Sometimes UE information does not mention something 'supported' but seems to work. Sometimes UE information says 'Supported' but in reality does not working correct. Note 1 : Take this as a guideline but don't trust too much. Followings are some of the RRC message and IEs you can get UE capability information. So I recommend you to check before troubleshoot (especially for radio stack issue). In some case, we spend pretty much time and effort to troubleshoot something which is not supported by UE. Try to get the high level understandings of UE capability information message and refer to following pages for the details. So I would split the message into a couple of categories as shown below and post separate pages for each of the categories. Since the message is too long and too complicated, it would be tricky to describe all of the contents in the single page.
But I would suggest you to understand at least on how to interprete the contents of the highlighted items. The more you know of the contents the more you can understand about the UE and the better position you are at for troubleshooting. Very high level view of UE Capability Information message structure is shown below. High Level Structure of UE Capability Information UE-CapabilityRequest ::= SEQUENCE (SIZE (1.maxRAT-Capabilities)) OF RAT-Type Refer to 36.331 5.6.3.3 Reception of the UECapabilityEnquiry by the UE in the latest spec if you want to know on the details of the information in the message. I want to show how this message has expanded as LTE evolves in following table. As a result, interpreting the contents of the message has become pretty complicated. When LTE first came out, this process was very simple, but as LTE evolves the information that are required gets larger and complicated. UE reports the information to NW as requested Network sends UECapabilityEnquiry and UE replied with UECapabilityInformation. The process is very simple as shown below. High Level Structure of UE Capability Informationįollowing is how UE Capability Enquiry works.Followings are list of topics that will be dealt with in this page or a few other pages that are related to UE capability Information. When I frist start writing this page around 2011, I didn't expect it to become such a complicated and long page, but as LTE evolves this part has gets longer and I think this part would grow even further as it start include 5G/NR features. As LTE release goes higher and more features are added, UE Capability Information has become the longest and most complicated Radio Message. It informs on all the details of its capabilities. UE Capability Information is an RRC message that UE sents to Network (in most case during initial registration process). LTE Quick Reference Go Back To Index Home : UE Capability Information
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