Time-Frequency Resource Continuity in URLLC Transmission
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Solution Overview
Problem
In ultra-reliable and low-latency communications (URLLC) systems, the discontinuity of time-frequency resources in the time domain leads to unnecessary uplink transmission cancellation or downlink transmission interruption, reducing network capacity.
Innovation Solution
A communication method and apparatus that determine N time-frequency resource groups, receive transmission indication information with a bit sequence indicating the status of each group, and adjust data transmission based on the status to ensure continuity of time-frequency resources, thereby avoiding unnecessary cancellations or interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink CI is used to cancel transmission on time-frequency resources that cross downlink symbols, then transmission reliability is improved, but network capacity is reduced due to unnecessary cancellations
Solution Approach 1:
The patent segments the time-frequency resource into multiple parts separated by downlink symbols. Instead of treating the entire resource as one unit that must be canceled, the system divides it into segments before and after the downlink symbol, allowing selective cancellation of only the necessary parts while preserving others.
Solution Approach 2:
The patent applies different transmission statuses to different parts of the time-frequency resource. The bit sequence allows indicating different statuses (cancel or maintain) for resources before and after downlink symbols, enabling localized control rather than uniform cancellation across the entire resource.
2Productivity
If time-frequency resources are continuously allocated across downlink symbols, then network capacity is increased, but transmission reliability deteriorates due to crossing downlink symbols
Solution Approach 1:
The patent performs preliminary identification of downlink symbols within time-frequency resources before transmission. By detecting and marking these symbols in advance, the system can proactively adjust transmission status to avoid reliability issues while maintaining continuous resource allocation for capacity.
Solution Approach 2:
The patent introduces dynamic adjustment of transmission status based on the presence of downlink symbols. The bit sequence enables flexible, adaptive control where transmission can be canceled or maintained in different segments depending on the specific configuration, rather than using a fixed approach.
3Reliability
If uplink transmission is canceled to ensure reliability, then transmission reliability is improved, but resource utilization decreases
Solution Approach 1:
The patent applies partial cancellation rather than complete cancellation of uplink transmission. By using the bit sequence to indicate cancellation status for specific segments (before/after downlink symbols), the system cancels only the necessary portions while maintaining transmission in other segments, achieving reliability without excessive resource loss.
Data Source
AI summary
This application relates to the field of communications technologies, and discloses a communication method and apparatus. The method includes: when a terminal device determines transmission statuses of N time-frequency resource groups based on transmission indication information sent by a network device, if a time-frequency resource group is separated into a former half and a latter half by one or more first symbols in time domain, the former half of the time-frequency resource group may be combined into a previous time-frequency resource group of the time-frequency resource group, or the latter half of the time-frequency resource group may be combined into a next time-frequency resource group of the time-frequency resource group, to determine a transmission status. This ensures continuity, in time domain, of the time-frequency resource group indicated by the transmission indication information, and can avoid unnecessary uplink transmission cancellation or downlink transmission interruption, thereby increasing a network capacity.