Sunday, September 28, 2014

CSA - Site Survey Method/LTE SIBtype1

CSA - Site Survey Method/LTE SIBtype1

Before continuing with GSM/GERAN System Information Message Types, thanks for the enquiries regarding LTE and requests for an example of a systeminformationblocktype(SIB). It would appear there is a requirement to explore LTE and UMTS SIBs some more before moving on to GSM/GERAN. I will do my best to answer some of the enquiries.

For educational purposes only, followingthe masterinformationblock(MIB) having been decoded by the UE a useful example of content for systeminformationblocktype1 was illustrated by Ralf Kreher and Karsten Gaenger (c)2011 using Tektronix K2Air as an example when conducting a LTE investigation into signalling troubleshooting and optimisation.

|ID Name |Comment or Value |
systemInformationBlockType1 |
|Tektronix K2Air LTE PHY Data Message Header (K2AIR-PHY) PDSCH (= PDSCH Message) |
|1 PDSCH Message |
|1.1 Common Message Header |
|Protocol Version |0 |
|Transport Channel Type |DL-SCH |
|Physical Channel Type |PDSCH |
|System Frame Number |454 |
|Direction |Downlink |
|Radio Mode |FDD |
|Internal use |0 |
|Status |Original data |
|Reserved |0 |
|Physical Cell ID |0 |
|Subframe Number |5 |
|UE ID/RNTI Value |'ffff'H |
|1.2 PDSCH Header |
|CRC report |CRC ok |
|HARQ process number |0 |
|Reserved |0 |
|Transport Block Indicator |single TB info |
|Reserved |0 |
|1.2.1 Transport Block#1 Information |
|Transport Block#1 Size |144 |
|Modulation Order DL 1 |QPSK |
|New Data Indicator DL 1 |new data |
|Redundancy Version DL 1 |1 |
|Reserved |0 |
|Modulation Scheme Index DL 1 |5 |
|Reserved |0 |
|1.2.2 Transport Block Data |
|TB1 Mac-PDU Data |40 51 00 21 00 00 20 00 10 0c 14 01 10
21 00 68 22 b6 |
|Padding |'0068'H |
|1.3 Additional Call related Info |
|Number Of Logical Channel Informations |1 |
|1.3.1 Logical Channel Information |
|LCID |0 |
|RLC Mode |Transparent Mode |
|Radio Bearer ID |0 |
|Radio Bearer Type |Control Plane (Signalling) |
|Spare |0 |
|Spare |0 |
|Logical Channel Type |BCCH |
|Call ID |'fffffff5'H |
|3GPP LTE-RLC/MAC Rel.8 (MAC TS 36.321 V8.5.0, 2009-03, RLC TS 36.322 V8.5.0, 2009-03) (LTE-RLC/
MAC) MAC-TM-PDU (DL) (= MAC PDU (Transparent Content Downlink)) |
|1 MAC PDU (Transparent Content Downlink) |
|MAC Transparent Data |40 51 00 21 00 00 20 00 10 0c 14 01 10
21 00 68 22 b6 |
|RRC (BCCH DL SCH) 3GPP TS 36.331 V8.5.0 (2009-03) (LTE-RRC_BCCH_DL_SCH)
systemInformationBlockType1 (= systemInformationBlockType1) |
|bCCH-DL-SCH-Message |
|1 message |
|1.1 Standard |
|1.1.1 systemInformationBlockType1 |
| cellAccessRelatedInfo |
| plmn-IdentityList |
| pLMN-IdentityInfo |
| plmn-Identity |
| mcc |
| mCC-MNC-Digit |2 |
| mCC-MNC-Digit |9 |
| mCC-MNC-Digit |9 |
| mnc |
| mCC-MNC-Digit |0 |
| mCC-MNC-Digit |0 |
| cellReservedForOperatorUse |notReserved |
| trackingAreaCode |'0000'H |
| cellIdentity |'2000100'H |
| cellBarred |notBarred |
| intraFreqReselection |notAllowed |
| csg-Indication |false |
| cellSelectionInfo |
| q-RxLevMin |-65 |
| freqBandIndicator |1 |
| schedulingInfoList |
| schedulingInfo |
| si-Periodicity |rf16 |
| sib-MappingInfo |
| schedulingInfo |
| si-Periodicity |rf32 |
| sib-MappingInfo |
| sIB-Type |sibType3 |
| sIB-Type |sibType6 |
| schedulingInfo |
| si-Periodicity |rf32 |
| sib-MappingInfo |
| sIB-Type |sibType5 |
| si-WindowLength |ms20 |
| systemInfoValueTag |22 |

This form of analysis provides an excellent grounding when conducting ICCSA.Why would that be so? Familiarisation with this education content enables knowledge to be gleaned from the real-world SIBs detected by the UE at particular locations. Importantly information that informs the UE about varying cells benefits an investigation.  For instance, we know that when the UE has successfully received and decoded MIB and SIBs type 1 and 2 etc during its travels SIB type9 might identify (H)eNobeB that is available. To be clear that latter information provides two unique pieces of information. (1) The identity of the radio source (2) it is location specific to tens of metres in an area thus refines location identification where the UE would have dwelt (dwell time - slow moving UE).

It also refines the location for the investigation and even where SIB1 and SIB2 provide a wider location area the UE detection (SIB type9) of the (H)eNobeB coverage would have the effect of demonstrating  pre-requisite requirement of proximity to an area. Now readers could point out how would the person conducting the ICCSA know about the (H)eNobeB in the first place if call/data records are not available. For those situations where immediate is important aspect of current bandit surveillance the UE stores relevant information of the radio resources in an area for up to 3-hours after which old data are discarded. For a live UE acquisition this time frame could be useful. For a UE switched off (e.g. at the target site area) retains that information and requires extraction and harvest without invoking UE power up and network detection and registration.

Tuesday, September 23, 2014

CSA - Site Survey Method/LTE-UMTS SIBs

There is a huge volume of materials and standards to be considered when undertaking study or work as an InnerCity CSA (ICCSA) expert, technician or student. However, the materials and standards referred to at my webblog aim to control the flow of such volumous information and provide instead an easy guide to seeking out the information experts, technicians or students can be exposed to when involved with ICCSA.

A highly defined smartphone etc can be offered services by a range of mobile network access systems e.g. GSM, GERAN, UTRAN, e-UTRAN etc when switched ON and actively in use or in idle mode. Access system information for LTE and UMTS are mapped in System Information Blocks (SIBs). When conducting ICCSA test measurement it is useful to identify which broadcasted SIBs contain data to help understand the survey results. Knowing the content allocated to SIBs can assist enormously in interpretation and when considering the propositions highlighted in the previous discussion thread -

Below are commonly referred to LTE/UMTS SIBs. GSM and GERAN data are mapped to System Information Types that will be given in the next discsssion.

LTE System Information Blocks
SIB 1 contains PLMN identity, tracking area code, and CI of the broadcasting cell. Q-RxLevMin minimumRSRP threshold that a broadcasting cell should be measured before initial cell selection, and later for random access performed by UE. SIB Mapping Info included to inform the UE which SIBs are transmitted and how they are scheduled.

SIB 2 contains timers and constants, access barring information, UL frequency information, and UL bandwidth information.

SIB 3 contains parameters for the cell reselection procedure.

SIB 4 contains neighbour cell information for intra-frequency cell reselection.

SIB 5 contains information for interfrequency cell reselection.

SIB 6 contains information for inter-RAT cell reselection to the UTRAN.

SIB 7 contains information for inter-RAT cell reselection to the GERAN.

SIB 8 contains information for inter-RAT cell reselection to CDMA2000.

SIB 9 is used to broadcast the home eNB name (HNB name).

SIB 10 and SIB 11 can be used to broadcast warning information to subscribers (e.g. tsunami warnings).

SIB 12 assigned for Commercial Mobile Alerting System (CMAS) information usage

UMTS System Information Blocks
SIB 1 NAS System Information, UE Timer and counter for RRC idle and connected mode

SIB 2 URA Identity

SIB 3 Parameter for Cell Selection and Cell Reselection

SIB 4 Parameter for Cell Selection and Cell Reselection in RRC connected mode

SIB 5 Parameter for configuration of Common Physical Channel (CPCH) of actual cell

SIB 6 Parameter for configuration of Common and shared Physical Channel of actual cell

SIB 7 Fast changing parameter for uplink Interference and Dynamic Persistent Level

SIB 8 Static CPCH Information of actual cell [FDD only]

SIB 9 CPCH Information of actual cell [FDD only]

SIB 10 Information for UE, which DCH is controlled by Dynamic Resource Allocation Control Procedure

SIB 11 Measurement Control Information of actual cell

SIB 12 Measurement Control Information of actual cell in RRC connected mode

SIB 13 ANSI-41 System Information

SIB 13.1 ANSI-41 RAND Information

SIB 13.2 ANSI-41 User Zone Identification

SIB 13.3 ANSI-41 Private Neighbour List

SIB 13.4 ANSI-41 Global Service Redirection

SIB 14 UL outer loop power control information for common and dedicated physical channels in RRC idle and connected mode

SIB 15 Information for UE positioning method

SIB 15.1 Information for UE GPS positioning method with Differential Global Positionig System (DGPS) correction

SIB 15.2 Information for GPS Navigation-Model

SIB 15.3 Information for GPS Almanac, ionospheric and UTC Model

SIB 15.4 Ciphering Information of SIB 15.5

SIB 15.5 Information for OTDOA UE positioning method

SIB 16 Information of Radio Bearer, transport and physical channels for UE in RRC idle or connection mode in case of Handover to UTRA

SIB 17 Fast changing parameter for the configuration of Shared Physical Channels in RRC conected mode [FDD only]

SIB 18 PLMN Identifies neighbour cells