PDSCH Transmission Control via HARQ PID Sequencing
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Solution Overview
Problem
In communication systems, the unavailability of PUCCH resources on primary component carriers can lead to delays and reliability issues in HARQ feedback, causing disorder in operation sequences when switching to secondary component carriers for HARQ information transmission.
Innovation Solution
The base station transmits a first PDSCH on a primary component carrier and determines its corresponding HARQ PID, and only transmits a second PDSCH after receiving HARQ information for the first PID on a secondary component carrier, ensuring that the HARQ information for the second PDSCH is not mistakenly identified as a retransmission by configuring different PIDs or delaying the second PDSCH transmission until the first HARQ information is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits PDSCH on primary component carrier and expects HARQ feedback, then communication reliability is improved, but if PUCCH resources are unavailable on primary component carrier, delays and reliability issues occur in HARQ feedback transmission
Solution Approach 1:
The patent introduces a secondary component carrier as an intermediary resource for HARQ feedback transmission when the primary component carrier's PUCCH resources are unavailable. The base station configures the terminal to switch to the secondary component carrier for transmitting HARQ information, thereby maintaining feedback reliability and timing without being constrained by the primary carrier's resource availability.
2Adaptability or versatility
If the terminal switches to secondary component carrier to transmit HARQ information, then PUCCH resource availability is improved, but operation sequence disorder occurs due to timing mismatches
Solution Approach 1:
The base station performs preliminary configuration of the secondary component carrier's time domain resources before the terminal needs to switch for HARQ feedback. By pre-configuring the timing relationships and resource mappings, the terminal can smoothly switch carriers without causing operation sequence disorder, maintaining stability in the communication protocol flow.
Solution Approach 2:
The patent implements a feedback mechanism where the base station monitors the terminal's HARQ feedback timing and adjusts the configuration of secondary component carrier resources accordingly. This feedback loop ensures that the operation sequences remain ordered and synchronized, preventing timing mismatches while maintaining the benefits of carrier switching.
3Productivity
If the base station transmits multiple PDSCH with same HARQ PID, then resource utilization is improved, but HARQ information identification becomes ambiguous causing mistaken retransmissions
Solution Approach 1:
The patent applies local quality differentiation by associating different time domain resources with different PDSCH transmissions even when they share the same HARQ PID. The base station configures specific time domain resource parameters (such as slot offset, start symbol) for each PDSCH, allowing the terminal to precisely identify which PDSCH the HARQ feedback corresponds to based on the local time resource context, thereby preventing mistaken retransmissions while maintaining resource utilization efficiency.
Data Source
AI summary
A transmission control method includes: transmitting, on a primary component carrier, a first physical downlink shared channel (PDSCH) to a terminal, and determining a first process identifier (PID) of a hybrid automatic repeat request (HARQ) corresponding to the first PDSCH; and before HARQ information of the first PID transmitted by the terminal is received on a secondary component carrier, not transmitting a second PDSCH to the terminal. Where a PID of an HARQ corresponding to the second PDSCH is the same as the first PID, and the secondary component carrier is provided for the terminal to transmit an HARQ of the PID.