Extended Control Channel Resource Segmentation
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Solution Overview
Problem
The LTE control channel in radio communications networks faces limitations in capacity and relies on common reference signals for demodulation, which reduces network performance.
Innovation Solution
The introduction of an extended control channel with resource elements reserved for 4G user equipment, allowing for improved capacity and the use of user equipment-specific reference signals, enabling beamforming and other non-backward compatible solutions, while maintaining interference-free integration with legacy control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If resource elements are reserved for extended control channel for 4G user equipment, then control channel capacity is improved, but device complexity increases
Solution Approach 1:
The resource elements are segmented into two distinct regions: a first region for legacy 3G user equipment control information and a second region for extended 4G user equipment control information. This segmentation allows the system to increase control channel capacity for 4G devices while maintaining compatibility with 3G devices, as each region operates independently with its own resource element allocations.
2Reliability
If user equipment-specific reference signals are used for beamforming, then network performance is improved, but ease of operation deteriorates
Solution Approach 1:
User equipment-specific reference signals are applied locally to the second region of resource elements dedicated to 4G user equipment, while the first region continues to use common reference signals. This local quality differentiation enables beamforming and improved network performance for 4G devices without affecting the operation of legacy 3G devices, thus maintaining ease of operation for the overall system.
3Productivity
If extended control channel is introduced for 4G user equipment, then productivity is improved, but loss of information increases
Solution Approach 1:
The system extends the control channel into a new dimension by allocating a second region of resource elements specifically for 4G user equipment, separate from the first region used by 3G equipment. This dimensional separation in the resource element space allows simultaneous support for both legacy and advanced devices without increasing blocking probability, as resource allocation in one region does not interfere with the other.
Data Source
AI summary
Embodiments herein relate to a method in a user equipment for handling control information in a radio communications network. The user equipment is served in a cell controlled by a radio network node and is of a second type of user equipments. The user equipment monitors a search space for control information of a physical data control channel, PDCCH, which search space is associated with the second type of user equipments. The PDCCH comprises at least one control channel element that comprises resource elements at least partly comprised in a second region of resource elements. The resource elements of the second region are only allowed to be scheduled for control information to user equipments of the second type. The at least one CCE is defined in relation to a CCE of a first region of resource elements, which resource elements of the first region are allowed to be scheduled for control information to user equipments of a first type. The user equipment detects control information within the monitored search space, and uses the detected control information for communicating with the radio network node.