Performance optimization of a mobile communications network is disclosed where groups of wireless communication devices are moving together at high speed, e.g. on-board high speed trains. The performance optimization is provided via a multiple layered access context in terms of a low frequency layer serving as a large coverage cell overlapping with multiple smaller cells with higher performance in a high frequency layer.

Generally, this disclosure provides devices, systems and methods for performance monitoring of WLAN data traffic offloading in wireless cellular networks. A wireless local area network (WLAN) access point (AP) may include a performance measurement module to measure the number of User Equipment (UEs) connected to the WLAN AP for data traffic offload and further to measure packet throughput from the UEs to the WLAN AP; a measurement granularity timer to trigger the performance measurement module to perform the measurements; a performance report generation module to generate a WLAN report based on the measurements provided from the performance measurement module; and a performance report timer to trigger the performance report generation module to generate the WLAN report.

This invention provides a method, system and apparatus for controlling mobility on a wireless network, which includes retrieving a network mobility preference, the network mobility preference indicating a level of mobility service for the mobile station, the level of mobility service indicating the extent to which the mobile station can handoff among base stations of the wireless network, and establishing a level of mobility service for the mobile station based on the retrieved network mobility preference. The method and apparatus may further include determining the level of mobility service for the mobile station to be fully or partially restricted based on the mobility preference.

Embodiments provide a user equipment handover method, and a device. In embodiments of the present invention, when a handover is to be performed, user equipment may send first information that is used to request a handover, and then a destination network device may allocate a first uplink resource to the user equipment.

A method includes identifying one or more elephant flows operated by a plurality of user equipment (UE) terminals located in a first coverage area, comparing the one or more elephant flows to threshold characteristics, determining whether the coverage area is congested, causing handover of the plurality of UE terminals from the first coverage area when the one or more elephant flows exceed the threshold characteristics and the first coverage area is congested.

Embodiments of this disclosure provide a relay reselection method and apparatus and a system; includes: relay equipment monitors a triggering condition for relay reselection; the relay equipment judges whether the triggering condition for relay reselection is met; and the relay equipment transmits relay reselection indication information to a remote terminal taking the relay equipment as a relay when the triggering condition for relay reselection is met, to indicate the remote terminal to perform relay reselection; wherein, the triggering condition for relay reselection is that an air interface channel of the relay equipment is out of synchronization or is about to be out of synchronization, or a notification of terminating a relay function is received, or power of the relay equipment is insufficient. With the embodiments of this disclosure, a time of interruption due to a poor relay link may be reduced, and occurrence of long-time traffic interruption may be avoided.

According to some aspects, a first base station may communicate with a second base station (e.g. during a handover process) regarding support of new carrier types by a wireless device. The first base station may receive parameters from a wireless device via a legacy carrier indicating whether the wireless device supports a new carrier type, and information about these parameters may be transmitted to the second base station. The first base station may receive messages for configuring communications between the wireless device and the second base station, which may include identification of legacy carriers and associated new carrier type carriers. The configuration information may be transmitted to the wireless device and the second base station may communicate with the wireless device based on the configuration information.

Provided are a method for performing handover in a cellular mobile communication system that supports a carrier aggregation, and a user equipment and a node base (NodeB) using the method. A connection between the user equipment and the NodeB may be maintained and information may be exchanged using a plurality of serving carriers. Before performing the handover, the user equipment may perform measurement with respect to a neighboring NodeB supporting the carrier aggregation, and may provide parameter information to the NodeB in order to support a carrier aggregation function required for the handover. In a handover seamless environment, the continuity of a service may be provided and the performance of the service may be enhanced.

Disclosed are a handover method, a master evolved NodeB (MeNB) and a secondary evolved NodeB (SeNB), wherein, the method is applied to perform a handover on a MeNB for a user equipment (UE) in a multi-connection scenario in which the UE has connections with both a master evolved NodeB (MeNB) and a secondary evolved NodeB (SeNB), including: a source MeNB initiating a handover, and sending a handover command to the UE after receiving a corresponding response, instructing the UE to perform the handover on the MeNB via the handover command, and remaining a connection with the SeNB; after the UE successfully accesses a destination MeNB, the source MeNB or the destination MeNB sending a handover instruction message to the SeNB connected with the UE, the SeNB connected with the UE establishing an association with the destination MeNB according to the handover instruction message.

A method and apparatus for transmitting data for a bi-directional transmission in a wireless communication system is provided. A user equipment (UE) receives a grant including a radio network temporary identity (RNTI) for the bi-directional transmission from a network. Upon detecting the RNTI for the bi-directional transmission, the UE transmit data via at least one of an uplink (UL) channel or a sidelink (SL) channel. The bi-direction transmission may correspond to vehicle-to-everything (V2X) communication.