Downlink Control Channel Resource Allocation in LTE
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting downlink control information while minimizing inter-cell interference, particularly in LTE-based systems, which affects the performance and resource utilization of wireless communication networks.
Innovation Solution
The method involves a user equipment (UE) receiving a first control channel indicating the position of a second control channel within a specific subframe, allowing it to acquire downlink and uplink grants from the second control channel, which is allocated to resources within the data region of the subframe, and utilizing a third control channel to confirm the transmission of the second control channel, thereby optimizing resource allocation and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink control information is transmitted in the control region, then control information delivery is reliable, but resource utilization efficiency deteriorates due to dedicated control region allocation
Solution Approach 1:
The patent segments control information transmission into two parts: essential control information remains in the control region for reliability, while additional downlink control information is transmitted in the data region to improve resource utilization. This segmentation allows the system to maintain reliable control delivery while efficiently using available resources.
Solution Approach 2:
The patent extends control information transmission from the traditional one-dimensional control region into the data region dimension. By utilizing the data region for additional control information transmission, the system achieves better resource utilization without compromising the reliability provided by the control region.
2Loss of information
If multiple control channels are transmitted, then downlink control information completeness is improved, but inter-cell interference worsens
Solution Approach 1:
The patent applies local quality by transmitting different control channels with different characteristics in different regions. The first control channel is transmitted in the control region with high reliability, while the second control channel is transmitted in the data region with optimized resource allocation, reducing overall inter-cell interference while maintaining information completeness.
Solution Approach 2:
The patent uses resource allocation information as an intermediary to coordinate the transmission of multiple control channels. By providing detailed resource allocation information, the system enables UEs to properly receive and process control channels from different cells, reducing interference effects while maintaining complete downlink control information.
3Ease of operation
If control channels are allocated in the control region, then control information reception is simplified, but resource flexibility deteriorates
Solution Approach 1:
The patent introduces dynamic resource allocation for control channels in the data region. The resource allocation information dynamically indicates the time-frequency resources for the second control channel, allowing the system to adapt to varying traffic conditions and UE requirements while maintaining simplified reception through proper resource indication.
Solution Approach 2:
The patent makes the data region universal by enabling it to serve both data transmission and additional control information transmission functions. This multi-functionality increases resource allocation flexibility while the resource allocation information mechanism maintains reception simplicity for UEs.
Data Source
AI summary
A method for determining a starting symbol of a downlink control channel in a subframe including a plurality of symbols at a user equipment in a wireless communication system, the method includes receiving a parameter via a Radio Resource Control (RRC) layer signaling; and determining the starting symbol of the downlink control channel according to a type of the downlink control channel, wherein, if the downlink control channel is a first type, the starting symbol of the downlink control channel is determined to a first symbol of the subframe, and wherein, if the downlink control channel is a second type, the starting symbol of the downlink control channel is determined based on the parameter.