Radio access out of service recovery

Patent metadata

Field	Value
Publication number	US-2018084487-A1
Application number	US-201615270560-A
Country	US
Kind code	A1
Filing date	Sep 20, 2016
Priority date	Sep 20, 2016
Publication date	Mar 22, 2018
Grant date	—

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may search for a first network associated with a first radio access technology (RAT) during a first time period in a RAT search cycle. The UE may search, when service is not acquired, for a second network associated with a second RAT during a second time period in the RAT search cycle. The UE may identify a radio frequency (RF) spectrum overlap in which a first RF band associated with the first RAT overlaps with a second RF band associated with the second RAT. When service is not acquired with respect to the second RAT, the UE may scan for RF energy corresponding to the second RF band of the second RAT. Then, the UE may determine whether to perform a subsequent search for the first network in the first RF band of the first RAT.

First claim

What is claimed is:

1 . A method for wireless communication, comprising:
searching for a first network associated with a first radio access technology (RAT) during a first time period in a RAT search cycle; searching, when service is not acquired with respect to the first RAT, for a second network associated with a second RAT during a second time period in the RAT search cycle; identifying a radio frequency (RF) spectrum overlap in which a first RF band associated with the first RAT overlaps with a second RF band associated with the second RAT; scanning, when service is not acquired with respect to the second RAT, for RF energy corresponding to the second RF band of the second RAT; and determining, based at least in part on the scanning, whether to perform a subsequent search for the first network in the first RF band of the first RAT.

2 . The method of claim 1 , further comprising:
performing the subsequent search for the first network when the RF energy satisfies a threshold for operable communications associated with the first RAT.

3 . The method of claim 1 , further comprising:
setting, based at least in part on scanning for RF energy, a first RAT suspect indicator; and sending the first RAT suspect indicator to a non-access stratum layer entity.

4 . The method of claim 3 , further comprising:
setting, based at least in part on scanning for RF energy, a RAT search continuity parameter to identify the second RAT for further searching of one or more additional RF bands associated with the second RAT if service is not acquired with respect to the first RAT based at least in part on the subsequent search; and performing, based at least in part on the first RAT suspect indicator, the subsequent search for the first network.

5 . The method of claim 3 , further comprising:
setting, based at least in part on scanning for RF energy, a RAT search continuity parameter to identify a third RAT for further searching if service is not acquired with respect to the first RAT based at least in part on the subsequent search; and performing, based at least in part on the first RAT suspect indicator, the subsequent search for the first network.

6 . The method of claim 1 , further comprising:
sending, when service is not acquired with respect to the first RAT, first network camped history information to a non-access stratum entity; and determining, prior to identifying the RF spectrum overlap, that the first RF band associated with the first RAT is included in the first network camped history information.

7 . The method of claim 1 , further comprising:
setting, based at least in part on the identifying the RF spectrum overlap, an RF spectrum overlap indicator; and sending, based at least in part on the RF spectrum overlap, network information associated with the first RAT to a radio resource entity associated with the second RAT.

8 . The method of claim 7 , further comprising:
sending network information associated with the first RAT comprises sending, by a non-access stratum layer entity, network information including the first RF band and at least one evolved universal terrestrial radio access (E-UTRA) absolute RF channel number (EARFCN) to the radio resource entity associated with the second RAT.

9 . The method of claim 7 , further comprising:
mapping, by the radio resource entity associated with the second RAT, the network information associated with the first RAT to the second RF band and at least one universal terrestrial radio access (UTRA) absolute RF channel number (UARFCN).

10 . The method of claim 9 , wherein
the scanning for RF energy corresponding to the second RF band comprises scanning, based at least in part on the mapping, for RF energy corresponding to the second RF band of the second RAT.

11 . The method of claim 1 , wherein
the RAT search cycle includes a sequential order of RATs to be searched that includes at least one of searching the first RAT during the first time period, searching the second RAT during the second time period, or searching a third RAT during a third time period.

12 . The method of claim 11 , wherein
the second RAT is different from the first RAT and the third RAT is different from the first RAT and the second RAT.

13 . The method of claim 1 , wherein
the subsequent search for the first network comprises a long term evolution (LTE) acquisition database scan.

14 . The method of claim 1 , further comprising:
acquiring service with respect to the first RAT based at least in part on the subsequent search, without searching for a third network associated with a third RAT during a third time period in the RAT search cycle.

15 . An apparatus for wireless communication, in a system comprising:
a processor; memory in electronic communication with the processor; and one or more instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: search for a first network associated with a first radio access technology (RAT) during a first time period in a RAT search cycle; search, when service is not acquired with respect to the first RAT, for a second network associated with a second RAT during a second time period in the RAT search cycle; identify a radio frequency (RF) spectrum overlap in which a first RF band associated with the first RAT overlaps with a second RF band associated with the second RAT; scan, when service is not acquired with respect to the second RAT, for RF energy corresponding to the second RF band of the second RAT; and determine, based at least in part on the scanning, whether to perform a subsequent search for the first network in the first RF band of the first RAT.

16 . The apparatus of claim 15 , wherein the one or more instructions are further executable by the processor to:
perform the subsequent search for the first network when the RF energy satisfies a threshold for operable communications associated with the first RAT.

17 . The apparatus of claim 15 , wherein the one or more instructions are further executable by the processor to:
set, based at least in part on scanning for RF energy, a first RAT suspect indicator; and send the first RAT suspect indicator to a non-access stratum layer entity.

18 . The apparatus of claim 17 , wherein the one or more instructions are further executable by the processor to:
set, based at least in part on scanning for RF energy, a RAT search continuity parameter to identify the second RAT or a third RAT for further searching of one or more additional RF bands associated with the second RAT or the third RAT if service is not acquired with respect to the first RAT based at least in part on the subsequent search; and perform, based at least in part on the first RAT suspect indicator, the subsequent search for the first network.

19 . The apparatus of claim 15 , wherein the one or more instructions are further executable by the processor to:
acquire service with respect to the first RAT based at least in part on the subsequent search, without searching for a third network associated with a third RAT during a third time period in the RAT search cycle.

20 . A non-transitory computer readable medium storing code for wireless communication, the code comprising one or more instructions executable by a processor to:
search for a first network associated with a first radio access technology (RAT) during a first time period in a RAT search cycle; search, when service is not acquired with respect to the first RAT,

Assignees

• Qualcomm Inc

Inventors

• Arumugam Bhaskaran
• Ananda Manjunatha Subbamma
• Palanisamy Santhana
• Ladhagiri Krishnakumar Sai Lokesh

Classifications

• H04W48/16 Primary

  Discovering, processing access restriction or access information · CPC title

• H04W48/17

  Selecting a data network PoA [Point of Attachment] · CPC title