Download - Probation Presentation
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Confidential
Security Level: 23/4/10
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Probation Presentation for Ufone Phase 5 Project
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Contents
Work done during probation
Trouble Shooting In The Field
Introduction To GSM Radio Channels
Contents Of Timing Slots
Problem Locating In Radio Channels
Synopsis
HUAWEI TECHNOLOGIES CO., LTD. Page 3Huawei Confidential
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Work done during probation
• Drive test with Huaxin sub-con at U-FONE Phase A sites in the region
• Neighbors list adding and verification before DT to ensure the smooth work done during testing
• KPI analysis, worst cells locating and its diagnosis
• New KPI task creation as per requirement or client recommendation
• Parallel checking/verification of sub-con KPI report for precision
• Managing, coordinating & Report updating with RNP sub-cons
• Making sure the sub-cons enough equipment and man power for project as well as for swap sites
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Contents
Work done during probation
Trouble Shooting In The Field
Introduction To GSM Radio Channels
Contents Of Timing Slots
Problem Locating In Radio Channels
Synopsis
HUAWEI TECHNOLOGIES CO., LTD. Page 5Huawei Confidential
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Trouble Shooting In The Field
• During DT at site 9727 (Phase-A), neighbor list was updated/modified after feedback from the location
• Sector-2 of the 9727 cell had to handover its service to another nearby neighbor site while receiving higher RxL in the major lobe of candidate cell
• Even RxL became -110 dB at 20 Km from serving cell and call dropped. At that time the RxL of candidate cell was -60 dB
• Then call originated from candidate cell and moved towards the major lobe of sector-2 of site 9727
• When approaching at 10 Km away from target sector comparatively higher RxL observed and successful handover occurred
• Hence sector-2 was added in candidate cell but candidate wasn’t added
HUAWEI TECHNOLOGIES CO., LTD. Page 6Huawei Confidential
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Site : 9727
Candidate Cell
22 Km
ILLUSTRATION:
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Contents
Work done during probation
Trouble Shooting In The Field
Introduction To GSM Logical Channels
Contents Of Timing Slots
Problem Locating In Radio Channels
Synopsis
HUAWEI TECHNOLOGIES CO., LTD. Page 8Huawei Confidential
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Broadcast control channel (BCCH) Control channel
Common control channel (CCCH)
Voice channel(TCH)
FCH SCH BCCH TCH - FAGCH RACH SDCCH FACCH
SACCH
TCH - H
TCH - 9.6 FTCH - 4.8 F, HTCH - 2.4 F, H
PCH
Common channel (CCH)
Dedicated channel (DCH)
Logical channel
Introduction To GSM Logical ChannelsIntroduction To GSM Logical Channels
GSM900 and DCS1800 have the same logical channel
category
HUAWEI TECHNOLOGIES CO., LTD. Page 9Huawei Confidential
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Introduction To GSM Logical ChannelsIntroduction To GSM Logical Channels
SDCCH
SACCH
FACCH
TCH/H
TCH/F
Bi- DirectionalDedicated ChannelsFCCCH
AGCHBCCH
PCCH RACCHSCH
Up Link Common Channels
CCCHCCCH
Down Link Common Channels
BCCH
TCH
DCCH
Up Link-Down LinkLogical Channels
HUAWEI TECHNOLOGIES CO., LTD. Page 10Huawei Confidential
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Introduction To GSM Logical ChannelsIntroduction To GSM Logical Channels
Search for frequency correction burst
Search for synchronization sequence
Read system information
Listen paging message
Send access burst
Wait for signaling channel allocation
Call setup
Assign traffic channel
Conversation
Call release
FCCH
SCH
BCCH
PCH
RACH
AGCH
SDCCH
SDCCH
TCH
FACCH
OFF STATE
IDLE STATE
DEDICATED STATE
FLOW CHART
HUAWEI TECHNOLOGIES CO., LTD. Page 11Huawei Confidential
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Introduction To GSM Logical ChannelsIntroduction To GSM Logical Channels
Mob
ile S
tati
on B
ase S
tatio
nReverse common channel signaling
FCCH (frequency correction)
PCH (paging channel)
SCH (synchronization)
BCCH (broadcast common)
SACCH (slow associated)
AGCH (access grant)
Forward common channel signalingRACH (random access)
Dedicated point to point channelTCH (traffic)
FACCH (fast associated)
11
22
33
66
44
77
88aa
88bb
88cc
SDCCH (stand alone)55
HUAWEI TECHNOLOGIES CO., LTD. Page 12Huawei Confidential
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Contents
Work done during probation
Trouble Shooting In The Field
Introduction To GSM Logical Channels
Contents Of Timing Slots
Problem Locating In Radio Channels
Synopsis
HUAWEI TECHNOLOGIES CO., LTD. Page 13Huawei Confidential
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Contents Of Timing Slots
0 1 2 3 2044 2045 2046 2047
0 1 2 3 48 49 5047
0 1 24 25
0 1 24 25 1 49 500
0 1 4 5 762 3
TB3
TB3
GP8.25 TB: Tail bit
TB3
TB3
GP8.25
GP: Guard periodTB3
TB3
GP8.25
TB3
TB3 GP 68.25
58 information bits 26 training sequences 58 information bits
Constant bit 142
Information bit 39 Extended training sequence 64Information bit 39
Synchronous sequence 41 Information bit 36
Normal burst (NB)
Frequency correction burst (FB)
Synchronous burst (SB)
Access burst (AB)
1 hyper frame=2048 super-frames=2715648TDMA frames (3 hours, 28 minutes, 53 seconds and 760 milliseconds)
1 super-frame=1326TDMA frames (6.12 seconds)
1 multiframe=26TDMA frames (120ms) 1 multiframe=51TDMA frames (3060/13ms)
1TDMA frame=8 timeslots (120/26=4.615ms)
1 timeslot=156.25 bit duration (15/26=0.577ms)(1 bit duration: 48/13=3.68us)
BCCHCCCHSDCCH
TCHSACCH/TFACCH
HUAWEI TECHNOLOGIES CO., LTD. Page 14Huawei Confidential
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Contents Of Timing Slots
8bit 41 synchronous bits
36 encrypted bits 3bit 68.25bit
Tail bit Tail bit Guard intervalData
• Access burst (AB): Used in MS initial access
Guard interval
3bit 142bit 3bit 8.25bit
Tail bit Tail bitData
• Frequency correction burst (FB): Used in frequency synchronization between MS and BTS
3bit 39 encrypted bits
39 encrypted bits
3bit 8.25bit
Tail bit Tail bit Guard intervalDataData
64 synchronous bits
• Synchronous burst (SB): Used in timing synchronization between MS and BTS
1
2
3
HUAWEI TECHNOLOGIES CO., LTD. Page 15Huawei Confidential
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3bit 142 modulation bits 3bit 8.25bit
Tail bit Tail bit Guard interval
Dummy burst (DB): Used in transmission of filling frames by BTS at timeslots when there is no information delivered
3bit 57 encrypted bits 57 encrypted bits 3bit 8.25bit
Tail bit Tail bit Guard intervalDataData
26bit1 1
Training sequence
Frame stealing
flag
Normal burst (NB): Used to carry the information of the traffic channel and the control channel except for RACH
Contents Of Timing Slots
4
5
HUAWEI TECHNOLOGIES CO., LTD. Page 16Huawei Confidential
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Contents Of Timing Slots• FCH: Physical channel precisely locked with correct downlink frequency
• SCH: Synchronizes with timing slots reserved/allocated at the requisition
• BCCH: Continuously identifying Overhead information, frequency allocations, frequency-hopping sequences, area code • RACH: Sends a request for SDCCH, when MS wishes to access the system
• AGCH: Response of RACH with dedicated channel assignment
• SDCCH: Identification and authentication
• SACCH: Link control and measurement data during call
• FACCH: Carry user authentication & handover parameter, steals part of TCH
• TCH: Voice carrying dual duplex channel, for half & full rate data transfer
HUAWEI TECHNOLOGIES CO., LTD. Page 17Huawei Confidential
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Contents
Work done during probation
Trouble Shooting In The Field
Introduction To GSM Radio Channels
Contents Of Timing Slots
Problem Locating In Radio Channels
Synopsis
HUAWEI TECHNOLOGIES CO., LTD. Page 18Huawei Confidential
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Problem Locating In Radio Channels
• The Frequency correction (FCH), synchronization (SCH) and random access channels (RACH) are transmitted in single burst each, and thus the use of interleaving between bursts
• After synchronization with correct frequency and timing slots if MS displays no service then BCCH frequency may not updating the device
• No access may occur even after location updating, could cause congestion, or connection error due to occupation of improper timing slots
MS unable to identify network or access the
network
HUAWEI TECHNOLOGIES CO., LTD. Page 19Huawei Confidential
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Problem Locating In Radio Channels
• RACH may not be fulfill even after successful BCCH updates
• SDCCH congestion rate may allow TCH to allocate directly, so drop may also occur during the allocation
• AGCH allocation with some parameters updating may cause failure to an attempt
• After synchronization with SDCCH authentication/encryption acknowledge process requires private key to encode/decode
MS call setup attempt
failure
HUAWEI TECHNOLOGIES CO., LTD. Page 20Huawei Confidential
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Problem Locating In Radio Channels
RACHRACH
RACHRACH
TCH (FACCH)TCH (FACCH)
SDCCHSDCCH TCH (DATA)TCH (DATA)
TCH (DATA)TCH (DATA)
Voice transferCall setup signaling
Assignment channels when destination channel is set to TCH
TCH (Early)
SDCCH (Normal)
HUAWEI TECHNOLOGIES CO., LTD. Page 21Huawei Confidential
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Problem Locating In Radio Channels
Logical channel combinations
• Full rate traffic channel combination -- TCH8/FACCH+SACCH
• Broadcast channel combination -- BCCH + CCCH
• Dedicated channel combination -- SDCCH + SACCH8
• Combined channel combination -- BCCH + CCCH + SDCCH4 + SACCH4
HUAWEI TECHNOLOGIES CO., LTD. Page 22Huawei Confidential
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Channel combination
Traffic
Dedicated
Combined
Broadcast
Time slots
Any time slot
0,2,4,6 (0 must used first)
Any time slot
0 only
Problem Locating In Radio Channels
0 4321 65 7
0 4321 65 7
1
Combined Traffic
Low & High capacity cells
Broadcast Dedicated Traffic
Contents
Work done during probation
Trouble Shooting In The Field
Introduction To GSM Radio Channels
Contents Of Timing Slots
Problem Locating In Radio Channels
Synopsis
HUAWEI TECHNOLOGIES CO., LTD. Page 24Huawei Confidential
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Synopsis
Some GSM system parameters are listed below.
Multiple Access Method, TDMA / FDMABase station to mobile frequencies, (MHz)935-960 (basic GSM)Mobile to base station frequencies, (MHz)890-915 (basic GSM)Duplexing, FDD/HDDChannel spacing, 200 kHzModulation GMSKPortable TX power, maximum / average, 1000 / 125 (mW)
Power control, handset and BSS, YesSpeech coding and rate, 2.4/4.8/9.6/HDD (kbps) & 13/FDD (kbps)
Speech Channels per RF channel: Eight (8)Channel rate, 270.833 (kbps) Channel coding Rate, 1/2 convolutionalFrame duration, 4.615 (ms)
Thank You
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