Latency-Limited Broadcast Channel With Cache-Equipped Helpers

被引:6
作者
Gherekhloo, Soheil [1 ]
Sezgin, Aydin [1 ]
机构
[1] Ruhr Univ Bochum, Inst Digital Commun Syst, D-44780 Bochum, Germany
关键词
Gaussian channels; braodcasting; caching; latency; lower bounds; upper bounds; CAPACITY REGION; ARCHITECTURE;
D O I
10.1109/TWC.2017.2693189
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Decreasing communication latency is one of the main challenges for many applications in future communication systems. As a solution, we study in this work the benefits of using some cache-equipped helpers in a wireless communication scenario. More precisely, a wireless network with a transmitter, two cache-equipped helpers, and two receivers is studied from the latency point of view. While the transmitter has access to the whole data, the helpers store some data in their cache in order to support the transmitter in fulfilling the demands of the receivers. The main challenge is to develop a joint caching placement and the transmission strategy, which minimizes the latency of the communication. To this end, a general encoded caching is considered, in which each message is split into four types of sub-messages. The sub-messages of the first and second types are stored only in the cache of the first and second helper, respectively. The sub-messages of the third type are cached at both helpers, while the sub-messages of the fourth type are not cached at any helper. The size of the sub-messages is optimized in a way such that the delivery time of one bit for the worst-case demand is minimized. Moreover, a general lower bound on the delivery time is provided. Using this lower bound as a benchmark, the performance of the proposed caching policy is evaluated. It is shown that facilitating the cache-equipped helpers decreases the latency of broadcasting. Furthermore, it is shown that for the proposed caching policy, storing identical sub-messages in the cache of different helpers cannot be optimal if the cache size of the helpers is insufficiently large.
引用
收藏
页码:4192 / 4203
页数:12
相关论文
共 27 条
[1]  
[Anonymous], 2016, WSA 2016 20 INT ITG
[2]  
Bassi G, 2014, IEEE INT SYMP INFO, P1421, DOI 10.1109/ISIT.2014.6875067
[3]   On the Generalized Degrees of Freedom of the Gaussian Interference Relay Channel [J].
Chaaban, Anas ;
Sezgin, Aydin .
IEEE TRANSACTIONS ON INFORMATION THEORY, 2012, 58 (07) :4432-4461
[4]   An Alternative Proof for the Capacity Region of the Degraded Gaussian MIMO Broadcast Channel [J].
Ekrem, Ersen ;
Ulukus, Sennur .
IEEE TRANSACTIONS ON INFORMATION THEORY, 2012, 58 (04) :2427-2433
[5]  
Ge XH, 2016, IEEE WIREL COMMUN, V23, P72, DOI 10.1109/MWC.2016.7422408
[6]   5G Wireless Backhaul Networks: Challenges and Research Advances [J].
Ge, Xiaohu ;
Cheng, Hui ;
Guizani, Mohsen ;
Han, Tao .
IEEE NETWORK, 2014, 28 (06) :6-11
[7]   Cooperation for Interference Management: A GDoF Perspective [J].
Gherekhloo, Soheil ;
Chaaban, Anas ;
Sezgin, Aydin .
IEEE TRANSACTIONS ON INFORMATION THEORY, 2016, 62 (12) :6986-7029
[8]   Femtocaching and Device-to-Device Collaboration: A New Architecture for Wireless Video Distribution [J].
Golrezaei, Negin ;
Molisch, Andreas F. ;
Dimakis, Alexandros G. ;
Caire, Giuseppe .
IEEE COMMUNICATIONS MAGAZINE, 2013, 51 (04) :142-149
[9]   A Survey of 5G Network: Architecture and Emerging Technologies [J].
Gupta, Akhil ;
Jha, Rakesh Kumar .
IEEE ACCESS, 2015, 3 :1206-1232
[10]  
Maddah-Ali MA, 2015, IEEE INT SYMP INFO, P809, DOI 10.1109/ISIT.2015.7282567