Wireless Device Control Information Search Space Segmentation
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Solution Overview
Problem
Current communications networks face challenges in achieving efficient resource allocation and reduced packet latency, particularly with the introduction of short subframes, which increases the number of blind decoding attempts for wireless devices, leading to higher processing loads.
Innovation Solution
The method involves a network node transmitting control information messages in both a common search space and a device-specific search space, based on parameters, to efficiently grant resources to wireless devices operating with short Transmission Time Intervals (TTIs), reducing the number of blind decodes required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If short subframes are introduced to reduce packet latency, then packet latency is improved, but the number of blind decoding attempts increases leading to higher processing load
Solution Approach 1:
The patent segments the control information transmission by introducing two distinct search spaces (common search space and device-specific search space) with different monitoring configurations. This segmentation allows the system to reduce blind decoding attempts in the device-specific search space while maintaining comprehensive control information coverage, thereby reducing processing load while supporting short subframe operations that improve packet latency
Solution Approach 2:
The patent dynamically adjusts the monitoring behavior of wireless devices by configuring different search space parameters (such as monitoring occasions, aggregation levels, and candidate numbers) based on traffic conditions and device requirements. This dynamic configuration enables the system to adaptively reduce blind decoding attempts during short subframe operations, lowering processing load while maintaining the low latency benefits
2Device complexity
If the number of blind decoding attempts is reduced to lower processing load, then device complexity is improved, but control information delivery reliability may deteriorate
Solution Approach 1:
The patent merges the control information transmission functionality into two complementary search spaces: a common search space that provides reliable baseline control information delivery for all devices, and a device-specific search space that provides additional scheduling flexibility. This merging ensures that control information delivery reliability is maintained through the common search space while the device-specific search space enables reduced blind decoding attempts, thus lowering processing load
3Productivity
If device-specific search space monitoring is increased to improve resource allocation efficiency, then productivity is improved, but processing load increases
Solution Approach 1:
The patent applies local quality by configuring device-specific search spaces with optimized parameters tailored to specific devices or device groups. By adjusting monitoring occasions, aggregation levels, and candidate numbers locally for different devices based on their traffic patterns and channel conditions, the system achieves high resource allocation efficiency for each device while avoiding uniform high processing loads across all devices
Data Source
AI summary
There is provided mechanisms for granting resources to a wireless device operating with a short Transmission Time Interval (sTTI). A method is performed by a network node. The method comprises transmitting, to the wireless device, a first control information message for a downlink channel. The method comprises transmitting, to the wireless device, a second control information message in a device-specific search space (USS), or in a common search space (CSS), based on a parameter of the first control information message.