Subband Full Duplex BWP Switching for TDD Uplink Capacity
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Solution Overview
Problem
TDD systems in wireless mobile communication face challenges with reduced coverage, increased latency, and reduced capacity due to limited uplink time duration, which can be addressed by implementing sub-band full duplex (SBFD) to enable simultaneous downlink and uplink operations within a conventional TDD band.
Innovation Solution
A method and apparatus support sub-band full duplex by configuring terminals to receive system information, perform BWP switching based on DCI, and determine available symbols for reception and transmission, allowing for SBFD operations while minimizing interference with existing TDD systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDD time domain resource is split between downlink and uplink, then downlink and uplink can be separated in time, but uplink coverage is reduced, latency increases and capacity is reduced
Solution Approach 1:
The patent divides the frequency band into multiple subbands, with specific subbands allocated for uplink transmission while other subbands can simultaneously carry downlink transmissions. This segmentation allows the system to overcome the time-splitting limitation of traditional TDD by creating frequency-domain pathways for simultaneous uplink capacity enhancement without interfering with downlink operations.
Solution Approach 2:
The patent transitions from time-domain separation (single dimension) to frequency-domain separation (adding another dimension). By utilizing subband full duplex technology, the system operates in both uplink and downlink simultaneously across different frequency subbands, effectively adding a frequency dimension to the traditional time-domain TDD structure, thereby increasing uplink capacity and reducing latency without compromising downlink performance.
2Productivity
If subband full duplex is implemented to enable simultaneous downlink and uplink operations, then coverage and capacity are enhanced, but interference management complexity increases
Solution Approach 1:
The patent applies local quality by assigning different transmission characteristics to different frequency subbands. Specific subbands are designated for uplink while others handle downlink, allowing each subband to have optimized quality parameters tailored to its direction. This localized approach simplifies interference management compared to system-wide complex coordination, as interference can be controlled at the subband level rather than requiring global interference management.
Solution Approach 2:
The patent enables dynamic subband allocation and switching, where the base station can flexibly assign uplink and downlink subbands based on real-time traffic conditions and interference levels. This dynamic adaptation allows the system to optimize performance while managing interference complexity through automated, condition-based resource allocation rather than static complex configurations.
3Productivity
If BWP switching is performed to support SBFD operations, then resource utilization is optimized, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent designs the BWP switching mechanism to serve multiple functions simultaneously: it enables subband full duplex operation, optimizes resource allocation for different traffic types, and manages interference coordination. By making the BWP switching mechanism multi-functional, the patent reduces the need for separate dedicated mechanisms for each function, thereby optimizing resource utilization while controlling overall system complexity through a unified approach.
Data Source
AI summary
A method and apparatus to support sub-band full duplex is provided. In the method, the terminal receives from a base station a system information; the terminal receives from the base station a RRCReconfiguration; the terminal receives from the base station a DCI that causes BWP switching; the terminal determines symbols available for reception and symbols available for transmission; and the terminal performs reception on symbols for reception and transmission on symbols for transmission. receives RAR based on the PDCCH. If the SBFD UL subband overlaps with the BWP, SBFD symbols are available for transmission. If the SBFD DL subband overlaps with the BWP, SBFD symbols are available for reception.