PUSCH ACK/NACK Feedback Timing for LTE TDD UpPTS
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Solution Overview
Problem
The existing LTE system lacks a solution for transmitting Acknowledgement (ACK)/Negative Acknowledgement (NACK) feedback information for a Physical Uplink Shared Channel (PUSCH) in an Uplink Pilot Time Slot (UpPTS) of the Long Term Evolution (LTE) Time Division Duplex (TDD) system.
Innovation Solution
A method and device for transmitting and receiving feedback information, where a User Equipment (UE) transmits a PUSCH in a special subframe and receives a Physical Hybrid Automatic Repeat Request Indicating Channel (PHICH) in a subsequent subframe, with the PHICH carrying feedback information, and a network-side device receives the PUSCH and transmits the PHICH accordingly, using preconfigured values for kPHICH to ensure timely feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UpPTS length is increased to enable PUSCH transmission, then uplink transmission capability is improved, but feedback information transmission support is worsened
Solution Approach 1:
The patent pre-configures the PHICH subframe index kPHICH in advance for special subframes, allowing the UE to know exactly which subframe will carry the ACK/NACK feedback. This preliminary configuration enables the system to support PUSCH transmission in UpPTS while ensuring feedback information can be reliably transmitted without requiring real-time determination of feedback subframes.
2Productivity
If PUSCH transmission is enabled in UpPTS, then data transmission efficiency is improved, but feedback mechanism compatibility is worsened
Solution Approach 1:
The patent applies different PHICH determination rules for different subframe types. For special subframes where PUSCH is transmitted in UpPTS, a specific kPHICH configuration is used that differs from normal uplink subframes. This localized adaptation allows the feedback mechanism to work correctly for PUSCH in UpPTS while maintaining compatibility with existing feedback mechanisms for other subframe types.
Solution Approach 2:
The patent changes the parameter kPHICH (PHICH subframe index) specifically for special subframes to enable feedback transmission. By configuring kPHICH to point to appropriate downlink subframes where PHICH can be transmitted, the system adapts the feedback mechanism parameters to work with PUSCH transmission in UpPTS, thereby improving compatibility without sacrificing data transmission efficiency.
Data Source
AI summary
The invention relates to the field of wireless communication technology, and in particular, to a method and device for transmitting and receiving feedback information, resolving a problem of providing ACK/NACK feedback of a physical uplink shared channel (PUSCH) transmission in an uplink pilot time slot (UpPTS). In one embodiment of the invention, the method comprises: a terminal transmits, in a special subframe n, PUSCH data, and receive, in a subframe (n+kPHICH), physical hybrid-ARQ indicator channel (PHICH) data corresponding to the PUSCH data, wherein a PHICH is used to carry feedback information of the PUSCH data; and a network apparatus receives, in the special subframe n, the PUSCH data, and transmits, in the subframe (n+kPHICH), the PHICH data corresponding to the PUSCH data. Therefore, the embodiment implements transmission of ACK/NACK of PUSCH data in an UpPTS.