CN103096454A - Synchronized method of household base station and macro base station and household base station - Google Patents
Synchronized method of household base station and macro base station and household base station Download PDFInfo
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- CN103096454A CN103096454A CN2011103394035A CN201110339403A CN103096454A CN 103096454 A CN103096454 A CN 103096454A CN 2011103394035 A CN2011103394035 A CN 2011103394035A CN 201110339403 A CN201110339403 A CN 201110339403A CN 103096454 A CN103096454 A CN 103096454A
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- home enodeb
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Abstract
The invention provides a synchronized method of a household base station and a macro base station and a household base station, wherein the synchronized method of the household base station and the macro base station comprises: when the household base station is powered on for the first time, propagation time delay between the household base station and the macro base station is confirmed, the household base station is in synchronized adjustment with the macro base station according to the propagation time delay, and the propagation time delay is preserved in the household base station; when the household base station is powered on again, the household base station is in synchronized adjustment with the macro base station according to the propagation time delay preserved in the household base station. The household base station is used for preserving the propagation time delay obtained in the former synchronized adjustment to conduct the synchronized adjustment again, and therefore the synchronized process prescribed in an existing communication protocol does not need to be carried out repeatedly, and waste of communication resources is avoided.
Description
Technical field
The present invention relates to synchronous method and the Home eNodeB of a kind of Home eNodeB and macro base station, belong to the simultaneous techniques field of wireless base station.
Background technology
Home eNodeB (Home Node B, be called for short: HNB) be a kind of femtocell (FEMTO CELL) cell base station, Home eNodeB need to macro base station (the Macro Node B as synchronization object, be called for short: keep synchronous MNB), to reach the clock synchronous of HNB and synchronization object.
Yet, only stipulated subscriber equipment (User Equipment in existing communication protocol, be called for short: UE) and the synchronizing process between MNB, because UE is in continuous movement, the change of position can affect the synchronous effect between UE and MNB, therefore UE needs constantly repeatedly to carry out the synchronizing process of stipulating in the existing communication agreement, thereby has taken a large amount of communication resources.
By contrast, Home eNodeB does not need constantly to move as UE, therefore, if Home eNodeB is also still once and again carried out the synchronizing process of stipulating in the existing communication agreement, can cause unnecessary waste to the communication resource.
Summary of the invention
The invention provides synchronous method and the Home eNodeB of a kind of Home eNodeB and macro base station, in order to reduce the waste that the communication resource is caused.
One aspect of the present invention provides the synchronous method of a kind of Home eNodeB and macro base station, comprising:
When described Home eNodeB powers on first, determine the propagation delay between described Home eNodeB and described macro base station;
Described Home eNodeB is synchronizeed with described macro base station according to described propagation delay and is adjusted, and described propagation delay is kept in described Home eNodeB;
When described Home eNodeB powers on again, synchronize with described macro base station according to the described propagation delay of having preserved in this Home eNodeB and adjust.
The present invention provides a kind of Home eNodeB on the other hand, comprising:
The time delay determination module is used for determining the propagation delay between described Home eNodeB and macro base station when described Home eNodeB powers on first;
Time delay is preserved module, is used for the described propagation delay that the time delay determination module is determined is kept at described Home eNodeB;
Synchronous adjusting module is used for synchronizeing with described macro base station according to the described propagation delay that the time delay determination module is determined adjusting; And be used for when described Home eNodeB powers on again, the described propagation delay of having preserved in described Home eNodeB according to time delay preservation module is synchronizeed with described macro base station and is adjusted.
The present invention synchronously adjusts again by preserving by Home eNodeB the propagation delay that obtains when synchronously adjusting before this, thereby need not once and again to carry out the synchronizing process of stipulating in the existing communication agreement, has therefore avoided the waste of the communication resource.
Description of drawings
Fig. 1 is the flow chart of the synchronous method embodiment of Home eNodeB of the present invention and macro base station;
Fig. 2 is the concrete time slot position schematic diagram of step 110 and step 120 in Fig. 1;
Fig. 3 is the structural representation of Home eNodeB embodiment of the present invention;
Fig. 4 is the concrete structure schematic diagram of time delay determination module 10 shown in Figure 3;
Fig. 5 is the concrete structure schematic diagram of synchronous adjusting module 20 shown in Figure 3.
Embodiment
Fig. 1 is the flow chart of the synchronous method embodiment of Home eNodeB of the present invention and macro base station, and as shown in the figure, the method comprises the steps:
Particularly, definite process of this propagation delay will be elaborated in subsequent content.
Concrete synchronous adjustment process will be elaborated in subsequent content.
The described method of the present embodiment is synchronously adjusted again by preserving by Home eNodeB the propagation delay that obtains when synchronously adjusting before this, thereby need not once and again to carry out the synchronizing process of stipulating in the existing communication agreement, therefore avoided the waste of the communication resource.
Illustrate for example definite process and the described synchronous adjustment process of above-mentioned steps 120 of propagation delay described in above-mentioned steps 110 referring to Fig. 2.
(1) (Global Positioning System is called for short: GPS) keep synchronous, and send down-bound pilot frequency signal in descending pilot frequency time slot for macro base station and global positioning system.
(2) before carrying out synchronizing process, owing to there being timing error, HNB lags behind macro base station.
When (3) HNB received the down-bound pilot frequency signal that comes from described macro base station, the reception initial time of determining the descending pilot frequency time slot of this HNB was T
RX-DwPTS, at this moment, the time delay that HNB lags behind macro base station is propagation delay T_delay.
(4) HNB estimates to obtain estimation time delay t by path loss
p, according to this estimation time delay t
pCalculate the transmission initial time T of the uplink pilot time slot of this HNB
TX-UpPTS=T
RX-DwPTS-2t
p+ 12 * 16T
C, with T
TX-UpPTSFor sending uplink pilot signal to described macro base station in the uplink pilot time slot that sends initial time, wherein, 2t
pExpression Timing Advance UpPTS
ADV
(5) macro base station calculates the starting position UpPTS of the uplink pilot time slot of HNB according to described uplink pilot signal
POS=128T
C+ UpPTS
Rxpath-UpPTS
TS, wherein, UpPTS
RxpathReceive the initial time of described uplink pilot signal for macro base station, UpPTS
TSIt is the concluding time of 128 chips before the UpPTS original position for the internal time according to macro base station.And with described UpPTS
POSSend to described HNB.
(6) described HNB is according to the UpPTS from described macro base station
POSCalculating propagation delay is T_delay=(UpPTS
ADV+ UpPTS
POS-8 * 16T
C)/2.
(7) obtain after synchronously adjusting according to synchronous criterion 1 according to described propagation delay:
T
TX-UpPTS＝T
RX-UpPTS-2×T_delay
T
TX-DwPTS＝T
RX?DwPTS-2×T_delay
Wherein, T
TX-UpPTSThe transmission initial time of the UpPTS time slot of expression in HNB, the local clock record by HNB obtains, T
TX-DwPTSThe transmission initial time of the DwPTS time slot in expression HNB, the reception initial time of the UpPTS time slot in expression HNB, T
RX-DwPTSThe reception initial time of the DwPTS time slot in expression HNB.
(8) obtain after synchronously adjusting according to synchronous criterion 2 according to described propagation delay:
T
TX-DwPTS＝T
RX-DwPTS-T_delay
Fig. 3 is the structural representation of Home eNodeB embodiment of the present invention, and in order to realize said method, as shown in the figure, this Home eNodeB comprises: time delay determination module 10, time delay are preserved module 20 and synchronous adjusting module 30, and its operation principle is as follows:
When described Home eNodeB powers on first, by the propagation delay between the definite described Home eNodeB of time delay determination module 10 and macro base station; Particularly, definite process of this propagation delay will be elaborated in subsequent content.After this, synchronizeed with described macro base station according to time delay determination module 10 definite described propagation delays by synchronous adjusting module 30 and adjust, and the described propagation delays of time delay determination module 10 being determined by time delay preservation module 20 are kept in described Home eNodeB; Concrete synchronous adjustment process will be elaborated in subsequent content.
When described Home eNodeB powers on again, preserve according to time delay described propagation delay that module 20 preserved by synchronous adjusting module 30 in described Home eNodeB and synchronize with described macro base station and adjust.
The present embodiment is synchronously adjusted again by preserving by Home eNodeB the propagation delay that obtains when synchronously adjusting before this, thereby need not once and again to carry out the synchronizing process of stipulating in the existing communication agreement, has therefore avoided the waste of the communication resource.
Referring to Fig. 4, introduce in detail definite process of above-mentioned propagation delay:
When described Home eNodeB receives the down-bound pilot frequency signal that comes from described macro base station, as shown in Figure 4, determine that by the lower start of line determining unit 11 in time delay determination module 10 the reception initial time of the descending pilot frequency time slot of this Home eNodeB is T
RX-DwPTSThen estimate to obtain estimation time delay t by up initial calculation unit 12 by path loss
p, and calculate the transmission initial time T of the uplink pilot time slot of this Home eNodeB
TX-UpPTS=T
RX-DwPTS-2t
p+ 12 * 16T
CAfter this, the T that is obtained at above start of line computing unit 12 by ascending pilot frequency transmitting element 13
TX-UpPTSFor sending uplink pilot signal to described macro base station in the uplink pilot time slot that sends initial time; After macro base station is received this uplink pilot signal, the starting position UpPTS of the uplink pilot time slot of the described Home eNodeB that calculates according to described uplink pilot signal
POS
After this, by propagation delay computing unit 14 according to UpPTS
POSCalculating described propagation delay is T_delay=(UpPTS
ADV+ UpPTS
POS-8 * 16T
C)/2, wherein, UpPTS
ADV=2t
p
Referring to Fig. 5, introduce in detail above-mentioned synchronous adjustment process:
According to the definite propagation delay of described time delay determination module 10, when synchronously adjusting according to synchronous criterion 1, as shown in Figure 5, the transmission initial time by the uplink pilot time slot of ascending pilot frequency setting unit 21 these the described Home eNodeB in synchronous adjusting module 21 is set to T
TX-UpPTS=T
RX-UpPTS-2 * T_delay, wherein, T
RX-UpPTSReception initial time for the uplink pilot time slot of this Home eNodeB; And be set to T by the transmission initial time of the descending pilot frequency time slot of descending pilot frequency setting unit 22 described Home eNodeB
TX-DwPTS=T
RX-DwPTS-2 * T_delay, wherein, T
RX-DwPTSBe the reception initial time of the descending pilot frequency time slot of this Home eNodeB, the local clock record by HNB obtains.
According to the propagation delay that described time delay determination module 10 is determined, when synchronously adjusting according to synchronous criterion 2, the transmission initial time of the uplink pilot time slot of described synchronous adjusting module 20 described Home eNodeB is set to T
TX-DwPTS=T
RX-DwPTS-T_delay, wherein, T
RX-DwPTSReception initial time for the descending pilot frequency time slot of this Home eNodeB.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be completed by the hardware that program command is correlated with, aforesaid program can be stored in a computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. the synchronous method of a Home eNodeB and macro base station, is characterized in that, comprising:
When the family base station powers on first, determine the propagation delay between this Home eNodeB and macro base station;
Described Home eNodeB is synchronizeed with described macro base station according to described propagation delay and is adjusted, and described propagation delay is kept in described Home eNodeB;
When described Home eNodeB powers on again, synchronize with described macro base station according to the described propagation delay of having preserved in this Home eNodeB and adjust.
2. method according to claim 1, is characterized in that, the propagation delay between described definite described Home eNodeB and described macro base station comprises:
When described Home eNodeB received the down-bound pilot frequency signal that comes from described macro base station, the reception initial time of determining the descending pilot frequency time slot of this Home eNodeB was T
RX-DwPTS
Described Home eNodeB estimates to obtain estimation time delay t by path loss
p, and calculate the transmission initial time T of the uplink pilot time slot of this Home eNodeB
TX-UpPTS=T
RX-DwPTS-2t
p+ 12 * 16T
C
Described Home eNodeB is with T
TX-UpPTSFor sending uplink pilot signal to described macro base station in the uplink pilot time slot that sends initial time;
Described macro base station calculates the starting position UpPTS of the uplink pilot time slot of described Home eNodeB according to described uplink pilot signal
POS, and send to described Home eNodeB;
Described Home eNodeB is according to described UpPTS
POSCalculating described propagation delay is T_delay=(UpPTS
ADV+ UpPTS
POS-8 * 16T
C)/2, wherein, UpPTS
ADV=2t
p
3. method according to claim 2, is characterized in that, described Home eNodeB is synchronizeed with described macro base station according to described propagation delay to adjust and comprised:
The transmission initial time of the uplink pilot time slot of described this Home eNodeB of Home eNodeB is set to T
TX-UpPTS=T
RX-UpPTS-2 * T_delay, and the transmission initial time of the descending pilot frequency time slot of this Home eNodeB is set to T
TX-DwPTS=T
RX-DwPTS-2 * T_delay, wherein, T
RX-UpPTSBe the reception initial time of the uplink pilot time slot of this Home eNodeB, T
RX-DwPTSReception initial time for the descending pilot frequency time slot of this Home eNodeB.
4. method according to claim 2, is characterized in that, described Home eNodeB is synchronizeed with described macro base station according to described propagation delay to adjust and comprised: the transmission initial time of the uplink pilot time slot of described this Home eNodeB of Home eNodeB is set to T
TX-DwPTS=T
RX-DwPTS-T_delay, wherein, T
RX-DwPTSReception initial time for the descending pilot frequency time slot of this Home eNodeB.
5. a Home eNodeB, is characterized in that, comprising:
The time delay determination module is used for determining the propagation delay between described Home eNodeB and macro base station when described Home eNodeB powers on first;
Time delay is preserved module, is used for the described propagation delay that the time delay determination module is determined is kept at described Home eNodeB;
Synchronous adjusting module is used for synchronizeing with described macro base station according to the described propagation delay that the time delay determination module is determined adjusting; And be used for when described Home eNodeB powers on again, the described propagation delay of having preserved in described Home eNodeB according to time delay preservation module is synchronizeed with described macro base station and is adjusted.
6. Home eNodeB according to claim 5, is characterized in that, described time delay determination module comprises:
Lower start of line determining unit is used for when described Home eNodeB receives the down-bound pilot frequency signal that comes from described macro base station, and the reception initial time of determining the descending pilot frequency time slot of this Home eNodeB is T
RX-DwPTS
Up initial calculation unit is used for estimating to obtain estimation time delay t by path loss
p, and calculate the transmission initial time T of the uplink pilot time slot of this Home eNodeB
TX-UpPTS=T
RX-DwPTS-2t
p+ 12 * 16T
C
The ascending pilot frequency transmitting element is used for the T that obtains at above start of line computing unit
TX-UpPTSFor sending uplink pilot signal to described macro base station in the uplink pilot time slot that sends initial time;
The propagation delay computing unit is used for according to UpPTS
POSCalculating described propagation delay is T_delay=(UpPTS
ADV+ UpPTS
POS-8 * 16T
C)/2, wherein, UpPTS
ADV=2t
p, UpPTS
POSStarting position for the uplink pilot time slot of the described Home eNodeB that calculated according to described uplink pilot signal by described macro base station.
7. Home eNodeB according to claim 6, is characterized in that, described synchronous adjusting module comprises:
The ascending pilot frequency setting unit, the transmission initial time that is used for the uplink pilot time slot of this described Home eNodeB is set to T
TX-UpPTS=T
RX-UpPTS-2 * T_delay, wherein, T
RX-UpPTSReception initial time for the uplink pilot time slot of this Home eNodeB;
The descending pilot frequency setting unit, the transmission initial time that is used for the descending pilot frequency time slot of described Home eNodeB is set to T
TX-DwPTS=T
RX-DwPTS-2 * T_delay, wherein, T
RX-DwPTSReception initial time for the descending pilot frequency time slot of this Home eNodeB.
8. Home eNodeB according to claim 6, it is characterized in that, the transmission initial time that described synchronous adjusting module is used for the uplink pilot time slot of described Home eNodeB is set to TTX-DwPTS=TRX-DwPTS-T_delay, wherein, TRX-DwPTS is the reception initial time of the descending pilot frequency time slot of this Home eNodeB.
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| CN2011103394035A CN103096454A (en) | 2011-11-01 | 2011-11-01 | Synchronized method of household base station and macro base station and household base station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296023A (en) * | 2007-04-28 | 2008-10-29 | 中兴通讯股份有限公司 | Uplink Synchronization method for fixed terminal in mobile communication system |
| CN101754351A (en) * | 2008-12-05 | 2010-06-23 | 大唐移动通信设备有限公司 | Method, system and apparatus for synchronization of home base station |
| CN101873688A (en) * | 2009-04-22 | 2010-10-27 | 鼎桥通信技术有限公司 | Synchronization method of femtocell and macrocell and access method of user equipment |
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2011
- 2011-11-01 CN CN2011103394035A patent/CN103096454A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296023A (en) * | 2007-04-28 | 2008-10-29 | 中兴通讯股份有限公司 | Uplink Synchronization method for fixed terminal in mobile communication system |
| CN101754351A (en) * | 2008-12-05 | 2010-06-23 | 大唐移动通信设备有限公司 | Method, system and apparatus for synchronization of home base station |
| CN101873688A (en) * | 2009-04-22 | 2010-10-27 | 鼎桥通信技术有限公司 | Synchronization method of femtocell and macrocell and access method of user equipment |
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Application publication date: 20130508 |