HARQ Process Mapping for Component Carrier Reallocation
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Solution Overview
Problem
In LTE-A wireless communication systems, CC reallocation during HARQ transmission can lead to data loss and resource wastage due to the inability to associate retransmitted HARQ data with the new CC configuration, and delaying CC reallocation limits data transmission rate and flexibility.
Innovation Solution
Implementing a method where the access device maps the HARQ process and identifiers from the original CCs to the newly reassigned CCs using a signaling protocol, allowing continuous HARQ transmission without interruption during CC reallocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CC reallocation is performed during HARQ transmission, then data transmission flexibility and rate are improved, but data loss and resource wastage occur due to inability to associate retransmitted HARQ data with new CC configuration
Solution Approach 1:
The patent introduces CC mapping information as an intermediary mechanism that bridges the old CC configuration and new CC configuration. This mapping information is transmitted via downlink signaling and enables the UE to correctly associate HARQ retransmission data with the appropriate CC in the new configuration, thereby maintaining data integrity while allowing flexible CC reallocation.
Solution Approach 2:
The access node performs preliminary action by determining and signaling the CC mapping information before the UE performs HARQ retransmission on the newly allocated CCs. This advance preparation ensures that when HARQ retransmission occurs on reallocated CCs, the UE can correctly identify which CC to use based on the pre-signalized mapping relationship.
2Reliability
If CC reallocation is delayed to complete HARQ transmission, then data integrity is maintained, but data transmission rate and flexibility are reduced
Solution Approach 1:
The CC mapping information acts as an intermediary that allows HARQ processes to continue uninterrupted across CC reallocation. By providing the mapping relationship in advance, the system enables seamless transition of HARQ data to new CCs without requiring delay or interruption of the transmission process.
Solution Approach 2:
The patent ensures continuity of useful action by enabling HARQ transmission to proceed without interruption during CC reallocation. The UE uses the signaled CC mapping information to maintain continuous HARQ processes on the newly allocated CCs, eliminating the need to delay reallocation or interrupt ongoing transmissions.
3Productivity
If HARQ process sets are flexibly mapped to DL/UL component carriers, then frequency diversity gain and scheduling gain are improved, but additional bits for HARQ process set indication are required per CC
Solution Approach 1:
The CC mapping information serves multiple functions: it enables flexible CC reallocation, maintains HARQ data association, and supports frequency diversity gain. By creating a universal mapping mechanism that works across different CC configurations and HARQ processes, the system achieves scheduling flexibility without requiring separate indication mechanisms for each scenario.
Data Source
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AI summary
A method for supporting Hybrid Automatic Repeat Request (HARQ) transmission during component carrier (CC) reallocation. The method includes starting a HARQ process using a first CC, allocating a second CC, mapping the HARQ process from the first CC to the second CC, and transmitting remaining HARQ data associated with the HARQ process using the second CC. Also included is a method for supporting HARQ transmission during CC reallocation comprising starting a HARQ process using a first CC, determining to allocate a second CC, waiting until completion of the HARQ process using the first CC before allocating the second CC, and beginning another HARQ process on the second CC. Included is a method comprising starting a HARQ process using a first CC, allocating a second CC, discontinuing transmission using the first CC before completion of the HARQ process, and restarting new data using the second CC.