Patent ID: 6301479
Filing Date: 2001-10-09
Classification: H04L,H04W

Abstract:
A method for providing a secure link when transitioning from a first pair of link layer protocol entities to a second pair of link layer protocol entities in a mobile communication system, the first pair of link layer protocol entities including a first transmitting link layer protocol entity for segmenting data and transmitting segmented data and a first receiving link layer protocol entity for receiving segmented data from the first transmitting link layer protocol entity and acknowledging the received segmented data, the second pair of link layer protocol entities including a second transmitting link layer protocol entity for segmenting data and transmitting segmented data and a second receiving link layer protocol entity for receiving segmented data from the second transmitting link layer protocol entity and acknowledging the received segmented data, the method comprising the steps of:suspending data transmissions from the first transmitting link layer protocol entity to the first receiving link layer protocol entity;initiating data transmissions from the second transmitting link layer protocol entity to the second receiving link layer protocol entity; andtunneling unacknowledged segmented data in the first transmitting link layer protocol entity from the first transmitting link layer protocol entity to the first receiving link layer protocol entity through the second transmitting link layer protocol entity and the second receiving link layer protocol entity.