LTE Feedback Information Transmission Using MAC PDU Segmentation
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Solution Overview
Problem
In LTE communications, when multiple UEs use a contention-based uplink data transmission mode, allocating the same uplink shared resource and DM-RS to multiple UEs leads to conflicts, preventing the eNB from correctly sending feedback information to each UE due to resource overlap.
Innovation Solution
A feedback information sending apparatus and method that allocates the same uplink shared resource to multiple UEs, includes a processor and transceiver to receive uplink data with unique identifiers, determines successfully received data, and generates feedback information with unique identifiers, sending it using a MAC PDU to ensure correct acknowledgement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same uplink shared resource and DM-RS are allocated to multiple UEs for contention-based transmission, then resource utilization efficiency is improved, but feedback information transmission reliability deteriorates due to resource conflicts
Solution Approach 1:
The feedback information is segmented into individual UE-specific feedback entries, each containing the UE identifier and corresponding acknowledgment status. This segmentation allows the eNB to provide differentiated feedback to each UE even when they share the same uplink resource, resolving the conflict between resource efficiency and feedback reliability
Solution Approach 2:
A feedback information structure is introduced as an intermediary that carries UE identifiers and acknowledgment information. This intermediary enables the eNB to distinguish between different UEs' feedback needs despite their shared uplink resource allocation, maintaining both resource efficiency and feedback reliability
2Measurement precision
If unique identifiers are included in uplink data for each UE, then feedback information accuracy is improved, but uplink data transmission complexity increases
Solution Approach 1:
The UE identifier is merged with the uplink data transmission in a unified MAC PDU structure. This combining approach allows the identifier to be included without requiring separate signaling channels or complex additional protocols, thus improving feedback accuracy while minimizing the increase in transmission complexity
3Productivity
If the eNB sends feedback information using agreed downlink resource calculated from uplink resource location, then feedback transmission efficiency is improved, but feedback delivery accuracy deteriorates when multiple UEs use the same uplink resource
Solution Approach 1:
The feedback information structure is designed with local quality differentiation, where each feedback entry is tailored to a specific UE based on its identifier. This allows the eNB to efficiently transmit feedback to multiple UEs using the same downlink resource while ensuring each UE receives accurate, UE-specific acknowledgment information
Data Source
AI summary
A method includes: allocating, by an eNB, a same uplink shared resource to m UEs, where m≥2; sending, by the UE to the eNB by using the uplink shared resource, uplink data that includes an identifier of the UE and/or buffer status information corresponding to the UE; generating according to successfully received uplink data, feedback information that includes the UE identifier and/or an uplink scheduling grant; and sending, by the eNB, the feedback information by using a MAC PDU, or sending acknowledgement information by using a downlink resource indicated by a combination of an agreed feedback location and an offset. A problem that an eNB cannot correctly send feedback information to each UE when the multiple UEs send uplink data by using a same uplink shared resource and DM-RS is resolved, so that each UE is clear about whether the uplink data of the UE is successfully sent.