SBFD Symbol Collision Handling in Carrier-Aggregated Cells
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Solution Overview
Problem
Existing wireless communication systems face challenges in adequately defining conflict handling for subband full duplex (SBFD) operations, particularly in carrier aggregation scenarios where different cells are configured on different component carriers, leading to inefficiencies and performance issues.
Innovation Solution
Implementing rules for collision handling in SBFD operations, specifically for intra-CA based SBFD, to manage conflicts between downlink reception and uplink transmission within subband component carriers, enhancing spectral efficiency and system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If directional collision handling is enabled for SBFD operations in carrier aggregation scenarios, then spectral efficiency and system performance are improved, but device complexity and configuration complexity increase
Solution Approach 1:
The patent segments the SBFD operation configuration into multiple independent components: per-serving-cell directional collision handling enablement, per-component-carrier SBFD symbol configuration, and per-symbol direction indication. This segmentation allows the system to enable directional collision handling only for specific cells and carriers that require it, rather than globally, thereby improving spectral efficiency where needed while limiting configuration complexity to only the necessary portions of the system.
Solution Approach 2:
The patent implements dynamic configuration where the network entity can independently enable or disable directional collision handling for each serving cell and each component carrier based on traffic conditions and interference scenarios. The symbol direction for SBFD symbols can be dynamically indicated through DCI or other downlink signals, allowing the system to adapt to changing conditions without requiring static complex configuration for all possible scenarios.
2Reliability
If rules for handling collisions between downlink reception and uplink transmission are implemented, then system performance is improved, but processing complexity and signaling overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring SBFD symbol positions and directions through higher layer signaling (RRC configuration) before actual data transmission occurs. The network entity pre-establishes the TDD-UL-DL-Configuration for each serving cell, indicating which symbols are SBFD symbols and their default directions. This preliminary configuration reduces real-time processing complexity during data transmission, as the UE already has the collision handling rules in place and only needs to follow the pre-established configuration rather than making complex decisions in real-time.
Solution Approach 2:
The patent implements feedback mechanisms where the network entity monitors uplink transmission quality and downlink reception quality, and based on this feedback, dynamically adjusts the symbol direction indications and collision handling configurations. The network can send DCI format 2_1 or other downlink signals to indicate the actual direction of flexible symbols, providing feedback-based adaptation that improves system performance while keeping UE processing complexity manageable through standardized feedback loops.
Data Source
AI summary
Certain aspects of the present disclosure provide a method for wireless communications at a user equipment (UE) generally including obtaining first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC, obtaining second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC, and communicating with the one or more serving cells based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules.