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Enhancements for Small Cells in 3GPP Release-12
 

Enhancements for Small Cells in 3GPP Release-12

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Presented by Matthew Baker, Alcatel-Lucent, Chairman 3GPP TSG RAN WG1 in Small Cells World Summit 2013 in London.

Presented by Matthew Baker, Alcatel-Lucent, Chairman 3GPP TSG RAN WG1 in Small Cells World Summit 2013 in London.

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    Enhancements for Small Cells in 3GPP Release-12 Enhancements for Small Cells in 3GPP Release-12 Presentation Transcript

    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 1 Matthew Baker Chairman 3GPP TSG RAN WG1 Alcatel-Lucent From Macro to Small Cells:From Macro to Small Cells: Enhancements for Small Cells in 3GPPEnhancements for Small Cells in 3GPP Small Cells Summit 2013 London, UK
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 2 Mobile broadband data is exploding Mobile broadband data is driving the need for network capacity MOBILE DATA TRAFFIC WILL GROW >25 TIMES BY 2016 TODAY DATA is 90% of traffic Source: Traffic Index, 2012 - Bell Labs Modeling PB/MONTH 2016 2011
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 3 How to address the demand? More spectrum? frequency Interworking with other Radio Access Technologies (e.g. WiFi)? 3GPP CN Internet LTE WLAN • Essential, but… • Capacity only grows linearly with spectrum usage Interworking with other Radio Access Technologies (e.g. WiFi)? • Useful, but… • Uniformity of service provision and of QoS are needed • Spectrum for other RATs is still finite
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 4 Advanced multiple antenna configurations? • 3D beamforming Centralized BBU pool Controller • CoMP All give incremental gains in capacity, together with increasing complexity • Massive MIMO
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 5 More cells, smaller cells Miniaturised base stations Low power Deployed wherever demand dictates INCREASED PER-USER THROUGHPUT REDUCED COST PER BIT POTENTIAL FOR ORDERS-OF-MAGNITUDE HIGHER CAPACITY Small Cells Small cells are the primary route to higher capacity From to
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 6 Small Cells in LTE Release 8 Release 9 Release 10 Release 11 Release 12 Small cells have been supported by the LTE specifications since the beginning of LTE; Frequency-domain inter-cell interference coordination (ICIC) New base station classes introduced for local area and home deployments Additional time-domain ICIC can be used in het nets of macro and isolated small cells Pico Further optimizations and enhancements for small cells, including dense small cell deployments Macro Macro Picos
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 7 Scenarios for optimisation in Release 12
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 8 Study of possible optimisations for specific characteristics unique to small cell deployments Small Cell Enhancements in Release 12 • Further enhancements to management of interference conditions • Especially between small cells in dense clusters of small cells in hotzones – Opportunities for traditional cell planning may be limited when large numbers of small cells are situated according to traffic patterns – Existing cells cannot necessarily be moved when new cells are inserted • • – – • Techniques include: – Frequency-domain coordination – Time-domain coordination • • – – • – – – Transmission power management • • – – • – – – – Switching on/off small cells » Match capacity to load » Reduce interference » Save energy • • – – • – – – – » » » – Coordinated scheduling / coordinated beamforming
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 9 3GPP supports coordination across standardised interfaces Practical backhaul connectivity • Since small cells will be deployed based on demand, backhaul connectivity typically has non-negligible latency • Like existing techniques, any new techniques in Release 12 need to operate successfully in a distributed manner with realistic inter-cell latencies over standardised interfaces • Centralised coordination usually cannot be assumed 5-35msWireless Backhaul 25-35msCable 15-60msDSL Access 2-30msFibre Latency (One way)Non-ideal Backhaul Technology
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 10 Further radio optimisations may take into account specific characteristics of small cell environment • User Equipment mobility is typically low • Relatively long channel coherence time • Impact on handover rate • Low delay spread / frequency-selectivity • Wide range of SINRs • In isolated small cells, SINR may be high • In dense small cell deployments, SINR may be lower – Multiple strong interferers Study optimisation of traffic handling and handover based on UE speed Study possibilities for overhead reduction Study feasibility of higher-order modulation Interference management techniques
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 11 Small cell discovery • Large numbers of small cells may create new challenges for UEs to detect the best small cells to be associated with • Switching on/off of small cells for load balancing or interference management may necessitate new mechanisms for small cell discovery Possibilities for dual connectivity • Study any potential benefits of simultaneous connection to macro and small cells Pico Macro
    • © 3GPP 2009 Mobile World Congress, Barcelona, 19th February 2009Small Cells in 3GPP matthew.baker@alcatel-lucent.com 12 The way ahead Small cells uniquely provide the ability to meet the demands of data traffic growth Large numbers of small cells may be deployed where demand dictates 3GPP specifications are continuing to evolve to optimise performance for the specific characteristics of widespread small cell deployment