Patent ID: 9485752
Filing Date: 2016-11-01
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A communication device for use in a communication system, the communication device comprising: a plurality of antennas; a communication module operable to: communicate with at least one communication terminal using the antennas; and control a transmission directionality of the antennas based on a received previously known signal transmitted from a communication terminal, when transmitting a signal to the communication terminal; and a radio resource allocation module operable to: allocate a first upstream radio sub-resource, to be used for transmitting the received previously known signal, to a first communication terminal to which a downstream radio resource is to be allocated, a first upstream radio resource for a first previously known signal comprising the first upstream radio sub-resource; and allocate a second upstream radio sub-resource, to be used for transmitting the received previously known signal, to a second communication terminal to which a downstream radio resource is not to be allocated, a second upstream radio resource for a second previously known signal comprising the second upstream radio sub-resource, wherein the radio resource allocation module is further operable to change an upstream radio resource to be allocated to a third communication terminal from the first upstream radio sub-resource to the second upstream radio sub-resource, when an allocation of a downstream radio resource is cancelled with respect to the third communication terminal to which the first upstream radio resource has been allocated.