Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1997-10-22
2000-03-14
Patel, Ajit
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370328, 370346, 370347, H04Q 700, H04J 316, H04B 7212
Patent
active
060382236
ABSTRACT:
A new access scheme for a digital radio network for providing packet data access to mobile stations operating within said network. A random access channel (ACH) is provided for control signaling and short data messages between the network and the mobile stations. One or more polling data channels (PDCHs) are provided for larger quantities of data to be sent between the mobile stations and the network. A mobile station seeking access to send data packets contacts the network over the ACH channel, registers for packet access and is assigned a unique flag pattern. The network then sequentially provides to various registered mobiles access to a PDCH channel by sending its flag pattern in a message over the downlink PDCH. When each mobile recognizes its own unique flag pattern it knows that it is then allowed to send a discrete number of packet bursts to the network over the uplink PDCH before access to the PDCH is given to another registered mobile station. This procedure provides shared access to the PDCH channel to each of the mobiles in the network and prevents collisions between the packets of different mobile stations.
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Frid Lars
Hansson Rolf
Herlitz Anders
Patel Ajit
Pizarro Ricardo M.
Telefonaktiebolaget LM Ericsson (publ)
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