Scrambling Codes for Semi-Persistent Scheduling Grant Discrimination
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently discriminating between dynamic and semi-persistent scheduling grants, leading to increased overhead and complexity in decoding control messages.
Innovation Solution
The implementation of scrambling codes to differentiate between dynamic and semi-persistent scheduling grants, where a specific scrambling code is used for semi-persistent grants, allowing devices to determine the type of grant based on cyclic redundancy check (CRC) matching after descrambling, thereby reducing unnecessary decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple grant types are generated and decoded to support both dynamic and semi-persistent scheduling, then system functionality is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent applies scrambling codes as a form of 'color coding' to differentiate between dynamic and semi-persistent grants. By applying different scrambling sequences (e.g., RRC-based scrambling for SPS grants vs. no scrambling or different scrambling for dynamic grants), the system enables UE to quickly identify grant types through CRC validation after descrambling, avoiding the need for multiple separate decoding paths and reducing overall decoding complexity
Solution Approach 2:
The patent introduces scrambling codes as an intermediary mechanism between the grant transmission and the UE decoding process. This intermediary layer allows the system to convey additional information (grant type) without modifying the fundamental PDCCH structure or requiring multiple separate control channels, thereby maintaining system functionality while simplifying the decoding architecture
2Adaptability or versatility
If multiple grant types are generated and decoded, then system functionality is improved, but processing time and overhead increase
Solution Approach 1:
The patent implements preliminary action by having the UE pre-configure scrambling codes and validation rules based on RRC signaling before actual grant reception. This allows the UE to immediately apply the correct descrambling and validation logic upon receiving a PDCCH, eliminating the need for sequential trial-and-error decoding of multiple grant types and significantly reducing decoding time
3Device complexity
If scrambling codes are applied to differentiate grant types, then grant discrimination is simplified, but processing overhead for scrambling and descrambling is added
Solution Approach 1:
The patent merges the grant type identification function with the existing CRC validation process by applying scrambling codes that, when correctly descrambled and validated, simultaneously confirm both the integrity of the message and the type of grant. This consolidation eliminates the need for separate grant type detection mechanisms and reduces overall processing overhead despite adding scrambling operations
Data Source
AI summary
A method for wireless communications is provided. The method includes receiving a control payload and a check protocol on a wireless link and decoding the control payload and the check protocol. The method also includes analyzing the control payload and the check protocol in view of a scrambling protocol and determining at least one control command based on the control payload, the check protocol, and the scrambling protocol.