Distributed Channel Access Using Multiple Access Signatures

The patent segments the frequency resource by introducing multiple orthogonal access signatures (e.g., different cyclic shifts of base sequences) that divide the single frequency resource into multiple distinguishable transmission channels. Each transmitting device is assigned a unique access signature, allowing simultaneous transmissions to be separated at the receiver side, thus maintaining high resource utilization while avoiding collisions.

The patent applies local quality by assigning different access signature characteristics (e.g., different cyclic shift values, different root sequences) to different transmitting devices operating on the same frequency resource. This creates locally distinguishable transmission qualities that enable the receiver to differentiate between multiple sources, resolving the contradiction between resource sharing and transmission reliability.

The patent implements MA signatures by changing specific parameters of existing sequences, such as cyclic shift values, root sequence indices, or orthogonal cover codes. These parameter changes create distinguishable access signatures without requiring fundamentally new signal structures, thus achieving reliable transmission differentiation with minimal increase in device complexity.

The patent makes the access signature mechanism universal by using the same basic sequence and signature generation methodology for both control information and data transmissions. The same orthogonal sequences and cyclic shift techniques apply across different transmission types, reducing the need for separate complex mechanisms and thereby limiting the increase in device complexity.