PUCCH Resource Allocation for LTE HARQ-ACK Transmission
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Solution Overview
Problem
In LTE wireless communication systems, the allocation of PUCCH resources for HARQ-ACK transmission is not adequately addressed, leading to potential overlap and interference between different mobile stations, which affects efficient communication.
Innovation Solution
A method is introduced where mobile stations and base stations determine PUCCH resources based on specific values indicated in system information blocks, using either PDCCH or ePDCCH, to ensure non-overlapping resource allocation for HARQ-ACK transmission, with optional reference signal generation based on physical layer cell identity or virtual cell identity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PUCCH resources are allocated dynamically based on PDCCH resources, then the base station can flexibly schedule multiple mobile stations, but PUCCH resources may overlap between different mobile stations using PDCCH and ePDCCH
Solution Approach 1:
The PUCCH resource space is segmented into two distinct allocation methods: one for mobile stations using PDCCH (based on PDCCH resource index) and another for mobile stations using ePDCCH (based on ePDCCH resource index and higher-layer configured offset). This segmentation prevents overlap between the two groups by using different determination formulas and parameter sets.
Solution Approach 2:
Different allocation strategies are applied to different mobile station groups based on their control channel type. Mobile stations using PDCCH have their PUCCH resources determined by the PDCCH resource index, while mobile stations using ePDCCH have their PUCCH resources determined by a combination of ePDCCH resource index and a higher-layer configured offset, creating locally optimized and non-conflicting resource allocations.
2Quantity of substance
If ePDCCH is introduced to increase mobile station capacity, then more mobile stations can be accommodated, but PUCCH resource allocation complexity increases
Solution Approach 1:
The patent creates a universal PUCCH resource allocation framework that handles both PDCCH-based and ePDCCH-based mobile stations through a unified determination process. The base station uses different formulas appropriate to each mobile station's control channel type, allowing the system to accommodate multiple mobile stations with diverse requirements without requiring separate allocation systems.
Solution Approach 2:
The higher-layer configured offset parameter is pre-configured for ePDCCH-based mobile stations before resource allocation occurs. This preliminary configuration simplifies the real-time allocation process by establishing a fixed reference point that prevents conflicts with PDCCH-based allocations, reducing the complexity of dynamic resource management.
3Ease of operation
If PUCCH resources are determined solely by control channel resource index, then allocation is simple, but resources may conflict between PDCCH and ePDCCH users
Solution Approach 1:
The PUCCH resource determination is made dynamic based on the mobile station's control channel type. For PDCCH-based stations, the resource is determined by the PDCCH resource index. For ePDCCH-based stations, the resource is determined by combining the ePDCCH resource index with a higher-layer configured offset. This dynamic adaptation ensures simplicity for each group while preventing conflicts between groups.
Data Source
AI summary
A terminal includes a determination unit that determines a PUCCH resource based on at least a first value in a case where downlink control information is detected with a PDCCH and a second value is not set, determines a PUCCH resource based on at least the second value in a case where the downlink control information is detected with the PDCCH and the second value is set, and determines the PUCCH resource based on at least the third value for the ePDCCH set with which the downlink control information is detected regardless of whether or not the second value is set in a case where the downlink control information is detected with the ePDCCH in the ePDCCH set. With this feature, a HARQ-ACK to a transport block transmitted on the PDSCH can be efficiently transmitted and received using a PUCCH.