WO2014181175A1

WO2014181175A1 - Methods, apparatuses, and system for determining communication resources for a d2d pair

Info

Publication number: WO2014181175A1
Application number: PCT/IB2014/000947
Authority: WO
Inventors: Kai Yang; Yong Liu; Yun DENG; Liyu Cai; Chongxian Zhong
Original assignee: Alcatel Lucent
Priority date: 2013-05-10
Filing date: 2014-05-05
Publication date: 2014-11-13
Also published as: TW201509223A; CN104144507A; CN104144507B

Abstract

An objective of the present invention is providing a method, apparatus, and system for determining a communication resource of a D2D pair. The method according to the present invention comprises: obtaining first related information corresponding to the D2D pair, second related information corresponding to the to-be-selected device, and third related information corresponding to the base station; deciding whether the D2D pair fulfills a predetermined condition based on the first, second and third related information in conjunction with a first SINR threshold corresponding to a receiving side of the D2D pair and a second SINR threshold corresponding to the base station; if the D2D pair fulfills the predetermined condition, selecting a communication resource of the to-be-selected device and allocate it to the D2D pair for performing a D2D communication. The technical solution according to the present invention can simultaneously guarantee the communication quality of the cellular user equipment and the communication quality of the D2D pair.

Description

Methods, Apparatuses, and System for Determining Communication

Resources for a D2D Pair

FIELD OF THE INVENTION

The present invention relates to the field of communication technologies, and more specifically, to methods, apparatuses and system for determining communication resources for a D2D pair.

DETAILED DESCRIPTION OF THE INVENTION

Since a D2D (Device-to-Device) technology can effectively enhance system spectrum efficiency and reduce power consumption of UEs in the D2D Pair (Device-to-Device Pair), it attracts more and more attention. In a network supporting the D2D technology, radio resources can be simultaneously used by cellular user equipment and the D2D pair; thereby the system resources can be compactly multiplexed. However, compared with downlink, uplink has not been sufficiently utilized yet. Therefore, most researches regarding D2D transfer focus on how the D2D pair can multiplex the uplink spectrum of an LTE system.

In the mode of sharing uplink resources, particularly when the D2D pair is relatively close to a base station, the base station may be subject to great interference from a transmitting side of the D2D pair.

Some existing technical solutions for solving this problem mainly restrict the transmitting power of the transmitting side of the D2D pair, based on the interference situation between the D2D pair and cellular user equipment, so as to reduce the interference of its transmitting side with the base station. However, since the cellular user equipment would also interference with the transmitting side of the D2D pair simultaneously, such a scheme cannot solve this issue better within an enough short time, e.g., within couples of milliseconds.

SUMMARY OF THE INVENTION

An objective of the present invention is providing a method, apparatus, and system for determining a communication resource of a D2D pair.

According to one aspect of the present invention, there is provided a method of determining a communication resource for a D2D pair in a base station, wherein the said base station corresponds to at least one cellular user equipment, wherein for a to-be-selected device among the said at least one cellular user equipment, the said method comprising: a. obtaining first related information corresponding to the said D2D pair, second related information corresponding to the said to-be-selected device, and third related information corresponding to the said base station; b. deciding whether said D2D pair fulfills a predetermined condition based on the said first, second and third related information in conjunction with a first SINR threshold corresponding to a receiving side of the said D2D pair and a second SINR threshold corresponding to the said base station; c. if the said D2D pair fulfills the predetermined condition, selecting a communication resource of the said to-be-selected device and allocating it to the said D2D pair to perform a D2D communication. According to one aspect of the present invention, there is provided a base station for determining a communication resource for a D2D pair, wherein the said base station corresponds to at least one cellular user equipment, wherein the said base station comprises the following devices to perform operations on a to-be-selected device among the said at least one cellular user equipment: a first obtaining device, configured to obtain first related information corresponding to the said D2D pair, second related information corresponding to the said to-be-selected device, and third related information corresponding to the said base station; a deciding device, configured to decide whether the said D2D pair fulfills a predetermined condition based on the said first, second and third related information in conjunction with a first SINR threshold corresponding to a receiving side of the said D2D pair and a second SINR threshold corresponding to the said base station; a first determining device, configured to, if the D2D pair fulfills the predetermined condition, select a communication resource of the said to-be-selected device and allocate it to the D2D pair to perform a D2D communication.

According to one aspect of the present invention, there is provided a communication system, wherein said communication system comprises said base station, the at least one cellular user equipment corresponding to the said base station, and at least one D2D pair.

Compared with the prior art, the present invention has the following advantages: according to the technical solution of the present invention, by deciding whether allocation of communication resources to a D2D pair will cause too much interference to the eNB or not, an appropriate communication resource is allocated to the D2D pair in the case of a certain signal to interference plus noise ratio (SINR) has been fulfilled, thereby guaranteeing the communication quality of the cellular user equipment and the communication quality of the D2D pair simultaneously.

BRIEF DESCRIPTION OF THE DRAWING

Other features, objectives and advantages of the present invention will become more apparent through reading the detailed description of the non-limitative embodiments with reference to the accompanying drawings below:

Fig. 1 schematically shows a communication system according to the present invention;

Fig. 2 schematically shows a flowchart of a method for determining a communication resource for a D2D pair according to the present invention;

Fig. 3 shows a structural diagram of a communication system for determining a communication resource for a D2D pair according to the present invention.

Like or similar reference documents in the drawing represent same or similar components.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a communication system. The said communication system may support D2D communication. Herein, the communication system according to present invention comprises at least one base station, at least one cellular user equipment corresponding to the base station, and at least one D2D pair.

Herein, the communication system includes, but not limited to, a 3 GPP LTE-based wireless communication system. Herein, the base station includes, but not limited to, BS, e-NodeB, home base station, macro base station, etc. The cellular user equipment includes an electronic device capable of directly or indirectly communicating with the base station in a wireless manner, including, but not limited to, a cellular phone, a PDA, etc. The D2D pair comprises two paired devices between which a communication link is established using a D2D communication technology, so as to directly perform communication between two paired devices through multiplexing the communication resources of a corresponding cellular communication link.

The D2D pair comprises a transmitting side and a receiving side; in a D2D pair only supporting one-way communication, the transmitting side and the receiving side may be located in two user equipment, separately, while in a D2D pair supporting two-way communication, each user equipment comprises a transmitting side and a receiving side.

Note that those skilled in the art would appreciate the communication system, base station, and user equipment are not limited to the indicated, and any system, base station, and user equipment applicable to the present invention should be covered within the protection scope of the present invention.

Fig. 2 schematically illustrates a flowchart of a method for determining a communication resource of a D2D pair. The method according to the present invention comprises step S21 performed by the D2D pair, steps Sll, S12, and S13 performed by the base station.

Herein, according to the method of the present invention, the base station selects a to-be-selected device from among its corresponding at least one cellular user equipment, and performs steps Sll to S13 based on the to-be-selected device.

Herein, the base station selects one from among the at least one cellular user equipment as the to-be-selected device based on a predetermined selection policy.

Preferably, the base station selects a predetermined number of cellular user equipment from among its corresponding at least one cellular user equipment based on a predetermined selection policy, and selects one to-be-selected device from among the predetermined number of cellular user equipment.

In step S21, the D2D transmits, to the base station, first related information of the D2D link between the D2D pair.

Preferably, the D2D pair transmits, to the base station, the first related information of the D2D link between the D2D pair through a receiving side or a transmitting side.

Herein, the first related information includes: 1) first fading information of the D2D link between the D2D pair, the said first fading information is used for indicating power fading situation from the transmitting side to the receiving side; 2) first interference-noise information of the receiving side in the D2D pair, the said first interference-noise is used for indicating noise and interference power related information of the receiving side.

Preferably, the first interference-noise information includes first noise power and first interference power of the receiving side.

More preferably, if the D2D pair detects that the first interference power is far greater than the first noise power, the D2D pair only reports the first interference power to the base station; similarly, if the D2D pair detects that the first noise power is far greater than the first interference power, the D2D pair only reports the first noise power to the base station.

Preferably, according to the method of the present invention, by inserting a reference channel in the D2D link, the first fading information included in the first related information is measured. More preferably, the reference channel is also applicable to demodulation of the D2D link. For example, a DMRS (Demodulation Reference Signals) of a similar LTE system is inserted into the D2D link so as to measure the first fading information and perform a demodulation operation on the D2D link.

Next, in step Sll, the base station obtains the first related information corresponding to the D2D pair, the second related information corresponding to the to-be-selected device, and the third related information corresponding to the base station.

Herein, the first related information has been explained in above step S21, which will not be detailed here.

Herein, the second related information comprises: 1) second fading information between the to-be-selected device and the base station, the said second fading information is used for indicating power fading situation from the to-be-selected device to the base station; 2) first transmitting power of the to-be-selected device.

Herein, the third related information includes: 1) third fading information between the base station and the transmitting side of the D2D pair, wherein the said third fading information is used for indicating power fading situation from the transmitting side to the base station; 2) second interference-noise information of the base station, the said second interference-noise information is used for indicating relevant information about the noise and inter-cell interference power of the base station.

Herein, the base station obtains various information included in the first, second, and third related information in various ways.

Preferably, the base station receives the first related information reported by the receiving side of the D2D pair, and the first transmitting power reported by the to-be-selected device, respectively.

Preferably, the base station determines the second fading information corresponding to the to-be-selected device by measuring the uplink SRS (Sounding Reference Signal) or uplink DMRS corresponding to the to-be-selected device.

Preferably, the base station obtains, through measurement, the third fading information between itself and the transmitting side of the D2D pair and its own second interference-noise information.

Next, in step S12, the base station decides whether the D2D pair fulfills a predetermined condition based on the first, second, and third related information in conjunction with a first signal to interference plus noise ratio(SINR) threshold corresponding to the receiving side of the D2D pair and a second SINR threshold corresponding to the base station.

Herein, the first signal to interference plus noise threshold is determined based on the QoS (Quality of Service) of the D2D link of the D2D pair. Preferably, different QoS requests correspond to different first SINR thresholds, respectively.

Herein, the second SINR threshold is determined based on the QoS information of the cellular link between the to-be- selected device and the base station. Preferably, different QoS requests correspond to different second SINR thresholds, respectively.

Herein, those skilled in the art may obtain the manner of determining the corresponding SINR threshold based on the QoS according to the actual condition and need, which will not be detailed here.

Herein, the implementation of step S12 includes any one of the following: (1) the first fading information includes first channel fading between the transmitting side and the receiving side, the third fading information includes third channel fading between the transmitting side and the base station, the first interference-noise information includes first noise power and first interference power, the second interference-noise information includes second noise power and second interference power, wherein the predetermined condition includes the following inequation:

¹ P cuE h'r Ic +^oc ( l ) ;

Dth wherein ^hcD denotes the third channel fading, ^ denotes the first channel fading, ^^Dth denotes the first SINR threshold, ^cuE denotes the first transmitting power, ^hc denotes the second channel fading; ^^cth denotes the second SINR threshold, ^Id denotes the first interference power, ^^0D denotes the first noise power, ^Ic denotes the second interference power, and ^^oc denotes the second noise power.

Specifically, the base station decides whether the values of respective items of information obtained in step Sll fulfill the inequation (1), and when the inequation(l) is fulfilled, determines that the D2D pair fulfills the predetermined condition.

2) the first fading information includes a first path distance of the D2D link and a corresponding first path fading index; the third fading information includes a second path distance between the transmitting side and the base station and a corresponding second path fading index, the first interference-noise information includes a first noise power and a first interference power, the second interference-noise information includes a second noise power and a second interference power, wherein the predetermined condition includes the following inequation:

d > p ·

Tct I ⁺^ J J wherein ^dcD denotes the second path distance, ^ denotes the second path fading index, ^d° denotes the first path distance, ^a denotes the first path fading index, ^^Dth denotes the first SINR threshold, ^cuE denotes the first transmitting power, ^hc denotes the second channel fading; ^^cth denotes the second SINR threshold, ^Id denotes the first interference power, ^^0D denotes the first noise power, ^Ic denotes the second interference power, and ^^oc denotes the second noise power.

Specifically, the base station decides whether the values of respective items of information obtained in step Sll fulfill the inequation (2), and when the inequation (2) is fulfilled, determines that the D2D pair fulfills the predetermined condition.

According to one preferred embodiment of the present invention, the said predetermined condition includes that the first SINR of the D2D receiving side fulfills the first SINR threshold, and the second SINR of the base station fulfills the second SINR threshold, wherein the method according to the present invention further comprises step S14 (not shown), the step S12 further comprises step S121 (not shown) and step SI 22 (not shown).

In step S14, the base station obtains second transmitting power of the transmitting side relative to the base station. In step SI 21, the base station determines the first SINR based on the obtained first related information and the D2D transmitting power information, and determines the second SINR based on the second related information, the third related information, and the D2D transmitting power information.

According to a preferred solution of the present embodiment, the predetermined condition includes " ^^Drx≥ ^^Dth and ^^eNB≥ ^^cth ," wherein the ^^Dth denotes the first SINR threshold, ^^Qh denotes the second SINR threshold, ? Drx denotes the first SINR of the receiving side of the D2D pair, and ^^eNB denotes the second SINR of the base station.

Herein, the base station determines the first SINR according following equation (3):

^ Dt ^D

Wherein °^tx denotes the second transmitting power, ^ denotes the first channel fading, ^Id denotes the first interference power, and ^^0D denotes the first noise power.

And the base station determines the second SINR based on the following equation (4):

_V _ ^CUE^C ( A ) ·

I eNB p , 1 AT '

Dtx "CD ^""^"C ⁺ OC

Wherein ^cuE denotes the first transmitting power, ^hc denotes the second channel fading, ^ax denotes the second transmitting power, ^CD denotes the third channel fading, ^Ic denotes the second interference power, and ^^oc denotes the second noise power.

Next, in step S122, the base station decides whether the first SINR and the second SINR fulfill the predetermined condition based on the first SINR threshold and the second SINR threshold.

Preferably, the base station decides whether the predetermined condition " ^≥ ^^Dth and ^^eNB≥ ^^cth " are reasonable for the values of ^^Drx and ^^eNB that have been obtained in step S121 and the values of ^^Dth and ^^cth that have been determined by the base station.

Next, in step S13, if the D2D pair fulfills the predetermined condition, the base station selects the communication resource of the to-be-selected device to allocate to the D2D pair for it to perform D2D communication.

As one of the preferred embodiments of the present invention, the method according to the present invention further comprises step S15 (not shown).

In step S15, if the D2D pair does not fulfill the predetermined condition, the base station performs a corresponding processing to the D2D pair, wherein the corresponding processing including any one of the following:

1) selecting another cellular user equipment from among the at least one cellular user equipment as the to-be-selected device.

For example, the base station selects a not-to-be-selected-yet cellular user equipment from among the at least one cellular user equipment as a new to-be-selected device, and further determines whether the D2D pair fulfills the predetermined condition relative to the new to-be-selected device through step S21 performed by the D2D pair and steps SI 1 to SI 3 performed by the base station.

2) not allocating the communication resource to the D2D pair within the current timeslot.

It should be noted that any method of deciding, based on the transformations of the above various equations, e.g., any alteration performed to inequations (1) or (2), or any kinds of varied conditions derived based on the predetermined condition " ^≥ ^^Dth and ^^eNB≥ ^^cth " and the above equations (3) and (4), should be covered within the invention scope of the present invention.

As one preferred embodiment of the present invention, if the D2D pair supports two-way communication, the base station needs to obtain relevant parameters of the transmitting side and the receiving side in two communication directions, respectively, to perform the operations of aforementioned steps Sl l to SI 3, respectively, so as to decide whether the D2D pair fulfills the predetermined condition in two directions, respectively, and when and only when both of the transmitting side and the receiving side in two communication directions fulfill the predetermined condition, the communication resource of the to-be-selected device is allocated to the D2D pair for it to perform communication.

The method according to the present invention, before allocating a communication resource to the D2D pair, detects the interference of the D2D pair with the base station and the interference from the cellular user equipment to the D2D pair, and only when the D2D pair fulfills a corresponding SINR ratio, the D2D pair is allowed to use the communication resource of the to-be-selected device for communication, thereby it can guarantee the corresponding QoS of the cellular link and the QoS of the D2D link of the D2D pair.

Fig. 3 schematically shows a structural diagram of a communication system for determining a communication resource for a D2D pair. The system according to the present invention comprises a base station, a D2D pair, and a to-be-selected device corresponding to the base station.

Herein, said D2D pair includes a transmitting device 21, said base station includes a first obtaining device 11, a deciding device 12 and a first determining device 13.

Herein, according to the scheme of the present invention, the base station selects a to-be-selected device from among its corresponding at least one cellular user equipment, and the first obtaining device 11, the deciding device 12 and the first determining device 13 perform corresponding operations based on the to-be-selected device.

The transmitting device 21 of the D2D pair transmits, to the base station, first related information of the D2D link between the D2D pair.

Preferably, the transmitting device 21 is included in a receiving side or a transmitting side of the D2D pair.

More preferably, if the D2D pair detects that the first interference power is far greater than the first noise power, the transmitting device 21 only reports the first interference power to the base station; similarly, if the D2D pair detects that the first noise power is far greater than the first interference power, the transmitting device 21 only reports the first noise power to the base station.

Preferably, according to the approach of the present invention, by inserting a reference channel in the D2D link, the first fading information included in the first related information is measured. More preferably, the reference channel is also applicable to demodulation of the D2D link. For example, a DMRS (Demodulation Reference Signals) of a similar LTE system is inserted into the D2D link so as to measure the first fading information and perform a demodulation operation on the D2D link.

Next, the first obtaining device 11 of the base station obtains the first related information corresponding to the D2D pair, the second related information corresponding to the to-be-selected device, and the third related information corresponding to the base station.

Herein, the first related information has been explained in above transmitting device 21, which will not be detailed here.

Herein, the first obtaining device 11 obtains various information included in the first, second, and third related information in various ways. Preferably, the first obtaining device 11 receive the first related information reported by the receiving side of the D2D pair, and the first transmitting power reported by the to-be-selected device, respectively.

Preferably, the first obtaining device 11 determines the second fading information corresponding to the to-be-selected device by measuring the uplink SRS (Sounding Reference Signal) or uplink DMRS corresponding to the to-be-selected device.

Preferably, the first obtaining device 11 obtains, through measurement, the third fading information between itself and the transmitting side of the D2D pair and its own second interference-noise information.

Next, the deciding device 12 of the base station decides whether the D2D pair fulfills a predetermined condition based on the first, second, and third related information in conjunction with a first signal to interference plus noise ratio(SINR) threshold corresponding to the receiving side of the D2D pair and a second SINR threshold corresponding to the base station.

Herein, the second SINR threshold is determined based on the QoS information of the cellular link between the to-be- selected device and the base station. Preferably, different QoS requests correspond to different second SINR thresholds, respectively. Herein, those skilled in the art may obtain the manner of determining the corresponding SINR threshold based on the QoS according to the actual condition and need, which will not be detailed here.

Herein, the implementation of the deciding device 12 includes any one of the following:

1) the first fading information includes first channel fading between the transmitting side and the receiving side, the third fading information includes third channel fading between the transmitting side and the base station, the first interference-noise information includes first noise power and first interference power, the second interference-noise information includes second noise power and second interference power, wherein the predetermined condition includes the following inequation:

wherein ^hcD denotes the third channel fading, ^ denotes the first channel fading, ^^Dth denotes the first SINR threshold, ^cuE denotes the first transmitting power, ^hc denotes the second channel fading; ^^cth denotes the second SINR threshold, ^Id denotes the first interference power, ^^0D denotes the first noise power, ^Ic denotes the second interference power, and ^^oc denotes the second noise power.

Specifically, the deciding device 12 decides whether the values of respective items of information obtained by the first obtaining device fulfill inequation (1), and if the inequation (1) is fulfilled, determines that the D2D pair fulfills the predetermined condition. 2) the first fading information includes a first path distance of the D2D link and a corresponding first path fading index; the third fading information includes a second path distance between the transmitting side and the base station and a corresponding second path fading index, the first interference-noise information includes a first noise power and a first interference power, the second interference-noise information includes a second noise power and a second interference power, wherein the predetermined condition includes the following inequation:

d >

⁺^ J J wherein ^dcD denotes the second path distance, ^ denotes the second path fading index, ^d° denotes the first path distance, ^a denotes the first path fading index, ^^Dth denotes the first SINR threshold, ^cuE denotes the first transmitting power, ^hc denotes the second channel fading; ^^cth denotes the second SINR threshold, ^Id denotes the first interference power, ^^0D denotes the first noise power, ^Ic denotes the second interference power, and ^^oc denotes the second noise power.

Specifically, the deciding device 12 decides whether the values of respective items of information obtained by the first obtaining device 11 fulfill the inequation (2), and if the inequation (2) is fulfilled, determines that the D2D pair fulfills the predetermined condition.

According to one preferred embodiment of the present invention, the said predetermined condition includes that the first SINR of the D2D receiving side fulfills the first SINR threshold, and the second SINR of the base station fulfills the second SINR threshold, wherein the base station according to the present invention further comprises a second obtaining device(not shown), the deciding device 12 further comprises a second determining device (not shown) and a sub-deciding device (not shown).

The second obtaining device obtains second transmitting power of the transmitting side relative to the base station.

The second determining device determines the first SINR based on the obtained first related information and the D2D transmitting power information, and determines the second SINR based on the second related information, the third related information, and the D2D transmitting power information.

Herein, the second determining device determines the first SINR according to the following equation (3):

^ Dt ^D

And the second determining device determines the second SINR based on the following equation (4).

„ _ ^rcvEⁿc ( A ) ·

I eNB p , 1 AT '

Dtx "CD ^""^"C ⁺ OC

Wherein ^cuE denotes the first transmitting power, ^hc denotes the second channel fading, ^p^ denotes the second transmitting power, ^hcD denotes the third channel fading, ^Ic denotes the second interference power, and ^^oc denotes the second noise power.

Next, the sub-deciding device decides whether the first SINR and the second SINR fulfill the predetermined condition based on the first SINR threshold and the second SINR threshold.

Preferably, the sub-deciding device decides whether the predetermined condition " ^≥ ^^Dth and ^^eNB≥ ^^cth " are reasonable for the values of ^^Drx and ^^eNB that have been obtained by the second determining device and the values of ^^Dth and ^^cth that have been determined by the base station.

Next, if the D2D pair fulfills the predetermined condition, the first determining device 13 of the base station selects the communication resource of the to-be-selected device to allocate to the D2D pair for it to perform D2D communication.

As one of the preferred embodiments of the present invention, the base station according to the present invention further comprises processing device (not shown).

If the D2D pair does not fulfill the predetermined condition, the processing device performs a corresponding processing to the D2D pair, wherein the corresponding processing including any one of the following:

1) The processing device selects another cellular user equipment from among the at least one cellular user equipment as the to-be-selected device.

For example, the processing device selects a not-to-be-selected-yet cellular user equipment from among the at least one cellular user equipment as a new to-be-selected device, and further determines whether the D2D pair fulfills the predetermined condition relative to the new to-be-selected device through the operations performed by the transmitting device of the D2D pair, the first obtaining device 11, the deciding device 12 and the first determining device 13 of the base station.

2) The processing device does not allocate the communication resource to the D2D pair within the current timeslot.

It should be noted that any approach of deciding, based on the transformations of the above various equations, e.g., any alteration performed to inequations (1) or (2), or any kinds of varied conditions derived based on the predetermined condition " ^≥ ^^Dth and ^^eNB≥ ^^cth " and the above equations (3) and (4), should be covered within the invention scope of the present invention.

As one preferred embodiment of the present invention, if the D2D pair supports two-way communication, the base station needs to obtain relevant parameters of the transmitting side and the receiving side in two communication directions, respectively, to perform the operations by the first obtaining device 11, deciding device 12 and the first determining device 13, so as to decide whether the D2D pair fulfills the predetermined condition in two directions, respectively, and when and only when both of the transmitting side and the receiving side in two communication directions fulfill the predetermined condition, the communication resource of the to-be-selected device is allocated to the D2D pair for it to perform communication.

The scheme according to the present invention, before allocating a communication resource to the D2D pair, detects the interference of the D2D pair with the base station and the interference from the cellular user equipment to the D2D pair, and only when the D2D pair fulfills a corresponding SINR ratio, the D2D pair is allowed to use the communication resource of the to-be-selected device for communication, thereby it can guarantee the corresponding QoS of the cellular link and the QoS of the D2D link of the D2D pair.

To those skilled in the art, it is apparent that the present invention is not limited to the details of the above exemplary embodiments, and the present invention may be implemented with other embodiments without departing from the spirit or basic features of the present invention. Thus, in any way, the embodiments should be regarded as exemplary, not limitative; the scope of the present invention is limited by the appended claims, instead of the above depiction. Thus, all variations intended to fall into the meaning and scope of equivalent elements of the claims should be covered within the present invention. No reference signs in the claims should be regarded as limiting the involved claims. Besides, it is apparent that the term "comprise" does not exclude other units or steps, and singularity does not exclude plurality. A plurality of units or modules stated in a system claim may also be implemented by a single unit or module through software or hardware. Terms such as the first and the second are used to indicate names, but do not indicate any particular sequence.

Claims

1. A method of determining a communication resource for a D2D pair in a base station, wherein the said base station corresponds to at least one cellular user equipment, wherein for a to-be-selected device among the said at least one cellular user equipment, the said method comprising: a. obtaining first related information corresponding to the said D2D pair, second related information corresponding to the said to-be-selected device, and third related information corresponding to the said base station; b. deciding whether said D2D pair fulfills a predetermined condition based on the said first, second and third related information in conjunction with a first SINR threshold corresponding to a receiving side of the said D2D pair and a second SINR threshold corresponding to the said base station; c. if the said D2D pair fulfills the predetermined condition, selecting a communication resource of the said to-be-selected device and allocating it to the said D2D pair to perform a D2D communication.

2. The method according to claim 1, wherein the said predetermined condition includes that a first SINR of a receiving side of the said D2D pair fulfills the first SINR threshold and a second SINR of the said base station fulfills the second SINR threshold, wherein the said method further comprises following steps:

- obtaining a second transmitting power of the transmitting side relative to the said base station; wherein, the said step b comprises: - determining the first SINR based on the obtained first related information and the D2D transmitting power information, and determining the second SINR based on the said second related information, the said third related information, and the said D2D transmitting power information;

- deciding whether the said first SINR and the said second SINR fulfill the predetermined condition based on the said first SINR threshold and the said second SINR threshold.

3. The method of claim 1 or 2, wherein the said first related information includes:

- first fading information of a D2D link between the said D2D pair;

- first interference-noise information of the said receiving side in the said D2D pair;

wherein the said second related information includes:

- second fading information between the said to-be-selected device and the said base station;

- first transmitting power of the said to-be-selected device;

wherein the said third related information includes:

- third fading information between the said base station and a transmitting side of the said D2D pair;

- second interference-noise information of the said base station.

4. The method according to claim 3, wherein the said first fading information includes first channel fading between the said transmitting side and the said receiving side, the said third fading information includes third channel fading between the said transmitting side and the said base station, the said first interference-noise information includes first noise power and first interference power, the said second interference-noise information includes second noise power and second interference power, wherein said predetermined condition includes the following inequation:

wherein ^ denotes the said third channel fading, ^ denotes the said first channel fading, ^^Dth denotes the said first SINR threshold, ^cuE denotes the said first transmitting power, ^hc denotes the said second channel fading; ^^Qh denotes the said second SINR threshold, ^Id denotes the said first interference power, ^^0D denotes the said first noise power, ^Ic denotes the said second interference power, and ^^oc denotes the said second noise power.

5. The method according to claim 3, wherein the said first fading information includes a first path distance of the said D2D link and a corresponding first path fading index; the said third fading information includes a second path distance between the said transmitting side and the said base station and a corresponding second path fading index, the said first interference-noise information includes a first noise power and a first interference power, the said second interference-noise information includes a second noise power and a second interference power, wherein the said predetermined condition includes the following inequation:

7cth (lD +^0D ) I_D +#( OD J wherein ^dcD denotes the said second path distance, ^ denotes the said second path fading index, ^d° denotes the said first path distance, ^a denotes the said first path fading index, ^7mh denotes the said first SINR threshold, ^cuE denotes the said first transmitting power, ^hc denotes the said second channel fading; ^^cth denotes the said second SINR threshold, ^Id denotes the said first interference power, ^^0D denotes the said first noise power, ^Ic denotes the said second interference power, and ^^oc denotes the said second noise power.

6. The method according to any one of claims 1 to 5, wherein the said method further comprises:

- if the said D2D pair does not fulfill the said predetermined condition, performing corresponding processing to the said D2D pair; wherein the said corresponding processing comprises any one of the following items:

- selecting another cellular user equipment from the said at least one cellular user equipment as the to-be-selected device;

- not allocating the communication resource to the D2D pair within the current timeslot.

7. A method of facilitating a base station to determine a communication resource for a D2D pair, wherein the said base station corresponds to at least one cellular user equipment, wherein the said method comprises the following steps:

- transmitting, to the base station, first related information of a D2D link between the said D2D pair, wherein the said first related information includes:

- first fading information of a D2D link between the said D2D pair;

- first interference-noise information of the receiving side in the said D2D pair.

8. A base station for determining a communication resource for a D2D pair, wherein the said base station corresponds to at least one cellular user equipment, wherein the said base station comprises the following devices to perform operations on a to-be-selected device among the said at least one cellular user equipment: a first obtaining device, configured to obtain first related information corresponding to the said D2D pair, second related information corresponding to the said to-be-selected device, and third related information corresponding to the said base station; a deciding device, configured to decide whether the said D2D pair fulfills a predetermined condition based on the said first, second and third related information in conjunction with a first SINR threshold corresponding to a receiving side of the said D2D pair and a second SINR threshold corresponding to the said base station; a first determining device, configured to, if the D2D pair fulfills the predetermined condition, select a communication resource of the said to-be-selected device and allocate it to the D2D pair to perform a D2D communication.

9. The base station according to claim 8, wherein the said predetermined condition includes that a first SINR of a receiving side of the said D2D pair fulfills the said first SINR threshold and a second SINR of the said base station fulfills the said second SINR threshold, wherein the said base station further comprises: a second obtaining device, configured to obtain a second transmitting power of a transmitting side relative to the said base station; wherein the deciding device comprises:

a second determining device, configured to determine the first SINR based on the obtained first related information and the D2D transmitting power information, and determine the second SINR based on the said second related information, the said third related information, and the said D2D transmitting power information; a sub-deciding device, configured to decide whether the said first SINR and the said second SINR fulfill the predetermined condition based on the said first SINR threshold and the said second SINR threshold.

10. The base station according to claim 8 or 9, wherein the said first related information includes:

- first fading information of a D2D link between the said D2D pair;

wherein the said second related information includes:

- first transmitting power of the said to-be-selected device;

wherein the said third related information includes:

- second interference-noise information of the said base station.

11. The base station according to claim 10, wherein the said first fading information includes first channel fading between the said transmitting side and the said receiving side, the said third fading information includes third channel fading between the said transmitting side and the said base station, the said first interference-noise information includes first noise power and first interference power, the said second interference-noise information includes second noise power and second interference power, wherein the said predetermined condition includes the following inequation:

wherein ^ denotes the said second channel fading, ^ denotes the said first channel fading, ^^Dth denotes the said first SINR threshold, ^cuE denotes the said first transmitting power, ^hc denotes the said second channel fading; ^^Qh denotes the said second SINR threshold, ^Id denotes the said first interference power, ^^0D denotes the said first noise power, ^Ic denotes the said second interference power, and ^^oc denotes the said second noise power.

12. The base station according to claim 10, wherein the said first fading information includes a first path distance of the said D2D link and a corresponding first path fading index; the said third fading information includes a second path distance between the said transmitting side and the said base station and a corresponding second path fading index, the said first interference-noise information includes a first noise power and a first interference power, the said second interference-noise information includes a second noise power and a second interference power, wherein the said predetermined condition includes the following inequation: >

wherein ^CD denotes the said second path distance, ^p denotes the said second path fading index, ^d° denotes the said first path distance, ^a denotes the said first path fading index, ^^Dth denotes the said first SINR threshold, ^cuE denotes the said first transmitting power, ^hc denotes the said second channel fading; ^^cth denotes the said second SINR threshold, ^Id denotes the said first interference power, ^^0D denotes the said first noise power, ^Ic denotes the said second interference power, and ^^oc denotes the said second noise power.

13. The base station according to any one of claims 8 to 12, wherein the said base station further comprises: a processing device, configured to, if the D2D pair does not fulfill the said predetermined condition, perform corresponding processing to the D2D pair; wherein the said corresponding processing comprises any one of the following items:

- selecting another cellular user equipment from the said at least one cellular user equipments as the to-be-selected device;

14. A D2D pair for facilitating a base station to determine a communication resource of the D2D pair per se, wherein the said base station corresponding to at least one cellular user equipment, wherein the said D2D pair comprises: a transmitting device, configured to transmit, to the base station, first related information of a D2D link between the said D2D pair, wherein the said first related information includes:

- first fading information of a D2D link between the said D2D pair; - first interference-noise information of the receiving side in the said

D2D pair.

15. A communication system, wherein said communication system comprises a base station according to any one of claims 8-13, at least one cellular user equipment corresponding to the said base station, and at least one D2D pair according to claim 14.