Subband Full Duplex Uplink Scheduling for TDD Capacity Limits
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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.
Innovation Solution
A method and apparatus support sub-band full duplex by configuring terminals with SBFD information, allowing periodic uplink transmissions based on RRC reconfiguration, and determining symbol sets for SBFD operations within a BWP, enabling simultaneous downlink and uplink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDD is used to allocate limited time duration for uplink, then downlink and uplink can be separated in time domain, but coverage is reduced, latency is increased and capacity is reduced
Solution Approach 1:
The patent segments the frequency band into multiple subbands, allowing different subbands to be used for downlink and uplink simultaneously. This segmentation enables full duplex operation in specific subbands while maintaining TDD in others, thereby increasing uplink capacity without completely abandoning time-division separation.
Solution Approach 2:
The patent transitions from purely time-domain separation (TDD) to frequency-domain separation by introducing subband full duplex. This dimensional change allows simultaneous downlink and uplink operations in different frequency subbands, effectively adding a frequency dimension to the resource allocation strategy and increasing overall system capacity.
2Productivity
If TDD is used to allocate limited time duration for uplink, then time domain resources can be separated, but latency is increased
Solution Approach 1:
By segmenting the frequency spectrum into subbands and enabling full duplex in specific subbands, the patent allows uplink transmissions to occur simultaneously with downlink in other subbands. This reduces the waiting time for uplink transmissions and thereby decreases latency while maintaining overall system capacity.
Solution Approach 2:
The patent enables continuous uplink transmission opportunities through subband full duplex, eliminating the periodic interruptions inherent in TDD. Uplink transmissions can occur continuously in the designated subbands without waiting for allocated uplink time slots, thus reducing latency and improving the continuity of useful communication actions.
3Productivity
If TDD is used to allocate limited time duration for uplink, then time resources can be divided, but coverage is reduced
Solution Approach 1:
The patent moves the resource allocation strategy from time-domain division to frequency-domain division by implementing subband full duplex. This allows uplink capacity to be increased through frequency multiplexing rather than time multiplexing, enabling better coverage since users don't need to wait for specific time slots to transmit, thus expanding the effective coverage area.
Data Source
AI summary
A method and apparatus to support sub-band full duplex is provided. In the method, the terminal receives system information including SBFD configuration; the terminal receives RRC reconfiguration message including configuration information for periodic uplink transmission; the terminal determines set of symbols for periodic uplink transmission based on RRC reconfiguration message; the terminal performs periodic uplink transmission for a BWP on the uplink symbols and the SBFD symbols in case that the BWP is S-BWP and a specific indication is configured for the periodic uplink transmission.