Resource Block Group Allocation for LTE Control Signal Overhead
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Solution Overview
Problem
Current LTE systems face inefficiencies in notifying resource block allocation information, particularly with the Bit Map method requiring excessive overhead and leading to increased useless resource allocation due to the need for dummy data when using the Tree-Based method for uplink scheduling grants.
Innovation Solution
A method for allocating resource block groups with consecutive resource blocks on the frequency axis, determining the number of control signals needed to notify allocation information, and identifying allocated resource blocks from notified groups, optimizing the use of control signals in both uplink and downlink scheduling grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the Bit Map method is used for resource block allocation notification, then the number of frequency blocks can be increased, but the overhead of control signals increases significantly
Solution Approach 1:
The patent segments the resource block allocation notification into multiple parts: a first indication information indicating a first resource block group, and a second indication information indicating a second resource block group. This segmentation allows efficient notification of multiple frequency blocks without requiring a full Bit Map for all resource blocks, thereby reducing control signal overhead while maintaining adaptability.
Solution Approach 2:
The patent introduces a time dimension by allocating different resource block groups in different time slots or subframes. The first resource block group and second resource block group can be allocated at different times, allowing the system to handle multiple frequency blocks without increasing the instantaneous control signal overhead, thus resolving the contradiction between adaptability and overhead.
2Quantity of substance
If the Tree-Based method is used for uplink scheduling grant, then control signal overhead is reduced, but dummy data must be inserted when allocation information exceeds available bits
Solution Approach 1:
The patent makes the resource block group allocation dynamic by allowing the first resource block group and second resource block group to be flexibly configured based on actual traffic needs and channel conditions. This dynamic allocation eliminates the need for static dummy data insertion, as the system can adapt the allocation size and structure to match the actual data requirements, thereby reducing useless resource allocation while maintaining low overhead.
Solution Approach 2:
The patent changes the parameter structure of resource allocation by using resource block groups instead of individual resource blocks, and by introducing multiple indication information fields with different granularities. This parameter change allows the system to represent a wider range of allocation scenarios without requiring fixed-size dummy data fields, thus reducing waste while keeping overhead low.
3Ease of operation
If resource block allocation information is transmitted in fixed-size blocks, then transmission simplicity is maintained, but efficiency decreases when actual allocation requires fewer resources
Solution Approach 1:
The patent segments the resource allocation information into multiple indication fields (first indication information, second indication information) that can independently represent different resource block groups. This segmentation allows the system to transmit only the necessary allocation information for each group, maintaining transmission simplicity through structured fields while improving efficiency by avoiding the transmission of unnecessary dummy data when allocations are small.
Data Source
AI summary
Provided is a technique capable of reporting resource block allocation information with no waste when an allocated resource block is reported, because in the current LTE downlink, the waste of the amount of resource allocation information increases in some cases since a restriction is imposed such that 37-bit fixed scheduling information is transmitted. A resource block group consisting of at least one or more resource blocks continuous on the frequency axis is allocated to a terminal, and the number of controlling signals for reporting allocation information indicating the allocated resource blocks is determined.