Control Channel Allocation in Wireless Search Spaces
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Solution Overview
Problem
In wireless communication systems, existing methods face challenges in efficiently assigning control channels, eliminating ambiguity, and performing blind detection, particularly in single/multi-carrier systems, leading to inefficiencies and potential blocking issues.
Innovation Solution
A method involving user equipment that monitors both common and user-specific search spaces for control channel candidates with identical RNTI, information size, and resource aggregation levels, receiving control channels only in the common search space, and performing cyclic redundancy checks to ensure accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If control channel candidates are monitored in both common search space and user equipment-specific search space, then blind detection capability is improved, but ambiguity and blocking issues occur
Solution Approach 1:
The patent segments the control channel monitoring into two distinct parts: common search space (CSS) and user equipment-specific search space (UESS). By dividing the monitoring process and applying different reception rules to each segment, the patent resolves the contradiction between improving blind detection capability and avoiding ambiguity/blocking issues.
Solution Approach 2:
The patent inverts the conventional approach by restricting control channel reception to only the common search space when candidates with identical parameters exist in both CSS and UESS, rather than allowing reception in both spaces. This inversion eliminates ambiguity while preserving blind detection capability.
2Productivity
If control channel candidates with identical parameters are received in both search spaces, then resource utilization is improved, but blocking issues occur
Solution Approach 1:
The patent applies local quality by treating the common search space and user equipment-specific search space differently. When control channel candidates with identical parameters (RNTI, information size, first control channel resource, aggregation level) exist in both spaces, the patent restricts reception to only the common search space, thereby preventing blocking while maintaining efficient resource utilization.
3Productivity
If control channel assignment is optimized for efficiency, then system performance is improved, but ambiguity in assignment occurs
Solution Approach 1:
The patent introduces the common search space as an intermediary that mediates between the need for efficient control channel assignment and the need to avoid ambiguity. By restricting reception of candidates with identical parameters to only the common search space, the patent eliminates assignment ambiguity while preserving system performance.
Data Source
AI summary
The present invention relates to a wireless communication system. More particularly, the present invention relates to a method in which a terminal performs a process for determining a control channel allocation for a control channel, and to an apparatus for the method. The method comprises the steps of: monitoring, on a specific carrier, a common search space including a control channel candidate set for the control channel; and monitoring, on the specific carrier, a terminal-specific search space including the control channel candidate set for the control channel. In cases where the terminal is set to monitor a plurality of control channel candidates having the same radio network temporary identifier (RNTI), same information size, same first control channel resource, and same control channel resource aggregation level in the common search space and the terminal-specific search space, the control channel candidate that satisfies the above conditions is received only in the common search space.