HARQ Process Mapping for Semi-Persistent VoIP Resources
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Solution Overview
Problem
In mobile communication systems using Hybrid Automatic Repeat reQuest (HARQ) for Voice over Internet Protocol (VoIP) services, there is a challenge in correctly identifying and combining HARQ packets due to the lack of Layer 1/Layer 2 control information in initial transmissions, leading to difficulties in soft-combining retransmitted packets with the corresponding stored packets, especially when persistent resource intervals expire before retransmissions are completed.
Innovation Solution
The solution involves pre-agreeing on a persistent resource-dedicated HARQ process identifier between the User Equipment (UE) and the Evolved Node B (ENB) during call setup, allowing for correct identification and soft-combining of HARQ packets by using a predetermined rule for mapping packets received through persistent resources to their corresponding HARQ processes, even in the absence of initial L1/L2 control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If persistent resources are used for HARQ initial transmission without L1/L2 control information, then resource allocation efficiency is improved, but the ability to correctly identify and soft-combine retransmitted packets deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring HARQ process identifiers and establishing mapping rules between persistent resources and HARQ processes before data transmission begins. This allows the system to maintain efficient persistent resource allocation while ensuring that retransmitted packets can be correctly identified and combined through pre-established identification mechanisms.
2Loss of time
If persistent resource intervals are shortened to improve responsiveness, then service latency is reduced, but the completion of HARQ retransmission operations becomes more difficult
Solution Approach 1:
The patent applies dynamics by enabling flexible HARQ process management that can adapt to varying resource interval conditions. The system dynamically tracks and identifies HARQ processes across persistent resource intervals, allowing it to maintain reliable packet identification and soft-combining operations even when resource intervals are shortened to reduce latency.
3Productivity
If multiple HARQ packets are received through persistent resources at arbitrary timing, then resource utilization is improved, but the complexity of determining correct soft-combining targets increases
Solution Approach 1:
The patent introduces an intermediary mapping mechanism that serves as a bridge between persistent resources and HARQ processes. This mapping rule acts as an intermediary structure that simplifies the relationship between multiple received packets and their corresponding soft-combining targets, reducing the complexity of packet identification while maintaining high resource utilization.
Data Source
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AI summary
A method for receiving data in a communication system, the method comprising: acquiring a number of hybrid automatic repeat request, HARQ, processes of a semi-persistent resource allocation and semi-persistent resource allocation interval information; acquiring a HARQ process identifier, ID, using the number of HARQ processes of the semi-persistent resource allocation, the semi-persistent resource allocation interval information, and time information; acquiring soft buffer information; and receiving data in a first transmission based on the semi-persistent resource allocation, the HARQ process ID, and the soft buffer information.