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Thread: Huawei NMS fault U2000 troubleshoot guide

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    0210 very ffffffffffffffffffffffffffffffffffffffffffffffffff ffffffffffff


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    Good afternoon! qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq qqq




  3. Minimum 5G Requirements
    CQI PMI and RI - LTE Quality Indicators
    Difference between PUCCH and PUSCH
    LTE Device Ecosystem - July 2017
    Why VoLTE finally being rolled out ?
  4. #8
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    5G

    If you want 5G, there’s a good chance you'll need a small cell nearby to deliver it. Putting up that cell may be hard because of a host of problems, but Nokia Bell Labs thinks it can solve some of them with drones and tiny solar panels.
    Nokia's F-Cell is an experimental LTE small cell that doesn't need any wires. It gets power from solar panels on its surface and communicates with the carrier's core network over a high-speed wireless connection. No one even needs to climb up on a roof to install it: The company recently delivered an F-Cell to the roof of one of its buildings in Sunnyvale, Calif. using a drone.
    F-Cells won’t start showing up everywhere tomorrow, but anything to speed up small-cell deployment could make a big difference when 5G starts going live in 2020. The next generation of cellular will probably require dense networks of small cells to deliver the gigabit speeds being promised, and carriers will face both legal and technical hurdles when they try to put them up.
    Though 5G is expected to improve mobile services in several areas, including the internet of things, it will be the technology's eye-popping speeds of 5Gbps (bits per second) to 10Gbps that will call for small cells using millimeter-wave frequencies, said Tom Keathley, senior vice president of wireless network architecture and design at AT&T. They will be deployed first in dense urban areas, he said.
    Most cells today are mounted on towers placed an average of two kilometers (1.2 miles) apart, according to AT&T. Carriers typically have to get clearance from local governments, pay rent and run fiber or copper cables from the towers to their wired networks.
    In order to offer better performance to more subscribers, 5G networks are expected to use much higher frequencies that are harder to send over long distances. That will take smaller cells, spaced only about 250 meters (820 feet) apart, so all the headaches of deploying a cell will be repeated many more times.
    There are about 200,000 cells in the U.S. now, but there may be millions in the coming 5G era, Federal Communications Commission Chairman Tom Wheeler warned last month. Neighborhoods that block small cells because of health or aesthetic concerns could miss out on 5G, he said. The FCC is now working to streamline cell site approvals.
    The F-Cell is designed to solve the technical challenges. It doesn't need a power cord because it’s powered by the sun, and it doesn't need a cable because it connects to the wired network through a central wireless hub that can serve several F-Cells.
    In Nokia’s demonstration, a drone carried an F-Cell to the roof of the building and dropped it off, leaving the cell to turn itself on, configure itself and automatically connect to the wireless backhaul network.
    That network is built around a closed-loop, 64-antenna system that uses massive MIMO (multiple in, multiple out) technology. It forms eight radio beams to communicate with eight F-Cells.
    Each cell has a total system throughput of about 1Gbps and, with enhancements and higher frequencies, that could grow to tens of gigabits per second, Nokia says.
    A "drop and forget" cell like the F-Cell would make small-cell deployments simpler and cheaper, said Tolaga Research analyst Phil Marshall. But it wouldn’t help with issues like zoning and negotiations with landlords, which are already big challenges, he said.
    AT&T is already making deals with municipalities to mount LTE small cells on light poles and other sites, Keathley said. One such deal can give the carrier access to small-cell locations throughout a city, and by the time 5G is available, AT&T will have laid much of the groundwork for that next deployment, he said.
    Marshall doesn't think current methods for getting small cells into cities will suffice for 5G. Carriers need new approaches, like sharing sites with rival operators, offering free Wi-Fi from the sites or using them to help cities deliver services, he said. "5G will need a heap of sites."


  5. #9
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    TBF Drop Improvement tips in Huawei GSM
    TBF drop is KPI(Key Performances Indicator) which is related to 2G data call GPRS/EDGE in GSM Network. TBF drop indicate how often your services disconnected when you in GPRS or EDGE data Services. There are some tips how to improve TBF drop rate in GSM Huawei. You can follow below steps to improve TBF Drop Rate in GSM Huawei.
    - Make sure no Hardware problem especially related TRX module. You need to fix Hardware issue first if you found hardware problem
    - Make sure no Interference. You have to do re-tune or change frequency that suspected Frequency Interference to improve TBF drop rate
    - Make sure No overshooting Cells. You can adjust Antenna Tilt/Down tilt for overshooting cells to improve TBF drop rate and avoid access traffic in low RX level thus can improve TBF drop call.
    - Reduce Dynamic PDCH(MAXPDCHRATE) and add static PDTCH to avoid preemption channel by voice services especially for cells with high Voice traffic.
    -Shifting Static PDCH from TRX non BCCH to TRX BCCH and make priority setting by set TRX layering priority which can be set by OPTL value in GTRXDEV object.With this strategy data services will be concentrated in TRX BCCH with full power(no power control) thus can improve TBF drop rate and getting better than data services in TRX non BCCH.
    - Increase timer T3168 and T3192
    T3168 is used to set the maximum duration for the MS to wait for the uplink assignment message. After the MS originates the uplink TBF setup request by sending the packet resource request or the channel request in the packet uplink acknowledge message, the timer T3168 is started to wait for the packet uplink assignment message on the network side. If the MS receives the packet uplink assignment message before T3168 expires, T3168 is reset. Otherwise, the MS originates the packet access request for four times. Then the MS regards this as the TBF setup failure.
    T3192: Duration of releasing the TBF after the MS receives the last data block. When the MS receives the RLC data block containing the flag identifying the last data block and confirms that all the RLC data blocks in the TBF are received, the MS sends the packet downlink acknowledge message containing the last flag acknowledgement and the timer T3192 is started. If the timer T3192 expires, the MS releases the TBF related resources and starts monitoring the paging channel. During TBF releasing, if the MS is the half duplex mode and receives the packet uplink assignment, the MS responds this command. During TBF releasing, if the MS is the half duplex mode and receives no packet uplink assignment message, the MS enters the packet idle mode. If the MS is in the dual transmission mode, the MS enters the special mode.
    - Increase timer N3101,Ex: from 30 to 90
    Detail description of N3101:
    Maximum value of the N3101 counter. In the dynamic uplink allocation mode, the network side enables multiple MSs to share the same uplink channel through the USF value in the downlink data block. After the network side allocates the USF to the uplink TBF (the uplink TBF is set up successfully), N3101 is started. The network side waits for the RLC uplink data block sent by the MS. If the RLC uplink data block sent by the MS is valid, N3101 is reset. Otherwise, the value of N3101 is increased on the network side. When this counter is overflowed, the current uplink TBF is released abnormally.
    - Increase timer N3103 and N3105
    Detail description of N3103 and N3105
    N3103: Maximum value of the N3101 counter. When the uplink transmission ends, if the network side receives the last RLC data block, the network side sends an FAI=1 uplink packet acknowledged/unacknowledged message and starts N3103. If the packet control acknowledgement message is not received in the specified time, N3103 is increased on the network side and the uplink packet acknowledged/unacknowledged message is retransmitted. When this counter is overflowed, the timer T3169 is started. After this timer expires, the current TBF is released abnormally.
    N3105: Maximum value of the N3105 counter. After the downlink TBF is set up successfully, the N3105 is started on the network side. After the downlink RLC data block is added with the RRBP domain on the network side, the valid packet acknowledged message responded by the MS is received in the uplink RLC data block in the RRBP domain. In this case, N3105 is reset. Otherwise, the value of N3105 is increased and the downlink data block of the RRBP is retransmitted. When N3105 is overflowed, T3195 is started. After the timer T3195 expires, the current TBF is released abnormally.
    - Change LQC(Link Quality Control Mode) from IR to LA
    LQC Detail description:
    It is applicable to the radio transmission environment to improve the link quality. Link adaptation (LA) indicates adjusting the coding mode of the channel dynamically according to the transmission quality of the link. The link transmission quality is measured by the 8PSK MEAN BEP and 8PSK CV BEP in the Packet EGPRS Downlink Ack/Nack message sent by the MS. The network side determines the coding mode for data transmission according to the radio measurement report sent by the MS. The cell with the good transmission quality on the air interface is set to the LA mode. Increment redundancy (IR) mode requires the network side retransmit the data block with different punching codes and the MS store the historical error information. The data block is retransmitted through cooperated error correction function. With the IR mode, the transmission quality on the air interface of the cell can be improved. However, the MS must support this IR mode. The cell with the dissatisfied transmission quality on the air interface is set to the LR mode.

    Thanks for read this note,You can share your suggestion how to improve TBF drop rate in GSM Network based on your experiences by add comment.


  6. #10
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    Tch optimization

    TCH Block Rate Optimization Tips in Huawei GSM
    TCH Block Rate is familiar KPI in GSM Networks. TCH Block rate indicate percentage of blocking on TCH(Traffic channel) due to lack of traffic channel in a cell. In this note I would like to share how to optimize TCH Bloking rate step by step in order to reduce TCH blocking and configure channel capacity based on traffic needed. Below are steps you need to follow based on my daily optimization activity in my project in Indonesia.
    • Check for hardware, make sure no hardware issue.
    Hardware checking always the first thing you need to check. You have to make sure no hardware issue before go to next optimization step.Your next action will be useless if the problem of the KPI is hardware issue.If found hardware issue please follow up first to FLM(Field Maintenance) or Project Team to check and troubleshoot. You can check from active alarm and especially from TCH Availability to make sure no TRX module faulty. If found no hardware issue then go to next step.
    • Check for Coverage, make sure no Overshooting
    Coverage also need to check to make sure no overshooting and cover so far area that will trigger TCH Blocking due to cover unnecessary location and huge traffic.If found overshooting then you need to adjust Antenna tilt.If found no problem with coverage the go to next step.
    • Check for Current Channel Configuration, make sure no over dimension of other channel(SDCCH, BCH and PDTCH)
    Current channel configuration need to check to make sure no over dimension of other channel(ex:SDCCH,BCH or PDTCH). For SDCCH You can refer to number of TRX, usually the number of SDCCH in a cell same as number of TRX on that cell(ex: number of SDCCH =2 if TRX number =2), except for other case such as high SD traffic cell or covering Event, number of SDCCH may be different. for BCH usually maximum 2 channel in 1 Cell. and for PDTCH usually 1 static PDTCH for 1 TRX(same as SDCCH),except for high PS Traffic cells. After make sure no over dimension channel of other channel(beside TCH), then go to next step
    • Calculate TCH needed based on Erlang B Calculation
    Now you need to generate measurement related TCH Traffic maximum on the Cell then calculate besed on Erlang B Table. After get TCH Traffic measurement on Busy Hour Cells then you can calculate how many channel needed to accommodate TCH traffic. Click here to calculate channel required for TCH based on Erlang B calculation.
    • Change Half Rate Threshold/Re-Dimension Channel/Upgrade TRX
    Based on Elang B calculation now you get how many channel TCH needed to accommodate traffic on TCH. Then you can go to Upgrade or Change other Channel into TCH or Change Half Rate setting(TCHBUSYTHRES/AMRTCHPRIORLOAD in Huawei Parameter).You can go to upgrade TRX if Half rate setting already maximum(TCHBUSYTHRESS=0) and additional channel required need add TRX ( 1 TRX = 8 Channel TCHFR) and also no possibility to change other channel into TCH.

    Summary to Optimize TCH Block rate:
    - Check Hardware problem, make sure no hardware problem occurred.
    - Check Coverage, make sure no overshooting to avoid cells cover unnecessary traffic/Covering far area.
    - Check Channel Configuration, make sure no over dimension of other channel(SDCCH, BCH and PDCH)
    - Calculate TCH Needed based on Erlang B Calculation
    - Change Half Rate Setting(TCHBUSYTHRESS and AMRTCHPRIORLOAD)/Channel re-dimension(Change other channel into TCHFR)/Upgrade TRX


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