Dynamic Downlink Control Channel Resource Allocation
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Solution Overview
Problem
Current mobile communications systems face challenges in supporting diverse services like wide coverage and low-latency services due to the inflexibility of fixed downlink control channels, which leads to inefficient spectrum utilization and potential bottlenecks in control channel reception.
Innovation Solution
A method and apparatus for dynamically or semi-statically configuring the downlink control channel, allowing user equipment to obtain and send downlink control channels by determining time-frequency resources based on reference signals, thereby increasing control channel capacity and reducing unnecessary resource occupation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a larger time-frequency resource area is reserved for control channels to support diverse services, then service diversity and coverage are improved, but spectrum utilization deteriorates
Solution Approach 1:
The patent implements dynamic control channel allocation where the time-frequency resource area for control channels is not fixed but adapts based on service requirements. The base station dynamically determines the control channel resource area size according to the types and quantities of user equipments requiring different services, allowing the system to support diverse services while minimizing resource occupation at any given moment.
Solution Approach 2:
The patent changes the parameter of control channel resource area size based on service conditions. By adjusting the time-frequency resource allocation parameters according to the detected service types and user equipment quantities, the system optimizes both service support capability and spectrum utilization efficiency.
2Quantity of substance
If an excessively small quantity of time-frequency resources are reserved for control channels, then spectrum utilization is improved, but control channel capacity deteriorates causing bottlenecks
Solution Approach 1:
The system dynamically adjusts control channel resource allocation based on real-time detection of user equipment service requirements. When many user equipments require control channels, the resource area expands automatically; when fewer equipments need control, the area contracts, thus preventing bottlenecks while optimizing spectrum utilization.
Solution Approach 2:
The base station autonomously detects the service types and quantities of user equipments, and automatically determines the appropriate control channel resource area without external intervention. This self-adjusting mechanism ensures control channel capacity matches actual demand, avoiding both bottlenecks and resource waste.
3Reliability
If reference signals are transmitted constantly to ensure control channel reception, then reliability is improved, but energy consumption deteriorates
Solution Approach 1:
Instead of continuous transmission, reference signals are transmitted periodically or only when control channels need to be sent. The base station transmits reference signals at specific intervals or triggered by control channel transmission needs, maintaining reception reliability while significantly reducing energy consumption compared to constant transmission.
Solution Approach 2:
The system transmits reference signals only when necessary for control channel reception, discarding unnecessary transmissions. By recovering and reusing time-frequency resources only when control channels are actually sent, the system maintains reliability while minimizing energy waste from redundant reference signal transmissions.
Data Source
AI summary
Embodiments of the present invention provide a method and an apparatus for transmitting a downlink control channel. The downlink control channel includes a first downlink control channel and a second downlink control channel. The first downlink control channel includes a first RS and first DCI. A method for receiving a downlink control channel by user equipment includes: obtaining a first RS time-frequency resource corresponding to the first RS; determining a first DCI time-frequency resource corresponding to the first DCI based on the first RS time-frequency resource; detecting the first RS on the first RS time-frequency resource, and demodulating the first DCI on the first DCI time-frequency resource by using the first RS; and determining a second time-frequency resource corresponding to the second downlink control channel based on the first DCI.