US 11,457,498 B2Granted

Handling of PDCP during connection re-establishment

AssigneeTelefonaktiebolaget LM Ericsson (publ)

InventorsOumer Teyeb, Gunnar Mildh

Life of this patent

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Abstract

Systems and methods are disclosed for a host providing an over-the-top service. An example host includes processing circuitry to provide user data associated with the service and a network interface to initiate transmission of the user data from a network node in a cellular network. The network node is configured to provide a Radio Resource Control connection re-establishment message to a user equipment (UE) previously connected to the RAN via Signaling Radio Bearer 1 (SRB1). SRB1 is configured with a New Radio Packet Data Convergence Protocol (PDCP) configuration. After the UE receives the RRC connection re-establishment message, the UE derives security keys. The network node is further configured to re-establish the UE's connection to the RAN, by applying a Long-Term Evolution (LTE) PDCP configuration to SRB1 and applying ciphering using the plurality of derived security keys, and to transmit the user data over the re-established connection.

Claims12

Dependent claims

A host configured to operate in a communication system to provide an over-the-top (OTT) service, the host comprising:

processing circuitry configured to provide user data associated with the OTT service;
and
a network interface configured to initiate transmission of the user data from a network node in a cellular network, the network node having a communication interface and processing circuitry, the processing circuitry of the network node configured to perform operations comprising:
providing a Radio Resource Control (RRC) connection re-establishment message to a user equipment (UE) that was previously connected to a Radio Access Network (RAN) via Signaling Radio Bearer 1 (SRB1),
wherein the connection re-establishment message includes a radioResourceConfigDedicated information element (IE),
wherein SRB1 is configured with a New Radio (NR) Packet Data Convergence Protocol (PDCP) configuration, and
wherein after the UE receives the RRC connection re-establishment message, the UE derives a plurality of security keys;
re-establishing the UE's connection to the RAN, the re-establishing including applying a Long-Term Evolution (LTE) PDCP configuration to SRB1 and applying ciphering using the plurality of derived security keys;
mapping at least one of an NR encryption algorithm or an NR integrity protection algorithm to a pre-defined LTE algorithm;
and
transmitting the user data over the re-established connection.

8 more elements

A method implemented in a host configured to operate in a communication system that further includes a network node and a user equipment (UE) to provide an over-the-top (OTT) service, the method comprising:

providing user data for the UE;
and
initiating a transmission carrying the user data to the UE via a cellular network comprising the network node, wherein the network node performs operations comprising:
providing a Radio Resource Control (RRC) connection re-establishment message to a user equipment (UE) that was previously connected to a Radio Access Network (RAN) via Signaling Radio Bearer 1 (SRB1), wherein the connection re-establishment message includes a radioResourceConfigDedicated information element (IE), wherein SRB1 is configured with a New Radio (NR) Packet Data Convergence Protocol (PDCP) configuration, and wherein after the UE receives the RRC connection re-establishment message, the UE derives a plurality of security keys including an RRC message integrity protection key (KRRCint), an RRC message encryption key (KRRCenc), and a user plane encryption key (KUPenc):
re-establishing the UE's connection to the RAN, the re-establishing including applying a Long-Term Evolution (LTE) PDCP configuration to SRB1 and applying ciphering using the plurality of derived security keys;
mapping at least one of an NR encryption algorithm or an NR integrity protection algorithm to a pre-defined LTE algorithm;
and
transmitting the user data over the re-established connection.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/543,260Filed 6 Dec 2021 · continuation
Priority: 15 Nov 2017
Published: US 2022/0095405 A124 Mar 2022
Granted: 27 Sep 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04W 76/15
Connection setup: setup of multiple wireless link connections
H04W 76/19
Connection setup: connection re-establishment
H04W 12/10
Security arrangements; Authentication; Protecting privacy or anonymity: integrity
H04W 76/10
Connection management: connection setup

Family

Application62/586,348Us provisional application · filed 15 Nov 2017
PCT/IB2018/058341Parent of this continuation · filed 25 Oct 2018
Application17/349,013Parent of this continuation · filed 16 Jun 2021
US 11,051,354 B2Parent of this continuation · filed 29 Jun 2021
US 2022/0095405 A1Pre-grant publication · published 24 Mar 2022
Application16/331,633Parent of this continuation
US 11,737,160 B2Related patent
US 2020/0229259 A1Published application
US 2021/0345436 A1Published application
US 11,457,498 B2This patent

From the US filing history. Foreign family members aren’t listed.