Measurement-based random access configuration
摘要
說(shuō)明書(shū)
In various embodiments with analog (RF) receive beamforming, a TP may not use multiple different analog receive beamforming on the same received signal, since there is a single set of receiver hardware and the analog receive beamforming is a real-time operation on the actual analog signal. Instead, at a given time instant, only a single analog receive beamforming configuration is possible in this embodiment. Such a configuration can be given by relative phase shifts in the combination of different receive antennas or groups of receive antennas, and corresponding amplification factors, in various embodiments. In various embodiments, it is possible to reconfigure the analog receive beamforming dynamically, i.e. “on the fly”. In various embodiments, the invention can help to improve the coverage in which a TP can detect random access signals. Without using the invention, the random access signal detection might become the coverage bottleneck. Following the reasoning for digital receive beamforming, a TP can deduce a suitable receive beamformer for a certain random access resource. Hence, by using an appropriate random access mapping that lets devices that likely have similar suitable receive beamforming, in some embodiments, or similar suitable analog receive beamforming, in some embodiments (such as with hybrid beamforming), select sets of allowed random access resources overlap, completely or partially, in time. Hence, a TP may in a certain time period choose the corresponding receive beamforming, in some embodiments, or the corresponding analog receive beamforming, in some embodiments, that is likely suitable for a device that chooses a random access resource in the time period and transmits a random access signal therein.
