Patent ID: 9137785
Filing Date: 2015-09-15
Classification: H04W

Abstract:
1. A method in a first mobile terminal of determining allocation of radio resources for communicating amongst a group of mobile terminals in direct mode operation (DMO), the radio resources being generally divided into resource elements in different time slots of a radio frame structure, the method comprising: determining a communication with a second mobile terminal of the group, determining a resource element for communicating data with the second mobile terminal by applying a predefined cryptographic function P based on a terminal identification, the cryptographic function P being configured in the mobile terminals of said group to provide terminal-specific resource elements for different ones of the mobile terminals within respective radio frames, and determining whether said resource element for communicating is used in a current radio frame by a third mobile terminal of said group, and if so, determining a new resource element for transmission in a subsequent radio frame by applying the cryptographic function P based on a first alias for said terminal identification; communicating said data to the second mobile terminal using said resource element, wherein said terminal identification is an identifier of the first mobile terminal.