CN101754351A - Method, system and apparatus for synchronization of home base station - Google Patents
Method, system and apparatus for synchronization of home base station Download PDFInfo
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- CN101754351A CN101754351A CN 200810239045 CN200810239045A CN101754351A CN 101754351 A CN101754351 A CN 101754351A CN 200810239045 CN200810239045 CN 200810239045 CN 200810239045 A CN200810239045 A CN 200810239045A CN 101754351 A CN101754351 A CN 101754351A
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Abstract
The invention discloses a method for the synchronization of home base station, comprising the step that a home base station simulates terminal behaviour in a state of synchronous acquisition to obtain the synchronization with ambient macro base stations; the method specifically comprises the steps: acquiring a downlink synchronization delay time between a macro base station and an HNB; regulating the sending start time from the HNB to an uplink synchronous channel of the macro base station according to the downlink synchronization delay time; receiving a time offset of the uplink synchronous channel sent by the macro base station; and regulating the sending start time from the HNB to a downlink synchronous channel of a user terminal. According to the invention, coarse synchronization is completed through the reception of DwPTS signals by using the HNB, the HNB regulates the sending start time of the uplink synchronous channel according to the downlink synchronization delay time, and the macro base station is indicative of the time offset of the HNB to ultimately ensure precious time synchronous of the HNB and the macro base station, and the DwPTS is transmitted to the user terminal according to the precious synchronization time in order to reduce system interfence.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method for synchronous, system and equipment of Home eNodeB.
Background technology
HNB (Home NodeB, Home eNodeB) be one can expansion, multichannel, the bi-directional communication device between macro base station and user terminal, primary clustering by the integrated infrastructure of telecommunication is as the expansion of base station, provide a kind of covering service among a small circle in family or assigned address such as office scene etc. for the user, to be applied to wired access seldom even do not have in the building of wired access.
Owing to can not accurately estimate and the timing error of macro base station during the HNB initialization, can cause bigger interference, so HNB needs and macro base station keeps synchronously.Existing synchronous implementation comprises IEEE 1588 (the precision interval clock synchronous protocol standard of network measure and control system) V2 synchronization scenario and intercepts the synchronization scenario of macro base station, by hardware and software the internal clock of HNB and the master clock of macro base station are realized synchronously, the utilization of synchronous settling time less than 10 μ s (microsecond) is provided, with Ethernet time of delay 1 of not carrying out the IEEE1588 agreement, 000 μ s compares, and the timing coincident indicator of whole network is significantly improved.
But IEEE 1588V2 synchronization scenario needs HNB and macro base station to belong to same operator, and need all dispose this agreement at all HNB and macro base station, can't be undertaken synchronously by this agreement HNB and the macro base station that does not belong to same operator.
Summary of the invention
The invention provides a kind of method for synchronous, system and equipment of Home eNodeB, with easy realization Home eNodeB and the high-precise synchronization between the macro base station.
The invention provides a kind of method for synchronous of Home eNodeB, may further comprise the steps:
Obtain the down-going synchronous time of delay between macro base station and the Home eNodeB;
Adjust the transmission time started of described Home eNodeB time of delay according to described down-going synchronous to the uplink synchronous channel of described macro base station;
Receive the time offset of the uplink synchronous channel of described macro base station transmission;
Adjust the transmission time started of the descending synchronous signal channel of described Home eNodeB and user terminal.
Preferably, described down-going synchronous time of delay of obtaining between macro base station and the Home eNodeB is for obtaining the transmission delay Δ t of macro base station to the family base station according to path loss
p, detailed process comprises:
Macro base station is to the transmission delay Δ t of family base station
p=macro base station is to family's base station transmits distance/electromagnetic transmission speed; Or
Definition dBL=macro base station is to path loss/path loss rate=(macro base station equivalence theaomni-directional transmission power-Home eNodeB the received power)/path loss rate of family base station;
Macro base station is to the transmission delay Δ t of family base station
p=10^ (dBL/10).
Preferably, be predefined lead described down-going synchronous time of delay of obtaining between macro base station and the Home eNodeB.
Preferably, the described transmission time started T that adjusts to the uplink synchronous channel of macro base station according to down-going synchronous time of delay
TX-UpPCH, be specially:
T
TX-UpPCH＝T
RX-DwPCH-2Δt
p+192T
C
Wherein, T
RX-DwPCHIt is the reception time started with respect to the descending synchronous signal channel of Home eNodeB time; T
CIt is the chip duration; 2 Δ t
pIt is the pre-set time that Home eNodeB sends UpPCH.
Preferably, the transmission time started of described uplink synchronous channel to macro base station is also according to uplink synchronous channel drift number n
UpPCHShiftAdjust, be specially:
T
TX-UpPCH＝T
RX-DwPCH-2Δt
p+192T
C+n
UpPCHShift*16Tc
Wherein, n
UpPCHShift, span is 0 to 127, n
UpPCHShiftBy the upper-layer protocol assignment.
Preferably, comprise before the time offset of the uplink synchronous channel of described reception macro base station transmission:
Macro base station calculates the time offset of uplink synchronous channel;
Described macro base station sends to described Home eNodeB by the rapid physical Random Access Channel with described time offset.
Preferably, described time offset is the time offset UpPCH of the preceding 128 chip end positions of uplink synchronous channel original position of the uplink synchronizing signals that receives of macro base station and macro base station
POS, obtain manner is:
UpPCH
POS＝UpPCH
Rxpath-UpPCH
TS
Wherein, UpPCH
RxpathIt is the time of reception of the uplink synchronous channel of macro base station; UpPCH
TSBe according to the macro base station internal time, the 128chip concluding time before the uplink synchronous channel original position of macro base station.
Preferably, the transmission time started of the descending synchronous signal channel of described adjustment Home eNodeB and user terminal, specifically comprise:
Obtain the two-way time RTT of Home eNodeB to macro base station, wherein, RTT=UpPCH
ADV+ UpPCH
POS-128T
C, wherein, UpPCH
ADVBe according to pre-set time transmission time started of Home eNodeB uplink synchronous channel with respect to protection period GP ending;
The time started T of the descending synchronous signal channel that receives according to Home eNodeB
RX-DwPCHAnd described RTT, the transmission time started T of the descending synchronous signal channel of acquisition Home eNodeB and user terminal
TX-DwPCH, wherein, T
TX-DwPCH=T
RX-DwPCH-RTT/2.
Preferably, described time offset is the time offset SS of the uplink synchronous channel original position of the uplink synchronizing signals that receives and macro base station
HNB, obtain manner comprises:
SS
HNB＝UpPCH
POS-128Tc。
Preferably, the transmission time started T of the descending synchronous signal channel of described adjustment Home eNodeB and user terminal
TX-DwPCH, specifically comprise:
T
TX-DwPCH＝T
TX-UpPTS-192T
C-SS
HNB
Wherein, T
TX-UpPTSBe the transmission time started of Home eNodeB uplink synchronous channel.
On the other hand, the invention provides a kind of system that sets up synchronously of Home eNodeB, comprising:
Home eNodeB, be used to obtain and macro base station between down-going synchronous time of delay, adjust to the transmission time started of the uplink synchronous channel of macro base station time of delay according to described down-going synchronous, and receive the time offset of the uplink synchronous channel that described macro base station sends, adjust the transmission time started with the descending synchronous signal channel of user terminal;
Macro base station is used for obtaining the time offset of uplink synchronous channel according to the transmission time started of described Home eNodeB to the uplink synchronous channel of described macro base station, and described time offset is sent to described Home eNodeB.
On the other hand, the invention provides a kind of Home eNodeB, comprising:
Down-going synchronous postpones acquiring unit, be used to obtain and macro base station between down-going synchronous time of delay;
The uplink synchronous channel transmitting element is used for adjusting to time of delay according to described down-going synchronous transmission time started of the uplink synchronous channel of described macro base station;
The time migration receiving element is used to receive the time offset of the uplink synchronous channel that described macro base station sends;
Lock unit is used to adjust the transmission time started with the descending synchronous signal channel of user terminal.
Preferably, described down-going synchronous delay acquiring unit is used for obtaining the transmission delay Δ t of macro base station to the family base station according to path loss
p, detailed process comprises: macro base station is to the transmission delay Δ t of family base station
p=macro base station is to family's base station transmits distance/electromagnetic transmission speed; Or defining dBL=macro base station path loss/path loss rate=(macro base station equivalence theaomni-directional transmission power-Home eNodeB received power)/path loss rate to the family base station, macro base station is to the transmission delay Δ t of family base station
p=10^ (dBL/10); Or be used for predefined lead as down-going synchronous time of delay.
Preferably, described uplink synchronous channel transmitting element specifically comprises:
Computation subunit is used for calculating transmission time started T
TX-UpPCH, wherein, T
TX-UpPCH=T
RX-DwPCH-2 Δ t
p+ 192T
C, wherein, T
RX-DwPCHIt is the reception time started with respect to the descending synchronous signal channel of Home eNodeB time; T
CIt is the chip duration; 2 Δ t
pIt is the pre-set time that Home eNodeB sends UpPCH;
Send subelement, be used for according to the transmission time started of adjusting uplink synchronous channel described pre-set time.
Preferably,
Described time migration receiving element specifically is used to receive the time offset UpPCH of the preceding 128 chip end positions of uplink synchronous channel original position of uplink synchronizing signals that macro base station receives and macro base station
POS
Described lock unit specifically is used to obtain the two-way time RTT of Home eNodeB to macro base station, wherein, and RTT=UpPCH
ADV+ UpPCH
POS-128T
CAnd the time started T of the descending synchronous signal channel that receives according to Home eNodeB
RX-DwPCHAnd described RTT, the transmission time started T of the descending synchronous signal channel of acquisition Home eNodeB and user terminal
TX-DwPCH, wherein, T
TX-DwPCH=T
RX-DwPCH-RTT/2.
Preferably,
Described time migration receiving element specifically is used to the time offset SS of the uplink synchronous channel original position of the uplink synchronizing signals that receives and macro base station
HNB, wherein, SS
HNB=UpPCH
POS-128T
C
Described lock unit specifically is used for the transmission time started T according to the uplink synchronous channel of Home eNodeB and macro base station
TX-UpPTSAnd SS
HNBObtain T
TX-DwPCH, wherein, T
TX-DwPCH=T
TX-UpPTS-192TC-SS
HNB
On the other hand, the invention provides a kind of macro base station, comprising:
The time migration acquiring unit is used to obtain the time offset of uplink synchronous channel;
The time migration transmitting element is used for described time offset is sent to described Home eNodeB.
Preferably, described time migration acquiring unit is used to calculate the time offset UpPCH of the preceding 128 chip end positions of uplink synchronous channel original position of uplink synchronizing signals that macro base station receives and macro base station
POSOr be used to calculate the time offset SS of the uplink synchronous channel original position of the uplink synchronizing signals of reception and macro base station
HNB
Compared with prior art, the present invention has the following advantages:
The present invention at first uses HNB to pass through DwPTS (Downlink Piloting Time Slot, descending pilot frequency time slot) signal finishes receiving slightly synchronously, HNB adjusts the transmission time started of uplink synchronous channel time of delay according to down-going synchronous then, at last, macro base station is indicated the HNB time offset on FPACH, final HNB and the macro base station time precise synchronization of guaranteeing launched DwPTS to user terminal according to this precise synchronization time, reduces system interference.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the burst structure schematic diagram of DwPCH among the present invention (DwPTS);
Fig. 2 is the burst structure schematic diagram of UpPCH among the present invention (UpPTS);
Fig. 3 is the method for synchronous flow chart of Home eNodeB and macro base station among the present invention;
Fig. 4 is a UpPTS simultaneous bias schematic diagram among the present invention;
Fig. 5 is that the sync bit that HNB issues according to FPACH among the present invention calculates DwPCH transmitting site schematic diagram;
Fig. 6 be among the present invention a kind of Home eNodeB set up system construction drawing synchronously;
Fig. 7 is a kind of Home eNodeB structure chart among the present invention;
Fig. 8 is a kind of macro base station structure chart among the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
HNB intercepts the descending DwPTS of macro base station (descending pilot frequency time slot) earlier among the present invention when starting working, and obtains the down-going synchronous time of delay between macro base station and the Home eNodeB; Go up according to down-going synchronous at UpPTS (uplink pilot time slot) then and send uplink synchronous information in UpPCH (uplink synchronous channel) open loop time of delay, after macro base station is received the uplink synchronous information that UpPCH sends, computing time, side-play amount was also by FPACH (Fast Physical Access Channel, physical access channel) time offset is sent to HNB, HNB adjusts the time precision with macro base station, pass through DwPCH (descending synchronous signal channel) synchronized transmission down-going synchronous information to user terminal, to reduce interference.
The method for synchronous of Home eNodeB provided by the invention and macro base station is mainly used in TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, the CDMA (Code Division Multiple Access) that time-division is synchronous) system also can be applied to the system that other have correlation properties.The present invention is that example describes with the TD-SCDMA system mainly.Wherein, the TD-SCDMA physical channel is 4 layers of structure: superframe, radio frames, subframe and time slot/sign indicating number.A long 720ms of superframe (millisecond) is made up of 72 radio frames, each is wireless frame length 10ms; Each radio frames is divided into the subframe of two 5ms; Each subframe comprises that 7 main time slots (are business time-slot; length 675 μ s) and 3 special time slots; the length of each main time slot is the duration of 864 chips, and 3 special time slots comprise downward guide time slot (DwPTS), up guide time slot (UpPTS) and protection time slot (GP).
Main time slot comprises the intermediate code of two data, 144 chips and the protection zone of one 16 chip.Data field totally 704 chips is long, and each bit is modulated with QPSK (Quadrature Phase ShiftKeying, Quadrature Phase Shift Keying) in the data field, and spread spectrum coefficient is 1 to 16.Intermediate code is as training sequence, and channel guess value uses during for Multiuser Detection (joint-detection or interference counteracting).DwPTS accounts for 96 chip durations; UpPTS accounts for 160 chip durations; GP (protection time slot) accounts for 96 chip durations.
In the TD-SCDMA system, DwPCH is used for down-going synchronous, and UpPCH is used for uplink synchronous, and DwPCH sends with the antenna figuration that provides full sub-district to cover in each subframe, and the continuous power level that provides with high-level signaling sends.There are 32 different basic SYNC-DL sign indicating numbers (long 64chip) in the TD-SCDMA system, and 256 different basic SYNC-UL sign indicating numbers (long 128chip) are arranged; Burst structure such as Fig. 1 of DwPCH (DwPTS), burst structure such as Fig. 2 of UpPCH (UpPTS).
The method for synchronous of Home eNodeB among the present invention (HNB) and macro base station, detailed process may further comprise the steps as shown in Figure 3:
Step 301 when HNB starts working, is carried out search of initial zone, reads macro base station and goes up the content of broadcasting at BCH (Broadcast Channel, broadcast channel), sets up synchronously according to content that reads and macro base station, finishes resident process.The specific implementation process comprises:
1, read the content on the macro base station BCH that searches, the content on the BCH is decoded, obtain the descriptor of FPACH channel, for example scrambler, spreading factor, midambles and time slot etc.
2, search DwPTS, HNB utilize the SYNC-DL among the DwPTS to obtain DwPTS synchronizing information with macro base station.Be specially: HNB need discern use is in 32 SYNC-DL sequences which, mates with the SYNC-DL that elects from the PN sequence sets that receives by one or more matched filters and realizes synchronously.
3, identification scrambler and basic midamble sign indicating number, HNB receives the midamble sign indicating number on the P-CCPCH (Primary CommonControl Physical Channel, Primary Common Control Physical Channel), and DwPTS is after P-CCPCH.In TD-SCDMA, corresponding one group 4 the different basic midamble sign indicating numbers of each DwPTS.Therefore have 128 midamble sign indicating numbers, and non-overlapping copies each other.
Because the basic midamble code character of SYNC_DL and P-CCPCH is corresponding one by one, can determine 4 basic midamble sign indicating numbers by detected SYNC_DL, HNB also knows and has used which 4 basic midamble sign indicating number, in addition, because each basic midamble sign indicating number is associated with a scrambler, has also just known scrambler.In the TD-SCDMA system, the sign indicating number of identifying cells is called descending synchronous code (SYNC-DL) sequence, and in the descending pilot frequency time slot emission, macro base station will be in the omni-directional transmissions of sub-district.It is 64 basic SYNC-DL that whole system has 32 group length, each base station of SYNC-DL sign and a corresponding code character (comprising 8 uplink synchronous codes, 4 scramblers and 4 basic midamble sign indicating numbers).
4, the control multi-frame is synchronous, and the MIB (main indicating module) of the BCH multi-frame in the HNB search P-CCPCH is indicated with respect to the QPSK phase modulated of the midamble on P-CCPCH by DwPTS.The control multi-frame is located by the QPSK symbol sebolic addressing that is modulated on the DwPTS.From 32 SYNC-DL associated codes that use the sub-district, seek out some associated codes and determine position in the DwPTS time domain to determine the synchronization basic standard point, carry out obtaining synchronizing channel after the Synchronous Processing, reach synchronous effect with this.
1, the path loss that P-CCPCH (Primary Common Control Physical Channel, Primary Common Control Physical Channel) that the HNB utilization receives and/or DwPCH power obtain obtains the down-going synchronous time of delay Δ t of macro base station to HNB
p
Wherein, Δ t
pComputational process be:
Macro base station is to the transmission delay Δ t of family base station
p=macro base station is to family's base station transmits distance/electromagnetic transmission speed;
In the practical application, Δ t
pComputational process can be by following formula (1) and (2) acquisition:
Definition dBL=macro base station is to path loss/path loss rate=(macro base station equivalence theaomni-directional transmission power-Home eNodeB the received power)/path loss rate of family base station; (1)
Macro base station is to the transmission delay Δ t of HNB
p=10^ (dBL/10), i.e. (dBL/10) inferior power of 10;
(2)
In the formula (1), macro base station equivalence theaomni-directional transmission power can be by P-CCPCH or DwPCH notice HNB, and measurement obtained when the HNB received power received P-CCPCH or DwPCH by HNB, and the path loss rate is a known constant.
Certainly, above-mentioned propagation delay time Δ t
pNot only can obtain by path loss calculation, also can obtain by other modes, for example: the lead that a definite value directly is set by HNB is as propagation delay time Δ t
p, this time can rule of thumb be worth setting, for example 16T
CDeng.
2, HNB is according to down-going synchronous Δ time of delay t
pReach the DwPCH time of reception and determine that UpPCH sends the time started, as shown in Figure 4.The position of UpPCH can be positioned at UpPTS, and UpPCH sends time started T
TX-UpPCHDetermine mode such as formula (3)
T
TX-UpPCH＝T
RX-DwPCH-2Δt
p+192T
C (3)
Wherein, T
TX-UpPCHBe the UpPCH transmission time started with respect to the HNB time, the result is expressed as the integral multiple of 1/8 chip; T
RX-DwPCHIt is the DwPCH reception time started with respect to the HNB time; T
CIt is the chip duration; 2 Δ t
pBe the pre-set time that HNB sends UpPCH, promptly one-way transmission postpones Δ t
pTwice.
When system considers Upshifting, also can be positioned at other up on-position of system's appointment, particular location is disposed by high level.Wherein, Upshifting is according to base station (Node B) interferometry to ascending time slot by radio network controller (RNC), adjust the position of ascending pilot channel (UpPCH) flexibly, as adjust to business time-slot TS1, also be adjustable to TS2 in case of necessity, rather than be confined to the UpPTS time slot, evade the interference purpose to reach.UpPCH sends time started T
TX-UpPCHDetermine mode such as formula (4),
T
TX-UpPCH＝T
RX-DwPCH-2Δt
p+12*16T
C+n
UpPCHShift*16Tc (4)
Wherein, n
UpPCHShiftBe the selected works of a quantitative value, span is 0 to 127 natural number, n
UpPCHShift* 16Tc several chip that represent to be shifted, n
UpPCHShiftBy the upper-layer protocol assignment; T
TX-UpPCHBe that UpPCH sends the time started, the result is expressed as the integral multiple of 1/8 chip; T
RX-DwPCHIt is the DwPCH reception time started with respect to the HNB time; T
CIt is the chip duration; 2 Δ t
pBe the pre-set time that HNB sends UpPCH, promptly one-way transmission postpones Δ t
pTwice.
When HNB carries out cell initial search, will keep down-going synchronous and read cell broadcast information.The SYNC-DL sign indicating number that uses from DwPTS, HNB can obtain distributing to the sign indicating number collection of 8 SYNC_UL sign indicating numbers (signature) of UpPCH.Because the SYNC_UL sign indicating number can be by the selected priority of high level, and under this priority picked at random again, so macro base station it is also conceivable that to HNB and uses the SYNC_UL sign indicating number that independent identification is set.
Detailed process comprises:
1, macro base station detects the SYNC-UL sequence in search window after, computing time side-play amount; Macro base station need calculate the time offset UpPCH of 128chip end position before the UpPCH original position of the SYNC-UL of reception and macro base station
POS, be expressed as the integral multiple of 1/8 chip, take 11 bits (0-2047), get the numerical value of the most close UpPCH receiving position during value.
UpPCH
POS＝UpPCH
Rxpath-UpPCH
TS (5)
Wherein, UpPCH
Rxpath, be the time of reception of macro base station at the SYNC-UL of synchronizing process; UpPCH
TS, be according to the macro base station internal time, the 128chip concluding time before the UpPCH original position of macro base station.
2, macro base station in FPACH (Fast Physical Access Channel, rapid physical Random Access Channel) with UpPCH
POSSend to HNB.FPACH be Node B in single burst, carry to sending to the response of subscriber equipment, the detection signal that this response has regularly and the power level adjustment is indicated; The description of FPACH channel all can be broadcasted on BCH.
3, HNB next time when user terminal sends DwPTS, adjust DwPTS and send the time started.HNB receives the adjustment of the laggard line time precision of the time offset that issues by FPACH, determines the transmitting time to user terminal DwPTS, finishes the synchronous of HNB and macro base station.Rebuliding synchronously when this synchronizing process also can be used for step-out.Detailed process comprises:
HNB comprises macro base station and sends and to carry UpPCH receiving
POSFPACH after, calculate the RTT (Round-Trip Time, two-way time) of HNB to macro base station.
RTT＝UpPCH
ADV+UpPCH
POS-8*16T
C (6)
Wherein, UpPCH
ADV, be according to pre-set time transmission time started of Home eNodeB uplink synchronous channel with respect to protection period GP ending.
HNB sends the time started T of DwPCH to user terminal
TX-DwPCHFor:
T
TX-DwPCH＝T
RX-DwPCH-RTT/2 (7)
Step 305, but repeating step 303～step 304 be averaged for many times, obtain the precise time that HNB sends DwPCH, so far, the synchronous foundation of HNB and macro base station.
Step 306, HNB finishes the initial synchronisation trapped state, changes normal operating conditions over to.At T
TX-DwPCHSend the DwPTS of HNB constantly to user terminal.The sequential that transmits and receives of other each time slots is all calculated according to this.
In the inventive method, step 304 can also realize in the following way, referring to Fig. 5:
Macro base station calculates
SS
HNB＝UpPCH
POS-128Tc (8)
SS
HNBBe the uplink synchronizing signals that the receives time offset with the uplink synchronous channel original position of macro base station, promptly HNB is through the thick UpPCH of adjustment synchronously
ADVAfter, sending to the further time offset of the uplink synchronous pilot tone of macro base station, the result is expressed as the integral multiple of 1/8 chip;
T
TX-DwPCH＝T
TX-UpPTS-192T
C-SS
HNB (9)
Wherein, T
TX-DwPCHThe DwPCH that is the relative HNB time sends the time started; T
TX-UpPTSSend the time started of UpPTS for HNB.
The invention provides a kind of system that sets up synchronously of Home eNodeB, as shown in Figure 6, comprise: Home eNodeB 610, be used to obtain and macro base station 620 between down-going synchronous time of delay, adjust to the transmission time started of the uplink synchronous channel of macro base station 620 time of delay according to down-going synchronous, and the time offset of the uplink synchronous channel of reception macro base station 620 transmissions, and the transmission time started of the descending synchronous signal channel of adjustment and user terminal; Macro base station 620 is used for obtaining the time offset of uplink synchronous channel according to the transmission time started of Home eNodeB 610 to the uplink synchronous channel of macro base station 620, and time offset is sent to Home eNodeB 610.
The invention provides a kind of Home eNodeB, as shown in Figure 7, comprising: down-going synchronous postpones acquiring unit 710, be used to obtain and macro base station between down-going synchronous time of delay; Uplink synchronous channel transmitting element 720 is used for adjusting to time of delay according to down-going synchronous transmission time started of the uplink synchronous channel of macro base station; Time migration receiving element 730 is used to receive the time offset of the uplink synchronous channel that described macro base station sends; Lock unit 740 is used to adjust the transmission time started with the descending synchronous signal channel of user terminal.
Wherein, down-going synchronous delay acquiring unit 710 is used for obtaining the transmission delay Δ t of macro base station to the family base station according to path loss
p, detailed process comprises: macro base station is to the transmission delay Δ t of family base station
p=macro base station is to family's base station transmits distance/electromagnetic transmission speed; Or defining dBL=macro base station path loss/path loss rate=(macro base station equivalence theaomni-directional transmission power-Home eNodeB received power)/path loss rate to the family base station, macro base station is to the transmission delay Δ t of family base station
p=10^ (dBL/10); Or with predefined lead as down-going synchronous time of delay.
Wherein, uplink synchronous channel sends Unit 720 and specifically comprises:
Computation subunit is used for calculating transmission time started T
TX-UpPCH, wherein, T
TX-UpPCH=T
RX-DwPCH-2 Δ t
p+ 192T
C, wherein, T
RX-DwPCHIt is the reception time started with respect to the descending synchronous signal channel of Home eNodeB time; T
CIt is the chip duration; 2 Δ t
pIt is the pre-set time that Home eNodeB sends UpPCH;
Send subelement, be used for according to the transmission time started of adjusting uplink synchronous channel described pre-set time.
Wherein, time migration receiving element 730 specifically is used to receive the time offset UpPCH of the preceding 128 chip end positions of uplink synchronous channel original position of uplink synchronizing signals that macro base station receives and macro base station
POSOr be used to receive the time offset SS of the uplink synchronous channel original position of uplink synchronizing signals that macro base station receives and macro base station
HNB, wherein, SS
HNB=UpPCH
POS-128T
C
The invention provides a kind of macro base station, as shown in Figure 8, comprising: time migration acquiring unit 810 is used to obtain the time offset of uplink synchronous channel; Time migration transmitting element 820 is used for described time offset is sent to described Home eNodeB.
Wherein, time migration acquiring unit 810 is used to calculate the time offset UpPCH of the preceding 128 chip end positions of uplink synchronous channel original position of uplink synchronizing signals that macro base station receives and macro base station
POSOr by the time offset SS of the uplink synchronous channel original position of calculating uplink synchronizing signals that macro base station receives and macro base station
HNBCalculate the time offset of uplink synchronous.
The present invention has set forth the process of setting up synchronously of TD-SCDMA Home eNodeB HNB and macro base station.The present invention is directed to system, do not rely on specific network protocol, therefore the restriction of having avoided IEEE1588V2 Technology Need access network to unify operator with TD-SCDMA.
The present invention at first uses HNB synchronously thick by finishing receiving of DwPTS signal, HNB adjusts the transmission time started of uplink synchronous channel time of delay according to down-going synchronous then, at last, macro base station is indicated the HNB time offset on FPACH, final HNB and the macro base station time precise synchronization of guaranteeing, launch DwPTS to user terminal according to this precise synchronization time, reduce system interference.The present invention in contrast to the synchronization scenario that intercept the base station, and is not only synchronously thick by finishing receiving of down-bound pilot frequency signal, and needs the meticulous calculating decision synchronism deviation by a few step side-play amounts, obviously is better than existing base station intercepting method at synchronization accuracy.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.
Claims (18)
1. the method for synchronous of a Home eNodeB is characterized in that, may further comprise the steps:
Obtain the down-going synchronous time of delay between macro base station and the Home eNodeB;
Adjust the transmission time started of described Home eNodeB time of delay according to described down-going synchronous to the uplink synchronous channel of described macro base station;
Receive the time offset of the uplink synchronous channel of described macro base station transmission;
Adjust the transmission time started of the descending synchronous signal channel of described Home eNodeB and user terminal.
2. the method for claim 1 is characterized in that, described down-going synchronous time of delay of obtaining between macro base station and the Home eNodeB is for obtaining the transmission delay Δ t of macro base station to the family base station according to path loss
p, detailed process comprises:
Macro base station is to the transmission delay Δ t of family base station
p=macro base station is to family's base station transmits distance/electromagnetic transmission speed; Or
Definition dBL=macro base station is to path loss/path loss rate=(macro base station equivalence theaomni-directional transmission power-Home eNodeB the received power)/path loss rate of family base station;
Macro base station is to the transmission delay Δ t of family base station
p=10^ (dBL/10).
3. the method for claim 1 is characterized in that, be predefined lead described down-going synchronous time of delay of obtaining between macro base station and the Home eNodeB.
4. the method for claim 1 is characterized in that, the described transmission time started T that adjusts to the uplink synchronous channel of macro base station according to down-going synchronous time of delay
TX-UpPCH, be specially:
T
TX-UpPCH＝T
RX-DwPCH-2Δt
p+192T
C
Wherein, T
RX-DwPCHIt is the reception time started with respect to the descending synchronous signal channel of Home eNodeB time; T
CIt is the chip duration; 2 Δ t
pIt is the pre-set time that Home eNodeB sends UpPCH.
5. method as claimed in claim 4 is characterized in that, the transmission time started of described uplink synchronous channel to macro base station is also according to uplink synchronous channel drift number n
UpPCHShiftAdjust, be specially:
T
TX-UpPCH＝T
RX-DwPCH-2Δt
p+192T
C+n
UpPCHShift*16Tc
Wherein, n
UpPCHShiftSpan is 0 to 127, n
UpPCHShiftBy the upper-layer protocol assignment.
6. the method for claim 1 is characterized in that, comprises before the time offset of the uplink synchronous channel that described reception macro base station sends:
Macro base station calculates the time offset of uplink synchronous channel;
Described macro base station sends to described Home eNodeB by the rapid physical Random Access Channel with described time offset.
7. method as claimed in claim 6 is characterized in that, described time offset is the time offset UpPCH of the preceding 128 chip end positions of uplink synchronous channel original position of the uplink synchronizing signals that receives of macro base station and macro base station
POS, obtain manner is:
UpPCH
POS＝UpPCH
Rxpath-UpPCH
TS
Wherein, UpPCH
RxpathIt is the time of reception of the uplink synchronous channel of macro base station; UpPCH
TSBe according to the macro base station internal time, the 128chip concluding time before the uplink synchronous channel original position of macro base station.
8. method as claimed in claim 7 is characterized in that, the transmission time started of the descending synchronous signal channel of described adjustment Home eNodeB and user terminal, specifically comprises:
Obtain the two-way time RTT of Home eNodeB to macro base station, wherein, RTT=UpPCH
ADV+ UpPCH
POS-128T
C, wherein, UpPCH
ADVBe according to pre-set time transmission time started of Home eNodeB uplink synchronous channel with respect to protection period GP ending;
The time started T of the descending synchronous signal channel that receives according to Home eNodeB
RX-DwPCHAnd described RTT, the transmission time started T of the descending synchronous signal channel of acquisition Home eNodeB and user terminal
TX-DwPCH, wherein, T
TX-DwPCH=T
RX-DwPCH-RTT/2.
9. method as claimed in claim 7 is characterized in that, described time offset is the time offset SS of the uplink synchronous channel original position of the uplink synchronizing signals that receives and macro base station
HNB, obtain manner comprises:
SS
HNB＝UpPCH
POS-128Tc。
10. method as claimed in claim 9 is characterized in that, the transmission time started T of the descending synchronous signal channel of described adjustment Home eNodeB and user terminal
TX-DwPCH, specifically comprise:
T
TX-DwPCH＝T
TX-UpPTS-192T
C-SS
HNB
Wherein, T
TX-UpPTSBe the transmission time started of Home eNodeB uplink synchronous channel.
11. the system that sets up synchronously of a Home eNodeB is characterized in that, comprising:
Home eNodeB, be used to obtain and macro base station between down-going synchronous time of delay, adjust to the transmission time started of the uplink synchronous channel of macro base station time of delay according to described down-going synchronous, and receive the time offset of the uplink synchronous channel that described macro base station sends, adjust the transmission time started with the descending synchronous signal channel of user terminal;
Macro base station is used for obtaining the time offset of uplink synchronous channel according to the transmission time started of described Home eNodeB to the uplink synchronous channel of described macro base station, and described time offset is sent to described Home eNodeB.
12. a Home eNodeB is characterized in that, comprising:
Down-going synchronous postpones acquiring unit, be used to obtain and macro base station between down-going synchronous time of delay;
The uplink synchronous channel transmitting element is used for adjusting to time of delay according to described down-going synchronous transmission time started of the uplink synchronous channel of described macro base station;
The time migration receiving element is used to receive the time offset of the uplink synchronous channel that described macro base station sends;
Lock unit is used to adjust the transmission time started with the descending synchronous signal channel of user terminal.
13. Home eNodeB as claimed in claim 12 is characterized in that, described down-going synchronous postpones acquiring unit and is used for obtaining the transmission delay Δ t of macro base station to the family base station according to path loss
p, detailed process comprises: macro base station is to the transmission delay Δ t of family base station
p=macro base station is to family's base station transmits distance/electromagnetic transmission speed; Or defining dBL=macro base station path loss/path loss rate=(macro base station equivalence theaomni-directional transmission power-Home eNodeB received power)/path loss rate to the family base station, macro base station is to the transmission delay Δ t of family base station
p=10^ (dBL/10); Or with predefined lead as down-going synchronous time of delay.
14. Home eNodeB as claimed in claim 12 is characterized in that, described uplink synchronous channel transmitting element specifically comprises:
Computation subunit is used for calculating transmission time started T
TX-UpPCH, wherein, T
TX-UpPCH=T
RX-DwPCH-2 Δ t
p+ 192T
C, wherein, T
RX-DwPCHIt is the reception time started with respect to the descending synchronous signal channel of Home eNodeB time; T
CIt is the chip duration; 2 Δ t
pIt is the pre-set time that Home eNodeB sends UpPCH;
Send subelement, be used for according to the transmission time started of adjusting uplink synchronous channel described pre-set time.
15. Home eNodeB as claimed in claim 12 is characterized in that,
Described time migration receiving element specifically is used to receive the time offset UpPCH of the preceding 128 chip end positions of uplink synchronous channel original position of uplink synchronizing signals that macro base station receives and macro base station
POS
Described lock unit specifically is used to obtain the two-way time RTT of Home eNodeB to macro base station, wherein, and RTT=UpPCH
ADV+ UpPCH
POS-128T
CAnd the time started T of the descending synchronous signal channel that receives according to Home eNodeB
RX-DwPCHAnd described RTT, the transmission time started T of the descending synchronous signal channel of acquisition Home eNodeB and user terminal
TX-DwPCH, wherein, T
TX-DwPCH=T
RX-DwPCH-RTT/2.
16. Home eNodeB as claimed in claim 12 is characterized in that,
Described time migration receiving element specifically is used to receive the time offset SS of the uplink synchronous channel original position of uplink synchronizing signals and macro base station
HNB, wherein, SS
HNB=UpPCH
POS-128T
C
Described lock unit specifically is used for the transmission time started T according to the Home eNodeB uplink synchronous channel
TX-UpPTSAnd SS
HNBObtain T
TX-DwPCH, wherein, T
TX-DwPCH=T
TX-UpPTS-192T
C-SS
HNB
17. a macro base station is characterized in that, comprising:
The time migration acquiring unit is used to obtain the time offset of uplink synchronous channel;
The time migration transmitting element is used for described time offset is sent to described Home eNodeB.
18. macro base station as claimed in claim 17 is characterized in that, described time migration acquiring unit is used to obtain the time offset UpPCH of the preceding 128 chip end positions of uplink synchronous channel original position of uplink synchronizing signals that macro base station receives and macro base station
POSOr be used to obtain the time offset SS of the uplink synchronous channel original position of the uplink synchronizing signals of reception and macro base station
HNB
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Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |
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Effective date of registration: 20210608 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |