Enhanced Downlink Control Channel Resource Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE systems, the existing downlink control channel (PDCCH) has a coarse granularity due to its basic unit being a resource block pair, leading to resource wastage and an inability to efficiently manage increased numbers of UEs, necessitating an enhancement to improve resource allocation and performance.
Innovation Solution
The method involves dividing a multiplexing unit into multiple control channel elements, allowing for the transmission of enhanced downlink control channels (E-PDCCH) with each UE receiving its dedicated control channel element, reducing granularity and optimizing resource usage by using a precoding resource block group aligned with system bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the basic unit for downlink control channel is a resource block pair, then the control channel can be transmitted using standard LTE resource allocation, but the granularity is coarse leading to resource wastage and inability to efficiently manage increased numbers of UEs
Solution Approach 1:
The patent segments the resource block pair into multiple control channel elements (CCEs), where each CCE consists of multiple resource element groups (REGs). This segmentation enables finer granularity control channel allocation, allowing the system to efficiently manage increased numbers of UEs while reducing resource wastage by allocating only the necessary CCEs to each UE based on their specific needs.
2Adaptability or versatility
If more resources are allocated to PDCCH to adapt to increased UE numbers, then more control channels can be provided, but the resource allocation becomes less efficient and service data transmission capacity is reduced
Solution Approach 1:
The patent implements dynamic control channel allocation where the number of CCEs allocated to each UE varies based on their specific requirements. This dynamic approach allows the system to adapt to increased UE numbers by allocating more control channel resources when needed, while maintaining high service data transmission capacity by avoiding static over-allocation of control channel resources.
3Ease of operation
If the control channel occupies the front 3 OFDM symbols of all RBs, then control information can be transmitted to all UEs, but the control channel resources are fixed and cannot be flexibly allocated to individual UEs
Solution Approach 1:
The patent segments the control channel resources into multiple CCEs distributed across the time-frequency grid, allowing flexible allocation to individual UEs based on their specific needs. This segmentation enables the system to maintain the broadcast nature of control information transmission while simultaneously providing UE-specific flexible resource allocation, resolving the contradiction between ease of operation and adaptability.
Data Source
AI summary
The present invention discloses a method, a device and a system for transmitting an enhanced downlink control channel, which belong to the communications field. The method for sending an enhanced downlink control channel includes: presetting a multiplexing unit, where the multiplexing unit includes at least one resource block pair, and the at least one resource block pair includes E-PDCCH resources and DM RS resources, and the E-PDCCH resources include multiple control channel elements; sending at least one E-PDCCH corresponding to at least one UE in at least one control channel element of the multiplexing unit, and sending the DM RS corresponding to the at least one UE. The present invention reduces the granularity of an enhanced downlink control channel, saves resources and enhances the downlink control channel, thereby providing more control channels for the UE to use.