CCE Allocation Method for Wireless Base Stations
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Solution Overview
Problem
In LTE-Advanced (LTE-A) systems, the increased number of control information bits for resource allocation across multiple component bands leads to a high probability of CCE allocation blockage, particularly for LTE terminals, resulting in degraded throughput and increased power consumption for LTE+ terminals due to the need to receive PDCCH signals across multiple bands.
Innovation Solution
A base station and terminal configuration that dynamically allocates control information CCEs within a search space across multiple downlink component bands based on a threshold value, allowing flexible CCE allocation while minimizing terminal power consumption by concentrating PDCCH signals in one band for lower aggregation levels and distributing them across bands for higher levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If control information is allocated using a single downlink component band, then the number of CCEs to be allocated is reduced, but the probability of CCE allocation blockage increases
Solution Approach 1:
The patent divides the allocation of control information across multiple downlink component bands. When the number of CCEs to be allocated exceeds a threshold, the base station distributes allocation across multiple component bands rather than concentrating on a single band. This segmentation reduces the probability that all CCEs in one band will be blocked, thereby improving allocation reliability.
Solution Approach 2:
The patent introduces the dimension of multiple downlink component bands into the CCE allocation process. By transitioning from single-band allocation to multi-band allocation, the system gains additional spatial resources for control information, reducing the impact of blockage in any individual band while maintaining manageable complexity through threshold-based decision making.
2Reliability
If control information is distributed across multiple downlink component bands, then CCE allocation reliability improves, but the number of blind decoding operations for LTE+ terminals increases
Solution Approach 1:
The patent implements dynamic allocation strategies where the base station determines whether to distribute control information across multiple component bands based on real-time conditions, specifically the number of CCEs to be allocated and whether this exceeds a predetermined threshold. This dynamic approach allows the system to adapt between single-band and multi-band allocation modes, optimizing the balance between reliability and decoding complexity.
Solution Approach 2:
The patent uses the parameter of CCE aggregation level and the threshold value to control the allocation strategy. When the number of CCEs exceeds the threshold, the system changes its behavior by distributing across multiple bands. This parameter-based control mechanism ensures that multi-band allocation is activated only when necessary, minimizing unnecessary blind decoding operations for LTE+ terminals while maintaining reliability when needed.
3Adaptability or versatility
If LTE+ terminals receive PDCCH signals across multiple component bands, then CCE allocation flexibility improves, but power consumption increases
Solution Approach 1:
The patent applies partial action by having LTE+ terminals receive PDCCH signals across multiple component bands only when necessary, specifically when the number of CCEs to be allocated exceeds a predetermined threshold. When the threshold is not exceeded, the system uses single-band allocation, reducing the terminal's reception requirements and thereby lowering power consumption while maintaining flexibility when needed.
Data Source
AI summary
Disclosed is a wireless communication base station device that can suppress increases in terminal power consumption while being able to perform CCE allocation flexibly. In the device, a search space setting unit (103) sets search space for each wireless communication terminal device that communicates using multiple downlink unit bands. When the aggregation level of a CCE that is allocated control information addressed to the wireless communication terminal devices is less than a threshold value, an allocating unit (106) allocates the control information to a CCE inside the search space established in a single one of the multiple downlink unit bands. When the aggregation level is greater than the threshold value, the control information is allocated distributed to the CCEs inside the search spaces established for each of the multiple downlink unit bands.