PDCCH Allocation via Carrier Aggregation RRC Configuration
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Solution Overview
Problem
In wireless communication systems with Carrier Aggregation, unnecessary power consumption and computing complexity arise due to the need for user equipment to monitor all Physical Downlink Control Channels (PDCCHs) during retransmissions, even though scheduling information is only required for one PDCCH.
Innovation Solution
A method where the network terminal configures carriers via a radio resource control (RRC) message, including information indicating which carrier carries the PDCCH for each configured carrier, allowing the user equipment to selectively monitor only the necessary PDCCHs for downlink or uplink grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors all PDCCHs on all configured component carriers, then the UE can acquire scheduling information for all carriers, but power consumption and computing complexity increase
Solution Approach 1:
The invention extracts and identifies the specific PDCCH carrier that carries scheduling information for a given component carrier. Instead of monitoring all PDCCHs across all carriers, the UE is configured with specific PDCCH monitoring carriers through RRC signaling. This extraction principle allows the UE to take out only the necessary PDCCH monitoring tasks from the set of all possible PDCCHs, thereby reducing power consumption while maintaining reliable scheduling information acquisition.
2Reliability
If the UE monitors all PDCCHs on all configured component carriers, then the UE can acquire scheduling information for all carriers, but computing complexity increases
Solution Approach 1:
The invention applies the extraction principle by identifying and isolating the specific PDCCH carrier that contains scheduling information for each component carrier. Through RRC configuration, the network indicates which PDCCH carrier should be monitored for scheduling information related to each component carrier. This allows the UE to extract only the necessary blind decoding tasks from the complete set of PDCCHs, significantly reducing computing complexity while ensuring reliable acquisition of scheduling information.
3Productivity
If scheduling information is transmitted only on one PDCCH during retransmission, then resource usage is optimized, but the UE still needs to monitor all PDCCHs because it cannot determine which PDCCH contains the scheduling information
Solution Approach 1:
The invention applies the preliminary action principle by pre-configuring the UE with information about which PDCCH carrier carries scheduling information for each component carrier through RRC signaling before data transmission begins. This preliminary configuration enables the UE to know in advance which PDCCH to monitor for scheduling information, eliminating the need to monitor all PDCCHs during retransmissions. As a result, resource usage is optimized while power consumption is reduced, as the UE can directly monitor the pre-identified PDCCH carrier.
Data Source
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AI summary
A method for PDCCH allocation in a network terminal of a wireless communication system is disclosed. The wireless communication system supports Carrier Aggregation, which enables a UE of the wireless communication system to perform transmission and/or reception through multiple carriers. The method includes steps of configuring a plurality of carriers to a UE via an RRC message, and including an information for each configured carrier in the RRC message to indicate a second carrier which carries the PDCCH corresponding to a first carrier, wherein the PDCCH on the second carrier is used to transmit downlink assignment or uplink grant for the first carrier.