User Equipment Response Sequence for Sporadic Data Transmission
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Solution Overview
Problem
Establishing and maintaining uplink synchronization for sporadic small data packet transmissions in wireless communication systems is a major source of signaling overhead, which hinders energy efficiency and spectrum efficiency in user equipment and communication systems.
Innovation Solution
The user equipment determines a response sequence representing successful or unsuccessful data reception and transmits it to the network node without closed-loop uplink synchronization, allowing for reduced signaling overhead and energy consumption, and the network node can detect and separate these sequences without tight synchronization, using predetermined sequence sets and radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If closed-loop uplink synchronization is established and maintained for sporadic data packet transmissions, then reliable feedback transmission is achieved, but signalling overhead increases and energy consumption rises
Solution Approach 1:
The patent extracts the synchronization requirement from the feedback transmission process. Instead of maintaining continuous closed-loop uplink synchronization, the system uses downlink synchronization references that the UE can utilize for feedback transmission without establishing separate uplink synchronization procedures. This removes the harmful synchronization overhead while preserving feedback reliability.
Solution Approach 2:
The downlink synchronization signals serve multiple functions: they provide downlink timing synchronization for the UE and simultaneously serve as references for uplink feedback transmission timing. This multi-functionality eliminates the need for separate uplink synchronization signaling, reducing overall overhead while maintaining both downlink and uplink synchronization requirements.
2Measurement precision
If closed-loop uplink synchronization is established for sporadic packet transmissions, then synchronization accuracy is improved, but signalling overhead increases
Solution Approach 1:
The patent merges the downlink synchronization function with the uplink timing reference function. By using the downlink synchronization signals as the basis for both downlink reception timing and uplink feedback timing, the system combines multiple synchronization requirements into a single signaling mechanism, thereby maintaining synchronization accuracy while minimizing signaling overhead.
Solution Approach 2:
The network provides downlink synchronization signals in advance that contain timing information that the UE can use for subsequent uplink feedback transmissions. This preliminary provision of synchronization references eliminates the need for continuous uplink synchronization signaling, as the UE can autonomously determine uplink timing based on the pre-received downlink synchronization information.
Data Source
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AI summary
It is proposed a method to operate a user equipment (UE) operable in a radio communications network, the method comprising: receiving data (10) from a network node (BS); determining whether the data (10) has been received successfully, determining a response sequence (14) in response to the successful or unsuccessful reception of the data (10), wherein the response sequence (14) as a whole represents the information, whether the reception of the data (10) by the user equipment (UE) was successful or unsuccessful. The response sequence (14) is transmitted to the network node (BS).