A mobile communication system which can transfer information on the number of packets counted up until then by a base station of a mobile source, to a base station of a mobile target, even when a terminal performs a handover. UE moves to a Target eNode B, but a Source eNode B decides to perform a handover, and the Source eNode B includes information on the number of packets counted up until then in a Handover Request message to the Target eNode B, so as to notify the Target eNode B. After receiving a Handover Confirm message from the UE, the Target eNode B includes information on the number of packets received from the Source eNode B in a Handover Complete message transmitted to a CN Node, so as to notify the CN Node.

In switching a radio base station (SeNB) from a radio base station (SeNB#1) to a radio base station (SeNB#2) in an “Inter-node UP aggregation”, the occurrence of transmission delay of downlink data to a mobile station (UE) is avoided. A mobile communication method according to the present invention includes: stopping, by the radio base station (SeNB#1), scheduling of downlink data to the mobile station (UE), and sending an “SeNB change command” to the mobile station (UE), when receiving an “SeNB change request ack” from the radio base station (SeNB#2); notifying, by the mobile station (UE), a radio base station (MeNB) of at least one of already received downlink data and unreceived downlink data; and resending, by the radio base station (MeNB), the mobile station the downlink data that is not received by the mobile station (UE) in response to the notification.

In switching a radio base station (SeNB) from a radio base station (SeNB#1) to a radio base station (SeNB#2) in an “Inter-node UP aggregation”, the occurrence of transmission delay of downlink data to a mobile station (UE) is avoided. A mobile communication method according to the present invention includes: stopping, by the radio base station (SeNB#1), scheduling of downlink data to the mobile station (UE), and sending an “SeNB change command” to the mobile station (UE), when receiving an “SeNB change request ack” from the radio base station (SeNB#2); notifying, by the mobile station (UE), a radio base station (MeNB) of at least one of already received downlink data and unreceived downlink data; and resending, by the radio base station (MeNB), the mobile station the downlink data that is not received by the mobile station (UE) in response to the notification.

In an embodiment, there is provided a method for support of mobile-terminated communication in an Evolved Packet System, towards a User Equipment UE in idle mode using a power saving mechanism whereby the UE is transiently not reachable, the method includes allowing one or more Downlink DL packets received for the UE to be buffered in a Serving Gateway SGW, upon request, for up to a duration referred to as DL buffering duration.

A satellite communication system that combines the benefits of Geosynchronous Equatorial Orbit (GEO) and Non-geostationary (NGSO) satellite systems into a GEO-NGSO hybrid satellite system. The hybrid system allows for various uses, such as, a NGSO-GEO-NGSO handoff, a GEO-NGSO-GEO handoff, and/or a multi-transport operation utilizing both the GEO and NGSO satellites. Based on the path delay differences of the GEO and NGSO satellites, the system may create a data buffer to ensure no data loss.

A more efficient network can be achieved by leveraging an adaptive dejitter buffer. The dejitter buffer can be dynamically adjusted based off a network data analysis. The dejitter buffer memory/depth of a mobile device can be adjusted in accordance with receiving a delay interruption length and out-of-order packet data associated with another mobile device. Thereafter, the dejitter buffer memory can be filled with voice packet data to decrease a packet delay variation at the mobile device.

The present disclosure relates to a communication technique for converging, with an IoT technology, a 5G communication system for supporting a higher data transmission rate beyond a 4G system, and a system therefor. The present disclosure may be applied to intelligent services, such as smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail, and security and safety related services, on the basis of 5G communication technologies and IoT-related technologies. The present disclosure relates to a method for a terminal in a communication system and a device for performing same, the method comprising the steps of: receiving, from a higher layer device, information indicating packet data convergence protocol (PDCP) data recovery; identifying first data associated with transmission for the PDCP data recovery, from data which have been stored in a signaling radio bearer (SRB) before the information is received; and transmitting the first data to a lower layer.

The present disclosure relates to a communication technique for converging, with an IoT technology, a 5G communication system for supporting a higher data transmission rate beyond a 4G system, and a system therefor. The present disclosure may be applied to intelligent services, such as smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail, and security and safety related services, on the basis of 5G communication technologies and IoT-related technologies. The present disclosure relates to a method for a terminal in a communication system and a device for performing same, the method comprising the steps of: receiving, from a higher layer device, information indicating packet data convergence protocol (PDCP) data recovery; identifying first data associated with transmission for the PDCP data recovery, from data which have been stored in a signaling radio bearer (SRB) before the information is received; and transmitting the first data to a lower layer.

Small base station, micro, femto or pico BTS (PBS) are connected via Un interface to a donor eNB DeNB. In case of a handover from that PBS packets that had not been acknowledged by a UE need to be forwarded to the target base station. Forwarding them via Un and DeNB to the target eNB causes latency and wast radio resources on Un. Thus, the DeNB uses information about the handover to buffer packets and, after being informed by PBS, forward those packets that had not been acknowledged by the UE. This procedure, therefore, saves resources on Un interface and reduces latency. No forwarding of those packets from PBS to DeNB is required. There is provided a method for forwarding data to a wireless terminal. The method is performed by a proxy node. The method comprises receiving data on a link between a core network and a backhaul hub node. The data is addressed to a wireless terminal served by, or handed over from, a serving network node. The method comprises receiving a first indication to forward the data to a target network node of the wireless terminal. The method comprises forwarding the data towards the target network node in response thereto. There is also provided a computer program for such a method and a proxy node configured to perform such a method.

A User Equipment (UE) device operates to directly determine a target small cell for access or handover with the assistance of a macro cell network. The UE directly generates the connection and selects which small cell to access from among a subset of small cells chosen of a set of candidate small cells. The UE is provided dedicated assistance information from the evolved node B (eNB) or macro network device. The dedicated assistance information enables the UE to measure data from the candidate small cells within a heterogeneous network environment. The UE shares the measured data and connects directly to the selected small cell for an access or handover operation.