CN104684067A - Cluster head determining method and user equipment - Google Patents
Cluster head determining method and user equipment Download PDFInfo
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- CN104684067A CN104684067A CN201310627593.XA CN201310627593A CN104684067A CN 104684067 A CN104684067 A CN 104684067A CN 201310627593 A CN201310627593 A CN 201310627593A CN 104684067 A CN104684067 A CN 104684067A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- H—ELECTRICITY
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Abstract
The invention discloses a cluster head determining method and user equipment. The cluster head determining method is used by UE (User Equipment) to search a cluster head and determines whether the UE can become the cluster head; especially under the condition that a current cluster head suddenly stops working, a new cluster head can be determined so as to further provide synchronous reference. The cluster head determining method provided by the invention comprises the following steps that when needing to determine the cluster head, the UE determines the search time length for searching a cluster head special signal, wherein the cluster head special signal is a signal used for recognizing the cluster head; the UE searches the cluster head special signal in the determined search time length; when the cluster head special signal is not searched in the determined search time length, the UE is determined as the cluster head.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of bunch head defining method and subscriber equipment.
Background technology
Do not having the scene of the network coverage, certain user's equipment (User Equipment, UE) can become a bunch head, sends synchronizing signal and provides reference synchronization, to reach synchronous transmission for other UE of surrounding.When in system, original bunch of head cannot work on for some reason, in bunch, UE just loses reference synchronization, need some mechanism obtain new bunch head with continue maintain bunch in synchronous transmission.If according to the measurement of self, each UE judges whether oneself becomes a bunch head, then may occur that contiguous multiple UE become the conflict situations of bunch head simultaneously.
In traditional cellular telecommunication art, the data communication flow process between two UE as shown in Figure 1.The business such as the voice-and-data of UE1 and UE2 are carried out through evolution base station (Evolved NodeB, eNB) resident separately and core net alternately.
Equipment room (Device-to-Device, D2D) technology, namely UE leads directly to technology, refers to that contiguous UE can carry out the mode of transfer of data in short range by direct connected link, does not need to be forwarded by Centroid (i.e. base station), as shown in Figure 2.Short haul connection feature and the direct communication mode of D2D technology itself make it have following advantage:
UE carrying out direct communication in close range mode can realize higher data rate, lower delay and lower power consumption;
Utilize the short distance feature of UE and the D2D communication link of extensively distribution in network, effective utilization of frequency spectrum resource can be realized;
The local data that the direct communication mode of D2D can adapt to as business such as wireless point-to-point (Point to Point, P2P) shares demand, provides the data, services with flexible adaptation ability;
D2D direct communication can utilize substantial amounts in network and widely distributed communication UE to expand the coverage of network.
Long Term Evolution (Long Term Evolvement, LTE) D2D technology refers to that being operated in LTE authorizes the D2D by LTE network control in frequency range to find and communication process.Can give full play on the one hand the advantage of D2D technology, the control of LTE network simultaneously also can overcome some problems of traditional D2D technology, such as, disturb uncontrollable etc.The introducing of LTE D2D characteristic will make LTE technology from the simple wireless mobile cellular communication technology towards the direction evolution of " general interconnection technique " (Universal Connectivity Technology).
LTE D2D technology comprises D2D and finds to communicate with D2D two aspects, and wherein D2D finds to refer to that a D2D UE goes the communication of other D2D UE, the D2D near discovery to refer to that D2D UE and other D2D UE carries out data communication.No matter carry out finding or communicating, UE first will determine a reference synchronization, is sent or receive the time of D2D signal according to reference synchronization.
In LTE system, UE obtains the reference synchronization of downlink reception and up transmission by the downlink synchronous signal and Physical Broadcast Channel (Physical Broadcast Channel, PBCH) receiving base station transmission.Downlink synchronous signal is made up of master sync signal and auxiliary synchronous signals, uses ZC(Zradoff-chu sequence respectively) sequence and m sequence, take fixing resource location.UE is synchronous and auxiliary synchronous signals by the master of detected cells, can know the community (Cell) mark (ID) of this community, thus carry out follow-up community access procedure.PBCH is then system information and the current radio frames numbering of some communities.
Fig. 3, Fig. 4, Fig. 5 sets forth the scene of three kinds of D2D transmission: have the network coverage, cover without the network coverage and subnetwork.Having the scene of the network coverage, the method for the similar LTE system of downlink synchronous signal that UE is sent by base station obtains reference synchronization.There is no the scene of the network coverage, use identical transmission timing multiplexing to carry out orthogonal resource to make contiguous UE, some UE can become a bunch head UE, for contiguous UE provides reference synchronization, thus makes the UE in bunch use identical reference synchronization to send D2D signal.
But, also do not determine the method for bunch head in prior art, in the unexpected out-of-work situation of current cluster head, need to determine that a new bunch head continues to provide reference synchronization.
Summary of the invention
Embodiments provide a kind of bunch head defining method and subscriber equipment, find bunch head in order to UE and under determining oneself whether to become the unexpected out-of-work situation of a bunch head, particularly current cluster head, can determine that a new bunch head continues to provide reference synchronization.
The one bunch head defining method that the embodiment of the present invention provides, comprising:
When user equipment (UE) needs to determine bunch head, this UE determines length search time of searching for bunch head special signal, and wherein, described bunch of head special signal is the signal for identifying bunch head;
The search time that UE is determining searches for bunch head special signal in length;
When not searching bunch head special signal in length in the described search time determined, UE determines from as a bunch head.
Like this, UE determine one search time length, and according to bunch head special signal Search Results in search time length, judge whether to become a bunch head, achieve the determination of bunch head, and then can in the unexpected out-of-work situation of current cluster head, can determine that a new bunch head continues to provide reference synchronization.
Preferably, UE determines length search time of searching for bunch head special signal, comprising:
UE determines length search time according to the UE type of self or UE grade; Or,
The receiving intensity of bunch head special signal that the former bunch of hair that UE obtains according to measurement send determines length search time; Or,
UE determines length range search time, and foundation preset rules determines length search time of self in described search time in length range.
Like this, UE can adopt default multiple rule determine one search time length.
Preferably, UE determines length search time according to the UE type of self or UE grade, comprising:
UE determines corresponding UE priority according to the UE type of self, and according to the UE priority determined, and the UE priority preset and search time length corresponding relation, determine length search time; Or,
UE according to the UE type of self, and preset UE type and search time length corresponding relation, determine length search time; Or,
UE according to the UE grade of self, and preset UE grade and search time length corresponding relation, determine length search time.
Like this, UE can adopt default multiple rule realization to determine length search time according to the UE type of self or UE grade.
Preferably, the receiving intensity of bunch head special signal that the former bunch of hair that UE obtains according to measurement send determines length search time, comprising:
UE determines to measure the receiving intensity of bunch head special signal that former bunch of hair obtaining send, and UE is according to this receiving intensity, and the receiving intensity of bunch head special signal preset and the corresponding relation of length search time, determines length search time of correspondence.
Like this, UE can adopt default bunch head special signal receiving intensity and search time length corresponding relation, the receiving intensity realized according to measuring bunch head special signal that former bunch of hair obtaining send determines length search time.
Preferably, UE determines length range search time, and foundation preset rules determines length search time of self in described search time in length range, comprising:
UE according to the UE type of self and default UE type and search time length range corresponding relation determine length range search time, or UE according to the UE grade of self and default UE grade and search time length range corresponding relation determine length range search time; The search time that UE is determining determines length search time in Stochastic choice mode in length range, or UE according to preset UE parameter and search time length corresponding relation, the UE parameter based on self determines length search time from the search time determined in length range;
Or, the search time that UE is making an appointment determines length search time in Stochastic choice mode in length range, or UE according to preset UE parameter and search time length corresponding relation, the UE parameter based on self determines length search time from the search time of making an appointment in length range.
Like this, UE can adopt default multiple rule to realize determining length range search time, and determines self length search time according to the multiple rule preset in length range in described search time.
Preferably, UE determines that the method also comprises certainly as after bunch head:
UE sends bunch head special signal on the physical resource of agreement.
Preferably, UE sends bunch head special signal on the physical resource of agreement, comprising:
The some or all of information that bunch head special signal that the former bunch of hair received send is carried by UE sends as bunch information that head special signal is carried of oneself.
Like this, in the unexpected out-of-work situation of current cluster head, a new bunch head can be determined and continue to provide reference synchronization by sending a bunch head special signal, for around UE provides reference synchronization and other information, thus the synchronous transmission problem solved without network scenarios and bunch head the Uniqueness.
Preferably, the method also comprises:
When searching bunch head special signal in length in the described search time determined, UE determines that self does not become a bunch head, and obtains reference synchronization information based on bunch head special signal detected.
Preferably, when meeting the following conditions for the moment, UE determines that a bunch head determined by needs:
Described UE start to access community or bunch;
Described UE does not detect a bunch head special signal on the physical resource of bunch head special signal of former bunch of head;
Described UE detects a bunch head special signal.
Preferably, when UE needs to determine bunch head, the method also comprises:
This UE is using the start time point of current time as search bunch head special signal.
A kind of user equipment (UE) that the embodiment of the present invention provides, comprising:
Time length determination unit, during for determining bunch head when needs, determines length search time of searching for bunch head special signal, and wherein, described bunch of head special signal is the signal for identifying bunch head;
Search unit, for searching for bunch head special signal in the search time determined in length;
Determining unit, for when not searching bunch head special signal in length in the described search time determined, determines that described UE is bunch head.
Like this, UE determine one search time length, and according to bunch head special signal Search Results in search time length, judge whether to become a bunch head, achieve the determination of bunch head, and then can in the unexpected out-of-work situation of current cluster head, can determine that a new bunch head continues to provide reference synchronization.
Preferably, time length determination unit specifically for:
Length search time is determined according to self UE type or grade; Or,
Receiving intensity according to measuring bunch head special signal that former bunch of hair obtaining send determines length search time; Or,
Determine length range search time, foundation preset rules determines length search time of self in described search time in length range.
Like this, UE can adopt default multiple rule determine one search time length.
Preferably, time length determination unit specifically for:
Determine corresponding UE priority according to the UE type of self, and according to the UE priority determined, and the UE priority preset and search time length corresponding relation, determine length search time; Or,
According to the UE type of self, and preset UE type and search time length corresponding relation, determine length search time; Or,
According to the UE grade of self, and preset UE grade and search time length corresponding relation, determine length search time.
Like this, UE can adopt default multiple rule realization to determine length search time according to the UE type of self or UE grade.
Preferably, time length determination unit specifically for:
Determine to measure the receiving intensity of bunch head special signal that former bunch of hair obtaining send, according to this receiving intensity, and the receiving intensity of bunch head special signal preset and the corresponding relation of length search time, determine length search time of correspondence.
Like this, UE can adopt default bunch head special signal receiving intensity and search time length corresponding relation, the receiving intensity realized according to measuring bunch head special signal that former bunch of hair obtaining send determines length search time.
Preferably, time length determination unit specifically for:
According to self UE type and default UE type and search time length range corresponding relation determine length range search time, or according to self UE grade and default UE grade and search time length range corresponding relation determine length range search time; Length search time is determined in Stochastic choice mode in length range in the search time determined, or according to preset UE parameter and search time length corresponding relation, the UE parameter based on self determines length search time from the search time determined in length range;
Or, length search time is determined in Stochastic choice mode in length range in the search time of making an appointment, or according to preset UE parameter and search time length corresponding relation, the UE parameter based on self determines length search time from the search time of making an appointment in length range.
Like this, UE can adopt default multiple rule to realize determining length range search time, and determines self length search time according to the multiple rule preset in length range in described search time.
Preferably, this UE also comprises:
Transmitting element, for determining that in determining unit described UE is for after bunch head, and the physical resource of agreement sends bunch head special signal.
Preferably, transmitting element specifically for:
The some or all of information of bunch head special signal that the former bunch of hair received send being carried sends as bunch information that head special signal is carried of oneself.
Like this, in the unexpected out-of-work situation of current cluster head, a new bunch head can be determined and continue to provide reference synchronization by sending a bunch head special signal, for around UE provides reference synchronization and other information, thus the synchronous transmission problem solved without network scenarios and bunch head the Uniqueness.
Preferably, described determining unit also for:
When searching bunch head special signal in length in the described search time determined, UE determines that self does not become a bunch head, and obtains reference synchronization information based on bunch head special signal detected.
Preferably, when meeting the following conditions for the moment, described time length determination unit determines that a bunch head determined by needs:
Described UE start to access community or bunch;
Described UE does not detect a bunch head special signal on the physical resource of bunch head special signal of former bunch of head;
Described UE detects a bunch head special signal.
Preferably, described time length determination unit, when bunch head determined by needs, also for: using the start time point of current time as search bunch head special signal.
Accompanying drawing explanation
Fig. 1 is the data flow diagram of UE communication in cellular network in prior art;
Fig. 2 is the data flow diagram of the direct-connected communication of UE in prior art;
Fig. 3 has network coverage scene schematic diagram in prior art;
Fig. 4 is without network coverage scene schematic diagram in prior art;
Fig. 5 is subnetwork covering scene schematic diagram in prior art;
The schematic flow sheet of a kind of bunch of head defining method that Fig. 6 provides for the embodiment of the present invention;
The structural representation of a kind of UE that Fig. 7 provides for the embodiment of the present invention.
Embodiment
Embodiments provide a kind of bunch head defining method and subscriber equipment, in order to realize the determination of bunch head in user equipment side, particularly UE according to the rule that some is arranged determine one search time length, according to bunch head special signal Search Results in search time length, judge whether to become bunch head to send a bunch head special signal, for around UE provides reference synchronization and other information, the UE in one bunch is made to realize synchronous transmission, thus the synchronous transmission solved without network scenarios and bunch head the Uniqueness.
Provide the detailed introduction of the technical scheme that the embodiment of the present invention provides below.
Bunch head defining method that the embodiment of the present invention provides comprises three steps:
The first step: when UE needs to determine bunch head, UE adopts one of following method, determines length search time of searching for bunch head special signal.
Method one: UE determines length search time according to the UE type of self or UE grade.
UE determines corresponding UE priority according to the UE type of self, and according to the UE priority determined, and the UE priority preset and search time length corresponding relation, determine length search time.Such as, priority corresponding to UE type is higher, and search time, length was shorter.
Or, UE according to the UE type of self, and preset UE type and search time length corresponding relation, determine length search time.Such as, length search time of UE type one correspondence is length search time of T1, UE type two correspondence is T2.
Or, UE according to the UE grade of self, and preset UE grade and search time length corresponding relation, determine length search time.
Method two: UE determines to measure the receiving intensity of bunch head special signal that former bunch of hair obtaining send, and UE is according to this receiving intensity, and the receiving intensity of bunch head special signal preset and the corresponding relation of length search time, determines length search time of correspondence.Such as, correspond to length search time according to quantification gradation after measuring the receiving intensity quantification of bunch head special signal obtained, intensity is larger, and search time is shorter.Based on this method, the UE nearer apart from former bunch of head more has an opportunity to become new bunch of head, thus can reduce and change bunch head to bunch impact covered.
Method three: UE determines length range search time, and foundation preset rules determines length search time of self in described search time in length range.
Can the corresponding relation (also can not have this corresponding relation but use length range predefined search time) of preset search time span scope and UE type or grade, different UEs type or length range search time corresponding to grade are made an appointment.Namely UE according to the UE type of self and default UE type and search time length range corresponding relation determine length range search time, or UE according to the UE grade of self and default UE grade and search time length range corresponding relation determine length range search time; The search time that UE is determining determines length search time in Stochastic choice mode in length range, or UE according to preset UE parameter and search time length corresponding relation, the UE parameter based on self determines length search time from the search time determined in length range.Such as, length range search time of UE type one correspondence is [0, T1], and length range search time of UE type two correspondence is [T1, T2].UE determines length search time of self after determining length range corresponding search time according to own type or grade according to certain rule.Particularly, the search time that UE is determining determines length search time in the mode of Stochastic choice in length range, and all possible search time of UE in search time length range be Stochastic choice one length search time in length value; Or, UE according to the UE parameter of making an appointment and search time length corresponding relation, UE parameter based on self determines length search time from the search time determined in length range, wherein, UE parameter can be the D2D ID of UE, the parameters such as the International Mobile Station Equipment Identification (International Mobile Equipment Identity, IMEI) of UE.Such as, search time length t=K mod (T2-T1+1)+T1, wherein K be the D2D ID of UE, T1 and T2 be respectively determine search time length range minimum and maximum length search time.
Or, length range search time of UE is made an appointment, in this length range, determine length search time of self according to certain rule search time, namely the search time that UE is making an appointment determines length search time in Stochastic choice mode in length range, or UE according to preset UE parameter and search time length corresponding relation, UE parameter based on self determines length search time from the search time of making an appointment in length range, specifically comprises:
UE determines search time length in the mode of Stochastic choice in the search time of agreement in length range; Concrete, UE is in institute in length range search time of agreement likely Stochastic choice time span in time span value; Or
UE according to the UE parameter of making an appointment and search time length corresponding relation, the UE parameter based on self determines length search time from the search time of making an appointment in length range, and wherein UE parameter can be the D2D ID of UE, the parameters such as the IMEI of UE.Such as, search time length t=K mod (T2-T1+1)+T1, wherein K be the D2D ID of UE, T1 and T2 be respectively agreement search time length range minimum and maximum length search time.
Wherein, method one and the UE type described in method three at least comprise the dissimilar UE determined according to following either type:
Whether can receive synchronizing signal or the synchronizing channel (being a type when being, is again a type in situation that no, lower same) of base station transmission;
Whether can receive the broadcast channel that base station sends;
Whether can receive the synchronizing signal that independent bunch of hair send;
Whether can receive a bunch head special signal;
Whether can be synchronous with global positioning system (Global Positioning System, GPS);
Whether there is scheduling of resource ability.
Wherein, method one and the UE grade described in method three at least comprise the UE grade adopting following either type to determine:
According to obtaining the UE grade that lock in time, length divided;
According to the UE grade that different service quality (Quality of Service, QoS) determines;
According to the UE grade that D2D ID or application divide;
According to the UE grade that the power consumption ability to bear of UE divides.
Wherein, described search time, length can be bunch multiple in the cycle of head special signal, and, further can also using this multiple as the unit characterizing length search time, such as: when search time, length was 1, expression length search time is specially 1 times of bunch cycle of head special signal, when search time, length was 2, expression length search time is specially 2 times of bunch cycle of head special signal, by that analogy.
Wherein, when meeting the following conditions for the moment, UE determines that a bunch head determined by needs:
Condition one: UE start to access community or bunch;
Such as, UE enters communications status or opens certain needs certain communication functions (such as D2D) of bunch head, by start to carry out community or bunch search, now need first to determine a bunch head, UE is using the start time point of time point now as search window.
Condition two: UE does not detect a bunch head special signal on the physical resource of bunch head special signal of former bunch of head;
Such as, UE continues to detect respective cluster head special signal (such as on bunch physical resource that head special signal is used of former bunch of head, detect on fixing running time-frequency resource with the fixed cycle), when certain cycle UE does not detect this bunch of head special signal, then need to redefine a bunch head, UE is using the start time point of time point now as search window, and now UE enters the process of search bunch head special signal, namely starts to perform the above-mentioned first step.
Condition three: UE detects a bunch head special signal;
Such as, after UE completes the detection of primary cluster head special signal, UE, using the start time point of current time point as search window, starts to search for the upper bunch head special signal once sent of this bunch of head in length in search time, to determine whether this bunch of head still exists or whether change.
The search time that second step: UE is determining detects bunch head special signal in length.
UE detects bunch head special signal on the physical resource of agreement;
Before searching bunch head special signal, UE still can carry out transmission and/or the reception of signal according to the reference synchronization obtained from original bunch head, or does not carry out transmission and/or the reception of signal.
UE can all bunches of head special signals in search system, bunch head special signal that bunch hair also only can searching for some particular UE type send.Such as, UE only can search for bunch head special signal that independent bunch of hair send, and does not search for bunch head special signal of UE forwarding, also can all search for by two kinds of signals; UE only can search for bunch head special signal that bunch hair with scheduling of resource ability send, and does not search for bunch head special signal that other bunch of hair send, and also can all search for by two kinds of signals.
3rd step: UE determines whether become a bunch head according to testing result, and after being determined to become bunch head, sends bunch head special signal.
If UE detects target bunch head special signal in second step, then according to bunch head special signal detected, obtain reference synchronization.
If UE does not detect target bunch head special signal in search time in length, then determine oneself to become a bunch head, and send bunch head special signal on the physical resource of agreement.Particularly, bunch head special signal that original bunch hair can send by the UE some or all of information of carrying sends as bunch information that head special signal is carried of oneself, also can add other information according to inherent parameters.
Bunch head special signal described in the embodiment of the present invention is the signal for identifying bunch head, and bunch head special signal that in the embodiment of the present invention, UE sends, can comprise the information such as synchronizing signal, synchronizing channel, broadcast channel.Wherein, synchronizing signal and synchronizing channel are used for providing reference synchronization for receiving terminal; Synchronizing channel or broadcast channel can carry subframe numbering, radio frames numbering, bunch head UE information, bandwidth information, bunch information etc.Bunch head special signal can only be sent by an independently bunch hair, also can be forwarded by the particular UE receiving this bunch of head special signal.
Exemplify several specific embodiment below.
Embodiment one:
UE opens D2D function, and determines length search time, and described search time, length was determined according to the UE type of UE.Such as, UE type and search time length corresponding relation as follows:
| UE type | Search time length |
| There is the UE of dispatching | 10ms |
| The UE synchronous with GPS | 50ms |
| Other UE | 100ms |
Suppose that this UE is the UE synchronous with GPS, then search time, length was 50ms accordingly.
UE detects in the search time determined bunch head special signal that bunch hair send in length, and described bunch of head special signal comprises the synchronizing signal periodically sent, and with the fixed physical transmitted over resources of the cycle of agreement in agreement.UE only needs to detect whether there is synchronizing signal in the bandwidth of agreement.Such as, UE travels through all possible synchronizing sequence and carries out relevant to Received signal strength, determines whether there is synchronizing signal according to correlated results.
If UE does not detect a bunch head special signal in search time in length, then determine oneself to become a bunch head, and send bunch head special signal with the cycle of agreement in the fixed physical resource of agreement.Described bunch of head special signal generates serial ID used and is determined by UE oneself.
If UE detects certain bunch of head special signal in search time in length, then obtain synchronous reference signal according to bunch head special signal detected.
UE always according to the synchronous reference signal of this bunch of head special signal tracking cluster head, in this, as sending and/or receive the reference synchronization of other signals.
Embodiment two:
UE receives bunch head special signal that certain bunch of hair send in the fixed physical resource of agreement, and described bunch of head special signal comprises the synchronizing signal periodically sent, and the cycle makes an appointment, and UE obtains reference synchronization from synchronizing signal;
Bunch head special signal that UE is not receiving this bunch of hair sometime and send, then enter following search procedure;
Determine length search time, described search time, length was determined according to the average reception intensity of bunch head special signal measuring the original bunch head obtained, the receiving intensity of bunch head special signal and search time length corresponding relation can make an appointment.Such as, bunch head special signal receiving intensity and search time length corresponding relation as follows:
Suppose that the average reception intensity of bunch head special signal that this UE receives is between a to b, then search time, length was 5 bunches of head special signal cycles accordingly.
Wherein, a, b, k are the default number being greater than 0.
UE detects in the search time determined bunch head special signal that bunch hair send in length in the fixed physical resource of agreement, and UE only needs to detect whether there is synchronizing signal in the bandwidth of agreement.Such as, UE travels through all possible synchronizing sequence and carries out relevant to Received signal strength, determines whether there is synchronizing signal according to correlated results.
If UE does not detect a bunch head special signal in search time in length, then determine oneself to become a bunch head, and send bunch head special signal with the cycle of agreement in the fixed physical resource of agreement.Described bunch of head special signal is also synchronizing signal, identical with bunch head special signal that original bunch hair that it receives send (comprising running time-frequency resource used).
If in search time, UE detects in length that certain bunch of head special signal (may be and bunch signal that head special signal is identical received before, also can be the different bunch head special signal that another one bunch hair send), then obtain synchronous reference signal according to bunch head special signal detected.
UE carries out the transmitting-receiving of other signals according to the new synchronous reference signal obtained.
Embodiment three:
UE receives bunch head special signal that certain bunch of hair send in the fixed physical resource of agreement, described bunch of head special signal comprises the synchronizing signal and synchronizing channel that periodically send, cycle makes an appointment, and UE obtains reference synchronization from synchronizing signal and synchronizing channel.Wherein, in synchronizing signal, comprise synchronizing sequence, and in synchronizing channel, comprise radio frames numbering.
Bunch head special signal that UE is not receiving this bunch of hair sometime and send, then enter following search procedure:
UE length range search time according to a preconcerted arrangement determines length search time.Concrete, UE determines search time length in the mode of Stochastic choice in the search time of agreement in length range.Such as, length range search time of agreement is 1-50 bunch head special signal cycle, then UE Stochastic choice one value from 1-50, determines length search time in units of bunch head special signal cycle;
UE detects in the search time determined bunch head special signal that bunch hair send in length in the fixed physical resource of agreement.First UE detects whether there is synchronizing signal in the bandwidth of agreement.Such as, UE travels through all possible synchronizing sequence and carries out relevant to Received signal strength, determines whether there is synchronizing signal according to correlated results.If there is synchronizing signal, then detect the corresponding synchronizing channel of synchronizing signal according to fixing resource mapping relation.If synchronizing signal and corresponding synchronizing channel detected, then think and a bunch head special signal detected, otherwise for not detect.
If UE does not detect a bunch head special signal in search time in length, then determine oneself to become a bunch head, and send bunch head special signal with the cycle of agreement in the fixed physical resource of agreement.Described bunch of head special signal also comprises synchronizing signal and synchronizing channel, and wherein synchronizing signal is identical with the synchronizing signal that the first prevariety hair received before send, but the radio frames numbering in synchronizing channel is determined according to the timing of UE oneself.
If in search time, UE detects in length that certain bunch of head special signal (may be and bunch signal that head special signal is identical received before, also can be the different bunch head special signal that another one bunch hair send), then obtain reference synchronization according to bunch head special signal detected.
To sum up, see Fig. 6, the one bunch head defining method that the embodiment of the present invention provides, comprising:
S101, when user equipment (UE) needs to determine bunch head, this UE determines length search time of searching for bunch head special signal, and wherein, described bunch of head special signal is the signal for identifying bunch head;
The search time that S102, UE are determining searches for bunch head special signal in length;
S103, when not searching bunch head special signal in length in the described search time determined, UE determines from as a bunch head.
See Fig. 7, a kind of user equipment (UE) that the embodiment of the present invention provides, comprising:
Time length determination unit 11, during for determining bunch head when needs, determines length search time of searching for bunch head special signal, and wherein, described bunch of head special signal is the signal for identifying bunch head;
Search unit 12, for searching for bunch head special signal in the search time determined in length;
Determining unit 13, for when not searching bunch head special signal in length in the described search time determined, determines that described UE is bunch head.
Preferably, time length determination unit 11, search unit 12 and determining unit 13 can be the devices such as processor.
Preferably, this UE also comprises:
Transmitting element 14, for determining that in determining unit described UE is for after bunch head, and the physical resource of agreement sends bunch head special signal.
Preferably, transmitting element 14 can be the devices such as reflector.
In sum, invention describes a kind of bunch head defining method, UE according to the rule that some is arranged determine one search time length, according to bunch head special signal Search Results in search time length, judge whether to become bunch head to send a bunch head special signal, for around UE provides reference synchronization and other information, thus the synchronous transmission solved without network scenarios and bunch head the Uniqueness.
By the program, though bunch in former bunch of head process so quit work, also can generate new bunch head within a certain period of time, thus the phase mutually synchronization of UE in ensureing bunch, the UE type that higher grade can also preferentially become a bunch head.And, thus method obtain bunch first as be unique, avoid occurring that multiple UE becomes bunch head and situation about mutually disturbing simultaneously.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (26)
1. a bunch head defining method, it is characterized in that, the method comprises:
When user equipment (UE) needs to determine bunch head, this UE determines length search time of searching for bunch head special signal, and wherein, described bunch of head special signal is the signal for identifying bunch head;
The search time that UE is determining searches for bunch head special signal in length;
When not searching bunch head special signal in length in the described search time determined, UE determines from as a bunch head.
2. method according to claim 1, is characterized in that, UE determines length search time of searching for bunch head special signal, comprising:
UE determines length search time according to the UE type of self or UE grade; Or,
The receiving intensity of bunch head special signal that the former bunch of hair that UE obtains according to measurement send determines length search time; Or,
UE determines length range search time, and foundation preset rules determines length search time of self in described search time in length range.
3. method according to claim 2, is characterized in that, UE determines length search time according to the UE type of self or UE grade, comprising:
UE determines corresponding UE priority according to the UE type of self, and according to the UE priority determined, and the UE priority preset and search time length corresponding relation, determine length search time; Or,
UE according to the UE type of self, and preset UE type and search time length corresponding relation, determine length search time; Or,
UE according to the UE grade of self, and preset UE grade and search time length corresponding relation, determine length search time.
4. method according to claim 2, is characterized in that, the receiving intensity of bunch head special signal that the former bunch of hair that UE obtains according to measurement send determines length search time, comprising:
UE determines to measure the receiving intensity of bunch head special signal that former bunch of hair obtaining send, and UE is according to this receiving intensity, and the receiving intensity of bunch head special signal preset and the corresponding relation of length search time, determines length search time of correspondence.
5. method according to claim 2, is characterized in that, UE determines length range search time, and foundation preset rules determines length search time of self in described search time in length range, comprising:
UE according to the UE type of self and default UE type and search time length range corresponding relation determine length range search time, or UE according to the UE grade of self and default UE grade and search time length range corresponding relation determine length range search time; The search time that UE is determining determines length search time in Stochastic choice mode in length range, or UE according to preset UE parameter and search time length corresponding relation, the UE parameter based on self determines length search time from the search time determined in length range;
Or, the search time that UE is making an appointment determines length search time in Stochastic choice mode in length range, or UE according to preset UE parameter and search time length corresponding relation, the UE parameter based on self determines length search time from the search time of making an appointment in length range.
6. the method according to claim 2,3 or 5, is characterized in that, described UE type, at least comprises the dissimilar UE adopting one of following manner to determine:
Whether can receive synchronizing signal or the synchronizing channel of base station transmission;
Whether can receive the broadcast channel that base station sends;
Whether can receive the synchronizing signal that independent bunch of hair send;
Whether can receive a bunch head special signal;
Whether can be synchronous with global position system GPS;
Whether there is scheduling of resource ability.
7. the method according to claim 2,3 or 5, is characterized in that, described UE grade, at least comprises the UE grade adopting one of following manner to determine:
According to obtaining the UE grade that lock in time, length divided;
According to the UE grade that different service quality QoS determines;
According to the UE grade that equipment room mark D2D ID or application divide;
According to the UE grade that the power consumption ability to bear of UE divides.
8. method according to claim 1, is characterized in that, the search time that UE is determining searches for bunch head special signal in length, comprising:
Bunch head special signals all in UE search system; Or
Bunch head special signal that bunch hair that UE only searches for particular UE type send.
9. method according to claim 1, is characterized in that, UE determines that the method also comprises certainly as after bunch head:
UE sends bunch head special signal on the physical resource of agreement.
10. method according to claim 9, is characterized in that, UE sends bunch head special signal on the physical resource of agreement, comprising:
The some or all of information that bunch head special signal that the former bunch of hair received send is carried by UE sends as bunch information that head special signal is carried of oneself.
11. methods according to claim 1, it is characterized in that, the method also comprises:
When searching bunch head special signal in length in the described search time determined, UE determines that self does not become a bunch head, and obtains reference synchronization information based on bunch head special signal detected.
12. methods according to claim 1, is characterized in that, when meeting the following conditions for the moment, UE determines that a bunch head determined by needs:
Described UE start to access community or bunch;
Described UE does not detect a bunch head special signal on the physical resource of bunch head special signal of former bunch of head;
Described UE detects a bunch head special signal.
13. methods according to claim 1, is characterized in that, when UE needs to determine bunch head, the method also comprises:
This UE is using the start time point of current time as search bunch head special signal.
14. 1 kinds of user equipment (UE)s, is characterized in that, this UE comprises:
Time length determination unit, during for determining bunch head when needs, determines length search time of searching for bunch head special signal, and wherein, described bunch of head special signal is the signal for identifying bunch head;
Search unit, for searching for bunch head special signal in the search time determined in length;
Determining unit, for when not searching bunch head special signal in length in the described search time determined, determines that described UE is bunch head.
15. UE according to claim 14, is characterized in that, time length determination unit specifically for:
Length search time is determined according to self UE type or grade; Or,
Receiving intensity according to measuring bunch head special signal that former bunch of hair obtaining send determines length search time; Or,
Determine length range search time, foundation preset rules determines length search time of self in described search time in length range.
16. UE according to claim 15, is characterized in that, time length determination unit specifically for:
Determine corresponding UE priority according to the UE type of self, and according to the UE priority determined, and the UE priority preset and search time length corresponding relation, determine length search time; Or,
According to the UE type of self, and preset UE type and search time length corresponding relation, determine length search time; Or,
According to the UE grade of self, and preset UE grade and search time length corresponding relation, determine length search time.
17. UE according to claim 15, is characterized in that, time length determination unit specifically for:
Determine to measure the receiving intensity of bunch head special signal that former bunch of hair obtaining send, according to this receiving intensity, and the receiving intensity of bunch head special signal preset and the corresponding relation of length search time, determine length search time of correspondence.
18. UE according to claim 15, is characterized in that, time length determination unit specifically for:
According to self UE type and default UE type and search time length range corresponding relation determine length range search time, or according to self UE grade and default UE grade and search time length range corresponding relation determine length range search time; Length search time is determined in Stochastic choice mode in length range in the search time determined, or according to preset UE parameter and search time length corresponding relation, the UE parameter based on self determines length search time from the search time determined in length range;
Or, length search time is determined in Stochastic choice mode in length range in the search time of making an appointment, or according to preset UE parameter and search time length corresponding relation, the UE parameter based on self determines length search time from the search time of making an appointment in length range.
19. UE according to claim 15,16 or 18, is characterized in that, described UE type, at least comprise the dissimilar UE adopting one of following manner to determine:
Whether can receive synchronizing signal or the synchronizing channel of base station transmission;
Whether can receive the broadcast channel that base station sends;
Whether can receive the synchronizing signal that independent bunch of hair send;
Whether can receive a bunch head special signal;
Whether can be synchronous with global position system GPS;
Whether there is scheduling of resource ability.
20. UE according to claim 15,16 or 18, is characterized in that, described UE grade, at least comprise the UE grade adopting one of following manner to determine:
According to obtaining the UE grade that lock in time, length divided;
According to the UE grade that different service quality QoS determines;
According to the UE grade that equipment room mark D2D ID or application divide;
According to the UE grade that the power consumption ability to bear of UE divides.
21. UE according to claim 14, is characterized in that, search unit specifically for:
Bunch head special signals all in search system; Or
Bunch head special signal that bunch hair only searching for particular UE type send.
22. UE according to claim 14, is characterized in that, this UE also comprises:
Transmitting element, for determining that in determining unit described UE is for after bunch head, and the physical resource of agreement sends bunch head special signal.
23. UE according to claim 22, is characterized in that, transmitting element specifically for:
The some or all of information of bunch head special signal that the former bunch of hair received send being carried sends as bunch information that head special signal is carried of oneself.
24. UE according to claim 14, is characterized in that, described determining unit also for:
When searching bunch head special signal in length in the described search time determined, UE determines that self does not become a bunch head, and obtains reference synchronization information based on bunch head special signal detected.
25. UE according to claim 14, is characterized in that, when meeting the following conditions for the moment, described time length determination unit determines that a bunch head determined by needs:
Described UE start to access community or bunch;
Described UE does not detect a bunch head special signal on the physical resource of bunch head special signal of former bunch of head;
Described UE detects a bunch head special signal.
26. UE according to claim 14, is characterized in that, described time length determination unit, when bunch head determined by needs, also for: using the start time point of current time as search bunch head special signal.
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