Showing papers on "Channel allocation schemes published in 1978"

Capacity reallocation method and apparatus for a TDMA satellite communication network with demand assignment of channels

Abstract: In a time division multiple access communication system utilizing a satellite for communicating signals between a plurality of ground stations, at spaced times a reference ground station reallocates the total channel capacity of the system among the several ground stations to minimize system blocking and to thereby utilize the available system channel capacity more effectively. To increase the time between successive reallocations, channels are reallocated only when a ground station makes a channel capacity request that is greater than or equal to its corresponding present channel allocation. System blocking is minimized by using a table look-up scheme to generate excess capacity allocation factors for the stations and to thereby determine each station's proportionate share of excess system capacity. An appropriate portion of excess capacity is then added to each station's channel capacity request to provide a new channel allocation for each station. The new channel allocations are transmitted to appropriate ground stations and each station thereafter adjusts its burst duration to correspond to its new channel capacity allocation.

Multitransmitter digital signal transmission by using offset frequency strategy in a land-mobile telephone system

Abstract: In a high-capacity land-mobile telephone system which employs a small zone technique, it is advantageous to provide control channels separate from voice channels. We first review two control channel allocation methods: the individual control zone system and the multiple control zone system. From the viewpoints of efficient frequency utilization and reliable call processing, the multiple control zone system is shown to be preferable. It is experimently verified that an offset carrier frequency strategy is well suited to the realization of this system. Simulation test results are presented which determine the design parameters. Offset carrier frequency allocation methods concerning three types of fundamental zone configuration are derived. The carrier frequency synchronization and the phase adjustment of the modulation signals are investigated for the actual system construction.

Arrangement for conversion of random to fixed data channel format

Abstract: A private automatic branch exchange employing time division switching of digital signals, with provision for interfacing a fixed format data channel source to the randomly assigned channel allocation of the exchange. This is accomplished via channel buffering and channel address conversion under control of the branch exchange clock system.

Multiplex transmission connection system - is for several remote stations and allocates transmission channel in accordance with priority list

Abstract: A transmission channel is allocated to a first sending station. The channel is allocated to a second station which is ready to send as soon as the first station ceases to transmit and the channel becomes free. Allocation of the transmission channel to one of the stations is made by an entitlement allotter. This unit is used to allocate the transmission channel to one of the stations in accordance with a fixed priority list. Each station may have a counter system. The channel allocation system may be used with telephone networks.