# US 9,883,482 B2 · Signaling of core network restart to wireless devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,883,482 B2 - Document ID: US9883482B2 - Status: Granted - Kind: B2 - Application number: 15/060,214 - Filed: 2016-03-03 - Published: 2016-09-08 - Granted: 2018-01-30 - Earliest claimed: 2015-03-05 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget Lm Ericsson (Publ) - Inventors: Nicklas Johansson; John Walter Diachina; Mårten Sundberg; Olof Liberg; Paul Schliwa-Bertling - Web page: https://patentgrep.com/patent/US9883482B2 ## CPC - H04W 68/02: Arrangements for increasing efficiency of notification or paging channel - H04L 41/0654: using network fault recovery (ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437) - H04L 41/0661: {by reconfiguring faulty entities} - H04W 24/04: Arrangements for maintaining operational condition - H04W 52/0274: {by switching on or off the equipment or parts thereof} - H04W 76/19: Connection re-establishment - H04W 8/30: Network data restoration; {Network data reliability; Network data fault tolerance} - H04W 60/04: using triggered events - H04W 68/00: User notification, e.g. alerting and paging, for incoming communication, change of service or the like - Y02B 70/30: Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A radio access network node and methods are described herein for signaling an indication of a network restart to wireless devices within a cellular network. In one embodiment, the radio access network node is operable to: (1) signal, to the wireless devices, an indication that a network restart has occurred in a core network node in a pool of core network nodes in the cellular network; and (2) receive, from at least one of the wireless devices, a re-registration message in response to the signaling of the indication that the network restart has occurred. The wireless device and methods implemented by the same are also described herein. ## Claims ### Claim 1 A radio access network node configured to interact with a plurality of wireless devices, the radio access network node comprising: a processor; and, a memory that stores processor-executable instructions, wherein the processor interfaces with the memory to execute the processor-executable instructions, whereby the radio access network node is operable to: determine that a network restart has occurred in a core network node in a pool of core network nodes; signal, to the wireless devices, an indication that the network restart has occurred, wherein the signal operation further comprises: transmit, to the wireless devices, Extended Coverage Synchronization Channel (EC-SCH) content where one or more of six spare bits therein are used to indicate that the network restart has occurred; and receive, from at least one of the wireless devices, a re-registration message in response to the signaling of the indication that the network restart has occurred. ### Claim 2 (depends on 1) The radio access network node of claim 1, wherein the indication further identifies at least one of the following: the core network node in which the network restart has occurred; a longest used paging cycle in a cell to indicate to the wireless devices that a re-registration is not required every time that an indication that a network restart has occurred is signaled during a time period spanned by the longest used paging cycle; and a System Information (SI) version or a SI vintage counter. ### Claim 3 (depends on 1) The radio access network node of claim 1, wherein the radio access network node is operable to signal the indication by mapping a message including the indication onto a channel, which each of the wireless devices periodically wakes up to monitor prior to attempting to receive a paging message. ### Claim 4 (depends on 1) The radio access network node of claim 1, wherein the radio access network node is operable to signal the indication by mapping a message including the indication onto a channel, which is periodically monitored by each of the wireless devices while in idle mode. ### Claim 5 (depends on 1) The radio access network node of claim 1, wherein the radio access network node is operable to signal the indication by ‘in-band’ signaling that includes signaling the indication in conjunction with a transfer of a message without changing a content of the message. ### Claim 6 (depends on 5) The radio access network node of claim 5, wherein the ‘in-band’ signaling includes overlaying at least one channel which is periodically monitored by each of the wireless devices with a supplemental information channel that signals the indication by (1) using a different modulation symbol rotation or modulation index, or (2) using a bit-wise modulo 2 operation with a known bit pattern. ### Claim 7 (depends on 1) The radio access network node of claim 1, wherein the signal operation further comprises: transmit, to the wireless devices, one or more System Information (SI) messages to identify the core network node that has restarted. ### Claim 8 A method in a radio access network node configured to interact with a plurality of wireless devices, the method comprising: determining that a network restart has occurred in a core network node in a pool of core network nodes; signaling, to the wireless devices, an indication that the network restart has occurred, wherein the signaling step further comprises: transmitting, to the wireless devices, Extended Coverage Synchronization Channel (EC-SCH) content where one or more of six spare bits therein are used to indicate that the network restart has occurred; and receiving, from at least one of the wireless devices, a re-registration message in response to the signaling of the indication that the network restart has occurred. ### Claim 9 (depends on 8) The method of claim 8, wherein the indication further identifies at least one of the following: the core network node in which the network restart has occurred; a longest used paging cycle in a cell to indicate to the wireless devices that a re-registration is not required every time that an indication that a network restart has occurred is signaled during a time period spanned by the longest used paging cycle; and a System Information (SI) version or a SI vintage counter. ### Claim 10 (depends on 8) The method of claim 8, wherein the signaling step further comprises mapping a message including the indication onto a channel, which each of the wireless devices periodically wakes up to monitor prior to attempting to receive a paging message. ### Claim 11 (depends on 8) The method of claim 8, wherein the signaling step further comprises mapping a message including the indication onto a channel, which is periodically monitored by each of the wireless devices while in idle mode. ### Claim 12 (depends on 8) The method of claim 8, wherein the signaling step further comprises ‘in-band’ signaling that includes signaling the indication in conjunction with a transfer of a message without changing a content of the message. ### Claim 13 (depends on 12) The method of claim 12, wherein the ‘in-band’ signaling includes overlaying at least one channel which is periodically monitored by each of the wireless devices with a supplemental information channel that signals the indication by (1) using a different modulation symbol rotation or modulation index, or (2) using a bit-wise modulo 2 operation with a known bit pattern. ### Claim 14 (depends on 8) The method of claim 8, wherein the signaling step further comprises: transmitting, to the wireless devices, one or more System Information (SI) messages to identify the core network node that has restarted. ### Claim 15 A wireless device configured to interact with a radio access network node, the wireless device comprising: a processor; and, a memory that stores processor-executable instructions, wherein the processor interfaces with the memory to execute the processor-executable instructions, whereby the wireless device is operable to: receive, from the radio access network node, an indication that a network restart has occurred in a core network node in a pool of core network nodes, wherein the receive operation further comprises: receive, from the radio access network node, Extended Coverage Synchronization Channel (EC-SCH) content where one or more of six spare bits therein are used to indicate that the network restart has occurred; and determine that the network restart has occurred; and transmit, to the radio access network node, a re-registration message in response to the determination that the network restart has occurred. ### Claim 16 (depends on 15) The wireless device of claim 15, wherein the indication further identifies at least one of the following: the core network node in which the network restart has occurred; a longest used paging cycle in a cell to indicate to the wireless device that a re-registration is not required every time that an indication that a network restart has occurred is signaled during a time period spanned by the longest used paging cycle; and a System Information (SI) version or a SI vintage counter. ### Claim 17 (depends on 15) The wireless device of claim 15, wherein the wireless device is operable to receive the indication included in a message mapped onto a channel, which the wireless device periodically wakes up to monitor prior to attempting to receive a paging message. ### Claim 18 (depends on 15) The wireless device of claim 15, wherein the wireless device is operable to receive the indication included in a message mapped onto a channel, which is periodically monitored by the wireless device while in idle mode. ### Claim 19 (depends on 15) The wireless device of claim 15, wherein the wireless device is operable to receive the indication via ‘in-band’ signaling which includes receiving the indication in conjunction with receiving a message where a content of the message does not include the indication. ### Claim 20 (depends on 19) The wireless device of claim 19, wherein the wireless device is operable to obtain the indication from a supplemental information channel that overlays at least one channel periodically monitored by the wireless device, wherein the supplemental information channel signals the indication by (1) using a different modulation symbol rotation or modulation index, or (2) using a bit-wise modulo 2 operation with a known bit pattern. ### Claim 21 (depends on 15) The wireless device of claim 15, wherein the receive operation further comprises: receive, from the radio access network node, one or more System Information (SI) messages to identify the core network node that has restarted. ### Claim 22 A method in a wireless device configured to interact with a radio access network node, the method comprising: receiving, from the radio access network node, an indication that a network restart has occurred in a core network node in a pool of core network nodes, wherein the receiving step further comprises: receiving, from the radio access network node, Extended Coverage Synchronization Channel (EC-SCH) content where one or more of six spare bits therein are used to indicate that the network restart has occurred; and determining that the network restart has occurred; and transmitting, to the radio access network node, a re-registration message in response to the determination that the network restart has occurred. ### Claim 23 (depends on 22) The method of claim 22, wherein the indication further identifies at least one of the following: the core network node in which the network restart has occurred; a longest used paging cycle in a cell to indicate to the wireless device that a re-registration is not required every time that an indication that a network restart has occurred is signaled during a time period spanned by the longest used paging cycle; and a System Information (SI) version or a SI vintage counter. ### Claim 24 (depends on 22) The method of claim 22, wherein the receiving step further comprises receiving the indication included in a message mapped onto a channel, which the wireless device periodically wakes up to monitor prior to attempting to receive a paging message. ### Claim 25 (depends on 22) The method of claim 22, wherein the receiving step further comprises receiving the indication included in a message mapped onto a channel, which is periodically monitored by the wireless device while in idle mode. ### Claim 26 (depends on 22) The method of claim 22, wherein the receiving step further comprises receiving the indication via ‘in-band’ signaling which includes receiving the indication in conjunction with receiving a message where a content of the message does not include the indication. ### Claim 27 (depends on 26) The method of claim 26, wherein the wireless device obtains the indication from a supplemental information channel that overlays at least one channel periodically monitored by the wireless device, wherein the supplemental information channel signals the indication by (1) using a different modulation symbol rotation or modulation index, or (2) using a bit-wise modulo 2 operation with a known bit pattern. ### Claim 28 (depends on 22) The method of claim 22, wherein the receiving step further comprises: receiving, from the radio access network node, one or more System Information (SI) messages to identify the core network node that has restarted.