CN104735774A

CN104735774A - Radio resource synchronization method and device based on networking

Info

Publication number: CN104735774A
Application number: CN201510127870.XA
Authority: CN
Inventors: 朱宏
Original assignee: Comba Telecom Technology Guangzhou Ltd
Current assignee: Comba Network Systems Co Ltd
Priority date: 2015-03-23
Filing date: 2015-03-23
Publication date: 2015-06-24
Anticipated expiration: 2035-03-23
Also published as: CN104735774B

Abstract

The invention discloses a radio resource synchronization method and device based on networking in order to resolve the problem in the prior art that radio resource synchronization accuracy among base stations is low. The radio resource synchronization method includes the steps that when each synchronization period arrives, a base station in networking determines the self synchronization time migration amount according to the self synchronization level; a self interception sub-frame and a self synchronization sub-frame are determined according to the self synchronization time migration amount; the synchronization signal of a target base station is obtained through the self interception sub-frame, a standard base station of the base station is determined from the target base station based on the synchronization signal, and radio resource synchronization with the standard base station is built based on the synchronization signal of the standard base station. The information source of a high synchronization level can be searched for automatically, the synchronization level of the base stations is changed in real time, the synchronization accuracy of the base stations is improved, the optimal synchronization level of all the base station is realized, the step-out phenomenon of the whole network caused by anomaly of a certain base station is avoided, and therefore the synchronization self-healing capacity of the whole network is improved.

Description

A kind of air interface synchronization method based on networking and device

Technical field

The present invention relates to moving communicating field, particularly relate to a kind of air interface synchronization method based on networking and device.

Background technology

Along with the fast development of mobile Internet, various application emerges in an endless stream, and to the capacity of mobile network, the requirement of handling up is more and more higher.The 4G network of current commercialization is often operated in high band, compares with original 2G, 3G frequency range, and signal attenuation is faster, and poorer to the penetration performance of building, rely on outdoor grand net to carry out in-door covering, effect is often not good.Form a complete network using micro-base station (FemtoCell) as elementary cell and become a ripe solution gradually.

If but cannot reliable synchronization be kept between each FemtoCell, then mutual interference can be very serious, causes very adverse influence to the capacity of whole system and Consumer's Experience.

For the problems referred to above, prior art proposes air interface synchronization technology, namely need to carry out synchronous base station and obtain synchronizing information by intercepting the synchronizing signal completing synchronous base station transmission, and the internal clocking of self is adjusted according to the synchronizing information obtained, so just can be synchronized with and above-mentionedly complete synchronous base station, now above-mentioned to have completed synchronous base station be the Reference BTS that need carry out synchronous base station.

But the synchronous method of traditional multihop determines the synchronization level of each base station in base station initiated process, if there is step-out in the base station of middle one-level, then the base station of next stage cannot keep synchronous regime, or must reaffirm synchronization level interrupting service a period of time and obtain synchronous.

In addition, traditional multihop synchronous method when high-grade synchronous information source occurs cannot adaptive synchronicity to high-grade information source, or need switch or need interrupting service, just can be synchronized to high-grade wish, synchronization accuracy is poor, poor user experience.

Summary of the invention

The object of this invention is to provide a kind of air interface synchronization method based on networking and device, to solve the lower problem of air interface synchronization precision in prior art between base station.

The object of the invention is to be achieved through the following technical solutions:

Based on an air interface synchronization method for networking, comprising:

When arriving each synchronizing cycle, side-play amount lock in time of self, according to the synchronization level of self, is determined in the base station in networking;

A described base station is according to side-play amount lock in time of self, and that determines self intercepts subframe and synchronous subframe;

A described base station is by the synchronizing signal intercepting subframe acquisition target BS of self, from described target BS, the Reference BTS of a described base station is determined based on described synchronizing signal, and set up air interface synchronization based on the synchronizing signal of described Reference BTS and described Reference BTS, wherein said synchronizing signal is that described target BS is sent by the synchronous subframe of self, and described target BS is the base station higher than the synchronization level of a described base station.

Like this, whole network can be made to complete automatic network-building, and in networking the information source of automatic search high synchronization level, the synchronization level of real-time change base station, in i.e. networking process, the clock grade of a certain base station changes, also can this change of self adaptation again, not needing to interrupt regular traffic just can make each base station find oneself synchronization level applicable, complete the synchronous of whole network, make the synchronization level that each base station reaches optimum, avoid respective base stations to occur extremely causing whole network step-out, thus improve the synchronous self-healing ability of whole network.

Optionally, comprise further:

In the pre-configured stage, a described base station carries out that global position system GPS is synchronous, IEEE 1588 synchronous and air interface synchronization successively;

If a described base station is synchronous by GPS or IEEE 1588 mode completion timing, then the synchronization level of a described base station is secondary high-grade.Wherein, the synchronization level of macro base station is highest ranking;

If a described base station is synchronous by air interface synchronization mode completion timing, then according to the synchronization level of the Reference BTS of a described base station, determine the synchronization level of a described base station, wherein, the synchronization level of macro base station is highest ranking, if described Reference BTS is macro base station, then the synchronization level of a described base station is secondary high-grade, if described Reference BTS is non-macro base station, then the synchronization level of a described base station grade lower than the synchronization level of described Reference BTS;

If a described base station cannot complete synchronously, then determine that a described base station is isolated island base station, the synchronization level of described isolated island base station is the lowest class.

Optionally, a described base station, according to the synchronization level of self, is determined side-play amount lock in time of self, being comprised:

A described base station utilize systemic presupposition synchronization level and lock in time side-play amount mapping relations according to the synchronization level of self, determine side-play amount lock in time of self.

Optionally, a described base station is according to side-play amount lock in time of self, and that determines self intercepts subframe and synchronous subframe, comprising:

A described base station utilize systemic presupposition lock in time side-play amount with intercept the lock in time side-play amount of mapping relations according to self of radio frames, that determines self intercepts radio frames, the subframe 1 intercepting radio frames of self is set to the synchronous subframe of self, wherein, data service scheduling is not carried out in the synchronous subframe of self in a described base station, non-isolated island base station sends the auxiliary synchronous signals SSS of subframe 0 at the 3rd symbol of synchronous subframe and skips the Resource Block RB that master sync signal PSS takies, isolated island base station sends the auxiliary synchronous signals SSS of son 5 at the 3rd symbol of synchronous subframe and skips the Resource Block RB that master sync signal PSS takies,

What the synchronous subframe of the target BS higher than self synchronization level was set to self by a described base station intercepts subframe.

Optionally, a described base station, by the synchronizing signal intercepting subframe acquisition target BS of self, comprising:

A described base station is not by sending intercepting in subframe of self synchronizing signal that downstream signal obtains target BS, the synchronizing signal of described target BS comprises master sync signal PSS and auxiliary synchronous signals SSS, and the synchronizing signal of described target BS is that target BS is sent by the synchronous subframe of self.

Optionally, a described base station is by the synchronizing signal intercepting subframe acquisition target BS of self, from described target BS, determine the Reference BTS of a described base station based on described synchronizing signal, and set up air interface synchronization based on the synchronizing signal of described Reference BTS and described Reference BTS, comprising:

A described base station, by the synchronizing signal intercepting subframe acquisition target BS of self, based on the synchronizing signal obtained, is determined the reference signal quality that target BS is corresponding to obtain the reference signal quality of all target BS;

A described base station, based on the reference signal quality of all target BS, selects a target BS as the Reference BTS of a described base station from all target BS;

A described base station obtains the synchronizing signal of described Reference BTS, sets up air interface synchronization based on described synchronizing signal and described Reference BTS.

Optionally, a described base station, based on the reference signal quality of all target BS, is selected a target BS as the Reference BTS of a described base station, is specifically comprised from all target BS:

If detect in the described base station continuous N synchronizing cycle reference signal quality of a target BS be greater than default threshold value and the synchronization level of a described target BS two grade at least higher than the synchronization level of a described base station time, using the Reference BTS of a described target BS as a described base station; Otherwise, from all target BS, select the target BS of a grade higher than the synchronization level of a described base station as Reference BTS.

Optionally, a described base station obtains the synchronizing signal of described Reference BTS, after setting up air interface synchronization, comprises further based on described synchronizing signal and described Reference BTS:

A described base station obtains the synchronization level of described Reference BTS, if during the synchronization level of a described Reference BTS grade higher than the synchronization level of a described base station, then keep the synchronization level of a described base station constant; If the synchronization level of described Reference BTS than a described base station synchronization level at least tall person's two-stage time, then the synchronization level of a described base station is adjusted to one-level lower than the synchronization level of described Reference BTS.

If a described base station can not detect the Reference BTS of a described base station in a continuous N synchronizing cycle, then when arriving next synchronizing cycle, synchronizing signal is intercepted in the synchronous subframe of the base station of each synchronization level in a described base station, judges whether the synchronizing signal that can get at least one base station in a continuous N synchronizing cycle;

If a described base station cannot get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, then a described base station sends the auxiliary synchronous signals of subframe 5 in the synchronous subframe of self, determine that the synchronization level adjusting self is the lowest class certainly as isolated island base station;

If a described base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, from the base station that described at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization as Reference BTS, the synchronization level adjusting self is a grade lower than the synchronization level of described Reference BTS.

Optionally, if a described base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, from the base station that described at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization, comprising:

If a described base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, the reference signal quality filtering out isolated island base station from all reference signal quality obtains remaining reference signal quality, at least one reference signal quality that reference signal quality is greater than predetermined threshold value is filtered out from remaining reference signal quality, from the base station that described at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization as Reference BTS.

Based on an air interface synchronization device for networking, be positioned at base station side, comprise:

First determining unit, for when arriving each synchronizing cycle, according to the synchronization level of this base station, determines side-play amount lock in time of this base station;

Second determining unit, for side-play amount lock in time according to this base station, that determines this base station intercepts subframe and synchronous subframe;

Lock unit, for the synchronizing signal intercepting subframe acquisition target BS by this base station, from described target BS, the Reference BTS of this base station is determined based on described synchronizing signal, and set up air interface synchronization based on the synchronizing signal of described Reference BTS and described Reference BTS, wherein said synchronizing signal is that described target BS is sent by the synchronous subframe of self, and described target BS is the base station higher than the synchronization level of this base station.

Optionally, described lock unit is further used for:

In the pre-configured stage, carry out that global position system GPS is synchronous, IEEE 1588 synchronous and air interface synchronization successively;

If this base station is synchronous by GPS or IEEE 1588 mode completion timing, then determine that the synchronization level of this base station is for secondary high-grade.Wherein, the synchronization level of macro base station is highest ranking;

If this base station is synchronous by air interface synchronization mode completion timing, then according to the synchronization level of the Reference BTS of this base station, determine the synchronization level of this base station, wherein, the synchronization level of macro base station is highest ranking, if described Reference BTS is macro base station, then the synchronization level of this base station is secondary high-grade, if described Reference BTS is non-macro base station, then the synchronization level of this base station grade lower than the synchronization level of described Reference BTS;

If this base station cannot complete synchronously, then determine that this base station is isolated island base station, the synchronization level of described isolated island base station is the lowest class.

Optionally, according to the synchronization level of this base station, when determining side-play amount lock in time of this base station, described first determining unit specifically for:

Utilize systemic presupposition synchronization level and lock in time side-play amount mapping relations according to the synchronization level of this base station, determine side-play amount lock in time of this base station.

Optionally, according to side-play amount lock in time of this base station, determine this base station intercept subframe and synchronous subframe time, described second determining unit specifically for:

Utilize systemic presupposition lock in time side-play amount with intercept the lock in time side-play amount of mapping relations according to this base station of radio frames, that determines this base station intercepts radio frames, the subframe 1 intercepting radio frames of this base station is set to the synchronous subframe of this base station, wherein, data service scheduling is not carried out in the synchronous subframe of self in any base station, non-isolated island base station sends the auxiliary synchronous signals SSS of subframe 0 at the 3rd symbol of synchronous subframe and skips the Resource Block RB that master sync signal PSS takies, isolated island base station sends the auxiliary synchronous signals SSS of son 5 at the 3rd symbol of synchronous subframe and skips the Resource Block RB that master sync signal PSS takies,

What the synchronous subframe of the target BS higher than this base station synchronization grade is set to this base station intercepts subframe.

Optionally, by this base station intercept subframe obtain the synchronizing signal of target BS time, described lock unit specifically for:

By not sending intercepting in subframe of this base station the synchronizing signal that downstream signal obtains target BS, the synchronizing signal of described target BS comprises master sync signal PSS and auxiliary synchronous signals SSS, and the synchronizing signal of described target BS is that target BS is sent by the synchronous subframe of self.

Optionally, by the synchronizing signal intercepting subframe acquisition target BS of this base station, from described target BS, the Reference BTS of this base station is determined based on described synchronizing signal, and when setting up air interface synchronization based on the synchronizing signal of described Reference BTS and described Reference BTS, described lock unit specifically for:

By the synchronizing signal intercepting subframe acquisition target BS of this base station, based on the synchronizing signal obtained, determine the reference signal quality that target BS is corresponding to obtain the reference signal quality of all target BS;

Based on the reference signal quality of all target BS, from all target BS, select a target BS as the Reference BTS of this base station;

Obtain the synchronizing signal of described Reference BTS, set up air interface synchronization based on described synchronizing signal and described Reference BTS.

Optionally, based on the reference signal quality of all target BS, when selecting the Reference BTS of a target BS as this base station from all target BS, described lock unit specifically for:

If this base station continuous N detect in the synchronizing cycle reference signal quality of a target BS be greater than default threshold value and the synchronization level of this base station of synchronization level of a described target BS at least high two grades time, using the Reference BTS of a described target BS as this base station; Otherwise, from all target BS, select the target BS of a grade higher than the synchronization level of this base station as Reference BTS.

Optionally, obtain the synchronizing signal of described Reference BTS, after setting up air interface synchronization based on described synchronizing signal and described Reference BTS, described lock unit is further used for:

Obtain the synchronization level of described Reference BTS, if during the synchronization level of a described Reference BTS grade higher than the synchronization level of this base station, then keep the synchronization level of this base station constant; If the synchronization level of described Reference BTS than this base station synchronization level at least tall person's two-stage time, then the synchronization level of this base station is adjusted to one-level lower than the synchronization level of described Reference BTS.

If this base station can not detect the Reference BTS of this base station in a continuous N synchronizing cycle, then when arriving next synchronizing cycle, intercept synchronizing signal in the synchronous subframe of the base station of each synchronization level, judge whether the synchronizing signal that can get at least one base station in a continuous N synchronizing cycle;

If this base station cannot get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, then send the auxiliary synchronous signals of subframe 5 in the synchronous subframe of this base station, determine that this base station is isolated island base station, the synchronization level adjusting this base station is the lowest class;

If this base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, from the base station that described at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization as Reference BTS, the synchronization level adjusting this base station is a grade lower than the synchronization level of described Reference BTS.

Optionally, if this base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, when selecting the highest base station of a synchronization level to carry out air interface synchronization from the base station that described at least one reference signal quality is corresponding, described lock unit specifically for:

If this base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, the reference signal quality filtering out isolated island base station from all reference signal quality obtains remaining reference signal quality, at least one reference signal quality that reference signal quality is greater than predetermined threshold value is filtered out from remaining reference signal quality, from the base station that described at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization as Reference BTS.

Accompanying drawing explanation

Fig. 1 is the air interface synchronization method schematic flow sheet based on networking in inventive embodiments;

Fig. 2 is the synchronous network schematic diagram of base station in the embodiment of the present invention;

Fig. 3 is the frame format schematic diagram of LTE TDD system;

Fig. 4 is the air interface synchronization apparatus structure schematic diagram based on networking in inventive embodiments.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, is not whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

A kind of air interface synchronization method based on networking is provided in the embodiment of the present invention.For under network environment, problem is interfered with each other between base station, affect the synchronous accuracy of FemtoCell, the method that multi-hop is synchronous is adopted in the embodiment of the present invention, each base station, the agreement moment issues synchronizing signal and synchronization level information in advance, completes the renewal of synchronization level, keeps synchronous regime, the precision of further raising base station synchronization, improves the throughput of many base station networkings.

Consult shown in Fig. 1, provide a kind of air interface synchronization method based on networking in the embodiment of the present invention, idiographic flow is as follows:

In the pre-configured stage, any base station of networking carries out that global positioning system (GlobalPositioning System, GPS) is synchronous, 1588 synchronous and air interface synchronization successively; If GPS is passed through in this base station or 1588 mode completion timings are synchronous, then the synchronization level of this base station is secondary high-grade.Wherein, the synchronization level of macro base station is highest ranking; If this base station is synchronous by air interface synchronization mode completion timing, then according to the synchronization level of the Reference BTS of this base station, determine the synchronization level of this base station, wherein, the synchronization level of macro base station is highest ranking, if this Reference BTS is macro base station, then the synchronization level of this base station is secondary high-grade, if this Reference BTS is non-macro base station, then the synchronization level of this base station grade lower than the synchronization level of this Reference BTS; If this base station cannot complete synchronously, then determine that this base station is isolated island base station, the synchronization level of this isolated island base station is the lowest class." 1588 " in the application refer to IEEE1588, and 1588 is synchronous namely according to the base station synchronization that the precise clock synchronization consensus standard of network measure and control system carries out.

Such as, after the base station in networking powers on, carry out GPS successively, 1588, air interface synchronization.If certain base station A is with GPS, 1588 is synchronous, then A synchronization level in base station is 0; If certain base station B and other base station synchronization, then according to self synchronization level of the other side's hierarchical selection, if synchronous base station is macro base station, then the synchronization level of base station B is 0; If synchronous base station grade is 0, then the synchronization level of base station B is 1; The non-isolated island base station of prioritizing selection is carried out synchronously, and the synchronization level that wherein can arrange macro base station is that highest ranking represents with-1, and synchronization level 0 is secondary high-grade, arranges the number of synchronization level according to network environment flexibly.

Step 100: when arriving each synchronizing cycle, side-play amount lock in time of self, according to the synchronization level of self, is determined in the base station in networking.

Concrete, the base station in networking utilize systemic presupposition synchronization level and lock in time side-play amount mapping relations according to the synchronization level of self, determine side-play amount lock in time of self.

Such as, to arrange synchronizing cycle be T, T can be long-time arbitrarily, and unit is radio frames, and length is the multiple of radio frames.For Long Term Evolution (Long Term Evolution, LTE) system, radio frames length is 10ms, radio frame number (System Frame Number, SFN) scope 0 ~ 1023. arranges and offsets T_offset lock in time, according to the difference of synchronization level, arrange different T_offset, unit is radio frames.Illustrate, consult shown in Fig. 2, arranging T is 1024 SFN, i.e. T=10240ms, macro base station in networking does not need to intercept other base station, synchronization level is the base station of 0, only need to intercept macro base station, T_offset=1, then every 1024 SFN, carry out intercepting synchronously in the radio frames of SFN=0, synchronization level is the base station of 1, T_offset=2, every 1024 SFN, carry out intercepting synchronously in the radio frames of SFN=1, synchronization level is the base station of 2, T_offset=3, every 1024 SFN, carry out intercepting synchronously in the radio frames of SFN=2, by that analogy.Side-play amount lock in time of self, according to the synchronization level of self, is determined in a base station in networking.

Step 101: an above-mentioned base station is according to side-play amount lock in time of self, and that determines self intercepts subframe and synchronous subframe.

Concrete, one base station is according to side-play amount lock in time of self, that determines self intercepts subframe and synchronous subframe, detailed process is: this base station utilize systemic presupposition lock in time side-play amount with intercept the lock in time side-play amount of mapping relations according to self of radio frames, that determines self intercepts radio frames, the subframe 1 intercepting radio frames of self is set to the synchronous subframe of self, wherein, data service scheduling is not carried out in the synchronous subframe of self in this base station, non-isolated island base station sends auxiliary synchronous signals (the Secondary Synchronized Signal of subframe 0 at the 3rd symbol of synchronous subframe, and skip master sync signal (PrimarySynchronized Signal SSS), PSS) Resource Block (the Resource Block taken, RB), isolated island base station sends the SSS of subframe 5 at the 3rd symbol of synchronous subframe and skips the RB that PSS takies, what the synchronous subframe of the target BS higher than self synchronization level was set to self by this base station intercepts subframe.

Such as, determine T synchronizing cycle, and after the simultaneous bias T_offset intercepted, the radio frames intercepting moment place just determines.The subframe that further selection is intercepted, intercepts subframe and is set to subframe 1, and according to the frame format of LTE system, for TDD system, frame format is consulted shown in Fig. 3, and subframe 1 is special subframe.The time slot proportion of concrete LTE TDD system, can consult shown in table 1.

Table 1

Concrete, for being listened subframe, such as synchronization level be 1 base station can intercept in the subframe 1 of SFN=1 the base station that synchronization level is 0.Now, be the base station of 0 for synchronization level, the subframe 1 of the radio frames of SFN=1 is and is listened subframe, is also the synchronous subframe of this base station.First, in this subframe, do not carry out data service scheduling (Downlink Share Channel, DL_SCH), only transmit control signal; SSS is sent at the 3rd symbol of this subframe 1 and symbol 2, different according to the PSS of this base station, SSS is mapped to different positions, avoids interference.PSS has (0,1,2) three roots, namely have three kinds of situations.6 RB, SSS fixing in the middle of occupied bandwidth due to PSS also need to take 6 RB.For system more than 5MHz bandwidth, RB number is more than or equal to 25, and according to PSS root sequence value, { 0,1,2}, maps successively in order, maps SSS as root sequence is 0 from the 0th RB, if root sequence is 1, then maps from the 6th RB.The RB that PSS takies is skipped in mapping process; Due to LTE networking employing is mould 3 networking mode, adopts this mapping method to maximize and avoids SSS signal disturbing between adjacent base station, and be the system of 3MHz for bandwidth, then from the 0th RB, all map SSS, skip the RB that PSS takies simultaneously.Here mapping mode is not unique, as long as the Resource Block RB that the RB that SSS can be made to take does not take with PSS conflicts, by the SSS position of synchronous subframe and the mapping of PSS root sequence, greatly can reduce adjacent base station SSS signal disturbing.

Step 102: an above-mentioned base station is by the synchronizing signal intercepting subframe acquisition target BS of self, from this target BS, the Reference BTS of this base station is determined based on this synchronizing signal, and set up air interface synchronization based on the synchronizing signal of this Reference BTS and this Reference BTS, wherein this synchronizing signal is that this target BS is sent by the synchronous subframe of self, and this target BS is the base station higher than the synchronization level of this base station.

Concrete, one base station is not by sending intercepting in subframe of self synchronizing signal that downstream signal obtains target BS, the synchronizing signal of this target BS comprises master sync signal and auxiliary synchronous signals, and the synchronizing signal of this target BS is that target BS is sent by the synchronous subframe of self.

Such as, for intercepting subframe, special subframe 1 is switched to sub-frame of uplink by the base station of low synchronization level, intercepts.For different synchronization level, intercept subframe different according to T_offset difference, in order to avoid the interference of different synchronization level base station, low synchronization level base station all switches in the synchronous subframe of high-grade base station and uply often to open, illustrate, can consult shown in Fig. 2, synchronization level be 3 base station do not send downstream signal in the synchronous subframe that grade is-1,0,1 and 2 base stations, change into and uply often to open.This subframe comprises PSS and SSS simultaneously, therefore can PSS be passed through, SSS obtains cell ID (Cell_ID), simultaneously according to Cell_ID demodulation cell reference signals (cell reference signal, Cell_RS), obtain the quality (Reference Signal Receiving Quality, RSRQ) of cell reference signals.

Like this, be listened base station by sending SSS at PSS place symbol, can make to intercept base station and obtain by intercepting single subframe the Cell_ID that this is listened station, and then obtain reference signal RSRQ by resolving cell reference signals, carry out synchronization level judgement, avoid and intercept the impact of multiple subframe on regular traffic.High synchronization level base station sends SSS in the synchronous subframe of self, does not dispatch DL_SCH simultaneously, only transmits control signal; Low synchronization level base station is carried out synchronously in the synchronous subframe that high synchronization level base station is corresponding, adjustment frequency deviation and time inclined.As Fig. 2, base station C intercepts subframe at second and intercepts base station B, catches up with one-level base station B and carries out synchronously, and base station C intercepts subframe at first and intercepts base station A (macro base station) simultaneously.

Concrete, one base station is by the synchronizing signal intercepting subframe acquisition target BS of self, from this target BS, the Reference BTS of this base station is determined based on this synchronizing signal, and set up air interface synchronization based on the synchronizing signal of this Reference BTS and this Reference BTS, detailed process is: this base station is by the synchronizing signal intercepting subframe acquisition target BS of self, based on the synchronizing signal obtained, determine the reference signal quality that target BS is corresponding to obtain the reference signal quality of all target BS; This base station should, based on the reference signal quality of all target BS, select a target BS as the Reference BTS of this base station from all target BS; This base station obtains the synchronizing signal of Reference BTS, sets up air interface synchronization based on this synchronizing signal and Reference BTS.

Concrete, one base station is based on the reference signal quality of all target BS, from all target BS, select a target BS as the Reference BTS of this base station, detailed process is: if a base station detect in a continuous N synchronizing cycle reference signal quality of a target BS be greater than default threshold value and the synchronization level of this target BS two grade at least higher than the synchronization level of this base station time, using the Reference BTS of this target BS as this base station; Otherwise, from all target BS, select the target BS of a grade higher than the synchronization level of this base station as Reference BTS.

Further, one base station obtains the synchronizing signal of Reference BTS, after setting up air interface synchronization based on this synchronizing signal and this Reference BTS, this base station obtains the synchronization level of this Reference BTS, if during the synchronization level of this Reference BTS grade higher than the synchronization level of this base station, then keep the synchronization level of this base station constant; If the synchronization level of this Reference BTS than this base station synchronization level at least tall person's two-stage time, then the synchronization level of this base station is adjusted to one-level lower than the synchronization level of this Reference BTS.

Such as, when arriving each synchronizing cycle, a certainly intercept base station E and carry out synchronously except catching up with one-level base station (Reference BTS), intercept in the synchronous subframe of higher synchronization level base station simultaneously, according to PSS, SSS determines Cell_ID, and then according to the Cell_RS in first symbol of synchronous subframe, calculate RSRQ_H, judge whether to need to improve synchronization level, setting judges that thresholding is H, if continuous N (M is the positive integer of setting) all detects the RSRQ_H>H of a certain synchronization level base station F in individual synchronizing cycle, and the synchronization level of this base station F two-stage at least higher than the synchronization level of base station E, now, base station E using base station F as Reference BTS, base station E and base station F carries out air interface synchronization, and improve the synchronization level of base station E, the synchronization level of base station E is revised as a grade lower than the synchronization level of base station F.

Further, one base station obtains the synchronizing signal of this Reference BTS, after setting up air interface synchronization based on this synchronizing signal and this Reference BTS, if this base station can not detect the Reference BTS of this base station in a continuous N synchronizing cycle, then when arriving next synchronizing cycle, synchronizing signal is intercepted in the synchronous subframe of the base station of each synchronization level in this base station, judges whether the synchronizing signal that can get at least one base station in a continuous N synchronizing cycle, comprises two kinds of situations:

The first situation is: this base station cannot get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, then this base station sends the auxiliary synchronous signals of subframe 5 in the synchronous subframe of self, determine that the synchronization level adjusting self is the lowest class certainly as isolated island base station.

Second case is: this base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, from the base station that this at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization as Reference BTS, the synchronization level adjusting self is a grade lower than the synchronization level of this Reference BTS.

Concrete, if a base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, from the base station that this at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization, detailed process is: if this base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, the reference signal quality filtering out isolated island base station from all reference signal quality obtains remaining reference signal quality, at least one reference signal quality that reference signal quality is greater than predetermined threshold value is filtered out from remaining reference signal quality, from the base station that this at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization as Reference BTS.

Such as, a certain base station D finds that oneself synchronous Reference BTS lost, namely base station D cannot detect the Reference BTS of this base station in a continuous N synchronizing cycle, then base station D attempts intercepting in the synchronous subframe of each synchronization level, if continuous N time is all intercepted less than other base station, then state that this base station is isolated island base station, the SSS signal of subframe 5 is sent at the 3rd symbol of synchronous subframe, if continuous N time can both listen to other base station, then from the base station that can listen to, first isolated island base station is excluded, secondly each base station when signal quality meets to a certain degree, the base station that prioritizing selection synchronization level is high is carried out synchronously, thus ensure the reliability of synchronous clock source.

Based on technique scheme, consult shown in Fig. 4, a kind of air interface synchronization device based on networking is provided in the embodiment of the present invention, is positioned at base station side, comprises: the first determining unit 40, second determining unit 41 and lock unit 42, wherein:

First determining unit 40, for when arriving each synchronizing cycle, according to the synchronization level of this base station, determines side-play amount lock in time of this base station;

Second determining unit 41, for side-play amount lock in time according to this base station, that determines this base station intercepts subframe and synchronous subframe;

Lock unit 42, for the synchronizing signal intercepting subframe acquisition target BS by this base station, from this target BS, the Reference BTS of this base station is determined based on this synchronizing signal, and set up air interface synchronization based on the synchronizing signal of this Reference BTS and this Reference BTS, wherein this synchronizing signal is that this target BS is sent by the synchronous subframe of self, and this target BS is the base station higher than the synchronization level of this base station.

Optionally, lock unit 42 is further used for:

If this base station is synchronous by air interface synchronization mode completion timing, then according to the synchronization level of the Reference BTS of this base station, determine the synchronization level of this base station, wherein, the synchronization level of macro base station is highest ranking, if this Reference BTS is macro base station, then the synchronization level of this base station is secondary high-grade, if this Reference BTS is non-macro base station, then the synchronization level of this base station grade lower than the synchronization level of this Reference BTS;

If this base station cannot complete synchronously, then determine that this base station is isolated island base station, the synchronization level of this isolated island base station is the lowest class.

Optionally, according to the synchronization level of this base station, when determining side-play amount lock in time of this base station, the first determining unit 40 specifically for:

Optionally, according to side-play amount lock in time of this base station, determine this base station intercept subframe and synchronous subframe time, the second determining unit 41 specifically for:

Optionally, by this base station intercept subframe obtain the synchronizing signal of target BS time, lock unit 42 specifically for:

By not sending intercepting in subframe of this base station the synchronizing signal that downstream signal obtains target BS, the synchronizing signal of this target BS comprises master sync signal PSS and auxiliary synchronous signals SSS, and the synchronizing signal of this target BS is that target BS is sent by the synchronous subframe of self.

Optionally, by the synchronizing signal intercepting subframe acquisition target BS of this base station, from this target BS, determine the Reference BTS of this base station based on this synchronizing signal, and when setting up air interface synchronization based on the synchronizing signal of this Reference BTS and this Reference BTS, lock unit 42 specifically for:

Obtain the synchronizing signal of this Reference BTS, set up air interface synchronization based on this synchronizing signal and this Reference BTS.

Optionally, based on the reference signal quality of all target BS, when selecting the Reference BTS of a target BS as this base station from all target BS, lock unit 42 specifically for:

If this base station continuous N detect in the synchronizing cycle reference signal quality of a target BS be greater than default threshold value and the synchronization level of this base station of synchronization level of this target BS at least high two grades time, using the Reference BTS of this target BS as this base station; Otherwise, from all target BS, select the target BS of a grade higher than the synchronization level of this base station as Reference BTS.

Optionally, obtain the synchronizing signal of this Reference BTS, after setting up air interface synchronization based on this synchronizing signal and this Reference BTS, lock unit 42 is further used for:

Obtain the synchronization level of this Reference BTS, if during the synchronization level of this Reference BTS grade higher than the synchronization level of this base station, then keep the synchronization level of this base station constant; If the synchronization level of this Reference BTS than this base station synchronization level at least tall person's two-stage time, then the synchronization level of this base station is adjusted to one-level lower than the synchronization level of this Reference BTS.

If this base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, from the base station that this at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization as Reference BTS, the synchronization level adjusting this base station is a grade lower than the synchronization level of this Reference BTS.

Optionally, if this base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, when selecting the highest base station of a synchronization level to carry out air interface synchronization from the base station that this at least one reference signal quality is corresponding, lock unit 42 specifically for:

If this base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, the reference signal quality filtering out isolated island base station from all reference signal quality obtains remaining reference signal quality, at least one reference signal quality that reference signal quality is greater than predetermined threshold value is filtered out from remaining reference signal quality, from the base station that this at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization as Reference BTS.

In sum, in the embodiment of the present invention, when arriving each synchronizing cycle, side-play amount lock in time of self, according to the synchronization level of self, is determined in the base station in networking, this base station is according to side-play amount lock in time of self, and that determines self intercepts subframe and synchronous subframe, this base station is by the synchronizing signal intercepting subframe acquisition target BS of self, from target BS, the Reference BTS of this base station is determined based on this synchronizing signal, and set up air interface synchronization based on the synchronizing signal of this Reference BTS and this Reference BTS, like this, whole network can be made to complete automatic network-building, and in networking the information source of automatic search high synchronization level, the synchronization level of real-time change base station, in i.e. networking process, the clock grade of a certain base station changes, also can this change of self adaptation again, not needing to interrupt regular traffic just can make each base station find oneself synchronization level applicable, complete the synchronous of whole network, make the synchronization level that each base station reaches optimum, respective base stations is avoided to occur extremely causing whole network step-out, thus improve the synchronous self-healing ability of whole network.

Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) of computer usable program code.

The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, equipment (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.

Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.

Obviously, those skilled in the art can carry out various change and modification to the embodiment of the present invention and not depart from the spirit and scope of the embodiment of the present invention.Like this, if these amendments of the embodiment of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims

1. based on an air interface synchronization method for networking, it is characterized in that, comprising:

2. the method for claim 1, is characterized in that, comprises further:

3. the method for claim 1, is characterized in that, a described base station, according to the synchronization level of self, is determined side-play amount lock in time of self, being comprised:

4. the method for claim 1, is characterized in that, a described base station is according to side-play amount lock in time of self, and that determines self intercepts subframe and synchronous subframe, comprising:

5. the method for claim 1, is characterized in that, a described base station, by the synchronizing signal intercepting subframe acquisition target BS of self, comprising:

6. the method as described in any one of claim 1-5, it is characterized in that, a described base station is by the synchronizing signal intercepting subframe acquisition target BS of self, from described target BS, the Reference BTS of a described base station is determined based on described synchronizing signal, and set up air interface synchronization based on the synchronizing signal of described Reference BTS and described Reference BTS, comprising:

7. method as claimed in claim 6, it is characterized in that, a described base station, based on the reference signal quality of all target BS, is selected a target BS as the Reference BTS of a described base station, is specifically comprised from all target BS:

8. method as claimed in claim 6, it is characterized in that, a described base station obtains the synchronizing signal of described Reference BTS, after setting up air interface synchronization, comprises further based on described synchronizing signal and described Reference BTS:

9. method as claimed in claim 6, it is characterized in that, a described base station obtains the synchronizing signal of described Reference BTS, after setting up air interface synchronization, comprises further based on described synchronizing signal and described Reference BTS:

10. method as claimed in claim 9, it is characterized in that, if a described base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, from the base station that described at least one reference signal quality is corresponding, select the highest base station of a synchronization level to carry out air interface synchronization, comprising:

11. 1 kinds, based on the air interface synchronization device of networking, are positioned at base station side, it is characterized in that, comprising:

12. devices as claimed in claim 11, it is characterized in that, described lock unit is further used for:

13. devices as claimed in claim 11, is characterized in that, according to the synchronization level of this base station, when determining side-play amount lock in time of this base station, described first determining unit specifically for:

14. devices as claimed in claim 11, is characterized in that, according to side-play amount lock in time of this base station, determine this base station intercept subframe and synchronous subframe time, described second determining unit specifically for:

15. devices as claimed in claim 11, is characterized in that, by this base station intercept subframe obtain the synchronizing signal of target BS time, described lock unit specifically for:

16. devices as described in any one of claim 11-15, it is characterized in that, by the synchronizing signal intercepting subframe acquisition target BS of this base station, from described target BS, the Reference BTS of this base station is determined based on described synchronizing signal, and when setting up air interface synchronization based on the synchronizing signal of described Reference BTS and described Reference BTS, described lock unit specifically for:

17. devices as claimed in claim 16, is characterized in that, based on the reference signal quality of all target BS, when selecting the Reference BTS of a target BS as this base station from all target BS, described lock unit specifically for:

18. devices as claimed in claim 16, is characterized in that, obtain the synchronizing signal of described Reference BTS, and after setting up air interface synchronization based on described synchronizing signal and described Reference BTS, described lock unit is further used for:

19. devices as claimed in claim 16, is characterized in that, obtain the synchronizing signal of described Reference BTS, and after setting up air interface synchronization based on described synchronizing signal and described Reference BTS, described lock unit is further used for:

20. devices as claimed in claim 19, it is characterized in that, if this base station can get the synchronizing signal of at least one base station in a continuous N synchronizing cycle, based on the synchronizing signal of at least one base station got, determine the reference signal quality that at least one base station is corresponding, obtain all reference signal quality, filter out from all reference signal quality and meet pre-conditioned at least one reference signal quality, when selecting the highest base station of a synchronization level to carry out air interface synchronization from the base station that described at least one reference signal quality is corresponding, described lock unit specifically for: