CPC H04W 16/02 (2013.01) [H04L 5/0005 (2013.01); H04L 27/32 (2013.01); H04W 72/0446 (2013.01); H04W 74/0833 (2013.01); H04W 84/18 (2013.01)] | 9 Claims |
1. A time-frequency division multiple access (TFDMA) random self-organizing ad hoc network construction method, comprising:
dividing spectrum resources of full frequency domain and full time domain resources in 24 hours a day occupied by a network system, wherein first, the divided frequency domain and time domain units are constructed into a period-frequency slot epoch-ring net, and then N period-frequency slot epoch-ring nets are stacked into a cylindrical web according to a time slot alignment principle, and finally U cylindrical webs are formed into the time-frequency division multiple access random self-organizing ad hoc network that covers the full frequency domain and the full time domain, the specific steps of network construction are as follows:
the full frequency domain resources are a total frequency spectrum allocated to the TFDMA ad hoc network, W is set to represent a bandwidth of the total frequency spectrum, and the total frequency spectrum of the network system with bandwidth W is divided into N sub-channels, Δf is set to represent a bandwidth of each sub-channel, Δf=fi−fi-1, i=1, 2, . . . , N, then, the TFDMA ad hoc network comprises N hopping points fi or N sub-channels center frequency fci=fc+i·Δf, N=W/Δf, wherein Δf is called a frequency slot or a frequency chip, and a first center frequency is fc=f0=fc0;
the full-time domain resources in 24 hours a day is divided as follows, 24 hours are divided into U epochs, each epoch determines one cylindrical web, thereby determining the minimum loop time of one TFDMA ad hoc network; one epoch is divided into V time frames, each of the time frames is a basic time unit of a time division multiple access mode, one time frame is divided into S time slots, and each of the time slots is a basic time unit of the TFDMA ad hoc network which one user terminal can assess, one time slot is divided into E time chips, each of the time chips is time occupied by a pulse symbol packet with a definite or adjustable duty cycle, which is also a duration of a symbol in a codeword in a permutation group code,
the period-frequency slot epoch-ring net, referred to as an epoch-ring net or a subnet, is determined by a period of the U epochs combined with a frequency slot Δf, specifically, a last time slot of V·S time slots in an epoch is connected to a first time slot to form a period-frequency slot epoch-ring net formed by the V·S time slots and the frequency slot Δf, which is also called a time slot-frequency slot epoch-ring net, or epoch-ring net for short, the network system comprises a total of N epoch-ring nets that can operate independently, each epoch-ring net is allocated a determined frequency hopping point or a center frequency of a sub-channel;
the cylindrical web is formed by stacking the N independently operable epoch-ring nets into a cylindrical web in a manner that time slots are aligned; when each corresponding time slot of the N epoch-ring nets is aligned, the web contains V·S time slices, and each of the time slices is composed of a time slot and N frequency slots;
the TFDMA ad hoc network is composed of U cylindrical webs, that is, one web is repeatedly used for U times, thereby forming a time-frequency division multiple access self-organizing network covering the full frequency domain and the full time domain.
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