Uplink Control Resource Allocation for Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in uplink control resource allocation, particularly with enhanced physical downlink control channels (ePDCCH), leading to excessive ACK/NACK channel overhead due to one-to-one indexing, which can result in collisions as the number of users and control channel candidates increases.
Innovation Solution
An apparatus and method for determining an index for uplink control resources based on a predefined rule, considering the index associated with a physical downlink resource and the amount of downlink resources to be mapped, using an offset parameter and configurable parameters like antenna port indicators and scrambling identities to avoid collisions and enable dynamic switching between PUCCH formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-to-one indexing is used for PUCCH resource allocation based on ePDCCH candidates, then each user can be uniquely identified, but the number of ACK/NACK channels increases excessively leading to uplink overhead
Solution Approach 1:
Multiple ePDCCH candidates from different users are merged into a shared PUCCH resource space. Instead of allocating dedicated PUCCH resources to each ePDCCH candidate, the patent combines multiple candidates and maps them to common PUCCH resources, reducing the total number of ACK/NACK channels while maintaining user identification through implicit indexing rules
Solution Approach 2:
PUCCH resources are designed to serve multiple ePDCCH candidates from different users simultaneously. The same PUCCH resource can carry ACK/NACK feedback for multiple users, making the uplink control channel universal and multi-functional, thereby reducing uplink overhead while supporting multiple users
2Adaptability or versatility
If the number of ePDCCH candidates increases to support more users and MU-MIMO scheduling, then system capacity improves, but the number of required PUCCH resources increases leading to collisions
Solution Approach 1:
The patent segments the large number of ePDCCH candidates into groups that can be mapped to a smaller number of PUCCH resources. By dividing and conquering, multiple candidates are organized into manageable groups that share common uplink resources, preventing resource exhaustion and collisions while supporting high system capacity
Solution Approach 2:
The patent introduces implicit indexing rules that add a new dimension to resource allocation. Instead of directly mapping each candidate to a unique PUCCH resource in one-to-one fashion, the system uses dimensional transformation through indexing rules that map multiple candidates to shared resources, adding complexity in the mapping domain while simplifying the actual resource space
3Ease of operation
If dedicated ACK/NACK channels are allocated to each user, then user identification is clear, but resource allocation overhead increases significantly
Solution Approach 1:
Users self-identify their PUCCH resources through implicit indexing rules based on their ePDCCH candidate indices. Instead of the network explicitly assigning dedicated channels to each user, the system provides the indexing rules and parameters, allowing users to autonomously determine their resources, thereby reducing network overhead while maintaining clear identification
Data Source
AI summary
The disclosure relates to the allocation of resources for wireless communications. An index for an uplink control resource is determined in accordance with a predefined rule. The determining takes into account an index associated with a physical downlink resource and the amount of downlink resources to be mapped on the uplink control resource.