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Impact of Relay Cooperation on the Performance of Large-Scale Multipair Two-Way Relay Networks

Sarajlic, Muris LU ; Liu, Liang LU orcid ; Rusek, Fredrik LU ; Sheikh, Farhana and Edfors, Ove LU orcid (2019) 2018 IEEE Global Communications Conference, GLOBECOM 2018
Abstract

We consider a multipair two-way relay communication network, where pairs of user devices exchange information via a relay system. The communication between users employs time division duplex, with all users transmitting simultaneously to relays in one time slot and relays sending the processed information to all users in the next time slot. The relay system consists of a large number of single antenna units that can form groups. Within each group, relays exchange channel state information (CSI), signals received in the uplink and signals intended for downlink transmission. On the other hand, per-group CSI and uplinkdownlink signals (data) are not exchanged between groups, which perform the data processing completely independently.... (More)

We consider a multipair two-way relay communication network, where pairs of user devices exchange information via a relay system. The communication between users employs time division duplex, with all users transmitting simultaneously to relays in one time slot and relays sending the processed information to all users in the next time slot. The relay system consists of a large number of single antenna units that can form groups. Within each group, relays exchange channel state information (CSI), signals received in the uplink and signals intended for downlink transmission. On the other hand, per-group CSI and uplinkdownlink signals (data) are not exchanged between groups, which perform the data processing completely independently. Assuming that the groups perform zero-forcing in both uplink and downlink, we derive a lower bound for the ergodic sumrate of the described system as a function of the relay group size. By close observation of this lower bound, it is concluded that the sumrate is essentially independent of group size when the group size is much larger than the number of user pairs. This indicates that a very large group of cooperating relays can be substituted by a number of smaller groups, without incurring any significant performance reduction. Moreover, this result implies that relay cooperation is more efficient (in terms of resources spent on cooperation) when several smaller relay groups are used in contrast to a single, large group.

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author
; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings
article number
8647760
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
conference name
2018 IEEE Global Communications Conference, GLOBECOM 2018
conference location
Abu Dhabi, United Arab Emirates
conference dates
2018-12-09 - 2018-12-13
external identifiers
  • scopus:85063499325
ISBN
9781538647271
DOI
10.1109/GLOCOM.2018.8647760
language
English
LU publication?
yes
id
83f60180-34b2-411a-8d3c-06ec21c3766c
date added to LUP
2019-04-08 12:18:18
date last changed
2024-03-03 00:10:52
@inproceedings{83f60180-34b2-411a-8d3c-06ec21c3766c,
  abstract     = {{<p>We consider a multipair two-way relay communication network, where pairs of user devices exchange information via a relay system. The communication between users employs time division duplex, with all users transmitting simultaneously to relays in one time slot and relays sending the processed information to all users in the next time slot. The relay system consists of a large number of single antenna units that can form groups. Within each group, relays exchange channel state information (CSI), signals received in the uplink and signals intended for downlink transmission. On the other hand, per-group CSI and uplinkdownlink signals (data) are not exchanged between groups, which perform the data processing completely independently. Assuming that the groups perform zero-forcing in both uplink and downlink, we derive a lower bound for the ergodic sumrate of the described system as a function of the relay group size. By close observation of this lower bound, it is concluded that the sumrate is essentially independent of group size when the group size is much larger than the number of user pairs. This indicates that a very large group of cooperating relays can be substituted by a number of smaller groups, without incurring any significant performance reduction. Moreover, this result implies that relay cooperation is more efficient (in terms of resources spent on cooperation) when several smaller relay groups are used in contrast to a single, large group.</p>}},
  author       = {{Sarajlic, Muris and Liu, Liang and Rusek, Fredrik and Sheikh, Farhana and Edfors, Ove}},
  booktitle    = {{2018 IEEE Global Communications Conference, GLOBECOM 2018 - Proceedings}},
  isbn         = {{9781538647271}},
  language     = {{eng}},
  month        = {{02}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  title        = {{Impact of Relay Cooperation on the Performance of Large-Scale Multipair Two-Way Relay Networks}},
  url          = {{http://dx.doi.org/10.1109/GLOCOM.2018.8647760}},
  doi          = {{10.1109/GLOCOM.2018.8647760}},
  year         = {{2019}},
}