EPDCCH Resource Mapping for Control Channel Capacity
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Solution Overview
Problem
The limited resources in the control region of wireless communication systems hinder the increase in system capacity, necessitating the use of downlink control channels in data regions for transmitting downlink control information, and existing resource assignment schemes are inadequate for efficient utilization.
Innovation Solution
The implementation of an enhanced control channel element (ECCE) and enhanced resource element group (EREG) mapping method for downlink control channel transmission in data regions, where resource elements are indexed using a frequency-first scheme and grouped into ECCEs consisting of 4 or 8 EREGs with specific remainder properties, allowing for efficient resource allocation across multiple physical resource-block pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If downlink control channels are transmitted in the control region, then control information can be transmitted, but the system capacity cannot be increased due to limited control region resources
Solution Approach 1:
The patent moves the downlink control channel transmission from the traditional control region (time dimension) to the data region (spatial dimension), specifically utilizing the physical downlink shared channel (PDSCH) resources. This dimensional shift allows control information to be transmitted without consuming control region resources, thereby enabling system capacity increase while maintaining control channel functionality.
2Adaptability or versatility
If enhanced control channel elements are defined for data region transmission, then resource assignment can be performed, but a new resource assignment scheme is required increasing system complexity
Solution Approach 1:
The patent changes the resource element indexing parameters from the conventional time-first scheme to a frequency-first scheme. Specifically, resource elements are indexed by repeatedly using 16 numbers according to frequency-first ordering, and enhanced resource element groups are formed based on this new indexing. This parameter change enables efficient resource assignment in the data region while maintaining a systematic and manageable complexity level.
Solution Approach 2:
The patent applies different resource element grouping strategies to different local regions within the data region. Enhanced resource element groups are formed by grouping resource elements with identical indices, and enhanced control channel elements are constructed by selecting specific EREGs based on remainder properties when divided by 4 or 2. This localized quality approach optimizes resource assignment for control channel transmission while preserving the overall system structure.
Data Source
AI summary
The disclosure is related to transmitting control information in a transmission/reception point and to receiving the control information in user equipment. Particularly, the present disclosure relates to transmitting the control information for user equipment which receives downlink control information through a downlink control channel newly defined in a data region. Furthermore, the present disclosure relates to performing a resource mapping for enhanced control channel elements (ECCEs) of an enhanced physical downlink control channel (EPDCCH).