HARQ Feedback Transmission via PDCCH Resource Mapping
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Solution Overview
Problem
In LTE systems, the limited PHICH resources and the requirement for combining control information with Cell-specific Reference Signals lead to insufficient control channel resources, especially with Carrier Aggregation, resulting in limitations in transmitting HARQ information for uplink data, particularly when New Carrier Type does not transmit CRS information.
Innovation Solution
A method and system for transmitting HARQ information by determining a control channel resource position using HARQ information and related information, allowing the base station to transmit downlink control information through indicated resources, enabling the UE to acquire HARQ information, while combining HARQ information with PDCCH/EPDCCH resource positions without increasing resource occupancy, thus saving time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PHICH resources are used to transmit HARQ information in LTE systems, then HARQ feedback can be provided, but control channel resources become insufficient when the number of users increases
Solution Approach 1:
The patent combines PHICH and PDCCH resources by determining PHICH resource positions through PDCCH resource allocation mechanisms. The base station determines control channel resource positions using HARQ information and downlink control information parameters (aggregation level, CIF indication value), effectively merging the previously separate PHICH and PDCCH resource management into a unified structure that improves resource utilization efficiency.
2Ease of operation
If control information transmission is combined with Cell-specific Reference Signals (CRS), then demodulation of control channels is enabled, but no CRS transmission in New Carrier Type (NCT) prevents PHICH resource transmission
Solution Approach 1:
The patent introduces PDCCH resource allocation as an intermediary mechanism to determine PHICH resource positions. Instead of directly relying on CRS for PHICH transmission, the system uses PDCCH aggregation level and CIF indication values as intermediate parameters to calculate and indicate PHICH resource positions, enabling PHICH transmission in NCT without requiring CRS.
3Productivity
If Carrier Aggregation technology is introduced to serve more users, then system capacity increases, but control channel resources become further insufficient
Solution Approach 1:
The patent makes the PDCCH resource allocation mechanism serve dual purposes: its original function for downlink control information transmission and the additional function of determining PHICH resource positions. By using the same aggregation level and CIF indication value parameters for both purposes, the system achieves multi-functionality that allows more users to be served through Carrier Aggregation without proportionally increasing control channel resources.
Data Source
AI summary
Disclosed are a method and a device for transmitting HARQ information, relating to the technical field of wireless communications. The method includes that: a base station receives uplink data of a user equipment (UE), and obtains hybrid automatic repeat request (HARQ) information of the uplink data; by using the HARQ information and related information used for transmitting downlink control information, a control channel resource position corresponding to the HARQ information is determined; and by using the control channel resources indicated by the control channel resource position, the downlink control information is transmitted to the UE so that the UE acquires the HARQ information.