Selective PDCP Processing for LTE WLAN Interworking
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Solution Overview
Problem
Current systems face challenges in efficiently managing and integrating LTE and WLAN radio access technologies, particularly in processing Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) across Evolved Universal Mobile Telecommunications System (UMTS) networks, leading to complexities in security and resource management.
Innovation Solution
The implementation of a selective PDCP processing scheme that differentiates between LTE and WLAN links by applying PDCP procedures such as ciphering, sequence numbering, and header compression selectively, allowing for encrypted PDUs over LTE and unencrypted PDUs over WLAN, while maintaining security and reducing UE complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCP procedures such as ciphering are applied to all links including WLAN, then security is improved, but device complexity increases
Solution Approach 1:
The patent applies different security processing to different transmission links: ciphering is applied only to LTE links while WLAN links transmit unencrypted. This local differentiation resolves the contradiction by providing security where needed (LTE) without adding unnecessary complexity to all processing paths (WLAN).
Solution Approach 2:
The patent segments the transmission path into two distinct processing flows: one for LTE links that includes PDCP ciphering, and another for WLAN links that excludes ciphering. This segmentation allows the system to maintain security requirements for cellular transmissions while avoiding redundant processing for WLAN transmissions.
2Device complexity
If PDCP procedures are applied selectively to different links, then device complexity is reduced, but security may be compromised
Solution Approach 1:
The patent implements link-specific processing where the LTE path receives full PDCP treatment including ciphering for security, while the WLAN path receives simplified processing without ciphering. This ensures security is maintained where required by regulation (LTE) without adding unnecessary complexity elsewhere (WLAN).
Solution Approach 2:
The system dynamically selects which processing path to use based on the transmission medium. When LTE is the active link, ciphering is applied; when WLAN is used, ciphering is skipped. This dynamic adaptation allows the system to maintain appropriate security levels for each link type while optimizing device complexity.
3Reliability
If encryption is applied to PDUs over WLAN, then security is improved, but interworking efficiency between LTE and WLAN deteriorates
Solution Approach 1:
The patent applies encryption selectively based on the transmission link characteristics. LTE transmissions receive PDCP ciphering while WLAN transmissions are left unencrypted. This local differentiation improves interworking efficiency by avoiding redundant encryption/decryption operations on WLAN paths while maintaining security on LTE paths.
Solution Approach 2:
Instead of applying full PDCP processing including ciphering to all links, the patent applies only the necessary portion of processing to each link type. WLAN transmissions receive partial processing (excluding ciphering) which is sufficient for their security requirements and optimizes interworking performance.
Data Source
AI summary
Some demonstrative embodiments include devices, systems and/or methods of processing Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) of an Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) Radio Access Bearer (E-RAB). For example, an apparatus may include PDCP processor configured to process a plurality of PDUs of an E-RAB, the PDCP processor configured to apply a sequence of a plurality of PDCP procedures to one or more first PDUs communicated via the cellular link, and to apply no more than a part of the sequence of PDCP procedures, by selecting not to apply one or more of the plurality of PDCP procedures, to one or more second PDUs communicated via a non-cellular Radio Access Technology (RAT).