LTE TTI Bundling HARQ RTT Adjustment
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Solution Overview
Problem
Current TTI bundling methods in LTE wireless communication systems lead to unnecessary retransmissions and inefficient use of radio resources due to fixed HARQ RTT lengths and acknowledgement signal generation based on last or first packet decoding results, resulting in wasted resources and reduced transmission rates.
Innovation Solution
A method where the second bundle is transmitted at a specific multiple of the HARQ RTT after the first bundle, allowing immediate retransmission of the first bundle without prolonging the HARQ RTT, and generating acknowledgement signals based on the decoding results of all packets in a bundle to optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acknowledgement signal is generated based on decoding result of last packet of bundle, then reception status can be determined, but unnecessary retransmissions occur and radio resources are wasted
Solution Approach 1:
The patent segments the bundle acknowledgement mechanism by individually evaluating each packet's decoding result rather than relying solely on the last packet. This allows selective acknowledgement where only packets that failed decoding are marked for retransmission, preventing unnecessary bundle retransmissions while maintaining reliable reception status indication.
2Ease of manufacture
If fixed HARQ RTT length is used, then implementation is simplified, but transmission time is wasted when retransmission is needed
Solution Approach 1:
The patent introduces dynamic HARQ RTT adjustment where the RTT duration is extended only when retransmission is actually needed. The network side determines whether to extend RTT based on packet decoding results and retransmission requirements, transforming the fixed RTT mechanism into a dynamic one that adapts to actual transmission conditions.
3Reliability
If bundle retransmission process is implemented, then transmission reliability is improved, but radio resources are wasted due to lack of efficiency
Solution Approach 1:
The patent implements an enhanced feedback mechanism where the network side provides detailed decoding results for each packet in the bundle. This feedback information enables the UE to identify which specific packets need retransmission rather than retransmitting the entire bundle, significantly reducing radio resource waste while maintaining transmission reliability.
Data Source
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AI summary
A method for improving transmission time interval bundling transmission in a wireless communication system (1000) includes transmitting a first bundle at a first time point (502), and transmitting a second bundle at a second time point behind the first time point, wherein the second time point is located in a bundle round trip time of the first bundle, and the bundle round trip time is a specific multiple of a Hybrid Automatic Repeat Request Round Trip Time (504).