PUSCH Capability Signaling for RedCap Downlink Adaptation
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Solution Overview
Problem
In reduced capability (RedCap) terminals, the reduced number of receiving antennas leads to degraded downlink channel reception, resulting in reduced downlink spectrum efficiency due to default transmission settings by the network device.
Innovation Solution
The terminal device reports its device type or receiving capability through physical uplink shared channels (PUSCH) using various reporting modes, such as scrambling codes and DMRS sequences, allowing the network device to adjust transmission modes accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the network device uses default transmission settings for downlink channels, then the system is simple to operate, but the downlink spectrum effectiveness is reduced
Solution Approach 1:
The terminal device feeds back its capability information (number of receiving antennas, processing speed, bandwidth) to the network device through uplink signaling. This feedback mechanism enables the network device to adapt its downlink transmission settings to match the terminal's actual capabilities, thereby improving downlink spectrum effectiveness while maintaining operational simplicity through automated adaptation.
Solution Approach 2:
The network device dynamically adjusts downlink transmission parameters (modulation and coding scheme, resource allocation, antenna ports) based on the terminal's reported capabilities. This dynamic adaptation allows the system to optimize performance for each terminal type (RedCap or non-RedCap) rather than using static default settings, resolving the contradiction between operational simplicity and spectrum effectiveness.
2Device complexity
If the network device configures transmission modes according to default antenna quantity, then the configuration process is simple, but the downlink channel reception performance is degraded
Solution Approach 1:
The terminal device performs preliminary action by reporting its capability information before the network device configures downlink transmission. This advance information provision allows the network device to set appropriate transmission parameters (number of antenna ports, reference signal configurations) matched to the terminal's receiving capabilities, ensuring reliable downlink reception without increasing configuration complexity through automated capability-based settings.
3Device complexity
If the terminal device has reduced number of receiving antennas, then the device complexity is reduced, but the downlink spectrum utilization is reduced
Solution Approach 1:
The network device applies local quality by configuring transmission parameters specifically tailored to each terminal's capabilities. For terminals with reduced receiving antennas (RedCap), the network device adjusts the number of antenna ports, reference signal density, and modulation schemes to match the terminal's local receiving conditions, thereby optimizing downlink spectrum utilization for each terminal type rather than using uniform configurations.
Data Source
AI summary
The present application provides an information transmission method, a device and a storage medium, and the method includes that: a terminal device generates indication information used to indicate device information of the terminal device and sends the indication information to a network device, where the indication information is carried by a physical uplink shared channel PUSCH. The network device determines the device information of the terminal device according to the received indication information. Through the aforementioned transmission mode, the network device can know a device type or a receiving capability of a terminal, thereby improving utilization rate of a downlink spectrum.