CN103702427A - Device discovery method for device-to-device communication in LTE (long term evolution) system - Google Patents
Device discovery method for device-to-device communication in LTE (long term evolution) system Download PDFInfo
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Abstract
本发明提供了一种LTE系统中D2D通信的设备发现方法，包括下列步骤：1）源用户设备接收用户输入的搜索范围信息，然后广播所述搜索范围信息；2）其它用户设备接收被广播的搜索范围信息，并根据自身当前的地理坐标是否处于搜索范围信息之内，判断自身是否是潜在目标用户设备；3）各潜在目标用户设备发送发现信号；4）源用户设备或者网络端设备接收发现信号。本发明能够在提供满足用户需求的目标用户的前提下，缩短用户发现时延。另外，本发明便于用户灵活地选择D2D通信设备发现的探测范围。
The present invention provides a device discovery method for D2D communication in an LTE system, which includes the following steps: 1) the source user equipment receives the search range information input by the user, and then broadcasts the search range information; 2) other user equipment receives the broadcasted search range information Search range information, and judge whether it is a potential target user equipment according to whether its current geographic coordinates are within the search range information; 3) Each potential target user equipment sends a discovery signal; 4) The source user equipment or network end equipment receives a discovery signal Signal. The present invention can shorten the time delay of user discovery on the premise of providing target users meeting user needs. In addition, the present invention facilitates the user to flexibly select the detection range discovered by the D2D communication device.
Description
Technical field
The present invention relates to cordless communication network technical field, specifically, the present invention relates to the method for discovering equipment of point-to-point communication in a kind of LTE system.
Background technology
Device-to-Device (D2D) communication, be called again point-to-point communication, it is a kind of under the control of system, allow the new technique directly communicating by multiplexing local resource between terminal, it can increase frequency spectrum efficiency of cellular communication system, reduce terminal transmit power, solve to a certain extent the problem of wireless communication system frequency spectrum resource scarcity.
Device discovery is the basis of carrying out D2D communication, is also therefore one of key issue of D2D communication.Document: R1-132187, ' D2D Discovery in LTE ', 3GPP TSG-RAN WG1Meeting#73. has discussed the auxiliary D2D device discovery of controlling of LTE network coverage lower network and user and has matched process, two large steps of D2D device discovery and user's pairing under the primary study network coverage: 1, transmission does not comprise the discovery signals of pay(useful) load, reach initial user and find and synchronous object; 2, the required exchanges data of D2D device discovery, as exchange subscriber the data such as ID, COS.Wherein step 1 comprises following sub-step:
A) network semi-dynamically retains for user the resource of initiating D2D;
B) user utilizes this resource to initiate D2D communication, and is detected by network;
C) network is other user assignment discovery signals;
D) other user sends discovery signals, and each user's discovery signals can be corresponding with this user's ID, and discovery signals is corresponding one by one with user ID;
E) source user receives discovery signals and sends to network;
F) network is chosen suitable targeted customer.
Document: R1-132067, ' General Considerations for D2D Discovery ', more careful three steps that designed clearly device discovery and user's pairing of 3GPP TSG-RAN WG1Meeting#73., comprising: 1, user detects; 2, identification; 3, authentication.Wherein step 1 comprises following sub-step:
A) network is the reserved D2D communication resource of user;
B) user, according to the algorithm of pre-download, produces discovery signals, the Radio Resource in Gains resources pond;
C) user periodically sends discovery signals;
D) source user is surveyed the feasibility of communicating by letter between other user and this user, chooses targeted customer, completes synchronous.
In above-mentioned two schemes, no matter be to choose targeted customer by network or by source user, all need to receive a plurality of discovery signals, and the reservation of LTE system is limited for D2D resource, each time slot can only receive a discovery signals conventionally, when discovery signals is too much, receive the chronic of discovery signals, cause D2D communication link setup delay larger.And if restriction in advance receives the duration of discovery signals, the discovery signals that received is incomplete, the probability of now missing better target user is relatively large, causes the expectation of selected targeted customer and source user to have larger gap.
Summary of the invention
Therefore, the object of the invention is to overcome the deficiencies in the prior art, the solution of the device discovery of point-to-point communication in a kind of LTE system of optimization is provided.
For achieving the above object, the present invention proposes the method for discovering equipment of D2D communication in a kind of LTE system, comprise the following steps:
1) source user equipment receives the hunting zone information of user's input, then broadcasts described hunting zone information;
2) other subscriber equipment receives the hunting zone information being broadcasted, and according to self current geographical coordinate whether within the information of hunting zone, judge whether self is potential target subscriber equipment;
3) each potential target subscriber equipment sends discovery signals;
4) source user equipment or network side equipment receive discovery signals.
Wherein, in described step 1), described source user equipment is directly broadcasted or is broadcasted described hunting zone information by network terminal.
Wherein, in described step 4), source user equipment or network side equipment are selected the target UE of D2D communication from potential target subscriber equipment according to received discovery signals.
Wherein, in described step 1), described hunting zone information is (R
1, R
2, θ
1, θ
2) hunting zone of form, wherein R=[R
1, R
2] be search radius scope, θ=[θ
1, θ
2] be search angular range.
Wherein, in described step 1), the hunting zone that described hunting zone information limits is circle centered by source user equipment, fan-shaped, annular or encircle fan-shaped.
Wherein, network terminal is stored a series of zone name and corresponding positional information thereof, and in described step 1), described hunting zone information is zone name.
Wherein, described step 1) comprises following sub-step:
11) source user equipment receives the hunting zone information of user's input, and hunting zone information refers to the residing geographic range information of the desired target UE of user;
12) the reserved D2D communication resource of source user equipment utilization sends D2D communication to network terminal and initiates message, wherein carries hunting zone information;
13) network termination is received after D2D communication initiation message, extracts hunting zone information, and by this hunting zone information broadcasting.
Wherein, described step 1) comprises following sub-step:
11) source user equipment receives the hunting zone information of user's input, and hunting zone information refers to the residing geographic range information of the desired target UE of user;
12) the reserved broadcast channel of source user equipment utilization is by described hunting zone information broadcasting.
Compared with prior art, the present invention has following technique effect:
1, the present invention can provide under the targeted customer's who meets consumers' demand prerequisite, shortens user and finds time delay.
2, the investigative range that D2D communication equipment is found is convenient to user flexibility and is selected in the present invention.
Accompanying drawing explanation
Below, describe by reference to the accompanying drawings embodiments of the invention in detail, wherein:
Fig. 1 shows the flow chart of one embodiment of the invention;
Fig. 2 shows the schematic diagram of the hunting zone expressional scheme in one embodiment of the invention;
Fig. 3 shows the schematic diagram of the concrete application scenarios based on one embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is done further and described.
The method for discovering equipment of D2D communication in a kind of LTE system is provided according to one embodiment of present invention.The method is according to D2D short-range feature of communicating by letter, utilize user's known or demand to set D2D communication hunting zone, limit the rear potential target user who obtains within the scope of this of detection range (being hereinafter called for short hunting zone) of D2D device discovery subscriber equipment, only need the feasibility of detection source subscriber equipment and these potential target communications of user equipment, choose D2D communication target subscriber equipment.Can choose under the prerequisite of quality not reducing target UE like this, significantly reduce the expense of channel detection, reduce link establishment time delay.Fig. 1 shows the schematic flow sheet of method for discovering equipment of the D2D communication of the present embodiment, comprises the following steps:
Step 1: network terminal is the reserved D2D communication resource of subscriber equipment;
Step 2: source user equipment receives the hunting zone information of user's input, and hunting zone information refers to the residing geographic range information of the desired target UE of user;
Step 3: the reserved D2D communication resource of source user equipment utilization sends D2D communication to network terminal and initiates message, wherein carries hunting zone information;
Step 4: network termination is received after D2D communication initiation message, extracts hunting zone information, and by this hunting zone information broadcasting;
Step 5: other subscriber equipment receives the hunting zone information being broadcasted, and according to self current geographical coordinate whether within the information of hunting zone, judge whether self is potential target subscriber equipment;
Step 6: each potential target subscriber equipment sends discovery signals;
Step 7: network terminal or source user equipment receive discovery signals, select target UE from potential target subscriber equipment.
In the method for discovering equipment of above-mentioned D2D communication, carry out potential target user screening, only have potential target user just to send discovery signals, so often can significantly reduce the number of the discovery signals of the required reception of source user equipment, the D2D resource-constrained retaining in LTE system, each time slot can only receive under the condition of a discovery signals conventionally, and the minimizing of discovery signals number can be shortened the duration that receives discovery signals significantly.And on the other hand, each subscriber equipment receives geographic range information, and judge it self is whether that the process of potential target subscriber equipment is executed in parallel separately, so it is relatively short to carry out the required time of this process.Therefore, must, utilize hunting zone information sifting potential target subscriber equipment, can help to reduce the time delay of setting up D2D communication link.
Fig. 2 shows the expressional scheme of hunting zone information in the step 2 of one embodiment of the invention.According to this embodiment, subscriber equipment is provided for the user interface of inputted search range information.When user wishes to understand in real time the situation in the place in some place or certain particular range, for example understand in real time situation or the graduation party live show of trade company, and user understands the relative bearing in these places, in the discovery procedure of D2D communication equipment, user can utilize own known information to limit D2D communication hunting zone, the scope that user sets can be circular or fan-shaped, can also be annular or encircle fan-shaped, as shown in Figure 2.Hunting zone can be expressed as (R
1, R
2, θ
1, θ
2), R=[R wherein
1, R
2] be search radius scope, θ=[θ
1, θ
2] be search angular range.Hunting zone S=[r, α | R
1≤ r≤R
2, θ
1≤ α≤θ
2].According to one embodiment of present invention, in step 4, (the R of the direct broadcasting user input of network terminal
1, R
2, θ
1, θ
2) hunting zone of form, in step 5, other subscriber equipment can be according to the azimuth-range of the relative source user equipment of positional information calculation self of self current positional information and source user equipment, and then judges whether within the hunting zone setting.Certainly, in other embodiments, also can be by network terminal according to the (R of user's input
1, R
2, θ
1, θ
2) hunting zone and the current positional information of source user equipment of form precompute the hunting zone information that geographical latitude and longitude coordinates represents, then in step 4, broadcasts the hunting zone information that this geography latitude and longitude coordinates represents.
According to another embodiment of the invention, the hunting zone information of described step 2 adopts another kind of expressional scheme.Network terminal (for example base station) is stored a series of zone name and corresponding positional information thereof.In step 2,3, the source user of D2D service provides the title in the region that will search for to network terminal, for example, obtain the learning materials of a certain course of Beijing Normal University, can be chosen in search within the scope of Beijing Normal University.In step 4, network terminal is converted to positional information by zone name, and broadcasts the positional information of changing.
According to still a further embodiment, the method for discovering equipment of another D2D communication is also provided, wherein, when source user self has broadcast channel resource, in described step 3, D2D communication is initiated needn't carry geographic range information in message, in described step 4, network terminal is broadcasting geo range information not, but directly broadcasts this geographic range information by source user equipment, and all the other steps are consistent with previous embodiment.
For being more convenient to understand, provide the concrete application scenarios based on one embodiment of the invention below.Fig. 3 shows the concrete application scenarios based on one embodiment of the invention, and in figure, dormitory building A has lodging personnel 100 people, wherein supports the user of D2D communication to have 20 people, comprising user 1; Dormitory building B has lodging personnel 100 people, wherein supports the user of D2D communication to have 30 people; Auditorium C is carrying out musicale, has spectators 300 people, wherein supports the user of D2D communication to have 50 people.In dormitory building A, user 1 wishes to watch a certain singer's performance in auditorium C, therefore initiates D2D service, and user 1 is exactly source user like this.Because user 1 knows substantially orientation or obtain orientation, auditorium by map etc., auditorium, user 1 can setting search scope be S=[r, α | R
1≤ r≤R
2, θ
1≤ α≤θ
2].Then the reserved D2D communication resource of user's 1 equipment utilization sends D2D communication to network terminal and initiates message, wherein carries hunting zone information; Network termination is received after D2D communication initiation message, is become geographical latitude and longitude coordinates to represent hunting zone information conversion, and broadcast this message; In dormitory B and auditorium C, subscriber equipment receives the hunting zone information being broadcasted, and according to self current geographical coordinate whether within the information of hunting zone, judge whether self is potential target subscriber equipment; In auditorium C, user judgment result is that the potential target user who therefore becomes this D2D communication in hunting zone, and in dormitory B, user judgment result is that not in hunting zone, is not therefore the potential target user of this D2D communication; Like this, only have 50 potential target subscriber equipmenies in auditorium C to send discovery signals; Network terminal or user's 1 equipment receive the discovery signals that in auditorium C, potential target subscriber equipment sends, and from potential target subscriber equipment, select target UE.And if adopt the scheme of prior art, user's 1 equipment may need intactly to receive the discovery signals that other subscriber equipment (99 altogether) that dormitory building A, B communicate by letter with all supports of auditorium C D2D sends, and this has increased the time delay of nearly a times than the solution of the present invention.
Finally it should be noted that, above embodiment is only in order to describe technical scheme of the present invention rather than this technical method is limited, the present invention can extend to other modification, variation, application and embodiment in application, and therefore thinks that all such modifications, variation, application, embodiment are in spirit of the present invention and teachings.
Claims (8)
1. a method for discovering equipment for D2D communication in LTE system, comprises the following steps:
1) source user equipment receives the hunting zone information of user's input, then broadcasts described hunting zone information;
2) other subscriber equipment receives the hunting zone information being broadcasted, and according to self current geographical coordinate whether within the information of hunting zone, judge whether self is potential target subscriber equipment;
3) each potential target subscriber equipment sends discovery signals;
4) source user equipment or network side equipment receive discovery signals.
2. the method for discovering equipment of D2D communication in LTE system according to claim 1, is characterized in that, in described step 1), described source user equipment is directly broadcasted or broadcasted described hunting zone information by network terminal.
3. the method for discovering equipment that in LTE system according to claim 1, D2D communicates by letter, it is characterized in that, in described step 4), source user equipment or network side equipment are selected the target UE of D2D communication from potential target subscriber equipment according to received discovery signals.
4. the method for discovering equipment of D2D communication in LTE system according to claim 1, is characterized in that, in described step 1), described hunting zone information is (R
1, R
2, θ
1, θ
2) hunting zone of form, wherein R=[R
1, R
2] be search radius scope, θ=[θ
1, θ
2] be search angular range.
5. the method for discovering equipment of D2D communication in LTE system according to claim 1, is characterized in that, in described step 1), the hunting zone that described hunting zone information limits is circle centered by source user equipment, fan-shaped, annular or encircle fan-shaped.
6. the method for discovering equipment of D2D communication in LTE system according to claim 1, is characterized in that, network terminal is stored a series of zone name and corresponding positional information thereof, and in described step 1), described hunting zone information is zone name.
7. according to the method for discovering equipment of D2D communication in the LTE system described in any one in claim 1 to 6, it is characterized in that, described step 1) comprises following sub-step:
11) source user equipment receives the hunting zone information of user's input, and hunting zone information refers to the residing geographic range information of the desired target UE of user;
12) the reserved D2D communication resource of source user equipment utilization sends D2D communication to network terminal and initiates message, wherein carries hunting zone information;
13) network termination is received after D2D communication initiation message, extracts hunting zone information, and by this hunting zone information broadcasting.
8. according to the method for discovering equipment of D2D communication in the LTE system described in claim 1 to 6 any one, it is characterized in that, described step 1) comprises following sub-step:
11) source user equipment receives the hunting zone information of user's input, and hunting zone information refers to the residing geographic range information of the desired target UE of user;
12) the reserved broadcast channel of source user equipment utilization is by described hunting zone information broadcasting.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103945563A (en) * | 2014-04-11 | 2014-07-23 | 中国科学院计算技术研究所 | No-target user detection method in Device to Device communication |
| CN106489285A (en) * | 2014-08-05 | 2017-03-08 | 华为技术有限公司 | D2D terminal, system and D2D have found method |
| CN107258097A (en) * | 2015-02-26 | 2017-10-17 | 高通股份有限公司 | Ranging based on agency in wireless communication system |
| CN111866817A (en) * | 2020-06-23 | 2020-10-30 | 广东以诺通讯有限公司 | D2D terminal mode communication selection method under 5G hybrid networking |
| CN112235725A (en) * | 2020-11-02 | 2021-01-15 | 深圳市中诺通讯有限公司 | Method for automatically realizing regional broadcast based on 5G D2D technology |
-
2013
- 2013-12-24 CN CN201310723726.3A patent/CN103702427A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103945563A (en) * | 2014-04-11 | 2014-07-23 | 中国科学院计算技术研究所 | No-target user detection method in Device to Device communication |
| CN106489285A (en) * | 2014-08-05 | 2017-03-08 | 华为技术有限公司 | D2D terminal, system and D2D have found method |
| US10425882B2 (en) | 2014-08-05 | 2019-09-24 | Huawei Technologies Co., Ltd. | D2D station, system and D2D discovery method |
| CN106489285B (en) * | 2014-08-05 | 2019-11-19 | 华为技术有限公司 | D2D terminal, system and D2D discovery method |
| CN107258097A (en) * | 2015-02-26 | 2017-10-17 | 高通股份有限公司 | Ranging based on agency in wireless communication system |
| CN111866817A (en) * | 2020-06-23 | 2020-10-30 | 广东以诺通讯有限公司 | D2D terminal mode communication selection method under 5G hybrid networking |
| CN111866817B (en) * | 2020-06-23 | 2024-04-05 | 广东以诺通讯有限公司 | D2D terminal mode communication selection method under 5G hybrid networking |
| CN112235725A (en) * | 2020-11-02 | 2021-01-15 | 深圳市中诺通讯有限公司 | Method for automatically realizing regional broadcast based on 5G D2D technology |
| CN112235725B (en) * | 2020-11-02 | 2022-12-02 | 深圳市中诺通讯有限公司 | Method for automatically realizing regional broadcast based on 5G D2D technology |
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