Method and device for switching a serving cell and method and device supporting on-demand system information message

#The disclosure relates to radio communication and, in particular, to a method and device for switching a serving cell and a method and a device supporting on-demand system information message.

#To meet the demand for wireless data traffic having increased since deployment of 4G communication systems, efforts have been made to develop an improved 5G or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also called a ‘Beyond 4G Network’ or a ‘Post LTE System’. The 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher data rates. To decrease propagation loss of the radio waves and increase the transmission distance, the beamforming, massive multiple-input multiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G communication systems. In addition, in 5G communication systems, development for system network improvement is under way based on advanced small cells, cloud Radio Access Networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like. In the 5G system, Hybrid FSK and QAM Modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as an advanced access technology have been developed.

#The Internet, which is a human centered connectivity network where humans generate and consume information, is now evolving to the Internet of Things (IoT) where distributed entities, such as things, exchange and process information without human intervention. The Internet of Everything (IoE), which is a combination of the IoT technology and the Big Data processing technology through connection with a cloud server, has emerged. As technology elements, such as “sensing technology”, “wired/wireless communication and network infrastructure”, “service interface technology”, and “Security technology” have been demanded for IoT implementation, a sensor network, a Machine-to-Machine (M2M) communication, Machine Type Communication (MTC), and so forth have been recently researched. Such an IoT environment may provide intelligent Internet technology services that create a new value to human life by collecting and analyzing data generated among connected things. IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications.

#The above and/or additional aspects and advantages of the disclosure will become apparent and be more readily appreciated from the following description of embodiments with reference to the accompanying drawings, in which:

#FIG. 1 illustrates a network structure of UE MR-DC in the prior art;

#FIG. 2 illustrates a structure of a base station including a central unit and a distributed unit in the prior art;

#Embodiments of the disclosure will be described in detail hereinafter, and are illustrated in the accompanying drawings throughout which same or similar reference numerals refer to same or similar elements or elements having same or similar functions. The embodiments described with reference to the accompanying drawings are illustrative, merely used for explaining the disclosure and should not be regarded as any limitations thereto.

#It will be appreciated by those skilled in the art that a singular form “a”, “an”, “the” or “said” used herein may include plural referents as well, unless otherwise stated. Further, an expression “comprise/comprising” or “include/including” used herein indicates presence of a corresponding feature, numerical value, step, operation, element and/or component, and does not exclude presence or addition of one or more other features, numerical values, steps, operations, elements, components, and/or combinations thereof. It should be understood that, when a component is referred to as being “connected to” or “coupled to” another component, the component may be directly connected or coupled to the another component or there may be an intermediate component therebetween. In addition, “connected to” or “coupled to” used herein may comprise wireless connection or coupling. An expression “and/or” used herein comprises all or any of one or more associated items and all combinations thereof.

#It will be appreciated by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the disclosure belongs. Further, terms such as those defined in a general dictionary should be interpreted as meanings consistent with those in the context of the related art, and should not be interpreted as ideal or overly formal meanings, unless specifically defined herein.