Group-Based Spatial Stream Assignment Signaling in 60 GHz Networks
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Solution Overview
Problem
Conventional 60 GHz wireless communication techniques do not support downlink multi-user multiple-input multiple-output (MU-MIMO) capabilities, as they lack the ability to address multiple receiving devices and specify spatial stream assignments, limiting data transmission efficiency in 60 GHz wireless networks.
Innovation Solution
Implementing group-based spatial stream assignment signaling by configuring a 60 GHz-capable transmitting device to define DL MU-MIMO groups, manage group membership through management frames, and include group identifiers in physical layer headers to specify intended recipients and spatial stream assignments within protocol data units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional 60 GHz PHY header structure is used, then device compatibility is maintained, but multi-user MIMO capability is lost
Solution Approach 1:
The PHY header is segmented into multiple fields, with a dedicated Group ID field (6 bits) to identify DL MU-MIMO groups and spatial stream assignment fields to map spatial streams to specific STAs. This segmentation allows the header to carry multiple layers of information necessary for MU-MIMO operation without creating a monolithic complex structure.
Solution Approach 2:
The patent adds a new dimension of group-based addressing by introducing the Group ID field, which enables multi-user identification beyond traditional single-STA addressing. This dimensional addition allows the system to address multiple STAs simultaneously while maintaining the existing header format's compatibility.
2Productivity
If spatial stream assignment information is added to address multiple STAs, then data transmission efficiency is improved, but header overhead increases
Solution Approach 1:
The patent uses partial action by allocating 6 bits for Group ID (sufficient for 64 groups) and using compact spatial stream assignment fields that only specify the necessary mapping information. This partial allocation avoids excessive overhead while providing sufficient capability for MU-MIMO operation.
Solution Approach 2:
The patent changes the parameter structure by introducing group-based identification and assignment parameters rather than traditional per-STA addressing parameters. This parameter transformation enables efficient multi-user support with controlled overhead by organizing address information in a more compact, scalable manner.
3Productivity
If group-based addressing is implemented, then simultaneous transmission to multiple devices is enabled, but signaling complexity increases
Solution Approach 1:
The signaling is segmented into two distinct parts: group identification (Group ID field) and spatial stream assignment (assignment fields). This segmentation simplifies the overall signaling complexity by breaking down the complex task of multi-STA addressing into manageable, independent components that can be processed separately.
Solution Approach 2:
The Group ID acts as an intermediary that bridges the gap between traditional single-STA addressing and multi-STA MU-MIMO operation. By introducing this intermediate grouping layer, the system can efficiently manage multiple STAs without requiring complete redesign of the addressing mechanism, thus reducing signaling complexity.
Data Source
AI summary
Techniques for group-based spatial stream assignment signaling in 60 GHz wireless networks are described. According to various such techniques, a 60 GHz-capable transmitting device may be configured to define one or more DL MU-MIMO groups, each of which may comprise one or more respective 60 GHz-capable receiving devices. In various embodiments, the 60 GHz-capable transmitting device may include a DL MU-MIMO group ID within DL MU-MIMO control information in a PHY header of a PPDU in order to indicate that the PPDU is directed to a DL MU-MIMO group corresponding to that DL MU-MIMO group ID. In some embodiments, DL MU-MIMO control information may comprise information specifying spatial stream assignments for the 60 GHz-capable receiving devices of that DL MU-MIMO group. Other embodiments are described and claimed.