transmit and / or receive radio frequency signals. One or more of the various types of connections may be also implemented as separate communication interfaces, which may be coupled or configured to be coupled to one or more of a plurality of antennas. The communication interface 1008 may comprise a receiver, a transmitter, or a transceiver.

[0131] Referring to FIG. 10, when the apparatus 1000 is configured to implement some functionality, some component and / or components of the apparatus 1000, such as for example the at least one processor 1002 and / or the at least one memory 1004, may be configured to implement this functionality. Furthermore, when the at least one processor 1002 is configured to implement some functionality, this functionality may be implemented using program code 1006 comprised, for example, in the at least one memory 1004.

[0132] The functionalities described herein may be performed, at least in part, by one or more computer program product components such as for example software components. According to an example embodiment, the apparatus 1000 may comprise a processor or processor circuitry, such as for example a microcontroller, configured by the program code when executed to execute the embodiments of the operations and functionality described. The program code 1006 is provided as an example of instructions which, when executed by the at least one processor 1002, cause performance of apparatus. Alternatively, or additionally, the functionality described herein can be performed, at least in part, by one or more hardware logic components. For example, and without limitation, illustrative types of hardware logic components that can be used include Field-programmable Gate Arrays (FPGAs), application-specific Integrated Circuits (ASICs), application-specific Standard Products (ASSPs), System-on-a-chip systems (SOCs), Complex Programmable Logic Devices (CPLDs), Graphics Processing Units (GPUs).

[0133] The apparatus 1000 may be configured to perform or cause performance of any aspect of the method(s) described herein. Further, a computer program may comprise instructions for causing, when executed, an apparatus to perform any aspect of the method(s) described herein. The computer program may be stored on a computer- readable medium. Further, the apparatus 1000 may comprise means for performing any aspect of the method(s) described herein. In one example, the means may comprise the at least one processor 1002, the at least one memory 1004 including the program code 1006, (instructions) configured to, when executed by the at least one processor 1002, cause the apparatus 1000 to perform the method(s). In general, computer program instructions may be executed on means providing generic processing functions. The method(s) may be thus computer-implemented, for example, algorithm(s) executable by the generic processing functions, an example of which is the at least one processor 1002. The means may comprise transmission and / or reception means, for example one or more radio transmitters or receivers, which may be coupled or be configured to be coupled to one or more antennas, or transmitter(s) or receiver(s) of a wired communication interface.

[0134] As used in this application, the term ‘circuitry’ refers to all of the following: (a) hardware-only circuit implementations, such as implementations in only analog and / or digital circuitry, and (b) combinations of circuits and soft-ware (and / or firmware), such as (as applicable): (i) a combination of processor(s) or (ii) portions of processor(s) / software including digital signal processor(s), software, and memory(ies) that work together to cause an apparatus to perform various functions, and (T) circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present. This definition of ‘circuitry’ applies to all uses of this term in this application. As a further example, as used in this application, the term ‘circuitry’ would also cover an implementation of merely a processor (or multiple processors) or a portion of a processor and its (or their) accompanying software and / or firmware. The term ‘circuitry’ would also cover, for example and if applicable to the particular element, a baseband integrated circuit or applications processor integrated circuit for a mobile device or a similar integrated circuit in a sensor, a cellular network device, or another network device.

[0135] Although the subject matter has been described in language specific to structural features and / or acts, it is to be understood that the subject matter 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 embodiments of implementing the claims and other equivalent features and acts are intended to be within the scope of the claims.

[0136] It will be understood that the benefits and advantages described above may relate to one example embodiment or may relate to several example embodiments. The example embodiments are not limited to those that solve any or all of the stated problems or those that have any or all of the stated benefits and advantages. It will further be understood that reference to 'an' item may refer to one or more of those items.

[0137] The steps or operations of the methods described herein may be carried out in any suitable order, or simultaneously where appropriate. Additionally, individual blocks may be deleted from any of the methods without departing from the scope of the subject matter described herein. Aspects of any of the example embodiments described above may be combined with aspects of any of the other example embodiments described to form further example embodiments without losing the effect sought.

[0138] It will be understood that the above description is given by way of example embodiments only and that various modifications may be made by those skilled in the art. The above specification, example embodiments and data provide a complete description of the structure and use of exemplary embodiments. Although various example embodiments have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous alterations to the disclosed example embodiments without departing from scope of this specification.

Claims

CLAIMS1. An apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: monitor, a plurality of cells, for synchronization signal block; detect, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload; perform, in response to detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following: access a second cell within the plurality of cells; detect, from the second cell, a first system information comprising the on- demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquire, from the second cell, the first system information; and store the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and perform, in response to detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell stored, the following: access, using the at least part of the physical broadcast channel payload, the first cell; and request, from the first cell, based on the on-demand request configuration, a second system information.

2. An apparatus according to claim 1, wherein the apparatus is further caused to, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: access the second cell;detect, from the second cell, the first system information comprising the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquire, from the second cell, the first system information; and store the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell.

3. An apparatus according to claim 1 or 2, wherein the apparatus is further caused to: determine, based on the detected synchronization signal block without the physical broadcast channel payload, the first cell being configured to on-demand system information transmission.

4. An apparatus according to any of the preceding claims, wherein the synchronization signal block comprises one or more synchronization signals.

5. An apparatus according to any of the preceding claims, wherein the first system information comprises a first system information block one and the second system information comprises a second system information block one.

6. An apparatus according to any of the preceding claims, wherein the first cell is a network energy saving cell.

7. An apparatus according to claim 6, wherein the second cell is an anchor cell for the network energy saving cell.

8. A method comprising: monitoring, a plurality of cells, for synchronization signal block; detecting, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload; performing, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following:accessing a second cell within the plurality of cells; detecting, from the second cell, a first system information comprising the on- demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquiring, from the second cell, the first system information; and storing the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and performing, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell stored, the following: accessing, using the at least part of the physical broadcast channel payload, the first cell; and requesting, from the first cell, based on the on-demand request configuration, a second system information.

9. A method according to claim 8, further comprising, prior to the detecting the synchronization signal block without the physical broadcast channel payload from the first cell: accessing the second cell; detecting, from the second cell, the first system information comprising the on- demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquiring, from the second cell, the first system information; and storing the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell.

10. A computer-readable medium comprising program instructions for causing an apparatus to at least: monitor, a plurality of cells, for synchronization signal block; detect, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload;perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following: access a second cell within the plurality of cells; detect, from the second cell, a first system information comprising the on- demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquire, from the second cell, the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and store the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell stored, the following: access, using the at least part of the physical broadcast channel payload, the first cell; and request, from the first cell, based on the on-demand request configuration, a second system information.

11. A computer program comprising instructions for causing an apparatus to at least: monitor, a plurality of cells, for synchronization signal block; detect, from a first cell within the plurality of cells, a synchronization signal block without a physical broadcast channel payload; perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to an on-demand request configuration and at least part of the physical broadcast channel payload associated with the first cell not stored, the following: access a second cell within the plurality of cells;detect, from the second cell, a first system information comprising the on- demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell; acquire, from the second cell, the first system information; and store the first system information, the on-demand request configuration, and the at least part of the physical broadcast channel payload associated with the first cell; and perform, in response to the detecting the synchronization signal block without the physical broadcast channel payload and in response to the on-demand request configuration and the at least part of the physical broadcast channel payload associated with the first cell stored, the following: access, using the at least part of the physical broadcast channel payload, the first cell; and request, from the first cell, based on the on-demand request configuration, a second system information.

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