Patent ID: 9307559
Filing Date: 2016-04-05
CPC Classification: H04L,H04W

Claim Text:
1. A mobile telecommunications system, comprising: a plurality of first mobile terminals that transmit uplink data to a network over a radio interface on a first group of sub-carriers of a plurality of sub-carriers over a first bandwidth, and transmit first random access request messages on a first random access channel to a base station of the network; and a plurality of second mobile terminals that transmit uplink data to the network over the radio interface on a second group of sub-carriers over a second bandwidth, and transmit second random access request messages on a second random access channel to the base station, wherein the first and second random access request messages request uplink radio resources, the second group of sub-carriers is within the first group of sub-carriers, the second bandwidth is smaller than the first bandwidth, the second random access channel is positioned on a sub-set of sub-carriers within and smaller than the second group of sub-carriers, the second group of sub-carriers forms a virtual carrier inserted within the first bandwidth and the remaining sub-carriers of the first group of sub-carriers form a host carrier, the first random access request messages include a first preamble, the second random access request messages include a second preamble different from the first preamble, the base station determines that a particular random access request message is from a first mobile terminal when the particular random access request message includes the first preamble, and the base station determines that the particular random access request message is from a second mobile terminal when the particular random access request message includes the second preamble.