Wireless Duplex Slot Validation for Dynamic TDD Subbands
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently allocating and mapping radio resources for uplink channels in duplex operations, particularly in dynamic TDD and SubBand Full Duplex (SBFD) scenarios, where simultaneous downlink and uplink transmissions occur.
Innovation Solution
The technology involves wireless terminals and access nodes that communicate through a radio interface, utilizing receiver and transmitter circuitry to transmit and receive slot format and validation information for uplink subbands, enabling validation or invalidation of transmission direction configurations for improved resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic TDD operation with flexible regions is implemented, then adaptability of radio resource allocation is improved, but complexity of transmission direction configuration is worsened
Solution Approach 1:
The frequency band is segmented into multiple subbands, and each subband can be independently configured with different transmission directions (downlink, uplink, or flexible). This segmentation allows the system to achieve adaptability in radio resource allocation while managing complexity through localized control of each subband rather than the entire frequency band.
Solution Approach 2:
The transmission direction of flexible regions can be dynamically changed from downlink to uplink or vice versa based on real-time traffic conditions. This dynamic reconfiguration capability improves adaptability of the system while the validation mechanism ensures that complexity is managed through controlled transitions.
2Productivity
If SubBand Full Duplex operation is introduced, then productivity of simultaneous uplink and downlink transmissions is improved, but reliability of transmission direction configuration is worsened
Solution Approach 1:
A validation mechanism is introduced that provides feedback to the terminal about the correct transmission direction configuration for each subband. This feedback loop ensures that the terminal accurately interprets the transmission direction, thereby maintaining reliability while enabling simultaneous uplink and downlink transmissions in different subbands.
Solution Approach 2:
Different subbands can have different transmission directions configured simultaneously (some subbands for downlink, others for uplink). This local quality approach allows full duplex operation to proceed in multiple subbands at the same time, improving overall productivity while maintaining reliable configuration through localized validation.
3Reliability
If validation information is added to slot format information, then reliability of transmission direction configuration is improved, but device complexity of information processing is worsened
Solution Approach 1:
The validation information is merged with the existing slot format information structure. Rather than adding a completely separate validation mechanism, the validation bits are integrated into the slot format indication, allowing the terminal to process both the transmission direction and validation information together, thereby improving reliability while minimizing the increase in device complexity.
Data Source
AI summary
A wireless terminal communicates across a radio interface with a radio access network. The wireless terminal comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive from the radio access network (1) slot format information comprising transmission direction configuration for each symbol in a slot for an uplink (UL) subband; and (2) validation information. The processor circuitry is configured to use the validation information to perform validation or invalidation of the transmission direction configuration for at least a portion of the UL subband.