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Jul 18, 2023 273 likes •460 views

Software Radio Implementation of Signaling Splitting in Hyper-Cellular Network Tao Zhao, Pengkun Yang, Huimin Pan, Ruichen Deng, Sheng Zhou, Zhisheng Niu Network Integration for Ubiquitous Linkage and Broadband(NiuLab) Tsinghua University,

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Software Radio Implementation of Signaling Splitting in Hyper-Cellular Network

Tao Zhao, Pengkun Yang, Huimin Pan, Ruichen Deng, Sheng Zhou, Zhisheng Niu

Network Integration for Ubiquitous Linkage and Broadband(NiuLab) Tsinghua University, Beijing, China

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SLIDE 2

Outline

1

Introduction to Hyper-Cellular Network

2

Signaling Splitting in Current Protocols

3

Software Defined Radio Implementation

4

Summary

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SLIDE 3

Outline

1

Introduction to Hyper-Cellular Network

2

Signaling Splitting in Current Protocols

3

Software Defined Radio Implementation

4

Summary

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SLIDE 4

Current Cellular Networks

Exponential growth of traffic demand Smaller cell size & denser base station deployment Challenges:

Energy consumption: BS sleeping → coverage holes Inter-cell interference: CoMP → lack of global info Frequent handovers: signaling overhead Conventional cellular network

Coupling of signaling and data renders the system inefficient!

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SLIDE 5

Hyper-Cellular Network Architecture

Control data separation (Signaling splitting) Signaling base station (SBS) & data base station (DBS) Benefits

Green with DBS sleeping SBS holds global information for CoMP Handover only necessary when switching SBS

GREEN: Globally Resource-optimized & Energy-Efficient NW

Hyper-cellular network[1]

[1] Z. Niu et al. “Energy efficiency and resource optimized hyper-cellular mobile communication system architecture

and its technical challenges”. In: SCIENTIA SINICA Informationis 42.10 (2012). In Chinese, pp. 1191–1203. doi: 10.1360/112012-433. 5 / 18

SLIDE 6

Service Flow in HCN

MU associates to Signaling BS. MU requests for traffic channel, Signaling BS assigns a Data BS and informs MU. Traffic data transmission is estab- lished between MU and Data BS.

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SLIDE 7

Outline

1

Introduction to Hyper-Cellular Network

2

Signaling Splitting in Current Protocols

3

Software Defined Radio Implementation

4

Summary

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SLIDE 8

Challenges & Approach

Why current protocols?

Step from design to practice: feasibility of separation Migration of networks Future protocol design

Challenges

Millions of signals, difficult to categorize Complicated signal interactions, difficult to separate Seamless UE experience, difficult to guarantee

Solution: separate by network functionalities

Signaling BS: synchronization, broadcast of system information, paging, low speed data transmission Data BS: synchronization, high speed data transmission

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SLIDE 9

Mapping

State-functionality mapping Functionality-signal mapping

State-functionality mapping[2]

State

UE Activities Network Functionalities Syn. Broadcast of System Information Paging Multicast Unicast Detached Cell Selection √ √ Idle Acquisition and Update of System Configuration √ √ Monitoring of Upcoming Transmission Notification √ Cell Reselection √ √ Receiving of MBMS √ Active Acquisition and Update of System Configuration. √ √ Monitoring of Upcoming Transmission Notification √ Cell Handover √ √ √ Receiving of MBMS √ Transmission of UE-Specific Data √

[2] X. Xu et al. “On Functionality Separation for Green Mobile Networks: Concept Study over LTE”. . In: IEEE

Communications Magazine 51.5 (2013), pp. 82–90. issn: 0163-6804. doi: 10.1109/MCOM.2013.6515050. 9 / 18

SLIDE 10

Channel Separation

Channel separation scheme for 3GPP standards:

3GPP Standard GSM/GPRS UMTS R99 LTE R8 SBS BCCH, PCH, AGCH, RACH, PBCCH, PPCH, PAGCH, PRACH S-CCPCH, P-CCPCH, MICH PBCH, PMCH, PRACH DBS PDTCH DPDCH – Both SCH, FCCH, TCH, SACCH, SDCCH, FACCH, PDCCH SCH, CPICH, DPCCH, S-CCPCH PSS, SSS, PDSCH, PCFICH, PHICH, PDCCH, PUCCH, PUSCH

Implementation for GSM/GPRS protocol

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SLIDE 11

Outline

1

Introduction to Hyper-Cellular Network

2

Signaling Splitting in Current Protocols

3

Software Defined Radio Implementation

4

Summary

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SLIDE 12

Platform

Hardware:

Commodity PC USRP N210 Gigabit Ethernet Switch Mobile phone

Software:

OpenBTS

smocom

Asterisk

Switch Data BS Signaling BS Data BS Data Traffic Control Signaling MU1 MU2 SBS RF DBS RF DBS RF OpenBTS PCU SGSN GGSN Internet

SDR platform

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SLIDE 13

Main Work

SBS DBS communication

UDP sockets Payload: channel description

Synchronization

Frequency: MIMO cable; GPSDO Time slot: wakeup; correlation

Simplified DBS

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SLIDE 14

Progress

Phone call separation GPRS data separation

Platform setup SBS log DBS log

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SLIDE 15

Vision

Hyper-cellular network testbed

Typical work flow BS scheduling Performance evaluation . . .

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SLIDE 16

Outline

1

Introduction to Hyper-Cellular Network

2

Signaling Splitting in Current Protocols

3

Software Defined Radio Implementation

4

Summary

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SLIDE 17

Summary

Hyper-cellular network enables GREEN network

perations for cellular networks.

Functionality separation approach to achieve signaling splitting Working system on software defined radio platform

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