Group Common PDCCH Resource Allocation for LTE Rate Matching
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Solution Overview
Problem
In existing LTE systems, the independent configuration of control resource sets for each terminal leads to unpredictable occupancy of control resources by other terminals, resulting in low downlink data transmission efficiency and reduced reliability due to overlapping resources.
Innovation Solution
A method where a base station configures resource sets or resource set subgroups for downlink data transmission and notifies terminals through explicit signaling whether all or specific resource sets or subgroups are used, allowing terminals to determine their time-frequency resource positions for receiving downlink data, thereby performing rate matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent control resource sets are configured for each terminal, then each terminal can have dedicated control resources, but resource overlapping occurs and downlink data transmission efficiency decreases
Solution Approach 1:
The patent merges control resource set configurations across multiple terminals by introducing a group-common PDCCH that broadcasts resource allocation information applicable to a group of terminals. Instead of each terminal having completely independent control resources, the system combines resource allocation into group-level configurations, thereby reducing resource overlapping while maintaining dedicated data resources for each terminal.
Solution Approach 2:
The patent introduces dynamic resource allocation through indication information that can change per scheduling instance. The group-common PDCCH dynamically indicates which resource sets are occupied by control channels for different terminals in each time slot, allowing the system to adapt resource allocation in real-time and avoid static resource conflicts that reduce transmission efficiency.
2Adaptability or versatility
If control resource sets are independently configured, then terminal-specific control can be achieved, but resource occupancy becomes unpredictable and errors increase
Solution Approach 1:
The patent implements feedback mechanisms where the base station monitors resource usage and sends indication information through group-common PDCCH to inform terminals about actual resource occupancy. This feedback loop allows terminals to adjust their resource allocation expectations based on actual control channel placements, making resource occupancy predictable while maintaining terminal-specific control capabilities.
Solution Approach 2:
The group-common PDCCH acts as an intermediary between the base station's resource allocation decisions and individual terminal configurations. It conveys information about which resource sets are occupied by control channels for different terminals, serving as a mediator that translates global resource allocation into terminal-specific actionable information, thereby ensuring predictability without sacrificing adaptability.
3Area of stationary object
If more control resource sets are allocated to handle overlapping, then resource coverage increases, but resource utilization rate decreases
Solution Approach 1:
The patent applies partial action by allocating control resources only where needed through dynamic indication. Instead of reserving control resources for all possible terminal configurations, the system uses group-common PDCCH to indicate only the specific resource sets that are actually occupied by control channels in each scheduling instance, avoiding waste of resources on unused control allocations while maintaining adequate coverage.
Data Source
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AI summary
A method for determining and configuring a resource used for transmitting downlink data, a terminal and a base station: the base station configures, for each terminal, resource collections or resource collection subgroups used for receiving downlink data, and then the base station notifies the terminal, by means of an explicit signaling, whether all of the resource collections or each resource collection of the configured resource collections are available, or whether all of resource collection subgroups or each resource collection subgroup of the resource collection subgroups are available, thus allowing the terminal to determine, according to the notification, the time-frequency resource position of a resource used to receive downlink data, so that the terminal may carry out rate matching on the determined resource.