Control Information Signaling for Selective Data Retransmission
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Solution Overview
Problem
Existing feedback-based retransmission mechanisms in communications systems increase data transmission latency and reduce network throughput, especially in scenarios where only a small part of the data is affected by interference, due to the need for all data to be retransmitted based on feedback from the receiving device.
Innovation Solution
The proposed solution involves a control information sending and receiving method that allows for the efficient transmission of affected data by using control information to indicate whether data is initially transmitted or retransmitted, and to combine and decode data on affected time-frequency resources, thereby reducing the need for full retransmission and improving latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a time-frequency resource allocated to a victim service is occupied or multiplexed to transmit URLLC service, then the transmission latency of URLLC service is reduced, but the reliability of transmitting the scheduled victim service is reduced
Solution Approach 1:
The patent segments the data transmission by identifying and separating affected data from unaffected data. When URLLC service occupies or multiplexes victim service resources, only the affected portions of victim service data are identified and marked for retransmission, rather than retransmitting all data. This segmentation allows selective handling of impacted data segments.
Solution Approach 2:
The patent applies partial action by triggering retransmission only for affected data when resource occupation or multiplexing occurs, rather than retransmitting all scheduled data. The sending device determines which specific data portions are affected by the URLLC service and initiates retransmission only for those portions, reducing unnecessary retransmissions and improving overall system efficiency.
2Reliability
If retransmission is triggered based on feedback information, then data transmission reliability is improved, but data transmission latency increases
Solution Approach 1:
The patent implements preliminary action by proactively triggering retransmission when the sending device determines that resource occupation or multiplexing will affect data transmission, rather than waiting for feedback from the receiving device. The sending device predicts potential decoding failures and initiates retransmission in advance, eliminating the need to wait for feedback information and reducing transmission latency.
Solution Approach 2:
The patent applies skipping by bypassing the traditional feedback-based retransmission delay. Instead of waiting for the receiving device to decode and send feedback, the sending device skips the feedback waiting period by proactively determining affected data and triggering retransmission immediately, thus rushing through the retransmission process faster.
3Reliability
If all data is retransmitted when decoding fails, then data transmission reliability is improved, but network throughput is reduced
Solution Approach 1:
The patent segments the retransmission process by identifying only the affected data portions that require retransmission, rather than retransmitting all scheduled data. When URLLC service occupies or multiplexes victim service resources, the sending device determines which specific data segments are affected and triggers retransmission only for those segments, leaving unaffected data to proceed without retransmission.
Solution Approach 2:
The patent applies partial action by performing retransmission only on affected data portions rather than all data. This selective retransmission approach maintains data transmission reliability for affected portions while avoiding unnecessary retransmissions of unaffected data, thus preserving network throughput and system efficiency.
Data Source
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AI summary
Embodiments of this application provide a control information sending method and apparatus. The method includes: sending, by a network device, first control information to a terminal device, where the first control information includes first indication information and information about a first time-frequency resource, the first time-frequency resource carries at least first data, the first data includes a first bit obtained by encoding a first information block, and the first indication information is used to indicate initial transmission or retransmission of the first information block; and sending, by the network device, second control information to the terminal device, where the second control information includes second indication information and information about a second time-frequency resource, the second time-frequency resource carries at least second data, the second data includes a second bit obtained by encoding the first information block, and the second indication information is used to indicate that feedback information for the first information block is determined based on a result of combining and decoding the first data and the second data. In this way, a data transmission latency can be reduced.