Semi-Persistent Scheduling Control Signal Segmentation for 5G
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Solution Overview
Problem
In wireless communication systems, especially in 5G technologies for Ultra-Reliable Low Latency Communication (URLLC) and massive Machine Type Communications (mMTC), semi-persistent scheduling (SPS) and configured grant (CG) configurations face inefficiencies due to outdated channel conditions and high UE-specific DCI overhead, leading to poor spectral efficiency and potential PDCCH blocking.
Innovation Solution
A method and apparatus that transmit radio resource control (RRC) signals and physical layer control signals to user equipment (UE) for SPS and CG configurations, including modulation and coding schemes, time and frequency resource allocations, using a limited number of parameters in the physical layer control signal to achieve high spectral efficiency without the drawbacks of UE-specific DCI overhead and PDCCH blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RRC signaling is used to configure SPS/CG parameters, then configuration flexibility is improved, but signaling overhead and latency increase due to slow updates
Solution Approach 1:
The configuration parameters are segmented into two groups: those updated via RRC signaling (modulation and coding schemes, time and frequency resource allocations) and those updated via physical layer control signals (other transmission parameters). This segmentation allows critical parameters to be updated quickly while maintaining flexibility for less time-sensitive parameters through RRC.
Solution Approach 2:
The RRC signaling pre-configures the SPS/CG parameters including modulation and coding schemes and resource allocations before actual transmission occurs. This preliminary configuration reduces the need for frequent updates during transmission, thereby reducing signaling latency while maintaining configuration flexibility.
2Measurement precision
If UE-specific DCI is used for parameter updates, then transmission accuracy is improved, but DCI overhead and PDCCH blocking increase
Solution Approach 1:
The physical layer control signal is designed to serve multiple UEs simultaneously by incorporating identifiers for different UEs within the same control signal structure. This allows one control signal to update parameters for multiple UEs, reducing overall DCI overhead and PDCCH blocking while maintaining accurate parameter updates for each UE through the included identifiers.
Data Source
AI summary
Methods and apparatuses are disclosed for semi-persistent scheduling and configured grant transmission configurations. An example method, which is performed by a communication device, includes the steps of: transmitting, to a user equipment (UE), a radio resource control (RRC) signal or activation downlink control information (DCI) signal for semi-persistent scheduling (SPS) or configured grant (CG) transmission configuration; and transmitting, to the UE, a physical layer control signal comprising an indication of one or more parameters for SPS or CG transmission.