EPDCCH Candidate Reallocation for Carrier Aggregation
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a challenge in effectively monitoring the downlink control channel, especially when carrier aggregation is involved, due to limitations in the number of enhanced control channel elements (ECCEs) available, which affects the allocation and support of EPDCCH candidates across different cells.
Innovation Solution
A method and apparatus that allow user equipment to receive and monitor enhanced physical downlink control channel (EPDCCH) information, reallocating EPDCCH candidates across cells when the maximum number of ECCEs on one cell does not support the required number for another cell, by adjusting the aggregation level and reallocating candidates from one cell to another, ensuring efficient monitoring and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of ECCEs is increased to support more EPDCCH candidates on one cell, then the reliability of control channel monitoring is improved, but the available resources for other cells in carrier aggregation are reduced
Solution Approach 1:
The patent implements dynamic reallocation of ECCE resources based on actual monitoring needs. The base station determines the number of ECCEs required for each cell's EPDCCH candidates and dynamically adjusts the allocation, allowing resources to be flexibly redistributed across multiple cells in carrier aggregation scenarios, thus resolving the contradiction between reliability for one cell and adaptability for multiple cells
Solution Approach 2:
The patent changes the parameter of ECCE allocation by introducing a reallocation mechanism where the number of ECCEs is adjusted based on the aggregation level and number of EPDCCH candidates. This parameter change allows the system to optimize resource distribution dynamically, improving both control channel reliability and multi-cell support capability
2Reliability
If the number of EPDCCH candidates is increased to support higher aggregation levels, then the coverage and reliability are improved, but the maximum number of ECCEs available becomes insufficient
Solution Approach 1:
The patent segments the ECCE resources into different pools that can be allocated to different cells and aggregation levels. By dividing the total ECCE resources and implementing selective allocation based on service requirements, the system can support higher aggregation levels for critical services while maintaining adequate resources for other cells, thus improving coverage without requiring a proportional increase in total ECCEs
3Productivity
If cross-carrier scheduling is implemented to improve resource utilization, then the efficiency of spectrum usage is improved, but the complexity of EPDCCH candidate allocation across cells increases
Solution Approach 1:
The patent applies local quality by implementing cell-specific ECCE allocation rules. Each cell has its own allocation parameters and constraints, allowing the base station to optimize resource distribution locally for each cell while maintaining overall system efficiency. This localized approach simplifies the allocation logic compared to a fully centralized complex allocation scheme, thus improving spectrum usage efficiency without excessive complexity
Data Source
AI summary
The present invention relates to a method for monitoring, by a terminal, an enhanced physical downlink control channel (EPDCCH) in a wireless communication system supporting carrier aggregation. In detail, the method includes the steps of receiving monitoring information about a first cell from a base station and a second cell cross-carrier scheduled from the first cell; and monitoring the EPDCCH on the basis of the monitoring information, wherein the monitoring information includes information that the number of EPDCCH candidates on the first cell is reallocated, when the maximum number of enhanced control channel elements (ECCE)) available in a specific EPDCCH set on the first cell does not support the number of the EPDCCH candidates of an aggregation level with respect to the second cell.