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SC-PTM, an agile broadcast/multicast mechanism

January 28, 2016

By Jeff Gao, Rapporteur for 3GPP Support of single-cell point-to-multipoint transmission in LTE.

Broadcast/Multicast services have been earmarked as a potential area of growth in the future. Single Cell Point To Multiploint (SC-PTM) uses the eMBMS system architecture, providing enhancements in the air interface to improve radio efficiency and to reduce latency. SC-PTM supports broadcast/multicast services over single cell, and the broadcast/multicast area can be dynamically adjusted cell by cell according to user’s distribution.

SC-PTM transfers the broadcast/multicast services using LTE downlink shared channel (i.e. PDSCH), and it is scheduled using a common RNTI (i.e. Group-RNTI) for a group of users. The SC-PTM scheduling is quite agile and radio resources could be dynamically assigned in time and frequency domain by PDCCH based on real time traffic load TTI by TTI.

SC-PTM is especially suitable for scenarios where broadcast/ multicast service is expected to be delivered to a limited number of cells due to user interests and the concerned cells may dynamically change due to user movement. SC-PTM allows efficient radio utilisation and flexible deployment of number of applications, e.g. critical communications, traffic information for cars and on-demand TV services, etc.

 Further reading:

680064

 Support of single-cell point-to-multipoint transmission in LTE

LTE_SC_PTM

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680164

Core part: Support of single-cell point-to-multipoint transmission in LTE

LTE_SC_PTM-Core

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Perf. part: Support of single-cell point-to-multipoint transmission in LTE

LTE_SC_PTM-Perf

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See also:

GSA hails LTE Broadcast growth – 3GPP article November 2015

LTE Broadcast Test Specifications demonstrate Device Conformity - 3GPP news article July 2015

 

Contact for this article: Kevin FLYNN, Marketing and Communications Officer, 3GPP
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