MoCA Reservation Request Element DFID Encoding
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Solution Overview
Problem
The existing MoCA network RRE format lacks a field to represent unique DFIDs for unicast PQoS flows, limiting the network coordinator's ability to perform certain functions and increasing overhead when attempting to add such fields, which reduces data transmission efficiency.
Innovation Solution
The proposed solution modifies the MoCA Reservation Request Element format to include a 'Priority_DFID' field and a 'HIGH_BIT' field, allowing the representation of a five-bit DFID value without expanding the RRE size, enabling the communication of up to 32 unique unicast PQoS flows per ingress node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a field is added to represent DFID for unicast PQoS flows in the RRE format, then the network coordinator's ability to perform functions is improved, but the RRE size increases causing reduced data transmission efficiency
Solution Approach 1:
The existing RRE fields are designed to serve multiple purposes. The PRIORITY field can represent either priority information or DFID information depending on the flow type, and the TOTAL_SIZE field can represent either size information or additional DFID bits. This multi-functionality allows the system to support unicast PQoS flows with DFID representation without increasing the overall RRE size, thereby maintaining data transmission efficiency while enhancing network coordinator capability.
2Adaptability or versatility
If the RRE format is expanded to include DFID fields, then support for unique unicast PQoS flows is improved, but the overhead increases reducing network performance
Solution Approach 1:
The patent changes the interpretation and parameter values of existing RRE fields based on the flow type. For unicast PQoS flows, the PRIORITY field is reinterpreted to carry DFID information instead of priority information. Additionally, reserved bits in the TOTAL_SIZE field are utilized to carry additional DFID bits. This parameter change approach allows the system to support unique unicast PQoS flows identified by DFID without adding extra overhead, as the same bit space is reused with different meanings depending on the flow context.
3Productivity
If existing RRE format is used without DFID field, then data transmission efficiency is maintained, but the ability to represent unique DFIDs for unicast PQoS flows is limited
Solution Approach 1:
The DFID information is segmented and distributed across multiple existing fields in the RRE. The PRIORITY field carries the primary DFID information, while additional DFID bits are placed in the TOTAL_SIZE field's reserved bits. This segmentation allows DFID information to be embedded within the existing RRE structure without requiring a single dedicated DFID field, thereby maintaining the original RRE size and data transmission efficiency while still providing complete DFID representation capability.
Data Source
AI summary
Methods and apparatus for communicating unicast PQoS DFID information in a MoCA network are disclosed. In a transmitting apparatus, values are assigned in a first set of fields of a reservation request element, the first set adapted to indicate a unicast PQoS flow with a DFID value. Values are assigned in a second set of fields of the reservation request element, the second set adapted to represent the DFID value. A message comprising the reservation request element is transmitted to a network coordinator. In a receiving network coordinator, a message comprising a reservation request element is received, the reservation request element comprising a first set of fields and a second set of fields. It is determined whether the first set is indicative of a unicast PQoS flow with a DFID value. The DFID value is determined from the second set if the first set is indicative of a unicast PQoS flow with a DFID value.