Base Station Uplink Format Control via Unified Grant Coding
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Solution Overview
Problem
In wireless communication systems, there is a mismatch in the uplink data format sent by a mobile station and the format expected by the radio base station, leading to potential errors in receiving uplink data due to separate error detection and coding of downlink scheduling information and UL allocation grant, causing format mismatches and incorrect data transmission.
Innovation Solution
A radio base station performs error detection coding on both downlink scheduling information and UL allocation grant as a unit, ensuring that if errors are detected in either, they are detected in both, preventing format mismatches and ensuring the mobile station sends uplink data in a standardized format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mobile station sends uplink data using only the UL allocation grant without multiplexing ACK/NACK, then the uplink data transmission is simplified, but the radio base station cannot correctly receive the uplink data due to format mismatch
Solution Approach 1:
The mobile station multiplexes ACK/NACK feedback with uplink data and sends them together via PUSCH. This feedback mechanism allows the base station to correctly identify the data format and receive the uplink data properly, resolving the format mismatch problem while maintaining transmission simplicity
Solution Approach 2:
The ACK/NACK feedback and uplink data are merged into a single transmission channel (PUSCH). By combining these two elements, the system eliminates the format mismatch issue and ensures reliable reception at the base station without requiring separate transmission procedures
2Adaptability or versatility
If the radio base station sends downlink scheduling information and UL allocation grant separately, then the control data transmission is more flexible, but errors may occur in one without being detected in the other
Solution Approach 1:
Downlink scheduling information and UL allocation grant are merged into a single coded transmission unit. This allows the mobile station to detect errors consistently across both control messages, preventing the scenario where one message is received correctly while the other contains undetected errors
Solution Approach 2:
A unified coding scheme acts as an intermediary that processes both downlink scheduling information and UL allocation grant together. This intermediary mechanism ensures that error detection applies to both messages simultaneously, maintaining reliability while preserving transmission flexibility
Data Source
AI summary
A mobile station for performing radio communication with a radio base station, the mobile station includes an information generation section which generates information indicative of a result of error detection on a downlink signal received; and a sending section which sends the information via a physical uplink control channel, and sends uplink data via a physical uplink shared channel at a different transmission frequency from the physical uplink control channel and in a same transmission time period as the physical uplink control channel; whereby the information generation section and the sending section operate when the mobile station receives downlink scheduling information and uplink allocation grant in a same subframe.