Base Station USF Segmentation for Mixed-Modulation Downlink Blocks
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Solution Overview
Problem
The existing solution for downlink transmission in wireless communication networks, particularly in GERAN/EDGE Evolution, often results in non-optimal modulation choices due to the requirement of using the same modulation technique for consecutive blocks to support legacy terminals, leading to modulation segregation and suboptimal spectrum and hardware utilization.
Innovation Solution
The method involves obtaining and using different modulation techniques for each data block, allowing the downlink scheduler to choose the most accurate modulation for each block independently, while ensuring compatibility with legacy terminals by defining new USF codewords that can be modulated differently for each part, thereby avoiding modulation segregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same modulation technique is used for two consecutive downlink blocks to support legacy terminals, then compatibility with legacy terminals is maintained, but spectrum utilization and hardware utilization become suboptimal
Solution Approach 1:
The USF value is segmented into two separate parts: first USF part transmitted in the first downlink block and second USF part transmitted in the second downlink block. This segmentation allows each block to use different modulation techniques optimized for current terminals while still providing complete USF information to legacy terminals that can decode both blocks.
Solution Approach 2:
Different modulation techniques are applied to different data blocks based on local conditions. The first downlink block uses a first modulation technique and the second downlink block uses a second modulation technique, allowing each block to be optimized independently for spectrum utilization while maintaining legacy terminal compatibility through the segmented USF approach.
2Reliability
If the same modulation technique is used for two consecutive downlink blocks, then legacy terminals can decode the USF, but the downlink scheduler is constrained in modulation choice
Solution Approach 1:
The USF value is divided into two parts transmitted across separate blocks, allowing the scheduler to independently select modulation techniques for each block without being constrained by the need to use the same modulation for the entire USF transmission.
Solution Approach 2:
The modulation technique becomes dynamic rather than static - the scheduler can adaptively choose different modulation techniques for the first and second downlink blocks based on current channel conditions and terminal capabilities, while legacy terminals remain able to decode the segmented USF information.
Data Source
AI summary
Method, arrangement and computer program product in a base station for transmitting two USF values and two data blocks to a terminal. The base station and the terminal are comprised within a wireless communication network. The two USF values are to be sent across the first data block and the second data block. The first data block and first parts of the two USF values are modulated with a first modulation technique and the second data block and second parts of the two USF values are modulated with a second modulation technique. The modulated data blocks and USF parts are transmitted to the terminal. Further, a method, an arrangement and a computer program product in a terminal for receiving USF values and data blocks from a base station are described. In addition, a method, an arrangement and a computer program product in a control node are described.