SBFD-Aware RACH Configuration for Seamless PRACH Mode Switching
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Solution Overview
Problem
The challenge in wireless communication systems is managing transitions between sub-band frequency division duplex (SBFD) and non-SBFD modes during a random access channel (RACH) occasion without interrupting RACH preamble transmissions.
Innovation Solution
Configuring and operating SBFD-aware user equipment (UE) to manage transitions by determining configuration transition periods before, during, or after the RACH occasion, applying scheduling restrictions, and reporting UE capabilities for seamless switching between SBFD and non-SBFD modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE switches from SBFD mode to non-SBFD mode during a RACH occasion, then the UE can adapt to different communication modes, but the RACH preamble transmission may be interrupted
Solution Approach 1:
The patent applies preliminary action by defining a configuration transition period before the actual mode switch. The UE determines this transition period in advance and uses it to prepare for the mode change without interrupting the RACH preamble transmission. This allows the UE to switch from SBFD mode to non-SBFD mode while maintaining continuous transmission, thus resolving the contradiction between mode adaptability and transmission reliability
2Adaptability or versatility
If the UE determines configuration transition periods before, during, or after the RACH occasion, then the UE can manage mode transitions flexibly, but the system complexity increases
Solution Approach 1:
The patent segments the transition management into distinct phases: a first time period before the RACH occasion, a second time period after the RACH occasion, and a third time period during the transition period. This segmentation allows the UE to handle mode transitions in manageable chunks, reducing the cognitive load and simplifying the configuration management process while maintaining transition flexibility
3Productivity
If the RACH occasion spans across SBFD symbols and non-SBFD symbols, then the system can utilize both communication modes, but the transition between modes becomes more complex
Solution Approach 1:
The patent applies universality by designing a unified RACH occasion that can operate in both SBFD mode and non-SBFD mode. The same RACH occasion structure serves dual purposes, allowing the system to utilize both communication modes without requiring separate dedicated occasions. This reduces the overall system complexity while maintaining the ability to switch between modes efficiently
Data Source
AI summary
Methods and apparatuses are provided for managing transitions between sub-band frequency division duplex (SBFD) and non-SBFD modes in full duplex communication systems. A RACH occasion is configured spanning across a SBFD symbol, a subsequent non-SBFD symbol, and a period between the symbols for transitioning between SBFD communications and non-SBFD communications. A wireless device may determine whether a UE is to switch from a first uplink configuration associated with SBFD communications to a second uplink configuration associated with non-SBFD communications during a configuration transition period. The device may communicate a RACH preamble before, during, or after the switch. A timing of the configuration transition period may be based on scheduling restrictions, reported UE capabilities, determined guard symbol lengths, or configured SBFD or non-SBFD modes for RACH occasions. Thus, uninterrupted PRACH transmission across SBFD and non-SBFD symbols may be achieved, enhancing the efficiency of data communication in full duplex systems.