Two-Level Control Channel Resource Allocation
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Solution Overview
Problem
In LTE systems, the flexibility of PDSCH resource scheduling is restricted, and information overheads for downlink resource allocation are high due to the fixed RBG size related to system bandwidth, especially when UE bandwidth is less than the system bandwidth, limiting frequency selection performance.
Innovation Solution
A two-level downlink control channel structure is introduced, with a level-1 control channel in the control region and a level-2 control channel in the data region, allowing for flexible resource allocation by using first-type and second-type RBGs, reducing information overheads, and improving scheduling flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RBG size is fixed based on system bandwidth, then resource allocation is simplified, but flexibility of PDSCH resource scheduling is restricted
Solution Approach 1:
The patent divides the downlink system bandwidth into multiple bandwidth parts, each with its own RBG size configuration. This segmentation allows different RBG sizes to be applied to different bandwidth parts, enabling flexible PDSCH resource scheduling within each part while maintaining simplified allocation procedures. The bandwidth part concept divides the overall bandwidth into manageable segments that can be independently configured.
Solution Approach 2:
The patent introduces dynamic RBG size configuration where the RBG size is no longer fixed but can be adjusted based on the specific bandwidth part and scheduling requirements. This dynamic approach allows the system to adapt RBG sizes to match UE bandwidth capabilities and traffic patterns, improving PDSCH resource scheduling flexibility while keeping the allocation mechanism relatively simple through predefined configurations.
2Ease of manufacture
If RBG size is bound to system bandwidth, then resource allocation is straightforward, but frequency selection performance is affected
Solution Approach 1:
The patent applies different RBG sizes to different bandwidth parts based on local requirements. Each bandwidth part can have an RBG size optimized for its specific frequency range and traffic characteristics, rather than using a single system-wide RBG size. This local optimization improves frequency selection performance by allowing fine-grained resource allocation in specific frequency regions while maintaining straightforward implementation through independent configuration of each bandwidth part.
3Device complexity
If downlink resource allocation uses system bandwidth-based RBG size, then allocation is simplified, but information overheads increase
Solution Approach 1:
By segmenting the bandwidth into multiple parts with different RBG sizes, the patent reduces the number of resource blocks that need to be individually signaled. Within each bandwidth part, fewer RBGs need to be allocated and signaled compared to a system-wide approach, thereby reducing control channel information overhead while maintaining a relatively simple allocation mechanism through standardized procedures applied to each segment.
Data Source
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AI summary
This application discloses a resource configuration method and an apparatus, applied to a two-level control channel structure that includes a level-1 control channel and a level-2 control channel. The method includes: obtaining, by a base station, receive bandwidth of a terminal; generating first information based on the receive bandwidth, where the first information is used for determining a frequency domain resource range used by a downlink data channel; generating second information based on the first information, where the second information is used to indicate a location of the downlink data channel within the frequency domain resource range; and sending, by the base station, the first information and the second information to the terminal. According to the method for allocating a downlink data channel resource through joint indication by using control channels of two levels in the present invention, a size of a time-frequency resource of the level-2 control channel is configured based on a downlink resource scheduling status, and flexibility in allocation of the downlink data channel resource is improved. In addition, bandwidth regions are obtained through division based on the level-1 control channel, and the level-2 control channel further indicates a resource allocation location within a bandwidth region set, thereby reducing indication information overheads used for resource allocation.