5G Terminal Multicast Reception Control via Common RNTI
Solution Overview
Problem
In next-generation mobile communication systems, specifically in the 5G network, there is a challenge in controlling the reception of multicast transmission using a physical downlink shared channel (PDSCH), as existing LTE systems employ a physical multicast channel (PMCH, which is different from the PDSCH used in 5G.
Innovation Solution
A terminal is designed with a receiving section for downlink control information scrambled with a common radio network temporary identifier (RNTI) and a control section that manages the reception of multicast traffic channels (MTCH) using the PDSCH scheduled across one or more bandwidth parts in a cell, enabling appropriate control of multicast transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multicast transmission is performed using a physical multicast channel (PMCH) as in LTE systems, then the channel structure is simple and easy to implement, but the terminal cannot appropriately control reception in the context of 5G NR's physical downlink shared channel (PDSCH)
Solution Approach 1:
The patent changes the key parameter of channel type from PMCH to PDSCH, and introduces a common RNTI (Radio Network Temporary Identifier) as a new parameter for CRC scrambling. This allows the terminal to identify and control multicast transmission reception by monitoring PDCCH with the common RNTI, thereby adapting to the 5G NR channel structure while maintaining manageable terminal complexity through standardized identification mechanisms.
2Reliability
If a common RNTI is used for CRC scrambling of downlink control information scheduled in one or more bandwidth parts, then the terminal can effectively control multicast transmission reception, but the control information may be overlooked by the terminal
Solution Approach 1:
The patent introduces a common RNTI as an intermediary identifier that mediates between the base station's multicast transmission scheduling and the terminal's reception control. By scrambling CRC bits with this common RNTI, the terminal can reliably identify and process control information for multicast channels in one or more bandwidth parts, preventing overlooking while maintaining system reliability.
3Productivity
If downlink control information is scheduled in one or more bandwidth parts using a physical downlink shared channel, then high capacity and flexibility are achieved, but the terminal must manage multiple bandwidth parts which increases complexity
Solution Approach 1:
The patent applies universality by using a single common RNTI mechanism that works across one or more bandwidth parts. This universal identifier allows the terminal to manage multiple bandwidth parts more easily, as the same RNTI-based identification and control mechanism applies to all bandwidth parts, thereby reducing the complexity increase that would otherwise result from managing multiple separate control channels.
Data Source
AI summary
A terminal includes a receiving section that receives downlink control information for which cyclic redundancy check (CRC) bits are scrambled with use of a radio network temporary identifier (RNTI) common to one or more terminals, and a control section that controls reception of data associated with a multicast traffic channel (MTCH) with use of a physical downlink shared channel scheduled by the downlink control information in one or more bandwidth parts in a cell. Therefore, it is possible to appropriately control reception of multicast transmission using a physical downlink shared channel.