Abstract
The extension of long term evolution (LTE) networks in unlicensed spectrum areas under the licensed assisted access concept aims at achieving higher transmission rates via the aggregation of the aforementioned bands along with the licensed ones within the 3G Partnership Project framework. A prospect carrier aggregation (CA) scheme should handle efficiently the coexistence of the LTE systems that compete for the same unlicensed spectrum areas along with their incumbent users (i.e., Wi-Fi). In this paper, a novel CA scheme is proposed for licensed/unlicensed MIMO LTE systems that allocates optimally the resources (power and resource blocks) of an evolved Node B to user equipments. Furthermore, the proposed approach handles the coexistence matters within the unlicensed bands with an efficient decentralized way. The new scheme involves the solution to a mixed integer nonlinear programming problem and thus, an optimal low complexity method is proposed based on the Lagrange dual decomposition. Furthermore, the proposed technique is extended to the imperfect channel state information (CSI) case. To that end, a novel listen-before-talk scheme is developed via which the required unlicensed bands CSI are estimated in a blind manner. The performance of all of the proposed techniques is verified via indicative simulations.
| Original language | English |
|---|---|
| Article number | 7937832 |
| Pages (from-to) | 3765-3779 |
| Number of pages | 15 |
| Journal | IEEE Transactions on Communications |
| Volume | 65 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 1 2017 |
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Keywords
- Carrier aggregation (CA)
- interference nulling
- licensed assisted access (LAA)
- listen-before-talk (LTB)
- resource allocation
ASJC Scopus subject areas
- Electrical and Electronic Engineering
Cite this
Resource Allocation for Licensed/Unlicensed Carrier Aggregation MIMO Systems. / Tsinos, Christos G.; Foukalas, Fotis; Tsiftsis, Theodoros A.
In: IEEE Transactions on Communications, Vol. 65, No. 9, 7937832, 01.09.2017, p. 3765-3779.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Resource Allocation for Licensed/Unlicensed Carrier Aggregation MIMO Systems
AU - Tsinos, Christos G.
AU - Foukalas, Fotis
AU - Tsiftsis, Theodoros A.
PY - 2017/9/1
Y1 - 2017/9/1
N2 - The extension of long term evolution (LTE) networks in unlicensed spectrum areas under the licensed assisted access concept aims at achieving higher transmission rates via the aggregation of the aforementioned bands along with the licensed ones within the 3G Partnership Project framework. A prospect carrier aggregation (CA) scheme should handle efficiently the coexistence of the LTE systems that compete for the same unlicensed spectrum areas along with their incumbent users (i.e., Wi-Fi). In this paper, a novel CA scheme is proposed for licensed/unlicensed MIMO LTE systems that allocates optimally the resources (power and resource blocks) of an evolved Node B to user equipments. Furthermore, the proposed approach handles the coexistence matters within the unlicensed bands with an efficient decentralized way. The new scheme involves the solution to a mixed integer nonlinear programming problem and thus, an optimal low complexity method is proposed based on the Lagrange dual decomposition. Furthermore, the proposed technique is extended to the imperfect channel state information (CSI) case. To that end, a novel listen-before-talk scheme is developed via which the required unlicensed bands CSI are estimated in a blind manner. The performance of all of the proposed techniques is verified via indicative simulations.
AB - The extension of long term evolution (LTE) networks in unlicensed spectrum areas under the licensed assisted access concept aims at achieving higher transmission rates via the aggregation of the aforementioned bands along with the licensed ones within the 3G Partnership Project framework. A prospect carrier aggregation (CA) scheme should handle efficiently the coexistence of the LTE systems that compete for the same unlicensed spectrum areas along with their incumbent users (i.e., Wi-Fi). In this paper, a novel CA scheme is proposed for licensed/unlicensed MIMO LTE systems that allocates optimally the resources (power and resource blocks) of an evolved Node B to user equipments. Furthermore, the proposed approach handles the coexistence matters within the unlicensed bands with an efficient decentralized way. The new scheme involves the solution to a mixed integer nonlinear programming problem and thus, an optimal low complexity method is proposed based on the Lagrange dual decomposition. Furthermore, the proposed technique is extended to the imperfect channel state information (CSI) case. To that end, a novel listen-before-talk scheme is developed via which the required unlicensed bands CSI are estimated in a blind manner. The performance of all of the proposed techniques is verified via indicative simulations.
KW - Carrier aggregation (CA)
KW - interference nulling
KW - licensed assisted access (LAA)
KW - listen-before-talk (LTB)
KW - resource allocation
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UR - http://www.scopus.com/inward/citedby.url?scp=85029912382&partnerID=8YFLogxK
U2 - 10.1109/TCOMM.2017.2710343
DO - 10.1109/TCOMM.2017.2710343
M3 - Article
VL - 65
SP - 3765
EP - 3779
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
SN - 0096-1965
IS - 9
M1 - 7937832
ER -