Full-Duplex Link Adaptation With Subband-Specific MCS Tables
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing downlink (DL) and uplink (UL) transmissions in full-duplex systems, particularly in 5G/NR networks, due to the complexity of managing multiple frequency-domain subbands and conditions for valid receptions or transmissions.
Innovation Solution
The implementation of a method and apparatus that utilize separate modulation and coding scheme (MCS) tables for different frequency-domain subbands, allowing for conditional reception or transmission based on specific conditions, thereby optimizing DL and UL operations in full-duplex systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single MCS index table is used for both DL and UL transmissions in full-duplex systems, then device complexity is reduced, but spectral efficiency and throughput are degraded
Solution Approach 1:
The patent divides the single MCS table into two separate tables: a first MCS table for normal slots and a second MCS table for full-duplex slots. This segmentation allows each table to be optimized for its specific operational context, with the second table containing interference compensation parameters tailored for full-duplex conditions, thereby improving spectral efficiency without excessive complexity increase.
Solution Approach 2:
The patent introduces dynamic selection of MCS tables based on slot type. The UE determines whether to apply the first or second MCS table according to whether the current slot is a normal slot or a full-duplex slot. This dynamic adaptation enables the system to optimize modulation and coding parameters in real-time according to interference conditions, improving throughput while managing complexity through conditional logic.
2Ease of operation
If a single MCS index table is used for both DL and UL transmissions, then configuration simplicity is maintained, but latency increases
Solution Approach 1:
By segmenting the MCS table into table-specific configurations for normal and full-duplex slots, the patent enables more precise link adaptation. This reduces the time required for successful packet reception and retransmission, thereby reducing latency despite the increased configuration complexity.
Solution Approach 2:
The patent changes the MCS parameters (modulation order, coding rate) based on the slot type and interference conditions. In full-duplex slots, the second MCS table provides parameters that account for self-interference and uplink interference, enabling more reliable transmission at higher rates and reducing retransmission delays.
3Productivity
If separate MCS tables are used for different slot types, then spectral efficiency and throughput are improved, but device complexity increases
Solution Approach 1:
The patent segments the MCS configuration into two distinct tables with clear differentiation. The second MCS table specifically includes interference compensation parameters for full-duplex operations. This structured segmentation improves user throughput by providing optimized parameters while managing complexity through clear organization and separation of concerns.
Solution Approach 2:
The UE autonomously determines which MCS table to apply based on the slot type indication. The device self-manages the selection process by monitoring slot type and automatically applying the appropriate table, reducing the need for complex network control and simplifying overall system management despite having multiple tables.
4Object-affected harmful factors
If separate MCS tables are used for different slot types, then interference management is improved, but configuration complexity increases
Solution Approach 1:
The patent applies local quality by providing different MCS parameters tailored to specific slot types. The second MCS table contains interference compensation parameters specifically designed for full-duplex slots where self-interference and uplink interference are present. This localized optimization improves interference management while keeping the overall configuration manageable through clear differentiation.
Solution Approach 2:
The patent changes MCS parameters based on interference conditions associated with different slot types. The second MCS table includes adjusted modulation orders and coding rates that account for the interference environment in full-duplex slots. This parameter adaptation improves interference resilience while maintaining configuration complexity at acceptable levels through systematic parameter adjustment.
Data Source
AI summary
Methods and apparatuses for downlink and uplink transmissions in full-duplex systems. A method for operating a user equipment (UE) for receiving a physical downlink shared channel (PDSCH) includes receiving: first information for a first modulation and coding scheme (MCS) table associated with a first frequency-domain subband in a reception bandwidth on a cell, second information for a second MCS table associated with a second frequency-domain subband in the reception bandwidth, and third information for a condition. At least one of the first and second frequency-domain subbands is one of a subband full-duplex (SBFD) downlink (DL) subband, an SBFD flexible subband, or an SBFD uplink (UL) subband. The method further includes determining whether the condition is valid for reception in a slot or symbol and receiving the PDSCH in the slot or symbol based on the first MCS table when valid and the second MCS table when not valid.