| 摘要 |
The present application relates generally to Device to Device (D2D) communication in a radio access network (RAN) and seeks to use orthogonal radio channels in a discovery process that precedes a possible D2D communication. The RAN defines 201 a period consisting of k time-frequency resource chunks, each providing n sending opportunities on the orthogonal radio channels. Preferably, each of these n sending opportunities is usable on a different orthogonal radio channel. The period defined by the RAN comprises altogether k x n sending opportunities when k > 1, n is integer, and n > 2. Then, the RAN allocates 202 a first portion of the k x n sending opportunities to a first UE. The first UE needs at least one sending opportunity included in the first portion to send a discovery message in the discovery process. There may be a great number of simultaneous discovery processes, but the radio resources can be divided in a very flexible way between the discovery processes and other possible functions. |
