CCE Allocation for Multi-Beam Control Channels
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Solution Overview
Problem
In multi-beam communication environments, the use of millimeter wave bands for mobile communication systems faces interference issues between adjacent beams, which degrades performance, particularly for control channels that require lower error rates than data channels.
Innovation Solution
A method where a base station allocates control channel elements (CCEs) differently for main and adjacent beams based on interference information, prioritizing the main beam's control channel and adjusting CCE allocation orders and locations to minimize interference, using only the existing PDCCH region for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-beam is used to increase capacity, then capacity of one cell increases in proportion to the number of beams, but data of adjacent beams affect main transmission beam as interference causing performance deterioration
Solution Approach 1:
The control channel resources are segmented into different CCE allocation regions for main beams and adjacent beams. By dividing the control channel element space and allocating specific CCE indices to specific beams, the patent prevents interference between adjacent beams while maintaining multi-beam operation for increased cell capacity.
Solution Approach 2:
Different CCE allocation strategies are applied to different beams based on their specific characteristics. Main beams receive CCE allocations optimized for their service requirements, while adjacent beams use separate CCE regions to minimize interference. This localized optimization allows each beam to operate with appropriate resource quality.
2Productivity
If control channel uses same resources as data channel, then resource utilization improves, but control channel requires lower error rate than traffic channel so interference must be removed or avoided
Solution Approach 1:
The control channel elements are segmented into distinct allocation regions within the PDCCH structure. By creating separate CCE index ranges for different beams and services, the patent ensures that control channel transmissions are isolated from data channel interference while still utilizing the same physical PDCCH region for efficient resource usage.
3Adaptability or versatility
If ePDCCH region is used simultaneously with PDCCH region, then resource flexibility increases, but the invention aims to improve performance by using only existing PDCCH region through cooperative communication
Solution Approach 1:
The patent establishes predetermined CCE allocation patterns and interference coordination rules before control channel transmission. By pre-configuring which CCE indices are allocated to which beams and pre-coordinating interference avoidance strategies, the system achieves reliable control channel performance using only the existing PDCCH region without requiring additional ePDCCH resources.
Data Source
AI summary
A base station allocates at least one control channel element (CCE) to a first control channel earlier than allocating to the rest control channels other than the first control channel among a plurality of control channels corresponding to a first beam, when CCEs are allocated to the plurality of control channels corresponding to the first beam. Further, the base station allocates at least one CCE to the first control channel earlier than allocating to the rest control channels other than the first control channel among a plurality of control channels corresponding to a second beam, when CCEs are allocated to the plurality of control channels corresponding to the second beam.