Method and system for preventing collisions in contention based networks

摘要

The embodiments herein provide a method and system for preventing collisions in a contention based random access preambles in a communication network. The method comprises of dividing the contention based preambles into a plurality of sub-groups, categorizing a plurality of users into a plurality of sub-groups, scheduling the users within a preamble subgroup in one or more random access channel opportunities and transmitting information on the sub-groups of the preamble and the random access channel opportunities to one or more user equipments. The users within a sub-group are provided access to the set of contention based preambles dispersed in time thereby reducing the number of user equipments colliding on a single random access preamble channel.

主权项

1. A method of preventing collisions in contention based random access preambles in a communication network, the method comprising the following steps:
dividing the contention based random access preambles into a plurality of sub-groups, and assigning at least one user equipment to each of the sub-groups; incorporating an information element into at least one of an RRC Connection Setup message and RRC Connection Reconfiguration message, said information element indicating the random access preambles a user equipment is allowed to use for accessing a random access channel (RACH), and next available RACH opportunity for the user equipment; selectively modifying said information element to disperse available RACH opportunities across a time domain; scheduling the user equipment within each of the plurality of sub-groups, in one or more random access channel opportunity, based on said information element; and transmitting information on the sub-groups and the random access channel opportunity to the user equipments; wherein the user equipments within a sub-group are provided access to the set of contention based random access preambles dispersed in time, thereby reducing the number of user equipments colliding on a single random access preamble channel.