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Radio Resource Management in LTE
Hos: Ericsson Research. Linköping
När: Ht -07
Krav: Civ Ing, gärna kommunikationsinriktning, minst 4 i snittbetyg
Beskrivning: Se nedan
Radio access technologies for cellular mobile networks are continuously being evolved to meet the future demands for higher data rates, improved coverage and capacity. Currently evolutions of the 3G systems, 3G Long Term Evolution (LTE), including new access technologies and new architectures are being developed by Ericsson and others. One of the main targets for LTE is that the access technology should be flexible to use in existing frequency allocations and new frequency allocations in order to allow for easy introduction in spectrum with existing deployments. Both FDD (Frequency Division Duplex) and TDD (Time Division Duplex) where up- and downlink are separated in frequency and in time respectively, will be supported. To allow for this flexible spectrum solutions the access technology chosen is based on OFDM (Orthogonal Frequency Division Multiplexing).
To efficiently manage the radio resources in LTE, fast dynamic scheduling is supported where, time and frequency resources can be assigned on a 1ms time frame. The scheduler may be provided with information on the channel quality (CQI), so for each sub-band the resource assignment can be based on channel quality. Typically the scheduler assigns users to the sub-bands where the channel is indicated to be good, i.e. channel dependent frequency domain scheduling. For downlink link adaptation and scheduling, CQI reports will be provided from the mobile terminal and sent in the uplink. Initial investigations show that there is a potential performance gain with channel dependent frequency domain scheduling. However, this gain comes with the cost of significant signaling overhead in the UL.
The master theses assignment is to assess the performance of the LTE DL with limited CQI reporting. The goal is to propose and evaluate some alternative methods for the triggering of CQI reports in both FDD and TDD frameworks.
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