Patent ID: 8121538
Filing Date: 2012-02-21
Classification: H04B,H04W

Abstract:
1. A communication system for use in a wireless network, the communication system having a service path and comprising: a base station (BS); a plurality of relay stations (RSs), one of the RSs being located within a coverage of the BS; and a mobile station (MS) being located within a coverage of one of the RSs; wherein the BS, the RSs, and the MS have a downlink relay sequence from the BS to the MS and are configured to build the service path via handshaking according to a plurality of control signals, each of the control signals has an authentication code adopted to be authenticated completeness of the corresponding control signal: wherein one of the control signals is a first BS request signal, the authentication code of the first BS request signal comprises an RS authentication code and an MS authentication code, the BS is further configured to generate the first BS request signal and transmit the first BS request signal to the next RS following the downlink relay sequence, each of the RSs is further configured to receive the first BS request signal and to authenticate completeness of the first BS request signal according to the RS authentication code, the last RS in the downlink relay sequence is configured to remove the RS authentication code from the first BS request signal, generate a second BS request signal comprising the MS authentication code, and transmit the second BS request signal to the MS, wherein the second BS request signal is one of the control signals, and the MS is further configured to receive the second BS request signal from the last RS in the downlinks relay sequence, and authenticate completeness of the second BS request signal according to the MS authentication code.