Base Station Modulation Mapping for UE Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current communication technologies, specifically in LTE, face compatibility issues between base stations and user equipment (UE) supporting 256QAM and those not supporting 256QAM, leading to incompatibility and inability to provide services to both types of UE.
Innovation Solution
A transmission method where the base station stores both higher order modulation (256QAM) and lower order modulation (64QAM, 16QAM, QPSK) mapping tables, and determines the appropriate modulation scheme based on UE capability level information and signal quality, allowing for seamless communication with UE supporting or not supporting 256QAM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station uses 256QAM modulation to increase data transmission volume, then the data transmission efficiency is improved, but compatibility with UE not supporting 256QAM deteriorates
Solution Approach 1:
The base station dynamically selects between 256QAM and 64QAM modulation schemes based on UE capability indicators. When a UE supports 256QAM, the base station uses 256QAM for higher data transmission volume. When the UE does not support 256QAM, the base station automatically switches to 64QAM to ensure compatibility. This dynamic adaptation resolves the contradiction between maximizing productivity and maintaining versatility.
Solution Approach 2:
The base station changes the modulation order parameter from 8 (256QAM) to 6 (64QAM) based on UE capability. By adjusting this critical parameter, the system can achieve high data transmission volume when appropriate while maintaining broad compatibility across different UE types, thus resolving the contradiction between improved productivity and adaptability.
2Device complexity
If the base station stores only one modulation mapping table (256QAM), then the system complexity is reduced, but the ability to serve both 256QAM and 64QAM UEs deteriorates
Solution Approach 1:
The base station maintains multiple modulation mapping tables (256QAM and 64QAM) to serve different types of UEs. Each mapping table is optimized for its specific modulation scheme, allowing the base station to universally support both 256QAM-capable and 64QAM-only UEs. This multi-functionality approach ensures that the system can adapt to different UE capabilities without compromising service quality.
Solution Approach 2:
The base station pre-stores multiple modulation mapping tables for different modulation schemes before communication begins. When a UE connects, the base station has already prepared the appropriate mapping table based on the UE's capability indicator, enabling immediate and appropriate service without requiring real-time conversion or additional complexity during active communication.
3Adaptability or versatility
If the base station uses 64QAM modulation to ensure compatibility with all UE, then the compatibility is improved, but the data transmission volume deteriorates
Solution Approach 1:
The base station dynamically adjusts the modulation scheme from fixed 64QAM to either 64QAM or 256QAM based on UE capability. This dynamic approach allows the system to maintain compatibility with all UE types while maximizing data transmission volume when the UE supports higher-order modulation, thus resolving the contradiction between adaptability and productivity.
Solution Approach 2:
The base station changes the modulation order parameter from fixed 6 (64QAM) to either 6 or 8 (256QAM) based on UE capability indicator. This parameter adjustment enables the system to ensure universal compatibility when necessary while achieving higher productivity when the UE supports 256QAM, resolving the contradiction between adaptability and data transmission volume.
Data Source
AI summary
Disclosed is a transmission method compatible with higher order modulation and lower order modulation, and an apparatus. A base station stores a first higher order modulation mapping table supporting the higher order modulation and a first lower order modulation mapping table supporting the lower order modulation; the base station receives capability level information sent by user equipment; the base station determines, according to the capability level information sent by the user equipment, a first modulation mapping table used to communicate with the user equipment; the base station determines a modulation and coding scheme index according to the modulation mapping table, where the modulation and coding scheme index is used by the user equipment to determine a modulation and coding scheme; and the modulation and coding scheme index is sent to the user equipment.