Techniques in configured grant uplink transmission in new radio (NR) systems operating in unlicensed spectrum
摘要
說明書
Processors of the application circuitry 202 and processors of the baseband circuitry 204 may be used to execute elements of one or more instances of a protocol stack. For example, processors of the baseband circuitry 204, alone or in combination, may be used to execute Layer 3, Layer 2, or Layer 1 functionality, while processors of the application circuitry 202 may utilize data (for example, packet data) received from these layers and further execute Layer 4 functionality (for example, transmission communication protocol (TCP) and user datagram protocol (UDP) layers). As referred to herein, Layer 3 may comprise a radio resource control (RRC) layer, described in further detail below. As referred to herein, Layer 2 may comprise a medium access control (MAC) layer, a radio link control (RLC) layer, and a packet data convergence protocol (PDCP) layer, described in further detail below. As referred to herein, Layer 1 may comprise a physical (PHY) layer of a UE/AN, described in further detail below.
There may be two configured grant mechanisms for an NR operation in unlicensed spectrum, Type 1 and Type 2. Type 1 may be based on an RRC configuration. Type 2 may be based on an RRC configuration and a Layer 1 (L1) activation and deactivation. Type 1 mechanism may have an advantage that the UE 105 can start a grant-free transmission as the corresponding RRC configured, since there is no waiting for L1 activation message. Meanwhile, Type 2 mechanism may be more flexible in indicating, including but not limited to, desired time and/or frequency domain resources, UE-specific demodulation reference signal (DMRS) configurations, and modulation coding scheme (MCS)/transport block size (TBS) values. Further, a network may have better controllability with Type 2 in terms of managing a set of autonomous UEs for uplink transmission.
