SRS Transmission Scheme for Subband Full-Duplex Slots
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Solution Overview
Problem
Wireless communication systems face challenges in managing sounding reference signal (SRS) transmissions when they overlap with the boundary between subband full-duplex (SBFD) and non-SBFD symbols, leading to inefficiencies and potential interruptions due to frequent switching between duplex modes.
Innovation Solution
The implementation of a transmission scheme that defines rules for UE behavior, including transmit or drop rules for SRS transmissions based on resource parameters, frequency and time resources, and the presence of guard periods, to manage SRS transmissions across mixed SBFD and non-SBFD symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SRS transmissions are performed across SBFD and non-SBFD symbol boundaries, then channel sounding coverage is improved, but transmission reliability deteriorates due to frequent duplex mode switching
Solution Approach 1:
The patent segments the SRS transmission resources by introducing separate resource configurations for SBFD symbols and non-SBFD symbols. The network device configures first SRS resources for non-SBFD symbols and second SRS resources for SBFD symbols, allowing independent management and optimization of transmission parameters in each duplex mode, thereby improving reliability while maintaining coverage.
Solution Approach 2:
The patent implements dynamic SRS transmission switching where the UE adapts its transmission behavior based on the current symbol type (SBFD or non-SBFD). The transmission scheme dynamically selects between first SRS resources and second SRS resources according to the duplex mode, enabling flexible adaptation to changing channel conditions and reducing transmission conflicts.
2Reliability
If guard periods are inserted between SBFD and non-SBFD symbols, then transmission reliability is improved by reducing interference, but transmission efficiency deteriorates due to resource overhead
Solution Approach 1:
The patent applies local quality by configuring guard periods selectively only at the boundaries between SBFD and non-SBFD symbol groups where interference occurs, rather than inserting guard periods throughout the entire transmission. This localized approach provides necessary protection against interference while minimizing the overall resource overhead and maintaining transmission efficiency in other regions.
3Productivity
If multi-symbol SRS transmissions are scheduled without considering SBFD/non-SBFD boundaries, then resource utilization is improved, but phase continuity deteriorates causing transmission errors
Solution Approach 1:
The patent implements preliminary action by pre-configuring separate SRS resource parameters for SBFD and non-SBFD symbols, including precoding matrices, cyclic shifts, and orthogonal covers. The network device provides these differentiated configurations in advance through RRC signaling or MAC CE, enabling the UE to maintain phase continuity automatically when switching between symbol types without requiring real-time adjustments.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an indication of resource parameters for performing sounding reference signal transmissions during a slot comprising at least one subband full-duplex symbol and at least one non-subband full-duplex symbol. The UE may perform multi-symbol sounding reference signal transmissions during the slot according to a transmission scheme associated with the resource parameters, the transmission scheme defining a transmit or drop rule based on a first subset of sounding reference signal transmissions being scheduled in the at least one subband full-duplex symbol of the slot and a second subset of sounding reference signal transmissions being scheduled in the at least one non-subband full-duplex symbol of the slot.