UCI Scrambling for Autonomous Uplink Overhead Reduction
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Solution Overview
Problem
In wireless communication networks, autonomous uplink transmission systems face inefficiencies in communicating UCI with CRC, leading to increased overhead and reduced user data throughput due to the need for explicit UE-IDs in UCI, which consumes PUSCH resources.
Innovation Solution
The solution involves scrambling the CRC using the UE-ID, either by matching the CRC and UE-ID sizes or splitting the UE-ID into portions to minimize overhead, allowing the UE-ID to be implicitly encoded within the UCI, thereby reducing the overall UCI size and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit UE-IDs are included in UCI for autonomous uplink transmission, then the base unit can identify the transmitting UE, but the UCI overhead increases and user data throughput decreases
Solution Approach 1:
The patent merges the UE identification function with the CRC field by scrambling the CRC with the UE-ID. Instead of transmitting separate UE-ID and CRC fields, the UE-ID is embedded into the CRC through scrambling operations, combining identification and error detection functions into a single field, thereby reducing UCI overhead while maintaining identification reliability
Solution Approach 2:
The CRC field is given multiple functions: it serves both as an error detection mechanism and as a carrier for UE identification. By scrambling the CRC with the UE-ID, the same field performs dual purposes, eliminating the need for a separate UE-ID field in the UCI
2Measurement precision
If CRC size is increased to improve detection accuracy, then false detection protection improves, but UCI overhead increases
Solution Approach 1:
The patent combines the UE-ID information with the CRC field through scrambling, allowing the CRC to carry both error detection and identification information. This merging enables the system to use a smaller CRC size while still achieving reliable detection, as the scrambled CRC contains both the error detection code and the UE identifier
Solution Approach 2:
The patent changes the parameter of CRC size by using a 16-bit CRC instead of the traditional 8-bit CRC. This parameter change increases detection accuracy and allows the CRC to accommodate the scrambled UE-ID, improving false detection protection while the scrambling mechanism ensures efficient use of the expanded CRC field
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for communicating uplink control information (“UCI”) with cyclic redundancy check (“CRC”) in an autonomous uplink (“AUL”) transmission. One apparatus includes a processor and a transceiver that receives a control signal to enable AUL transmission. The processor determines to transmit data in an AUL transmission and generates UCI for the AUL transmission, wherein the UCI comprises a CRC, wherein the UCI further indicates an identifier of the apparatus. The processor transmits, via the transceiver, the UCI with the AUL transmission, wherein the AUL transmission comprises the UCI.