SBFD Spatial Relationship Signaling for Multi-TRP Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving efficient full-duplex operations due to self-interference issues in sub-band full-duplex (SBFD) mode, particularly when the best TRP for downlink and uplink communications is not available during SBFD symbols, leading to dropped or interrupted communications.
Innovation Solution
Implementing spatial relationship indication for SBFD aware UEs, where UEs receive spatial relationship information associated with the full-duplex mode to communicate effectively in SBFD symbols or slots, avoiding issues related to spatial information not being applicable to the directionality of the SBFD mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spatial relationship information is not provided for SBFD mode, then the system complexity remains low, but communication reliability deteriorates due to dropped or interrupted communications
Solution Approach 1:
The network node provides spatial relationship information to the UE in advance before SBFD operations begin. This preliminary provision of spatial configuration data enables the UE to properly configure its spatial filters and beamforming parameters ahead of time, ensuring reliable communication during SBFD symbols without requiring complex real-time adjustments.
Solution Approach 2:
Spatial relationship information acts as an intermediary parameter that bridges the network node and UE communication. This information serves as a configuration mediator that translates network intentions for SBFD operation into actionable spatial parameters for the UE, enabling reliable full-duplex communication without direct complex coordination during operation.
2Productivity
If the best TRP is used for downlink and uplink communications during SBFD symbols, then communication efficiency is improved, but self-interference issues worsen due to simultaneous transmission and reception
Solution Approach 1:
The frequency spectrum is segmented into different sub-bands for downlink and uplink transmissions during SBFD mode. By dividing the bandwidth into separate frequency regions, the system enables simultaneous transmission and reception on the same TRP while minimizing self-interference through frequency separation, thus maintaining communication efficiency without suffering from severe self-interference.
Solution Approach 2:
Different spatial relationship information and beamforming parameters are applied locally to different sub-bands and transmission directions. The network node configures UE-specific spatial parameters that are optimized for each sub-band's directional requirements, allowing the best TRP to be used for both uplink and downlink while managing self-interference through localized spatial filtering.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a first transmit receive point (TRP) of a multi-TRP with a full-duplex mode, spatial relationship information associated with a sub-band full-duplex (SBFD) mode. The UE may transmit, to the first TRP or a second TRP of the multi-TRP, one or more communications using the spatial relationship information associated with the SBFD mode. Numerous other aspects are described.