PUCCH and SRS Resource Allocation in Subband Full Duplex Systems
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Solution Overview
Problem
In subband full duplex (SBFD) wireless communication systems, existing technologies face challenges in efficiently allocating frequency resources for uplink transmissions, leading to reduced throughput, increased latency, and limited coverage due to the overlap of uplink and downlink subbands in time division duplex (TDD) configurations.
Innovation Solution
The method involves receiving a physical uplink control channel (PUCCH) and sounding reference signal (SRS) resource configuration from a base station, which specifies separate frequency domain starting positions for SBFD and non-SBFD slots, allowing for periodic or semi-persistent transmissions and frequency hopping to ensure resource allocation within the uplink subband, thereby avoiding overlaps with downlink subbands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If TDD configuration with DL heavy ratio is used, then downlink capacity is improved, but uplink throughput and coverage are reduced
Solution Approach 1:
The frequency spectrum is divided into multiple subbands, and within each subband, time is divided into DL and UL portions. This segmentation allows simultaneous DL and UL transmissions in different subbands, effectively increasing UL throughput without reducing DL capacity while maintaining TDD flexibility.
Solution Approach 2:
The patent introduces a new dimension by enabling spatial frequency division within the time domain. Instead of only time-division multiplexing, the system now utilizes both time and frequency dimensions simultaneously, allowing UL and DL to coexist in the same time slot across different subbands.
2Productivity
If UL subband is introduced within DL slots, then uplink reception and downlink transmission can be performed simultaneously, but frequency resource allocation complexity increases
Solution Approach 1:
The frequency band is segmented into multiple subbands with designated UL and DL portions. This segmentation provides a structured framework for resource allocation, reducing complexity by pre-defining which subbands are available for UL transmissions in each slot, rather than requiring dynamic complex allocation algorithms.
Solution Approach 2:
Different subbands are assigned different qualities (UL or DL) based on local requirements. Each subband can be independently configured with its own UL/DL ratio and characteristics, allowing optimized local performance while maintaining overall system simplicity through modular design.
3Reliability
If periodic or semi-persistent PUCCH transmissions are performed across multiple slots, then control information reliability is improved, but latency increases
Solution Approach 1:
The PUCCH transmission is segmented across multiple slots with different frequency domain starting positions. This segmentation allows the control information to be distributed over time while maintaining reliability through repetition, and the latency is managed by optimizing the slot configuration and frequency hopping patterns.
Solution Approach 2:
The patent introduces dynamic frequency domain starting positions for PUCCH transmissions in SBFD slots versus non-SBFD slots. This dynamic adaptation allows the system to optimize between reliability and latency by selecting appropriate frequency positions based on the specific slot type and transmission requirements.
Data Source
AI summary
Mechanisms of uplink resource allocation in a subband full duplex (SBFD) system for transmissions of physical uplink control channel (PUCCH) and sounding reference signal (SRS) are disclosed. A PUCCH or SRS resource configuration can be received from a base station in the SBFD system. The PUCCH or SRS resource configuration can indicate, or provide parameters of, a first frequency domain starting position for PUCCH or SRS transmissions in SBFD slots and a second frequency domain position for PUCCH transmissions in non-SBFD slots. Periodic or semi-persistent PUCCH or SRS transmissions can be performed across multiple slots including SBFD slots and non-SBFD slots based on the PUCCH or SRS resource configuration. The periodic or semi-persistent PUCCH or SRS transmissions across the SBFD slots use the first frequency domain starting position. The periodic or semi-persistent PUCCH or SRS transmissions across the non-SBFD slots use the second frequency domain starting position.