CN103179669B - The resource allocation methods of D2D communication in a kind of long evolving system - Google Patents
The resource allocation methods of D2D communication in a kind of long evolving system Download PDFInfo
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Abstract
The invention discloses the resource allocation methods of D2D communication in a kind of long evolving system, comprise (1) D2D user UE1 and send D2D device discovery signal to base station; (2) geographical position measurement is carried out in base station, to the UE list of UE1 layback UE1<R; (3) if object UE 2 is in the scope of UE1, UE1 measures to base station application D2D link; (4) resource of carrying out needed for link measurement is distributed for UE1 in base station; (5) UE1 sends link measuring-signal to UE2, and by information feed back such as the SINR of measurement to base station, reports the transmission rate request wanted simultaneously; (6) content that reports according to UE1 of base station, estimation PRB number is D2D allocation of communications resource; (7) UE1 with UE2 starts D2D and communicates.The D2D resource allocation methods of the present invention's design, considers the rate requirement of user, considers the interference between phone user and D2D user simultaneously, and the RB number that show in particular multiplexing phone user's resource calculates, and improves user satisfaction and the level of resources utilization.
Description
Technical field
The present invention relates to communication technical field, be specifically related to one and be applied in long evolving system the resource allocation methods that equipment straight-through (Device-to-Device is called for short D2D) communicates.
Background technology
Along with the development of mobile communication, the continuous increase of telex network demand, needs the new technology of research on the basis of Long Term Evolution (Long Term Evolution is called for short LTE), to provide higher data rate and power system capacity to meet.Straight-through (the Device-to-Device of equipment of introducing in LTE system, being called for short D2D) communication technology just arises at the historic moment, the D2D communication technology changes the original communication mode forwarded by base station as the direct communication between the equipment needing communication in simple terms exactly, but base station still with the transmission of a pair user's retentive control information of D2D, realize interference to control, the functions such as charging, and be D2D user resource allocation, make D2D communication work in licensed band, relative to other technology (bluetooth of non-licensed band, WLAN), the interference between phone user and D2D user is coordinated.The D2D communication technology has the following advantages: because data do not need the switching by base station, but direct transfer between user, D2D technology decreases the burden of base station communication, saves the shared communication resource; D2D user can the resource of multiplexing phone user, thus traffic rate and spectrum efficiency are improved greatly; Because D2D is used for short-range communication, terminal transmit power is compared honeycomb mode and is reduced to some extent, and therefore D2D communication can also reduce the battery consumption of mobile terminal; As long as the control signal module of base station is errorless can support transmission, thus D2D communication can improve the robustness of network infrastructure fault simultaneously.Therefore, the D2D communication based on cellular system received extensive concern in recent years.
Based in the D2D communication technology of cellular communication, if give D2D user to distributing the resource orthogonal with other phone user, then interference can not be caused between D2D user couple and phone user, but in today of frequency resource growing tension, this method not easily realizes, the resource of the multiplexing phone user of D2D user is then trend of the times, but so, will produce interference between phone user and D2D user.And the service quality of user is also the key factor of a measurement system quality, consider the data rate of D2D user here.So, how under the requirement meeting D2D data rate, be rationally D2D Resources allocation, reduces the interference between D2D user and phone user, the resource utilization of raising system?
At present, for D2D Resources allocation mainly considers two kinds of situations: in the situation that cell load is lighter, for D2D distributes the resource orthogonal with phone user; In the situation that cell load is heavier, the resource of the multiplexing phone user of D2D user.In order to reduce the interference of D2D user and phone user, common are the methods such as the resource selecting multiplexed resource based on customer location and avoid user that multiplexing interference is larger.As, number of patent application 201110007220.3, publication number CN102123496A, name of patent application is: a kind of D2D user based on architecture is to the method for multiplexing phone user's resource, the method is mainly by carrying out resource multiplex for its phone user farthest of D2D user's chosen distance, simplify the complexity selecting multiplexed resource, also reduce the interference between phone user and D2D user simultaneously.But, do not specifically note in this application multiplexed resource time, specifically how to select the multiplexing of Resource Block (Resource Block, be called for short RB), the Resource Block of multiplexing how many numbers.In addition, article " Effective InterferenceCancellation Scheme for Device-to-Device CommunicationUnderlaying Cellular Networks " (meeting of Vehicular TechnologyConference Fall(vehicle technology. autumn), specifically propose in 3rd page, base station is by detecting Common Control Channel (Common Control Channel, be called for short CCCH), define the potential phone user that may become near-far interference, and inform D2D user when Resourse Distribute, such D2D user just can avoid these resources to when multiplexed resource.But this article does not consider the rate requirement of D2D user, Resources allocation can not be needed according to user, not make full use of resource.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of D2D subscriber equipment for different business is proposed, estimation meets the Physical Resource Block number of its rate requirement at least needs, choose reasonable which phone user's resource multiplexing, while reducing the interference between phone user and D2D user, improve the utilization ratio of resource, reduce unnecessary waste.
For achieving the above object, the technical solution used in the present invention is as follows:
A resource allocation methods for D2D communication in long evolving system, comprises the mutual communication equipment of direct communication, and holds two end subscribers of described communication equipment, said method comprising the steps of:
(1) end subscriber holding described communication equipment sends the discovery signal of mutual communication equipment to base station, wherein, described discovery signal comprises the Radio Network Temporary Identifier of a described end subscriber in scope;
(2) geographical position detection is carried out in described base station, wherein, described base station obtains the geographical location information of a described end subscriber according to architecture or GPS or auxiliary A-GPS, records and the user list of a described end subscriber in same scope to described one end user feedback one simultaneously;
(3) when described other end user is in the scope of a described end subscriber, then a described end subscriber is measured to the link of the mutual communication equipment of described base station application direct communication;
(4) resource of carrying out required for link measurement is distributed for a described end subscriber in base station;
(5) a described end subscriber sends link measuring-signal to described other end user, and gives described base station by measurement feedback, simultaneously to the requirement of described base station upload transfers speed;
(6) described base station is according to described measurement result, analyzes the rate requirement of described two end subscribers simultaneously, draws the Physical Resource Block required for mutual communication equipment of described direct communication, distributes to described two end subscribers;
(7), after completing the distribution of described Physical Resource Block, described two end subscribers start direct communication.
It should be noted that, described user list comprises geographical position, and distance between a described end subscriber and described Radio Network Temporary Identifier.
It should be noted that, described link measurement comprises Signal to Interference plus Noise Ratio (being called for short SINR), wherein, the computing formula of SINR is in channel quality instruction (being called for short CQI):
Wherein, P
orepresent the transmitting power of measuring-signal, PL
drepresent the path loss of D2D link, N represents noise, P
irepresent the transmitting power of phone user i, PL
idrepresent the path loss of phone user i to D2D user.
As the preferred scheme of one, the step of described distribution Physical Resource Block comprises:
(1) if scope internal burden is less, available free resource, and idling-resource number is greater than the number of the Physical Resource Block drawn, then the resource required for distributing directly to described two end subscribers;
(2) if there is no idling-resource in scope, the resource of the multiplexing phone user of mutual communication equipment of described direct communication, wherein, the resource of the described two multiplexing users of end subscribers possibility, the also resource of the multiplexing multiple user of possibility.
What be necessary explanation is, the method that the estimation of described Physical Resource Block number is carried out according to user rate requirements in described base station is: described base station is according to described measurement result, operable modulation coding mode MCS grade is selected according to above-mentioned SINR, wherein the corresponding relation of SINR and MCS, obtains by l-G simulation test.Then can table look-up 7.1.7.1-1 in 3GPP agreement TS36.213, finds the transport block size index TBS Index that modulation coding mode index MCS Index is corresponding.Again according to the rate requirement of D2D user, TBS Index, finds that value immediate with the value of rate requirement, the corresponding number obtaining Physical Resource Block in table 7.1.7.2.1-1.The Physical Resource Block giving user should be N
pRB+ M, wherein, M is the Physical Resource Block considering that actual conditions should additionally consume.
As the preferred scheme of one, the step of described multiplexing phone user's resource comprises:
(1) retrieval and a described end subscriber disturb the first minimum honeycomb mode subscriber equipment;
(2) draw the data rate of each Physical Resource Block of the first honeycomb mode subscriber equipment, thus draw multiplexing how many described Physical Resource Block of the speed needs meeting described two end subscribers;
(3) according to the Physical Resource Block of the number drawn, the mutual communication equipment of described direct communication is distributed.
It should be noted that, when all Resource Block of multiplexing first honeycomb mode subscriber equipment all do not reach the rate requirement of mutual communication equipment of described direct communication, then whole Physical Resource Block of the first honeycomb mode subscriber equipment are given a described end subscriber, then retrieval is next disturbs the second minimum honeycomb mode subscriber equipment with described other end user, draw the data rate of each Physical Resource Block of the second honeycomb mode subscriber equipment, show that multiplexing second honeycomb mode subscriber equipment needs how many Physical Resource Block can meet the rate requirement of described two end subscribers again, wherein, until meet a described end subscriber rate requirement or reached a described end subscriber can multiplexed physical number of resource blocks object maximum.
Beneficial effect of the present invention is: the method considers the rate requirement of user, consider the interference between phone user and D2D user simultaneously, the RB number that show in particular multiplexing phone user's resource calculates, the part resource of the multiplexing phone user's resource of choose reasonable or multiple phone user's resource or a multiplexing phone user, while ensureing the interference level between phone user and D2D user, improve user satisfaction, the utilization ratio of resource is also greatly improved.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention;
Fig. 2 is the position view of the straight-through multiplexing phone user of devices communicating in the present invention;
Fig. 3 is the resource block number schematic diagram that in the present invention, straight-through devices communicating selects phone user.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.As shown in Figure 1, the present invention is the resource allocation methods of D2D communication in a kind of long evolving system, comprises the mutual communication equipment of direct communication, and holds two end subscribers of described communication equipment, said method comprising the steps of:
(1) end subscriber holding described communication equipment sends the discovery signal of mutual communication equipment to base station, wherein, described discovery signal comprises the Radio Network Temporary Identifier of a described end subscriber in scope;
(2) geographical position detection is carried out in described base station, wherein, described base station obtains the geographical location information of a described end subscriber according to architecture or GPS or auxiliary A-GPS, records and the user list of a described end subscriber in same scope to described one end user feedback one simultaneously;
(3) when described other end user is in the scope of a described end subscriber, then a described end subscriber is measured to the link of the mutual communication equipment of described base station application direct communication;
(4) resource of carrying out required for link measurement is distributed for a described end subscriber in base station;
(5) a described end subscriber sends link measuring-signal to described other end user, and gives described base station by measurement feedback, simultaneously to the requirement of described base station upload transfers speed;
(6) described base station is according to described measurement result, analyzes the rate requirement of described two end subscribers simultaneously, draws the Physical Resource Block required for mutual communication equipment of described direct communication, distributes to described two end subscribers;
(7), after completing the distribution of described Physical Resource Block, described two end subscribers start direct communication.
It should be noted that, described user list comprises geographical position, and distance between a described end subscriber and described Radio Network Temporary Identifier.
As shown in Figure 2 and Figure 3, the step of described multiplexing phone user's resource comprises:
(1) retrieval and a described end subscriber (UE1) disturb the first minimum honeycomb mode subscriber equipment (CUE1);
(2) draw the data rate of each Physical Resource Block of the first honeycomb mode subscriber equipment (CUE1), thus draw multiplexing how many described Physical Resource Block of the speed needs meeting described two end subscribers;
(3) according to the Physical Resource Block of the number drawn, the mutual communication equipment of described direct communication is distributed.
It should be noted that, when all Resource Block of multiplexing first honeycomb mode subscriber equipment (CUE1) all do not reach the rate requirement of mutual communication equipment of described direct communication, then whole Physical Resource Block of the first honeycomb mode subscriber equipment (CUE1) are given a described end subscriber (UE1), then retrieval is next disturbs the second minimum honeycomb mode subscriber equipment (CUE2) with described other end user (UE2), draw the data rate of each Physical Resource Block of the second honeycomb mode subscriber equipment (CUE2), show that multiplexing second honeycomb mode subscriber equipment (CUE2) needs how many Physical Resource Block can meet the rate requirement of described two end subscribers again, wherein, until meet a described end subscriber (UE1) rate requirement or reached a described end subscriber (UE1) can multiplexed physical number of resource blocks object maximum.
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection range of the claims in the present invention.
Claims (5)
1. a resource allocation methods for D2D communication in long evolving system, comprises the mutual communication equipment of direct communication, and holds two end subscribers of described communication equipment, it is characterized in that, said method comprising the steps of:
(1) end subscriber holding described communication equipment sends the discovery signal of mutual communication equipment to base station, wherein, described discovery signal comprises the Radio Network Temporary Identifier of a described end subscriber in scope;
(2) geographical position detection is carried out in described base station, wherein, described base station obtains the geographical location information of a described end subscriber according to architecture or GPS or auxiliary A-GPS, records and the user list of a described end subscriber in same scope to described one end user feedback one simultaneously;
(3) when other end user is in the scope of a described end subscriber, then a described end subscriber is measured to the link of the mutual communication equipment of described base station application direct communication;
(4) resource of carrying out required for link measurement is distributed for a described end subscriber in base station;
(5) a described end subscriber sends link measuring-signal to described other end user, and gives described base station by measurement feedback, simultaneously to the requirement of described base station upload transfers speed;
(6) described base station is according to described measurement result, analyzes the rate requirement of described two end subscribers simultaneously, draws the Physical Resource Block required for mutual communication equipment of described direct communication, distributes to described two end subscribers;
(7), after completing the distribution of described Physical Resource Block, described two end subscribers start direct communication.
2. resource allocation methods according to claim 1, is characterized in that, described user list comprises geographical position, the distance between other users and a described end subscriber and Radio Network Temporary Identifier.
3. resource allocation methods according to claim 1, is characterized in that: the step of described distribution Physical Resource Block comprises:
(1) if scope internal burden is less, available free resource, and idling-resource number is greater than the number of the Physical Resource Block drawn, then the resource required for distributing directly to described two end subscribers;
(2) if there is no idling-resource in scope, the resource of the multiplexing phone user of mutual communication equipment of described direct communication, wherein, the resource of the described two multiplexing users of end subscribers possibility, the also resource of the multiplexing multiple user of possibility.
4. resource allocation methods according to claim 3, is characterized in that, the step of described multiplexing phone user's resource comprises:
(1) retrieval and a described end subscriber disturb the first minimum honeycomb mode subscriber equipment;
(2) draw the data rate of each Physical Resource Block of described first honeycomb mode subscriber equipment, thus draw multiplexing how many described Physical Resource Block of the speed needs meeting described two end subscribers;
(3) according to the Physical Resource Block of the number drawn, the mutual communication equipment of described direct communication is distributed.
5. resource allocation methods according to claim 3, it is characterized in that, when all Resource Block of multiplexing described first honeycomb mode subscriber equipment all do not reach the rate requirement of mutual communication equipment of described direct communication, then whole Physical Resource Block of described first honeycomb mode subscriber equipment are given a described end subscriber, then retrieval is next disturbs the second minimum honeycomb mode subscriber equipment with described other end user, draw the data rate of each Physical Resource Block of described second honeycomb mode subscriber equipment, show that multiplexing described second honeycomb mode subscriber equipment needs how many Physical Resource Block can meet the rate requirement of described two end subscribers again, wherein, until meet a described end subscriber rate requirement or reached a described end subscriber can multiplexed physical number of resource blocks object maximum.
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