CN101102148A - A method for transmitting downlink signals of time division duplex system - Google Patents
A method for transmitting downlink signals of time division duplex system Download PDFInfo
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- CN101102148A CN101102148A CNA2007101401625A CN200710140162A CN101102148A CN 101102148 A CN101102148 A CN 101102148A CN A2007101401625 A CNA2007101401625 A CN A2007101401625A CN 200710140162 A CN200710140162 A CN 200710140162A CN 101102148 A CN101102148 A CN 101102148A
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Abstract
The invention is concerned with a kind of sending method of downlink chain signal to time division duplex system for the wireless frame to send the downlink chain signal of time division duplex system basing on orthogonal frequency division multiplexing technology. During sending the synchronization channel, it sends other sub-frame's data of part of whole frequency resource outside of the synchronization channel, in the need width of synchronization channel on the synchronization time gap of synchronization channel. The send is repeated and can be sent in repeated type. This sending method of this invention solves the waste of DwPTS time gap resource and enhances the capability of high-end terminal.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to sending method based on the down link signal of the tdd systems of orthogonal frequency division multiplexi.
Background technology
When switching when the initial connecting system of user terminal or in the minizone, user terminal need carry out cell search process.Cell search process is based on synchronizing channel, and (Synchronization Channel SCH) carries out.Synchronizing channel has special structure usually, and is to send on fixing running time-frequency resource, detects to make things convenient for user terminal, sets up with the base station to be connected.
Fig. 1 is a kind of wireless frame structure schematic diagram of the tdd systems based on orthogonal frequency division multiplexi.In this schematic diagram, the radio frames of a 10ms comprises two isometric fields, and the length of each field is 5ms.Each field comprises 7 general time slots (also claiming subframe) and 3 special time slot DwPTS, GP and UpPTS again, and wherein synchronizing channel is fixed on the DwPTS time slot and sends.
Usually, in order to keep the flexibility of system, system bandwidth can change in the larger context, and as from 1.25MHz to 20MHz, therefore, cell search process should be able to be supported all system bandwidths.Because travelling carriage is before connecting system, do not have the relevant information of any system bandwidth, in order to simplify cell search process, avoid blind Detecting to the different system bandwidth, synchronizing channel normally is benchmark with the minimum system bandwidth, 1.25MHz just, synchronizing signal only sends on the middle 1.25MHz of system bandwidth.Usually, when system bandwidth during greater than 1.25MHz, all the other frequency resources on the DwPTS time slot except synchronizing channel are not send any signal.Like this, when system bandwidth during greater than 1.25MHz, all the other frequency resources on the DwPTS time slot except synchronizing channel have just been wasted, and system bandwidth is big more, and this waste is just serious more.
On the other hand, the disposal ability of the terminal that different production firms make also is not quite similar, and high-end terminal has stronger disposal ability, and for this reason, the signal that base station side sends should be able to be provided convenience for the performance of high-end terminal.
Therefore, how rationally utilizing all the other frequency resources except synchronizing channel on the DwPTS time slot fully, and provide convenience for the performance of high-end terminal, is very significant.
Summary of the invention
Technical problem to be solved by this invention is, a kind of sending method of downlink signals of time division duplex system is provided, when system bandwidth during greater than the required bandwidth of synchronizing channel, on the synchronization slot of carrying synchronizing channel except synchronizing channel the waste problem of all the other frequency resources, improve the level of resources utilization.
The invention provides a kind of sending method of downlink signals of time division duplex system, be used for carrying out the transmission of down link signal by the radio frames based on the tdd systems of orthogonal frequency division multiplexi, described sending method comprises the steps:
When carrying out the synchronizing channel transmission, on the synchronization slot of carrying synchronizing channel, carry out synchronized transmission, in the data that send on the part or all of frequency resource except synchronizing channel on other subframe with the required bandwidth of synchronizing channel.
Further, when on the part or all of frequency resource except synchronizing channel, sending the data on other subframe, repeat to send.
Further, when on the part or all of frequency resource except synchronizing channel, sending the data on other subframe, carry out described the repetition in the frequency hopping mode and send.Described frequency hopping mode is the specific frequency hopping pattern in sub-district.Perhaps, described frequency hopping mode is any in the following manner:
Frequency hopping on the Resource Block rank; Perhaps,
Carry out the frequency hopping on the Resource Block rank earlier, and then carry out other frequency hopping of subcarrier level in Resource Block inside; Perhaps,
Other frequency hopping of subcarrier level on the full range band.
Further, described sending method further comprises:
The receiving terminal of synchronizing channel merges the corresponding or identical part that receives on the signal that repeats to send on the synchronization slot that receives and other subframe earlier, and then carries out corresponding demodulation process.
Described sending method further comprises:
If the signal that repeats to send on the synchronization slot has adopted the frequency hopping mode, during the corresponding data that on merging synchronization slot and other time slot, receives, in cell search process, obtain frequency hopping pattern.
Further, in the sending method of the present invention, the radio frames of the described tdd systems based on orthogonal frequency division multiplexi that is adopted, it is the radio frames of a 10ms, comprise that two length are the isometric field of 5ms, described each field comprises 7 general time slots and 3 special time slot DwPTS, GP and UpPTS again, wherein:
Each general time slot is also referred to as a subframe, be #0～#7, described synchronization slot is the DwPTS time slot, carry synchronizing channel on this DwPTS time slot, carry out synchronized transmission with the required bandwidth of synchronizing channel, described other subframe is the #0 subframe in this radio frames, in the data that repeat on the part or all of frequency resource except synchronizing channel on this DwPTS time slot to send on certain orthogonal frequency division multiplex OFDM symbol of described #0 subframe.
In the data that repeat in the frequency hopping mode on the part or all of frequency resource except synchronizing channel on this DwPTS time slot to send on certain orthogonal frequency division multiplex OFDM symbol of described #0 subframe.
Data on certain orthogonal frequency division multiplex OFDM symbol of described #0 subframe are data on arbitrary OFDM symbol among the orthogonal frequency division multiplex OFDM symbol # 0 of #0 subframe or #1 or #6 or the #7.
Described frequency hopping mode is to adopt the specific frequency hopping pattern in sub-district.Perhaps, described frequency hopping mode is any in the following manner:
Frequency hopping on the Resource Block rank; Perhaps,
Carry out the frequency hopping on the Resource Block rank earlier, and then carry out other frequency hopping of subcarrier level in Resource Block inside; Perhaps,
Other frequency hopping of subcarrier level on the full range band.
The down link signal sending method that adopts the present invention to describe not only can solve the problem of DwPTS time interval resource waste, and provides convenience for the performance of high-end terminal.When the disposal ability of terminal was more intense, it can merge signal that repeats to send on the DwPTS time slot and the corresponding part of a certain OFDM of subframe #0 (OFDM) symbol earlier, and then carries out corresponding demodulation process.Through such processing, the demodulation performance of data can be improved to some extent.On the other hand, if the signal that repeats to send on the DwPTS time slot has adopted the frequency hopping mode, and this frequency hopping pattern can obtain in cell search process usually, therefore, to have certain frequency diversity gain when merging this two parts of signals, thereby the demodulation performance of data will further be improved.
Description of drawings
Fig. 1 is a kind of wireless frame structure schematic diagram of the tdd systems based on orthogonal frequency division multiplexi;
Fig. 2 is that an existing down link signal sends schematic diagram;
Fig. 3 is a time-frequency domain schematic diagram of using down link signal sending method of the present invention;
Fig. 4 is the time-frequency domain schematic diagram of Another application down link signal sending method of the present invention;
Fig. 5 is a kind of time-frequency domain schematic diagram when sending in the frequency hopping mode among the present invention;
Fig. 6 is the time-frequency domain schematic diagram when another kind sends in the frequency hopping mode among the present invention;
Fig. 7 is the time-frequency domain schematic diagram when another sends in the frequency hopping mode among the present invention.
Embodiment
For ease of profound understanding the present invention, be example with wireless frame structure shown in Figure 1 below, provide the embodiment that some comprise sending method of the present invention.
Fig. 1 is a kind of wireless frame structure schematic diagram of the tdd systems based on orthogonal frequency division multiplexi.In this schematic diagram, the radio frames of a 10ms comprises two isometric fields, and the length of each field is 5ms.Each field comprises 7 general time slots (also claim subframe, #0～#6 is totally seven subframes) and 3 special time slot DwPTS, GP and UpPTS again, and wherein synchronizing channel is fixed on the DwPTS time slot and sends, and only takies the frequency resource of 1.25MHz in the middle of the system bandwidth.When system bandwidth during greater than 1.25MHz, all the other resources on the DwPTS time slot except synchronizing channel have just been wasted, and system bandwidth is big more, and this waste is just serious more.
Fig. 2 has provided the sending method of existing a kind of down link signal.On the middle 1.25MHz bandwidth of DwPTS time slot, send synchronizing signal SCH, beyond middle 1.25MHz bandwidth, do not send any data (NULL).Adopt this sending method shown in Figure 2, when system bandwidth during greater than 1.25MHz, the frequency efficiency on the DwPTS is lower.For example, LTE (LongTermEvolution according to current 3GPP, be the 3G Long Term Evolution) work supposition, when system bandwidth is 20MHz, available sub-carrier number is 1200, and synchronizing signal only takies middle 72 subcarriers, and frequency efficiency is 72/1200=6%, and other frequency resources of 94% have been wasted.
Sending method of the present invention will solve exactly when system bandwidth during greater than 1.25MHz, on the DwPTS time slot except synchronizing channel the waste problem of all the other frequency resources.Simultaneously, can also provide convenience for the performance of high-end terminal.
The main thought of sending method of the present invention is:
When carrying out the synchronizing channel transmission, on the synchronization slot of carrying synchronizing channel, carry out synchronized transmission with the required bandwidth of synchronizing channel, repeating to send the data on certain OFDM (OFDM) symbol on the subframe # 0 on the part or all of frequency resource except synchronizing channel.
Described synchronization slot is exactly the DwPTS time slot, only repeats to send the data on certain OFDM symbol of subframe # 0 on the DwPTS.DwPTS and subframe # 0 are not same subframes, and DwPTS is a special time slot, does not belong to any subframe.
In conjunction with radio frames shown in Figure 1, when system bandwidth during greater than 1.25MHz, Node B (Node B) is in the data that repeat on the part or all of frequency resource except synchronizing channel on the DwPTS time slot to send on certain OFDM (OFDM) symbol of subframe # 0, especially, can repeat to send data on the OFDM symbol that comprises frequency pilot sign among the subframe #0.In wireless frame structure as shown in Figure 1, when Cyclic Prefix (CP) is general type (Normal CP), the #0 of subframe # 0 and #6 OFDM symbol comprise the pilot tone of antenna 1 and antenna 2, #1 and #7 OFDM symbol comprise the pilot tone of antenna 3 and antenna 4, therefore, and on the frequency resource of other except synchronizing channel on the DwPTS, can repeat to send (#0, #1, #6, #7) in data on arbitrary OFDM symbol.
Further, the signal that repeats to send on the DwPTS time slot can also repeat in the mode of certain frequency hopping to send, (cell-specific) frequency hopping mode specific as the sub-district, and the frequency hopping pattern that different districts uses is different.
Fig. 3 has provided a kind of time-frequency domain schematic diagram of using down link signal sending method of the present invention.In this schematic diagram, send synchronizing signal on the 1.25MHz bandwidth in the middle of the DwPTS time slot, on other subcarriers outside the middle 1.25MHz bandwidth, repeat to send the data of the OFDM symbol # 6 of subframe #0.Similarly, also can send the data of other several time slots, for example the data of #0～#7.
Fig. 4 has provided the time-frequency domain schematic diagram of another kind of application down link signal sending method of the present invention.In this schematic diagram, on the 1.25MHz bandwidth of DwPTS time slot centre, send synchronizing signal, on other subcarriers outside the middle 1.25MHz bandwidth, repeat to send the last data of OFDM symbol # 6 of subframe # 0 in the mode of frequency hopping.Similarly, mode that also can frequency hopping repeats to send the data of other several time slots, for example data of #0～#7.
Specifically, the frequency hopping mode can have following three kinds:
Mode 1: the frequency hopping on the Resource Block rank (Resource Block level), as shown in Figure 5.
Below in conjunction with the schematic diagram that accompanying drawing 5 provides, simple declaration is other frequency hopping mode of Resource Block level once.Suppose to have 5 Resource Block, when not adopting the frequency hopping mode to send, Resource Block RB#0～RB#4 sends on frequency range a～e successively; When adopting other frequency hopping mode of Resource Block level to send, as frequency hopping unit, the frequency band at whole Resource Block place changes with Resource Block.Originally on frequency band a, sent as RB# 0,, on frequency band b, sent through after the frequency hopping; RB# 1 sent on frequency band b originally, through after the frequency hopping, sent on frequency band d; Other Resource Block is similar.The frequency hopping pattern that is adopted is known in advance, as adopting the frequency hopping pattern of sub-district specific (cell-specific).
Mode 2: carry out the frequency hopping on the Resource Block rank (Resource Block level) earlier, and then carry out the frequency hopping of subcarrier rank (Sub-Carrier level) in Resource Block inside, as shown in Figure 6.
Mode 3: the frequency hopping of subcarrier rank (Sub-Carrierlevel) on the full range band, as shown in Figure 7.
Wherein, to repeat to send be a kind of situation that repeats to send to the frequency hopping mode.In the time-frequency domain schematic diagram of the application that Fig. 4 provides down link sending method of the present invention, the frequency hopping mode has adopted other frequency hopping of subcarrier level on the full range band.
Adopt the sending method of the down link signal that the present invention describes, not only can solve the problem of DwPTS time interval resource waste, and provide convenience for the performance of high-end terminal.
For example, when the disposal ability of terminal was more intense, it can the part that the signal that repeats to send on the DwPTS time slot is corresponding or identical with a certain OFDM symbol of subframe # 0 merge earlier, and then carries out corresponding demodulation process.Through such processing, the demodulation performance of data can be improved to some extent.On the other hand, if the signal that repeats to send on the DwPTS time slot has adopted the frequency hopping mode, and frequency hopping pattern can obtain in cell search process usually, therefore, to have certain frequency diversity gain when merging this two parts of signals, thereby the demodulation performance of data will further be improved.
Those skilled in the art that should be understood that the above only is preferred embodiment of the present invention, are not to be used for limiting practical range of the present invention; Everyly do equivalence according to the present invention and change and revise, all contained by claim of the present invention.
Claims (12)
1, a kind of sending method of downlink signals of time division duplex system is used for carrying out the transmission of down link signal by the radio frames based on the tdd systems of orthogonal frequency division multiplexi, it is characterized in that:
When carrying out the synchronizing channel transmission, on the synchronization slot of carrying synchronizing channel, carry out synchronized transmission, in the data that send on the part or all of frequency resource except synchronizing channel on other subframe with the required bandwidth of synchronizing channel.
2, sending method as claimed in claim 1 is characterized in that:
When on the part or all of frequency resource except synchronizing channel, sending the data on other subframe, repeat to send.
3, sending method as claimed in claim 2 is characterized in that:
When on the part or all of frequency resource except synchronizing channel, sending the data on other subframe, carry out described the repetition in the frequency hopping mode and send.
4, sending method as claimed in claim 3 is characterized in that, described frequency hopping mode is the specific frequency hopping pattern in sub-district.
5, sending method as claimed in claim 3 is characterized in that, described frequency hopping mode is any in the following manner:
Frequency hopping on the Resource Block rank; Perhaps,
Carry out the frequency hopping on the Resource Block rank earlier, and then carry out other frequency hopping of subcarrier level in Resource Block inside; Perhaps,
Other frequency hopping of subcarrier level on the full range band.
6, as claim 2 or 4 described sending methods, it is characterized in that described sending method further comprises:
The receiving terminal of synchronizing channel merges the corresponding or identical part that receives on the signal that repeats to send on the synchronization slot that receives and other subframe earlier, and then carries out corresponding demodulation process.
7, sending method as claimed in claim 6 is characterized in that, described sending method further comprises:
If the signal that repeats to send on the synchronization slot has adopted the frequency hopping mode, during the corresponding data that on merging synchronization slot and other time slot, receives, in cell search process, obtain frequency hopping pattern.
8, sending method as claimed in claim 1 is characterized in that:
The radio frames of described tdd systems based on orthogonal frequency division multiplexi, it is the radio frames of a 10ms, comprise that two length are the isometric field of 5ms, described each field comprises 7 general time slots and 3 special time slot DwPTS, GP and UpPTS again, wherein:
Each general time slot is also referred to as a subframe, be #0～#7, described synchronization slot is the DwPTS time slot, carry synchronizing channel on this DwPTS time slot, carry out synchronized transmission with the required bandwidth of synchronizing channel, described other subframe is the #0 subframe in this radio frames, in the data that repeat on the part or all of frequency resource except synchronizing channel on this DwPTS time slot to send on certain orthogonal frequency division multiplex OFDM symbol of described #0 subframe.
9, sending method as claimed in claim 8 is characterized in that:
In the data that repeat in the frequency hopping mode on the part or all of frequency resource except synchronizing channel on this DwPTS time slot to send on certain orthogonal frequency division multiplex OFDM symbol of described #0 subframe.
10, sending method as claimed in claim 8 or 9 is characterized in that:
Data on certain orthogonal frequency division multiplex OFDM symbol of described #0 subframe are data on arbitrary OFDM symbol among the orthogonal frequency division multiplex OFDM symbol #0 of #0 subframe or #1 or #6 or the #7.
11, sending method as claimed in claim 9 is characterized in that, described frequency hopping mode is to adopt the specific frequency hopping pattern in sub-district.
12, sending method as claimed in claim 9 is characterized in that, described frequency hopping mode is any in the following manner:
Frequency hopping on the Resource Block rank; Perhaps,
Carry out the frequency hopping on the Resource Block rank earlier, and then carry out other frequency hopping of subcarrier level in Resource Block inside; Perhaps,
Other frequency hopping of subcarrier level on the full range band.
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| CNA2007101401625A CN101102148A (en) | 2007-08-08 | 2007-08-08 | A method for transmitting downlink signals of time division duplex system |
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| CNA2007101401625A CN101102148A (en) | 2007-08-08 | 2007-08-08 | A method for transmitting downlink signals of time division duplex system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009049489A1 (en) * | 2007-10-11 | 2009-04-23 | China Mobile Communications Corporation | Communication method and apparatus |
| WO2009092336A1 (en) * | 2008-01-21 | 2009-07-30 | Huawei Technologies Co., Ltd. | Method and apparatus for transmitting information by using cyclic prefix time slots |
| WO2009094877A1 (en) * | 2008-01-25 | 2009-08-06 | Zte Corporation | Method and apparatus of sending synchronization signals in tdd systems |
| WO2009097821A1 (en) * | 2008-02-03 | 2009-08-13 | Da Tang Mobile Communications Equipment Co., Ltd. | Method and device for downlink transmission |
| CN101610132B (en) * | 2008-06-17 | 2012-12-19 | 中兴通讯股份有限公司 | Method for realizing downlink control channel in wireless communication system |
| CN105119633A (en) * | 2015-07-31 | 2015-12-02 | 广州海格通信集团股份有限公司 | Narrowband high-speed frequency-hopping data sending and receiving method |
| WO2016131352A1 (en) * | 2015-02-16 | 2016-08-25 | 电信科学技术研究院 | Data transmission method and device in time division duplex system |
| CN113632572A (en) * | 2021-07-08 | 2021-11-09 | 北京小米移动软件有限公司 | Frequency hopping method, device, user equipment, base station and storage medium |
-
2007
- 2007-08-08 CN CNA2007101401625A patent/CN101102148A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009049489A1 (en) * | 2007-10-11 | 2009-04-23 | China Mobile Communications Corporation | Communication method and apparatus |
| WO2009092336A1 (en) * | 2008-01-21 | 2009-07-30 | Huawei Technologies Co., Ltd. | Method and apparatus for transmitting information by using cyclic prefix time slots |
| WO2009094877A1 (en) * | 2008-01-25 | 2009-08-06 | Zte Corporation | Method and apparatus of sending synchronization signals in tdd systems |
| US8520660B2 (en) | 2008-01-25 | 2013-08-27 | Zte Corporation | Method and apparatus of sending synchronization signals in TDD systems |
| WO2009097821A1 (en) * | 2008-02-03 | 2009-08-13 | Da Tang Mobile Communications Equipment Co., Ltd. | Method and device for downlink transmission |
| CN101499963B (en) * | 2008-02-03 | 2011-07-20 | 大唐移动通信设备有限公司 | Method and apparatus for downlink transmission |
| CN101610132B (en) * | 2008-06-17 | 2012-12-19 | 中兴通讯股份有限公司 | Method for realizing downlink control channel in wireless communication system |
| WO2016131352A1 (en) * | 2015-02-16 | 2016-08-25 | 电信科学技术研究院 | Data transmission method and device in time division duplex system |
| US10574429B2 (en) | 2015-02-16 | 2020-02-25 | China Academy Of Telecommunications Technology | Data transmission method and device for time division duplex system |
| CN105119633A (en) * | 2015-07-31 | 2015-12-02 | 广州海格通信集团股份有限公司 | Narrowband high-speed frequency-hopping data sending and receiving method |
| CN113632572A (en) * | 2021-07-08 | 2021-11-09 | 北京小米移动软件有限公司 | Frequency hopping method, device, user equipment, base station and storage medium |
| CN113632572B (en) * | 2021-07-08 | 2024-05-14 | 北京小米移动软件有限公司 | Frequency hopping method, device, user equipment, base station and storage medium |
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