Self-adaption multiple-relay selection method in terminal through communication system

A terminal direct communication and adaptive technology, applied in wireless communication, radio relay system, sustainable communication technology and other directions, can solve the problems of poor service reliability of edge users, and achieve the effect of improving performance and resource optimization.

Active Publication Date: 2014-04-09
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

But like the problem encountered in cellular networks (poor reliabili

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  • Self-adaption multiple-relay selection method in terminal through communication system
  • Self-adaption multiple-relay selection method in terminal through communication system
  • Self-adaption multiple-relay selection method in terminal through communication system

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Embodiment Construction

[0040]The present invention considers that there are N idle users in a single scenario (N idle users can be used as potential relays), a pair of D2D users (assuming that the sending end is S, and the receiving end is D), and M cellular users (they resources can be reused by D2D users). System model such as figure 1 shown. D2D users can multiplex uplink resources and also multiplex downlink resources. Table 1 lists the different interference scenarios.

[0041] Interference modeling for D2D network relay communication:

[0042] (1) Multiplexing cellular uplink resources

[0043] When D2D relay users are introduced to reuse the cellular uplink resources of the cell, the interference between the two communication technologies includes two aspects, namely the interference of the cellular link to the D2D link and the interference of the D2D link to the cellular link. In the first hop time slot, S sends a signal to R, R will be interfered by the uplink signal of cellular user ...

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Abstract

The invention discloses a self-adaption multiple-relay selection method in a terminal through communication system. The method comprises the steps that the received signal to noise ratio of a destination node D is estimated; whether introducing relays is necessary is judged; the interference of each relay on a base station is calculated; according to priority, ordering is carried out on all relays; according to relay ordering, the relays are taken out in turn; whether the relays are optional relays is judged, so as to acquire an optional relay set. According to the method provided by the invention, several relay selection schemes in a D2D communication system are provided to adapt to different system environment requirements; collision probability optimization is carried out; and the D2D communication system can achieve the best performance on the basis that cellular communication is not affected.

Description

technical field [0001] The invention belongs to the relay communication field and relates to a relay selection method. Background technique [0002] In recent years, with the rapid development of mobile communication, the bandwidth below 5G is already very crowded, and the reuse of frequency band resources is particularly urgent. On the basis of the cellular network, the introduction of D2D (Device-to-Device) communication can increase the utilization of frequency band resources and reduce the load of the base station. However, similar problems exist in D2D communication as in cellular networks (poor reliability of edge user services). Therefore, the relay can be added to the D2D communication to improve the coverage of the D2D communication and obtain more stable services. There are many idle mobile terminals in a cellular network, which terminals are selected as relays is related to the performance of the entire system, and different relay selection strategies have their...

Claims

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Application Information

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IPC IPC(8): H04W40/22H04W76/02H04W8/14H04B7/14H04W72/04
CPCY02D30/70
Inventor 邵世祥夏伟成孙君
Owner NANJING UNIV OF POSTS & TELECOMM
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