PUCCH Resource Allocation Offset for ePDCCH Collision Avoidance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 3GPP networks, the introduction of enhanced physical downlink control channel (ePDCCH) leads to potential resource allocation collisions due to the same uplink resources being allocated to different User Equipments (UEs) based on the lowest carrier control element (CCE) and enhanced CCE indices, which are sometimes identical.
Innovation Solution
The implementation of offset values for uplink resource allocation, specifically using a combination of radio resource control (RRC) signaling and antenna-specific offsets, to differentiate and avoid collisions, particularly in scenarios involving transmit diversity and carrier aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink resources are allocated based on the lowest CCE index of PDCCH, then each UE receives a unique uplink resource, but resource allocation collisions occur when ePDCCH is introduced and lowest CCE index equals lowest eCCE index
Solution Approach 1:
The patent changes the allocation parameter from using only the lowest CCE index to using a combination of the lowest eCCE index and an offset value. This parameter modification ensures that even when lowest CCE index equals lowest eCCE index, the final uplink resource allocation remains unique by incorporating the offset value into the calculation: uplink resource = lowest eCCE index + offset value
Solution Approach 2:
The patent introduces an offset value as an intermediary element between the eCCE index and the final uplink resource allocation. This offset value acts as a mediator that differentiates resource allocations between PDCCH and ePDCCH transmissions, preventing direct collision while maintaining the indexing relationship
2Productivity
If ePDCCH is introduced to enhance downlink control capacity, then network throughput increases, but resource allocation complexity increases due to potential collisions between PDCCH and ePDCCH allocations
Solution Approach 1:
The patent modifies the resource allocation parameter by introducing an offset value that is added to the lowest eCCE index. This parameter change simplifies the allocation process by providing a straightforward calculation method that simultaneously supports both PDCCH and ePDCCH transmissions without requiring complex collision detection and resolution mechanisms
Data Source
AI summary
Embodiments of the present disclosure include methods, apparatuses, and instructions for receiving at a user equipment (UE) of a third generation partnership project (3GPP) network an offset value selected from a plurality of offset values in downlink control information. The UE also receives one or more enhanced control channel elements (eCCEs) of an enhanced physical downlink control channel (ePDCCH). The UE may then determine an allocation of an uplink resource for a transmission on a physical uplink control channel (PUCCH) based at least in part on the index of a first eCCE and the offset value.