LTE-A Control Channel Search Space Configuration for Resource Efficiency
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Solution Overview
Problem
In LTE-A communication systems, base stations face challenges in configuring sufficient uplink resources for mobile stations, leading to incomplete channel state information notification due to resource constraints and interference, which hampers efficient beamforming and control channel transmission.
Innovation Solution
The system configures a communication scheme that allows efficient transmission and reception of control information by using cooperative communication between base stations and RRHs, employing coordinated beamforming and pre-coding processes, and optimizing the configuration of control channels to improve resource utilization and signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station configures uplink resources for channel state information transmission, then the mobile station can provide beamforming feedback, but the resource consumption increases and interference occurs
Solution Approach 1:
The patent combines channel state information transmission with uplink data transmission by allowing mobile stations to multiplex channel state information onto the PUSCH (Physical Uplink Shared Channel). This merging eliminates the need for separate dedicated uplink resources for channel state information, thereby reducing overall resource consumption while maintaining complete feedback capability.
Solution Approach 2:
The uplink shared channel is designed to serve multiple functions simultaneously: it carries both user data and channel state information. This multi-functionality allows the same physical resources to be used for different purposes, improving resource utilization efficiency and reducing the total quantity of resources needed in the system.
2Reliability
If the base station applies beamforming using pre-coding, then the signal quality improves, but the device complexity increases due to channel estimation and pre-coding calculation
Solution Approach 1:
The mobile station performs preliminary channel estimation and determines the appropriate pre-coding matrix before transmitting data. By preparing the channel state information in advance, the base station receives ready-to-use feedback that directly indicates the optimal pre-coding to apply, reducing the computational complexity at the base station while maintaining signal quality through accurate beamforming.
Solution Approach 2:
The system implements a feedback mechanism where the mobile station measures the downlink channel quality and feeds back channel state information to the base station. This feedback enables the base station to adaptively select pre-coding matrices that match the current channel conditions, achieving high signal quality without requiring complex real-time calculations at the base station.
3Productivity
If multiple mobile stations share uplink resources, then the resource utilization efficiency improves, but the interference between mobile stations increases
Solution Approach 1:
The patent applies different uplink transmission configurations to different mobile stations based on their local channel conditions. Each mobile station receives customized resource allocation and transmission parameters (such as modulation scheme, coding rate, and power control) tailored to its specific channel quality and interference environment. This localized optimization allows efficient resource sharing while managing interference through station-specific adaptations.
Data Source
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AI summary
It is possible to efficiently transmit and receive signals including control information between a base station apparatus and a mobile station apparatus. A control channel is constituted of one or more first elements. The mobile station apparatus sets a search space for performing decoding detection of the control channel within a control channel region in which each of the first elements is constituted of resources in one physical resource block, and a search space for performing decoding detection of the control channel within a control channel region in which each of the first elements is constituted of second elements in a plurality of different physical resource blocks. Each of the second elements is resources obtained by dividing one physical resource block. The mobile station apparatus performs decoding detection of the control channel using the first elements in the set search spaces.