PBCH Parity Encoding for Base Station Antenna Configuration
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Solution Overview
Problem
User equipment (UE) in 3GPP LTE wireless communication systems faces challenges in determining the base station's antenna configuration during initial network access, as the base station does not explicitly signal this information via the synchronization channel, leading to potential misidentification of antenna configurations, especially in multi-antenna transmissions.
Innovation Solution
The wireless communication infrastructure entity encodes communication configuration information, such as antenna configuration, onto parity bits using unique configuration indicator bits, which are then combined with the information word and transmitted, allowing user terminals to recover these bits and determine the correct configuration by minimizing detected errors across different hypothesis scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the base station does not explicitly signal antenna configuration via the synchronization channel, then the signaling overhead is reduced, but the user equipment cannot accurately identify the antenna configuration
Solution Approach 1:
The patent combines antenna configuration information with the PBCH transmission by encoding it into the PBCH codeword. This merging allows the UE to obtain antenna configuration information without requiring separate explicit signaling, thus reducing signaling overhead while maintaining identification accuracy.
Solution Approach 2:
The patent uses the PBCH codeword as an intermediary to convey antenna configuration information. By embedding the configuration data within the PBCH transmission structure, the system enables indirect communication of antenna configuration without adding separate signaling channels.
2Measurement precision
If the UE performs hypothesis testing for each antenna configuration, then the UE can potentially identify the correct configuration, but the decoding complexity increases
Solution Approach 1:
The patent extracts antenna configuration information from the PBCH codeword structure itself. By designing the encoding scheme to embed configuration data in specific fields of the PBCH, the UE can directly extract the information without performing multiple hypothesis tests, thereby reducing decoding complexity.
Solution Approach 2:
The base station performs preliminary encoding of the antenna configuration information into the PBCH codeword before transmission. This preliminary action prepares the data in a format that enables the UE to directly read and identify the configuration without complex hypothesis testing.
3Loss of information
If the PBCH mapping is changed according to antenna configuration, then the antenna configuration can be indicated, but the resource element mapping becomes more complex
Solution Approach 1:
The patent merges antenna configuration information with the existing PBCH resource element mapping. By encoding the configuration data within the standard PBCH structure and using the same resource elements, the system avoids creating separate or modified mapping schemes, thus maintaining mapping simplicity while transmitting configuration information.
4Loss of information
If multiple scrambling sequences are used for different antenna configurations, then the configuration information can be conveyed, but the UE processing time increases
Solution Approach 1:
The patent extracts antenna configuration information from the PBCH codeword content rather than using it to modify the scrambling sequence. This approach allows the UE to process a single scrambling sequence and then extract the configuration data, significantly reducing processing time compared to testing multiple scrambling sequences.
Data Source
AI summary
A wireless communication infrastructure entity (200) having a communication configuration is configured to generate parity bits based on an information word and to encode the parity bits based on the communication configuration of the wireless communication infrastructure entity, wherein the encoded parity bits are combined with the information word. A wireless communication user terminal is configured to identify a set of configuration indicator bits used to encode parity bits combined with an information word and to determine a communication configuration of the wireless communication entity from which the combination of the information word and the encoded parity bits were received based on the set of configuration indicator bits used to encode the parity bits.