Compact Scheduling Assignments for Wireless Control Signaling
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in signaling overhead and scheduling flexibility due to the fixed size of scheduling assignments (SAs) in the Physical Downlink Control Channel (PDCCH), which affects throughput and coverage, especially for UEs with poor channel conditions.
Innovation Solution
Introducing compact UL and DL SAs that are smaller than full SAs, allowing for reduced PDCCH overhead, improved coverage, and enhanced scheduling flexibility by supporting multiple sizes and configuring UEs to receive SAs optimized for their specific bandwidth and data rates, thereby reducing the range of possible RB allocations and eliminating unnecessary fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If maximum size scheduling assignments are always used in PDCCH, then scheduling flexibility is maintained, but signaling overhead increases and coverage deteriorates
Solution Approach 1:
The patent implements dynamic SA size selection where the network configures UEs with multiple SA formats of different sizes (e.g., format 0 and format 1 with different resource block allocations). The appropriate SA size is dynamically chosen based on current channel conditions, traffic requirements, and UE capabilities, allowing the system to adapt between using larger SAs for flexibility and smaller SAs for reduced overhead and improved coverage.
Solution Approach 2:
The patent changes the parameter of SA size by introducing multiple SA formats with different numbers of resource blocks, different numbers of SC-FDMA symbols, and different subcarrier spacings. This allows the system to adjust the signaling overhead parameter dynamically while maintaining scheduling flexibility when needed, resolving the contradiction between overhead reduction and flexibility preservation.
2Adaptability or versatility
If maximum size scheduling assignments are always used in PDCCH, then scheduling flexibility is maintained, but coverage for UEs with poor channel conditions deteriorates
Solution Approach 1:
The patent implements dynamic SA size selection where the network configures UEs with multiple SA formats of different sizes (e.g., format 0 and format 1 with different resource block allocations). The appropriate SA size is dynamically chosen based on current channel conditions, traffic requirements, and UE capabilities, allowing the system to adapt between using larger SAs for flexibility and smaller SAs for reduced overhead and improved coverage.
Solution Approach 2:
The patent changes the parameter of SA size by introducing multiple SA formats with different numbers of resource blocks, different numbers of SC-FDMA symbols, and different subcarrier spacings. This allows the system to adjust the signaling overhead parameter dynamically while maintaining scheduling flexibility when needed, resolving the contradiction between overhead reduction and flexibility preservation.
3Quantity of substance
If compact SAs are used to reduce overhead, then signaling overhead decreases, but scheduling flexibility is reduced
Solution Approach 1:
The patent implements dynamic SA size selection where the network configures UEs with multiple SA formats of different sizes (e.g., format 0 and format 1 with different resource block allocations). The appropriate SA size is dynamically chosen based on current channel conditions, traffic requirements, and UE capabilities, allowing the system to adapt between using larger SAs for flexibility and smaller SAs for reduced overhead and improved coverage.
Solution Approach 2:
The patent changes the parameter of SA size by introducing multiple SA formats with different numbers of resource blocks, different numbers of SC-FDMA symbols, and different subcarrier spacings. This allows the system to adjust the signaling overhead parameter dynamically while maintaining scheduling flexibility when needed, resolving the contradiction between overhead reduction and flexibility preservation.
4Quantity of substance
If compact SAs are used to reduce overhead, then signaling overhead decreases, but coverage for UEs with poor channel conditions is not improved
Solution Approach 1:
The patent implements dynamic SA size selection where the network configures UEs with multiple SA formats of different sizes (e.g., format 0 and format 1 with different resource block allocations). The appropriate SA size is dynamically chosen based on current channel conditions, traffic requirements, and UE capabilities, allowing the system to adapt between using larger SAs for flexibility and smaller SAs for reduced overhead and improved coverage.
Solution Approach 2:
The patent changes the parameter of SA size by introducing multiple SA formats with different numbers of resource blocks, different numbers of SC-FDMA symbols, and different subcarrier spacings. This allows the system to adjust the signaling overhead parameter dynamically while maintaining scheduling flexibility when needed, resolving the contradiction between overhead reduction and flexibility preservation.
Data Source
AI summary
A system and method for performing Scheduling Assignments (SAs) for User Equipments (UEs) at a base station of a communication system by accounting for the different operating conditions UEs may experience or for the different data rates or data packet sizes UEs may require. This reduces a total size of SAs by introducing compact SAs, in addition to full SAs. For compact SAs, the range for the resource allocation or for the spectral efficiency of the signal transmission is restricted or some fields that exist in the full SA are eliminated without adversely impacting scheduling flexibility or system throughput. By reducing the total size of SAs through the use of compact SAs, the corresponding control signaling overhead is reduced, which improves system throughput, improves scheduling flexibility, or improves coverage.