Antenna Port Determination for Control Channel Reception
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Solution Overview
Problem
In LTE Rel-8/9/10 communications systems, the limited capacity of the PDCCH restricts the number of user equipment that can be scheduled simultaneously, and the absence of PDCCH in a subframe prevents user equipment from obtaining the necessary DMRS antenna port for demodulating E-PDCCH, hindering correct reception of control channels.
Innovation Solution
User equipment determines the antenna port using a configuration parameter obtained through a preset protocol or higher-layer signaling, allowing it to correctly receive control channels without relying on PDCCH notification from the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If E-PDCCH is introduced to enhance PDCCH capacity, then the quantity of simultaneously scheduled user equipments increases, but the user equipment cannot obtain the DMRS antenna port number when the subframe has no PDCCH
Solution Approach 1:
The patent applies preliminary action by pre-configuring the DMRS antenna port number through higher-layer signaling before the E-PDCCH transmission occurs. This allows the user equipment to have the necessary antenna port information available in advance, eliminating the dependency on PDCCH for obtaining this critical parameter and enabling correct demodulation even when PDCCH is absent.
Solution Approach 2:
The patent introduces higher-layer signaling as an intermediary mechanism to transfer the DMRS antenna port number information from the base station to the user equipment. This intermediary channel ensures that the antenna port configuration is communicated reliably without requiring the presence of PDCCH, thus resolving the information loss problem.
2Reliability
If PDCCH is used to dynamically notify DMRS antenna port number, then the user equipment can demodulate E-PDCCH, but the system complexity increases due to dependency on PDCCH presence
Solution Approach 1:
The patent applies self-service by enabling the user equipment to independently determine the DMRS antenna port number through pre-configured higher-layer signaling, without requiring assistance or notification from PDCCH. This self-determination mechanism reduces system complexity by eliminating the conditional dependency on PDCCH presence while maintaining reliable demodulation capability.
3Reliability
If antenna port is determined through PDCCH notification, then correct reception is ensured when PDCCH is present, but reception fails when PDCCH is absent
Solution Approach 1:
The patent applies universality by making the antenna port determination mechanism universally applicable across all subframes, regardless of whether PDCCH is present or absent. The higher-layer signaling provides a universal method for obtaining antenna port information that works consistently in both PDCCH-present and PDCCH-absent scenarios, ensuring reliable reception under all conditions.
Solution Approach 2:
The patent uses preliminary action to pre-establish the antenna port configuration through higher-layer signaling before the actual E-PDCCH reception occurs. This advance preparation ensures that the user equipment has all necessary information ready, making the reception process adaptable and reliable whether or not PDCCH is present in the current subframe.
Data Source
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AI summary
Embodiments of the present invention provide a control channel resource transmission method, a user equipment, and a base station, which relate to the communications field and can determine an antenna port according to a corresponding parameter, thereby ensuring that a user equipment correctly demodulates and receives a control channel or a control channel element sent by a base station. The control channel resource transmission method includes: obtaining, by a user equipment, a configuration parameter in a candidate control channel set according to a preset protocol and/or higher-layer signaling sent by a base station, where the higher-layer signaling is used to notify the configuration parameter; determining an antenna port according to the obtained configuration parameter; receiving, by using the antenna port, a control channel or a control channel element sent by the base station; and determining, by the base station, the antenna port according to the same configuration parameter as that of the user equipment, and sending, by using the antenna port, the control channel or the control channel element to the user equipment. The embodiments of the present invention are applicable to control channel resource transmission.