Downlink Data Block Segmentation for Throughput and USF Compatibility
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Solution Overview
Problem
In GSM EDGE radio access networks, the existing method of sending downlink data blocks using a modulation and coding scheme supported by mobile terminals with poorer capabilities reduces flexibility and throughput due to mismatched modulation and coding capabilities between USF and data information.
Innovation Solution
The method involves adding indication information for data information modulation modes to downlink data blocks, performing symbol mapping and data pre-processing on separate information streams using different modulation modes, and combining them to form an aggregate modulated signal, allowing for flexible modulation based on terminal capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a downlink data block is sent by using a modulation and coding scheme supported by a mobile terminal with a poorer modulation and coding capability, then USF compatibility is improved, but the flexibility of higher-order modulation on the data information part is lost and throughput of downlink data is reduced
Solution Approach 1:
The downlink data block is segmented into two separate parts: a first part carrying USF information modulated with a first modulation mode, and a second part carrying data information modulated with a second modulation mode. This segmentation allows each part to use different modulation schemes independently, resolving the contradiction between USF compatibility and data throughput.
Solution Approach 2:
Different modulation modes are applied to different parts of the downlink data block based on their specific requirements. The USF part uses a modulation mode compatible with low-capability terminals, while the data part uses a higher-order modulation mode optimized for throughput, achieving local optimization of quality.
2Productivity
If a higher-order modulation mode is used for the data information part, then throughput of downlink data is improved, but compatibility with low-capability mobile terminals is reduced
Solution Approach 1:
By segmenting the downlink data block into separate USF and data information parts, the patent enables the data part to independently use higher-order modulation modes for improved throughput, while the USF part maintains compatibility with low-capability terminals through separate modulation.
Solution Approach 2:
The patent changes the modulation mode parameter differently for different parts of the transmission. The data information part uses a higher-order modulation mode (e.g., 16QAM, 64QAM) to improve throughput, while the USF part uses a lower-order mode (e.g., GMSK) to ensure compatibility, allowing parameter optimization for each function.
3Productivity
If separate modulation modes are used for USF information and data information, then flexibility and throughput are improved, but system complexity increases
Solution Approach 1:
The segmentation of the downlink data block into separate USF and data parts with independent modulation processing, while increasing functional flexibility, actually simplifies the overall system architecture by allowing each segment to be processed independently according to its specific requirements, avoiding the need for complex unified modulation schemes.
Data Source
AI summary
The present disclosure relates to a method and an apparatus for sending and receiving a downlink data block of a packet data service. A network side adds indication information of downlink data modulation modes to a downlink data block, where the downlink data block includes first information and second information; the network performs symbol mapping processing on the first information by using a first modulation mode to obtain a first modulated signal; the network performs symbol mapping processing and data pre-processing on the second information by using a second modulation mode to obtain a second modulated signal; the network combines these two modulated signals to obtain an aggregate modulated signal; and the network sends the aggregate modulated signal. With the present disclosure, throughput of downlink data is increased while a USF compatibility between more types of low-capability mobile terminals is considered.