CPRI Data Transmission Overhead Elimination in OTN
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Solution Overview
Problem
Current communication methods, such as those using Optical Transport Networks (OTN) for data transmission in radio access networks, suffer from low data transmission efficiency due to redundant overheads caused by 8B/10B or 64B/66B encoding, leading to wasted bandwidth and increased costs with the growing number of Remote Radio Units (RRUs).
Innovation Solution
A method and device that decode 10B or 66B code streams into 8B or 64B code streams, insert frame header indication information, and map these into Optical Channel Payload Units (OPUs) within Optical Channel Data Units (ODUs), effectively eliminating redundant overheads and optimizing bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 8B/10B or 64B/66B encoding is used for CPRI service data transmission, then data can be transmitted through OTN devices, but redundant overheads are caused leading to wasted bandwidth and low transmission efficiency
Solution Approach 1:
The patent extracts and removes the redundant encoding overhead from the CPRI service data transmission process. By directly mapping the encoded CPRI data into OTN frames without additional 8B/10B or 64B/66B encoding layers, the solution eliminates the wasteful overhead while maintaining transmission capability through OTN devices.
2Productivity
If fiber direct connection is used between RRU and BBU, then data transmission is achieved, but deployment costs increase rapidly with growing number of RRUs
Solution Approach 1:
The patent makes the OTN device serve multiple functions: it acts as both the transport network device and the encoding/decoding endpoint for CPRI services. By eliminating the need for dedicated fiber direct connections between each RRU and BBU pair, and instead using shared OTN network infrastructure with centralized encoding/decoding, the solution reduces deployment costs while maintaining transmission capability.
3Ease of operation
If CPRI service is directly and transparently mapped into OTU frame, then transmission is simplified, but redundant overheads are mapped for transmission wasting bandwidth resources
Solution Approach 1:
The patent changes the encoding parameters of the CPRI service data before mapping into OTN frames. Instead of directly mapping transparently with redundant overhead, the data undergoes parameter transformation through optimized encoding schemes that reduce overhead, thereby improving bandwidth resource utilization while maintaining ease of mapping through standardized OTN frame structures.
Data Source
AI summary
Embodiments of the present disclosure provide a data transmission method and a device, and the method includes: determining synchronization header indication information indicating a frame header location of a first code stream, where the first code stream is obtained by encoding CPRI service data; decoding the first code stream to obtain a second code stream, where the first code stream is a 10B code stream, and the second code stream is an 8B code stream, or the first code stream is a 66B code stream, and the second code stream is a 64B code stream; inserting frame header indication information indicating a frame header location of the second code stream into the second code stream according to the synchronization header indication information; and mapping the second code stream and the frame header indication information into an OPU in an ODU frame.