5G Downlink Control Channel Detection via Adaptive Search Space
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Solution Overview
Problem
In 5G wireless communication systems, existing technologies face challenges in efficiently detecting downlink control channels, leading to higher transmission delays and reduced reliability due to limited bandwidth and varying user equipment capacities.
Innovation Solution
A method where user equipment determines an initial control resource set and, after establishing an RRC connection, identifies a user-specific search space within this set based on information from the base station and user bandwidth or service type, allowing for adaptive configuration of control channel elements and mapping modes to optimize signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common control resource set is used for all users, then resource allocation is simplified, but user-specific search space determination becomes difficult leading to higher transmission delays
Solution Approach 1:
The control resource set is segmented into common control resource sets (for common control information) and user-specific control resource sets (for user-specific control information). This segmentation allows the system to maintain simplified common resource allocation while enabling efficient user-specific search space determination through dedicated resource sets, thereby reducing transmission delays.
2Reliability
If control resource sets are configured for all users, then user-specific search space can be determined, but device complexity increases
Solution Approach 1:
Different control resource sets are configured with different properties tailored to specific needs: common control resource sets use pre-configured parameters for all users, while user-specific control resource sets use dedicated parameters for individual users. This local quality approach improves detection reliability for each user without requiring all users to handle full complexity, as each user equipment only needs to process relevant resource sets.
3Reliability
If control resource sets are adaptively configured based on user bandwidth and service type, then transmission reliability improves, but determination complexity increases
Solution Approach 1:
The base station performs preliminary configuration of control resource sets based on user bandwidth capacity and service type before actual control information transmission. Configuration parameters including frequency domain resources, time domain resources, and CCE mapping types are pre-determined and notified to user equipment, enabling reliable adaptive configuration without requiring complex real-time determination at the user equipment side.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure discloses a method for detecting signals of a downlink control channel, including: determining, by a user equipment, an initial control resource set, and receiving common control information from resources specified in the initial control resource set before establishing a radio resource control (RRC) connection; after establishing the RRC connection, determining, by the user equipment, a first control resource set where a user-specific search space is located, and determining the user-specific search space from the first control resource set according to information sent by a base station and/or a user bandwidth capacity and/or a user service type; and detecting, by the user equipment, user control information in the user-specific search space determined. When the present disclosure is implemented, a lower transmission delay and higher transmission reliability can be achieved for a control channel.