SBFD Uplink Scheduling During DRX Inactive Periods
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Solution Overview
Problem
The time division duplex (TDD) mode in cellular communication systems limits uplink transmission coverage due to the separation of downlink and uplink transmissions in the time domain, and existing network energy saving methods do not effectively utilize sub-band full duplex (SBFD) configurations to optimize resource availability and reduce energy consumption.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured with sub-band full duplex (SBFD) and cell discontinuous reception (DRX) to transmit packet data during inactive periods, utilizing SBFD resources for uplink transmission that may overlap with downlink transmissions or specific channels, and requesting additional resources as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If TDD mode separates DL and UL transmissions in time domain, then network energy saving is achieved, but uplink transmission coverage is limited
Solution Approach 1:
The patent divides the carrier bandwidth into multiple sub-bands, with specific sub-bands allocated for uplink transmission during DRX inactive periods. This segmentation allows uplink transmissions in frequency-domain separated regions while the rest of the system operates in energy-saving mode, thus extending uplink coverage without compromising overall network energy saving.
Solution Approach 2:
The patent transitions from time-domain separation (TDD) to frequency-domain separation (SBFD) for uplink transmissions. By utilizing SBFD resources in the frequency dimension during DRX inactive periods, the system enables uplink coverage extension without requiring additional time resources, effectively adding a frequency dimension to the energy-saving operation.
2Use of energy by stationary object
If cell DRX inactive period is extended for energy saving, then network energy consumption is reduced, but uplink transmission latency increases
Solution Approach 1:
The patent pre-configures SBFD resources for uplink transmission during DRX inactive periods before data arrives. When data needs to be transmitted with urgent latency requirements, the WTRU can immediately utilize these pre-configured resources without waiting for the next active period, thus reducing latency while maintaining energy saving benefits.
Solution Approach 2:
The patent dynamically adjusts the availability of SBFD resources based on latency requirements. When latency parameter exceeds DRX periodicity, the system activates SBFD uplink resources during inactive periods, effectively changing the operational parameters to balance energy consumption and transmission latency.
3Productivity
If SBFD resources are allocated for uplink during inactive periods, then resource utilization is optimized, but interference management complexity increases
Solution Approach 1:
The patent applies SBFD configuration to specific sub-bands rather than the entire carrier bandwidth. By limiting SBFD uplink transmissions to designated sub-bands during inactive periods, the system optimizes resource utilization in those specific frequency regions while minimizing interference impact on other sub-bands, thus reducing overall interference management complexity.
Data Source
AI summary
A method and wireless transmit/receive unit (WTRU) for enabling network energy saving using sub-band full duplex (SBFD) operation. The WTRU receives, from a gNode-B (gNB), a sub-band full duplex (SBFD) configuration. The WTRU receives, from the gNB, a cell discontinuous reception (DRX) configuration indicative of a cell DRX active period and a cell DRX periodicity. The WTRU then determinses that a latency parameter associated with packet data for transmission is longer than the cell DRX periodicity. The WTRU transmits, to the gNB, a request using a preconfigured uplink resource. The WTRU then receives, from the gNB, an indication of SBFD resources for uplink transmission during a cell DRX inactive period. The WTRU then transmits, to the gNB, the packet data using the SBFD resources for uplink transmission.