CN106162737B - A kind of D2D equipment autonomously discovery method based on adaptive congestion control - Google Patents
A kind of D2D equipment autonomously discovery method based on adaptive congestion control Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0289—Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
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Abstract
The present invention discloses a kind of D2D equipment autonomously discovery method based on adaptive congestion control, method includes the following steps: cell eNodeB distribution cell-specific finds resource pool and sets the discovery period；D2D user carries out random access；The user being successfully accessed obtains dedicated discovery resource pool and discovery period；Cell eNodeB adaptively controls the competition number of users in current dedicated discovery resource pool；Uncontrolled D2D user determines to carry out the random competition of Current resource according to the broadcast message of eNodeB；The user and this controlled user for competing failure will continue to receive base station broadcast message before next dedicated discovery resource pool arrives, and repeat the above steps；The successful D2D user of random competition sends the discovery message of itself, and receives the discovery message of surrounding D2D user.The present invention can reduce the collision probability between user by using adaptive congestion control mechanism, avoid network congestion, the progress of effective guarantee D2D communication.
Description
Technical field
The present invention relates to D2D fields of communication technology.It is set more particularly, to a kind of D2D based on adaptive congestion control
Standby autonomous discovery method.
Background technique
D2D (Device-to-Device) communication technology, i.e., the direct communication technology between device-to-device are the following 5G nets
A crucial candidate technologies in network.D2D communication can make data directly reach mesh equipment without the forwarding of core network,
Therefore the power system capacity of message transmission rate and network can be effectively improved, there is greatly research and application value.As
The premise and basis of D2D communication, the discovery of D2D equipment are always the key technology of D2D technology, how to allow each D2D equipment most
Potential communication user around possible more automatic identifications is the problem faced at present, therefore improving equipment discovery efficiency is to grind
The emphasis direction studied carefully.
The discovery of D2D equipment refers to the process of an equipment identification surrounding neighbours device end.Under normal conditions, D2D is completed
Equipment is the discovery that the precondition of D2D communication.There are two types of D2D device discovery techniques: one is the discoveries based on core net, each
D2D equipment is all by carrying out discovery of the information exchange realization to surrounding neighbours with eNodeB；Another kind is the autonomous hair of equipment room
Existing, sending and receiving for discovery signal can directly be carried out by referring between equipment, directly obtain the information of surrounding neighbours.Autonomous discovery
Mode can get rid of dependence of the equipment to core network, independently complete discovery procedure, discovery efficiency with higher and lower
It was found that time delay.
Two major classes are broadly divided into about the scheduling of resource found for D2D equipment at present: type one and type two, wherein class
Type two includes two different classification again.Under the scene that type one is covered mainly for the network coverage or subnetwork, using week
The mode of phase resource allocation provides resource pool for user.Type two refers to that under the scene of the network coverage, eNodeB, which is concentrated, to be adjusted
Degree sends resource control signaling to user, and wherein one of type two refers to carries out in the sending instant of each discovery signal
Dynamic dispatching, another in type two refers to carries out scheduling of resource by the way of semi-static, and base station is according to different user
Distribute different periodical discovery resources.Research is adopted as user's period and provides the mode of resource pool mostly at present, but existing
The generally existing discovery of scheme is inefficient and finds the larger problem of time delay.
Congestion control mechanism is to solve in cellular network because of network caused by a large number of users access network process earliest
Congestion problems and the controlling mechanism proposed, the mechanism can prevent some or all of user equipment from establishing RRC (Radio
Resource Control, wireless heterogeneous networks) connection, therefore can carry out accessing caused peak to avoid large number of equipment, together
When avoid the signaling congestion and overload of core net.In this mechanism, each user equipment can be according to the access of the broadcast of base station
Controlling elements execute access procedure, if usually the factor is fixed dry values.Network indicates individually to use using control signaling
How family or user grouping scale the access control parameter of Web broadcast.The purpose of scaling is the access controlling elements according to broadcast
(Barring Factor), the access different degrees of to each user or user point application control.On the manufacturing basis, if base station
Optimal access controlling elements can be dynamically calculated according to current potential accessing user's quantity, then can reach adaptive congestion control
The purpose of system.Since congestion control mechanism can be good at controlling the competition quantity of equipment, the collision reduced in resource contention is general
Rate, therefore this technology is applied to improve equipment success probability of detection in D2D discovery mechanism to a certain extent.
Accordingly, it is desirable to provide a kind of D2D equipment autonomously based on adaptive congestion control finds method.
Summary of the invention
It is an object of the invention to, provide a kind of to improve equipment based on adaptive congestion control in view of the foregoing drawbacks
It was found that efficiency, reduction discovery time delay, ensure that the D2D equipment autonomously of D2D equipment room instant messaging finds method.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
A kind of D2D equipment autonomously discovery method based on adaptive congestion control, method includes the following steps:
Step1: in one cell of LTE-A network, cell eNodeB is set for distributing cell-specific discovery resource pool
Discovery cycle T between fixed adjacent dedicated discovery resource poold, dedicated discovery resource pool is for D2D equipment transmission discovery message；
Step2: one or more D2D users carry out random access in cell；
Step3: being successfully accessed the D2D user of cell, and the dedicated hair of cell is obtained by the broadcast message of cell eNodeB
Existing resource pool and discovery cycle Td；
Step4: cell eNodeB competes number of users M according to current potential resourcei, current by broadcasting adaptively control
Competition number of users in dedicated discovery resource pool, while D2D user is divided into controlled D2D user and uncontrolled D2D
User；
Step5: the controlled D2D user before current dedicated discovery resource pool arrives without Current resource with
Machine competition, the uncontrolled D2D user determine before current dedicated discovery resource pool arrives according to the broadcast message of eNodeB
Surely the random competition of Current resource is carried out；
Step6: the user and this controlled user for competing failure understand before next dedicated discovery resource pool arrives after
Base station broadcast message is received in continued access, and repeats above-mentioned Step3-Step5；
Step7: the successful D2D user of random competition is used to send the discovery of itself using the dedicated discovery resource competed
Message, other the non-selected discovery resource locations being also used in Current resource pond carry out blind examination, receive surrounding D2D user's
It was found that message；
LTE-A network refers to long-term evolution upgrading network；ENodeB refers to evolved mobile base station；D2D refers to that device-to-device is logical
Letter.
Preferably, it is successfully accessed the D2D user of cell, D2D reporting of user week is also obtained by the broadcast message of eNodeB
Phase.
Preferably, this method further includes following steps:
Step8: other D2D users are successfully received and find that the D2D user of message arranges to its neighbour of eNodeB periodic report
Table, neighbor list include the neighbor information and newfound neighbor information of maintenance.
Preferably, the dedicated running time-frequency resource for finding Physical Uplink Shared Channel in resource occupation LTE-A network.
Preferably, this method further includes following steps:
Step9:eNodeB is in one D2D list of devices of local maintenance: if there is new D2D user to access, eNodeB will add
Add new D2D user information into D2D list of devices；If certain equipment in D2D list of devices does not have in the time threshold of setting
The maintenance of information with eNodeB is kept, then eNodeB will delete the information of this D2D user from D2D list of devices.
Preferably, cycle T is founddThe signal time domain length of discovery message is sent greater than one, and finds cycle TdFor 1ms
Integral multiple.
Preferably, user M is potentially competediIncluding new registration user Mn, last time competition failure user MfIt was controlled with last time
Do not compete user Mc, and Mi=Mn+Mf+Mc。
Preferably, adaptively control it is next it is dedicated discovery resource pool in competition number of users specifically includes the following steps:
Step4.1:eNodeB calculates the desired value for carrying out the optimal user number of resource contention every time
The current potential competition number of users M of Step4.2:eNodeB statisticsi, and it is calculated from the formula optimum control factor
PB:
Wherein PBFor optimum control factor, value range is (0~1),For optimal user number desired value, MiIt is latent
In competition number of users；
Step4.3:eNodeB is before current dedicated discovery resource pool arrives through the potential competition in broadcast notifying cell
User's optimum control factor PB；
Step4.4: potential user generates a random number P after receiving broadcast at random in this equipment in cellX；
Step4.5: if PX≤PB, then the user is uncontrolled D2D user；
Step4.6: if PX> PB, then the user is controlled D2D user.
It is further preferred that the desired value of optimal user numberIt is obtained by following calculating:
Above formula optimal solution is the desired value of optimal user number:
Wherein, E (S) indicates to carry out the successful user's number expectation of resource random competition, m in each dedicated discovery resource pool
Indicate user's number of participation resource contention, R indicates the number of the available resources pair configured in dedicated discovery resource pool.
Preferably, discovery message includes device id, coding mode and the synchronization message of D2D user.
Preferably, keeping out of the way often is fixed according to eNodeB instruction in controlled user, back off time be 4s~
512s, the user not competitive resource in back off time.
Beneficial effects of the present invention are as follows:
Technical solution of the present invention belongs to the autonomous discovery mechanism of D2D equipment, and entire discovery procedure is to core network
It relies on very little and is not necessarily to know other additional informations such as specific location of user, generally complexity drops significantly for network
It is low.Meanwhile the collision probability between user can be reduced by using adaptive congestion control mechanism, network congestion is avoided, is made
Successful user number realizes the theoretially optimum value under random sources competition mechanism, the progress of effective guarantee D2D communication.Furthermore it is setting
In the case that standby or link breaks down, guarantee the robustness of network.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 shows the schematic diagram of LTE-A network framework.
Fig. 2 shows the flow charts of the D2D equipment autonomously discovery method based on adaptive congestion control.
Fig. 3 shows the detailed of D2D equipment room discovery procedure in the D2D equipment autonomously discovery method based on adaptive congestion control
Thin flow chart.
Fig. 4 shows the resource distribution schematic diagram of D2D equipment autonomously discovery method in LTE-A network.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
The D2D equipment autonomously discovery method by provided in this embodiment based on adaptive congestion control is applied to as schemed below
LTE-A network shown in 1 is further described, shown in (eNB is eNodeB in figure) as shown in Figure 1, Figure 2, the present embodiment provides
D2D equipment autonomously based on adaptive congestion control find method, include the following steps:
Step1: in one cell of LTE-A network, cell eNodeB is set for distributing cell-specific discovery resource pool
Discovery cycle T between fixed adjacent dedicated discovery resource poold, dedicated discovery resource pool is for D2D equipment transmission discovery message.It was found that
Cycle TdThe signal time domain length of discovery message is sent greater than one, and finds cycle TdFor the integral multiple of 1ms.Dedicated discovery money
Source pond includes two dimensions of time and frequency, and each dedicated discovery resource pool crosses over 30ms on time dimension.It was found that message package
Device id, coding mode and synchronization message containing D2D user.LTE-A network refers to that long-term evolution upgrading network, eNodeB refer to evolution
Type mobile base station, D2D refer to that device-to-device communicates.PUSCH channel (physical uplink in dedicated discovery resource occupation LTE-A network
Shared channel) running time-frequency resource.
Step2: one or more D2D users carry out random access in cell, and D2D user carries out random access mistake in cell
Journey is similar with the access procedure of legacy cellular user, but needs to inform that eNodeB oneself is D2D equipment in access information.
Step3: being successfully accessed the D2D user of cell, and the dedicated hair of cell is obtained by the broadcast message of cell eNodeB
Existing resource pool and discovery cycle Td, it is successfully accessed the D2D user of cell, D2D user is also obtained by the broadcast message of eNodeB
Report cycle.Arrival period (i.e. discovery period), distribution comprising dedicated discovery resource in eNodeB broadcast message are used for D2D
Equipment sends the information such as the time-frequency location of the dedicated discovery resource of discovery message and the report cycle of D2D user, D2D user's
Report cycle is that the neighbor list of oneself is reported to period of eNodeB by D2D user, the report cycle of above-mentioned D2D user according to
Specific cell conditions setting, is typically set at 100s-600s.The dedicated discovery resource occupation of distribution is in LTE-A network
The running time-frequency resource of PUSCH channel reports information also by PUSCH transmission.
Step4: cell eNodeB competes number of users M according to current potential resourcei, current by broadcasting adaptively control
Competition number of users in dedicated discovery resource pool, while D2D user is divided into controlled D2D user and uncontrolled D2D
User.Potential competition user MiIncluding new registration user Mn, last time competition failure user MfWith last time controlled use was not competed
Family Mc, and Mi=Mn+Mf+Mc.Wherein, current dedicated discovery resource pool refers to currently available dedicated discovery resource pool, process tool
Body the following steps are included:
Step4.1:eNodeB calculates the desired value for carrying out the optimal user number of resource contention every timeUnder it passes through
Calculating is stated to obtain:
It is found that above formula optimal solution is the desired value of optimal user number, therefore above formula derivation is obtained:
Enable E'(S)=0, then
It is found that for the controlling elements broadcasted every time, PBIt is to be determined by R.Wherein, E (S) indicates each dedicated discovery money
The successful user's number expectation of resource random competition is carried out in the pond of source, m indicates to participate in user's number of resource contention, and R indicates special
With the number of the available resources pair configured in discovery resource pool；
The current potential competition number of users M of Step4.2:eNodeB statisticsi, and it is calculated from the formula optimum control factor
PB:
Wherein PBFor optimum control factor, value range is (0~1),For optimal user number desired value, MiIt is latent
In competition number of users；
Step4.3:eNodeB is before current dedicated discovery resource pool arrives through the potential competition in broadcast notifying cell
User's optimum control factor PB；
Step4.4: potential user generates a random number P after receiving broadcast at random in this equipment in cellX；
Step4.5: if PX≤PB, then the user is uncontrolled D2D user；
Step4.6: if PX> PB, then the user is controlled D2D user.
Step5: the controlled D2D user before current dedicated discovery resource pool arrives without Current resource with
Machine competition, the uncontrolled D2D user determine before current dedicated discovery resource pool arrives according to the broadcast message of eNodeB
Surely the random competition of Current resource is carried out.I.e. a certain uncontrolled D2D user is when each dedicated discovery resource arrives, with it
His uncontrolled D2D user competes some time-frequency location in dedicated discovery resource pool using random manner.It is controlled
User it is as needed, be fixed keeping out of the way often according to eNodeB instruction, back off time is 4s~512s, in back off time
The user not competitive resource.When competition, each D2D user is at the time of the resource pool for the dedicated discovery message of D2D arrives
The presence for attempting to broadcast oneself to surrounding neighbours selects transmission of the RB to discovery message is carried out by the way of random competition,
We define herein: if some RB is to (being specially used for transmission the running time-frequency resource of discovery message) in dedicated discovery resource pool DZ
Just it is only chosen by a D2D user, then it is assumed that the D2D user competes successfully.Successful D2D user is competed by setting
Fixed cycle TsDedicated discovery resource is competed, again to safeguard the neighborhood with D2D user in its neighbor list, above-mentioned fixation
Cycle TsIt is set as finding the integral multiple in period, is typically set at 150s-300s., whereas if more than two D2D user's selections
Same RB pairs, then it is assumed that these D2D users collide, this competition failure.
Step6: the user and this controlled user for competing failure understand before next dedicated discovery resource pool arrives after
Base station broadcast message is received in continued access, and repeats above-mentioned Step3-Step5, wherein next dedicated discovery resource pool refers to next available
Dedicated discovery resource pool.
Step7: the successful D2D user of random competition is used to send the discovery of itself using the dedicated discovery resource competed
Message, other the non-selected discovery resource locations being also used in Current resource pond carry out blind examination, receive surrounding D2D user's
It was found that message.
Step8: other D2D users are successfully received and find that the D2D user of message arranges to its neighbour of eNodeB periodic report
Table, neighbor list include the neighbor information and newfound neighbor information of maintenance.D2D user also safeguards neighbours' column local
Table, it is every pass through n (n >=1) a dedicated discovery resource area, it may be found that neighbor information record neighbor list, and by PUSCH to
ENodeB periodic report local neighbor list.It include the newfound neighbours of the D2D user and periodic maintenance in local neighbor list
Neighbor information, if some neighbour in list cannot be received again with the discovery of the neighbours in maximum latency
Message, then delete corresponding user equipment information, and the setting range of above-mentioned maximum latency is 3min-10min.
Step9:eNodeB is in one D2D list of devices of local maintenance: if there is new D2D user to access, eNodeB will add
Add new D2D user information into D2D list of devices；If certain equipment in D2D list of devices does not have in the time threshold of setting
The maintenance of information with eNodeB is kept, then eNodeB will delete the information of this D2D user, above-mentioned maintenance from D2D list of devices
Information time length is set according to specific cell conditions, is typically set at 10s-60min.
The detailed process of D2D equipment room discovery procedure as shown in figure 3, its detailed process is as follows:
Current D2D user's booting initializes, and scans channel.
Current D2D user reports itself identity information to place cell eNodeB application random access.
If subzone network where current D2D user is successfully accessed, it is small this will to be received by PBCH (physical broadcast) channel
The broadcast message of area eNodeB, the message that D2D user is related in broadcast message includes that this cell can be used for D2D equipment and send hair
The private resource configuration of existing message and discovery period etc..Resource in present example in LTE-A network for the discovery of D2D equipment
Configuration diagram is as shown in figure 4, wherein DZ indicates the dedicated discovery resource pool of D2D user, by certain cycle TdLoop configuration, it is dedicated
It was found that resource pool includes two dimensions of time and frequency, each dedicated discovery resource pool crosses over 30ms on time dimension.
ENodeB can will add new user information when there is new D2D user access in one D2D list of devices of local maintenance
Into list, if certain equipment in list does not have to keep the maintenance of information with eNodeB after reaching certain time length,
ENodeB will delete the relevant information of this equipment
Current D2D user will receive after local resource configuration information where acquisition before dedicated discovery resource pool reaches
ENodeB is broadcasted, and the eNodeB in cell competes user according to current potential resource before each dedicated discovery resource pool arrives
Number, by broadcasting the competition number of users adaptively controlled in dedicated discovery resource pool.Wherein not controlled user will carry out
Random sources competition to send itself related discovery information to surrounding neighbours, the discovery information content of transmission include device id,
Coding mode, synchronization message etc..
Not controlled user's is to be selected in all potential competition users by eNodeB by congestion control mechanism
It arrives, detailed process is as described above, repeats no more；
Furthermore if necessary, controlled do not compete user and can indicate fixed the moving back often of further progress according to eNodeB
It keeps away, back off time range is 4s~512s, these users will no longer competitive resource within this time.
If user competes successfully, associated timer can be opened and carry out timing to the fixed cycle of setting, it is only fixed
When terminate then after just can successful user just will do it resource contention next time, with maintenance and D2D user in its neighbor list
Neighborhood, the above-mentioned fixed cycle be set as find the period integral multiple, be typically set at 150s-300s.
The successful D2D user of random competition removes the discovery message that its own is sent using the dedicated discovery resource competed
Outside, also blind examination can be carried out in the non-selected discovery resource location of other in Current resource pond, to receive the hair of surrounding D2D user
Existing message.
If current D2D user receives the discovery message for carrying other D2D user informations, more according to the discovery message
Itself new neighbor information list, and according to neighbor list information by the neighbor information periodic report of update to eNodeB.
It should be noted that eNodeB can arrange information comprising the D2D user found mutually at local maintenance one
Table, and list is updated according to the reported result of each user.What this list included is all potential progress D2D communications of this cell
Can equipment pair, eNodeB will judge carry out D2D communication between certain two D2D user according to this list.
In conclusion the present invention provides a kind of, the D2D equipment autonomously based on adaptive congestion control finds method, the hair
Existing method requires no knowledge about the more specific location information of D2D user, and complexity is low, can be prevented largely by the dynamic regulation of base station
User carry out resource contention and caused by congestion to reduce collision probability improve the utilization efficiency of Internet resources.Furthermore it is setting
In the case that standby or link breaks down, the robustness of network can effectively ensure that.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (9)
1. a kind of D2D equipment autonomously based on adaptive congestion control finds method, which is characterized in that this method includes following step
It is rapid:
Step1: in one cell of LTE-A network, cell eNodeB sets phase for distributing cell-specific discovery resource pool
Discovery cycle T between adjacent dedicated discovery resource poold, the dedicated discovery resource pool is for D2D equipment transmission discovery message；
Step2: one or more D2D users carry out random access in cell；
Step3: being successfully accessed the D2D user of cell, is provided by the dedicated discovery that the broadcast message of cell eNodeB obtains cell
Source pond and discovery cycle Td；
Step4: cell eNodeB competes number of users M according to current potential resourcei, current dedicated by broadcasting adaptively control
It was found that the competition number of users in resource pool, while D2D user is divided into controlled D2D user and uncontrolled D2D user,
It is described adaptively control it is next it is dedicated discovery resource pool in competition number of users specifically includes the following steps:
Step4.1:eNodeB calculates the desired value for carrying out the optimal user number of resource contention every time
The current potential competition number of users M of Step4.2:eNodeB statisticsi, and it is calculated from the formula optimum control factor PB:
Wherein PBFor optimum control factor, value range is (0~1),For optimal user number desired value, MiIt is potential competing
Contention amount, wherein the desired value of the optimal user numberIt is obtained by following calculating:
Above formula optimal solution is the desired value of optimal user number:
Wherein, E (S) indicates to carry out the successful user's number expectation of resource random competition in each dedicated discovery resource pool, and m is indicated
User's number of resource contention is participated in, R indicates the number of the available resources pair configured in dedicated discovery resource pool；
Step4.3:eNodeB is before current dedicated discovery resource pool arrives through the potential competition user in broadcast notifying cell
Optimum control factor PB；
Step4.4: potential user generates a random number P after receiving broadcast at random in this equipment in cellX；
Step4.5: if PX≤PB, then the user is uncontrolled D2D user；
Step4.6: if PX> PB, then the user is controlled D2D user；
Step5: the controlled D2D user is before current dedicated discovery resource pool arrives without the random competing of Current resource
Strive, the uncontrolled D2D user current dedicated discovery resource pool arrive it is preceding according to the broadcast message of eNodeB determine into
The random competition of row Current resource；
Step6: the user and this controlled user for competing failure will continue to connect before next dedicated discovery resource pool arrives
Base station broadcast message is received, and repeats above-mentioned Step3-Step5；
Step7: the successful D2D user of random competition using the discovery that the dedicated discovery resource competed sends itself for being disappeared
Breath, other the non-selected discovery resource locations being also used in Current resource pond carry out blind examination, receive the hair of surrounding D2D user
Existing message；
The LTE-A network refers to long-term evolution upgrading network；The eNodeB refers to evolved mobile base station；The D2D refers to equipment
It is communicated to equipment.
2. D2D equipment autonomously according to claim 1 finds method, which is characterized in that the D2D for being successfully accessed cell
User also obtains the D2D reporting of user period by the broadcast message of eNodeB.
3. D2D equipment autonomously according to claim 2 finds method, which is characterized in that this method further includes following steps:
Step8: be successfully received other D2D users find the D2D user of message to its neighbor list of eNodeB periodic report, it is adjacent
Occupy the neighbor information and newfound neighbor information that list includes maintenance.
4. any D2D equipment autonomously finds method in -3 according to claim 1, which is characterized in that the dedicated hair
The running time-frequency resource of Physical Uplink Shared Channel in existing resource occupation LTE-A network.
5. D2D equipment autonomously according to claim 1 finds method, which is characterized in that this method further includes following steps:
Step9:eNodeB is in one D2D list of devices of local maintenance: if there is new D2D user to access, eNodeB will add new
D2D user information is into D2D list of devices；If certain equipment in D2D list of devices is not kept in the time threshold of setting
With the maintenance of information of eNodeB, then eNodeB will delete the information of this D2D user from D2D list of devices.
6. D2D equipment autonomously according to claim 1 finds method, which is characterized in that the discovery cycle TdGreater than one
The signal time domain length of discovery message is sent, and finds cycle TdFor the integral multiple of 1ms.
7. D2D equipment autonomously according to claim 1 finds method, which is characterized in that the potential competition user MiPacket
Include new registration user Mn, last time competition failure user MfWith last time controlled user M was not competedc, and Mi=Mn+Mf+Mc。
8. D2D equipment autonomously according to claim 1 finds method, which is characterized in that the discovery message is used comprising D2D
Device id, coding mode and the synchronization message at family.
9. D2D equipment autonomously according to claim 1 finds method, which is characterized in that the controlled user according to
Keeping out of the way often is fixed in eNodeB instruction, and back off time is 4s~512s, the user not competitive resource in back off time.
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| CN112969168B (en) * | 2021-02-08 | 2022-04-15 | 西安电子科技大学 | Method for avoiding maximum value of expected discovery delay of BLE equipment |
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| CN103891172A (en) * | 2011-08-30 | 2014-06-25 | Lg电子株式会社 | Method for supporting device-to-device communication in a cellular network, and apparatus for same |
| CN104144501A (en) * | 2013-05-09 | 2014-11-12 | 中兴通讯股份有限公司 | D2D discovery signal resource allocation method and system and related devices |
| CN105592523A (en) * | 2014-10-21 | 2016-05-18 | 中兴通讯股份有限公司 | Device discovery apparatus and device discovery method for device-to-device communication |
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