MUP Grouping by HARQ Behavior for Wireless Reliability
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Solution Overview
Problem
In wireless communication, the transmission of redundant packets to multiple access terminals wastes channel resources due to the shared nature of the wireless link, and the inefficiency in using multi-user packets (MUPs) is exacerbated by the need for retransmissions when even a single terminal fails to receive data, causing delays for all members of the group.
Innovation Solution
The method involves determining candidate access terminals based on their HARQ behavior and forming groups to send data using MUPs, with the ability to reorganize these groups based on new HARQ responses to minimize retransmissions and optimize data delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant packets are transmitted to multiple access terminals, then data delivery reliability is improved, but channel resource wastage increases
Solution Approach 1:
The patent combines multiple individual packet transmissions into a single multi-user packet (MUP) that is transmitted once to multiple access terminals simultaneously. This merging approach eliminates redundant transmissions while maintaining reliability, as all terminals in the group receive the same packet through the shared wireless channel without needing separate transmissions for each terminal.
2Productivity
If multi-user packets are used to serve multiple terminals, then channel resource efficiency is improved, but retransmission delays increase for all group members when one terminal fails to receive data
Solution Approach 1:
The patent segments the access terminals into different groups based on their HARQ behavior characteristics. By dividing terminals into groups with similar reception patterns, the system can target retransmissions more precisely. When a terminal fails to receive a MUP, only terminals in the same group need retransmission, rather than requiring retransmission for all group members, thus reducing overall delay while maintaining efficiency.
Solution Approach 2:
The patent utilizes HARQ (Hybrid Automatic Repeat Request) feedback mechanisms where access terminals send acknowledgment signals back to the base station. This feedback allows the system to identify which terminals successfully received the MUP and which ones failed, enabling selective retransmission only to terminals that need it, thereby minimizing unnecessary delays for terminals that received the data successfully.
3Productivity
If access terminals are grouped for MUP transmission, then data delivery efficiency is improved, but group formation complexity increases
Solution Approach 1:
The patent changes the parameter used for terminal classification from individual packet-level characteristics to group-level HARQ behavior patterns. By aggregating terminal behavior into observable HARQ response patterns (ACK/NACK sequences), the system can automatically form groups based on these patterns without complex analysis. This parameter transformation simplifies the grouping process while enabling efficient MUP transmission to homogeneous groups.
Data Source
AI summary
A plurality of candidate access terminals for participation in a multi-user packet-based (MUP-based) communication are determined. Two or more candidate access terminals are grouped into a MUP-based group, the grouping based on a hybrid automatic repeat request behavior of the plurality of candidate access terminals. Data is sent to the MUP-based group using a multi-user packet.