This process aims to find the best receive beam, which can be a neighbor beam or a refined beam. Procedure 3 (P-3): This procedure focuses on receive-end beam adjustment, where the beam sweeping happens at the receive end given the current transmit beam. Finally, the best transmit beam is selected based on the RSRP measurements on all transmit beams. Then the user equipment (UE) or the access network node (gNB) measures all these beams by capturing the signals with a fixed receive beam. Therefore, a set of reference signal resources are configured and transmitted in different directions by using finer beams within the angular range of the beam from the initial acquisition process. The procedure is based on non-zero-power CSI-RS (NZP-CSI-RS) for downlink transmit-end beam refinement and sounding reference signal (SRS) for uplink transmit-end beam refinement.Īfter the initial beam establishment, obtaining a unicast data transmission with high directivity and high gain requires a beam much finer than the SSB beam. Procedure 2 (P-2): This procedure focuses on transmit-end beam refinement, where the beam sweeping happens at the transmit end by keeping the receive beam fixed. For more details on this procedure, see NR SSB Beam Sweeping. In general, the selected beams are wide and may not be an optimal beam pair for the data transmission and reception. During the initial acquisition, beam sweeping takes place at both transmit and receive ends to select the best beam pair based on the RSRP measurements. Procedure 1 (P-1): This procedure focuses on the initial acquisition based on synchronization signal blocks (SSB). TR 38.802 Section 6.1.6.1 defines beam management as three procedures: Beam management is a set of Layer 1 (physical layer) and Layer 2 (medium access control) procedures to establish and retain an optimal beam pair (transmit beam and a corresponding receive beam) for good connectivity. To improve the gain and directionality of the transmission and reception of the signals at higher frequencies, beamforming is essential. As the frequency increases, the transmitted signal is prone to high path loss and penetration loss, which affects the link budget. In NR 5G, frequency range 2 (FR2) operates at millimeter wave (mmWave) frequencies (24.25 GHz to 52.6 GHz).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |