LTE Resource Block Assignment Field Segmentation for VoIP Overhead Reduction
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Solution Overview
Problem
Fourth generation wireless technologies, such as LTE, face inefficiencies in voice service transmission due to shared resource allocation mechanisms, leading to substantial control overhead and inefficient spectrum utilization for small, fixed-size packets like VoIP, despite optimizations like semi-persistent scheduling and LTE-Advanced features.
Innovation Solution
Implementing a compact scheduling message with reduced resource allocation overhead by shortening the resource block assignment field in the downlink control information message, allowing for efficient allocation of physical resource blocks for VoIP packets, and potentially using frequency multiplexing of ePDCCH with PDSCH to improve spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional downlink control information messages are used for resource allocation, then comprehensive resource assignment capability is maintained, but signaling overhead increases substantially for small packets
Solution Approach 1:
The patent segments the resource block assignment field into multiple parts: a first portion indicating a resource block group, and a second portion indicating a specific resource block within that group. This segmentation allows the control message to be tailored for small packet transmissions by only specifying the necessary level of detail, thereby reducing signaling overhead while maintaining adequate resource allocation capability.
Solution Approach 2:
The patent applies partial action by providing only the necessary level of resource specification for small packets. Instead of fully specifying every resource block detail in all cases, the system uses a compact format with resource block group indication followed by a smaller subset indication, which is sufficient for small packet allocations but can be extended when needed, thus reducing overhead for the common small packet case.
2Ease of operation
If shared resource allocation mechanisms are used in LTE, then resource flexibility is maintained, but control overhead becomes substantial for voice services
Solution Approach 1:
The patent creates a universal resource indication mechanism that can serve multiple purposes. The resource block group indication combined with a subset indication can handle both small packet allocations (like VoIP) and larger allocations, providing a multi-functional solution that reduces overhead for voice services while maintaining the flexibility needed for various service types through the same control structure.
3Quantity of substance
If standard downlink control information formats are used, then complete resource specification is provided, but spectral efficiency decreases for VoIP packets
Solution Approach 1:
By segmenting the resource indication into a resource block group portion and a subset portion, the patent reduces the total number of bits required to specify resources for small packets. This segmentation allows the system to indicate resources at a coarser granularity (resource block group) and then refine to specific blocks only when necessary, improving spectral efficiency while preserving sufficient resource assignment detail.
Data Source
AI summary
Disclosed in some examples is a method of wireless resource block assignment in a long term evolution wireless network including creating a downlink control information message for a user equipment, the downlink control information message comprising: a resource block assignment field which indicates up to N physical resource blocks scheduled to the user equipment by specifying an index into a plurality of all possible physical resource block allocations of between 1 and N resource blocks, wherein the resource block assignment field comprises at most a number of bits necessary to address all of the possible physical resource block allocations for assignments of 1 to N physical resource blocks, and wherein N is less than a total number of physical resource blocks; and sending the downlink control information over a physical downlink control channel using orthogonal frequency division multiplexing.