HARQ Combiner Memory Controller Modem Chip
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Solution Overview
Problem
Existing wireless communication systems face errors due to variable channel environments, particularly in mobile communication standards like LTE and HSPA, where data transmission reliability is compromised by signal interference and terminal movement, necessitating repeated data transmission and error correction through HARQ, but current technologies lack efficient processing methods for control channels and data channels.
Innovation Solution
The development of modem chips and receivers equipped with an HARQ combiner and memory controller to perform HARQ combinations on both control and data channels, storing and managing retransmitted data to enhance data reliability through soft combining and memory efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate HARQ processing is performed for control channels and data channels, then decoding success probability is improved, but device complexity and memory usage increase
Solution Approach 1:
The patent combines HARQ processing for control channels and data channels into a unified processing framework. The receiver performs HARQ combining on both control channel data and data channel data through a common HARQ processing module, merging previously separated processing paths. This reduces device complexity while maintaining decoding success probability through integrated soft combining of multiple transmissions.
Solution Approach 2:
The HARQ processing module is designed to handle multiple channel types (control channels and data channels) universally. The same HARQ combiner and memory structure are used for different channel types, allowing the system to perform HARQ processing for various channels through a single multi-functional module, thereby reducing overall device complexity.
2Reliability
If separate memory is allocated for control channel HARQ data and data channel HARQ data, then data reliability is improved, but memory usage increases
Solution Approach 1:
The patent merges the memory structures for storing control channel HARQ data and data channel HARQ data into a unified memory system. A single memory module stores HARQ data from both channel types, with appropriate addressing and management to distinguish between different data types. This reduces total memory usage while maintaining data reliability through proper separation of data streams within the unified memory.
3Reliability
If repeated data transmission is performed in variable channel environments, then data reliability is improved, but transmission time delay increases
Solution Approach 1:
The patent implements continuous HARQ combining operations that accumulate soft data from multiple transmissions without interruption. The receiver continuously combines incoming retransmissions with previously stored data in memory, maintaining an ongoing combining process rather than waiting for complete transmission cycles. This continuous action reduces effective delay by processing data as it arrives while maintaining reliability through accumulated combining.
Solution Approach 2:
The system performs preliminary HARQ combining on received data before final decoding is attempted. By pre-combining available retransmissions with stored data in advance, the system prepares improved data quality earlier in the transmission process, reducing the need for additional retransmission rounds and thereby reducing overall transmission time delay.
Data Source
AI summary
A modem chip for supporting combination of data repeatedly transmitted based on hybrid automatic repeat request (HARQ) is provided. The modem chip includes an HARQ combiner configured to perform a HARQ combination by combining retransmitted data with the previous HARQ data, the retransmitted data including retransmitted control channel data received via a control channel and retransmitted data channel data received via a data channel, the previous HARQ data corresponding to data received via the control channel and the data channel, the HARQ combination generating updated HARQ data, a memory configured to store the previous HARQ data and the updated HARQ data, and a memory controller configured to control transmission of the previous HARQ data and the updated HARQ data between the HARQ combiner and the HARQ memory.