Patent ID: 7889699

Claim:
A method for selecting a serving node by a Mobile Station (MS) to provide the MS with a service in a multi-hop wireless mobile communication system where a plurality of nodes exist, the method comprising the steps of: receiving from at least two nodes relay information; and calculating a time for unit data transmission/reception of each of the at least two nodes using the relay information, and selecting a node that requires a minimum time for the unit data transmission/reception as the serving node, based on the calculated time, when the multi-hop wireless communication system uses a variable time slot, wherein if the MS is directly connected with a first node of the at least two nodes and the first node has a base station and a relay node as upper nodes, a time for the unit data transmission/reception of the first node is calculated based on EST cell ⁢ ⁢ 1 = 1 BW cell ⁢ ⁢ 1 × log 2 ⁡ ( 1 + SINR cell ⁢ ⁢ 1 ) + 1 BW relay ⁢ ⁢ 1 × Rate relay ⁢ ⁢ 1 + 1 BW relay ⁢ ⁢ 2 × Rate relay ⁢ ⁢ 2 where an Estimated Service Time (EST) cell indicates the time for the unit transmission/reception of the first node, BW cell1 indicates a bandwidth that is used by the first node, BW relay1 indicates a bandwidth allocated to a first relay link between the base station and the relay node, BW relay2 indicates a bandwidth allocated to a second relay link between the relay node and the first node, Rate relay1 indicates a transmission rate per unit bandwidth (bps/Hz) at which data can be transmitted through the first relay link, Rate relay2 indicates a transmission rate per unit bandwidth at which data can be transmitted through the second relay link, SINR cell1 indicates a signal-to-interference noise ratio that is determined by measuring a strength of a pilot signal transmitted from the first node.