MAC PDU Segmentation for Multi-UE Cooperative Data Routing
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Solution Overview
Problem
Current multiple UEs cooperative communication methods lack effective implementation on the MAC layer, leading to unreliable and inefficient data transmission.
Innovation Solution
A method and device for transmitting downlink data in multiple UEs cooperative communication, where a base station selects a benefitted UE and a supporting UE within a closed cooperative group, generates a MAC PDU with unique logical channel identifiers, and sends it to the supporting UE, which then forwards the data to the benefitted UE through a short-range communication link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple UEs cooperative communication is implemented without MAC layer support, then cross-UE data transmission can be achieved, but transmission reliability and efficiency deteriorate due to lack of proper identification and routing mechanisms
Solution Approach 1:
The patent segments the MAC PDU into multiple parts, each containing data from different UEs, and uses LCID to identify and separate these segments. This allows the supporting UE to correctly route different data segments to the appropriate benefitted UE, improving transmission reliability without requiring complex end-to-end protocols.
Solution Approach 2:
The supporting UE acts as an intermediary that receives MAC PDUs from the base station, identifies the intended benefitted UE through LCID, and forwards the appropriate data segments. This intermediary mechanism enables reliable cross-UE transmission while keeping the base station's scheduling logic simple and avoiding complex peer-to-peer protocols between UEs.
2Measurement precision
If unique LCID is assigned to each data radio bearer in the cooperative group, then data routing accuracy improves, but identification complexity increases
Solution Approach 1:
The patent extends the existing LCID mechanism, originally designed for single-UE radio bearers, to serve multiple UEs in cooperative groups. The same LCID structure and interpretation rules are universally applied across all UEs in the group, allowing accurate data routing without requiring new identification schemes or increasing complexity in identifier management.
3Productivity
If base station schedules data to supporting UE for forwarding, then transmission efficiency improves through cooperative communication, but scheduling complexity increases
Solution Approach 1:
The patent enables the supporting UE to autonomously determine which data segments to forward to which benefitted UE by examining the LCID in the received MAC PDU. This self-service mechanism allows the base station to schedule data efficiently without complex multi-step coordination protocols, as the supporting UE independently resolves the forwarding decisions based on the embedded LCID information.
Data Source
AI summary
Embodiments of the present invention provide a method and a device for transmitting downlink data in multiple UEs cooperative communication. A base station selects a benefitted user equipment UE, where the benefitted UE and a supporting UE are UEs in a closed cooperative group, each data radio bearer of each UE in the cooperative group corresponds to a logical channel identifier LCID, and the LCID is unique in the cooperative group; the base station generates a media access control packet data unit MAC PDU, where the MAC PDU comprises data to be sent by a data radio bearer of the benefitted UE, and a LCID corresponding to the data radio bearer, and the base station sends the MAC PDU to the supporting UE. The above solutions achieve a method of multiple UEs cooperative communication for synthesizing on the MAC layer.