Common Search Space Configuration for IoT Coverage
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Solution Overview
Problem
Current MTC and NB-IoT technologies fail to meet the increasing demand for higher transmission rates and lower delays in Internet of Things services, particularly with the reduced capability UE, which results in coverage loss due to reduced bandwidth and antenna count, and the existing definition of type 0 common search space cannot support time domain repetition effectively.
Innovation Solution
A configuration parameter determination method that extends the time domain of the common search space by adding a dimension for the number of retransmissions, allowing for the determination of CCE aggregation levels and candidate transmission positions, thereby enabling repetition on the time domain to strengthen coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If reduced capability UE is used to reduce device complexity and cost, then device complexity is reduced, but coverage capability deteriorates due to reduced bandwidth and antenna count
Solution Approach 1:
The patent extends the common search space definition from frequency domain only to include time domain dimension by adding the parameter 'number of retransmissions'. This allows reduced capability UEs to achieve enhanced coverage through time domain repetition without increasing device complexity, as the additional dimension provides more transmission opportunities for reliable delivery.
2Adaptability or versatility
If MTC and NB-IoT technologies are used for Internet of Things services, then adaptability to low rate scenarios is improved, but transmission rate and delay performance deteriorate
Solution Approach 1:
The patent introduces dynamic configuration parameters including CCE aggregation levels and number of retransmissions that can be adjusted based on service requirements. This dynamic approach allows the system to adapt transmission resources according to actual needs, enabling both low rate IoT services and higher rate services with reduced delay by optimizing resource allocation flexibility.
3Reliability
If the common search space definition is extended to include time domain repetition, then coverage is enhanced through retransmissions, but the complexity of determining transmission resources increases
Solution Approach 1:
The patent defines specific configuration parameters (CCE aggregation level, number of retransmissions, candidate transmission positions) that control time domain repetition behavior. By parameterizing the extension rather than creating complex structural changes, the system enhances coverage while keeping the determination process manageable through standardized parameter sets that can be pre-configured or dynamically signaled.
Data Source
AI summary
A configuration parameter determination method includes: determining a first configuration parameter set, the first configuration parameter set being used for determining a transmission resource of a first type of common search space on the time domain, and the first configuration parameter set at least including: a control channel element (CCE) aggregation degree, and the number of retransmissions corresponding to the CCE aggregation level and/or the number of candidate transmission positions corresponding to the CCE aggregation degree.