OFDM Channel Allocation for Resource Utilization
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Solution Overview
Problem
In multicarrier communication systems, frequency diversity transmission can lead to a decrease in communication resource utilization efficiency when combined with frequency scheduling transmission, as unused subblocks in resource blocks (RBs) are not fully utilized, resulting in inefficient use of communication resources.
Innovation Solution
A channel arrangement method that divides subcarriers into resource blocks and allocates consecutive distributed channels within one resource block, ensuring all subblocks are utilized, thereby preventing a fall in utilization efficiency during simultaneous frequency scheduling and frequency diversity transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple distributed channels are allocated to a single mobile station using conventional methods, then control information can be reduced by reporting only first and last channel numbers, but communication resource utilization efficiency decreases because unused subblocks remain idle
Solution Approach 1:
The patent merges multiple distributed channels into a single resource block allocation unit. By allowing multiple Dch's to be allocated within one RB and enabling the mobile station to select channels from this consolidated allocation, the system achieves both reduced control information (reporting only first and last channel numbers) and improved resource utilization (no unused subblocks remain idle).
Solution Approach 2:
The patent introduces dynamic channel selection capability to the mobile station. Instead of fixed channel assignments, the mobile station can dynamically select which distributed channels to use from the allocated RB, allowing flexible adaptation to different transmission scenarios while maintaining efficient resource utilization and minimal control overhead.
2Reliability
If distributed channels are allocated across multiple resource blocks, then frequency diversity effect is improved, but resource blocks are not fully utilized causing inefficiency
Solution Approach 1:
The patent segments the distributed channels within an RB into multiple subblocks that can be independently utilized. This segmentation allows the mobile station to select and use only the subblocks that are actually allocated, eliminating idle subblocks while maintaining the frequency diversity benefits of distributed channel allocation across different frequency positions.
3Loss of information
If consecutive distributed channels are allocated to a mobile station, then control information is minimized, but subblocks outside the allocated range remain unused
Solution Approach 1:
The patent makes the resource block allocation universal by enabling it to serve multiple distributed channels simultaneously. The single RB allocation can accommodate multiple Dch's with consecutive channel numbers, and the mobile station can flexibly utilize the allocated subblocks for different channels, ensuring no resource waste while maintaining minimal control information requirements.
Data Source
AI summary
Provided is a radio communication base station device which can prevent lowering of use efficiency of a channel communication resource for performing a frequency diversity transmission when simultaneously performing a frequency scheduling transmission and the frequency diversity transmission in a multicarrier communication. In the device, a modulation unit (12) executes a modulation process on Dch data after encoded so as to generate a Dch data symbol. A modulation unit (22) executes a modulation process on the encoded Lch data so as to generate an Lch data symbol. An allocation unit (103) allocates the Dch data symbol and the Lch data symbol to respective subcarriers constituting an OFDM symbol and outputs them to a multiplexing unit (104). Here, when a plurality of Dch are used for a Dch data symbol of one mobile station, the allocation unit (103) uses Dch of continuous channel numbers.