CN106304257A - Select UE to the method for the relaying of network with for relaying the synchronous method of discovery - Google Patents

Select UE to the method for the relaying of network with for relaying the synchronous method of discovery Download PDF

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Publication number
CN106304257A
CN106304257A CN201510250245.4A CN201510250245A CN106304257A CN 106304257 A CN106304257 A CN 106304257A CN 201510250245 A CN201510250245 A CN 201510250245A CN 106304257 A CN106304257 A CN 106304257A
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CN
China
Prior art keywords
relaying
long
range
relay
network
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CN201510250245.4A
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Chinese (zh)
Inventor
李栋
刘勇
邓云
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上海贝尔股份有限公司
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Priority to CN201510250245.4A priority Critical patent/CN106304257A/en
Publication of CN106304257A publication Critical patent/CN106304257A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/14Direct-mode setup
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/16Discovering, processing access restriction or access information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/20Selecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • H04W88/04Terminal devices adapted for relaying to or from another terminal or user

Abstract

The invention provides a kind of for selecting UE to the method for the relaying of network with for relaying the synchronous method of discovery.For selecting UE to be included in without performing following steps at the long-range UE of the network coverage to the method for the relaying of network: when described long-range UE wants to communicate with described network, send relay selection request message a D2D discovery cycle;After have sent described relay selection request message, it is switched to reception pattern;Receiving the relay selection response message from one or more candidate relay UE in the described D2D discovery cycle, wherein said one or more candidate relay UE are in the network coverage and have relay capabilities;And from the one or more candidate relay UE, select one first relaying UE based on described relay selection response message.

Description

Select UE to the method for the relaying of network with for relaying the synchronous method of discovery

Technical field

The present invention generally relates to wireless communication field, more specifically, relates to a kind of for selecting UE to the method for the relaying of network with for relaying the synchronous method of discovery and relevant device.

Background technology

Subscriber equipment (UE) arrives network trunk (UE-to-Network relay, below it also is indicated as UE-to-NW relaying) it is an important topic in Long Term Evolution (LTE) R13, it is for being connected the long-range UE outside network coverage with cellular network so that remotely UE can communicate with the relevant portion (such as succouring control centre) in network.This is the most meaningful for may relate to the public safety applications covered without the network coverage or subnetwork, such as under the rescue of some disasters or other dangerous situations.

Before the data of long-range UE are relayed by the relay station performing UE-to-NW relaying, first it should be observed that be positioned at the network coverage and there is the UE relaying UE as long-range UE of UE-to-NW relay capabilities, and extra, UE-to-NW relaying discovery scheme is contemplated that the mobility of relaying UE and long-range UE is to support service continuity.

On the other hand, LTE R12 discusses and directly communicates the discussion that (D2D) find about equipment room, but it only considered the situation of the network coverage, can be by discovery UE being synchronized to network timing from the downlink reference signal of base station (eNB).In this D2D finds, the UE performing D2D discovery can send SLSS (Sidelink synchronization signal, sidelinks synchronizing signal).But, in R12, finding that UE sends the purpose of SLSS is to support that the minizone UE in asynchronous network finds, UE only needs the discovery signal of the timing slip the estimating neighbor cell UE to be correctly received in neighbor cell.Therefore, in R12, if SLSS sends by finding that UE triggers, then find that UE will not send physical side link broadcast channel (Physical Sidelink Broadcast Channel, PSBCH).Additionally, given being used for sends the discovery resource pool finding signal, UE only sends SLSS in a subframe in each discovery cycle.

Summary of the invention

It can be seen that the D2D that current D2D discovery mechanism only supports the network coverage finds.

For problem above, the present invention proposes selection/reselection mechanism and the synchronization mechanism that a kind of UE-to-NW relaying finds, with the support section network coverage with without the relaying discovery under the network coverage and synchronization.

According to an aspect of the present invention, provide a kind of for selecting UE to be included in without performing following steps at the long-range UE of the network coverage to the method for the relaying of network: when described long-range UE wants to communicate with described network, send relay selection request message a D2D discovery cycle;After have sent described relay selection request message, it is switched to reception pattern;Receiving the relay selection response message from one or more candidate relay UE in the described D2D discovery cycle, wherein said one or more candidate relay UE are in the network coverage and have relay capabilities;And from the one or more candidate relay UE, select one first relaying UE based on described relay selection response message.

According to another aspect of the present invention, it is provided that a kind of synchronous method found for the relaying of UE to network, it is included in the following steps performed at the UE of the network coverage: receive the reference signal of the serving BS from described UE;Determine the Reference Signal Received Power from described serving BS according to described reference signal, and described Reference Signal Received Power is compared with predefined first threshold;When determine described Reference Signal Received Power less than described first threshold and described UE have D2D data to be sent time, in the isochronous resources being pre-configured with, SLSS/PSBCH is sent, so that the long-range UE without the network coverage can select described UE as reference synchronization in the direct communication cycle of D2D.

According to another aspect of the present invention, provide a kind of synchronous method found for the relaying of UE to network, it is included in the following steps performed at the UE of the network coverage, but wherein said UE has relay capabilities not by the long-range UE without the network coverage selected as relaying UE: receive the dedicated signaling of the serving BS from described UE, and described dedicated signaling is used for ordering described UE to send continuous print SLSS/PSBCH;Continuous print SLSS/PSBCH is sent so that described long-range UE can select described UE as reference synchronization according to described dedicated signaling.

According to another aspect of the present invention, provide a kind of synchronous method found for the relaying of UE to network, being included in the following steps performed at the UE of the network coverage, but wherein said UE has a relay capabilities the most not by the long-range UE without the network coverage selected as relaying UE: detects from the SLSS/PSBCH of described long-range UE and determines whether the timing of described long-range UE is directed at the timing of the serving BS of described UE;When described UE determines the timing misalignment of the timing of described long-range UE and the serving BS of described UE, send continuous print SLSS/PSBCH so that described long-range UE can select described UE as reference synchronization.

According to another aspect of the present invention, provide a kind of synchronous method found for the relaying of UE to network, be included in the following steps performed at the UE of the network coverage, wherein said UE by the long-range UE without the network coverage selected as the relaying UE of described long-range UE: to the serving BS of described UE report described UE by described long-range UE selected as relaying UE;The continuous print SLSS/PSBCH reference synchronization for use as described long-range UE is sent to described long-range UE.

Accompanying drawing explanation

After description by the detailed description of the invention below with reference to the present invention given by drawings below, it is better understood with the present invention, and other objects of the present invention, details, feature and advantage will become apparent from.In the accompanying drawings:

Fig. 1 shows the flow chart of the method for the relaying for selecting UE-to-NW according to one aspect of the invention;

Fig. 2 shows and finds, for what D2D found, the schematic diagram that resource pool divides;

Fig. 3 A shows the flow chart of the synchronous method found for UE-to-NW relaying according to an embodiment of the present, Fig. 3 B shows the schematic diagram of the corresponding system of the embodiment shown in Fig. 3 A, and Fig. 3 C shows the corresponding sequential chart of the embodiment shown in Fig. 3 A;

Fig. 4 A shows the flow chart of the synchronous method found for UE-to-NW relaying of the another kind of embodiment according to the present invention, Fig. 4 B shows the schematic diagram of the corresponding system of the embodiment shown in Fig. 4 A, and Fig. 4 C shows the corresponding sequential chart of the embodiment shown in Fig. 4 A;

Fig. 5 A shows the flow chart of the synchronous method found for UE-to-NW relaying of the another kind of embodiment according to the present invention, and Fig. 5 B shows the schematic diagram of the corresponding system of the embodiment shown in Fig. 5 A;

Fig. 6 A shows the flow chart of the synchronous method found for UE-to-NW relaying of the another kind of embodiment according to the present invention, and Fig. 6 B shows the schematic diagram of the corresponding system of the embodiment shown in Fig. 6 A.

Detailed description of the invention

It is more fully described the preferred embodiment of the present invention below with reference to accompanying drawings.Although accompanying drawing shows the preferred embodiment of the present invention, however, it is to be appreciated that may be realized in various forms the present invention and should not limited by embodiments set forth herein.On the contrary, it is provided that these embodiments are to make the present invention more thorough and complete, and complete for the scope of the present invention can be conveyed to those skilled in the art.

About strengthen UE-to-NW The relay selection that relaying finds / Gravity treatment mechanism:

Proposed scheme includes two major parts: find relay selection/reuse adoption process that resource pool divides and performed by long-range UE.

Fig. 1 shows the flow chart of the method 100 of the relaying for selecting UE-to-NW according to one aspect of the invention.Method 100 is performed by long-range UE.As shown in fig. 1, it is assumed that remotely UE is the UE (being i.e. in outside network or the UE of network edge) covered without the network coverage or subnetwork, and UE1-UE4 is the UE (being i.e. in the UE in network) having the network coverage.

In step 101, when the long-range UE being in outside the network coverage wants to communicate with network, it sends relay selection request message.

In one implementation, relay selection request message can comprise relevant information, one or more in type of message (that is, relaying find request), the identifier (source for indicating this relay selection to ask) of long-range UE, group identifier (identifier of the group belonging to this long-range UE) etc..

In one implementation, the discovery resource pool being used for D2D discovery being pre-configured with is divided into two parts, is called request district and response district.In this realization, described relay selection request message sends in request district.Response district is used for sending relay selection response message, as described below.

Fig. 2 shows and finds, for what D2D found, the schematic diagram that resource pool divides.As shown in Figure 2, the discovery resource pool in the D2D discovery cycle being divided in time domain request district and response district, request district finds the message of request for sending similar relaying, and response district may be used for sending similar relaying and finds the message of response.Fig. 2 show to the temporal partitioning finding that resource pool is carried out, but, the invention is not limited in this, it will be understood by those skilled in the art that to finding that resource pool carries out the division of other forms be also feasible.

Find that resource pool divides can realize simply.In one implementation, it is possible to use several bits (the most most 5 or 6 bit) indicate the quantity of the subframe being used as request district.It is, for example possible to use 0 represents do not have resource pool to divide, 1 represents that first subframe finding resource pool of configuration is used as asking district (the most remaining subframe is used as response district) etc..In another implementation, several resource pool partition mode can be pre-defined in a system specification, and make index of reference be pre-configured with used resource pool partition mode.For example, it is possible to four resource pool partition modes of definition 0,8,16,32}, the wherein number of sub frames in the request district that numeral expression starts from discovery resource pool, and can only use two bits that the request district size being pre-configured with is indexed.

After step 101 have sent relay selection request message (such as, before response district starts), long-range UE is switched to reception pattern.

In step 102, the relay selection request message of long-range UE is had some UE of relay capabilities (referred to as candidate relay UE) and is properly received (such as in network, assume that UE1, UE2 and UE3 in FIG have received this message), and these candidate relay UE to this long-range UE send relay selection response message with to the relay selection of long-range UE request message respond.

Here, from the viewpoint of candidate relay UE, once it detects that relay selection request message and condition based on self and ability determine that it can undertake relaying role, then it will send relay selection response message to long-range UE.

In one implementation, this relay selection response message include the information of the existence for indicating candidate relay UE and some information relevant to their relay function (identifier of such as candidate relay UE, the corresponding identifier of long-range UE, backhaul link quality, remaining relay capabilities, etc. in one or more).

In one implementation, candidate relay UE sends this relay selection response message in the response district finding resource pool.

By discovery resource pool is divided, in relaying finds, remotely UE can relay and select request message arrangement to be transmitted in request district, and is transformed into reception pattern before response district starts to receive and to decode by the relay selection response message of possible relaying UE transmission.In this way, it is possible to achieve following advantage:.

1) it is scheduled in the scheme found in resource pool in next one discovery cycle with discovery response message or after have sent discovery request message, discovery response message is dispatched the scheme in direct communication resource pond (although the previous scheme of the retardation ratio of latter approach is good many, because the value in configurable discovery cycle is bigger) compare, it is possible to greatly reduce finding operating lag.Generally it is desirable that operating lag can be the least, especially in the case of occurred events of public safety.

2) it can be avoided that the half-duplex of requests/response messages limits.Such as, if resource pool is not divided, then need discovery request message and find that response message is arranged in discovery resource pool (i.e., depend on specific timing, relaying UE can identical or next find the cycle discovery resource pool in send find response message), if and remotely UE does not select to relay UE, it can resend discovery request message in next discovery cycle.In this case, it may be found that conflict between the discovery response message finding request message and some relayings UE resend of long-range UE.By resource pool is divided, it is to avoid this possible collision problem.

Additionally, in one implementation, relay selection request message and relay selection response message can with the form of multicast, broadcast or clean culture use in request district or response district selected by or scheduled resource be transmitted.

It follows that in step 103, long-range UE relay selection based on candidate relay UE received response message selects a relaying UE from candidate relay UE.

In one implementation, long-range UE can select to relay UE based on the D2D link-quality between that carry in the backhaul link quality between candidate relay UE carried in relay selection response message and its serving BS and/or relay selection response message or that remotely UE calculates candidate relay UE and long-range UE.

More specifically, remotely the backhaul link quality between D2D link-quality and/or candidate relay UE and the base station between candidate relay UE and long-range UE can be compared by UE with predefined respective threshold, list all candidate relay UE of satisfied selection standard to create the list of candidate relay UE, and select optimal candidate relay UE to relay UE as it.In fig. 1, it is assumed that UE1 by long-range UE selected as relaying UE.

On the other hand, if in step 103, long-range UE does not choose satisfied relaying UE, then remotely at next, UE will find that the request district in cycle continues to send relay selection request message (i.e. returning step 101).

It follows that in step 104, long-range UE and selected relaying UE (i.e. UE1) creates D2D and is connected.

The establishment that D2D connects includes: first carry out cross-certification between long-range UE and relaying UE and D2D link safety is arranged, it is then based on the information (such as remotely unique interim UE mark (GUTI) in the whole world of UE) specific to long-range UE, shared data net (Public Data Network between amendment relaying UE and core net, PDN) connect and/or the grouping system (Evolved Packet System, EPS) of evolution carries.Thereafter, relaying UE confirms relay selection to long-range UE, then can start the data service between long-range UE and network via the relaying of relaying UE.

Here, the D2D connection establishment process between long-range UE with relaying UE is similar with of the prior art, therefore repeats no more.

So far, complete the D2D connection establishment between the long-range UE being in outside the network coverage and the relaying UE being in the network coverage, thus remotely UE can communicate with base station and core net via relaying UE.

Further, method 100 can also include step 105, establishes (such as during relaying UE provides the process of service for long-range UE) after D2D is connected between long-range UE with relaying UE, and relaying UE can periodically send relaying monitoring message.

Here, during the transmission of relaying monitoring message can be arranged on the request district or the response district that find resource pool.It is to say, the resource of the transmission for relaying monitoring message can select in whole discovery resource pool, and do not consider that resource pool divides.In this way, the severe jamming in some specific resources districts can be avoided.

It follows that in step 106, long-range UE can determine the backhaul link quality between the D2D link-quality between relaying UE and long-range UE and/or relaying UE and base station based on relaying monitoring message.

In one implementation, the backhaul link quality between relaying UE and base station can be obtained by relaying UE measurement and carry in relaying monitoring message.

In one implementation, the D2D link-quality between relaying UE and long-range UE such as can be obtained by the reference signal in measurement relaying monitoring message by long-range UE.

Additionally, for the impact removing the little scope decline in measurement result, physical layer measurement result can also be used high level filtering in step 106.

It follows that in step 107, long-range UE determines that whether the D2D link-quality determined in step 106 and/or backhaul link quality are less than predefined respective threshold.

Such as, due to long-range UE and/or the movement of relaying UE, remotely the backhaul link quality between D2D link-quality or relaying UE and the base station between UE and relaying UE is deteriorated and less than predefined respective threshold (step 107 is judged as YES), then remotely UE determines that the relaying UE (i.e. UE1) selected before is not suitable anymore for as the relaying UE of long-range UE.In this case, long-range UE will trigger following relaying reuse adoption process.

But, the invention is not limited in this.Even if it will be understood by those skilled in the art that D2D link-quality and backhaul link quality the most do not decline, long-range UE still can start following relaying reuse adoption process with the relaying UE reselected preferably or be more suitable for.

Relaying relay selection process described in reuse adoption process step 101-104 above in conjunction is similar to, difference essentially consists in the identifier that relaying reselection request message also should comprise the relaying UE selected before, and relaying gravity treatment response message can comprise the D2D link-quality between relaying UE and new candidate relay UE selected before, for possible data service transfer, thus support service continuity, as detailed below.

On the other hand, if D2D link-quality and backhaul link quality the most do not decline (step 107 is judged as NO), then remotely UE can continue the relaying monitoring message of periodic receipt relaying UE.

In step 108, when long-range UE determines when the D2D link-quality that step 106 determines and/or backhaul link quality are less than predefined respective threshold (step 107 is judged as YES), send relaying reselection request message and reselect relaying UE with request.

Similar with relay selection request message, relaying reselection request message can comprise relevant information, one or more in type of message (that is, relaying find request), the identifier (source for indicating this relay selection to ask) of long-range UE, group identifier (identifier of the group belonging to this long-range UE) etc..

Relaying reselection request message may indicate that the degrading quality of D2D link and/or back haul link, it is therefore desirable to gravity treatment another relaying UE.

In addition, in one implementation, relaying reselection request message can also comprise the identifier of the relaying UE (i.e. UE1) selected before enable to underway continue gravity treatment time consider before D2D link-quality between the relaying UE that selects and possible new relaying UE, for possible, data are passed to new relaying UE from relaying UE before, thus support service continuity.

Similar with relay selection request message, relaying reselection request message arrangement can be transmitted in the request district finding resource pool.

Being similar to, long-range UE is after have sent relaying reselection request message, more typically for property, before response district starts, is switched to reception pattern.

Next, in step 109, remotely the relaying reselection request message of UE is properly received (such as by candidate relay UE in network, assume that UE1, UE2 and UE3 in FIG have received this message), and these candidate relay UE to this long-range UE send relaying gravity treatment response message respond with the relaying reselection request message to long-range UE.

Here, relaying gravity treatment response message is similar with relay selection response message, difference is to relay gravity treatment response message can comprise the D2D link-quality between other candidate relay UE (i.e. except when other candidate relay UE outside front relaying UE, such as UE2 and UE3 in Fig. 1) and current relaying UE (such as UE1).Comprising this information is for the possible data service transfer between new relaying UE and old relaying UE, to support service continuity.

Similar with relay selection response message, relaying gravity treatment response message can be arranged in the response district finding resource pool and be transmitted.

It follows that in step 110, long-range UE relaying based on candidate relay UE received gravity treatment response message reselects a new relaying UE from candidate relay UE.

In one implementation, long-range UE can carry out relaying gravity treatment based on the D2D link-quality between long-range UE and new relaying UE, the backhaul link quality between new relaying UE and its serving BS and the D2D link-quality between relaying UE before and new relaying UE.Remotely UE will update the list of candidate relay UE according to detected relaying gravity treatment response message and relevant measured value, and selects optimal candidate relay UE as the relaying UE of gravity treatment.In fig. 1, it is assumed that UE3 by long-range UE gravity treatment as relaying UE.

On the other hand, if in step 110, long-range UE does not has gravity treatment to arrive satisfied relaying UE, then remotely the request district relaying supervention finding the cycle at next is sent relaying reselection request message (that is, returning to step 108) by UE.

It follows that in step 111, long-range UE creates D2D with the relaying UE (i.e. UE3) of gravity treatment and is connected, similar with step 104.

About UE-to-NW The synchronization mechanism that relaying finds:

As described in the background section, in existing D2D finds, only considered the situation of the network coverage, discovery UE is synchronized to network by the downlink reference signal always by base station, and in this D2D finds, find that UE only sends SLSS in a subframe in each discovery cycle and do not sends PSBCH.

But, for UE-to-NW relays, it is desirable to find UE SLSS/PSBCH continuously transmit the fewest, so that for the interference of cellular network and minimum energy consumption.But, the UE that once can relay starts to relay for one or more long-range UE, and it continuously transmits SLSS/PSBCH according to the system configuration for synchronizing, to provide permanent and reliable reference synchronization to long-range UE.

From the above considerations, the synchronization mechanism that the present invention finds about UE-to-NW relaying devises following scheme.

Fig. 3 A shows the flow chart of the synchronous method 300 found for UE-to-NW relaying according to an embodiment of the present.Fig. 3 B shows the schematic diagram of the corresponding system of the embodiment shown in Fig. 3 A.Fig. 3 C shows the corresponding sequential chart of the embodiment shown in Fig. 3 A.Wherein, Fig. 3 C use the square of 1,2,3 labellings indicate respectively physical side link control channel (physical sidelink control channel, PSCCH) resource pool, physical side link shared channels (physical sidelink shared channel, PSSCH) resource pool and physical side link discovery channel (physical sidelink discovery channel, PSDCH) resource pool.

As shown in Figure 3 B, for synchronous method 300, it is assumed that UE1 and UE2 is in the network coverage, long-range UE outside the network coverage, and UE1 only relate to D2D find and UE2 relates to D2D and directly communicates.

Method 300 includes step 310, and wherein UE2 receives the reference signal (RS) from its serving BS.

It follows that in step 320, according to this reference signal, UE2 determines that the RS from its serving BS receives power (RSRP), and it is compared with predefined threshold value.

In step 330, when determine RSRP be less than this threshold value and UE2 have D2D data to be sent time, the direct communication cycle of D2D sends in the isochronous resources configured SLSS/PSBCH.

Here, if UE2 does not has data to send in the direct communication cycle of some D2D, then UE2 can not send SLSS/PSBCH in this direct communication cycle.

Next, in step 340, remotely UE determines the sidelinks Reference Signal Received Power (S-RSRP) from UE2 according to the PSBCH of the UE2 received, and when determined by S-RSRP exceed predefined threshold value time, UE2 is as reference synchronization (SyncRef) in selection.

In method 300, find owing to UE1 only relates to D2D, and only sending SLSS (as shown in FIG. 3 C) in the discovery resource pool configured, therefore remotely UE can not measure the S-RSRP of UE1, thus UE1 can not be by long-range UE selected as synchronisation source.

Fig. 4 A shows the flow chart of the synchronous method 400 found for UE-to-NW relaying of the another kind of embodiment according to the present invention.Fig. 4 B shows the schematic diagram of the corresponding system of the embodiment shown in Fig. 4 A.Fig. 4 C shows the corresponding sequential chart of the embodiment shown in Fig. 4 A.Wherein, Fig. 4 C use the square of 1,2,3 labellings indicate respectively physical side link control channel (physical sidelink control channel, PSCCH) resource pool, physical side link shared channels (physical sidelink shared channel, PSSCH) resource pool and physical side link discovery channel (physical sidelink discovery channel, PSDCH) resource pool.

As shown in Figure 4 B, for synchronous method 400, similar with method 300, it is assumed that UE1 and UE2 is in the network coverage, long-range UE outside the network coverage, and UE1 only relate to D2D find and UE2 relates to D2D and directly communicates.

Method 400 includes step 410, and wherein UE1 sends SLSS in the discovery resource pool configured.Here, but UE1 has UE-to-NW relay capabilities not by long-range UE selected as actual relaying UE.In this case, the D2D during UE1 will comply with LTE R12 finds synchronization mechanism, i.e. only send a SLSS in each discovery cycle.

In one implementation, according to the reference signal (RS) from its Serving cell, UE1 determines that the RS from its serving BS receives power (RSRP), and it compared with predefined threshold value.When measured RSRP less than this threshold value time, configured find resource pool first subframe in (if this first subframe belongs to isochronous resources) send a SLSS.Otherwise, at last synchronization subframe transmission SLSS found before resource pool configured.

It follows that in step 420, UE1 receives the dedicated signaling from its serving BS, this dedicated signaling is used for ordering UE1 to send continuous print SLSS/PSBCH.

Such as, when the serving BS of UE1 knows that its adjacent base station collapses, it can explicitly send this dedicated signaling to UE1.Such as, base station knows that UE1 has relay capabilities and is positioned at network coverage edge, reliable reference synchronization can be provided without other transmission in base station are produced severe jammings by the UE to subnetwork covering with without the network coverage hence in so that UE1 sends SLSS/PSBCH.

It follows that in step 430, UE1 sends continuous print SLSS/PSBCH according to the dedicated signaling received.

In step 440, long-range UE selection UE1 is as reference synchronization (SyncRef), similar with step 340.

Note, owing to UE1 with UE2 uses identical synchronization configuration, so the SLSS/PSBCH of they transmissions is identical and NATIVE FUSION (for UE2 has data to the direct communication cycle sent) on eating dishes without rice or wine.

Fig. 5 A shows the flow chart of the synchronous method 500 found for UE-to-NW relaying of the another kind of embodiment according to the present invention.Fig. 5 B shows the schematic diagram of the corresponding system of the embodiment shown in Fig. 5 A.

As shown in Figure 5 B, for synchronous method 500, it is assumed that UE1 is in the network coverage, long-range UE is outside the network coverage, and UE1 only relates to D2D and finds.

Method 500 includes step 510, and wherein UE1 sends SLSS in the discovery resource pool configured.Here, but UE1 has UE-to-NW relay capabilities not by long-range UE selected as actual relaying UE.In this case, the D2D during UE1 will comply with LTE R12 finds synchronization mechanism, i.e. only send a SLSS in each discovery cycle.

In one implementation, according to the reference signal (RS) from its Serving cell, UE1 determines that the RS from its serving BS receives power (RSRP), and it compared with predefined threshold value.When measured RSRP less than this threshold value time, configured find resource pool first subframe in (if this first subframe belongs to isochronous resources) send a SLSS.Otherwise, at last synchronization subframe transmission SLSS found before resource pool configured.

It follows that in step 520, UE1 detects the SLSS/PSBCH from long-range UE, and determines whether the timing of this long-range UE is directed at the timing of the serving BS of UE1.

Here, it is assumed for example that long-range UE has some data to send (such as it wants to find that request message finds UE-to-NW relaying UE by transmission relaying), then, before the transmission of its data, first long-range UE searches for existing reference synchronization.If it find that some SyncRefUE, then remotely UE adjusts its timing to be synchronized to this reference synchronization.Otherwise, it takes the role in independent synchronization source (SS) to send SLSS/PSBCH and data service.

It follows that in step 530, when UE1 determines the timing misalignment of the timing of this long-range UE and the serving BS of UE1, send continuous print SLSS/PSBCH to this long-range UE.

It is to say, in this case, long-range UE have employed and is different from the reference synchronization of the network belonging to UE1 or as independent synchronization source.

UE1 detects that the SLSS/PSBCH of the UE without the network coverage represents that the UE sending SLSS/PSBCH is positioned at outer and not yet discovery cellular network coverage the reference synchronization UE of network coverage or not yet finds to be positioned at outside network coverage the reference synchronization UE (being i.e. in the reference synchronization UE that subnetwork covers) of the SLSS sequence still with network.

In step 540, long-range UE selects UE1 as reference synchronization (SyncRef).

The most after step 520, before step 530, method 500 can also include: UE1 sends SLSS/PSBCH transmission request to its serving BS, and receive and accept response message from its serving BS, and this accepts response message for allowing UE1 to send continuous print SLSS/PSBCH.

Fig. 6 A shows the flow chart of the synchronous method 600 found for UE-to-NW relaying of the another kind of embodiment according to the present invention.Fig. 6 B shows the schematic diagram of the corresponding system of the embodiment shown in Fig. 6 A.

As depicted in figure 6b, for synchronous method 600, it is assumed that UE1 is in the network coverage, long-range UE is outside the network coverage, and UE1 has UE-to-NW relay capabilities.

Method 600 includes step 610, wherein UE1 by long-range UE selected as the relaying UE of long-range UE.

It follows that in step 620, UE1 to its serving BS report its by long-range UE selected as relaying UE.In this way so that base station is able to know that the periodic SLSS/PSBCH transmission of relaying UE (UE1), thus avoids this relaying UE scheduling in the resource shared by SLSS/PSBCH transmission.

It follows that in step 630, UE1 sends the continuous print SLSS/PSBCH reference synchronization for use as long-range UE to long-range UE.

In this embodiment, as depicted in figure 6b, it is assumed that initially remotely UE is using UE2 as its reference synchronization, and sends relaying and finds request message.After relay selection process, long-range UE selects UE1 as relaying UE.In this case, relaying UE can implicitly continuously transmit or send SLSS/PSBCH after the implicit commands signaling of eNB.In this case, although it is that remotely UE has reference synchronization (such as that relaying UE continuously transmits the reason of SLSS/PSBCH, relate to the UE2 of direct data communication), but the transmission of the SLSS/PSBCH of reference synchronization be not continuous print (i.e., it does not sends SLSS/PSBCH in not having the direct communication cycle having data to send), therefore can provide permanent and reliable reference synchronization to long-range UE by utilizing the relaying UE (i.e. UE1) of long-range UE to continuously transmit SLSS/PSBCH.

The UE-to-NW that invention proposes a kind of enhancing relays discovery scheme, mainly includes findings that resource pool division and the relay selection strengthened and reuse adoption process.Utilize find resource pool divide, relaying find request and response message half-duplex limit it can be avoided that, and it was found that operating lag can be reduced significantly.Utilize the relay selection/reuse adoption process strengthened, relaying gravity treatment is triggered by long-range UE event, and avoid the periodicity signalling (discovery notice message) from all candidate relay UE, and that periodicity signalling will bring energy dissipation and the possible interference transmitting other.

The present invention also proposes a kind of effective synchronization control mechanism, the public safety in LTE R13, relays UE in particular for UE-to-NW.Scheme proposed by utilization, on the one hand enable to SLSS/PSBCH to continuously transmit the impact on cellular network the least, on the other hand, (relaying) UE continuously transmit can to long-range UE offer permanent and reliable reference synchronization.

In one or more exemplary design, function described herein can be realized by hardware, software, firmware or their combination in any.If realized with software, then described function can be stored on a computer-readable medium as one or more instructions or code, or transmit as the one or more instructions on computer-readable medium or code.Computer-readable medium includes computer-readable storage medium and communication media, and wherein communication media includes that contribute to computer program is delivered to the arbitrary medium of another place from a place.Storage medium can be the addressable any usable medium of universal or special computer.This computer-readable medium can include, such as but not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disc memory apparatus, disk storage equipment or other magnetic storage apparatus, or can be used for carrying with the form of universal or special computer or the addressable instruction of universal or special processor or data structure or storing other medium any of desired code modules.Further, computer-readable medium of can also being known as arbitrarily is connected.Such as, if software be use coaxial cable, optical fiber cable, twisted-pair feeder, the wireless technology of Digital Subscriber Line (DSL) or such as infrared ray, radio and microwave etc to come from website, server or other remote source, then the wireless technology of coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, radio and microwave etc is also included within the definition of medium.

Can be by general processor, digital signal processor (DSP), special IC (ASIC), field programmable gate array (FPGA) or other PLD, discrete gate or transistor logic, discrete hardware components or for performing various exemplary logical block, module and the circuit that the combination in any of function as herein described realizes or perform combining described by the disclosure.General processor can be microprocessor, or, processor can also be any common processor, controller, microcontroller or state machine.Processor can also be embodied as the combination of calculating equipment, such as, DSP and the combination of the combination of microprocessor, multi-microprocessor, one or more microprocessor and DSP core, or other this kind of structure any.

Those of ordinary skill in the art it is also understood that the various exemplary logical block, module, circuit and the algorithm steps that combine embodiments herein description can be implemented as electronic hardware, computer software or combination.In order to clearly show that this interchangeability between hardware and software, above various exemplary parts, block, module, circuit and step are all carried out general description around its function.It is implemented as hardware as this function and is also implemented as software, depend on specifically applying and apply design constraint over the whole system.Those skilled in the art can realize described function for every kind of application-specific in the way of flexible, but, this realize decision-making and should not be interpreted as causing a departure from the scope of this disclosure.

The above description of the disclosure is for making any those of ordinary skill of this area be capable of or use the present invention.To those skilled in the art, the various amendments of the disclosure will be apparent from, and general principle defined herein can also be applied to other deformation in the case of without deviating from the spirit and scope of the disclosed invention.Therefore, the present invention is not limited to example as herein described and design, but consistent with the widest scope of principle disclosed herein and novel features.

Claims (15)

1., for selecting UE to a method for the relaying of network, it is included in without the network coverage Long-range UE at perform following steps:
When described long-range UE wants to communicate with described network, find at a D2D Cycle sends relay selection request message;
After have sent described relay selection request message, it is switched to reception pattern;
The described D2D discovery cycle receives in one or more candidate relay UE Continue Response to selection message, and wherein said one or more candidate relay UE are in the network coverage And there is relay capabilities;And
Select from the one or more candidate relay UE based on described relay selection response message Select one first relaying UE.
Use in the most described D2D discovery cycle The discovery resource pool found in D2D is divided into request district and response district, and wherein said Relay selection request message sends in described request district, and described relay selection response message exists Described response district receives.
3. the method for claim 1, wherein said relay selection request message includes The group mark of the group belonging to type of message, the identifier of described long-range UE, described long-range UE One or more in symbol;And
Wherein said relay selection response message includes for indicating depositing of described candidate relay UE Information, and the identifier of each candidate relay UE, the identifier of described long-range UE, The backhaul link quality of each candidate relay UE, each candidate relay UE remaining relaying energy One or more in power.
4. the method for claim 1, wherein said long-range UE is based on each relaying Returning between corresponding candidate relay UE and its serving BS that carry in Response to selection message That carry in journey link-quality and/or described relay selection response message or described long-range UE D2D link-quality between described candidate relay UE and the described long-range UE that calculate selects Select described first relaying UE.
5. the method for claim 1, also includes: periodically receive from described The relaying monitoring message of the first relaying UE.
6. method as claimed in claim 5, also includes:
Based on described relaying monitoring message determine described first relaying UE and described long-range UE it Between D2D link-quality and/or described first relaying UE and serving BS between backhaul chain Road quality.
7. method as claimed in claim 6, also includes:
D2D link-quality determined by determining and/or determined by backhaul link quality the lowest In predefined threshold value.
8. method as claimed in claim 7, also includes:
D2D link-quality determined by when and/or determined by backhaul link quality less than described During predefined threshold value, send relaying reselection request message and reselect relaying with request UE;
Receive the relaying gravity treatment response message from the one or more candidate relay UE;With And
Based on described relaying gravity treatment response message weight from the one or more candidate relay UE The newly selected one second relaying UE.
9. method as claimed in claim 8, wherein, described relaying reselection request message exists Finding to send in the request district of resource pool, described relaying gravity treatment response message is finding resource pool Response district in receive.
10. method as claimed in claim 8, wherein said relaying reselection request message includes The group mark of the group belonging to type of message, the identifier of described long-range UE, described long-range UE In symbol one or more and described first relaying UE identifier;And
Wherein said relaying gravity treatment response message includes for indicating depositing of described candidate relay UE Information, with the identifier of each candidate relay UE, the identifier of described long-range UE, The backhaul link quality of each candidate relay UE, each candidate relay UE remaining relaying energy Between one or more in power, and described first relaying UE and each candidate relay UE The information of D2D link-quality.
11. 1 kinds are used for selecting UE to the device of the relaying of network, and described device is without network In the long-range UE covered, described device includes:
For when described long-range UE wants to communicate with described network, at a D2D The discovery cycle sends the unit of relay selection request message;
For, after have sent described relay selection request message, being switched to the list of reception pattern Unit;
For receiving from one or more candidate relay UE in the described D2D discovery cycle The unit of relay selection response message, wherein said one or more candidate relay UE are in The network coverage is interior and has relay capabilities;And
For based on described relay selection response message from the one or more candidate relay UE The unit of middle selection one first relaying UE.
12. 1 kinds of synchronous method found for the relaying of UE to network, have been included in network The following steps performed at the UE covered:
Receive the reference signal of the serving BS from described UE;
The Reference Signal Received Power from described serving BS is determined according to described reference signal, And described Reference Signal Received Power is compared with predefined first threshold;
When determining that described Reference Signal Received Power is less than described first threshold and described UE tool When having D2D data to be sent, in the synchronization money being pre-configured with in the direct communication cycle of D2D Source sends SLSS/PSBCH, so that the long-range UE without the network coverage can select described UE is as reference synchronization.
13. 1 kinds of synchronous method found for the relaying of UE to network, have been included in network The following steps that the UE place covered performs, wherein said UE have relay capabilities still the most not by Without the network coverage long-range UE selected as relaying UE:
Receiving the dedicated signaling of the serving BS from described UE, described dedicated signaling is used for ordering Described UE is made to send continuous print SLSS/PSBCH;
Continuous print SLSS/PSBCH is sent so that described long-range UE according to described dedicated signaling Described UE can be selected as reference synchronization.
14. 1 kinds of synchronous method found for the relaying of UE to network, have been included in network The following steps that the UE place covered performs, wherein said UE have relay capabilities still the most not by Without the network coverage long-range UE selected as relaying UE:
Detect from the SLSS/PSBCH of described long-range UE and determine described long-range UE Timing whether be directed at the timing of the serving BS of described UE;
When described UE determines determining of the timing of described long-range UE and the serving BS of described UE Time misalignment time, send continuous print SLSS/PSBCH so that described long-range UE can select Select described UE as reference synchronization.
15. 1 kinds of synchronous method found for the relaying of UE to network, have been included in network The following steps that the UE place covered performs, wherein said UE long-range without the network coverage of quilt UE is selected as the relaying UE of described long-range UE:
To described UE serving BS report described UE by described long-range UE selected as in Continue UE;
Continuous print SLSS/PSBCH is sent for use as described long-range UE's to described long-range UE Reference synchronization.
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