CN101527595B - Frame structure of time division duplex system and method for sending synchronous signals - Google Patents
Frame structure of time division duplex system and method for sending synchronous signals Download PDFInfo
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Abstract
The invention provides a frame structure of a time division duplex system and a method for sending synchronous signals. The method comprises that: a base station sends a main synchronous signal and an auxiliary synchronous signal on last two orthogonal frequency division multiplexing signals of a same downlink time slot of each half frame respectively, and the time slot is different from the time slot for sending the main synchronous signal and the auxiliary synchronous signal in a frequency division duplex system; and the base station also sends a main physical broadcast channel of system broadcast information on continuous multiple orthogonal frequency division multiplexing signals of a downlink time slot of any half frame of the half frame, and the time slot of the main physical broadcast channel for sending the system broadcast information is on a same subframe as the time slot for sending the main synchronous signal and the auxiliary synchronous signal in the half frame. By using the frame structure and the method, under the condition that a double-mode terminal detects out a duplex mode in advance, the search performance of a cell can be improved; and according to the size of a time domain interval from the synchronous signals to the physical broadcast channel, the method can easily help the double-mode terminal to detect the duplex mode.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to a kind of sending method of synchronization signal of time-division duplex system.
Background technology
The frame structure of present the 3rd third-generation mobile communication time division duplex (Time Divided Duplex, TDD) long evolving system (Long-Term Evolution, LTE), as shown in Figure 1.In this frame structure, the radio frames of a 10ms is divided into two fields, it is the 0.5ms time slot that each field is divided into 10 length, per two time slots form the subframe that length is 1ms, comprise 10 subframes (numbering from 0 to 9) in the radio frames, comprise 20 time slots (numbering from 0 to 19) in the radio frames.Be regular circulation prefix (the Cyclic Prefix of 5.21us and 4.69us for length, CP), the up/down row symbol that it is 66.7us that time slot comprises 7 length, wherein first symbol cyclic prefix length is 5.21us, the circulating prefix-length of all the other 6 symbols is 4.69us, shown in Fig. 1 bottom is divided; Be the extended cyclic prefix of 16.67us for length, a time slot comprises 6 up/down row symbols.In addition, this frame structure also comprises following characteristics:
First subframe and the 6th subframe are fixed for downlink transfer;
Support that 5ms and 10ms are the up-downgoing conversion of assignment period;
Subframe 1 and subframe 6 are special subframe, comprise 3 special time slots, are designated respectively DwPTS (descending pilot frequency time slot), GP (protection interval) and UpPTS (uplink pilot time slot), wherein,
DwPTS is used for downlink transfer;
GP is guard time, does not transmit any data;
UpPTS is used for uplink, can be used for transmitting physical random access channel PRACH (PhysicalRandom Access Channel) and sounding reference symbol SRS (Sounding Reference symbol).
Master sync signal PSS (Primary-Synchronization Signal) sends at primary synchronization channel P-SCH (Primary-Synchronization Channel), P-SCH is arranged on the 3rd OFDM (OFDM) symbol of DwPTS, takies middle 1.25MHz on this symbol frequency domain; Auxiliary synchronous signals SSS (Secondary-Synchronization Signal) sends at auxiliary synchronization channel S-SCH (Secondary-Synchronization), and S-SCH is positioned at last the OFDM symbol on time slot 1 and the time slot 11, takies middle 1.25MHz on this symbol frequency domain.
For LTE TDD system, adopt master sync signal to send at the 3rd the OFDM symbol of DwPTS, so that auxiliary synchronous signal is far away apart from primary synchronization channel, the centre differs 2 OFDM symbols, and LTE FDD (Frequency divided duplex: Frequency Division Duplexing (FDD)) synchronizing signal of system sends as shown in Figure 2, auxiliary synchronous signal is only by master sync signal, latter two OFDM symbol at first time slot of subframe #0 and subframe # 5 sends, namely time slot #0 and time slot #10's sends on latter two OFDM symbol, reference signal when master sync signal can be used as the auxiliary synchronous signal detection like this improves the Cell searching performance greatly.Therefore, relative LTE FDD system, the performance of the Cell searching of LTETDD is lower.In addition, master sync signal sends the design that also can affect LTE TDD system descending control signal at the 3rd the OFDM symbol of DwPTS, LTE system regulation control signal can be at front 1 of descending sub frame, send on 2 or 3 OFDM symbols, but for DwPTS, agreement have to be defined on its front 1 or 2 OFDM symbol and to send descending control signaling avoiding and the primary synchronization channel conflict, and this may form descending covering power and not mate and will increase the complexity that control signal sends.Certainly, LTE TDD system adopts master sync signal can bring the benefit that detects in advance duplex mode in the 3rd the OFDM symbol transmission of DwPTS, namely for the TDD/FDD dual-mode terminal, just can know that in cell search process this residential quarter is TDD residential quarter or FDD residential quarter.Therefore, detect in advance under the prerequisite of duplex mode in maintenance, in order to improve the Cell searching performance of LTE TDD system, the aspects such as simultaneously retentive control Signalling Designing keep highly consistent with LTE FDD system, and the synchronizing signal of LTE TDD system sends and still is necessary to be optimized at present.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of sending method of synchronization signal of time-division duplex system, guaranteeing that dual-mode terminal detects under the prerequisite of duplex mode in advance, can improve the search performance of tdd systems small area.
In order to address the above problem, the invention provides a kind of sending method of synchronization signal of time-division duplex system, comprising:
The base station sends respectively master sync signal and auxiliary synchronous signal on latter two OFDM symbol of the same descending time slot of each field, the time slot that sends master sync signal and auxiliary synchronous signal in described time slot and the frequency division duplex system is different time-gap;
The base station is the primary physical broadcast channel of transmitting system broadcast on continuous a plurality of OFDM symbols of a descending time slot of arbitrary field of described field also, sends the time slot of master sync signal and auxiliary synchronous signal in the time slot of the primary physical broadcast channel of described transmitting system broadcast and this time slot place field on same subframe.
Further, described base station sends respectively master sync signal on latter two OFDM symbol of the same descending time slot of each field and auxiliary synchronous signal refers to, the base station sends master sync signal at last OFDM symbol of a descending time slot of described each field, penultimate OFDM symbol at described descending time slot sends auxiliary synchronous signal, and described each field is divided into five subframes.
Further, the base station on front 4 OFDM symbols of second time slot of first subframe or last 4 OFDM symbols of first time slot of first subframe send the primary physical broadcast channel of described system broadcast message;
The base station sends master sync signal at last OFDM symbol of second time slot of second time slot of first subframe and the 6th subframe, sends auxiliary synchronous signal at the penultimate OFDM symbol of second time slot of second time slot of first subframe and the 6th subframe.
Further, the base station on front 4 OFDM symbols of second time slot of the 6th subframe or last 4 OFDM symbols of first time slot of the 6th subframe send the primary physical broadcast channel of described system broadcast message;
The base station sends master sync signal at last OFDM symbol of second time slot of second time slot of first subframe and the 6th subframe, sends auxiliary synchronous signal at the penultimate OFDM symbol of second time slot of second time slot of first subframe and the 6th subframe.
The present invention also provides a kind of frame structure of tdd systems, and each field of a radio frames is divided into 10 isometric time slots, and per two time slots form a subframe, it is characterized in that:
Latter two OFDM symbol of the same descending time slot of described each field is respectively applied to carry master sync signal and auxiliary synchronous signal, and the time slot of carrying master sync signal and auxiliary synchronous signal is different time-gap in described time slot and the frequency division duplex system;
Continuous a plurality of OFDM symbols of one descending time slot of arbitrary field of described field are used for the primary physical broadcast channel of bearing system broadcast; The time slot of carrying master sync signal and auxiliary synchronous signal is on same subframe in the time slot of the primary physical broadcast channel of described bearing system broadcast and this time slot place field.
Further, latter two OFDM symbol of the same descending time slot of described each field is respectively applied to carry master sync signal and auxiliary synchronous signal refers to, last OFDM symbol of one descending time slot of described each field is used for the carrying master sync signal, and the penultimate OFDM symbol of described descending time slot is used for the carrying auxiliary synchronous signal.
Further, last 4 OFDM symbols of first time slot of front 4 OFDM symbols of second of first subframe time slot or first subframe are used for the primary physical broadcast channel of bearing system broadcast;
Last OFDM symbol of second time slot of first subframe and second time slot of the 6th subframe is used for carrying described master sync signal;
The penultimate OFDM symbol of second time slot of first subframe and second time slot of the 6th subframe is used for carrying described auxiliary synchronous signal.
Further, last 4 OFDM symbols of first time slot of front 4 OFDM symbols of second time slot of the 6th subframe or the 6th subframe are used for carrying the primary physical broadcast channel of described system broadcast message;
Last OFDM symbol of second time slot of first subframe and second time slot of the 6th subframe is used for carrying described master sync signal;
The penultimate OFDM symbol of second time slot of first subframe and second time slot of the 6th subframe is used for carrying described auxiliary synchronous signal.
In sum, the invention provides a kind of frame structure of tdd systems and the sending method of synchronizing signal, because master sync signal and auxiliary synchronization channel are positioned on the adjacent OFDM symbol of same time slot, can improve the Cell searching performance; And for not impact of the transmissions such as the control signal among the DwPTS, thereby can reduce system complexity.Moreover the time domain interval of the synchronizing signal of TDD system from the synchronizing signal of the time domain interval of Physical Broadcast Channel and FDD system from Physical Broadcast Channel varies in size, and can help easily dual-mode terminal to detect duplex mode.
Description of drawings
Fig. 1 is the schematic diagram that LTE TDD system synchronization signal sends in the prior art;
Fig. 2 is the schematic diagram that LTE FDD system synchronization signal sends in the prior art;
Fig. 3 is the embodiment that LTE TDD system synchronization signal of the present invention sends.
Embodiment
The invention provides a kind of frame structure of tdd systems, as shown in Figure 3, the radio frames of a 10ms is divided into two fields, the time slot that it is 0.5ms that each field is divided into 10 length, two time slots form the subframe that length is 1ms, namely comprise 10 subframes (numbering from 0 to 9) in a radio frames, comprise 20 time slots (numbering from 0 to 19) in the radio frames.When adopting the regular circulation prefix, each subframe comprises 14 OFDM symbols.
Latter two OFDM symbol of the same descending time slot of each field is respectively applied to carry master sync signal and auxiliary synchronous signal, wherein continuous a plurality of OFDM symbols of a descending time slot of arbitrary field are used for the primary physical broadcast channel P-BCH of bearing system broadcast, herein a plurality of can but to be not limited to be 4; The time slot of carrying master sync signal and auxiliary synchronous signal is on same subframe in the time slot of carrying P-BCH and this time slot place field.And the time slot of carrying master sync signal and auxiliary synchronous signal is different time-gap in the time slot of carrying master sync signal and auxiliary synchronous signal and the LTE TDD system.
For example, can be that last 4 OFDM symbols of first time slot of front 4 OFDM symbols of second time slot of first subframe (being subframe #0) or first subframe are used for carrying P-BCH; Last OFDM symbol of second time slot of first subframe and second time slot of the 6th subframe (being subframe #5) is used for the carrying master sync signal; The penultimate OFDM symbol of second time slot of first subframe and second time slot of the 6th subframe is used for the carrying auxiliary synchronous signal.And for example, can be that last 4 OFDM symbols of first time slot of front 4 OFDM symbols of second time slot of the 6th subframe or the 6th subframe are used for carrying P-BCH; Last OFDM symbol of second time slot of first subframe and second time slot of the 6th subframe is used for the carrying master sync signal; The penultimate OFDM symbol of second time slot of first subframe and second time slot of the 6th subframe is used for the carrying auxiliary synchronous signal.
The present invention also provides a kind of sending method of synchronization signal of time-division duplex system, the base station sends respectively master sync signal and auxiliary synchronous signal on latter two OFDM symbol the same descending time slot of each field, and send P-BCH on continuous a plurality of OFDM symbols of a descending time slot of a field therein, can but to be not limited to be that continuous 4 OFDM symbols at a descending time slot of a field send P-BCH, send the time slot of master sync signal and auxiliary synchronous signal in the time slot of the primary physical broadcast channel of transmitting system broadcast and this time slot place field on same subframe, and the time slot of transmission master sync signal and auxiliary synchronous signal is different time-gap in the time slot that sends master sync signal and auxiliary synchronous signal and the LTE TDD system.
For example, the base station can send P-BCH at front 4 OFDM symbols of second time slot of first subframe, also can send P-BCH at last 4 OFDM symbols of first time slot of first subframe, in order to distinguish mutually with LTE FDD system, the time slot that sends synchronizing signal in the time slot of transmission synchronizing signal and the LTE FDD system should be different time-gap, therefore the base station can send master sync signal at last OFDM symbol of second time slot of second time slot of first subframe and the 6th subframe, and namely last the OFDM symbol at time slot #1 and time slot #11 sends master sync signal; Penultimate OFDM symbol at second time slot of second time slot of first subframe and the 6th subframe sends auxiliary synchronous signal, namely sends auxiliary synchronous signal at the penultimate OFDM of time slot #1 and time slot #11 symbol.
And for example, the base station can send P-BCH at front 4 OFDM symbols of second time slot of the 6th subframe, also can send P-BCH at last 4 OFDM symbols of first time slot of the 6th subframe; Last OFDM symbol at second time slot of second time slot of first subframe and the 6th subframe sends master sync signal, and namely last the OFDM symbol at time slot #1 and time slot #11 sends master sync signal; Penultimate OFDM symbol at second time slot of second time slot of first subframe and the 6th subframe sends auxiliary synchronous signal, namely sends auxiliary synchronous signal at the penultimate OFDM of time slot #1 and time slot #11 symbol.
The below further specifies the present invention with an application example:
As shown in Figure 3, in the LTE system, the radio frames of a 10ms is divided into two fields, it is the 0.5ms time slot that each field is divided into 10 length, two time slots form the subframe that length is 1ms, comprise 10 subframes (numbering from 0 to 9) in the radio frames, comprise 20 time slots (numbering from 0 to 19) in the radio frames.When adopting the regular circulation prefix, a subframe includes 14 OFDM symbols.For the LTE system, no matter be TDD or FDD, PBCH sends at front 4 symbols of time slot #1.The master sync signal of TDD system sends at last symbol of time slot #1 and #11, and auxiliary synchronous signal sends at the penultimate symbol of time slot #1 and #11.Synchronizing signal send mode in conjunction with LTE FDD system shown in Figure 2, can find out, in the search of LTE system cell, tdd mode and fdd mode, after obtaining the synchronizing signal timing, according to the position of correctly reading PBCH, can detect dual-mode, guaranteed simultaneously the Cell searching performance that TDD and FDD are comparable.
Claims (4)
1. the sending method of a synchronization signal of time-division duplex system comprises:
The base station sends respectively master sync signal and auxiliary synchronous signal on latter two OFDM symbol of the same fixedly descending time slot of each field, the time slot that sends master sync signal and auxiliary synchronous signal in described time slot and the frequency division duplex system is different time-gap;
The base station is the primary physical broadcast channel of transmitting system broadcast on continuous a plurality of OFDM symbols of a descending time slot of arbitrary field of described field also, sends the time slot of master sync signal and auxiliary synchronous signal in the time slot of the primary physical broadcast channel of described transmitting system broadcast and this time slot place field on same subframe.
2. the method for claim 1 is characterized in that:
Described base station sends respectively master sync signal on latter two OFDM symbol of the same descending time slot of each field and auxiliary synchronous signal refers to, the base station sends master sync signal at last OFDM symbol of a descending time slot of described each field, penultimate OFDM symbol at described descending time slot sends auxiliary synchronous signal, and described each field is divided into five subframes.
3. method as claimed in claim 2 is characterized in that:
The base station on front 4 OFDM symbols of second time slot of first subframe or last 4 OFDM symbols of first time slot of first subframe send the primary physical broadcast channel of described system broadcast message;
The base station sends master sync signal at last OFDM symbol of second time slot of second time slot of first subframe and the 6th subframe, sends auxiliary synchronous signal at the penultimate OFDM symbol of second time slot of second time slot of first subframe and the 6th subframe.
4. method as claimed in claim 2 is characterized in that:
The base station on front 4 OFDM symbols of second time slot of the 6th subframe or last 4 OFDM symbols of first time slot of the 6th subframe send the primary physical broadcast channel of described system broadcast message;
The base station sends master sync signal at last OFDM symbol of second time slot of second time slot of first subframe and the 6th subframe, sends auxiliary synchronous signal at the penultimate OFDM symbol of second time slot of second time slot of first subframe and the 6th subframe.
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