Group Cast Retries in Multi-Link WLAN Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring reliable and low-latency group cast with retries (GCR) operations, particularly in multi-link environments, where compatibility with legacy devices and efficient use of multiple links are compromised.
Innovation Solution
The implementation of an access point multi-link device (AP MLD) that manages group cast with retries (GCR) in a multi-link operation (MLO) system, enabling retransmissions while maintaining backward compatibility with legacy devices, by using multiple links for GCR frame transmission and employing sequence number spaces, duplicate detection, and group temporal keys for encryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GCR service is implemented in multi-link systems, then reliability and latency of group cast delivery are improved, but compatibility with legacy devices deteriorates
Solution Approach 1:
The patent introduces GCR-capable stations as intermediaries that receive group cast frames from the AP, decode them, and retransmit to legacy stations. This mediator approach allows legacy devices to benefit from GCR reliability without requiring native GCR support, resolving the compatibility contradiction.
Solution Approach 2:
The system segments stations into GCR-capable and legacy groups, applying different transmission strategies. GCR-capable stations receive enhanced reliability treatment while legacy stations receive standard transmissions, allowing the system to improve overall reliability without forcing legacy device incompatibility.
2Productivity
If multiple links are used for GCR frame transmission, then productivity and reliability are improved, but device complexity increases
Solution Approach 1:
The patent merges multiple links into a unified GCR transmission system where the AP can select appropriate links for transmission and retransmission. By combining link management at the AP level rather than requiring coordination among all devices, productivity improves while complexity is centralized and managed.
Solution Approach 2:
The system adds the link dimension to GCR operations, allowing frames to be transmitted across different wireless links. This dimensional expansion enables parallel transmission paths that improve productivity while the AP manages the added complexity through link selection algorithms.
3Loss of time
If GCR-SPs are made link-specific with early termination capability, then latency is reduced and productivity is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements dynamic GCR-SP management where service periods can be terminated early based on transmission completion status. This dynamic adjustment allows the system to reduce latency by ending SPs sooner when possible, while the AP automatically manages the complexity of coordinating early terminations across links.
Data Source
AI summary
Embodiments are disclosed for group cast with retries (GCR) in a multi-link wireless communications system. In some embodiments, an access point (AP) multi-link device (MLD) can exchange information with a non-AP MLD to establish a GCR-multi-link operation (MLO) agreement corresponding to a group address, wherein the information includes, but is not limited to: a GCR primary link or a GCR primary link set of the AP MLD, an association identifier (AID) that corresponds to the group address. In some embodiments, the AP MLD can transmit a GCR frame subject to the GCR-MLO agreement, where the GCR frame includes a sequence number assigned from sequence number space (SNS)_GCR_MLO defined at a MLD level, and generate a Group Temporal Key (GTK)_GCR_ML at the MLD level, where the GTK_GCR_ML enables encryption and decryption of the GCR frame.