E-HICH Resource Sharing for HSUPA Feedback Transmission
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Solution Overview
Problem
In High Speed Uplink Packet Access (HSUPA) systems, the demand for non-scheduling E-HICHs leads to a high demand for physical resources, limiting flexible scheduling and degrading system throughput, especially when supporting a large number of VoIP users.
Innovation Solution
Allocating and notifying a single type of scheduled E-HICH to user equipment (UE) for both scheduled and non-scheduled transmissions, allowing feedback information to be carried using the same E-HICH, which reduces the need for additional non-scheduling E-HICHs and conserves physical resources by sharing the same E-HICH for HARQ acknowledge, TPC, and SS messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate non-scheduling E-HICHs are allocated for non-scheduled transmission, then feedback information can be transmitted, but the demand for physical resources increases significantly
Solution Approach 1:
The patent merges the feedback information transmission for both scheduled and non-scheduled transmissions onto the same E-HICH resource. Instead of allocating separate E-HICH resources for non-scheduled transmission, the invention combines both feedback streams on a shared E-HICH, thereby reducing the total quantity of physical resources required while maintaining reliable feedback transmission for both transmission types.
Solution Approach 2:
The E-HICH is designed to serve multiple functions simultaneously - it carries feedback information for both scheduled transmission (ACK/NACK for E-DCH) and non-scheduled transmission (ACK/NACK for E-DCH non-scheduled and TPC/SS commands). This multi-functionality allows a single E-HICH resource to fulfill multiple feedback requirements, reducing the need for additional dedicated resources.
2Reliability
If multiple types of E-HICHs are configured for different transmission modes, then feedback can be provided accurately, but device complexity increases
Solution Approach 1:
The invention makes the E-HICH universal by enabling it to carry different types of feedback information (ACK/NACK for scheduled, ACK/NACK and TPC/SS for non-scheduled) on the same resource. This eliminates the need to configure and manage multiple separate E-HICH types, thereby reducing device complexity while maintaining feedback accuracy through appropriate information multiplexing.
Solution Approach 2:
The patent changes the parameter of E-HICH usage from dedicated-specific to shared-multiplexed. By altering how the E-HICH parameter is utilized (from single-purpose to multi-purpose through code multiplexing and information interleaving), the system achieves accurate feedback transmission without the complexity of configuring multiple separate E-HICH resources with different parameters.
3Reliability
If dedicated non-scheduling E-HICHs are allocated, then feedback information can be transmitted reliably, but system throughput decreases
Solution Approach 1:
By merging feedback information from both scheduled and non-scheduled transmissions onto the same E-HICH resource, the invention reduces the total number of dedicated feedback channels required. This frees up physical resources that can be reallocated to data transmission, thereby improving system throughput while maintaining reliable feedback transmission through efficient multiplexing of feedback information.
4Reliability
If separate E-HICH resources are allocated for scheduled and non-scheduled transmission, then feedback can be provided without interference, but flexibility in scheduling is limited
Solution Approach 1:
The invention introduces dynamic multiplexing of feedback information on the E-HICH. Instead of static allocation of separate E-HICH resources, the system dynamically interleaves and multiplexes feedback information from both scheduled and non-scheduled transmissions on the same resource. This dynamic approach maintains feedback reliability through proper separation and identification of feedback types while providing scheduling flexibility to adapt to varying traffic conditions.
Data Source
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AI summary
A method, a system and a device for transmitting feedback information are provided. The method involves that the network side allocates an enhanced dedicated channel hybrid automatic repeat request acknowledgement indicator channel (E-HICH) for a scheduled transmission type to a user and informs the user (301). When an unscheduled transmission or a semi-persistent scheduled transmission of the user is fed back, the corresponding feedback information is borne in the E-HICH of the scheduled transmission type according to the feedback manner of the unscheduled transmission (304).