Sub-band Full Duplex Frequency Adjustment for Interference Mitigation
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Solution Overview
Problem
In wireless communications, sub-band full duplex (SBFD) systems face challenges in handling conflicts between uplink and downlink messages within the same SBFD slot, leading to potential interference and reduced network efficiency.
Innovation Solution
A user equipment (UE) performs an adjustment procedure for frequency resources of uplink or downlink messages to avoid collisions within an SBFD slot. This involves identifying overlapping resource allocations and either selecting non-overlapping resources, shifting resource allocations within sub-bands, or both.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency resources for uplink and downlink messages are allocated within the same SBFD slot, then spectrum efficiency is improved, but interference between uplink and downlink messages occurs
Solution Approach 1:
The frequency spectrum within an SBFD slot is segmented into distinct uplink sub-bands and downlink sub-bands. The method divides the available frequency resources into separate allocation regions for uplink messages and downlink messages, allowing simultaneous transmission while preventing interference through frequency domain separation.
Solution Approach 2:
The patent resolves the time-domain conflict by transitioning to frequency-domain resource allocation. Instead of separating uplink and downlink in time (TDMA), the method allocates specific frequency sub-bands for each direction within the same time slot, effectively moving the resolution from one dimension (time) to another dimension (frequency).
2Productivity
If resource allocations for uplink and downlink messages overlap in frequency domain, then frequency resource utilization is improved, but collision between messages occurs
Solution Approach 1:
The patent applies local quality by assigning different frequency resource characteristics to different message types. Specific sub-bands are designated with particular qualities (uplink-oriented or downlink-oriented) based on their allocation patterns, allowing each message to access resources optimized for its direction while avoiding collisions through differentiated local resource properties.
3Object-affected harmful factors
If frequency resources are adjusted to avoid overlap, then interference is reduced, but resource allocation complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring frequency sub-band allocations for uplink and downlink messages before actual transmission occurs. The network entity establishes predetermined resource allocation patterns that automatically prevent overlaps, eliminating the need for complex real-time adjustment mechanisms during message transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, a user equipment (UE) may perform an adjustment procedure for one or more frequency resources of an uplink message or a downlink message to avoid collisions within a sub-band full duplex (SBFD) slot. In some cases, the UE may identify that a resource allocation for the downlink message extends over at least a portion of a resource allocation for the uplink message (or a guard band for the uplink message), and may perform the adjustment procedure for the uplink resource allocation. The adjustment procedure may include only using resources of the uplink resource allocation that do not overlap resources of the downlink resource allocation, shifting the uplink resource allocation within an uplink sub-band, or both. Additionally, or alternatively, such techniques may be extended to adjust the downlink resource allocation, for example, based on a type of the downlink message.