Measurement-based random access configuration
摘要
說明書
Subsequently, the device obtains synchronization, performs measurements and receives system information. Then the device transmits a random access signal according to the configuration in the system information. For simplicity of description, beamforming in the device is not discussed here, but it should be understood that the various embodiments of this invention described herein, also apply to beamforming in the device. Also, beamforming in the device may be used together with aspects of the disclosed invention, using beamforming in the TP's. Beamforming need not be used either in the TP's or in the devices, but may also be used in both.
Accordingly, the TP receives and detects the random access signal. Due to the randomness of random access, the TP does not know beforehand which devices that choose to transmit random access signals on a certain random access resource and their corresponding suitable receive beamforming. Therefore, a TP cannot deliberately apply the suitable analog (RF) beamforming during the reception of a random access signal if not for the present disclosure. With digital receive beamforming of the disclosure, on the other hand, it is possible for a TP to apply multiple different receive beamformers to the received signal and perform detection on each of the receive beamformed signals, even though it increases the receiver complexity.
