Monday, April 21, 2014

Carrier Aggregation: UE Capability


To configure Carrier Aggregation, Network send Secondary Cell (SCell) configuration to only those UEs which are release 10 and support Carrier Aggregation. Otherwise, UE wouldn't be able to process the SCell configuration from the network and abnormal things will happen. Also, network should be aware of for which all band combinations CA can be configured i.e. which band's cell should be used for SCell.

Now question here is, how would network know if UE is supporting Carrier Aggregation or not and if supporting, which all band combinations can be used for CA?? The answer is UECapabilityInformation Message. During Lte Registration procedure, UE reports detailed Carrier Aggregation (CA) capability in UECapabilityInfomration Message. Please refer the following MSC:


3GPP References
As per spec 36,331, UECapabilityInformation has following release 10 IEs:

Friday, August 9, 2013

VoLTE Benefits

VoLTE Benefits
The reasons for using VoLTE instead of separated voice/data solutions are numerous:
1. VoLTE is simple and reliable: With its guaranteed QoS, VoLTE offers an operator’s subscribers a robust alternative to OTT VoIP in an easy-to-use mechanism. Users know that they can rely and enjoy carrier-grade services without disruption or uncertainty.
2. VoLTE exceeds OTT VoIP and even 3G voice quality: Through the use of Adaptive Multirate Wideband (AMR-WB) codecs (12.65kbps or 23.85kpbs) and QoS Class Identifier (QCI) SIP signalling, VoLTE provides “HD Voice” for a noticeably better end user experience compared to OTT VoIP and even 3G
3. VoLTE reduces the work to provide rich media services: As explained previously, in VoLTE, operators have a foundation for using RCS to enable video and file sharing, presence, instant messaging and enhanced phonebook services. An operator who has already implement VoLTE is closer to implementing RCS than a non-VoLTE operator.
4. VoLTE is spectrally efficient: Because of LTE’s all-IP architecture and new features in 3GPP releases (such as MIMO antenna technology), voice requires less bandwidth in LTE spectrum than it does in 2G/3G networks. Consequently operators have more available data capacity in their bands for a given voice load.
5. VoLTE reduces operator Opex: VoLTE simplifies the network by providing data and voice services on the same IP network, allowing operators to integrate network resources, optimize network and service management, and simplify service delivery.
6. VoLTE accelerates evolution to LTE: With VoLTE, an operator can offer voice service in its LTE spectrum while harvesting its 2G/3G spectrum for re-deploying additional LTE bandwidth. This migration process is easier for subscribers and limits operator upgrade costs.

Tuesday, August 28, 2012

What is RTWP?

Its Received Total Wideband Power.
the total level of noise within the UMTS frequency band of any cell.RTWP is related to uplink interference.Because of Uplink Interference you faced call drop.Actually its indication of Uplink Interference in Cellular Network.
- Most common problem is Configuration Issue.So Check from RNC end.
- Check Hardware loose Jumper cable or faulty transmitter.
- Every thing is ok than may issue of external interference.


General value is nearly -104 or -105 dBm.
Possible Solution for RTWP:
- Most common problem is Configuration Issue.So Check from RNC end.
- Check Hardware loose Jumper cable or faulty transmitter.
- Every thing is ok than may issue of external interference.

Thursday, August 16, 2012

Sprint: Ethernet backhaul gives us 20 times more bandwidth



Sprint Nextel's upgrade of its backhaul network from T1s to Ethernet will create such better efficiency for the company that it will reduce the cost of delivering data, even as consumer demand for data skyrockets. In fact, making the switch to Ethernet backhaul will give Sprint 20 times the bandwidth capacity at a cell site location, said a Sprint executive.

FCC allows T-Mobile to test spectrum sharing in 1755-1780 MHz band


The FCC granted permission to T-Mobile USA to test the concept of sharing spectrum between federal and commercial users in the 1755-1780 MHz band. The pilot program is part of a larger government effort to use spectrum sharing technology to help meet mobile broadband demand.
FCC Chairman Julius Genachowski said in a statement that by granting the authorization, the commission "hopes to facilitate commercial mobile broadband services in that band, which would significantly benefit millions of U.S. wireless consumers and help drive the mobile innovation economy." The tests are aimed at measuring the impact spectrum sharing will have on commercial carriers as they seek to deploy LTE.

Friday, August 3, 2012

RRM functions


Radio Bearer Control (RBC)

The establishment, maintenance and release of Radio Bearers involve the configuration of radio resources associated with them. When setting up a radio bearer for a service, radio bearer control (RBC) takes into account the overall resource situation in E-UTRAN, the QoS requirements of in-progress sessions and the QoS requirement for the new service. RBC is also concerned with the maintenance of radio bearers of in-progress sessions at the change of the radio resource situation due to mobility or other reasons. RBC is involved in the release of radio resources associated with radio bearers at session termination, handover or at other occasions. RBC is located in the eNB.

Radio Admission Control (RAC)

The task of radio admission control (RAC) is to admit or reject the establishment requests for new radio bearers. In order to do this, RAC takes into account the overall resource situation in E-UTRAN, the QoS requirements, the priority levels and the provided QoS of in-progress sessions and the QoS requirement of the new radio bearer request. The goal of RAC is to ensure high radio resource utilization (by accepting radio bearer requests as long as radio resources available) and at the same time to ensure proper QoS for in-progress sessions (by rejecting radio bearer requests when they cannot be accommodated). RAC is located in the eNB.

Connection Mobility Control (CMC)

Connection mobility control (CMC) is concerned with the management of radio resources in connection with idle or connected mode mobility. In idle mode, the cell reselection algorithms are controlled by setting of parameters (thresholds and hysteresis values) that define the best cell and/or determine when the UE should select a new cell.

Also, E-UTRAN broadcasts parameters that configure the UE measurement and reporting procedures. In connected mode, the mobility of radio connections has to be supported. Handover decisions may be based on UE and eNB measurements. In addition, handover decisions may take other inputs, such as neighbour cell load, traffic distribution, transport and hardware resources and Operator defined policies into account. CMC is located in the eNB.

Dynamic Resource Allocation (DRA) - Packet Scheduling (PS)

The task of dynamic resource allocation (DRA) or packet scheduling (PS) is to allocate and de-allocate resources (including buffer and processing resources and resource blocks (i.e. chunks)) to user and control plane packets. DRA involves several sub-tasks, including the selection of radio bearers whose packets are to be scheduled and managing the necessary resources (e.g. the power levels or the specific resource blocks used). PS typically takes into account the QoS requirements associated with the radio bearers, the channel quality information for UEs, buffer status, interference situation, etc. DRA may also take into account restrictions or preferences on some of the available resource blocks or resource block sets due to inter-cell interference coordination considerations. DRA is located in the eNB.

Inter-cell Interference Coordination (ICIC)

Inter-cell interference coordination has the task to manage radio resources such that inter-cell interference is kept under control. ICIC mechanism includes a frequency domain component and time domain component. ICIC is inherently a multi-cell RRM function that needs to take into account information (e.g. the resource usage status and traffic load situation) from multiple cells. The preferred ICIC method may be different in the uplink and downlink. The frequency domain ICIC manages radio resource, notably the radio resource blocks.

For the time domain ICIC, Almost Blank Subframes (ABSs) are used to protect resources receiving strong inter-cell interference. MBSFN subframes can be used for time domain ICIC when they are also included in ABS patterns. The eNB cannot configure MBSFN subframes [4] as ABSs when these MBSFN subframes are used for other usages (e.g., MBMS, LCS). ICIC is located in the eNB.

Tuesday, July 31, 2012

MTS to launch LTE on 1 September



Russian mobile operator MTS will start sales of its MTS Connect packages supporting LTE in the Moscow region soon. Wimax subscribers of its subsidiary Comstar will switch to the LTE technology from 7 August, the operator announced. The commercial launch of LTE services from the operator will start in Moscow from 1 September.