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A key update method and device

A key update and key technology, applied in security devices, secure communication devices, digital transmission systems, etc., can solve problems such as business impact

Inactive Publication Date: 2011-12-14
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] During the communication process, when the count value of the counter at the PDCP layer reaches the threshold value, the eNB initiates the intra-cell handover process of the RN, causing the RN to generate an interruption delay, thereby affecting the services of all UEs under the RN in the cell

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Embodiment Construction

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The network nodes in the present invention can be eNBs and relay nodes, and the following network nodes are respectively referred to as RN or eNB For explanation, it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] figure 1 It is a schematic flow chart of an embodiment of a key update method in the present invention. When the count value of the counter in the packet data convergence protocol PDCP layer of a radio bearer RB reaches a threshold value, it includes: ...

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Abstract

A method for refreshing a key is provided by the present invention, wherein when a counter in a Packet Data Convergence Protocol PDCP layer of a Radio Bearer RB reaches a threshold, a mobile device receives a cell handover message, re-establishes PDCP layers and Radio Link Control RLC layers for all RBs, keeps Uplink Time Alignment Information, uplink grant resources for uplink shared channel and Physical Uplink Control Channel resources allocated semi-statically, and flushes a buffer of a Medium Access Control MAC layer; the mobile device obtains a new root key, and obtains a new encryption and integrity protection key of a radio resource control plane according to the new root key; the mobile device transmits a cell handover complete message protected by the new encryption and integrity protection key. Thereby, a random access process initiated by the mobile device is avoided and interruption delay caused by the random access initiated by the mobile device is thus avoided. A mobile device and a network node are also provided by the present invention.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a key update method and device. Background technique [0002] At the edge of cell coverage in the mobile communication system, due to wireless network coverage problems, users experience poor experience. In order to achieve high-speed wireless network coverage and improve cell edge throughput, a relay station (Relay Node, RN) is introduced. The relay station is connected to the base station (eNB) through a wireless link, the interface between the relay station and the base station is called an Un interface, and the interface between the relay station and a user equipment (UE) under its cell is called a Uu interface. [0003] A data radio bearer (Data Radio Bearer, DRB) of the RN will serve multiple terminals (User Equipment, UE) with the same or similar service characteristics, so the packet data convergence protocol (Packet Data Convergence Protocol, PDCP) layer of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W12/04H04W36/08H04W12/0433H04W12/10
CPCH04W36/06H04W12/04H04L9/0827H04L2209/80H04W80/02H04L9/0891H04W36/0038H04W36/00
Inventor 柴丽
Owner HUAWEI TECH CO LTD