Carrier Aggregation support for the LTE module
Student: Danilo Abrignani
- Abstract: 3GPP standardizes, in release R10, the Carrier Aggregation (CA) technology. This consists of the possibility, for a single user equipment (UE), to aggregate Radio Resources belonging to different carriers, in order to have more bandwidth available, and a higher potential throughput. The idea is to improve the current LENA implementation, with CA functionalities, by implementing a sort of “proxy” between the RLC/RRC layer and MAC/Scheduler layers, associated to the multiple carriers.
- Code: http://code.nsnam.org/daniloa/ns-3-dev-lte-ca/
- About me: I'm a Ph.D. candidate at the University of Bologna, Italy. My research interests are in wireless sensor network and mobile network simulation. Something more about me on my Linkedin page.
- 1st Week:
* Implementation of RRC messages for Carrier Aggregation support * Writing design documentation
- 2nd - 4th Weeks:
* Implementation of the LTE-A helper, activation of different carriers and synchronization procedure. * Writing test code and debugging. * Writing design documentation
- 5th - 6th Weeks:
* Write test documentation, submit code for review, consolidate code and documentation.
- 7th -8th Weeks:
* Start writing the CA-Mac module, design documentation. * Write test and debugging, writing test documentation, submit code for review.
- 9th - 10th Weeks:"'
* Define a basic algorithm that takes into account QoS indicators. Write design documentation * Writing test application and debugging. Submit code for review. Update code and documentation.
- 11th - 12th Weeks:
* Unified LTE-A and LTE helpers. * Write test applications, update documentation and code. * Possible improvements.
Week 1 (May 25, 2015 - May 31, 2015)
First week of coding phase has delivered the following:
- Implementation of RRC messages for Carrier Aggregation support
- Implementation of CcsAlgorithm abstract class which will be base class for Carrier Component Selection (CCS) algorithms
- Implementation of SAPs
- LteHelper was updated to install CCS entity and SAPs during setting up EnbNetDevice. However, currently no ccs algorithm is implementing.
Week 2 (June 01, 2015 - June 07, 2015)
In summary, this week I delivered the following:
- Minor error fix on RRC SAP
- ASN1 - RRC coding implemented:
- Basically I implemented the serialize and deserialize method for coding the new fields in the rrcConfigurationReconfiguration message.
- Minor change in ASN1 Header, i.e. adding a function template in order to match a new bit mask, the latter it is used to enable or disable optional fields in RRC headers.
- Tested carriers aggregation CA enable procedure (messages exchange) when RrcIdeal is false.
- LTE-A HetNets using Carrier Aggregation, Nomor whitepaper 
- 3GPP TS 36.211
- 3GPP TS 36.213
- 3GPP TS 36.331