Enhanced PHICH Transmission in PDSCH Region for LTE
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Solution Overview
Problem
The existing LTE-Rel-10 system's PHICH transmission is limited, particularly in scenarios like ABS sub-frames and extended carriers, leading to inefficiencies and increased system signaling overhead, which degrades performance.
Innovation Solution
The method involves transferring PHICH transmission from the legacy PDCCH region to the PDSCH region, using enhanced PHICH resources configured in the PDSCH region, where ACK/NACK feedback information is encoded, orthogonally spread, and mapped onto specific time-frequency resources, allowing for efficient transmission without increasing system signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PHICH transmission is performed in the legacy PDCCH region, then ACK/NACK feedback can be transmitted using existing resources, but transmission is limited in ABS sub-frames and extended carrier scenarios
Solution Approach 1:
The patent segments PHICH transmission from the legacy PDCCH region and creates a separate enhanced PHICH (E-PHICH) transmission mechanism in the PDSCH region. This segmentation allows PHICH to operate independently in different resource regions, enabling reliable transmission in ABS sub-frames and extended carrier scenarios where legacy PDCCH-based PHICH is unavailable.
Solution Approach 2:
The patent introduces an intermediary mapping mechanism that connects ACK/NACK feedback information to E-PHICH resources in the PDSCH region. This intermediary layer (comprising encoding, orthogonal spreading, and resource mapping) enables PHICH transmission to adapt to different transmission scenarios while maintaining compatibility with existing UE procedures.
2Quantity of substance
If PHICH resources are increased to support more users, then user capacity increases, but system signaling overhead and resource configuration complexity increase
Solution Approach 1:
The patent changes the resource location parameter from the legacy PDCCH region to the PDSCH region for E-PHICH transmission. This parameter change (transmission region) allows the system to support more users and diverse scenarios without increasing overall resource configuration complexity, as E-PHICH utilizes existing PDSCH resources that would otherwise be available for data transmission.
Solution Approach 2:
The patent makes PDSCH resources serve multiple functions: both data transmission and E-PHICH transmission. This multi-functionality allows the same physical resources to support both user data and ACK/NACK feedback, increasing user capacity without proportionally increasing resource configuration complexity.
3Reliability
If PHICH transmission is moved to PDSCH region, then transmission availability improves in ABS and extended carrier scenarios, but resource allocation and mapping complexity increases
Solution Approach 1:
The patent extracts PHICH transmission from the legacy PDCCH region and places it in the PDSCH region. This extraction resolves the transmission availability issue in ABS and extended carrier scenarios while managing complexity through standardized encoding and mapping procedures that reuse existing LTE physical layer mechanisms.
Solution Approach 2:
The patent enables E-PHICH to self-configure within the PDSCH region by utilizing existing downlink resource structures and UE reception procedures. The enhanced PHICH uses standard LTE encoding, modulation, and resource mapping mechanisms, allowing the system to handle the increased complexity through self-service rather than requiring additional complex control mechanisms.
Data Source
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AI summary
The present invention relates to the field of communications. Disclosed are a method and a device for feedback information transmission based on an enhanced PHICH. The method comprises transmitting ACK/NACK feedback information to a terminal through E-PHICH sources configured in a PDSCH area; therefore, on one hand, the problem that the PHICH cannot be transmitted in some scenarios, such as an ABS sub-frame of eICIC and a subsequent possibly-defined extended carrier, is solved; and on the other hand, the signaling overhead can be saved, so that the utilization rate of resources is improved, for example, the scheduling of retransmission of a PUSCH is prevented from being carried out by a system though a DCI format 0, therefore, the effects of improving the capacity of the PHICH and solving the problem of legacy PHICH resource contention are achieved.