Dynamic Search Space Structure for Mobile Network Communication
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Solution Overview
Problem
The current UMTS LTE communication systems face high processing complexity due to large CCE spaces, limiting the availability of suitable aggregations for varying channel conditions, especially at the cell edge or under interference, which restricts efficient communication between primary and secondary stations.
Innovation Solution
The method involves dynamically adapting the search space structure in response to changing channel conditions by configuring secondary stations to use different sets of resource sets, allowing for adjustments in decoding attempts based on current transmission characteristics without increasing signaling overhead, such as modifying the number of decoding attempts for different CCE aggregations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CCE space is large to cover all possible message locations, then the UE can receive any messages intended for it, but the processing complexity becomes prohibitive
Solution Approach 1:
The patent divides the large CCE space into multiple search spaces, each covering a specific subset of CCE locations. The UE only needs to perform blind decoding within these segmented search spaces rather than the entire CCE space, reducing processing complexity while maintaining the ability to receive messages intended for it.
Solution Approach 2:
The patent introduces dynamic search space configuration where the search space structure can be changed based on aggregation level and other parameters. This allows the search space to adapt to different message sizes and channel conditions, optimizing the balance between coverage and processing complexity.
2Device complexity
If the search spaces are restricted to reduce processing complexity, then the UE processing load is reduced, but the availability of suitable aggregations for different channel conditions is limited
Solution Approach 1:
The patent designs search spaces that can serve multiple aggregation levels (1-CCE, 2-CCE, 4-CCE, 8-CCE) simultaneously. A single search space configuration can accommodate different message sizes and channel conditions by supporting multiple aggregation levels, providing versatility without requiring separate search spaces for each condition.
Solution Approach 2:
The patent allows the search space parameters (such as starting position, number of CCEs, and aggregation level) to be changed dynamically based on channel conditions and message requirements. This enables the system to adapt to varying conditions while maintaining a controlled search space size that limits processing complexity.
3Ease of operation
If fixed search space configurations are used according to specification, then the UE knows where to search, but the system cannot adapt to changing channel conditions or interference
Solution Approach 1:
The patent introduces dynamic search space configuration where parameters such as the starting position, number of CCEs, and aggregation level can be changed based on channel conditions, interference levels, and message requirements. This allows the system to adapt to varying conditions while maintaining a structured approach that keeps implementation manageable.
Data Source
AI summary
A method for communicating between a primary station and at least one secondary station, comprising: configuring the secondary station to search at least one of a plurality of search spaces having a first structure, the first structure consisting of at least a first number of resource sets having a first size, where at least one resource set is for transmitting a message to the secondary station, and changing the search space structure to a second structure different from the first structure in response to a signalling message.