Terminal HARQ Combining Across Serving Cell Changes
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Solution Overview
Problem
In current communication protocols, during a serving cell change, the terminal discards HARQ entity data from the source serving cell, leading to increased retransmissions and loss of data continuity.
Innovation Solution
The terminal combines and decodes unsuccessfully decoded data from the source serving cell with retransmitted data from the target serving cell, maintaining data continuity and reducing retransmissions by preserving HARQ entity data during the serving cell change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs MAC reset during serving cell change, then the HARQ entity is properly reset for the target cell, but the unsuccessfully decoded data from the source cell is lost requiring retransmission
Solution Approach 1:
The patent extracts the unsuccessfully decoded data from the source cell's HARQ buffer before the MAC reset operation, preserving it separately. This allows the MAC reset to proceed for the target cell while the extracted data can be retransmitted or combined with new data, preventing complete data loss during the cell change transition.
Solution Approach 2:
The patent performs preliminary extraction and preservation of unsuccessfully decoded data before the MAC reset is executed. By preparing this data in advance, the system ensures that when the reset occurs, the critical information is already safeguarded and can be used for retransmission or combining operations, avoiding the need to restart HARQ processes from scratch.
2Productivity
If the terminal discards source cell HARQ data during serving cell change, then the target cell can start fresh with new HARQ processes, but data continuity is broken leading to increased retransmissions
Solution Approach 1:
The patent merges the preserved unsuccessfully decoded data from the source cell with newly received data in the target cell's HARQ buffer. This combining operation allows the terminal to utilize both old and new data for decoding attempts, maintaining data continuity while enabling the target cell to proceed with its HARQ processes efficiently without complete data loss.
Solution Approach 2:
The patent selectively discards only the portions of data that were successfully decoded in the source cell, while recovering and preserving the unsuccessfully decoded portions. This selective discarding and recovering approach allows the system to free up space for new data in the target cell while maintaining continuity for the critical undecoded portions that need further processing.
3Adaptability or versatility
If the terminal performs MAC reset during serving cell change, then the system follows current protocol standards, but communication efficiency decreases due to lost HARQ data
Solution Approach 1:
The patent performs preliminary extraction of unsuccessfully decoded data before the MAC reset operation, ensuring protocol compliance is maintained while preserving critical information. This preliminary action allows the system to follow the standard MAC reset procedure for target cell initialization while simultaneously protecting source cell data that needs to be retained for retransmission or combining operations.
Solution Approach 2:
The patent introduces an intermediary mechanism that bridges the source cell and target cell HARQ buffers during the MAC reset process. This intermediary structure allows the unsuccessfully decoded data to be temporarily held and managed separately, enabling the MAC reset to proceed according to protocol standards while the intermediary ensures no data is permanently lost, thus maintaining both protocol compliance and communication efficiency.
Data Source
AI summary
Provided are information processing methods, a terminal, and a network-side device. The method includes: a terminal receives a serving cell change command, where the serving cell change command indicates the terminal to perform a serving cell change; the terminal performs the serving cell change; the terminal receives, after performing the serving cell change, retransmitted data of a source serving cell from a target serving cell based on HARQ information indicated in a downlink assignment that is received by the target serving cell; and in a case that the terminal stores unsuccessfully decoded data of the source serving cell in an HARQ buffer in a first HARQ process of a first HARQ entity, the terminal combines the unsuccessfully decoded data of the source serving cell and the retransmitted data of the source serving cell received from the target serving cell, and decodes the combined data.