User Terminal Search Space Control for Cross-Carrier Scheduling
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Solution Overview
Problem
In enhanced carrier aggregation for LTE, the increased number of component carriers leads to a higher processing load due to increased blind decoding times, which is not efficiently managed by existing cross-carrier scheduling methods.
Innovation Solution
A user terminal is designed to communicate with six or more component carriers, using higher layer signaling to determine a user terminal-specific search space on a per-component carrier basis, based on CIF values and cell indices, to reduce the number of blind decoding attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of component carriers is increased to six or more in enhanced carrier aggregation, then the wireless communication capacity and flexibility are improved, but the processing load on the user terminal increases due to increased blind decoding times
Solution Approach 1:
The patent segments the search space determination into two distinct parts: a common search space determined by formula based on aggregation level and CCE index, and a user terminal-specific search space determined by higher layer signaling based on CIF value and cell index. This segmentation allows the system to handle multiple component carriers efficiently without proportionally increasing blind decoding times, as the common search space provides a structured baseline while the user-specific portion adds only necessary customization.
2Adaptability or versatility
If cross-carrier scheduling is applied to enhanced carrier aggregation with six or more component carriers, then the scheduling flexibility is improved, but the number of blind decoding attempts increases in proportion to the number of component carriers
Solution Approach 1:
The patent applies preliminary action by pre-configuring the user terminal-specific search space through higher layer signaling before actual scheduling operations. The CIF value and cell index are预先 assigned to establish the search space location, so that when cross-carrier scheduling occurs with six or more component carriers, the user terminal already knows where to look for scheduling information, avoiding the need to perform blind decoding across all possible locations for each component carrier.
3Adaptability or versatility
If existing cross-carrier scheduling methods are used with increased component carriers, then the carrier aggregation capability is improved, but the efficiency of cross-carrier scheduling deteriorates due to increased processing load
Solution Approach 1:
The patent applies local quality by making the search space determination location-dependent through the cell index parameter. Different cell indices correspond to different search space locations, allowing efficient handling of multiple component carriers. Each component carrier has its specific search space location determined by the combination of CIF value and cell index, rather than using a uniform approach across all carriers, which optimizes the scheduling efficiency for enhanced carrier aggregation scenarios.
Data Source
AI summary
The present invention is designed so that it is possible to prevent the number of times to perform blind decoding from increasing in cross-carrier scheduling in enhanced carrier aggregation. A user terminal can communicate with a radio base station by using six or more component carriers, and has a control section that exerts control so that, when cross-carrier scheduling is configured by the radio base station and the number of component carriers to be scheduled by a scheduling-source component carrier exceeds a predetermined value, a user terminal-specific search space is determined on a per component carrier basis based on higher layer signaling that configures a CIF (Carrier Indicator Field) value in association with a cell index.