Uplink HARQ State Matching for Random Access Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The fixed use of Hybrid Automatic Repeat Request (HARQ) process 0 for uplink data transmission in random access processes leads to communication interruptions when the HARQ state of logical channels differs from the configured HARQ state, affecting communication efficiency and reliability.
Innovation Solution
A method where a network device configures specific HARQ states for each logical channel and HARQ process, allowing the terminal device to determine and use the appropriate HARQ state for data transmission on uplink grants, even when the configured HARQ state differs from the HARQ process 0.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HARQ process 0 is fixedly used for uplink data transmission on uplink grant, then the uplink data transmission can be simplified, but communication interruption occurs when HARQ state of logical channel differs from HARQ process 0 state
Solution Approach 1:
The patent applies dynamics by allowing the HARQ state to be flexible rather than fixed. The network device can dynamically adjust the HARQ state of HARQ process 0 through configuration messages, enabling it to adapt to different logical channel requirements (acknowledged mode or unacknowledged mode) while maintaining a unified process structure.
Solution Approach 2:
The patent changes the HARQ state parameter of HARQ process 0 based on the logical channel's requirements. When the logical channel requires acknowledged mode, the HARQ state is configured as acknowledged; when unacknowledged mode is needed, it is configured as unacknowledged. This parameter adjustment resolves the contradiction between fixed process structure and flexible state requirements.
2Reliability
If HARQ state is configured for each logical channel, then data transmission on logical channel can proceed, but device complexity increases due to multiple HARQ state configurations
Solution Approach 1:
The patent makes HARQ process 0 universal by enabling it to serve multiple logical channels with different HARQ state requirements. Through dynamic configuration, a single HARQ process can function in both acknowledged and unacknowledged modes, eliminating the need for separate HARQ processes for each logical channel while maintaining transmission reliability.
Solution Approach 2:
Instead of creating multiple HARQ processes with fixed states, the patent changes the state parameter of HARQ process 0 dynamically based on which logical channel needs to transmit data. This reduces configuration complexity while ensuring each logical channel gets the appropriate HARQ state for reliable transmission.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
This application provides a communication method, apparatus, and system. The method may include: receiving a random access response message, where the random access response message indicates a first uplink grant; determining a first hybrid automatic repeat request HARQ state, where the first HARQ state is a HARQ state of a first HARQ process, and the first HARQ process is a HARQ process used to send data on the first uplink grant; determining a second HARQ state, where the second HARQ state is a HARQ state allowed to be used when data on a first logical channel is sent; and when the first HARQ state is different from the second HARQ state, sending the data on the first logical channel on the first uplink grant based on the first HARQ state in the first HARQ process. When a HARQ state of a logical channel does not match a HARQ state of a HARQ process 0, the method is applied to avoid communication interruption, implement normal data transmission, and improve communication reliability.