Control Channel Mapping in Heterogeneous Networks
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Solution Overview
Problem
Existing radio network communication systems face inefficiencies in transmitting and receiving control channels, which limits the capacity and number of mobile stations that can be assigned control channels, particularly in heterogeneous networks with macro base stations and RRHs.
Innovation Solution
The implementation of a communication system that allows for efficient mapping of control channels by using UE-specific reference signals and coordinated precoding processes between base station devices and RRHs, enabling spatial multiplexing and beamforming to improve channel capacity and interference coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional control channel mapping is used in heterogeneous networks, then network coverage is provided, but channel capacity is limited and interference coordination is insufficient
Solution Approach 1:
The control channel mapping is segmented into two distinct regions: a first control channel region with first resource elements and a second control channel region with second resource elements. This segmentation allows independent configuration and optimization of each region, enabling enhanced control channel capacity without overwhelming complexity in the overall network configuration.
Solution Approach 2:
The patent introduces a new dimension to control channel mapping by utilizing both time-domain and frequency-domain resource elements to create multiple control channel regions. This dimensional expansion allows the system to increase control channel capacity by exploiting additional resource dimensions rather than simply increasing resources in a single dimension.
2Quantity of substance
If more mobile stations are assigned control channels, then system capacity increases, but interference management becomes more difficult
Solution Approach 1:
Different control channel regions are configured with different local qualities - the first control channel region and second control channel region use different resource element allocations and precoding configurations. This allows the system to optimize performance for different mobile station groups while managing interference locally rather than globally, enabling support for more mobile stations.
Solution Approach 2:
The patent changes key parameters including resource element allocation, precoding matrix selection, and control channel region configuration to manage interference. By dynamically adjusting these parameters for different control channel regions and mobile stations, the system can accommodate more mobile stations while maintaining acceptable interference levels.
3Area of stationary object
If heterogeneous network with macro base station and RRH is deployed, then coverage is extended, but control channel mapping efficiency decreases
Solution Approach 1:
The patent introduces an intermediary control channel structure with multiple regions that mediates between the macro base station and RRH. The first and second control channel regions act as intermediaries that can be independently configured and precoded, allowing efficient control channel mapping across the heterogeneous network coverage area while maintaining mapping efficiency.
Solution Approach 2:
The control channel mapping is made dynamic through configurable parameters including the number and position of control channel regions, resource element allocations, and precoding matrix selections. This dynamic configuration allows the system to adapt to different heterogeneous network deployments while maintaining high mapping efficiency across extended coverage areas.
Data Source
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AI summary
A signal including control information is enabled to be transmitted and received efficiently between a base station device and a mobile station device. A plurality of physical resource block pairs are configured as control channel regions which are regions in which there is a probability of the control channels being mapped. First components are configured by resources divided from one of the physical resource block pair. The control channel is configured from an aggregation of one or more first components. An antenna port used to transmit the first component is selected from a plurality of kinds of combinations. When one combination is selected from the plurality of kinds of combinations, there is provided a second radio network resource control unit that selects the combination on the basis of at least one of parameters for determining a C-RNTI number assigned to the mobile station device, N1 which is a parameter unique for a terminal, and an initial value Cinit of a series of UE-specific RSs used for a second PDCCH.