CN100426704C - Method for ralizing synchronization in TDD radio communication system - Google Patents
Method for ralizing synchronization in TDD radio communication system Download PDFInfo
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- CN100426704C CN100426704C CNB02120974XA CN02120974A CN100426704C CN 100426704 C CN100426704 C CN 100426704C CN B02120974X A CNB02120974X A CN B02120974XA CN 02120974 A CN02120974 A CN 02120974A CN 100426704 C CN100426704 C CN 100426704C
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Abstract
The present invention relates to a method for realizing synchronization in a TDD (Time Division Duplex) radio communication system. After the method establishes unlink synchronization and downlink synchronization on UE (User Equipment), the method does not maintain the uplink synchronization any more according to a closed loop mode that the UE submits an intermediate pilot frequency and a base station issues a timing adjustment signaling. However, through the processing of a downlink public pilot frequency by the UE, the method self carries out timing adjustment according to the timing variation of the downlink public pilot frequency, and adjustment effect can be always accumulated. When the UE has an uplink transmission requirement, uplink transmission timing can be adjusted correspondingly according to a known uplink and downlink timing relationship and an accumulated value of a current downlink timing adjustment quantity. Thereby, under the condition that the UE can not obtain special physical channels which are continuous distributed and can be used for the closed loop timing adjustment, the present invention can maintain an uplink synchronization relationship and restore uplink data transmission in time. Compared with the existing closed loop synchronization, the method has the advantages of simple and reliable maintenance and realization and is especially suitable for the TDD system which is special for optimizing the transmission of data services.
Description
Technical field
The present invention relates to wireless communication technology field, relates in particular to the synchronous method of realization in a kind of TDD radio communication system.
Background technology
Along with the fast development of wireless communication technology, limited available radio spectrum can't satisfy the wireless messages transmission requirements that is exponential increase.For this reason, people also become more and more urgent to the demand of the new technology that can increase wireless communication system transmission information capability.The TDD that arises at the historic moment (time division duplex) technology just can solve the problem of raising up-downgoing non-symmetrical service efficiency of transmission wherein effectively, the TDD transmission technology is meant that can take the different time periods respectively for uplink and downlink information in same section frequency spectrum transmits, this just requires the air interface of TDD wireless communication system must realize good down-going synchronous and uplink synchronous, otherwise will cause the interference of internal system, reduce power system capacity.
The arrowband TDD standard of third generation radio communication, be TD-SCDMA (TD SDMA) system subframe structure of time slot as shown in Figure 1, the subframe of TD-SCDMA is fixed as 5ms, marked the channel that is used to realize three synchronous special time slot correspondences: DwPCH (downlink pilot frequency channel) among the figure, GP (Guard Period, the protection period), UpPCH (ascending pilot channel); 7 remaining business time-slots all are that 0.675ms is long, can realize the flexible allocation of up-downgoing business time-slot by the up-downgoing switching point is set.
At the TD-SCDMA system with said system subframe, it is synchronous to adopt following method for synchronous to carry out uplink and downlink at present:
(1) UE (User Equipment, subscriber equipment) start is set up down-going synchronous by receiving broadcast channel;
(2) after down-going synchronous is set up, just begin to set up uplink synchronous, the foundation of uplink synchronous is to realize by the random access procedure that UE initiates:
After down-going synchronous is set up, UE does not still know and base station (Node B) between distance, can not realize uplink synchronous accurately, therefore for reducing the interference to business time-slot, UE sends initial up sequence in the time period of UpPCH, i.e. the uplink synchronous exploration sequence; After the base station detects this sequence, estimate the upstream synchronous timing deviation, and notice UE, UE adjusts up emission regularly according to this value.Specific practice is: UE estimates the propagation delay δ t that is caused by path loss according to the power of received P-CCPCH (Primary Common ControlPhysical Channel, first Common Control Channel) and/or DwPCH
p, the x time T of UpPCH then
TX-UpPCHFor:
T
TX-UpPCH＝T
RX-DwPCH-2δt
p+12＊16T
C
And get the integral multiple of 1/8 chip, wherein
T
TX-UpPCHFor regularly according to the UE side, the initial moment that UpPCH sends;
T
RX-DwPCHFor regularly according to the UE side, the initial moment that DwPCH receives;
2 δ t
pIt is the Timing Advance of UpPCH;
12*16T
CBeing DwPCH Timing Advance than UpPCH in frame structure, referring to Fig. 1, is 192 chips.
After the base station detects this sequence, estimate upstream synchronous timing deviate U
pPCH
POS, and on the channel of descending correspondence, inform UE with the precision of 1/8 chip, the length of 11 bits, the ensuing up emission of UE is adjusted according to this value.
(3) after uplink synchronous is set up, be the maintenance process of uplink synchronous, keeping by the closed loop timing controlled of uplink synchronous obtains.
Timing estimation is carried out to middle the pilot tone of uplink UE emission in the base station, and issues timing in the SS of DPCH (DedicatedPhysical Channel DPCH) (Synchronisation Shift simultaneous bias) field to UE and adjust signaling.
(4) behind uplink loss, then get back to (2) and set up uplink synchronous with open loop approach again.
The structure of time slot schematic diagram of TD-SCDMA as shown in Figure 2.TD-SCDMA supports that in each time slot a plurality of users adopt CDMA (code division multiple access), also supports the TDMA (time division multiple access) of different user between a plurality of time slots." signal data " part shown in Figure 2 has been carried certain user's DPCH data, and " middle pilot tone " part is corresponding to this user's middle pilot frequency sequence.Therefore pilot tone must be corresponding with the DPCH channel in the middle of.
The position of SS field is as shown in Figure 3 in the descending time slot structure among the TD-SCDMA.This fields account of TD-SCDMA technology regulation and stipulation is with the position of signal data, and in the middle of following closely after the pilot tone, so the SS symbol takies is one section resource on the DPCH channel.
By the synchronous maintenance process of TD-SCDMA and keep synchronously required last interline pilot tone and descending SS field as can be known, a precondition keeping uplink synchronous is: for this UE, must have the DPCH DPCH of uplink and downlink simultaneously; The middle pilot tone of up DPCH correspondence is used for the base station measurement of channel delay is estimated that the SS signaling of carrying on the descending DPCH channel is used for the synchronous adjustment of indicating terminal.
In present communication service, data service has demonstrated strong demand, and with dominate.Compare with existing speech business in the communication system, Internet is browsed such data service and had following different characteristics: have suddenly, and the user has the requirement of " always online "; Be that up-downgoing is asymmetrical; Requirement to time of delay does not have speech business strictness etc. so.Therefore, at data service,, be to waste of radio resources under the situation mostly for each UE distributes the DPCH resource of uplink and downlink simultaneously.In addition, a HSDPA who is formulating (High Speed Downlink Packet Access, high-speed downstream bag access technology) technical standard, by adopting substantially invariable transmitting power, radio propagation channel condition at different UEs, use different coded modulation schemes and realize the raising of system spectral efficiency, this link adaptation techniques requires as much as possible Radio Resource by sharing between many UE and according to the channel condition comparison of each UE and flexible dispatching is distributed, rather than the form of UE dedicated channel.
Therefore, the existing technical scheme of keeping synchronously realizes and can not well be applied to the optimization of Packet data service in the TDD system owing to requiring the existence of uplink and downlink DPCH simultaneously.For example, when a UE is not assigned to downward special physical channel in some frames, just may be owing to having lost the resource of keeping synchronously, and transfer desynchronizing state to by the synchronous regime accumulative total of having set up.When the base station can provide when service for this UE, its process of having to set up synchronously again causes the waste to random access resource.
In sum, the contradiction between the existing desired DPCH resource of simultaneous techniques and the desired Channel Sharing of data service, the flexible dispatching makes that communication system is that the optimization of data traffic transmission is difficult to realization.
Summary of the invention
The purpose of this invention is to provide the synchronous method of realization in a kind of TDD radio communication system, utilize the down public guide frequency channel to be implemented in to set up the uplink synchronous after the uplink synchronous to keep, can make the uplink synchronisation method that data traffic transmission optimization is achieved in the wireless communication system thereby provide a kind of.
The object of the present invention is achieved like this: realize in the TDD radio communication system comprising synchronous method:
A, subscriber equipment are set up down-going synchronous by the broadcast channel that receives base station;
B, subscriber equipment send information to the base station, and the information that send according to subscriber equipment the base station is determined the up emission timing adjustment amount that subscriber equipment need carry out, and notifying user equipment; Subscriber equipment carries out up emission according to up emission timing adjustment amount regularly to be adjusted, and sets up uplink synchronous;
C, subscriber equipment carry out tracking measurement by every frame to the timing variation of down public guide frequency channel, and utilize this regularly to change the up x time that obtains before the transmission gap is revised, the correction result accumulation, the result that the above-mentioned up x time that obtains is revised accumulation realizes keeping of uplink synchronous as current up launch time.
Described step a comprises:
The broadcast transmission of the known data sequence of each subscriber equipment is carried out in a1, base station;
The fixed-site of given data sequence in frame structure, and periodic continuing occurs on down link;
A2, subscriber equipment pass through the reception of given data sequence and handle the reception that reaches the downlink broadcast channel, set up down-going synchronous.
Described step b comprises:
B1, subscriber equipment be according to down receiving signal power estimating path loss, and according to path loss estimated path time delay;
B2, according to calculating up initial transmissions the path delay of time constantly, and emission uplink detection sequence;
B3, base station are by calculating the detected uplink detection sequence moment and base station deviation regularly;
B4, with the deviation calculated as up emission regularly adjustment amount carry out up emission timing adjustment by the down channel notifying user equipment, set up uplink synchronous.
Described step c comprises:
C1, when entering transmission gap, subscriber equipment changes the timing of down public guide frequency channel at every frame and carries out tracking measurement, and utilizes this regularly to change the up x time that obtains before the transmission gap is revised, the accumulation correction result; Described transmission gap is after subscriber equipment is set up uplink synchronous, and each does not have to be the time period of this user equipment allocation dedicated radio resources;
C2, when needs carry out up emission, with the correction result of above-mentioned accumulation as current up launch time.
Described step c1 comprises:
Up launch time of the T that c11, record obtain before the transmission gap
TX-UL(O);
The descending time of reception T of c12, each frame of down public guide frequency channel in the measurement transmission gap time period
RX-DL(i);
I: the frame number sign of transmission gap, the frame number in 1≤i≤transmission gap time period;
C13, calculate the change amount δ of down public guide frequency channel consecutive frame time of reception successively
RX-DL(i), i.e. δ
RX-DL(i)=T
RX-DL(i)-T
RX-DL(i-1), and in real time calculate current up launch time of the T of the i frame correspondence of descending pilot frequency
TX-UL(i), T
TX-UL(i)=T
TX-UL(i-1)-δ
RX-DL(i).
Described step c2 comprises:
C21, determine that subscriber equipment need carry out up emission, and be assigned with wireless communication resources;
C22, will be by final current up launch time of the T that obtains of accumulation corrected Calculation
TX-UL(i) as up launch time.
Realize synchronous method in the another kind of TDD radio communication system provided by the invention, comprising:
D, subscriber equipment are set up down-going synchronous by the broadcast channel that receives base station;
E, subscriber equipment send information to the base station, and the information that send according to subscriber equipment the base station is determined the up emission timing adjustment amount that subscriber equipment need carry out, and notifying user equipment; Subscriber equipment carries out up emission according to up emission timing adjustment amount regularly to be adjusted, and sets up uplink synchronous;
F: judge whether subscriber equipment has been assigned with dedicated radio resources;
G: if subscriber equipment has been assigned with dedicated radio resources, then subscriber equipment carries out keeping of uplink synchronous by utilizing dedicated radio resources and inter base station communication;
H: if subscriber equipment is not assigned with dedicated radio resources, then the mensuration by down public guide frequency channel in the wireless communication system is regularly changed to adjusting up launch time, realizes keeping of uplink synchronous.
Described step g comprises:
The dedicated radio resources that g1, subscriber equipment utilization distribute is to base station ascending pilot frequency information;
G2, base station calculate the uplink synchronous deviation by reception and the processing to ascending pilot frequency information;
G3, with the downlink dedicated Radio Resource notifying user equipment of this uplink synchronous deviation by this subscriber equipment;
G4, subscriber equipment carry out timing adjustment according to the uplink synchronous departure that receives, and realize keeping of uplink synchronous.
Described step h comprises:
H1, when entering transmission gap, subscriber equipment changes the timing of down public guide frequency channel by every frame and carries out tracking measurement, and utilizes this regularly to change the up x time that obtains before the transmission gap is revised, the correction result accumulation; Wherein, transmission gap is after subscriber equipment is set up uplink synchronous, and each does not have to distribute for it time period of dedicated radio resources;
H2, when needs carry out up emission, with the above-mentioned result of accumulation that the up x time that obtains before the transmission gap is revised as current up launch time.
The content of transmitting on the described dedicated radio resources is at this unique user equipment.
By technique scheme as can be seen, technical solution of the present invention has been used the shared same frequency range of up-downgoing in the TDD radio communication system, up with descending identical characteristic of time in path delay, pilot tone, base station issue the closed-loop fashion of regularly adjusting signaling and keep uplink synchronous in the middle of no longer uploading according to UE, but handle the down public guide frequency signal by UE, timing according to down public guide frequency changes, and makes voluntarily regularly and adjusting, and adjust effect and accumulate always.When UE has up transmission demand, can adjust corresponding up emission regularly according to the accumulated value of known up-downgoing timing relationship and current descending timing adjustment amount.
Therefore, the present invention can not get keeping the uplink synchronous relation at any time under the situation that can be used for the DPCH that closed loop regularly adjusts of continuous dispensing at UE, in time recovers uplink.Compare with the synchronous Concept of Maintenance of existing TD-SCDMA, the present invention has the following advantages: increased a kind of method of keeping synchronously, it is simple and reliable that this method is kept realization synchronously than existing closed loop; Do not rely on the distribution of the DPCH resource of additional allocation, only need public resource can realize keeping synchronously, save resource than existing synchronization scenario, adaptability is strong; Be particularly useful for specially the TDD system that optimizes for data traffic transmission.
Description of drawings
Fig. 1 is the structure of time slot schematic diagram A of TD-SCDMA system;
Fig. 2 is the structure of time slot schematic diagram B of TD-SCDMA system;
Fig. 3 is the structure of time slot schematic diagram C of TD-SCDMA system;
Fig. 4 is concrete implementing procedure figure of the present invention.
Embodiment
The invention provides the air interface physical layer method for synchronous in a kind of TDD radio communication system, its specific implementation process as shown in Figure 4:
Step 1: for the TDD system, obtaining down-going synchronous is the prerequisite of uplink synchronous.
In the TDD system, necessarily there is the broadcast transmission of the known data sequence of some receiving terminals in down link, the fixed-site of these known arrays in frame structure, content be not at certain or certain several UE but be that each UE is in common knowledge, and periodic continuing occurs on down link.Among the present invention these known arrays are called down public guide frequency.To the reception and the processing of public guide frequency, and then to the reception of downlink broadcast channel, it is synchronous to obtain reliable down by at first for UE.
This step is identical with the principle process of the down-going synchronous of TD-SCDMA system realization at present.
Step 2: after obtaining down-going synchronous, just can set up uplink synchronous with open loop approach.
UE comes the estimated path time delay according to down receiving signal power by estimating path loss, and adopts and calculate up initial transmissions the path delay of time of estimating constantly, emission uplink detection sequence.The base station detects this uplink detection sequence, receives the moment of detection sequence and the deviation of base station timing itself by calculating, informs the regularly adjustment of up emission that UE should carry out at the channel of descending correspondence.At this time, no matter whether next up have a data transmission, UE has been known current and the up accurate timing base station.
This step is identical with the principle process of the uplink synchronous of TD-SCDMA system realization at present.
Set up uplink and downlink synchronously after, be the maintenance process of uplink synchronous, keeping of uplink synchronous can have two kinds of processing methods according to different situations.
Step 3: judged whether to user equipment allocation dedicated radio resources,, adopted closed loop to keep mode synchronously, otherwise execution in step 8 adopts half-blindness to keep mode synchronously if then execution in step 4;
Wherein, closed loop keeps synchronously that to keep principle identical with the uplink synchronous of TD-SCDMA system prior art; It is that the new uplink synchronous based on the TDD system that the present invention proposes is kept method that half-blindness is kept synchronously.
Step 4: determine that UE need carry out the upstream data emission, and be assigned with dedicated radio resources; When UE takies this part Radio Resource emission upstream data, with of the emission of a part of resource as the information data of base station the unknown; Another part resource is as the emission of the data sequence of known its position in frame structure, base station and content, and this given data sequence is called ascending pilot frequency;
Described dedicated radio resources is meant the content of transmitting on this Radio Resource at single UE, rather than is shared by a plurality of UE;
Step 5: the base station calculates the uplink synchronous deviation by reception and processing to ascending pilot frequency;
Step 6: the downlink dedicated Radio Resource of deviation by this UE is notified to this UE;
Step 7:UE carries out the timing adjustment of up launch time according to the synchronism deviation amount of being received, to realize keeping of uplink synchronous.
Step 8: determine that UE is not assigned to dedicated radio resources, enters the transmission gap time period;
The transmission gap time period is: the result synchronous according to step 2 open loop, and UE has set up uplink synchronous, but can not continue to carry out ascending pilot frequency transmission or down-going synchronous deviation notice owing to be not assigned with dedicated radio resources;
Step 9: during the transmission gap, UE carries out tracking measurement by every frame to the timing variation of down public guide frequency channel, and this descending timing is changed accumulation;
This step is formulated as follows:
T
TX-UL(i)=T
TX-UL(i-1) δ
RX-DL(i)
Wherein,
δ
RX-DL(i)=T
RX-DL(i)-T
RX-DL(i-1) for a change measure δ when the change amount is retardation
RX-DL(i) be on the occasion of, δ when the change amount is lead
RX-DL(i) be negative value;
T
TX-UL(O) the up benchmark x time that obtains for the former frame that enters transmission gap;
I: the frame number sign of transmission gap, the frame number in 1≤i≤transmission gap;
T
RX-DL(i): the down public guide frequency that the i frame obtains receives the descending reception timing reference moment that obtains
Step 10: when subscriber equipment need carry out the upstream data emission, this accumulative effect is used for obtaining current up launch time to entering the correction of the up x time that has obtained before the transmission gap;
Because after uplink synchronous was set up, in the identical time period, the Timing Advance that the reception of down public guide frequency is obtained was exactly the constant time lag amount of up emission, vice versa; So under the condition that the shortage closed loop is kept, can realize keeping of uplink synchronous equally.
If when detecting uplink loss in the maintenance process synchronously, the uplink synchronous that then comes back to step 2 is set up process.
The described half-blindness of the present invention program is kept synchronously, not only can be used to lack the situation of up-downgoing dedicated radio resources, under the situation that the up-downgoing dedicated radio resources is all possessed, also can be suitable for, be that alternative existing closed loop is kept method synchronously, to save the processing of part, reach the emission of timing slip signaling to last interline pilot tone.In addition, UE transfers the state that regains dedicated radio resources to by the transmission gap state, then can continue to adopt closed loop to keep mode synchronously, and the timing results during half-blindness is kept is proofreaied and correct.
Claims (9)
1, realize synchronous method in a kind of TDD radio communication system, comprising:
A, subscriber equipment are set up down-going synchronous by the broadcast channel that receives base station;
B, subscriber equipment send information to the base station, and the information that send according to subscriber equipment the base station is determined the up emission timing adjustment amount that subscriber equipment need carry out, and notifying user equipment; Subscriber equipment carries out up emission according to up emission timing adjustment amount regularly to be adjusted, and sets up uplink synchronous;
C, subscriber equipment change by the timing to the down public guide frequency channel and carry out tracking measurement, and utilize this regularly to change up x time is revised, and the accumulation correction result utilizes the result of accumulation to realize keeping of uplink synchronous.
2, realize synchronous method in the TDD radio communication system according to claim 1, it is characterized in that described step a comprises:
The broadcast transmission of the known data sequence of each subscriber equipment is carried out in a1, base station;
The fixed-site of given data sequence in frame structure, and periodic continuing occurs on down link;
A2, subscriber equipment pass through the reception of given data sequence and handle the reception that reaches the downlink broadcast channel, set up down-going synchronous.
3, realize synchronous method in the TDD radio communication system according to claim 1, it is characterized in that described step b comprises:
B1, subscriber equipment be according to down receiving signal power estimating path loss, and according to path loss estimated path time delay;
B2, according to calculating up initial transmissions the path delay of time constantly, and emission uplink detection sequence;
B3, base station are by calculating the detected uplink detection sequence moment and base station deviation regularly;
B4, with the deviation calculated as up emission regularly adjustment amount carry out up emission timing adjustment by the down channel notifying user equipment, set up uplink synchronous.
4, synchronous method it is characterized in that described step c comprises according to realizing in claim 1, the 2 or 3 described TDD radio communication system:
C1, when entering transmission gap, subscriber equipment changes the timing of down public guide frequency channel at every frame and carries out tracking measurement, and utilizes this regularly to change the up x time that obtains before the transmission gap is revised, the accumulation correction result; Described transmission gap is after subscriber equipment is set up uplink synchronous, and each does not have to be the time period of this user equipment allocation dedicated radio resources;
C2, when needs carry out up emission, with the correction result of above-mentioned accumulation as current up launch time.
5, realize synchronous method in the TDD radio communication system according to claim 4, it is characterized in that described step c1 comprises:
Up launch time of the T that c11, record obtain before the transmission gap
TX-UL(0);
The descending time of reception T of c12, each frame of down public guide frequency channel in the measurement transmission gap time period
RX-DL(i);
I: the frame number sign of transmission gap, the frame number in 1≤i≤transmission gap time period;
C13, calculate the change amount δ of down public guide frequency channel consecutive frame time of reception successively
RX-DL(i), i.e. δ
RX-DL(i)=T
RX-DL(i)-δ
RX-DL(i-1), and in real time calculate current up launch time of the T of the i frame correspondence of descending pilot frequency
TX-UL(i), T TX-UL (i)=T
TX-UL(i-1)-δ
RX-DL(i).
6, realize synchronous method in the TDD radio communication system according to claim 4, it is characterized in that described step c2 comprises:
C21, determine that subscriber equipment need carry out up emission, and be assigned with wireless communication resources;
C22, will be by final current up launch time of the T that obtains of accumulation corrected Calculation
TX-UL(i) as up launch time.
7, realize synchronous method in a kind of TDD radio communication system, comprising:
D, subscriber equipment are set up down-going synchronous by the broadcast channel that receives base station;
E, subscriber equipment send information to the base station, and the information that send according to subscriber equipment the base station is determined the up emission timing adjustment amount that subscriber equipment need carry out, and notifying user equipment; Subscriber equipment carries out up emission according to up emission timing adjustment amount regularly to be adjusted, and sets up uplink synchronous;
F: judge whether subscriber equipment has been assigned with dedicated radio resources;
G: if subscriber equipment has been assigned with dedicated radio resources, then subscriber equipment carries out keeping of uplink synchronous by utilizing dedicated radio resources and inter base station communication;
H: if subscriber equipment is not assigned with dedicated radio resources, then the mensuration by down public guide frequency channel in the wireless communication system is regularly changed to adjusting up launch time, realizes keeping of uplink synchronous.
8, realize synchronous method in the TDD radio communication system according to claim 7, described step g comprises:
The dedicated radio resources that g1, subscriber equipment utilization distribute is to base station ascending pilot frequency information;
G2, base station calculate the uplink synchronous deviation by reception and the processing to ascending pilot frequency information;
G3, with the downlink dedicated Radio Resource notifying user equipment of this uplink synchronous deviation by this subscriber equipment;
G4, subscriber equipment carry out timing adjustment according to the uplink synchronous departure that receives, and realize keeping of uplink synchronous.
9, realize synchronous method in the TDD radio communication system according to claim 8, it is characterized in that the content transmitted on the described dedicated radio resources is at this unique user equipment.
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| US5809397A (en) * | 1996-02-29 | 1998-09-15 | Motorola, Inc. | Method and apparatus for system synchronization in a messaging system |
| JP2001257641A (en) * | 2000-02-11 | 2001-09-21 | Lucent Technol Inc | Uplink timing synchronization and access control for multi-access wireless communication system |
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2002
- 2002-06-06 CN CNB02120974XA patent/CN100426704C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5809397A (en) * | 1996-02-29 | 1998-09-15 | Motorola, Inc. | Method and apparatus for system synchronization in a messaging system |
| JP2001257641A (en) * | 2000-02-11 | 2001-09-21 | Lucent Technol Inc | Uplink timing synchronization and access control for multi-access wireless communication system |
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