Robust header compression (ROHC) in next-generation network processors
IEEE/ACM Transactions on Networking
Robust Header Compression (ROHC) provides for more efficient use of radio links for wireless communication in a packet switched network. Due to its potential advantages in the wireless access area and the proliferation of network processors in access infrastructure, there exists a need to understand the resource requirements and architectural implications of implementing ROHC in this environment. We present an analysis of the primary functional blocks of ROHC and extract the architectural
... ations on nextgeneration network processor design for wireless access. The discussion focuses on memory space and bandwidth dimensioning as well as processing resource budgets. We conclude with an examination of resource consumption and potential performance gains achievable by offloading computationally intensive ROHC functions to application specific hardware assists. We explore the design tradeoffs for hardware assists in the form of reconfigurable hardware, Application-Specific Instruction-set Processors (ASIPs), and Application-Specific Integrated Circuits (ASICs). ROHC Compressor Reference Header Reference Header IPv6/UDP/RTP headers Voice Datagrams w/ ROHC headers Voice Datagrams w/ Radio Link ROHC Decompressor IPv6/UDP/RTP headers Voice Datagrams w/ Figure 1: Example scenario of ROHC compression/decompression of IPv6/UDP/RTP headers for communication over a radio link.