Network-Controlled Repeater Handling of TDD Flexible Symbols
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing flexible symbols in time division duplexing (TDD) schemes, particularly in 5G NR systems, due to the need for dynamic and flexible handling of uplink and downlink data transmission.
Innovation Solution
Network-controlled repeaters (NCRs) receive side control information (SCI) from a base station to determine the direction of flexible symbols/slots, applying prioritization schemes to treat them as uplink or downlink based on dynamic or semi-static TDD configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic TDD configuration is applied to flexible symbols, then adaptability and versatility are improved, but device complexity increases due to the need for prioritization schemes and multiple configuration handling
Solution Approach 1:
The patent implements dynamic TDD configuration where the direction of flexible symbols can be changed based on real-time network conditions. The base station sends DCI messages to dynamically adjust the uplink-downlink configuration of flexible symbols, allowing the system to adapt to varying traffic demands while maintaining a relatively simple determination process through predefined prioritization rules
Solution Approach 2:
The patent changes the time-domain parameter (symbol direction) of flexible symbols dynamically. By receiving DCI messages that indicate direction changes for flexible symbols, the system can switch between uplink and downlink modes based on traffic requirements, resolving the contradiction between adaptability and complexity through parameter-based control
2Device complexity
If implicit determination of flexible symbol direction is used, then device complexity is reduced, but loss of information increases due to reliance on neighboring symbol directions
Solution Approach 1:
The patent applies preliminary action by configuring the determination rules for flexible symbol directions in advance. The prioritization scheme is pre-defined, considering factors such as neighboring symbol directions, TDD configuration, and DCI indications in a specific order. This allows the NCR to determine symbol directions using simple rules while minimizing information loss through the structured approach
Solution Approach 2:
The patent uses DCI messages as an intermediary to convey direction information for flexible symbols. Instead of directly complex processing or relying solely on implicit neighboring symbol patterns, the base station sends explicit direction indications through DCI, which the NCR uses to resolve ambiguities and accurately determine symbol directions with minimal information loss
Data Source
AI summary
Apparatuses, systems, and methods for determining network-controlled repeater (NCR) behavior over flexible symbols in TDD schemes, e.g., in 5G NR systems and beyond. An NCR may receive, from a base station, side control information (SCI). The SCI may include an indication of time-domain resources. The NCR may be configured to determine, based, at least in part, on the SCI, a direction for one or more flexible symbols and/or flexible slots (flexible symbols/slots) on an access link with a user equipment device (UE). The NCR may be configured to treat the one or more flexible symbols/slots as uplink symbols/slots or downlink symbols/slots based on the determination. In other words, the NCR may determine that the flexible symbols/slots are uplink symbols/slots and/or downlink symbols/slots and forward data received on the flexible symbols/slots accordingly.