Uplink Resource Allocation for Downlink Acknowledgement in Enhanced DCCH
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Solution Overview
Problem
In future radio communication systems like LTE-A, the shortage of downlink control channel capacity hinders the optimization of MU-MIMO transmission, leading to inadequate allocation of uplink radio resources for acknowledgment information of downlink shared data channels.
Innovation Solution
A radio communication method that frequency-division-multiplexes downlink control information with downlink shared data channels, configuring multiple resource sets with unique resource identifiers for user terminals, allowing them to determine uplink control channel resources based on offset values associated with these identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the downlink control channel capacity is expanded to transmit more downlink control information, then the system can support MU-MIMO transmission and broadbandization, but adequate uplink radio resources cannot be allocated for delivery acknowledgment information
Solution Approach 1:
The downlink control channel is divided into multiple resource sets (first resource set and second resource set), each with distinct resource identifiers. This segmentation allows the system to expand control channel capacity while maintaining separate resource allocation mechanisms for acknowledgment information, preventing resource conflicts in the uplink.
2Quantity of substance
If multiple resource sets of enhanced DCCH are configured to expand control channel capacity, then more downlink control information can be transmitted, but resource identifier collision occurs leading to inadequate uplink resource allocation
Solution Approach 1:
Each resource set is assigned a unique resource identifier (first resource identifier for the first resource set, second resource identifier for the second resource set). This local differentiation ensures that acknowledgment information from different resource sets can be allocated to distinct uplink resources, eliminating identifier collisions while maintaining manageable complexity through systematic resource tracking.
3Productivity
If downlink control information is transmitted using expanded downlink control channel, then system optimization for MU-MIMO is improved, but collision of uplink radio resources occurs
Solution Approach 1:
The system implements feedback mechanisms where the base station tracks which resource set (first or second) was used for transmitting downlink control information, and accordingly allocates specific uplink resources (first uplink resource or second uplink resource) for acknowledgment. This feedback-based resource mapping prevents uplink resource collisions while maintaining high MU-MIMO transmission efficiency.
Data Source
AI summary
A system and method for allocating adequate uplink radio resources for delivery acknowledgement information of a downlink shared data channel when downlink control information is transmitted using an enhanced downlink control channel is disclosed. A radio base station configures a plurality of enhanced PDCCH sets, which are each formed to include a plurality of enhanced control channel elements (eCCEs) allocated to the enhanced downlink control channel, for a user terminal, the radio base station transmits, to the user terminal, the downlink control information, to which resource identifiers (ARIs) are added, the resource identifiers being different between the plurality of enhanced PDCCH sets, and the user terminal determines radio resources for an uplink control channel that are used to transmit delivery acknowledgment information of the downlink shared data channel, based on offset values that are associated with the resource identifiers (ARIs).