Sub-band Full Duplex AGC Headroom Power Adjustment
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing automatic gain control (AGC) for sub-band full duplex (SBFD) transmissions, leading to hardware saturation and interference issues due to cross-link interference (CLI).
Innovation Solution
The method involves a network node receiving an AGC headroom capability from a user equipment (UE) and adjusting the transmission power level for an uplink transmission from another UE to mitigate inter-UE CLI. Additionally, UEs can transmit their AGC headroom capabilities and receive adjustments based on CLI metrics calculated by the network node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission power level is increased to improve signal quality, then signal quality is improved, but cross-link interference between UEs increases
Solution Approach 1:
The patent applies local quality by adjusting the transmission power level specifically for uplink transmissions in sub-bands where downlink transmissions are occurring, rather than uniformly across all frequencies. The network node identifies specific sub-bands and UEs involved in CLI and applies targeted power adjustments only to those specific transmissions, leaving other transmissions unaffected.
Solution Approach 2:
The patent changes the transmission power level parameter dynamically based on AGC headroom capability and CLI conditions. The network node modifies the power level parameter for specific uplink transmissions to mitigate interference while maintaining signal quality, using feedback from AGC headroom reports to adjust this parameter in real-time.
2Object-generated harmful factors
If transmission power level is adjusted to reduce inter-UE CLI, then cross-link interference is reduced, but signal quality may deteriorate
Solution Approach 1:
The patent implements feedback through AGC headroom capability reporting. UEs report their AGC headroom capability to the network node, which uses this feedback information to make informed decisions about transmission power adjustments. This feedback loop enables the network to balance CLI reduction with signal quality maintenance by adapting power levels based on actual UE conditions.
Solution Approach 2:
The patent applies dynamics by making transmission power levels adjustable and adaptive rather than fixed. The network node dynamically modifies power levels based on real-time conditions including AGC headroom capability and CLI metrics, allowing the system to optimize both interference reduction and signal quality under varying conditions.
3Object-generated harmful factors
If AGC headroom capability is considered for power adjustment, then inter-UE CLI is mitigated, but device complexity increases
Solution Approach 1:
The patent applies self-service by having UEs autonomously measure and report their own AGC headroom capability to the network node. Each UE independently assesses its own reception conditions and communicates this information, eliminating the need for complex network-side measurements and reducing overall system complexity while still enabling CLI mitigation.
Solution Approach 2:
The patent implements preliminary action by having UEs report their AGC headroom capability before actual transmissions occur. This advance information allows the network node to pre-calculate and configure appropriate power adjustment parameters, simplifying the control process and avoiding complex real-time calculations during active transmissions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may receive an automatic gain control (AGC) headroom capability that is supported by a first user equipment (UE). The network node may adjust, based at least in part on the AGC headroom capability, a transmission power level for an uplink transmission from a second UE that is transmitted in a same orthogonal frequency division multiplexing (OFDM) symbol as a downlink transmission to the first UE. Numerous other aspects are described.