Downlinking Data to Unsynchronized User Equipment
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Solution Overview
Problem
Current telecommunications networks face challenges in minimizing user plane delay for unsynchronized User Equipment (UE) in LTE Advanced systems, as they cannot transmit Hybrid Automatic Repeat Request (HARQ) feedback without synchronization, leading to inefficient data transmission and increased latency.
Innovation Solution
A method and system that allow downlink data transmission to unsynchronized UE by initiating a random access procedure and sending HARQ transmissions before synchronization, enabling cumulative HARQ feedback once the UE is synchronized, thereby reducing latency and maintaining HARQ protocol robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission to unsynchronized UE is delayed until synchronization is achieved, then transmission reliability is improved, but user plane latency increases
Solution Approach 1:
The patent applies preliminary action by transmitting downlink data to the UE before synchronization is fully established. The eNB sends data in advance during the random access procedure, allowing the UE to receive data immediately rather than waiting for complete synchronization. This reduces user plane latency while maintaining reliability through subsequent HARQ feedback after synchronization is achieved.
2Loss of time
If HARQ feedback is transmitted before UE synchronization, then latency is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent uses preliminary action by sending data before synchronization is complete, then follows up with HARQ feedback after synchronization is achieved. This sequence allows the system to minimize latency by not waiting for synchronization before transmitting data, while still ensuring reliability through the subsequent HARQ mechanism once the UE is synchronized.
Solution Approach 2:
The patent applies feedback by implementing HARQ acknowledgment transmission after the UE achieves synchronization. The UE sends HARQ feedback messages to the eNB once synchronized, allowing the system to verify successful data reception and request retransmissions if necessary. This feedback mechanism ensures transmission reliability while maintaining low latency through the preliminary data transmission.
3Reliability
If multiple blind retransmissions are sent to unsynchronized UE, then transmission reliability is improved, but resource efficiency worsens
Solution Approach 1:
The patent applies feedback by implementing HARQ acknowledgment transmission after the UE achieves synchronization. The UE sends HARQ feedback messages to the eNB once synchronized, allowing the system to verify successful data reception and request retransmissions if necessary. This feedback mechanism ensures transmission reliability while maintaining low latency through the preliminary data transmission.
Solution Approach 2:
The patent uses partial action by sending only the necessary number of retransmissions based on actual UE reception needs, rather than always sending a fixed number of blind retransmissions. The eNB transmits data and then uses HARQ feedback to determine whether retransmissions are actually needed, avoiding unnecessary resource consumption while ensuring reliable delivery.
Data Source
AI summary
A system, method and node of downlinking transmissions to an unsynchronized UE in a telecommunications network. The method begins by a node in the network requesting synchronization of the UE with the network. A first transmission of data is sent from the node to the UE prior to synchronization of the UE. The UE then synchronizes with the network by the UE performing a Random Access procedure with the node, thereby triggering a time alignment command from the node to the UE to synchronize the UE with the network. A second transmission of data is then sent from the node to the UE after the UE is synchronized. A response feedback message is sent to the node from the UE. The message is a cumulative feedback message of the first transmission of data and the second transmission of data. Thus, data may be transmitted prior to synchronization of the UE.