Network-Controlled Repeater Type 2 Configured Grants With UL Forwarding Delay
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Solution Overview
Problem
Current communication systems face limitations in flexibility and efficiency, particularly in configuring network-controlled repeaters (NCRs) for semi-static uplink transmissions, which are essential for enhancing coverage and supporting services like eMBB, URLLC, and mMTC in 5G networks.
Innovation Solution
The implementation of a network-controlled repeater (NCR) that receives RRC configurations from a gNodeB for configured grants, including resource allocation with beam indication and uplink forwarding delay information, allowing it to manage semi-static UL transmissions by monitoring PDCCH and validating activation/deactivation DCI, and forwarding buffered signals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network controlled repeater (NCR) configurations are implemented for semi-static UL transmissions, then coverage and flexibility are improved, but system complexity and configuration overhead increase
Solution Approach 1:
The configuration is divided into two distinct types: Type 1 CG where RRC configuration directly activates the configured grant, and Type 2 CG where RRC configuration requires subsequent PDCCH activation. This segmentation allows the system to choose the appropriate type based on specific service requirements, thereby managing complexity while maintaining flexibility.
Solution Approach 2:
The system introduces dynamic activation and deactivation mechanisms for Type 2 configured grants through PDCCH signaling with CS-RNTI. This allows the network to dynamically enable or disable uplink transmissions based on current network conditions and service requirements, enhancing flexibility without permanently increasing system complexity.
2Adaptability or versatility
If Type 2 configured grants with PDCCH activation are used, then transmission control flexibility is improved, but latency and signaling overhead increase
Solution Approach 1:
The RRC configuration is performed in advance, pre-defining all necessary transmission parameters including resource allocation, modulation and coding schemes, and timing information. This preliminary configuration ensures that when PDCCH activation occurs, the UE can immediately transmit without additional negotiation delays, thus minimizing latency while maintaining control flexibility.
Solution Approach 2:
The PDCCH acts as an intermediary activation signal that bridges the RRC configuration and actual transmission. It provides a compact, efficient mechanism to trigger pre-configured transmissions without requiring full re-negotiation of parameters, thereby reducing signaling overhead and latency compared to dynamic scheduling.
3Productivity
If uplink forwarding delay information is provided in RRC configuration, then NCR buffering and forwarding efficiency are improved, but configuration complexity increases
Solution Approach 1:
The system introduces a specific parameter 'ul-FwdDelay' in the RRC configuration that directly specifies the uplink forwarding delay in slots. This parameterized approach simplifies the configuration process by providing a clear, standardized way to define timing relationships, reducing configuration complexity while improving forwarding efficiency through optimized buffering timing.
Data Source
AI summary
A network controlled repeater (NCR) is described. The NCR includes receiving circuitry configured to receive a radio resource control (RRC) configuration from a gNodeB (gNB) on a configured grant (CG), including resource allocation with beam indication, an uplink (UL) forwarding delay information and an NCR configured scheduling-radio network temporary identifier (CS-RNTI).