Multi-Link MPDU Sequence Numbering for Ordered Reception
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Solution Overview
Problem
In multi-link wireless systems, existing solutions fail to maintain the correct order of MPDUs due to the use of independent transmission sequence number spaces for different links, leading to disordered reception at the receiver.
Innovation Solution
A frame sequence number space is defined based on a triplet of unique identifiers for the transmitter and receiver, with MPDUs being assigned sequence numbers from this space to ensure correct transmission and reception order, using initial and updated transmission/reception windows to manage MPDU exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If each link uses independent frame sequence number spaces, then each link can independently manage its transmissions, but frame sequence numbers overlap across links causing the receiver to无法 distinguish the real order of received MPDUs
Solution Approach 1:
The patent merges the frame sequence number management across multiple links by introducing a global transmission order determination mechanism. The receiver determines the transmission order of MPDUs from multiple links and allocates a unified frame sequence number that reflects the actual transmission order, thereby combining the sequencing function across previously independent link spaces.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a global sequence number allocation system that mediates between independent link transmissions and the receiver's ordering requirements. This intermediary layer translates independent link sequence numbers into a unified global ordering that the receiver can use to correctly reconstruct the transmission order.
2Productivity
If multiple links are used for parallel communication, then throughput increases, but system complexity increases which may mitigate the benefits
Solution Approach 1:
The patent segments the complex multi-link sequencing problem into manageable parts by allowing each link to maintain its own transmission independence while introducing a separate global ordering layer at the receiver. This segmentation enables parallel link operation for high throughput while isolating the complexity of ordering management to a dedicated sequence number allocation mechanism.
3Ease of operation
If frame sequence numbers are allocated independently per link, then link-level autonomy is maintained, but correct reception order of MPDUs cannot be ensured
Solution Approach 1:
The patent applies local quality by allowing each link to maintain its own operational characteristics and independence (local autonomy) while the receiver applies a global ordering rule (global quality) to ensure correct reception order. Each link operates with its own sequence number space locally, but the receiver's global sequence number allocation ensures overall correctness.
Data Source
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AI summary
MPDU transmitting and receiving methods and apparatuses for a multi-link system, a storage medium, a transmitter, and a receiver. Said transmitting method comprises: determining a sequence number space, the sequence number space containing a plurality of sequence numbers, the sequence number space being defined on the basis of triplets <U-ID_t, U-ID_r, TID>, U-ID_t being used for representing the unique identifier of a transmitter, and U-ID_r being used for representing the unique identifier of a receiver; determining the transmission order of a plurality of MPDUs to be transmitted, each MPDU carrying an MSDU; according to the transmission order, sequentially obtaining the sequence numbers from the sequence number space; and transmitting the plurality of MPDUs in accordance with the transmission order. The solution of the present invention helps to solve the problem of disordered reception at a receiver during multi-link transmission.