Baseband Signal Compression for BTS Serial Link Capacity
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Solution Overview
Problem
Transceiver systems in wireless communication networks face challenges in managing increasing data volumes and evolving standards, leading to the need for enhanced data transfer capacity and resource conservation, particularly in base stations and distributed antenna systems, without the necessity for expensive hardware upgrades.
Innovation Solution
The implementation of signal sample compression and decompression methods within the base transceiver system, utilizing compressors and decompressors at both the RF unit and baseband processor, aligned with compression and decompression control parameters, to format and transfer compressed samples over serial data links, ensuring compatibility with existing data transfer protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal samples are transferred uncompressed over serial data links, then data transfer capacity is sufficient for current standards, but data transfer capacity becomes insufficient for evolving standards with increasing data volumes
Solution Approach 1:
The patent extracts redundant information from signal samples through compression algorithms. The compressor identifies and removes redundant data elements, retaining only essential information needed for signal reconstruction. This extraction process reduces the quantity of data that must be transferred over the serial link while preserving the critical signal characteristics required for baseband processing.
Solution Approach 2:
The patent changes the parameter representation of signal samples by transforming them into a compressed domain. Instead of transferring raw signal samples at full resolution, the system transforms samples into compressed representations with fewer bits per sample. The decompressor at the receiving end reverses this transformation, converting compressed parameters back to full-resolution signal samples for baseband processing.
2Productivity
If hardware upgrades are implemented to increase data transfer capacity, then data transfer capacity increases, but system cost increases
Solution Approach 1:
Instead of upgrading hardware to increase data transfer capacity, the patent changes the parameter representation of the data being transferred. By compressing signal samples into more compact representations, the system achieves higher effective data transfer capacity using existing hardware resources. This parameter transformation approach avoids the need for expensive hardware upgrades while meeting the data transfer requirements of evolving standards.
3Productivity
If compression is applied to signal samples, then data transfer capacity increases, but computational complexity increases
Solution Approach 1:
The patent segments the computational workload for compression and decompression into distributed components. The compressor is implemented in the RF unit, while the decompressor is implemented in the baseband processor. This segmentation allows each component to perform specialized computational tasks optimized for its function, reducing the overall computational complexity burden on any single device while achieving the data transfer capacity benefits of compression.
4Productivity
If existing serial data links are used without compression, then hardware requirements are met, but data transfer capacity is insufficient for future standards
Solution Approach 1:
The patent applies compression as a preliminary action before data transfer over the serial link. By pre-compressing signal samples at the transmitting end, the system prepares the data in advance to fit within the capacity constraints of existing serial data links. This preliminary compression enables the system to accommodate future standards with higher data volumes without requiring immediate hardware upgrades, as the compressed data format provides headroom for increased data requirements.
Data Source
AI summary
A signal compression method and apparatus for a base transceiver system (BTS) in a wireless communication network provides efficient transfer of compressed signal samples over serial data links in the system. For the uplink, an RF unit of the BTS compresses baseband signal samples resulting from analog to digital conversion of a received analog signal followed by digital downconversion. The compressed signal samples are transferred over the serial data link to the baseband processor then decompressed prior to normal signal processing. For the downlink, the baseband processor compresses baseband signal samples and transfers the compressed signal samples to the RF unit. The RF unit decompresses the compressed samples prior to digital upconversion and digital to analog conversion to form an analog signal for transmission over an antenna. Compression and decompression can be incorporated into operations of conventional base stations and distributed antenna systems, including OBSAI or CPRI compliant systems.