Allocation Reference IE for MAC PDU Mapping in Multi-Hop Relay Networks
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Solution Overview
Problem
In non-transparent centralized scheduling multi-hop relay networks, the CID-based data transmission mode fails to effectively map data to corresponding bandwidth, leading to poor Quality of Service (QoS) performance due to variable delay and potential early forwarding of MAC PDUs when frames are lost, and lacks dynamic control over data transmission conditions.
Innovation Solution
The method involves inserting an Allocation Reference IE into the MAP message to indicate the position of MAC PDUs, allowing RSs to recombine and send data in allocated bandwidth, with fields like Num_Received Frames and Received Frame Index enabling flexible data mapping and handling of variable delays, and dynamic control through caching data during link condition changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CID-based data transmission mode is used in non-transparent centralized scheduling multi-hop relay networks, then data forwarding can be performed without CID fields in MAP IE, but data mapping to corresponding bandwidth fails and QoS performance deteriorates due to variable delay and early forwarding of MAC PDUs
Solution Approach 1:
The patent segments the data transmission process by introducing separate indication fields (Allocation Reference IE) that divide the mapping function into distinct components: one indicating the bandwidth allocation and another indicating the data position. This segmentation allows the RS to accurately map data to the correct bandwidth without relying on CID fields in MAP IE, thereby maintaining simplicity while improving QoS performance.
Solution Approach 2:
The patent introduces an intermediary indication mechanism (Allocation Reference IE with Num_Received Frames and Received Frame Index fields) that mediates between the received data and the bandwidth allocation. This intermediary provides the necessary mapping information without requiring CID fields in the MAP IE, resolving the contradiction between simplified MAP structure and accurate data mapping for QoS assurance.
2Adaptability or versatility
If variable delay is introduced in data forwarding, then flexibility in handling different transmission conditions is improved, but early forwarding of MAC PDUs occurs when frames are lost, worsening transmission reliability
Solution Approach 1:
The patent implements a feedback mechanism through the Allocation Reference IE that provides explicit information about the position of MAC PDUs and the number of received frames. This feedback allows the RS to determine whether to forward data immediately or wait for additional frames, preventing early forwarding when frames are lost while maintaining flexibility for normal variable delay scenarios.
Solution Approach 2:
The patent applies preliminary action by having the BS pre-indicate the data position and frame information in the Allocation Reference IE before the RS needs to make forwarding decisions. This preliminary information allows the RS to plan its forwarding action accurately, avoiding premature forwarding while maintaining the ability to adapt to different transmission conditions.
3Productivity
If centralized scheduling is implemented to unify resource allocation, then resource utilization efficiency is improved, but the system lacks dynamic control over data transmission conditions, worsening adaptability to sudden link changes
Solution Approach 1:
The patent introduces dynamics into the centralized scheduling system by enabling the BS to dynamically adjust the Allocation Reference IE based on current link conditions. The RS can dynamically control data transmission by interpreting the frame position information and making real-time decisions about when to forward data, combining the efficiency of centralized scheduling with the adaptability of dynamic control.
Data Source
AI summary
A data transmission and association method in a non-transparent centralized scheduling multi-hop relay network includes: when a base station sends data, an Allocation Reference Information Element (IE) will be filled in a mapping message (MAP), for indicating a position of a media access control protocol data unit (MAC PDU) to be transmitted; after a lower relay station receiving the mapping message (MAP) sent by the base station or transmitted by other relay station, the MAC PDU which is obtained according to the indication of the Allocation Reference IE is recombined, and then is put in the bandwidth allocated by the base station and sent downwardly.