Control Channel Resource Determination for ACK/NACK Feedback
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Solution Overview
Problem
In LTE communication systems, the limited capacity of control channels leads to resource conflicts between user equipment, particularly in heterogeneous networks with multiple remote radio units, where dynamically scheduled user equipment faces challenges in determining resources for feeding back uplink ACK/NACK information without interfering with other user equipment.
Innovation Solution
A method and user equipment that dynamically determine control channel resources by using sequence number information and antenna port information to avoid resource conflicts, allowing each user equipment to determine its own control channel resource for ACK/NACK feedback, thereby ensuring unique resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of user equipments scheduled by the base station is increased using MIMO technology and multiple RRUs, then the spectrum efficiency and service capacity are improved, but the required capacity of the PDCCH increases and resource conflicts occur
Solution Approach 1:
The patent segments the control channel resources by introducing RRU-specific parameters (n_RRU) into the PUCCH resource determination formula. This divides the原本 shared control channel resources into separate segments for different RRUs, allowing each RRU to have dedicated resource allocation without interfering with others, thus supporting increased service capacity while maintaining adequate PDCCH capacity.
Solution Approach 2:
The patent adds a new dimension to resource allocation by incorporating the RRU identifier (n_RRU) as an additional parameter in the resource determination equation. This transforms the original two-dimensional resource allocation (user equipment to resource) into a three-dimensional allocation (user equipment + RRU to resource), enabling finer-grained resource management and eliminating conflicts in heterogeneous networks.
2Productivity
If dynamic scheduling is used to improve communication system performance, then resource utilization is improved, but resource conflicts occur when multiple user equipment need to feed back ACK/NACK information simultaneously
Solution Approach 1:
The patent applies local quality by making the PUCCH resource determination locally unique for each user equipment through the combination of RRU-specific parameters and user-specific parameters (CCE index). This ensures that each user equipment has a locally unique resource allocation for ACK/NACK feedback, eliminating conflicts while maintaining dynamic scheduling flexibility.
3Quantity of substance
If the PDCCH capacity is enlarged by splitting resources from PDSCH area to create E-PDCCH, then control channel capacity is improved, but resource allocation complexity increases
Solution Approach 1:
The patent achieves universality by creating a unified resource determination formula that works for both traditional PDCCH and enhanced E-PDCCH scenarios. The formula PUCCH resource = f(n_RRU, n_CCE) serves multiple functions: it handles resource allocation for different RRU configurations, supports both PDCCH and E-PDCCH, and maintains backward compatibility with existing systems, thereby reducing overall allocation complexity despite increased capacity.
Data Source
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AI summary
The present invention discloses a method and a user equipment for determining a control channel resource. The method includes: detecting a downlink control channel that carries scheduling information of a downlink data channel and is sent by a base station, where the downlink control channel is formed by at least one control channel logical element, and the at least one control channel logical element is mapped to at least one antenna port; acquiring at least one of antenna port information of a first antenna port corresponding to a first control channel logical element of the successfully detected downlink control channel and an offset, and sequence number information of the first control channel logical element; and determining, according to at least one of the antenna port information and the offset, as well as the sequence number information, a first control channel resource used to feed back ACK/NACK information with respect to a downlink data channel corresponding to the successfully detected downlink control channel. By using the method and the user equipment according to embodiments of the present invention, a resource used to feed back the ACK/NACK information can be dynamically determined.