Content Type Indication via Bit Scrambling in 5G Downlink Packets
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Solution Overview
Problem
The 5G wireless communication system faces challenges in supporting ultra-reliable low-latency communication (URLLC) due to its higher reliability and lower latency requirements compared to conventional enhanced mobile broadband (eMBB) traffic, necessitating effective differentiation of processing priorities for mixed traffic scenarios.
Innovation Solution
A network access node and client device configuration that scrambles a subset of bits in a second data packet based on the content type of a first data packet, allowing the client device to prioritize processing based on indicated content types, without requiring new radio network temporary identifiers (RNTIs) or downlink control information formats, using existing cyclic redundancy check and RNTI mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional eMBB traffic handling is used for all data packets, then system complexity is minimized, but URLLC latency and reliability requirements cannot be met
Solution Approach 1:
The patent uses bit scrambling patterns as 'color codes' to indicate different content types. By scrambling specific bit positions in the downlink control information with different patterns (e.g., RNTI-based scrambling), the system differentiates between URLLC and eMBB traffic without adding complex signaling structures. The client device detects these scrambling patterns to identify traffic type and apply appropriate processing priorities.
2Ease of operation
If new RNTI formats and downlink control information formats are introduced to support content type indication, then processing priority differentiation is improved, but device complexity and standard changes increase
Solution Approach 1:
The patent makes existing RNTI mechanisms multi-functional by using different scrambling patterns of the same RNTI type to indicate different content types. Instead of creating new identifier formats, the system uses the existing RNTI scrambling mechanism to convey both addressing information and content type indication, allowing one structure to serve multiple purposes.
Solution Approach 2:
The patent changes the scrambling parameters (such as scrambling initialization values or patterns) of existing control information to indicate different content types. By modifying how the RNTI is applied in the scrambling process rather than creating new identifiers, the system achieves content type differentiation using existing infrastructure with adjusted parameters.
3Device complexity
If content type indication is implemented without scrambling mechanisms, then device complexity is reduced, but the ability to indicate multiple content types and differentiate processing priorities is limited
Solution Approach 1:
The patent uses bit scrambling as an intermediary mechanism to convey content type information. Instead of directly signaling content types through explicit fields, the scrambling pattern acts as a mediator that encodes content type information in a way that is already integrated into the existing control information structure, allowing efficient differentiation without additional signaling overhead.
Data Source
AI summary
The present disclosure relates to a network access node and a client device for content type indication. The network access node selects a subset of bits among a set of bits in a second data packet associated with the first data packet based on the content type for the first data packet. The network access node scrambles the selected subset of bits with a first scrambling sequence associated with an identity of the client device. The network access node transmits the first data packet and the second data packet to the client device (300). Upon reception of the first data packet and the second data packet, the client device descrambles the scrambled subset of bits in the second data packet using a first scrambling sequence associated with an identity of the client device to determine the content type for the first data packet.