HARQ Retransmission Timer Configuration for QoS Delay
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Solution Overview
Problem
The existing asynchronous HARQ retransmission mechanism in TD-SCDMA systems fails to guarantee the retransmission delay requirements of Quality of Service (QoS) for radio bearers, leading to potential unnecessary retransmissions due to inconsistencies between the network and UE sides.
Innovation Solution
Incorporating a retransmission timer parameter into the HARQ Profile of each MAC-d flow, which configures the retransmission timer value for the MAC-e PDU, allowing the UE to control retransmissions based on this timer and the maximum number of retransmissions, ensuring synchronized retransmission conditions at both ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If asynchronous HARQ retransmission mechanism is used in TD-SCDMA systems, then retransmission flexibility is improved, but retransmission delay requirements of QoS cannot be guaranteed
Solution Approach 1:
The patent introduces a retransmission timer parameter and maximum retransmission parameter into the HARQ Profile configuration. By dynamically controlling the retransmission timer value and maximum retransmission count, the system can balance between retransmission flexibility and delay guarantee, resolving the contradiction between adaptive retransmission and QoS delay requirements.
2Device complexity
If retransmission control is not synchronized between network and UE sides, then system complexity is reduced, but unnecessary retransmissions occur
Solution Approach 1:
The patent configures the retransmission timer and maximum retransmission parameters in advance through the HARQ Profile during radio bearer configuration. Both network and UE sides use these pre-configured parameters to independently control retransmissions, achieving synchronized behavior without complex real-time coordination, thus preventing unnecessary retransmissions while maintaining simple control architecture.
Data Source
AI summary
A repeat control method in enhanced uplink asynchronous hybrid automatic repeat request (HARQ) includes the following steps: (1) the network side adding a repeat timer parameter in the HARQ attribute of each dedicated media access control (MAC-d) entity flow, the user terminal setting the repeat timer value in the enhanced media access control (MAC-e) entity protocol data unit (PDU) according to the repeat timer parameter; (2) the user terminal performing the repeat control utilizing the repeat timer value in cooperation with the maximum repeat number. The wireless bearer QoS requirement and the cooperation working between the sender and the receiver are implemented.