ROHC Channel Management in Wireless Systems
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Solution Overview
Problem
Current header compression methods for wireless communication systems, such as ROHC, face inefficiencies due to high bit error ratios and increased header sizes, particularly in IP protocols like IPv4 and IPv6, leading to bandwidth wastage and communication issues under inferior conditions.
Innovation Solution
A method for creating and deleting service flows for ROHC in a wireless communication system that involves parameter negotiation between ROHC entities, using a control station, base station, and mobile station to establish and manage ROHC channels through dynamic service addition and deletion procedures, ensuring efficient header compression and decompression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If header compression is applied using IP protocols (IPv4/IPv6), then bandwidth utilization improves, but header size increases and bandwidth is wasted due to large header portions
Solution Approach 1:
The patent segments the header compression process into multiple phases: initial phase where full headers are transmitted to establish context, and subsequent phases where only compressed differential data is transmitted. This segmentation allows the system to benefit from both full header reliability and compressed header efficiency.
Solution Approach 2:
The patent dynamically changes header parameters by transitioning from transmitting complete header fields to transmitting only differential values for changed fields. The compression level and method are adjusted based on channel conditions and traffic patterns, optimizing the balance between header size and reconstruction accuracy.
2Speed
If traditional header compression methods are used under inferior communication circumstances, then transmission speed is maintained, but bit error ratio increases and round trip time increases largely
Solution Approach 1:
The patent implements error cushioning by transmitting redundancy information in the compressed headers and maintaining multiple context states. When bit errors occur, the receiver can use the redundancy and alternative contexts to correct errors without complete transmission failure, thus maintaining reliability under inferior channel conditions.
Solution Approach 2:
The patent employs feedback mechanisms where the receiver sends acknowledgments and error reports to the transmitter. Based on this feedback, the transmitter adjusts the compression level and retransmits necessary information, optimizing the trade-off between transmission speed and reliability in real-time.
3Adaptability or versatility
If service flow creation procedures are implemented for ROHC, then ROHC channel establishment is achieved, but system complexity increases due to parameter negotiation between multiple entities
Solution Approach 1:
The patent creates a universal service flow creation procedure that can handle multiple ROHC profiles and compression methods through a single standardized negotiation framework. This multi-functional approach allows the system to adapt to different requirements without creating separate complex procedures for each case.
Solution Approach 2:
The patent introduces an intermediary role in the parameter negotiation process between ROHC entities and the network infrastructure. This intermediary manages and coordinates the complex parameter exchanges, simplifying the interaction for individual entities while enabling comprehensive ROHC channel establishment.
Data Source
AI summary
A method of creating a service flow for ROHC in a control station is disclosed, which can establishes a ROHC channel between ROHC entities, the method comprising obtaining a first ROHC parameter from a ROHC entity of the control station, upon receiving a subscriber profile to which ROHC is applied; and transmitting a first message including the first ROHC parameter for requesting the creation of service flow to a mobile station related with the subscriber profile and a base station performing a dynamic service addition (DSA) procedure through the use of a second message including the first ROHC parameter.