Patent ID: 9025568
Filing Date: 2015-05-05
Classification: H04W

Abstract:
1. A downlink orthogonal variable spreading factor (OVFS) code assignment method, for use in a code division communication system, the method comprising: a) in response to a service request, determining whether a spreading factor required by the service request is greater than a remaining capacity of assignable spreading factors of a code tree; b) when it is determined that the required spreading factor is smaller than the remaining capacity, searching the code tree from a root of the code tree until a node of the code tree in a layer corresponding to the required spreading factor is reached and thus defined as the first node; during the searching of the code tree: when a searched node of the code tree is in an unassigned state, the searching continues leftward in a lower layer of the code tree with respect to the searched node; and when the searched node is in an assigned state, the searching continues rightward in a same layer of the searched node; c) determining, from the first node, whether any assignable code is available in the layer corresponding to the required spreading factor; d) when the determination in step (c) is positive, assigning an available assignable code to a communication service corresponding to the service request; and e) when the determination in step (c) is negative, searching a layer that is k layer lower than the layer corresponding to the required spreading factor, from a layer for k=1 to a last layer of the code tree, until 2