CN100518019C

CN100518019C - Space interface synchronous method

Info

Publication number: CN100518019C
Application number: CNB200510085534XA
Authority: CN
Inventors: 刁心玺
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2005-07-26
Filing date: 2005-07-26
Publication date: 2009-07-22
Anticipated expiration: 2025-07-26
Also published as: CN1905405A

Abstract

The invention discloses an air interface synchronizing method, using intercommunication ability between base stations to make synchronous measurement. For layered wireless access network, it firstly performs in-layer synchronization and then performs interlayer synchronization, where in-layer synchronization performs time synchronization on the opening face of emission antenna by geographical coordinates of each base station and measurement of relative time difference on the air interface and the interlayer synchronization is performed according to the information sent by upper base station. And it is applied to layered TDD system, single-layer wireless network structure and FDD system, and time division and frequency division mixed system.

Description

A kind of space connector synchronization method

Technical field

The present invention relates to wireless communication field, relate in particular to interior, the interlayer method for synchronous of layer of the integrated wireless access network that wireless digital broadcasting, mobile communication, mobile position estimation business comprehensively are provided.

Background technology

Air interface synchronously to guarantee network stabilization, efficiently work significant, such as, 1) in TDD system, in order to realize the single frequency network under the tdd mode, need the strict synchronism between each transmitting base station, even if the multifrequency networking under the tdd mode in order to reduce the extraradial influence of transmitter strap, also needs the strict synchronism between transmitter; 2) in FDD system, can simplified system measure (as reducing the Cell searching time, simplifying TDOA measurement etc.) synchronously for the emission between the good base station of fdd mode; 3) under TDD and FDD mixed mode, the precise synchronization between each base station is the basis of TDD and FDD hybrid system operate as normal.

Wireless digital broadcasting (DVB, DAB) professional and wireless telecommunications (honeycomb and non-honeycomb) business, mobile Internet (INTERNET) fusion professional, that mobile position estimation is professional cause wireless network that corresponding change all takes place from the function to the structure, as the combination utilization of the introducing of hierarchy and network (MESH), time division duplex (TDD) and Frequency Division Duplexing (FDD) etc., these changes were both had higher requirement to wireless network air interface simultaneous techniques, had also created condition for the synchronous realization of air interface.But, present technology had not both utilized network to be evolved to the advantage that synchronous realization brings, also can't satisfy the new demand of network evolution: the simultaneous techniques of GPS that in cellular mobile communication and digit broadcasting system, uses or ground synchronous network to synchronous proposition, just realized transmission code stream before being sent to the radio-frequency channel synchronously, can't realize between the base station transmit the antenna actinal surface synchronously.Because the influence of feeder and radio-frequency channel has only the efficiency of transmission that just can further improve communication system synchronously that keeps transmitting on the antenna actinal surface.

Summary of the invention

The present invention is according to the shortcoming of existing simultaneous techniques synchronization accuracy difference, the new demand that the evolution of combining wireless network proposes synchronously to air interface, with the new network structure, as hierarchy and network (MESH) is the basis, provide a kind of comprehensive realization interlayer synchronously and the inter-sync space connector synchronization method of layer, make it to have the synchronization accuracy height (being synchronized to the antenna actinal surface) and the characteristics that are easy to realize.

A kind of space connector synchronization method that the present invention provides utilizes the mutual communication capacity that realizes by air interface between each base station to carry out synchro measure.For the layering wireless access network, at first realize layer inter-sync, realize that then interlayer is synchronous.Layer inter-sync by the geographical position coordinates of each base station (layer in base station or interlayer base station) and aloft the relative time poor (RTD) on the interface measure the time synchronized that realizes on the transmitting antenna actinal surface, interlayer is synchronously according to the information realization of base station, upper strata transmission.

Described method comprises realization layer inter-sync successively and realizes that interlayer is synchronous; The inter-sync of described layer may further comprise the steps: 1), when receiving the synchronizing signal that GPS or ground network send here, and with each base station synchronization ground of one deck baseband signal being sent to the radio-frequency channel; 2), carry out the relative time difference measurements with each base station of one deck; 3), according to the relative time level difference measurements, adjust the base station baseband signal be sent to time of radio-frequency channel, to eliminate the influence of radio-frequency channel time delay error, realize in each layer between each base station on the antenna actinal surface synchronously; 1), receive the synchronizing information of upper strata emission described interlayer may further comprise the steps synchronously:; 2), adjust mode of operation; 3), adjust synchronous regime.

Method for synchronous of the present invention both had been applicable to the aerial synchronous realization of interface in layering time division duplex (TDD) system, also was applicable to the precise synchronization of aerial interface in individual layer wireless network structure and Frequency Division Duplexing (FDD) (FDD) system, time-division and the frequency division hybrid system.

Description of drawings

Fig. 1 is the schematic diagram of the network configuration of a kind of comprehensive realization digital broadcasting, mobile communication, mobile position estimation;

Fig. 2 is the flow chart of space connector synchronization method of the present invention.

Embodiment

Present embodiment describes in conjunction with the implementation method of base station synchronization in 101 pairs of air interfaces of the edge net among Fig. 1.

With reference to Fig. 2, space connector synchronization method of the present invention comprises: layer inter-sync 801 and interlayer synchronous 802.In the system that Fig. 1 provides, layer inter-sync is meant synchronous between synchronous, secondary base station and the secondary base station between dominant base and the dominant base; Interlayer is meant synchronously that under the inter-sync prerequisite of layer secondary base station is according to mode of operation and the working time slot and the dominant base collaborative work of dominant base broadcasting.

Layer inter-sync 801 comprises thick synchronous 803 and 804 two basic steps of precise synchronization.Thick synchronous 803 are meant the synchronizing signal sent here at GPS or ground network synchronously down, with synchronously baseband signal being sent to the radio-frequency channel in each base station (dominant base or secondary base station) of one deck; Precise synchronization 804 is meant that carrying out relative time poor (RTD) with each base station of layer measures, and according to the RTD measurement result, adjust the base station baseband signal be sent to time of radio-frequency channel, to eliminate the influence of radio-frequency channel time delay error, realize in the layer between each base station on the antenna actinal surface synchronously.

Precise synchronization 804 comprise relative time poor (RTD) measure 805 and the relative time difference adjust 806 two basic steps.For dominant base, its relative time difference measurements 805 can be realized by the secondary base station of its covering, also can as supporting the ability of MESH, realize that RTD measures by the communication capacity of dominant base self; For secondary base station, can realize the measurement of the relative time difference between the secondary base station by the MESH function of himself, also can under the cooperation of dominant base, finish the measurement of the relative time difference of secondary base station.806 of relative time difference adjustment are that the measurement result according to relative time difference measurements 805 realizes adjusting, if measurement result is that relative time difference between certain two dominant base (or secondary base station) is greater than predetermined threshold, just adjust, method of adjustment is to increase or reduce the time delay that baseband signal is sent to the radio-frequency channel in one of them base station.

Interlayer synchronous 802 comprises synchronizing information 807 (promptly receiving synchronous and control information 115 among Fig. 1), mode of operation adjustment 808, synchronous regime adjustment 809 these three basic steps that receive the upper strata emission.

Step 807 is from synchronously and extract following information the control information 115: discern specific dominant base when the 1) code of dominant base, this code can be used for measuring RTD between the different dominant bases; 2) distribute to the length of working time slot of different layers and putting in order of these time slots, time slot position and the slot length that oneself is worked determined in each secondary base station that this information can be used in the regional cover layer 114, during this information of same by wireless router or gateway 122, digital broadcasting transmitter 123, move or fixed terminal 124 receptions, be used for determining oneself working time slot and mode of operation, wireless router or gateway 122, digital broadcasting transmitter 123, move or fixed terminal 124 can be in specific time slot and other network, establish a communications link as the WLAN (wireless local area network) among Fig. 1 126.When the spectrum allocation may between wide area cover layer 113, the regional cover layer 114 took place to adjust, synchronous and control information 115 also correspondingly changed.

Mode of operation is adjusted the 808 mode of operation information according to step 807 extraction, as slot length and time-slot sequence, adjusts the mode of operation of base station.

Synchronous regime adjusts 809, the synchronizing information that extract according to step 807 base station, and the margin of error between the synchronizing information of launch time that calculation base station is current and upper strata base station broadcast if this margin of error surpasses predetermined thresholding, is just carried out interlayer and is adjusted synchronously.

Claims

1, a kind of space connector synchronization method is characterized in that, described method comprises realization layer inter-sync successively and realizes that interlayer is synchronous; The inter-sync of described layer may further comprise the steps: 1), when receiving the synchronizing signal that GPS or ground network send here, and with each base station synchronization ground of one deck baseband signal being sent to the radio-frequency channel; 2), carry out the relative time difference measurements with each base station of one deck; 3), according to the relative time level difference measurements, adjust the base station baseband signal be sent to time of radio-frequency channel, to eliminate the influence of radio-frequency channel time delay error, realize in each layer between each base station on the antenna actinal surface synchronously; 1), receive the synchronizing information of upper strata emission described interlayer may further comprise the steps synchronously:; 2), adjust mode of operation; 3), adjust synchronous regime; Wherein, the inter-sync of described layer is meant synchronous between synchronous, secondary base station and the secondary base station between dominant base and the dominant base; Described interlayer is meant synchronously that under the inter-sync prerequisite of layer secondary base station is according to mode of operation and the working time slot and the dominant base collaborative work of dominant base broadcasting.

2, space connector synchronization method according to claim 1, it is characterized in that the inter-sync step 2 of described layer) in the relative time difference measurements, for dominant base, its relative time difference measurements is realized by the secondary base station that it covered, or is realized by the communication capacity of dominant base self; For secondary base station, hierarchy and network function that its relative time difference measurements passes through himself realize, or finish under the cooperation of dominant base.

3, space connector synchronization method according to claim 1, it is characterized in that, during the inter-sync step 3) relative time difference of described layer adjusted, when measurement result is that relative time difference between certain two base station is greater than predetermined threshold, just adjust, method of adjustment is to increase or reduce the time delay that baseband signal is sent to the radio-frequency channel in one of them base station.

4, space connector synchronization method according to claim 1 is characterized in that, the synchronizing information that the synchronous step 1) of described interlayer receives the upper strata emission specifically may further comprise the steps: the code that a) extracts dominant base; B) length of different layers working time slot and putting in order of these time slots are distributed in extraction.

According to claim 1 or 4 described space connector synchronization method, it is characterized in that 5, when the spectrum allocation may of interlayer took place to adjust, the synchronizing information of described upper strata emission also correspondingly changed.

6, space connector synchronization method according to claim 1 is characterized in that, the synchronous step 2 of described interlayer) adjust mode of operation and specifically may further comprise the steps: receive mode of operation information, comprise slot length and time-slot sequence; Adjust the mode of operation of base station.

7, space connector synchronization method according to claim 1, it is characterized in that, the synchronous step 3) of described interlayer is adjusted synchronous regime and specifically be may further comprise the steps: the base station is according to the synchronizing information of extracting, the margin of error between the synchronizing information of launch time that calculation base station is current and upper strata base station broadcast, if this margin of error surpasses predetermined thresholding, just carry out interlayer and adjust synchronously.