摘要:
Presented is an apparatus and methods for determining if a determined systematic imbalance difference between a serving base station and one or more candidate base stations exceeds a threshold value and, if so, then using uplink information as part of a handover mechanism. The selective usage of uplink information in the handover mechanism can improve handover performance without unduly adding to complexity and signaling overhead.
摘要:
The present invention relates to a method and an arrangement (102, 104, 106, 202, 302, 304, 502, 504, 702, 704, 1000, 1014) for prioritizing one of multiple cell-related mobility decisions associated with multiple parallel mobility events being triggered, comprising recognizing parameter settings associated with at least two parallel mobility events being triggered (steps 406, 604; 806), evaluating the parameter settings for determining which cell-related mobility decision to prioritize (steps 408; 606; 808), and performing a task according to the cell-related prioritized mobility decision (steps 410, 608; 814), to achieve a cell re-selection in idle mode or a hand over in connected mode. By applying multiple parameter settings a better performance is achieved as can be seen by a reduced percentage of time a User Equipment (102, 202, 302, 502, 702, 1000) is not connected to the best cell.
摘要:
One aspect of the teachings herein involves the advantageous use of learned statistical information to improve inter-cell interference coordination (ICIC). The network uses historical signal quality measurements collected over time for wireless communication devices operating within its coverage areas to identify those geographical areas where devices generally experience significant levels of patterned interference. In an example case, the network develops a “map” of the geographical areas that are affected by the transmission patterns of neighboring nodes, and it applies the map to ICIC operations, wherein the serving nodes associated with the affected areas incorporate knowledge of the interfering transmission patterns into the ongoing scheduling of users operating in the affected areas.
摘要:
The invention relates to a method for retransmitting data packets in a network. Further, the invention relates to an adapted system for performing the method. To improve the robustness in the transmission of an acknowledgment message by a mobile terminal to the network, while minimizing a signaling overhead, the invention provides mechanisms that optimize the retransmission of data packets and manage acknowledgement messages. The mechanisms disclosed are particular applicable to heterogeneous radio access networks.
摘要:
The disclosed solution dynamically selects a handover trigger for triggering handover of a mobile terminal in a wireless network from a source base station to a target base station based on one or more Key Performance Indicators (KPIs). Each KPI indicates a quality of wireless services provided by the wireless network responsive to a particular handover trigger. A trigger selection circuit selects one of multiple candidate triggers as the handover trigger based on a comparison between corresponding KPIs for different ones of the candidate triggers.
摘要:
Systems and methods are disclosed for selecting resources for direct device to device communications in a cellular communication network. Preferably, resources for the direct device to device communications are selected to minimize, or at least substantially reduce, interference that results from the direct device to device communications in the cellular communication network. In one embodiment, a downlink resource of the cellular communication network is selected as a resource for a direct device to device communication link between a first wireless device and a second wireless device if at least one of the first and second wireless devices is less than a predefined threshold radio distance from a closest base station in the cellular communication network. Otherwise, an uplink resource of the cellular communication network is selected as a resource for the direct device to device communication link between the first and second wireless devices.
摘要:
The invention relates to a method in a user equipment for channel estimation, the user equipment communicating within a wireless communication system comprising at least two cells arranged in a layered structure, the at least two cells using at least partly overlapping bandwidth. The user equipment communicates with a base station of an underlaid cell of the layered structure, and the Select resource method comprises the steps of: selecting, from elements carrying CRSs among resource blocks scheduled for the user equipment in the underlaid cell, resource elements carrying cell specific reference symbols, wherein the resource blocks are within bandwidth used by the underlaid cell; and performing the channel estimation by utilizing the selected resource elements carrying cell specific selected resource reference symbols. The invention also relates elements carrying CRSs to user equipment implementing the method.
摘要:
Method and arrangement in a first base station for scheduling in a TDD wireless network, which wireless network comprises the first base station serving a user equipment, and a second base station. The method comprises detecting that the second base station uses a different TDD configuration, instructing the user equipment to provide a signal strength measurement report based on a signal received from the second base station, receiving the measurement report, and allocating resources to the user equipment based on the received measurement report. Thereby is allocation of resources in TTIs not having the same uplink-downlink direction in the first base station and the second base station respectively, is avoided for the user equipment, when the received signal strength measurement report indicates that such allocation is appropriate. Also, a method and arrangement in a user equipment for scheduling in a TDD wireless network is described.
摘要:
A method in a first user equipment (UE 1) connectable to a second user equipment (UE 2) via a communication network or via a direct radio communication link, of using a direct radio communication link for communication between the UEs is initiated when one of the UEs receives probe signaling information comprising a first probe token via the communication network. The UEs exchange probe signaling messages including a second and/or the first probe token at least partly according to the probe signaling information, such that one of the UEs can compare the probe tokens, generate a probing report and provide the probing report to the communication network, or to the opposite UE for evaluation in case of a successful comparison and such that a direct radio communication link can be used for communication with UE 2 in response to receiving instructions to use the second direct radio communication link from the entity by which the probing report was evaluated.
摘要:
Method and arrangement in a mobile terminal in a wireless communication system, for supporting a handover from a serving cell to a target cell. The method comprises determining 104a if the mobile terminal has moved in a predefined way in relation to at least one potential target cell. The determining is based on Doppler shift measurements 102a. The method further comprise adjusting 106a at least one handover related parameter, in order to enable a fast handover, when it is determined that the mobile terminal has moved in the predefined way in relation to the at least one potential target cell.