Code-Block-Based Random Access Channel Communication
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) must decode entire transport blocks to access random access channels (RACH), which increases processing and memory resources and decoding time, and requires retransmission of the entire block if decoding fails.
Innovation Solution
Segmenting transport blocks into code blocks based on a specific RACH procedure, allowing UE to decode individual code blocks and providing hybrid automatic repeat request (HARQ) feedback at the code block level for retransmitting only failed blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE decodes the entire transport block to access RACH communication, then the RACH communication can be successfully received, but the processing and memory resources are increased and decoding time is extended
Solution Approach 1:
The transport block is segmented into multiple code blocks, with each code block containing a portion of the RACH communication. The UE can selectively decode only the code blocks that contain its intended communication, rather than decoding the entire transport block. This segmentation reduces the processing and memory resources required while maintaining reliable reception of the RACH communication.
2Reliability
If the UE decodes the entire transport block to access RACH communication, then the RACH communication can be successfully received, but the decoding time is increased
Solution Approach 1:
The transport block is divided into multiple code blocks, allowing the UE to identify and decode only the relevant code blocks containing its RACH communication. This selective decoding approach significantly reduces the time required compared to decoding the entire transport block, while ensuring reliable reception of the intended communication.
3Reliability
If the entire transport block is retransmitted when decoding fails, then the UE can successfully decode the RACH communication, but the networking and processing resources are increased
Solution Approach 1:
The transport block is segmented into multiple code blocks, enabling selective retransmission at the code block level. When decoding fails, only the specific failed code blocks need to be retransmitted rather than the entire transport block. This reduces networking and processing resources while maintaining reliable RACH communication reception.
Solution Approach 2:
The failed code blocks are extracted and identified separately from the successful ones. The UE can indicate which specific code blocks failed to decode, allowing the base station to retransmit only those extracted failed portions rather than retransmitting the entire transport block, thereby conserving networking and processing resources.
4Productivity
If individual code blocks are used for RACH communication, then the decoding resources and time are reduced, but the segmentation procedure complexity is increased
Solution Approach 1:
The transport block is segmented into code blocks using a standardized segmentation procedure that divides the block into manageable units. Each code block is independently decodable, improving decoding efficiency. The segmentation follows established protocols that balance the reduction in decoding complexity with the introduction of segmentation management, achieving net productivity improvement.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a transport block that includes one or more code blocks carrying a random access channel (RACH) communication directed to the UE. The transport block may be segmented into the one or more code blocks based at least in part on a segmentation procedure specific to a RACH procedure. The user equipment may decode the one or more code blocks based at least in part on a code block cyclic redundancy check (CRC) associated with the one or more code blocks. Numerous other aspects are provided.