Multi-Bandwidth Slot Configuration for Wireless Duplex Operation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing duplex operations, particularly in 5G and beyond, due to issues such as cross-link interference and self-interference in full-duplex transmissions, which affect spectral efficiency and latency.
Innovation Solution
Implementing a system where user equipment (UE) and base stations (BS) determine slot configurations based on first and second information indicating bandwidths for uplink, downlink, or flexible symbols, allowing for dynamic direction determination of symbols to support duplex operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex transmissions are implemented to improve spectral efficiency, then spectral efficiency is improved, but cross-link interference and self-interference occur
Solution Approach 1:
The system segments the slot configuration into multiple parts (first slots with first BW, second slots which are a subset of first slots with second BW) and assigns different directions to different segments. This allows simultaneous UL and DL transmissions in different slot segments, enabling full-duplex operation while managing interference through segmentation of time-frequency resources.
Solution Approach 2:
The system dynamically determines the direction (UL or DL) of each slot segment based on received information indicating BW configurations. The direction of symbols in first slots and second slots can be flexibly adjusted according to traffic demands and interference conditions, allowing adaptive full-duplex operation that optimizes spectral efficiency while mitigating cross-link interference.
2Loss of time
If full-duplex transmissions are implemented to reduce latency, then latency is reduced, but self-interference occurs
Solution Approach 1:
The system introduces bandwidth dimension as an additional degree of freedom for duplex operation. By configuring different BWs (first BW and second BW) for different slot segments and determining directions in multiple dimensions (time slots and frequency BW), the system enables full-duplex transmission that reduces latency while using frequency separation to mitigate self-interference between simultaneous UL and DL transmissions.
3Productivity
If dynamic slot configuration is implemented to support flexible duplex operations, then spectral efficiency is enhanced, but device complexity increases
Solution Approach 1:
The transceiver is designed with multi-functionality to handle both first slots and second slots, capable of receiving information indicating multiple BW configurations and determining directions for different slot segments. This universal transceiver design supports flexible duplex operations across different slot configurations and BWs, enabling enhanced spectral efficiency while consolidating functionality to manage device complexity.
Data Source
AI summary
Methods and apparatuses for duplex operation in a wireless communication system. A method for operating a user equipment (UE) includes receiving, for a cell, first information indicating first slots with uplink (UL), downlink (DL), or flexible (F) symbols associated with a first bandwidth (BW) and second information indicating second slots with UL, DL, or F symbols associated with a second BW. The second slots are a subset of the first slots. The method further includes determining a first direction for a first set of symbols of the first slots based on the first information and a second direction for a second set of symbols of the second slots based on the first information and the second information. The method further includes transmitting or receiving over the first set of symbols and over the second set of symbols.