Type 0 CSS Monitoring for RedCap PDCCH Coverage Compensation
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Solution Overview
Problem
Existing Machine Type Communication (MTC) and Narrow Band Internet of Things (NB IoT) technologies fail to meet the rate and latency needs of current IoT services, leading to coverage loss in Reduced Capability UE (RedCap UE) due to reduced antennas and bandwidth, with two repetitions in type 0 Common Search Space (CSS) being insufficient for Physical Downlink Control Channel (PDCCH) coverage enhancement.
Innovation Solution
Increase the number of slots for monitoring Common Search Space (CSS) and adjust monitoring symbols using different manners for RedCap UE, based on Synchronization Signal Block (SSB) mapping patterns and SubCarrier Spacing (SCS), to enable multiple repetition transmissions for coverage compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of slots for monitoring type 0 CSS is limited to two for RedCap UE, then the terminal complexity is reduced, but the coverage capacity deteriorates
Solution Approach 1:
The patent implements dynamic slot determination where the number of monitoring slots is not fixed but adapts based on terminal type. Different UE types (first type with lower capability, second type with higher capability) are assigned different numbers of monitoring slots within the same period, allowing the system to optimize between complexity and coverage capacity dynamically rather than using a static configuration for all terminals.
Solution Approach 2:
The patent applies local quality by differentiating monitoring slot allocation based on terminal capability. Instead of uniform treatment, each terminal type receives customized slot allocation - first type terminals get more slots for enhanced coverage while second type terminals get fewer slots to reduce complexity. This localized optimization allows each terminal to operate at its optimal complexity-coverage balance point.
2Device complexity
If two repetitions are performed for PDCCH broadcasting, then the terminal complexity is reduced, but the coverage enhancement is insufficient
Solution Approach 1:
The patent transitions from fixed two repetitions to dynamic repetition counts based on terminal type. First type terminals perform more repetitions to achieve sufficient coverage enhancement, while second type terminals perform fewer repetitions to maintain low complexity. This dynamic adjustment resolves the contradiction by matching repetition count to actual terminal needs rather than applying a one-size-fits-all approach.
Solution Approach 2:
The patent changes the parameter of repetition count based on terminal capability classification. By introducing terminal type as a distinguishing parameter, the system can adjust the number of PDCCH repetitions accordingly - increasing repetitions for first type terminals to compensate for reduced coverage capacity, and maintaining lower repetitions for second type terminals where complexity reduction is prioritized.
3Reliability
If the number of monitoring slots is increased for first type terminal, then the coverage capacity is improved, but the monitoring complexity increases
Solution Approach 1:
The patent applies local quality by allocating different monitoring slot quantities to different terminal types. First type terminals with lower capability receive more monitoring slots to ensure adequate coverage, while second type terminals with higher capability receive fewer slots. This localized differentiation ensures that complexity increases only where necessary (for first type terminals needing coverage enhancement) rather than uniformly across all terminals.
Solution Approach 2:
The patent implements dynamic monitoring slot allocation where the number of slots is determined based on terminal type identification. The system dynamically adjusts monitoring requirements - first type terminals monitor more slots within the period to achieve coverage targets, while second type terminals monitor fewer slots to minimize complexity. This dynamic approach allows the system to optimize the complexity-capacity tradeoff for each terminal type separately.
Data Source
AI summary
The present disclosure relates to communication methods, communication devices and storage media. The communication method includes determining the number of first slots, where the number of the first slots is the number of slots in which a first type Common Search Space (CSS) is monitored within a first period, and the number of the first slots is greater than the number of second slots. The number of the first slots is the number of slots in which the first type CSS is monitored by a first type terminal within the first period; the number of the second slots is the number of slots in which the first type CSS is monitored by a second type terminal within the first period.