Wireless Node Uplink Cancellation via PDCCH Symbol Group Mapping
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Solution Overview
Problem
The challenge of enhancing uplink transmission cancellation in wireless communication systems, particularly in scenarios with mixed symbol types indicated by RRC signaling, is addressed to improve performance and reduce hardware complexity across various communication scenarios.
Innovation Solution
A method involving RRC signaling and PDCCH is employed to define G symbol groups, where uplink transmissions are canceled based on bit sets, ensuring efficient cancellation of uplink transmissions on symbols indicated as downlink by RRC signaling, utilizing DCI format 2_4 and tdd-UL-DL-ConfigurationCommon for flexible scheduling and resource assignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If symbols indicated as downlink by RRC signaling are used for uplink transmission, then uplink capacity is improved, but transmission reliability deteriorates due to potential interference
Solution Approach 1:
The system performs preliminary classification of symbols into first-type and second-type symbols before uplink transmission. First-type symbols (which can be safely used for uplink) are identified and marked in advance through the first information block, allowing the UE to preemptively know which symbols are safe for uplink transmission without interference, thus improving both capacity and reliability
Solution Approach 2:
The first information block acts as an intermediary mechanism that bridges the RRC downlink symbol indication and the actual uplink transmission decision. It provides an additional layer of control by classifying symbols and indicating their uplink availability, resolving the conflict between capacity improvement and reliability maintenance
2Adaptability or versatility
If G bit sets are mapped to G symbol groups for cancellation indication, then scheduling flexibility is improved, but signaling complexity increases
Solution Approach 1:
The signaling is segmented into G bit sets, each corresponding to a specific symbol group. This segmentation allows flexible cancellation indication for different symbol groups independently, improving scheduling flexibility while keeping each bit set's processing complexity manageable through structured organization
Solution Approach 2:
The first signaling with G bit sets serves multiple functions: it indicates cancellation for different symbol groups, provides granular control over uplink transmission, and maintains compatibility with existing RRC configurations. This multi-functionality achieves scheduling flexibility without proportionally increasing complexity
Data Source
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AI summary
Disclosed in the present application are a method and apparatus used in a node for wireless communications. A first receiver receives first RRC signaling and a first information block; and the first receiver receives first signaling in a first PDCCH, wherein the first signaling comprises G bit sets, and a first bit set is one of the G bit sets. The G bit sets are mapped to G symbol groups on a one-to-one basis, and a first symbol group is a symbol group, to which the first bit set is mapped, among the G symbol groups; a condition that a first-type transmission, which occupies at least one symbol in the first symbol group, is cancelled is based on at least one bit in the first bit set, wherein the first-type transmission is an uplink transmission; and any one of the G symbol groups comprises at least one first-type symbol, and whether at least one symbol, which is indicated to be a downlink symbol by the first RRC signaling, is a first-type symbol depends on the first information block.