Resource Block Interleaving for LTE Distributed Transmission
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Solution Overview
Problem
Current LTE systems face inefficiencies in resource block allocation for distributed transmission, leading to increased overhead and insufficient diversity for small packet sizes, as they use the same mapping scheme for both localized and distributed transmissions, which limits flexibility and performance.
Innovation Solution
A method and system that maps distributed resource block indices to physical resource blocks using an interleaver and transceiver, allowing for coexistence with localized transmission arrangements by interleaving logical indices to maximize spacing and reduce signaling overhead, optimizing resource allocation for both transmission types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same mapping scheme is used for both localized and distributed transmissions, then device complexity is reduced, but signaling overhead increases and frequency diversity is insufficient for distributed transmission
Solution Approach 1:
The patent segments the mapping scheme into two distinct types: identity mapping for localized transmission and interleaver-based mapping for distributed transmission. This segmentation allows each transmission type to use the most appropriate mapping method, reducing overall system overhead while maintaining device complexity at acceptable levels through standardized procedures.
Solution Approach 2:
The patent introduces dynamic selection of mapping schemes based on transmission type. The system dynamically switches between identity mapping and interleaver-based mapping according to whether the transmission is localized or distributed, allowing optimal performance for each case while managing complexity through conditional logic.
2Device complexity
If identity mapping is used for distributed transmission, then device complexity is reduced, but frequency diversity is insufficient
Solution Approach 1:
The patent introduces an interleaver as an intermediary component between the distributed VRBs and physical resources. This interleaver scrambles the mapping relationship, providing frequency diversity by distributing transmitted symbols across different frequency resources, while remaining a relatively simple deterministic component that does not significantly increase device complexity.
3Reliability
If distributed VRBs are scattered across the band, then frequency diversity is improved, but signaling overhead increases
Solution Approach 1:
The patent changes the mapping parameter from direct identity mapping to interleaver-based mapping for distributed transmissions. This parameter change enables frequency diversity through scrambling while using standardized interleaver structures that minimize additional signaling overhead compared to arbitrary scattering schemes.
4Productivity
If localized transmission uses contiguous RBs, then processing efficiency is improved, but adaptability to distributed transmission requirements is reduced
Solution Approach 1:
The patent implements dynamic adaptability by selecting different mapping schemes based on transmission type requirements. Localized transmissions use identity mapping for processing efficiency, while distributed transmissions use interleaver-based mapping for frequency diversity, allowing the system to adapt to different transmission modes without compromising either performance metric.
Data Source
AI summary
An apparatus for communication using a wireless communication network includes an interleaver and a transceiver. The interleaver co-exists with a localized transmission arrangement if the localized transmission arrangement is present and interleaves data packets for a distributed transmission arrangement by mapping a set of logical indices to a set of physical resource blocks. The set of logical indices include sequential logical indices that are separated by a maximum spacing within the set. The transceiver is in electrical communication with the interleaver. The transceiver is operable to transmit and receive data packets through the wireless communication network.