Compressed Signal Field Encoding for OFDMA Sub-Channel Allocation
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Solution Overview
Problem
The communication of sub-channel allocation information in OFDMA wireless networks increases overhead, reducing user data capacity and increasing processing and power consumption for receiving stations.
Innovation Solution
A method involving a generator function, such as a Cyclic Redundancy Check (CRC) generator, is used to generate a checksum and combine it with an address field, creating a compressed field like the High Efficiency Signal B (HE-SIGB) field, which includes information mapping sub-channels to receiving devices, reducing the need for stations to decode unnecessary sub-channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sub-channel allocation information is communicated in the Signal field of OFDMA frames, then stations can identify their allocated sub-channels, but overhead increases reducing user data capacity
Solution Approach 1:
The patent combines the address field and CRC field into a single compressed field by performing a bitwise XOR operation between the address bits and CRC bits. This merging reduces the total number of bits required for signaling, thereby decreasing overhead and increasing user data capacity while maintaining the ability to identify allocated sub-channels accurately.
Solution Approach 2:
The patent changes the representation parameters of the signal field by encoding the address and CRC information in a compressed format. Instead of transmitting separate address and CRC fields, the system transforms them into a compressed field with fewer bits, changing the parameter of information density while preserving the functional ability to identify sub-channel allocations.
2Reliability
If sub-channel allocation information is communicated in the Signal field, then stations receive allocation details, but processing resources and power consumption increase
Solution Approach 1:
By merging the address and CRC fields into a compressed field, the patent reduces the total number of bits that receiving stations must process. This compression directly reduces processing resources and power consumption while maintaining reliable delivery of allocation information through the preserved CRC verification capability.
3Reliability
If separate address and CRC fields are used in the Signal field, then error detection is reliable, but field complexity increases
Solution Approach 1:
The patent merges separate address and CRC fields into a single compressed field using bitwise XOR operations. This reduces signal field structure complexity while maintaining error detection capability, as the CRC portion of the compressed field can still be used to verify data integrity.
Solution Approach 2:
The compressed field acts as an intermediary that combines multiple functions (addressing and error detection) into a single structure. This intermediary representation simplifies the overall signal field structure while preserving the essential functions of both the address field and CRC field through the XOR combination.
Data Source
AI summary
A method for generating a compressed field addressed to a receiving device comprises generating, using a generator function, a checksum of a field. The field includes an address field and a remaining portion. The method further comprises generating a combined field by combining the checksum with the address field, and generating a compressed field including the combined field and the remaining portion. A method for determining whether the compressed field is addressed to the receiving device comprises receiving the compressed field and determining, using the combined field of the compressed field, an address of the receiving device, and the generator function, whether the compressed field is addressed to the receiving device.