Measurement-based random access configuration
摘要
說明書
The TP responds with a random access response. After random access signal detection, a TP responds to the device. If the transmit beamforming is UL-based (see above), the TP may use the received random access signal to find a suitable transmit beamformer in various embodiments. However, due to the lack of high-quality, e.g. orthogonal, RS within a random access signal, low received signal energy, or other factors, it may be difficult for a TP to reliably compute a suitable transmit beamformer based on a single random access signal. If the transmit beamforming is based on RS and feedback (see above), the TP has not yet received such feedback. Typically, the TP does not even know the identity of the device which transmitted the detected random access signal. Furthermore, even if the TP would know the identity of the device, a random access attempt is typically preceded by a period of device inactivity (the device being idle), which means that last received feedback might not be valid (accurate) any more. In summary, it might often be difficult for a TP to apply a suitable transmit beamforming to the random access response if not for the present disclosure.
