Uplink Beam Management for Subband Full Duplex Interference
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Solution Overview
Problem
Wireless communication systems face challenges in managing uplink spatial relation information in subband full duplex (SBFD) resources due to interference from downlink transmissions, requiring adaptive beam management to optimize uplink transmissions.
Innovation Solution
User equipment (UE) and network entities selectively enable or restrict uplink beams based on SBFD resource type, using multiple beams for half-duplex and SBFD resources, and employing control signaling to schedule and monitor uplink transmissions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single uplink beam is configured for both HD and SBFD resources, then device complexity is reduced, but uplink transmission reliability deteriorates due to interference from downlink transmissions in SBFD resources
Solution Approach 1:
The patent segments the uplink beam configuration into two distinct parts: one beam configuration for HD uplink resources and another for SBFD resources. This allows the UE to use different beams optimized for each resource type, with the SBFD beam specifically designed to handle interference from concurrent downlink transmissions, thereby improving uplink transmission reliability in SBFD resources while maintaining manageable device complexity through structured configuration.
2Reliability
If multiple uplink beams are configured for different resource types, then uplink transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic beam selection where the UE automatically chooses the appropriate beam based on the resource type (HD or SBFD). The network entity dynamically indicates which beam to use through control signaling, and the UE adapts its transmission accordingly. This dynamic approach maintains high reliability by using the right beam for each resource type while managing complexity through automated selection rather than manual configuration of multiple beams.
Solution Approach 2:
The patent creates a universal beam configuration framework where a single set of beam configurations serves multiple purposes: one beam handles HD resources while another handles SBFD resources. The control signaling mechanism provides a universal interface for the network to indicate beam selection, and the UE uses a universal decision-making process to select the appropriate beam based on resource type, thereby managing complexity through multi-functional design.
3Productivity
If uplink transmissions are performed in SBFD resources, then productivity is improved, but harmful factors increase due to self-interference from downlink transmissions
Solution Approach 1:
The patent applies local quality by configuring a specific uplink beam for SBFD resources that is optimized for the local interference conditions. This beam is specifically designed to mitigate self-interference from concurrent downlink transmissions in the same time slot. By tailoring the beam characteristics (direction, gain, nulling) to the specific interference environment of SBFD resources, the system enables productive uplink transmissions while minimizing the harmful effects of self-interference.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may perform or cancel an uplink transmission in a subband full duplex (SBFD) resource based on whether the indicated uplink beam is enabled or restricted for SBFD. A network entity may monitor for or refrain from monitoring for an uplink transmission in an SBFD resource based on whether the indicated uplink beam is enabled or restricted for SBFD. A UE may be configured with a first uplink beam for half-duplex uplink resources and a second uplink beam for SBFD resources. The UE may perform uplink transmissions scheduled in SBFD resources using the first uplink beam. A UE may use a single uplink beam configured for both half-duplex uplink resources and SBFD resources, or a single uplink beam may be configured and restricted from SBFD resources, and the UE may cancel a scheduled transmission in an SBFD resource.