moma: a novel multiple access technique accomodating...

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Stefano TOMASIN Joint Work with M. Debbah and N. Ksairi

MOMA: a novel multiple access technique

accomodating differentiated sevices for 5g systems


Background

Objective: Support for Internet-of-Things (IoT) in next-generation

networks Wearable electronics, smart meters, sensors … Need for radio access enabling massive

machine-to-machine (M2M) connections

Existing solutions: LoRa: Narrow band (NB) FDMA + chirp spread spectrum

SIGFOX: Ultra NB (UNB) FDMA Both on unlicensed frequencies new network and hardware deployment

LTE-M

M2M devices differ from handheld devices and among

themselves in Device constraints Traffic patterns and quality-of-service (QoS) requirements


Motivation for MOMA

Lack of support for multi-class devices/services: Beyond low-energy, low-data-rate devices There will be multiple classes of IoT servicesin addition to the mobile-broadband/IoT divide

Inefficiency in resource utilization Orthogonal MA available BW in NB cellular IoT solutions is

underused Limited resource management flexibility

Only 1 parameter to control broadband/IoT resource planning (the BW)

This parameter is fixed in advance in most existing solutions


Multi-Service Oriented Multiple Access (MOMA) MOMA: integrating both traditional broadband

users and massive machine-to-machine (M2M)

connections by establishing separate classes of users and/or services Class dependent hierarchical spreading of the data

signal a mix of multiuser and single-user detection at the BS


Multi-Service Oriented Multiple Access (MOMA) What we mean by a class of devices/services:

Class: A group of users with the same QoS profile and user density

User: a device or a specific service running on a device Example: a smart watch monitoring health and a social

texting app running on a smartphone could in principle belong to the same class

Example of a system with classes A class requiring a data rate as high as possible for a

relatively small number of users classes of decreasing target rates each requiring to

accommodate as many users as possible


MOMA Principle

MOMA principle (L classes)

Lowest-target-rate users

Broadband users

More overloading

Code-domainorthogonality


MOMA Principle


MIMO MOMA

“For any fixed number of antennas, the limiting performance of the -spread system with the MMSE receiver as →∞ with → is the same as that for a system with a single antenna, having processing gain and with the received power of each user the sum of the received powers at the individual antennas.”

Multi-antenna BS: Effect on MOMA?

S. V. Hanly and D. Tse, “Resource Pooling and Effective Bandwidths in CDMA Networks with Multiuser Receivers and Spatial Diversity,” IEEE Trans. Inf. Theory,

2001


MIMO MOMA


Performance of MIMO MOMA



Multiplexing capability of LD users


MOMA on Massive MIMO

Channel hardening


MOMA on Massive MIMO

Effect on intra-HD-class and inter-class orthogonality?


Performance of MOMA on Massive MIMO



Multiplexing capability of LD users



Almost perfect inter-class and intra-HD-class orthogonality: Even with

single-user detection

Less dependence on the channel time-frequency variation profile


MOMA for LTE Evolution

MOMA implementation on a narrow bandwidth


Symbol Mapping for MOMA

MOMA implementation on a narrow bandwidth


MOMA Performance on the LTE-M Bandwidth Bundling-off performance


Conclusions

MOMA allows a flexible trade-off between rate and availability

MOMA fits well with MIMO

MOMA can be applied as an extension of LTE systems

moma: a novel multiple access technique accomodating...

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