CN105634697A - Method and apparatus for configuring signal parameters in radio-interface based synchronization mechanism (RIBS) - Google Patents

Abstract

The invention provides a method and apparatus for configuring signal parameters in a radio-interface based synchronization mechanism (RIBS). The method for configuring the signal parameters in the RIBS comprises the steps of configuring source cells of the same layer with reference signals as LRSs, wherein the LRSs of the source cells of the same layer are the same, configuring the LRSs transmitted by the source cells of the same layer with the same sub frame offset, and configuring the LRSs transmitted by source cells of different layers with different sub frame offsets; and controlling the source cells, based on the sub frame offsets of the configured LRSs, to transmit the LRSs to corresponding sub frame positions. By configuring the source cells of the same layer with the same LRSs as the reference signals, the scheme enables the LRSs transmitted by the source cells of the same layer to be enhanced in terms of mutual additivity so as to obtain signal diversity gains, in this way, the problems of interference, due to the RE resource conflict, among LRSs (LRS, listening RS) transmitted by the plurality of source cells of different layers in ultra-dense small cell deployment scenarios in the prior art are solved, and the network RIBS performance is improved.

Description

The collocation method of signal parameter and device in a kind of air interface synchronization

Technical field

The present invention relates to wireless technical field, particularly relate to collocation method and the device of signal parameter in a kind of air interface synchronization.

Background technology

In order to disturb between suppression station, Time and Frequency Synchronization between standing with the TDD base station needs of frequency deployment. 3GPP preferentially support 3 kinds station between Time and Frequency Synchronization scheme: (1) based on GNSS (GlobalNavigationSatelliteSystem, global navigation satellite system) satellite synchronization, as GPS synchronize; (2) based on desirable backhaul Network Synchronization, as IEEE1588v2 synchronizes; (3) air interface synchronization (radio-interfacebasedsynchronizationmechanism is called for short RIBS). In LTE typical case's application scenarios (such as HomeeNodeB, NanoCell, SmallCell) such as indoor, high building focus covering, gps signal not easily obtains, and desirable backhaul is difficult to ensure that simultaneously, it is therefore desirable to research air interface synchronization technology.

At present, 3GPP pays close attention to the air interface synchronization technology of a kind of network intercepting (NW:networklistening) by name, its ultimate principle is: base station to be synchronized (is called target BS, or targetcell) intercept and synchronize base station and (be called source base station, or sourcecell) synchronous reference signal (LRS:listeningreferencesignal), adjust local clock accordingly, to maintain Time and Frequency Synchronization between station.

RIBS technology (based on the simultaneous techniques eated dishes without rice or wine, Radiointerfacebasedsynchronization) has been studied by 3GPP early stage for Home eNodeB (HomeeNB) scene, and basic concept is as follows:

(1) new listeningRS is not defined, utilize existing reference signal (such as cell common reference signal CRS) as listeningRS, the listeningRS sequence different (by cellID scrambling) that therefore different sourcecell send;

The eNB (being called targetcell) of (2) new access synchronizing networks selects certain base station (being called sourcecell) as the synchronisation source of oneself, and namely targetcell only intercepts the listeningRS of a sourcecell;

(3) consider multi-hop synchronization scenarios, targetcellT1 (synchronization levels as n) might as well be set and intercept the CRS of sourcecellS1 (synchronization levels is n-1) at subframe M place and carry out synchronized tracking. T1 is likely to other signals (including LRS or business datum that other base stations send) listened to except the S1 LRS sent in M subframe, thus network intercepting performance is affected, has 2 kinds of dominant disturbance types:

A) n-th layer is intercepted the interference of subframe by the downstream signal of (n+1)th layer of base station;

B) downstream signal (being likely to also be LRS) of (n-1)th layer of other base stations transmission except the S1 interference to the LRS of S1;

(4) disturbing for the first kind, 3GPP proposes to solve across subframe muting (mourning in silence) mechanism;

(5) disturbing for Equations of The Second Kind, 3GPP does not discuss. The 3GPP manuscript of other companies of review, a kind of potential tendentiousness viewpoint is: send respective LRS with the multiple sourcecell of layer at same descending sub frame, these LRS are legacyRS (such as CRS, location reference signals PRS), and therefore the sequence of these LRS is different. Obviously, when the interstitial content of same layer sourcecell is less, it is possible to these LRS are staggered on frequency domain (as by frequencyshift technology), to avoid interfering of same layer LRS signal.

Especially, in HomeeNB and current smallcell deployment scenario, eNB interstitial content total in a cluster is limited, and representative value is 8. If supporting 3 jumpings altogether, then often jump in (layer) and on average have 2��3 base stations. These send the LRS signal of respective cellID scrambling (such as CRS or PRS sequence) respectively with layer base station in same subframe, it is possible to staggered in RE resource by these LRS signals by plot planning.

But the smallcell that faces the future (micro-station) more dense deployment scenario (such as 5GUDN:ultradensenetwork super-intensive network), it is likely to have more than 60 smallcell in one cluster (bunch), often jumps the smallcell that (layer) is likely to have more than 7. If according to existing RIBS technology, namely in same subframe, the LRS signal of respective cellID scrambling is sent respectively with layer base station, then owing to same layer sourcecell number has exceeded the reusing degree of LRS signal, (reusing degree such as the CRS signal of 2 ports is 3, the reusing degree of PRS signal is 6), even if these LRS signals also are difficult to stagger completely in RE resource by plot planning, therefore can interfere and reduce network air interface synchronization performance.

Summary of the invention

The technical problem to be solved in the present invention is to provide collocation method and the device of signal parameter in a kind of air interface synchronization, solve the problem interfered caused because of RE resource contention under smallcell super-intensive deployment scenario in prior art with the multiple sourcecell of the layer synchronous reference signal (LRS, listeningRS) sent.

In order to solve above-mentioned technical problem, the embodiment of the present invention provides the collocation method of signal parameter in a kind of air interface synchronization, including:

Configuring the reference signal as LRS for same layer source base station, wherein, the LRS with layer source base station is identical;

For the LRS identical sub-frame offset of configuration that same layer source base station sends, for the sub-frame offset differently configured for LRS that the source base station of different layers sends;

Control the sub-frame offset of the LRS that each source base station configures based on self, send LRS at corresponding subframe position place.

Above-mentioned collocation method, wherein, described for including as the reference signal of LRS with the configuration of layer source base station:

By any one reference signal in CRS, PRS and CSI-RS, configure the reference signal of the LRS as same layer source base station, and be the initial phase that this any one reference signal configuration is identical.

Above-mentioned collocation method, wherein, the described initial phase identical for this any one reference signal configuration includes:

Radio frame number is used to replace the base station relevant parameter in initial phase computing formula, to generate identical initial phase.

Present invention also offers the collocation method of signal parameter in a kind of air interface synchronization, including:

Receive the identical LRS from the multiple source base station of same layer;

Obtaining each self-corresponding source base station from multiple described LRS and send the time, described source base station sends the time with source base station clock for benchmark;

Obtaining when multiple described LRS arrives each self-corresponding local reception time, the described local reception time is with local clock for benchmark;

Utilize each self-corresponding described source base station of multiple described LRS to send the time and the local reception time carries out computing and obtains average timing offset estimated value.

Above-mentioned collocation method, wherein, carries out also including before computing obtains average timing offset estimated value utilizing multiple described LRS each self-corresponding described source base station transmission time and local reception time:

Obtain each self-corresponding propagated delay time of multiple described LRS;

Described utilize each self-corresponding described source base station of multiple described LRS to send time and local reception time, computing obtain average timing offset value particularly as follows:

Utilize each self-corresponding described source base station of multiple described LRS to send time, local reception time and propagated delay time to carry out computing and obtain average timing offset value.

Present invention also offers the collocation method of signal parameter in a kind of air interface synchronization, including:

Configure a LRS pattern for base station, make the LRS that this base station sends orthogonal with the LRS that other base stations of same layer send;

The LRS through community scrambling is sent according to described LRS pattern.

Above-mentioned collocation method, wherein, LRS and the LRS that other base stations of same layer send that this base station sends lays respectively in the GP of the different special subframe in TDD system.

Above-mentioned collocation method, wherein, described configure a LRS pattern for base station and includes:

The signaling of the LRS pattern that request feedback uses is sent to the adjacent base station of same layer;

Receive the described adjacent base station response message according to described signaling feedback;

In local LRS pattern database, a LRS pattern all differed with the LRS pattern of all adjacent base stations is obtained according to described response message.

Above-mentioned collocation method, wherein, described configure a LRS pattern for base station and includes:

Determine candidate's subframe of a LRS to be sent;

Described candidate's subframe is intercepted the LRS that other neighbor cells send;

If intercepted result is there is the LRS not taken by the LRS of other neighbor cells described in described candidate's subframe to configure resource, it is determined that a unappropriated LRS configures resource;

Configure resource according to the described LRS after determining and determine a kind of LRS pattern.

Above-mentioned collocation method, wherein, also includes:

If all available LRS that intercepted result is described candidate's subframe configures resource shared by the LRS of other neighbor cells described, then continue executing with the described candidate's subframe determining a LRS to be sent.

Above-mentioned collocation method, wherein, in same bunch, the transmission cycle of all LRS is all identical; If micro-station has switch translation function, then send LRS too even at resting state; LRS has the characteristic point different from other signals, and can by other cell identification adjacent out.

Present invention also offers the configuration device of signal parameter in a kind of air interface synchronization, including:

First configuration module, for for configuring the reference signal as LRS with layer source base station, wherein, the LRS with layer source base station is identical;

Second configuration module, for the LRS identical sub-frame offset of configuration for sending with layer source base station, for the sub-frame offset differently configured for LRS that the source base station of different layers sends;

Control module, for controlling the sub-frame offset of the LRS that each source base station configures based on self, send LRS at corresponding subframe position place.

Above-mentioned configuration device, wherein, described first configuration module includes:

First dispensing unit, for by any one reference signal in CRS, PRS and CSI-RS, configuring the reference signal of the LRS as same layer source base station;

Second dispensing unit, for the initial phase identical for this any one reference signal configuration.

Above-mentioned configuration device, wherein, described second dispensing unit includes:

Replace assembly, for using radio frame number to replace the base station relevant parameter in initial phase computing formula, to generate identical initial phase.

Present invention also offers the configuration device of signal parameter in a kind of air interface synchronization, including:

Receiver module, for receiving the identical LRS from the multiple source base station of same layer;

First acquisition module, sends the time for obtaining each self-corresponding source base station from multiple described LRS, and described source base station sends the time with source base station clock for benchmark;

Second acquisition module, is used for obtaining when multiple described LRS arrives each self-corresponding local reception time, and the described local reception time is with local clock for benchmark;

Computing module, is used for utilizing multiple described LRS each self-corresponding described source base station transmission time and local reception time to carry out computing and obtain average timing offset estimated value.

Above-mentioned configuration device, wherein, also includes:

3rd acquisition module, obtains each self-corresponding propagated delay time of multiple described LRS before performing operation for described computing module module;

Described computing module specifically for:

Utilize each self-corresponding described source base station of multiple described LRS to send time, local reception time and propagated delay time to carry out computing and obtain average timing offset value.

Present invention also offers the configuration device of signal parameter in a kind of air interface synchronization, including:

3rd configuration module, for configuring a LRS pattern for base station, makes the LRS that this base station sends orthogonal with the LRS that other base stations of same layer send;

Sending module, for sending the LRS through community scrambling according to described LRS pattern.

Above-mentioned configuration device, wherein, LRS and the LRS that other base stations of same layer send that this base station sends lays respectively in the GP of the different special subframe in TDD system.

Above-mentioned configuration device, wherein, described 3rd configuration module includes:

First transmitting element, for sending the signaling of the LRS pattern that request feedback uses to the adjacent base station of same layer;

Receive unit, for receiving the described adjacent base station response message according to described signaling feedback;

Acquiring unit, for obtaining a LRS pattern all differed with the LRS pattern of all adjacent base stations according to described response message in local LRS pattern database.

Above-mentioned configuration device, wherein, described 3rd configuration module includes:

First determines unit, for determining candidate's subframe of a LRS to be sent;

Second transmitting element, for intercepting the LRS that other neighbor cells send in described candidate's subframe;

Second determines unit, if being there is the LRS not taken by the LRS of other neighbor cells described in described candidate's subframe to configure resource for intercepted result, it is determined that a unappropriated LRS configures resource;

3rd determines unit, determines a kind of LRS pattern for configuring resource according to the described LRS after determining.

Above-mentioned configuration device, wherein, also includes:

Loop module, if configuring resource all shared by the LRS of other neighbor cells described for all available LRS that intercepted result is described candidate's subframe, then continues executing with the described candidate's subframe determining a LRS to be sent.

Above-mentioned configuration device, wherein, in same bunch, the transmission cycle of all LRS is all identical; If micro-station has switch translation function, then send LRS too even at resting state; LRS has the characteristic point different from other signals, and can by other cell identification adjacent out.

Having the beneficial effect that of the technique scheme of the present invention:

In such scheme, in described air interface synchronization, the collocation method of signal parameter strengthens thus obtaining signal diversifying gain by configuring the identical LRS LRS signal additivity each other making same layer source base station send as reference signal for same layer source base station, or it is the differently configured LRS pattern of same layer source base station, make the LRS sent each other orthogonal, thus solving in prior art under smallcell super-intensive deployment scenario with the multiple sourcecell of the layer synchronous reference signal (LRS sent, listeningRS) problem interfered caused because of RE resource contention, to improve network air interface synchronization performance.

Accompanying drawing explanation

Fig. 1 be the embodiment of the present invention air interface synchronization in the collocation method step schematic diagram one of signal parameter;

Fig. 2 be the embodiment of the present invention air interface synchronization in the collocation method step schematic diagram two of signal parameter;

Fig. 3 be the embodiment of the present invention air interface synchronization in the collocation method step schematic diagram three of signal parameter;

Fig. 4 be the embodiment of the present invention air interface synchronization in the configuration apparatus structure schematic diagram one of signal parameter;

Fig. 5 be the embodiment of the present invention air interface synchronization in the configuration apparatus structure schematic diagram two of signal parameter;

Fig. 6 be the embodiment of the present invention air interface synchronization in the configuration apparatus structure schematic diagram three of signal parameter;

The multi-hop that Fig. 7 is the embodiment of the present invention synchronizes schematic diagram;

Fig. 8 is the MethodA principle schematic of the embodiment of the present invention;

Fig. 9 is the MethodB principle schematic one of the embodiment of the present invention;

Figure 10 is the MethodB principle schematic two of the embodiment of the present invention;

Figure 11 is the air interface synchronization principle schematic that the embodiment of the present invention is applied;

Figure 12 is the MethodC principle schematic of the embodiment of the present invention.

Detailed description of the invention

For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, it is described in detail below in conjunction with the accompanying drawings and the specific embodiments.

The present invention is directed in existing technology under smallcell super-intensive deployment scenario with the multiple sourcecell of the layer synchronous reference signal (LRS sent, listeningRS) problem interfered caused because of RE resource contention, the collocation method of signal parameter in a kind of air interface synchronization is provided, as it is shown in figure 1, include:

Step 11: configuring the reference signal as LRS for same layer source base station, wherein, the LRS with layer source base station is identical;

Step 12: the LRS identical sub-frame offset of configuration sent for same layer source base station, for the sub-frame offset differently configured for LRS that the source base station of different layers sends;

Step 13: control the sub-frame offset of the LRS that each source base station configures based on self, sends LRS at corresponding subframe position place.

In the described air interface synchronization that the embodiment of the present invention provides, the collocation method of signal parameter strengthens thus obtaining signal diversifying gain by configuring the identical LRS LRS signal additivity each other making same layer source base station send as reference signal for same layer source base station, thus solving in prior art under smallcell super-intensive deployment scenario with the multiple sourcecell of the layer synchronous reference signal (LRS sent, listeningRS) problem interfered caused because of RE resource contention, to improve network air interface synchronization performance.

Concrete, described is by CRS (cell common reference signal Cell-specificreferencesignal) for configuring a kind of method for optimizing as the reference signal of LRS with layer source base station, PRS (location reference signals Positioningreferencesignals) and CSI-RS (CSIreferencesignals, and CSI is the abbreviation of channel condition information Channel-StateInformation) in any one reference signal, configure the reference signal of the LRS as same layer source base station, and be the initial phase that this any one reference signal configuration is identical.

Being not excluded for the reference signal that design is new, when described new reference signal is configured as the reference signal of the LRS of same layer source base station, its sequence generating mode and initial phase are identical.

Wherein, the described initial phase identical for this any one reference signal configuration includes: use radio frame number to replace the base station relevant parameter in initial phase computing formula, to generate identical initial phase.

Preferably, for CRS and PRS, replace Cell-ID parameter by radio frame numberFor CSI-RS, replace the parameter of high level configuration by radio frame number

In order to solve above-mentioned technical problem, the embodiment of the present invention additionally provides the collocation method of signal parameter in a kind of air interface synchronization, as in figure 2 it is shown, include:

Step 21: receive the identical LRS from the multiple source base station of same layer;

Step 22: obtain each self-corresponding source base station from multiple described LRS and send the time, described source base station sends the time with source base station clock for benchmark;

Step 23: obtaining when multiple described LRS arrives each self-corresponding local reception time, the described local reception time is with local clock for benchmark;

Step 24: utilize each self-corresponding described source base station of multiple described LRS to send the time and the local reception time carries out computing and obtains average timing offset estimated value. Wherein, estimated value comprises measurement error value.

In the described air interface synchronization that the embodiment of the present invention provides, the collocation method of signal parameter carries out process by the LRS that multiple same layer source base station are sent and obtains average timing offset estimated value, solve further in prior art under smallcell super-intensive deployment scenario with the multiple sourcecell of the layer synchronous reference signal (LRS sent, listeningRS) problem interfered caused because of RE resource contention, to improve network air interface synchronization performance.

Wherein, multiple described LRS each self-corresponding described source base station transmission time and local reception time is being utilized to carry out also including before computing obtains average timing offset estimated value: to obtain each self-corresponding propagated delay time of multiple described LRS; Described utilizing each self-corresponding described source base station of multiple described LRS to send time and local reception time, computing obtains average timing offset value particularly as follows: utilize each self-corresponding described source base station of multiple described LRS to send time, local reception time and propagated delay time and carry out computing and obtain average timing offset value.

In order to solve above-mentioned technical problem, the embodiment of the present invention additionally provides the collocation method of signal parameter in a kind of air interface synchronization, as it is shown on figure 3, include:

Step 31: configure a LRS pattern for base station, makes the LRS that this base station sends orthogonal with the LRS that other base stations of same layer send;

Step 32: send the LRS through community scrambling according to described LRS pattern.

In the described air interface synchronization that the embodiment of the present invention provides, the collocation method of signal parameter passes through as the LRS pattern differently configured with layer source base station, make that the LRS sent each other is orthogonal to be solved in prior art under smallcell super-intensive deployment scenario with the multiple sourcecell of the layer synchronous reference signal (LRS sent, listeningRS) problem interfered caused because of RE resource contention, to improve network air interface synchronization performance.

Wherein, LRS and the LRS that other base stations of same layer send that this base station sends lays respectively in the GP of the different special subframe in TDD system.

The present invention preferentially adopts distributed LRS mode dispatching mechanism, specifically has two kinds of ways of realization, the first: described configure a LRS pattern for base station and include: send the signaling of the LRS pattern that request feedback uses to the adjacent base station of same layer; Receive the described adjacent base station response message according to described signaling feedback; In local LRS pattern database, a LRS pattern all differed with the LRS pattern of all adjacent base stations is obtained according to described response message.

The second: configure a LRS pattern for base station described in the described collocation method that the embodiment of the present invention provides and comprise determining that candidate's subframe of a LRS to be sent; Described candidate's subframe is intercepted the LRS that other neighbor cells send; If intercepted result is there is the LRS not taken by the LRS of other neighbor cells described in described candidate's subframe to configure resource, it is determined that a unappropriated LRS configures resource; Configure resource according to the described LRS after determining and determine a kind of LRS pattern.

Further, if all available LRS that intercepted result is described candidate's subframe configures resource shared by the LRS of other neighbor cells described, then the described candidate's subframe determining a LRS to be sent is continued executing with.

Wherein, in same bunch, the transmission cycle of all LRS is all identical; If micro-station has switch translation function, then send LRS too even at resting state; LRS has the characteristic point different from other signals, and can by other cell identification adjacent out.

In order to solve above-mentioned technical problem, the embodiment of the present invention additionally provides the configuration device of signal parameter in a kind of air interface synchronization, as shown in Figure 4, and including:

First configuration module, for for configuring the reference signal as LRS with layer source base station, wherein, the LRS with layer source base station is identical;

Second configuration module, for the LRS identical sub-frame offset of configuration for sending with layer source base station, for the sub-frame offset differently configured for LRS that the source base station of different layers sends;

Control module, for controlling the sub-frame offset of the LRS that each source base station configures based on self, send LRS at corresponding subframe position place.

In the described air interface synchronization that the embodiment of the present invention provides, the configuration device of signal parameter strengthens thus obtaining signal diversifying gain by configuring the identical LRS LRS signal additivity each other making same layer source base station send as reference signal for same layer source base station, thus solving in prior art under smallcell super-intensive deployment scenario with the multiple sourcecell of the layer synchronous reference signal (LRS sent, listeningRS) problem interfered caused because of RE resource contention, to improve network air interface synchronization performance.

Concrete, described first configuration module includes: the first dispensing unit, for by CRS (cell common reference signal Cell-specificreferencesignal), PRS (location reference signals Positioningreferencesignals) and CSI-RS (CSIreferencesignals, and CSI is the abbreviation of channel condition information Channel-StateInformation, RS is the abbreviation of reference signal referencesignal) in any one reference signal, configure the reference signal of LRS as same layer source base station; Second dispensing unit, for the initial phase identical for this any one reference signal configuration.

Being not excluded for the reference signal that design is new, when described new reference signal is configured as the reference signal of the LRS of same layer source base station, its sequence generating mode and initial phase are identical.

Wherein, described second dispensing unit includes: replace assembly, for using radio frame number to replace the base station relevant parameter in initial phase computing formula, to generate identical initial phase.

Preferably, for CRS and PRS, replace Cell-ID parameter by radio frame numberFor CSI-RS, replace the parameter of high level configuration by radio frame number

In order to solve above-mentioned technical problem, the embodiment of the present invention additionally provides the configuration device of signal parameter in a kind of air interface synchronization, as it is shown in figure 5, include:

Receiver module, for receiving the identical LRS from the multiple source base station of same layer;

First acquisition module, sends the time for obtaining each self-corresponding source base station from multiple described LRS, and described source base station sends the time with source base station clock for benchmark;

Second acquisition module, is used for obtaining when multiple described LRS arrives each self-corresponding local reception time, and the described local reception time is with local clock for benchmark;

Computing module, is used for utilizing multiple described LRS each self-corresponding described source base station transmission time and local reception time to carry out computing and obtain average timing offset estimated value. Wherein, estimated value comprises measurement error value.

In the described air interface synchronization that the embodiment of the present invention provides, the configuration device of signal parameter carries out process by the LRS that multiple same layer source base station are sent and obtains average timing offset estimated value, solve further in prior art under smallcell super-intensive deployment scenario with the multiple sourcecell of the layer synchronous reference signal (LRS sent, listeningRS) problem interfered caused because of RE resource contention, to improve network air interface synchronization performance.

Wherein, also include: the 3rd acquisition module, before performing operation for described computing module, obtain each self-corresponding propagated delay time of multiple described LRS;

Described computing module specifically for: utilize each self-corresponding described source base station of multiple described LRS to send time, local reception time and propagated delay time and carry out computing and obtain average timing offset value.

In order to solve above-mentioned technical problem, the embodiment of the present invention additionally provides the configuration device of signal parameter in a kind of air interface synchronization, as shown in Figure 6, and including:

3rd configuration module, for configuring a LRS pattern for base station, makes the LRS that this base station sends orthogonal with the LRS that other base stations of same layer send;

Sending module, for sending the LRS through community scrambling according to described LRS pattern.

In the described air interface synchronization that the embodiment of the present invention provides, the configuration device of signal parameter passes through as the LRS pattern differently configured with layer source base station, make that the LRS sent each other is orthogonal to be solved in prior art under smallcell super-intensive deployment scenario with the multiple sourcecell of the layer synchronous reference signal (LRS sent, listeningRS) problem interfered caused because of RE resource contention, to improve network air interface synchronization performance.

Wherein, LRS and the LRS that other base stations of same layer send that this base station sends lays respectively in the GP of the different special subframe in TDD system.

The present invention preferentially adopts distributed LRS mode dispatching mechanism, specifically has two kinds of ways of realization, the first: described 3rd configuration module includes: the first transmitting element, for sending the signaling of the LRS pattern that request feedback uses to the adjacent base station of same layer; Receive unit, for receiving the described adjacent base station response message according to described signaling feedback; Acquiring unit, for obtaining a LRS pattern all differed with the LRS pattern of all adjacent base stations according to described response message in local LRS pattern database.

The second, described in the described configuration device that the embodiment of the present invention provides, the 3rd configuration module includes: first determines unit, for determining candidate's subframe of a LRS to be sent; Second transmitting element, for intercepting the LRS that other neighbor cells send in described candidate's subframe; Second determines unit, if being there is the LRS not taken by the LRS of other neighbor cells described in described candidate's subframe to configure resource for intercepted result, it is determined that a unappropriated LRS configures resource; 3rd determines unit, determines a kind of LRS pattern for configuring resource according to the described LRS after determining.

Further, also including: loop module, if configuring resource all shared by the LRS of other neighbor cells described for all available LRS that intercepted result is described candidate's subframe, then continuing executing with the described candidate's subframe determining a LRS to be sent.

Wherein, in same bunch, the transmission cycle of all LRS is all identical; If micro-station has switch translation function, then send LRS too even at resting state; LRS has the characteristic point different from other signals, and can by other cell identification adjacent out.

In the described the air interface synchronization below embodiment of the present invention provided, the collocation method of signal parameter is specifically described.

MethodA: sending identical LRS signal with the multiple sourcecell of layer in same LRS transmission subframe, namely these have identical pseudo-code sequence with the LRS signal of layer community, take identical RE resource.

Ultimate principle:

Sending identical LRS signal with the multiple sourcecell of layer in same LRS transmission subframe, namely these have identical pseudo-code sequence with the LRS signal of layer community, take identical RE resource.

Targetcell sends in subframe at above-mentioned LRS and carries out network intercepting, and the signal received is the superposition in time domain of multiple sourcecell LRS signal (being referred to as LRS component) sent.

Targetcell estimates the time of advent (TOA) of all of LRS component by time-domain related calculation (or other similar computings), but owing to the pseudo-code sequence of all of LRS component is all identical, therefore targetcell cannot correctly identify what these LRS components with the different time of advent specifically from which sourcecell sent.

Paying close attention to the node eNB2-2 of stratumlevel (synchronization levels)=2 in Fig. 7, it sends subframe at the LRS of stratumlevel=1 and receives the LRS signal of three sourcecell of upper hop (stratumlevel=1) (being eNB1-1, eNB1-2, eNB1-3 respectively) simultaneously. These LRS signals have identical pseudo-code sequence and running time-frequency resource.

Succinct in order to describe, respectively sourcecelleNB1-1, eNB1-2 and eNB1-3 are denoted as S1, S2 and S3, targetcelleNB2-2 is denoted as targetcellT. As shown in Figure 8, sourcecellS1, S2 and S3 send LRS signal local moment 0 (LRS sends subframe). Due to the timing synchronization errors of S1, S2 and S3 self, using GNSS timing (GNSStiming) as with reference to timing (referencetiming), LRS signal actual delivery time respectively t_TX1=��_S1��t_TX2=��_S2And t_TX3=��_S3. The initial timing synchronization error of hypothesis targetcellT self is t simultaneously_target=��_T. Consider S1, S2 and the S3 propagated time delay �� to targetcellT_S1����_S2And ��_S3, then the LRS signal of S1, S2 and the S3 transmission represented time with GNSS arrives the respectively t time of advent of targetcellT_RX1=��_S1+��_S1��t_RX2=��_S2+��_S2And t_RX3=��_S3+��_S3��

The signal that targetcellT receives is actually S1, S2 and S3 and sends the combination in time domain of the LRS signal, the time of advent represented when each LRS component is with GNSS in Fig. 8 shown in the image in receiversigT respective shaft, respectively t_RX1=��_S1+��_S1��t_RX2=��_S2+��_S2And t_RX3=��_S3+��_S3��

As shown in Figure 8, each receives time of arrival (toa) (TOA) the respectively TOA that component of signal represents with targetcell local zone time_RX1=t_RX1-t_target=(��_S1-��_T)+��_S1��TOA_RX2=t_RX2-t_target=(��_S2-��_T)+��_S2And TOA_RX3=t_RX3-t_target=(��_S3-��_T)+��_S3��

TargetcellT firstly generates this locality reproduction signal replica of LRS, then replica is done time domain relevant treatment (or other similar computings) with receiving signal, can obtaining synthesis correlation function combinationACF, curve trend is in Fig. 8 shown in the image in combinationACFT respective shaft. The signal propagation time that its transverse axis position corresponding to ACF peak of function represents when representing with targetcell this locality. By the peak value position of ACF function, it is possible to the estimator of the time of arrival (toa) TOA represented when estimating with targetcell this localityNamelyWherein ��_S1����_S2And ��_S3Represent TOA estimation difference (i.e. error in measurement). Assume that ��_S1����_S2And ��_S3It is independently distributed, and average is 0.Namely it is the targetcell original time difference measurement amount obtained.

TargetcellT finally TOA information according to each LRS component above-mentioned, and some other auxiliary information, generate the estimated value of timing offsetMake to be approximately equal to the average timing offset of upper hop source base station. When obtaining timing offset estimatorAfter, targetcell according toCalibration local clock so that it is with the average timing offset approximately equal of upper hop source base station, namely achieve adjacent 2 jump base stations clock synchronizing functions.

Propagated time delay �� as all sourcecell_SiWhen can be almost completely neglected, haveWithAt this moment the timing offset of simple formula averaged power spectrum targetcell can be passed through, namely

Timing relationship:

Timing offset estimator:

Wherein,Represent definition, E{ } represent and average, and measure the average E{ �� of noise_Si}=0. Therefore the physical meaning of above formula is, as propagated time delay ��_SiWhen can be left in the basket, it is possible to by the timing offset estimator of targetcellIt is defined as the average of TOANegative, and according to the timing offset estimator that this definition is calculatedIt is approximately equal to the true timing offset �� of targetcell_TAverage E{ �� with the timing offset of all source base stations of upper hop_SiDifference. ObtainAfter, targetcell is by local clock adjustmentMake the local clock timing offset after calibrationIt is approximately equal to the average E{ �� of the timing offset of all source base stations of upper hop_Si, namely ${\mathrm{\δ}}_T^{\mathrm{correct}}\stackrel{\mathrm{\Δ}}{=}{\mathrm{\δ}}_T-{\widehat{\mathrm{\δ}}}_T=E\left\{{\mathrm{\δ}}_{\mathrm{Si}}\right\}.$

But, as the propagated time delay �� of sourcecell_SiRelatively big, and when can not be left in the basket, then can not be the timing offset estimator that average algorithm estimates targetcell by simple TOABut owing to the LRS sequence of all LRS components is all identical in MethodA, therefore targetcellT is difficult to be mapped LRS component with specific sourcecell, is namely difficult with prior information (such as propagated time delay ��_Si) be calibrated (meaning alignment path propagation delay �� to the TOA estimated value of LRS component_SiImpact on TOA measuring amount). As some sourcecell propagated time delay ��_SiTime bigger, it is possible to targetcellT timing offset algorithm for estimating can be caused bigger system deviation. Below according to the application scenarios that 3 classes are different, provide different timing offset methods of estimation.

Sourcecell side processes:

The sourcecell of identical stratumlevel uses identical LRS sub-frame offset (subframeoffset), and different stratumlevel uses different LRSsubframeoffset.

The sourcecell of identical stratumlevel sends in subframe at same LRS and sends identical LRS signal, and namely these have identical pseudo-code sequence with the LRS signal of layer community, take identical RE resource. Therefore, LRS signal herein is unrelated with cellID.

A kind of embodiment is by radio frame number (SFN) scrambling by LRS, but not cellID (cell number) scrambling.

[embodiment 1] such as, when LRS signal is CSI-RS (CSIreferencesignals, and CSI is the abbreviation of channel condition information Channel-StateInformation, RS is the abbreviation of reference signal referencesignal) time, the first phase (initial phase computing formula) of its pseudo-code sequence is

$c_{\mathrm{init}}=2^{10}\·(7\·(n_s+1)+l+1)\·(2\·N_{\mathrm{ID}}^{\mathrm{CSI}}+1)+2\·N_{\mathrm{ID}}^{\mathrm{CSI}}+N_{\mathrm{CP}},$

Wherein, $N_{\mathrm{CP}}=\left\{\begin{array}{cc}1& \mathrm{for\; normal\; CP}\\ 0& \mathrm{for\; extended\; CP}\end{array}\right.$

Wherein, n_sBeing the time-gap number (Slotnumberwithinaradioframe) in radio frames, l is OFDM symbol numbering (OFDMsymbolnumberwithintheslot) in a time slot,CSI for community numbers; N_CPFor cyclic prefix type parameter, when using normal cyclic prefix (normalCP), N_CP=1, otherwise, when using extended cyclic prefix (extendedCP), N_CP=0; c_initInitial phase for pseudo-random sequence.

Can by hereIt is configured to No. SFN by high-level signaling. This embodiment need not revise existing standard.

[embodiment 2], when LRS signal is CRS (cell common reference signal Cell-specificreferencesignal) or PRS (location reference signals Positioningreferencesignals), the first phase (initial phase computing formula) of its pseudo-code sequence is

$c_{\mathrm{init}}=2^{10}\·(7\·(n_s+1)+l+1)\·(2\·N_{\mathrm{ID}}^{\mathrm{cell}}+1)+2\·N_{\mathrm{ID}}^{\mathrm{cell}}+N_{\mathrm{CP}}$

Major parameter is as above identical, and the main distinction isRepresent cell number (cellID). The present embodiment requires in amendment LRS formation sequence first phase cinitParameter, willIt is revised as No. SFN.

If LRS uses other reference signal, can similar configuration.

Targetcell side processes:

Different according to smallcell deployment scenario, the processing mode of targetcell side also can difference to some extent. 3 class major deployments scenes can be divided into:

First kind deployment scenario: all targetcell can find one apart from oneself very near sourcecell, and propagated time delay between the two can be ignored.

According to it is assumed that (n-1)th jumps all source base stations shortest path propagation delay �� to the n-th jumping targetcell_S1Can be left in the basket, it is possible to defined the timing offset estimator of the n-th jumping targetcell by two kinds of methods

The first: received signal power thresholding is set. Specifically, when the ACF peak power of LRS component is lower than certain thresholding, this LRS component is not involved in targetcellT timing offset and estimates. This received signal power thresholding can be certain absolute power level, it is also possible to be receive power certain relative power value as basis reference using a LRS component. Mathematic(al) representation is:

The timing offset estimator of targetcell

Wherein, mean represents and seeks arithmetic mean, and the related power of M the LRS component that the textual representation below mean participates in average calculating operation both is greater than equal to certain specific thresholding. Owing to propagated time delay is more big, the power attenuation receiving signal is also more big, causes that related power reduces. Therefore by arranging above-mentioned thresholding, it is ensured that the propagated time delay �� of the source base station of all participation average calculating operations_SiAll smaller, and then can be left in the basket, i.e. ��_Si��0��

Below the calculating formula of TOA is updated to above-mentionedDefinition in, analyze above-mentionedThe inner principle of definition. KnownThen

I.e. timing offset estimatorIt is approximately equal to the true timing offset �� of targetcell_TAverage E{ �� with the timing offset of all source base stations of upper hop_SiDifference. ObtainAfter, targetcell is by local clock adjustmentMake the local clock timing offset after calibrationIt is approximately equal to the average E{ �� of the timing offset of all source base stations of upper hop_Si, namely ${\mathrm{\δ}}_T^{\mathrm{correct}}\stackrel{\mathrm{\Δ}}{=}{\mathrm{\δ}}_T-{\widehat{\mathrm{\δ}}}_T=E\left\{{\mathrm{\δ}}_{\mathrm{Si}}\right\}.$

The second: received signal power weighting. Specifically, when doing targetcellT timing offset and estimating, the reception power P of LRS component is utilized_iTo TOA estimator TOA_RXiWeighting. Receive power P_iIt is more big,Weight also more big. A kind of possible mathematic(al) representation is

The timing offset of targetcell

Wherein, g () is certain increasing function.

Owing to propagated time delay is more big, the power attenuation receiving signal is also more big, causes that related power reduces. Therefore by arranging above-mentioned thresholding, it is ensured that propagated time delay ��_SiBig source base station is relatively small to the weighted contributions of the timing offset estimator of targetcell, and the propagated time delay �� of the relatively large source base station of weighted contributions_SiAll smaller, finally total propagated delay can be left in the basket.

Below the calculating formula of TOA is updated to above-mentionedDefinition in, analyze above-mentionedThe inner principle of definition. KnownThen

Then

$\begin{array}{c}E\left\{{\widehat{\mathrm{\δ}}}_T\right\}={\mathrm{\δ}}_T-\frac{\underset{i}{\mathrm{\Σ}}\left[g\left(P_i\right)E\right\{{\mathrm{\δ}}_{\mathrm{Si}}\left\}\right]}{\underset{i}{\mathrm{\Σ}}g\left(P_i\right)}-\frac{\underset{i}{\mathrm{\Σ}}\left[g\left(P_i\right)E\right\{{\mathrm{\τ}}_{\mathrm{Si}}\left\}\right]}{\underset{i}{\mathrm{\Σ}}g\left\{P_i\right\}}-\frac{\underset{i}{\mathrm{\Σ}}\left[g\left(P_i\right)E\right\{{\mathrm{\ϵ}}_{\mathrm{Si}}\left\}\right]}{\underset{i}{\mathrm{\Σ}}g\left(P_i\right)}\\ ={\mathrm{\δ}}_T-E\left\{{\mathrm{\δ}}_{\mathrm{Si}}\right\}-\frac{\underset{i}{\mathrm{\Σ}}\left[g\left(P_i\right)E\right\{{\mathrm{\τ}}_{\mathrm{Si}}\left\}\right]}{\underset{i}{\mathrm{\Σ}}g\left(P_i\right)}\end{array}$

Based on the assumption that, propagated time delay ��_SiThe big source base station weighted contributions g (P to the timing offset estimator of targetcell_i) relatively small, and the propagated time delay �� of the relatively large source base station of weighted contributions_SiAll smaller, therefore

May finally obtainI.e. timing offset estimatorIt is approximately equal to the true timing offset �� of targetcell_TAverage E{ �� with the timing offset of all source base stations of upper hop_SiDifference. ObtainAfter, targetcell is by local clock adjustmentMake the local clock timing offset after calibrationIt is approximately equal to the average E{ �� of the timing offset of all source base stations of upper hop_Si, namely

Equations of The Second Kind deployment scenario: only the 0th jumping base station (such as macro station) is relatively big to the propagated time delay of the 1st jumping base station (smallcell), can not be left in the basket; And n-th jumps base station (n >=1) and can be left in the basket to the (n+1)th propagated time delay of a LRS component jumping base station (smallcell).

Under this application scenarios, it is possible to estimated the timing offset of the 1st jumping base station and the timing offset of the n-th jumping (n >=2) respectively by diverse ways.

Introduce the method for estimation of the timing offset of the 1st jumping base station first below. Under this application scenarios, it is possible to jump base station (such as macro station) by only having 1 the 0th in one cluster of configuration requirement, then the 1st targetcell jumped can measure the propagated time delay �� of itself and the 0th jumping base station in advance by realizing class method_S1, its TOA relational expression is:Therefore the timing offset estimator of definable targetcellIt is defined as with propagated time delay ��_S1The TOA calibrated, it may be assumed thatThe timing offset �� of the 0th jumping base station (such as macro station) might as well be set_S1It is approximately 0, Timing measurement error ��_S1Average be 0, then haveI.e. targetcell timing offset estimatorIt is approximately equal to real timing offset.

And n-th jumps the timing offset method of estimation of (n >=2) base station with first kind deployment scenario.

3rd class deployment scenario: except the 0th jumps base station (such as macro station) and can not ignore to the 1st propagated time delay jumping base station (smallcell), and n-th jumps base station (n >=1) and also can not be left in the basket to the (n+1)th propagated time delay of a LRS component jumping base station (smallcell).

In this application scenarios, the 0th synchronous method jumping to the 1st jumping is referred to Equations of The Second Kind deployment scenario.

Mainly explained below n-th jumps the base station (n >=1) synchronous method to the (n+1)th jumping base station (smallcell). When the propagated time delay of a LRS component be can not ignore, need it is calibrated (namely all plus the propagated time delay of a LRS component, be equivalent to and got rid of from targetcell timing offset estimator by the propagated delay of a LRS component).

Process step is as follows:

Step1:targetcell measures the propagated time delay of itself and all adjacent base stations in advance by realizing class method, and make the mapping table of propagated time delay and base station pair, mapping table format can be<propagated time delay, fromcellID, tocellID>. This measurement work can carry out when this targetcell is restarted. Can every day/weekly in the late into the night when UE business is inactive, restart all base stations in whole cluster successively, and measure propagated time delay between any two;

Step2:targetcell selects synchronisation source sourcecell. Specifically chosen method is referred to existing 3GPP standard. If the stratumlevel of sourcecell is n-1, then the stratumlevel of this targetcell is configured to n;

Step3:targetcell obtains sourcecell and sends the offset of LRS subframe. Targetcell obtains the cellID set of the adjacent sourcecell of stratumlevel=n-1 further. Targetcell can pass through blind check PSS/SSS signal in Step2, or backhaul signaling (as by X2/S1 interface) obtains the cellID information of above-mentioned adjacent sourcecell. The targetcell cellID set according to the adjacent sourcecell obtained, search mapping table<the propagated time delay of the Step1 propagated time delay determined and base station pair, fromcellID, tocellID>, it is thus achieved that the shortest path �� of the adjacent sourcecell of targetcell to stratumlevel=n-1_min;

Step4: the same to first kind, for the impact suppressing the LRS component with larger path propagation delay that targetcellT timing offset is estimated, it is possible to adopt two kinds of technological means:

Received signal power thresholding is set, then defines

The timing offset of targetcell

Received signal power weighting, namely defines ${\widehat{\mathrm{\&delta;}}}_T=\frac{\underset{i}{\mathrm{\&Sigma;}}[g\left(P_i\right)\&times;(-\mathrm{TO}{A}_{\mathrm{RXi}}+{\mathrm{\&tau;}}_{\min })]}{\underset{i}{\mathrm{\&Sigma;}}g\left(P_i\right)}$

The timing offset of targetcell

Wherein, g () is certain increasing function. The definition of other functions is referred to first kind deployment scenario. Wherein, ��_minNeed not be equal to the propagated time delay of a LRS component, but be in general obtained in that good propagated delay calibration and air interface synchronization performance.

MethodB: with the multiple sourcecell of layer as required, sends the LRS signal of community scrambling in identical or different descending sub frame, and by suitable scheduling mechanism, it is ensured that orthogonal from the LRS signal of same layer difference sourcecell. When normal operation (non-step-out), targetcell only can intercept the LRS signal of a synchronisation source every time, to maintain air interface synchronization.

In the embodiment of the present invention, the core concept of MethodB is a stratumlevel and a LRSsubframeoffsetrange binding; So just can suppress the interference between same layer LRS signal completely.

As shown in Figure 9 and Figure 10, in identical or different descending sub frame, the LRS of community scrambling is sent with the multiple sourcecell of layer. Wherein, the LRS signal of community scrambling can be legacy (traditional) RS (reference signal), and such as CRS, PRS, CSI-RS etc., LRS signal can also be newly-designed reference signal.

Orthogonal in order to ensure the LRS signal from the multiple sourcecell of same layer, it is possible to RE (resourceelement/ resource element) resource corresponding to LRS signal is staggered by the frequency dimension in subframe dimension and/or subframe and/or the OFDM in subframe (OFDM) symbol dimension. Skew includes time domain skew (sub-frame level skew and symbol offset-OFDM symbol skew) and frequency offset (i.e. frequency shift (FS)/sub-carrier offset).

Especially, different LRS signals has different frequencies dimension reusing degree (namely being staggered by LRS signal) by sub-carrier offset on frequency domain, for instance the frequency dimension reusing degree of 2 port CRS is 3, PRS frequency dimension reusing degrees is 6. When same layer sourcecell too much to such an extent as to its LRS signal cannot in same subframe orthogonal send time, it is possible to introducing new multiplexing dimension sub-frame offset dimension to ensure the orthogonality of LRS signal, concrete offset method is as shown in Figure 9 and Figure 10.

(muting) mechanism of mourning in silence between different stratumlevel can ensure that and better synchronizes to intercept performance. Fig. 9 and Figure 10 gives muting mechanism two kinds different. Fig. 9 (Opt1) represents the whole muting of cross-layer, namely on whichever stratumlevel, subframe sends LRS signal, all mourning in silence (not sending data) at identical subframe place in all base stations of other stratumlevel, intercepts performance avoiding interference LRS signal. Figure 10 (Opt2) represents that adjacent bed intercepts muting, namely when n-th layer base station sends LRS signal, mourns in silence for the n-th+2 layers, and the LRS signal to avoid interference (n+1)th layer intercepts performance.

Coordinate LRS each other with the multiple base station of layer by mutual backhaul signaling and send resource (include sending subframe, and send the sub-carrier offset within subframe and OFDM symbol), to ensure that the RE resource corresponding to LRS signal each other staggers.

Several feasible scheduling mechanism is exemplified below, to ensure to stagger on different running time-frequency resources transmission from the LRS signal of the different sourcecell of same layer.

Option1: adopt centralized listeningRSpattern (pattern) scheduling mechanism: there is certain central controller and manage the listeningRSpattern of all eNB target BS concentratedly, and ensure its orthogonality. Specifically, a LRSpattern data base safeguarded by central controller.

1. when a base station wants to determine where oneself sends LRS signal, first it send a demand signalling to central controller, a kind of LRSpattern being not result in conflict of request feedback;

2. central controller is according to the LRSpattern data base safeguarded, select one with the LRSpattern of all existing base stations LRSpattern not conflicted, and by this information by signaling feedback give request base station;

3. the LRSpattern fed back is added in LRSpattern data base by central controller, to carry out the updating maintenance of data base;

4. the LRSpattern that request base station is fed back according to central controller sends LRS signal;

5. request and feedback signaling described in can pass through backhaul (such as S1 interface, X2 interface) transmission;

6. LRSpattern described at least needs to include the information such as LRS sub-frame offset and LRS signal repetition period.

Option2: adopt distributed listeningRSpattern scheduling mechanism, has two kinds of realization mechanisms.

Alt1: based on backhaul (backhaul) signaling. Each eNB seeks advice from the LRS configuration information of adjacent or all base stations by backhaul signaling, and to determine the LRS configuration information of oneself, to ensure the LRS signal in orthogonal with other eNB, concrete steps include:

1., when a base station wants to determine where oneself sends LRS signal, first it send a demand signalling to adjacent base station, and request the other side feeds back its LRSpattern used;

2. adjacent base station makes sound and ask, and the LRSpattern self used feeds back to request base station;

3. request base station according to all adjacent base station LRSpattern information collected, safeguard a local LRSpattern data base, then according to this data base select one with the LRSpattern of all adjacent base stations LRSpattern not conflicted;

4. request base station sends LRS signal according to the LRSpattern currently chosen.

Alt2: each eNB first passes through the LRS signal eating dishes without rice or wine to intercept (blind check) other eNB, is then based on the LRS configuration information of intercepted result configuration oneself, to ensure the LRS signal in orthogonal with other eNB. Concrete steps include:

1. when a base station (being called current base station) wants to determine where oneself sends LRS signal, first it determine candidate's subframe of a LRS signal to be sent, then intercepts the LRS signal (blind check) that other neighbor cells send in this candidate's subframe;

2., in order to avoid intercepting the process impact on current base station UE business, configurable one of current base station measures interval (measurementgap). Specifically, this measurement interval can be configured to MBSFM (multicast/multicast single-frequency network network) subframe;

3. if by blind check, current base station finds that all available LRS of this candidate's subframe configures resource shared by the LRS signal of other communities, then current base station chooses candidate's subframe of a LRS signal to be sent again, then re-executes step 1;

4. otherwise, if finding that this candidate's subframe is not shared by the LRS signal of other communities by blind check, then current base station will take this subframe, and select a unappropriated LRS to configure resource transmission LRS signal.

Separately, extra requirement is listened in order to avoid leakage, is additionally required satisfied following constraints:

Constraint 1: in same cluster (bunch), the transmission cycle of all listeningRS is all identical;

Constraint 2: if there is the smallcell with on/offswitching function, then require that offcell also needs to send listeningRS;

Constraint 3:LRS is required to non-LRS signal distinguishing out, for instance, LRS signal is newly-designed reference signal, and can by other community blind checks adjacent out.

MethodC: with the multiple sourcecell of layer as required, different descending sub frames sends the LRS signal of community scrambling, and LRS signal only sends in the special subframe of TDD system, and by the scheduling mechanism identical with MethodB, it is ensured that orthogonal from the LRS signal of same layer difference sourcecell. The concrete configuration of its LRS signal is referring to the scheme in patent application 201410035839.9, as follows:

One utilizes the GP (protection interval) of TDD (time division duplex) special subframe to send the air interface synchronization scheme of LRS signal, and as shown in figure 11, TDDsourcecell sends LRS signal in the GP of special subframe. A kind of possible embodiment is: the uplink and downlink timeslot proportioning of special subframe is 9:3:2, wherein descending DwPTS (descending pilot frequency time slot) takies 9 OFDM symbol, GP takies 3 OFDM symbol, and up UpPTS (uplink pilot time slot) takies 2 OFDM symbol. Sourcecell utilizes first OFDM symbol of GP to send LRS signal. This LRS signal can be the legacyRS (such as CRS, PRS, CSI-RS etc.) cut out, so-called cutting out refers to only transmission legacy (tradition) RS (reference signal) signal in this LRS transmission OFDM symbol, does not send data in other OFDM symbol.

Scheme as shown in figure 11 make use of the advantage not transmitting data on the GP of TDD special subframe cleverly, it is possible to is automatically obtained cross-layer entirety and mourns in silence function. Therefore the program has and synchronizes preferably to intercept performance.

On the other hand, the program is fully transparent to UE, has desirable backwards compatibility.

But, scheme as shown in figure 11 has certain overhead, namely require that all of base station all retains (vacating) several (>=1) OFDM symbol in GP and is used for sending/intercept LRS signal, it is possible to certain resource overhead and waste can be caused. But, (such as=1) if the OFDM symbol number that LRS signal takies is less, then affect service rate hardly, because service rate is determined by TBS (transport block size), and whether less on TBS impact the use of an OFDM symbol is, such as, uplink and downlink timeslot proportioning 9:3:2 (scheme in patent application 201410035839.9 adopts) and 10:2:2 (contrast scheme, the LRS of 1 OFDM symbol is discharged as service communication) the systematic TBS of general tool, therefore both service rates are identical. Certainly, although both TBS are identical, but both transmission bit sizes are different, and this can affect coding/decoding performance. Therefore in patent application 201410035839.9, the overhead of scheme can be expressed as: under TBS (the being reflected as service rate) premise being held essentially constant, coding/decoding performance (is reflected as robustness) and slightly declines.

Scheme shown in Figure 11, for smallcell super-intensive deployment scenario, from stratumlevel and subframe offset mapping angle, is strengthened by MethodC.

As shown in figure 12, by suitable scheduling mechanism, a synchronization levels is corresponding with certain LRS sub-frame offset set, it is ensured that in different descending sub frames, send the LRS signal of community scrambling with the multiple sourcecell of layer.

On the basis of MethodB, these association scheme can be automatically obtained cross-layer muting mechanism, therefore need not introduce extra overhead, achieve further excellent results.

To sum up, when the more dense deployment scenario of the smallcell that faces the future (such as 5GUDN:ultradensenetwork super-intensive network), it is likely to have more than 60 smallcell in one cluster, often jump the smallcell that (layer) is likely to have more than 7, if according to existing RIBS technology, namely in same subframe, the LRS signal of respective cellID scrambling is sent respectively with layer base station, then owing to same layer sourcecell number has exceeded the reusing degree of LRS signal, even if these LRS signals also are difficult to stagger completely in RE resource by plot planning, therefore can interfere and reduce network air interface synchronization performance.

And the problem that the embodiment of the present invention interferes for the multiple sourcecell of same layer existed in air interface synchronization application under the smallcell super-intensive deployment scenario LRS signal sent, it is proposed that 3 kinds of RIBS parameter configuration schemes and embodiment:

MethodA: sending identical LRS signal with the multiple sourcecell of layer in same LRS transmission subframe, namely these have identical sequence with the LRS signal of layer community, take identical RE resource.

MethodB: with the multiple sourcecell of layer as required, sends the LRS signal of community scrambling in identical or different descending sub frame, and by suitable scheduling mechanism, it is ensured that orthogonal from the LRS signal of same layer difference sourcecell.

MethodC: namely MethodB is sent with the scheme in patent application 201410035839.9 in the GP of TDD special subframe the RIBS scheme of LRS signal and combines and define a kind of new synchronization levels and LRS and send the corresponding relation of subframe offset (being called for short LRS sub-frame offset), namely by suitable scheduling mechanism, by a synchronization levels and certain LRS sub-frame offset set (LRSsubframeoffsetrange, and offset number >=1 in set) corresponding, to ensure that the multiple sourcecell of same layer sends the LRS signal of community scrambling in different descending sub frames.

The RIBS parameter configuration technology that the embodiment of the present invention provides, can solve to interfere problem with the multiple sourcecell of the layer synchronous reference signal sent because of what RE resource contention caused under smallcell super-intensive deployment scenario, such that it is able to air interface synchronization performance between the station under effective guarantee smallcell super-intensive deployment scenario.

Above-described is the preferred embodiment of the present invention; should be understood that the ordinary person for the art; without departing under principle premise of the present invention, it is also possible to making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (22)

1. the collocation method of signal parameter in an air interface synchronization, it is characterised in that including:

Configuring the reference signal as LRS for same layer source base station, wherein, the LRS with layer source base station is identical;

For the LRS identical sub-frame offset of configuration that same layer source base station sends, for the sub-frame offset differently configured for LRS that the source base station of different layers sends;

Control the sub-frame offset of the LRS that each source base station configures based on self, send LRS at corresponding subframe position place.

2. collocation method as claimed in claim 1, it is characterised in that described for including as the reference signal of LRS with the configuration of layer source base station:

By any one reference signal in CRS, PRS and CSI-RS, configure the reference signal of the LRS as same layer source base station, and be the initial phase that this any one reference signal configuration is identical.

3. collocation method as claimed in claim 2, it is characterised in that the described initial phase identical for this any one reference signal configuration includes:

Radio frame number is used to replace the base station relevant parameter in initial phase computing formula, to generate identical initial phase.

4. the collocation method of signal parameter in an air interface synchronization, it is characterised in that including:

Receive the identical LRS from the multiple source base station of same layer;

Obtaining each self-corresponding source base station from multiple described LRS and send the time, described source base station sends the time with source base station clock for benchmark;

Obtaining when multiple described LRS arrives each self-corresponding local reception time, the described local reception time is with local clock for benchmark;

Utilize each self-corresponding described source base station of multiple described LRS to send the time and the local reception time carries out computing and obtains average timing offset estimated value.

5. collocation method as claimed in claim 4, it is characterised in that carry out also including before computing obtains average timing offset estimated value utilizing multiple described LRS each self-corresponding described source base station transmission time and local reception time:

Obtain each self-corresponding propagated delay time of multiple described LRS;

Described utilize each self-corresponding described source base station of multiple described LRS to send time and local reception time, computing obtain average timing offset value particularly as follows:

Utilize each self-corresponding described source base station of multiple described LRS to send time, local reception time and propagated delay time to carry out computing and obtain average timing offset value.

6. the collocation method of signal parameter in an air interface synchronization, it is characterised in that including:

Configure a LRS pattern for base station, make the LRS that this base station sends orthogonal with the LRS that other base stations of same layer send;

The LRS through community scrambling is sent according to described LRS pattern.

7. collocation method as claimed in claim 6, it is characterised in that LRS and the LRS that other base stations of same layer send that this base station sends lays respectively in the GP of the different special subframe in TDD system.

8. collocation method as claimed in claim 6, it is characterised in that described configure a LRS pattern for base station and include:

The signaling of the LRS pattern that request feedback uses is sent to the adjacent base station of same layer;

Receive the described adjacent base station response message according to described signaling feedback;

In local LRS pattern database, a LRS pattern all differed with the LRS pattern of all adjacent base stations is obtained according to described response message.

9. collocation method as claimed in claim 6, it is characterised in that described configure a LRS pattern for base station and include:

Determine candidate's subframe of a LRS to be sent;

Described candidate's subframe is intercepted the LRS that other neighbor cells send;

If intercepted result is there is the LRS not taken by the LRS of other neighbor cells described in described candidate's subframe to configure resource, it is determined that a unappropriated LRS configures resource;

Configure resource according to the described LRS after determining and determine a kind of LRS pattern.

10. collocation method as claimed in claim 9, it is characterised in that also include:

If all available LRS that intercepted result is described candidate's subframe configures resource shared by the LRS of other neighbor cells described, then continue executing with the described candidate's subframe determining a LRS to be sent.

11. collocation method as claimed in claim 9, it is characterised in that in same bunch, the transmission cycle of all LRS is all identical; If micro-station has switch translation function, then send LRS too even at resting state; LRS has the characteristic point different from other signals, and can by other cell identification adjacent out.

12. the configuration device of signal parameter in an air interface synchronization, it is characterised in that including:

First configuration module, for for configuring the reference signal as LRS with layer source base station, wherein, the LRS with layer source base station is identical;

Second configuration module, for the LRS identical sub-frame offset of configuration for sending with layer source base station, for the sub-frame offset differently configured for LRS that the source base station of different layers sends;

Control module, for controlling the sub-frame offset of the LRS that each source base station configures based on self, send LRS at corresponding subframe position place.

13. configure device as claimed in claim 12, it is characterised in that described first configuration module includes:

First dispensing unit, for by any one reference signal in CRS, PRS and CSI-RS, configuring the reference signal of the LRS as same layer source base station;

Second dispensing unit, for the initial phase identical for this any one reference signal configuration.

14. configure device as claimed in claim 13, it is characterised in that described second dispensing unit includes:

Replace assembly, for using radio frame number to replace the base station relevant parameter in initial phase computing formula, to generate identical initial phase.

15. the configuration device of signal parameter in an air interface synchronization, it is characterised in that including:

Receiver module, for receiving the identical LRS from the multiple source base station of same layer;

First acquisition module, sends the time for obtaining each self-corresponding source base station from multiple described LRS, and described source base station sends the time with source base station clock for benchmark;

Second acquisition module, is used for obtaining when multiple described LRS arrives each self-corresponding local reception time, and the described local reception time is with local clock for benchmark;

Computing module, is used for utilizing multiple described LRS each self-corresponding described source base station transmission time and local reception time to carry out computing and obtain average timing offset estimated value.

16. configure device as claimed in claim 15, it is characterised in that also include:

3rd acquisition module, obtains each self-corresponding propagated delay time of multiple described LRS before performing operation for described computing module;

Described computing module specifically for:

Utilize each self-corresponding described source base station of multiple described LRS to send time, local reception time and propagated delay time to carry out computing and obtain average timing offset value.

17. the configuration device of signal parameter in an air interface synchronization, it is characterised in that including:

3rd configuration module, for configuring a LRS pattern for base station, makes the LRS that this base station sends orthogonal with the LRS that other base stations of same layer send;

Sending module, for sending the LRS through community scrambling according to described LRS pattern.

18. configure device as claimed in claim 17, it is characterised in that LRS and the LRS that other base stations of same layer send that this base station sends lays respectively in the GP of the different special subframe in TDD system.

19. configure device as claimed in claim 17, it is characterised in that described 3rd configuration module includes:

First transmitting element, for sending the signaling of the LRS pattern that request feedback uses to the adjacent base station of same layer;

Receive unit, for receiving the described adjacent base station response message according to described signaling feedback;

Acquiring unit, for obtaining a LRS pattern all differed with the LRS pattern of all adjacent base stations according to described response message in local LRS pattern database.

20. configure device as claimed in claim 17, it is characterised in that described 3rd configuration module includes:

First determines unit, for determining candidate's subframe of a LRS to be sent;

Second transmitting element, for intercepting the LRS that other neighbor cells send in described candidate's subframe;

Second determines unit, if being there is the LRS not taken by the LRS of other neighbor cells described in described candidate's subframe to configure resource for intercepted result, it is determined that a unappropriated LRS configures resource;

3rd determines unit, determines a kind of LRS pattern for configuring resource according to the described LRS after determining.

21. configure device as claimed in claim 20, it is characterised in that also include:

Loop module, if configuring resource all shared by the LRS of other neighbor cells described for all available LRS that intercepted result is described candidate's subframe, then continues executing with the described candidate's subframe determining a LRS to be sent.

22. configure device as claimed in claim 20, it is characterised in that in same bunch, the transmission cycle of all LRS is all identical; If micro-station has switch translation function, then send LRS too even at resting state; LRS has the characteristic point different from other signals, and can by other cell identification adjacent out.