CN1960209A - Communication method and device under mode of frequency division duplexing - Google Patents
Communication method and device under mode of frequency division duplexing Download PDFInfo
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- CN1960209A CN1960209A CN 200510117255 CN200510117255A CN1960209A CN 1960209 A CN1960209 A CN 1960209A CN 200510117255 CN200510117255 CN 200510117255 CN 200510117255 A CN200510117255 A CN 200510117255A CN 1960209 A CN1960209 A CN 1960209A
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- 238000005516 engineering process Methods 0.000 description 8
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Abstract
1st frequency band of the down-going signal sent by the base station and the 2nd frequency band of the up-going signal sent by the mobile station are setup in advance. The wireless channel carrying the mentioned down going and up going signals includes several wireless frames. Each wireless frame contains the normal slot and the special slot. The base station sends the down going signal via the 1st frequency band within the normal slot. The mobile station sends the up going signal via the 2nd frequency band within the normal slot. When applies this invention to the semi-duplex frequency division duplex mode, the normal slot is split into the 1st time section and the 2nd time section. The mobile station sends the up going signal via the 2nd frequency band within the 1st time section of the normal slot and receives the down-going signal within the 2nd time section. The invention realizes that the TDD system is extended to apply under the FDD mode.
Description
Technical field
The present invention relates to the communication technology of wireless communication system, be specifically related to communication means and equipment under the mode of frequency division duplexing.
Background technology
In the spectrum allocation may and application of radio communication, both existed and be suitable for FDD (Frequency DivisionDuplexing, Frequency Division Duplexing (FDD)) the paired frequency spectrum of Ying Yonging also exists to be suitable for the non-paired frequency spectrum that TDD (Time DivisionDuplexing, time division duplex) uses.
Upward signal transmits on a frequency and communication pattern that downstream signal transmits on another frequency is called fdd mode; Upward signal is in a time slot or transmission and downstream signal is called tdd mode at another different time slot or the communication pattern that transmits on the period on the period.In the wireless communication system in future, two kinds of duplex modes all will be developed and be used accordingly.
TD-SCDMA (TimeDivision-SynchronousCDMA TD SDMA) system is a third generation cell mobile communication systems that is applied to tdd mode.At present, TD-SCDMA system and technology thereof only are applied to TDD mode, and WCDMA system and technology thereof are only used under mode of frequency division duplexing.From air interface, the TDD of 3GPP and FDD are two systems that have on technology and standard than big difference.People wish that equipment manufacturers or service provider can be applied to the technology and the design of a wireless communication system in multiple duplex mode work, thereby for different market, geographic area or customer type provide service, so that reduce equipment cost, simplification application.If therefore the TD-SCDMA system can be expanded, make it also can be applied to work under the fdd mode, a unified solution that is applicable to various spectrum allocation may situations will be provided.
Summary of the invention
The technical problem to be solved in the present invention is: communication means and equipment under a kind of mode of frequency division duplexing are provided, present TD-SCDMA system is worked under fdd mode.
For solving the problems of the technologies described above, the invention provides the communication means under a kind of mode of frequency division duplexing, described mode of frequency division duplexing is the full duplex mode of frequency division duplexing, the base station at first is set sends first frequency band of downstream signal and second frequency band that travelling carriage sends upward signal; The wireless channel that carries described downstream signal and upward signal comprises several radio frames, and each radio frames comprises conventional time slot and special time slot; Described base station sends downstream signal with first frequency band in described conventional time slot; Described travelling carriage sends upward signal at described conventional time slot with second frequency band.
Wherein, described radio frames comprises seven conventional time slots and three special time slots, and described special time slot comprises descending pilot frequency time slot, uplink pilot time slot and protection time slot.
Wherein, described base station sends downstream signal or do not send signal in described special time slot at described special time slot; Described travelling carriage sends upward signal or do not send signal in described special time slot at described special time slot.
The present invention also provides a kind of base station, and described base station works in the full duplex mode of frequency division duplexing, and described base station comprises transmitter, be used at first frequency band to described travelling carriage transmitting downstream signal,
Receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range;
Controller connects described transmitter and described receiver, and described controller moves according to radio frames, and described radio frames comprises conventional time slot and special time slot; Described controller is controlled described transmitter at described conventional time slot transmitting downstream signal, and described receiver receives upward signal at conventional time slot.
Wherein, described radio frames comprises seven conventional time slots and three special time slots, and described special time slot comprises descending pilot frequency time slot, uplink pilot time slot and protection time slot.
Wherein, described controller is controlled described transmitter and is not sent signal at described special time slot transmission downstream signal or at this special time slot.
The present invention also provides a kind of travelling carriage, and described operating mobile station is in the full duplex mode of frequency division duplexing, and described travelling carriage comprises receiver, be used for receiving described base station downstream signal at first frequency band,
Receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range;
Controller connects described transmitter and described receiver, and described controller moves according to radio frames, and described radio frames comprises conventional time slot and special time slot; Described controller is controlled described transmitter at described conventional time slot transmit uplink signal, and described first receiver receives downstream signal at conventional time slot.
Wherein, described radio frames comprises seven conventional time slots and three special time slots, and described special time slot comprises descending pilot frequency time slot, uplink pilot time slot and protection time slot.
Wherein, described controller is controlled described transmitter and is not sent signal at described special time slot transmission upward signal or at this special time slot.
The present invention also provides the communication means under a kind of mode of frequency division duplexing, and described mode of frequency division duplexing is the half-duplex frequency division duplex pattern, sets in advance the base station and sends first frequency band of downstream signal and second frequency band that travelling carriage sends upward signal; The wireless channel that carries described downstream signal and upward signal comprises several radio frames, each radio frames comprises conventional time slot and special time slot, described conventional time slot comprises the very first time section and second time period, and described very first time section and second time period isolate on time domain; Described base station sends downstream signal in the very first time of described conventional time slot section with in second time period with first frequency band; Described travelling carriage sends upward signal with second frequency band in the very first time of described conventional time slot section, receive described downstream signal in described second time period.
Wherein, described radio frames comprises seven conventional time slots and three special time slots, and described special time slot comprises descending pilot frequency time slot, uplink pilot time slot and protection time slot.
Wherein, described base station sends downstream signal or do not send signal in described special time slot at described special time slot; Described travelling carriage sends upward signal or does not send signal at this special time slot at described special time slot.
The present invention also provides a kind of base station, and described base station works in the half-duplex frequency division duplex pattern, it is characterized in that, described base station comprises transmitter, be used at first frequency band to described travelling carriage transmitting downstream signal,
Receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range;
Controller connects described transmitter and described receiver, and described controller moves according to radio frames, conventional time slot of described radio frames and special time slot, and described conventional time slot comprises the very first time section and second time period; Described controller is controlled described transmitter and in the described very first time section downstream signal is emitted to first travelling carriage, in described second time period described downstream signal is emitted to second travelling carriage; And described receiver receives the upward signal of described second travelling carriage in very first time section, and second time period received the upward signal of described first travelling carriage.
The present invention also provides a kind of travelling carriage, and described operating mobile station is characterized in that in the half-duplex frequency division duplex pattern described travelling carriage comprises receiver, be used for receiving described base station downstream signal at first frequency band,
Receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range;
Controller connects described transmitter and described receiver, and described controller moves according to radio frames, and described radio frames comprises conventional time slot and special time slot, and described conventional time slot comprises the very first time section and second time period; Described controller is controlled described transmitter at described very first time section transmit uplink signal, and described receiver receives downstream signal in described second time period; Or described controller controls described transmitter at the described second time period transmit uplink signal, and described receiver receives downstream signal in described very first time section.
Compared with prior art, the invention has the beneficial effects as follows: the present invention sends first frequency band of downstream signal and second frequency band that travelling carriage sends upward signal by the base station is set, make base station and travelling carriage receiving and transmitting signal on the carrier wave of different frequency, realize the FDD mode of operation, simultaneously, control base station and travelling carriage receiving and transmitting signal in the conventional time slot of the radio frames of wireless channel keep the present frame structure of TD-SCDMA, thereby make present TD-SCDMA system can work in fdd mode.And,, thereby reduce cost, simplify application owing to TD-SCDMA systems technology and design can be applied in FDD and two kinds of duplex mode work of TDD.
Further, the present invention also provides the communication means under the half-duplex fdd mode, and the conventional time slot of system is divided into two time periods according to the time, receives and dispatches in the different time periods, thereby make the TD-SCDMA system be applicable to the various situations of fdd mode, increase versatility of the present invention.
Description of drawings
Fig. 1 is the communication means under the full duplex fdd mode;
Fig. 2 is the communication means under the half-duplex fdd mode;
Fig. 3 is the structure chart of the time frame of TD-SCDMA system physical channel;
Fig. 4 is the structure chart of the subframe of time frame in the TD-SCDMA system;
Fig. 5 is the frame structure of the down channel of full duplex fdd mode among the present invention;
Fig. 6 is the frame structure of the up channel of full duplex fdd mode among the present invention;
Fig. 7 is the frame structure of the mobile station side down channel of half-duplex fdd mode among the present invention;
Fig. 8 is the frame structure of the mobile station side up channel of half-duplex fdd mode among the present invention.
Embodiment
The invention provides communication means and equipment under the mode of frequency division duplexing, the TD-SCDMA system extension is applied to fdd mode.
The present invention at first provides the communication means under the full duplex fdd mode, and Fig. 1 is a flow chart.In order to realize fdd mode communication, need set in advance the base station and send first frequency band of downstream signal and second frequency band (S1) that travelling carriage sends upward signal; Use the WCDMA of fdd mode work that every 10ms is divided into a time frame at present, and each time frame comprises 15 isometric time slots, this frame structure and TD-SCDMA system have than big difference, solve the TD-SCDMA system extension to fdd mode work down, how the time frame structure that the most important thing is to solve TD-SCDMA is applied to the problem of fdd mode, in order to make present TD-SCDMA system can use fdd mode, the wireless frame structure that the present invention will be carried the wireless channel of upward signal and downstream signal is arranged time slot according to the frame structure of TD-SCDMA, and described time slot comprises conventional time slot and special time slot (S2); Described base station sends downstream signal with first frequency band in described conventional time slot; Described travelling carriage sends upward signal (S3) at described conventional time slot with second frequency band.In order to keep consistent with existing TD-SCDMA system frame structure, described base station sends downstream signal at described special time slot, in addition, because the system of working down for fdd mode need not pilot signal transmitted, therefore in described special time slot, also can not send signal; Equally, can send upward signal at described special time slot, also in described special time slot, not send signal for described travelling carriage.
With above-mentioned communication means corresponding equipment, the present invention at first provides the base station of using this fdd mode to communicate, described base station works in the FDD full-duplex mode, described base station comprises transmitter, be used at first frequency band to described travelling carriage transmitting downstream signal, receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range; Controller connects described transmitter and described receiver, and described controller moves according to radio frames, and described radio frames is arranged time slot according to the frame structure of TD-SCDMA, and described time slot comprises 7 conventional time slots and 3 special time slots; Described controller is controlled described transmitter at described conventional time slot transmitting downstream signal, and described receiver receives upward signal at conventional time slot.Described controller is controlled described transmitter and is sent downstream signal or do not send signal at this special time slot at described special time slot.
With above-mentioned communication means corresponding equipment, the present invention also is provided at mobile stations communicating under this fdd mode, described operating mobile station is in the FDD full-duplex mode, described travelling carriage comprises receiver, be used for receiving described base station downstream signal at first frequency band, receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range; Controller connects described transmitter and described receiver, and described controller moves according to radio frames, and described radio frames is arranged time slot according to the frame structure of TD-SCDMA, and described time slot comprises 7 conventional time slots and 3 special time slots; Described controller is controlled described transmitter at described conventional time slot transmit uplink signal, and described first receiver receives downstream signal at conventional time slot.Described controller is controlled described transmitter and is sent upward signal or do not send signal at this special time slot at described special time slot.
Further, because fdd mode comprises half-duplex FDD, the communication means of TD-SCDMA system provided by the invention under the half-duplex fdd mode as shown in Figure 2, need at first be provided with the base station equally and send first frequency band of downstream signal and second frequency band (S1) that travelling carriage sends upward signal; The wireless channel of carrying wireless signal comprises several radio frames, described radio frames comprises 7 conventional time slots and 3 special time slots (S2), FDD is different with full duplex, because for travelling carriage, received signal or send signal in a period of time only, therefore described conventional time slot need be divided into the very first time section and second time period, and described very first time section and second time period are isolated (S3) on time domain; Described base station sends downstream signal in the very first time of described conventional time slot section with in second time period with first frequency band; Described travelling carriage sends upward signal with second frequency band in the very first time of described conventional time slot section, receive described downstream signal (S4) in described second time period.Described base station sends downstream signal or do not send signal in described special time slot at described special time slot; Described travelling carriage sends upward signal or does not send signal at this special time slot at described special time slot.
Corresponding with the communication means that works in half-duplex FDD, the base station of the present invention when the half-duplex fdd mode comprises transmitter, is used at first frequency band to described travelling carriage transmitting downstream signal, receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range; And controller, connecting described transmitter and described receiver, described controller moves according to radio frames, and described radio frames comprises conventional time slot and special time slot, and described conventional time slot comprises the very first time section and second time period; Described controller is controlled described transmitter and in the described very first time section downstream signal is emitted to first travelling carriage, in described second time period described downstream signal is emitted to second travelling carriage; And described receiver receives the upward signal of described second travelling carriage in very first time section, and second time period received the upward signal of described first travelling carriage.
And receive the travelling carriage of the downstream signal that described base station sends, and comprise receiver, be used for receiving described base station downstream signal at first frequency band, receiver is used for receiving in second frequency range upward signal of described travelling carriage emission; Controller connects described transmitter and described receiver, and described controller moves according to radio frames, and described radio frames comprises 7 conventional time slots and 3 special time slots, and described conventional time slot comprises the very first time section and second time period; Described controller is controlled described transmitter at described very first time section transmit uplink signal, and described receiver receives downstream signal in described second time period; Or described controller controls described transmitter at the described second time period transmit uplink signal, and described receiver receives downstream signal in described very first time section.
For a better understanding of the present invention, below set forth the specific implementation process that among the present invention the frame structure of TD-SCDMA system is used for FDD.
Fig. 3 is the wireless frame structure of present TD-SCDMA system physical channel.The frame structure of TD-SCDMA physical layer channel is divided into 3 layers: radio frames Radio Frame, subframe Sub-Frame and time slot TimeSlot (or being called burst Burst).Each is wireless frame length 10ms is divided into the subframe of two 5ms.Fig. 4 is the structure chart of certain subframe of TD-SCDMA.Each subframe is by seven conventional time slot TS0-TS6, and each slot length is 675 μ s and three special time slots: descending pilot frequency time slot (DwPTS), uplink pilot time slot (UpPTS) and protection time slot (GP) constitute.
In seven conventional time slots, (SP, SwitchingPoint) separately, in the TD-SCDMA system, the subframe of each 5ms has two transfer points (UL to DL and DL to UL) by transfer point between ascending time slot and the descending time slot.
At the TD-SCDMA system or adopt the tdd systems of similar frame structure, the present invention is used for mode of frequency division duplexing with original frame structure of using under TDD mode.
For the application of full duplex fdd mode, the frame structure of its down channel as shown in Figure 5.Wherein DT represents the special time slot of FDD down channel, and promptly the special time slot of TD-SCDMA system frame structure is consistent at present, can comprise descending pilot frequency time slot in this time slot, also can not send signal.For the application of full duplex FDD mode, the frame structure of its up channel as shown in Figure 6.Wherein UT represents the special time slot of FDD up channel, can comprise uplink pilot time slot equally, also can not send signal.
At the application of TD-SCDMA system fdd mode, can also be operated in the half-duplex fdd mode, described half-duplex fdd mode is meant that upward signal is not only different on frequency with downstream signal, and non-overlapping copies in time.Also can regard the duplex mode that time and frequency are all separated as; Under the half-duplex fdd mode, can system be set to two groups of semiduplex subsystem work: the resource of the conventional time slot of FDD is divided into two groups, the conventional time slot non-overlapping copies in time of uplink and downlink in each group promptly of the present inventionly is divided into the very first time section and second time period; For the application of half-duplex FDD mode, because therefore the corresponding a plurality of travelling carriages in base station need send downstream signal in all conventional time slots, therefore, one side from the base station, the frame structure of its up-downgoing channel frame structure during with full duplex is identical, can be referring to 5 and Fig. 6.
And for travelling carriage, owing to adopt the half-duplex fdd mode, therefore for a travelling carriage, only in certain time period, receive the signal that the base station sends, in another time period to base station transmit signals, therefore for the application of half-duplex FDD mode, from terminal one side, can be divided into two groups, can select to carry out the signal transmission, also can carry out the signal transmission according to the frame structure of up-downgoing channel shown in Figure 8 according to the frame structure of up-downgoing channel shown in Figure 7.It is worthy of note, Fig. 7 and up channel shown in Figure 8 and the time slot uniform distribution of down channel, the present invention is equally applicable to the uneven situation of time slot allocation of up-downgoing channel.
The wireless frame structure of the present invention during for the communication means under the fdd mode is not limited to existing TD-SCDMA system, goes for the system of evolution system or employing and the similar frame structure of TD-SCDMA of TD-SCDMA equally.
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 considered as protection scope of the present invention.
Claims (14)
1, the communication means under a kind of mode of frequency division duplexing, described mode of frequency division duplexing is the full duplex mode of frequency division duplexing, it is characterized in that, comprises step: the base station is set sends first frequency band of downstream signal and second frequency band that travelling carriage sends upward signal; The wireless channel that carries described downstream signal and upward signal comprises several radio frames, and each radio frames comprises conventional time slot and special time slot; Described base station sends downstream signal with first frequency band in described conventional time slot; Described travelling carriage sends upward signal at described conventional time slot with second frequency band.
2, the communication means under the mode of frequency division duplexing according to claim 1 is characterized in that: described radio frames comprises seven conventional time slots and three special time slots, and described special time slot comprises descending pilot frequency time slot, uplink pilot time slot and protection time slot.
3, the communication means under the mode of frequency division duplexing according to claim 2 is characterized in that, described base station sends downstream signal or do not send signal in described special time slot at described special time slot; Described travelling carriage sends upward signal or do not send signal in described special time slot at described special time slot.
4, a kind of base station, described base station works in the full duplex mode of frequency division duplexing, it is characterized in that, and described base station comprises transmitter, is used at first frequency band to described travelling carriage transmitting downstream signal,
Receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range;
Controller connects described transmitter and described receiver, and described controller moves according to radio frames, and described radio frames comprises conventional time slot and special time slot; Described controller is controlled described transmitter at described conventional time slot transmitting downstream signal, and described receiver receives upward signal at conventional time slot.
5, base station according to claim 4 is characterized in that: described radio frames comprises seven conventional time slots and three special time slots, and described special time slot comprises descending pilot frequency time slot, uplink pilot time slot and protection time slot.
6, base station according to claim 5 is characterized in that, described controller is controlled described transmitter and sent downstream signal or do not send signal at this special time slot at described special time slot.
7, a kind of travelling carriage, described operating mobile station is characterized in that in the full duplex mode of frequency division duplexing described travelling carriage comprises receiver, be used for receiving described base station downstream signal at first frequency band,
Receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range;
Controller connects described transmitter and described receiver, and described controller moves according to radio frames, and described radio frames comprises conventional time slot and special time slot; Described controller is controlled described transmitter at described conventional time slot transmit uplink signal, and described first receiver receives downstream signal at conventional time slot.
8, travelling carriage according to claim 7 is characterized in that: described radio frames comprises seven conventional time slots and three special time slots, and described special time slot comprises descending pilot frequency time slot, uplink pilot time slot and protection time slot.
9, travelling carriage according to claim 8 is characterized in that: described controller is controlled described transmitter and is sent upward signal or do not send signal at this special time slot at described special time slot.
10, the communication means under a kind of mode of frequency division duplexing, described mode of frequency division duplexing is the half-duplex frequency division duplex pattern, it is characterized in that, comprises step: the base station is set sends first frequency band of downstream signal and second frequency band that travelling carriage sends upward signal; The wireless channel that carries described downstream signal and upward signal comprises several radio frames, each radio frames comprises conventional time slot and special time slot, described conventional time slot comprises the very first time section and second time period, and described very first time section and second time period isolate on time domain; Described base station sends downstream signal in the very first time of described conventional time slot section with in second time period with first frequency band; Described travelling carriage sends upward signal with second frequency band in the very first time of described conventional time slot section, receive described downstream signal in described second time period.
11, the communication means under the mode of frequency division duplexing according to claim 10 is characterized in that, described radio frames comprises seven conventional time slots and three special time slots, and described special time slot comprises descending pilot frequency time slot, uplink pilot time slot and protection time slot.
12, the communication means under the mode of frequency division duplexing according to claim 11 is characterized in that, described base station sends downstream signal or do not send signal in described special time slot at described special time slot; Described travelling carriage sends upward signal or does not send signal at this special time slot at described special time slot.
13, a kind of base station, described base station works in the half-duplex frequency division duplex pattern, it is characterized in that, and described base station comprises transmitter, is used at first frequency band to described travelling carriage transmitting downstream signal,
Receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range;
Controller connects described transmitter and described receiver, and described controller moves according to radio frames, conventional time slot of described radio frames and special time slot, and described conventional time slot comprises the very first time section and second time period; Described controller is controlled described transmitter and in the described very first time section downstream signal is emitted to first travelling carriage, in described second time period described downstream signal is emitted to second travelling carriage; And described receiver receives the upward signal of described second travelling carriage in very first time section, and second time period received the upward signal of described first travelling carriage.
14, a kind of travelling carriage, described operating mobile station is characterized in that in the half-duplex frequency division duplex pattern described travelling carriage comprises receiver, be used for receiving described base station downstream signal at first frequency band,
Receiver is used for receiving the upward signal that described travelling carriage is launched in second frequency range;
Controller connects described transmitter and described receiver, and described controller moves according to radio frames, and described radio frames comprises conventional time slot and special time slot, and described conventional time slot comprises the very first time section and second time period; Described controller is controlled described transmitter at described very first time section transmit uplink signal, and described receiver receives downstream signal in described second time period; Or described controller controls described transmitter at the described second time period transmit uplink signal, and described receiver receives downstream signal in described very first time section.
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| CN 200510117255 CN1960209A (en) | 2005-10-31 | 2005-10-31 | Communication method and device under mode of frequency division duplexing |
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| CN102362447B (en) * | 2008-11-14 | 2014-08-20 | Dbsd卫星业务G.P.公司 | Flexible use of asymmetric time-division duplexing in the spectrum |
| WO2010102450A1 (en) * | 2009-03-11 | 2010-09-16 | 华为技术有限公司 | Method, device and system for identifying different frame structures |
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