Downlink Bundled Data Transmission for Reduced Delay
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Solution Overview
Problem
In LTE systems, downlink data transmission can be unreliable due to repeated retransmissions of weak signals, leading to excessive delays in data transmission, particularly for scheduling and power control commands, which affects uplink/downlink data and measurement reporting.
Innovation Solution
A data transmission method where a base station configures user equipment to receive downlink bundled data by repeatedly transmitting the same data at least twice, either in time-domain or frequency-domain resources, or a combination of both, to improve reliability and reduce delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station repeatedly retransmits downlink data to improve reception reliability, then the reliability of data transmission is improved, but the transmission delay increases excessively
Solution Approach 1:
The patent applies frequency-domain bundling to transmit the same downlink data on multiple frequency resources (resource blocks) simultaneously. This dimensional change from time-domain retransmission to frequency-domain parallel transmission allows the UE to combine signals from multiple frequencies, improving reception reliability without increasing transmission delay, as all transmissions occur in the same time slot
2Reliability
If the base station uses conventional retransmission for weak signals, then the data can eventually be received, but the delay affects scheduled uplink/downlink data transmission
Solution Approach 1:
The patent configures the UE in advance with frequency-domain bundling reception capability through RRC signaling, including configuration parameters such as the number of frequency resources and resource allocation patterns. This preliminary configuration enables the UE to efficiently process bundled data without additional negotiation delays, improving overall transmission efficiency while maintaining reliability
3Reliability
If the base station retransmits PDCCH control signaling multiple times, then the control information can be received, but the delay affects power adjustment and measurement reporting timing
Solution Approach 1:
The patent merges multiple transmissions of the same PDCCH control signaling across different frequency resources into a single bundled transmission. The UE combines these frequency-domain repetitions to decode the control information more reliably. This approach ensures timely reception of power control commands and measurement reporting commands, maintaining the required timing for these operations without excessive retransmission delays
Data Source
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AI summary
Embodiments of the present invention provide a data transmission method and apparatus. The method includes: generating a configuration message, where the configuration message is used to configure, for user equipment UE, a function of receiving downlink bundled data, and the downlink bundled data is downlink data that is repeatedly transmitted at least twice; and sending the configuration message to the UE and sending the downlink bundled data to the UE. According to the data transmission method and apparatus provided in the embodiments of the present invention, downlink data is sent to user equipment in a downlink bundling manner, thereby shortening a delay of the downlink data transmission. If the downlink data is PDCCH control signaling, timeliness of an operation indicated by the PDCCH control signaling may also be improved. Further, a function of receiving downlink bundled data is flexibly configured and enabled for the UE, thereby preventing the UE from receiving, in all scenarios, the downlink data in a manner of receiving the downlink bundled data.