HARQ Frame Data Structure for Blind Detection Receiver Linking
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Solution Overview
Problem
In communication systems using blind detection, HARQ protocols face challenges in combining and decoding frames without explicit frame identification, especially when re-transmissions are needed, as the receiver cannot link the first transmission with future frames without knowing the origin UE and frame sequence number.
Innovation Solution
A HARQ frame data structure is employed, which includes a data field for encoded data bits and a header field for information about the first frame, allowing the processor to compute CRCs and transmit additional information in subsequent frames to enable blind detection and decoding, thereby linking the first and re-transmitted frames into a single transaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If blind detection protocol is used to reduce overhead, then signaling overhead is reduced, but the receiver cannot link first transmission with future frames for HARQ combining
Solution Approach 1:
The frame is segmented into a data field and a header field. The header field contains frame identification information that is separated from the main data, allowing the receiver to extract association information without requiring full frame decoding or additional signaling overhead.
Solution Approach 2:
The header field with frame identification information is prepared in advance and included in the first frame transmission. This preliminary inclusion of identification data enables the receiver to associate subsequent re-transmissions with the original frame without requiring additional signaling exchanges.
2Productivity
If re-transmissions are sent without frame identification information, then transmission efficiency is maintained, but the receiver cannot combine frames for decoding
Solution Approach 1:
The frame identification information is extracted and placed in a dedicated header field within the re-transmission frame. This extraction allows the receiver to quickly identify and associate frames without processing the entire frame content, maintaining efficiency while enabling combining capability.
Solution Approach 2:
The header field acts as an intermediary that carries frame identification information between transmissions. This intermediary element enables the receiver to link first transmissions with future frames without requiring complex processing of the entire frame data.
3Reliability
If header field with frame information is added to enable association, then frame linking capability is improved, but overhead increases
Solution Approach 1:
Only the necessary frame identification information is included in the header field, rather than duplicating the entire frame or adding comprehensive metadata. This localized inclusion of essential association data provides the needed reliability while minimizing overhead.
4Device complexity
If blind detection is used without frame identification, then system simplicity is maintained, but HARQ protocol cannot operate effectively
Solution Approach 1:
The blind detection capability and HARQ frame association capability are merged by incorporating frame identification information directly into the frame structure itself. This combination allows the system to maintain simplicity while enabling effective HARQ operation, as the identification information is embedded rather than requiring separate signaling mechanisms.
Data Source
AI summary
A HARQ frame data structure and methods of transmitting and receiving with HARQ in systems using blind detection. In one embodiment, a method of transmitting over a channel using HARQ includes transmitting a first frame containing data toward a blind detection receiver, and transmitting a second frame containing at least a portion of the data and information about the first frame toward the blind detection receiver.