Random access method and apparatus based on analog network coding for two-way relay channel
AssigneeAjou University Industry-Academic Cooperation Foundation
InventorsJae Sung Lim, Hong Jun Noh, Kyu Man Lee
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Abstract
The present invention generally relates to a random access method and apparatus based on analog network coding for a satellite network and, more particularly, to technology that combines analog network coding with random access, thus guaranteeing high channel usage efficiency upon utilizing the technology for a satellite positioning/communications convergence system. For this, a random access apparatus based on analog network coding for a satellite network according to an embodiment of the present invention includes a received signal determination unit, a data packet transmission unit, a reserved slot decision unit, a response message reception unit, and a data packet decoding unit.
Claims16
A random access method based on analog network coding, comprising:
- receiving, by a first terminal station, a communication channel for one frame period of a communication network and determining a status of occupation of each slot;
- selecting, by the first terminal station, an empty slot as a first slot, and transmitting a first data packet for analog network coding hi the selected first slot over the communication network;
- receiving, by the first terminal station, data in the first slot in which the first data packet is transmitted, and determining whether a collision has occurred between the transmitted first data packet and any additional data packet in the first slot;
- deciding on, by the first terminal station, the first slot as a reserved slot if a collision has not occurred in the first slot and the first slot as not a reserved slot if a collision has occurred hi the first slot;
- and
- transmitting, by the first terminal station, a second data packet for analog network coding in the first slot, decided on as the reserved slot, over the communication network,
- wherein the second data packet includes a sequence code allowing terminal stations other than the first terminal station and a second terminal station, which is a counterpart of communication based on analog network coding, wherein the first slot is a specific slot randomly accessed by the first terminal station and a reserved slot for communication based on analog network coding.
A random access apparatus based on analog network coding, comprising a processor and a memory that is coupled with the processor and to store instructions executed in the processor, the processor configured to:
- receive a communication channel for one frame period of a communication network and determining a status of occupation of each slot for a first terminal station;
- select an empty slot as a first slot;
- and transmitting a first data packet for analog network coding in the selected first slot over the communication network for the first terminal station;
- and
- decide on the first slot as a reserved slot for the first terminal station if a collision has not occurred in the first slot and the first slot as not a reserved slot if a collision has occurred in the first slot,
- wherein the processor allows the first terminal station to receive data in the first slot, in which the first data packet is transmitted, and determines whether a collision has occurred between the transmitted first data packet and any additional data packet in the first slot,
- the processor is further configured to define a sequence code to be utilized as a preamble and a postamble of a second data packet for analog network coding in the first slot decided on as the reserved slot,
- wherein the processor allows the first terminal station to transmit the second data packet including the sequence code in the first slot over the communication network, the first slot is a specific slot randomly accessed by the first terminal station and a reserved slot for communication based on analog network coding.
Dependencies are inferred from the claim text.