Methods of operating wireless terminals and network nodes using high speed vehicle network indicators and related wireless terminals and network nodes
摘要
說明書
Also, the accuracy of the speed state determination may not be perfect. Accuracy was studied earlier by RAN4. There may always be a possibility that a UE will make a wrong determination of mobility state. Hence, there may be undesirable side effects when a network configures speed dependent scaling such as UEs which are not being operated on the high speed train network making a medium or high mobility state determination, or vice versa, UEs which are on the high speed rail network not making a high speed determination. In practice, it may be quite difficult to find a good parameter set which ensures accurate mobility state detection while at the same time not incurring too long delays in making the determination.
According to some embodiments of inventive concepts where a dedicated network serves high velocity UEs, the network node (e.g., serving cell) may provide an explicit indication to UEs that they are being operated in a high speed environment in a cell or in a group of cells operating on the same carrier or distributed over different carriers. When this indication is provided, UEs may operate in a high speed mode of operation, where algorithms or procedures for receiving radio signals are improved/optimized by the UE for the operating environment. Further details and examples of improvement/optimization are provided in the following discussion.
In other embodiments of inventive concepts, a UE may acquire an explicit indication about high speed operation from one or more cells, store or log the acquired explicit indication(s), and transmit the logged information to the network node.
