SBFD Symbol Configuration for Cross-Symbol Duplex Restrictions
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Solution Overview
Problem
Wireless communications systems face challenges in improving signal transmission and reception efficiency, reliability, and coverage due to complex and dynamic environments, which attenuate or block signals between transmitters and receivers, necessitating advancements in duplex communication modes.
Innovation Solution
The implementation of subband full duplex (SBFD) communication, where a time division duplex carrier is split into uplink and downlink sub-bands to enable simultaneous transmission and reception on different subbands within the same slot, with restricted processing of signals across SBFD and non-SBFD symbols, indicated by configuration frameworks using RRC signaling, MAC control elements, and DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subband full duplex (SBFD) communication is implemented to enable simultaneous transmission and reception on different subbands, then spectral efficiency and data rate are improved, but signal interference and processing complexity increase
Solution Approach 1:
The patent divides the frequency spectrum into multiple subbands, allowing simultaneous uplink and downlink transmissions on different subbands within the same time slot. This segmentation enables full duplex operation by separating transmit and receive frequencies, thereby improving spectral efficiency while managing interference through frequency division
Solution Approach 2:
The patent applies different processing restrictions to different symbol types (SBFD symbols versus non-SBFD symbols). For SBFD symbols, the UE is restricted from processing certain signals to avoid self-interference, while non-SBFD symbols allow normal processing. This localized quality control optimizes performance in specific frequency-time regions without compromising overall system operation
2Adaptability or versatility
If SBFD symbols are configured with frequency allocation including downlink and uplink subbands, then communication flexibility and resource utilization are improved, but signal attenuation and interference from complex environments worsen
Solution Approach 1:
The patent enables dynamic configuration of SBFD symbols with flexible frequency allocations that can be adjusted based on channel conditions and traffic requirements. The network can dynamically assign different subbands for uplink and downlink, and dynamically control whether UEs are restricted from processing signals across SBFD and non-SBFD symbol boundaries, adapting to changing environmental conditions
Solution Approach 2:
The patent introduces signaling mechanisms (RRC signaling, MAC control elements, DCI) that act as intermediaries between the network and UEs to coordinate SBFD operation. These signaling intermediaries enable the network to inform UEs about SBFD symbol configurations and processing restrictions, ensuring reliable communication by coordinating actions across the interface between network controller and wireless devices
3Measurement precision
If restrictions are imposed on UE operation across SBFD and non-SBFD symbols, then signal processing clarity is improved, but operational flexibility and device versatility worsen
Solution Approach 1:
The patent applies processing restrictions partially - only during SBFD symbols and only for specific signal types. The restrictions prevent UEs from processing signals that would cause self-interference during SBFD operation, while allowing normal processing during non-SBFD symbols. This partial application of restrictions maintains signal processing clarity where needed without unnecessarily limiting operational flexibility
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for subband full duplex (SBFD) transmission/reception across SBFD and non-SBFD symbols. An example method, performed at a user equipment (UE), generally includes obtaining signaling indicating 1) a first one or more symbols configured as subband full duplex (SBFD) symbols with a frequency allocation that includes at least one downlink subband and at least one uplink subband, 2) a second one or more symbols configured as non-SBFD symbols, and 3) whether operation of the UE is subject to one or more restrictions for transmission or reception of signals across the first one or more symbols and the second one or more symbols, and processing signals in at least one of the first one or more symbols or the second one or more symbols, in accordance with the signaling.