CN101197803B - Method, device and system for data transmission in TDD system - Google Patents

Abstract

The invention discloses a method, device and system for sending data in a time division duplex system, which are used to solve the problem in the prior art that downlink data between adjacent cells interferes with uplink data; The high-power transmission channel is mapped to the OFDM symbol of the downlink time slot in the transmission frame, and the interval between the guard interval in the transmission frame and the OFDM symbol in the time domain does not map any of the full-cell coverage channel and the high-power transmission channel The OFDM symbol of the channel; the uplink control channel is mapped to the OFDM symbol of the uplink time slot in the transmission frame, and the OFDM symbol of the unmapped uplink control channel is spaced between the guard interval and the OFDM symbol of the uplink control channel in the time domain ; sending the OFDM symbol of the transmission frame; adopting the present invention can avoid interference between downlink data and uplink data between adjacent cells.

Description

A method, device and system for sending data in a time division duplex system

technical field

The invention relates to the field of mobile communication, in particular to a method, device and system for sending data in a time division duplex system. the

Background technique

Time Division Duplex (TDD, Time Division Duplex) mode is a mode of wireless transmission in a wireless channel, which is realized by periodically repeating the Time Division Multiple Access (TDMA, Time Division Multiple Access) frame structure in the time domain. In TDD mode, transmission and reception are performed in time-division. The wireless transmission method based on TDD mode enables time-division multiplexing of uplink and downlink channels. The biggest advantage of this mode is that it can work in the frequency band without image frequency. Like the frequency division duplex (FDD, Frequency Division Duplex) mode, the frequency band requirements are so strict. The frame structure in TDD mode is subdivided into several time slots, and the time slot allocation between uplink and downlink can be changed by a flexible switching point to meet different business requirements. In TDD wireless network transmission, a certain guard interval (GP, Guard Period) or downlink uplink conversion time (DUP, Downlink Uplink Period) is required for downlink/uplink switching. the

In the frame structure diagram of the 3GPP36.211 system shown in Figure 1, a 10ms wireless frame consists of two 5ms wireless subframes, and each wireless subframe consists of 7 ordinary time slots and 3 special time slots Among them, ordinary time slots (Time Slot, TS0~TS6) are used to transmit data, TS0 is fixedly used as a downlink time slot, TS1 time slot is fixedly used as an uplink time slot, and other ordinary time slots TS2~TS6 can be used as needed It can be flexibly configured as uplink time slot or downlink time slot to realize the transmission of asymmetric services; the three special time slots are downlink pilot time slot (DwPTS, Downlink Pilot Time Slot), uplink pilot time slot (UpPTS, Uplink Pilot Time Slot) Time Slot) and guard interval (GP, Guard Period); the downlink pilot time slot DwPTS before the guard interval GP is used for the transmission of downlink synchronization information of the system, which requires full cell coverage, so it will affect the uplink of adjacent cells after GP The time slot causes great interference. In addition, the uplink pilot time slot UpPTS after the GP is used to initialize random access. Since the uplink synchronization is not obtained, it may be much earlier, so it will further strengthen the adjacent cells unique to the TDD system. The downlink data of the two-tier cell, the third-tier cell, or the fourth-tier cell interferes with the uplink data of the cell (according to the field test of the TD-SCDMA system, the downlink data of the third-tier cell and the fourth-tier cell may also interfere with the cell Uplink data interference), UpPTS is the first step for users to access the network, which directly affects whether users can access the network to enjoy services. Therefore, ensuring the accurate transmission of these information is a prerequisite for the normal operation of wireless communication networks. the

In the frame structure diagram of the 802.16e system shown in Figure 2, control information other than the broadcast message is sent in the downlink burst DL burst. , Orthogonal Frequency Division Multiplex) symbols, and it is sent at full power, which will cause great interference to the uplink data of adjacent cells. In addition, the initial access Initial ranging information is random access information in the uplink time slot At this time, it will be interfered by the downlink data of adjacent cells, second-layer cells, third-layer cells, or fourth-layer cells. the

It can be seen from the above that in the existing time division duplex system, the downlink data used for the synchronization channel, broadcast channel or control channel transmission of the cell is sent on the last OFDM symbol of the downlink time slot, and the main control information of the uplink is sent in the uplink time slot Therefore, the interference of downlink signals between adjacent cells to uplink signals cannot be avoided, resulting in low data transmission efficiency and transmission reliability of the system. the

Contents of the invention

The invention provides a method for sending data in a time-division duplex system, which is used to solve the problem in the existing system that the downlink signal between adjacent cells interferes with the uplink signal, resulting in low data transmission efficiency and transmission reliability of the system. the

The present invention provides following technical scheme:

A method for sending data in a time division duplex system, comprising steps:

The whole cell coverage channel or the high power transmission channel is mapped to the OFDM symbol of the downlink time slot in the transmission frame, and the guard interval in the transmission frame is separated from the OFDM symbol in the time domain without mapping the whole cell coverage channel and the large OFDM symbols of any channel in the power transmission channel;

Mapping the uplink control channel to the OFDM symbol of the uplink time slot in the transmission frame, and the OFDM symbol that is not mapped to the uplink control channel is spaced between the guard interval and the OFDM symbol that maps the uplink control channel in the time domain;

Send the OFDM symbol of the transmission frame;

Wherein, the guard interval is a guard interval that plays a protective role when the downlink time slot and the uplink time slot are switched. the

A method for sending data in a time-division duplex system, applied to a 3GPP LTE long-term evolution system, comprising steps:

The whole cell coverage channel or the high power transmission channel is mapped to the OFDM symbol of the downlink time slot in the transmission frame, and the guard interval in the transmission frame is separated from the OFDM symbol in the time domain without mapping the whole cell coverage channel and the large The OFDM symbol of any channel in the power transmission channel; the uplink control channel is mapped to the OFDM symbol of the uplink time slot in the transmission frame, and the interval between the guard interval and the OFDM symbol mapped to the uplink control channel is not mapped in the time domain OFDM symbol of the uplink control channel;

Send the OFDM symbol of the transmission frame;

Wherein, the guard interval is a guard interval that plays a protective role when the downlink time slot and the uplink time slot are switched. the

A communication device comprising:

The first mapping unit is configured to map the whole cell coverage channel or the high-power transmission channel to the OFDM symbol of the downlink time slot in the transmission frame, and the guard interval in the transmission frame is separated from the OFDM symbol in the time domain by an interval of Map the OFDM symbols of any channel in the whole cell coverage channel and high-power transmission channel;

The second mapping unit is configured to map the uplink control channel to the OFDM symbol of the uplink time slot in the transmission frame, and the interval between the guard interval and the OFDM symbol to which the uplink control channel is mapped is not mapped to the uplink control channel in the time domain OFDM symbols;

A sending unit, configured to send OFDM symbols of the transmission frame;

Wherein, the guard interval is a guard interval that plays a protective role when the downlink time slot and the uplink time slot are switched. the

A communication system comprising:

Terminal equipment, used to send uplink data and receive downlink data;

The base station is configured to receive the uplink data and send the downlink data, wherein, in the downlink data transmission frame, the whole cell coverage channel or the high-power transmission channel is mapped to the OFDM symbol of the downlink time slot in the transmission frame, and the The guard interval in the transmission frame is separated from the OFDM symbol in the time domain without mapping the OFDM symbol of any channel in the whole cell coverage channel and the high-power transmission channel; the uplink control channel is mapped to the uplink time slot in the transmission frame On the OFDM symbol, and the guard interval and the OFDM symbol mapped to the uplink control channel are separated in the time domain from the OFDM symbol that is not mapped to the uplink control channel;

Wherein, the guard interval is a guard interval that plays a protective role when the downlink time slot and the uplink time slot are switched. the

The beneficial effects of the present invention are as follows:

In the present invention, the full-cell coverage channel or the high-power transmission channel is mapped to the OFDM symbol of the downlink time slot in the transmission frame, and the interval between the guard interval in the transmission frame and the OFDM symbol in the time domain is not mapped to the full-cell coverage And the OFDM symbols of any channel in the high-power transmission channel, using this mapping method, can effectively avoid the interference of the downlink broadcast information sent by the base station of this cell and the downlink control information that needs to be covered by the whole cell on the uplink data sent by the neighboring outer cells In the present invention, the uplink control channel is mapped to the OFDM symbol of the uplink time slot in the transmission frame, and the interval between the guard interval in the transmission frame and the OFDM symbol mapped with uplink control information is not mapped to the uplink control channel in the time domain OFDM symbols, using this mapping method can effectively avoid the interference of the downlink broadcast information sent by the base station of the adjacent outer cell and the downlink control information that needs to be covered by the whole cell on the uplink data sent by the users of the cell, and also ensure the main control of the uplink. correct transmission of information. the

Description of drawings

Fig. 1 is the frame structure diagram of 3GPP36.211 system in the prior art;

Fig. 2 is the frame structure diagram of 802.16e system in the prior art;

Fig. 3 is a schematic structural diagram of a communication system in an embodiment of the present invention;

Fig. 4 is the implementation flowchart of sending data in the embodiment of the present invention;

Figure 5 is a schematic diagram of a three-sector cellular system in an embodiment of the present invention;

Fig. 6 is a kind of structural representation of transmission frame in the embodiment of the present invention;

Figure 7-Figure 11 is a schematic diagram of the relationship curve between the channel limit rate and DUP on the unit bandwidth;

FIG. 12 is another schematic structural diagram of a transmission frame in an embodiment of the present invention. the

Detailed ways

In this embodiment, in the downlink data transmission frame, the full-cell coverage channel or the high-power control channel is kept away from the guard interval in the time domain, and the uplink control channel is also kept away from the guard interval in the time domain. In addition, this embodiment is based on the largest system capacity Furthermore, a method for determining the guard interval is provided; in this embodiment, the full-cell coverage channel or the high-power channel mainly includes a synchronization channel, a broadcast channel, and a downlink control channel; the uplink control channel mainly includes a random access control channel. the

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings. the

Referring to FIG. 3, a communication system in this embodiment includes a terminal device 31 for sending uplink data and receiving downlink data; a base station 30 for receiving the uplink data sent by the terminal device 31, and sending to the terminal device 31 Downlink data; the base station 30 includes a first mapping unit 300, configured to map a cell-wide coverage channel or a high-power transmission channel to an OFDM symbol of a downlink time slot in a transmission frame, and the guard interval in the transmission frame is consistent with the The OFDM symbols are spaced in the time domain by OFDM symbols that are not mapped to any one of the full-cell coverage channel and the high-power transmission channel, and the number of OFDM symbols in the interval is at least one; the second mapping unit 301 is used to convert the uplink control The channel is mapped to the OFDM symbol of the uplink time slot in the transmission frame, and the OFDM symbol that is not mapped to the uplink control channel is separated between the guard interval and the OFDM symbol that maps the uplink control channel in the time domain, and the OFDM symbol that is not mapped to the interval is The number is at least one; the sending unit 302 is configured to send the OFDM symbol of the transmission frame; the receiving unit 303 is configured to receive the uplink data sent by the terminal device 31 . the

Referring to Fig. 4, the implementation process of sending data in the time division duplex system in the present embodiment is as follows:

Step 400: Map the full-cell coverage channel or the high-power transmission channel to the OFDM symbol of the downlink time slot in the transmission frame, and the interval between the guard interval in the transmission frame and the OFDM symbol in the time domain is not mapped to the full-cell coverage OFDM symbols of any one of the channel and the high-power transmit channel. the

Step 401: Map the uplink control channel to the OFDM symbol of the uplink time slot in the transmission frame, and the OFDM symbol not mapped to the uplink control channel is spaced between the guard interval and the OFDM symbol mapped to the uplink control channel in the time domain. the

Step 402. Send the OFDM symbol of the transmission frame. the

In the existing 802.16e system, the whole cell coverage channel or high-power transmission channel may be mapped to the last OFDM symbol in the downlink time slot of the downlink data transmission frame, and the uplink control channel is mapped to the first OFDM symbol in the uplink time slot. Therefore, in this embodiment, for the 802.16e system, the uplink control channel must be kept away from the guard interval in the time domain in the uplink time slot, and at the same time, the full cell coverage channel or the high-power control channel is placed in the time domain in the downlink time slot of the downlink data transmission frame. In the existing 3GPP LTE system, the full cell coverage channel or high-power transmission channel is mapped to the last OFDM symbol in the downlink time slot of the downlink data transmission frame, and the uplink control channel is mapped to the first OFDM symbol in the uplink time slot. OFDM symbols, therefore, in this embodiment, for the 3GPP LTE system, the downlink full-cell coverage channel or the high-power transmission channel is separated from the guard interval in the time domain to avoid the interference of the downlink data to the uplink data, and the uplink control channel can be further used In the time domain, it is far away from the guard interval to more effectively avoid the interference of downlink data between adjacent cells on uplink data. Therefore, in this embodiment, a better way to avoid the interference of downlink data between adjacent cells on uplink data is to separate the full cell coverage channel or high-power control channel from the protection channel in the time domain in the downlink time slot of the downlink data transmission frame. At the same time, the uplink control channel is kept away from the guard interval in the time domain in the uplink time slot. the

Refer to the schematic diagram of the three-sector cellular system shown in Figure 5, assuming that the cell radius R=5km, the base station transmit power P=43dBm, the cyclic prefix CP=5us, the effective transmission time of OFDM symbols T=1/15k=66.67us, downlink uplink conversion Time DUP=2R/C=33.5us (the guard interval is called DUP in this embodiment). the

Using the modified-Hata model, the calculation formula of the downlink path loss is as follows:

L(d)＝69.55+26.16logf-13.82log(h _te )+C _A +C _B +C _C +C _D +[44.9-6.55log(h _te )]log d(1)

in:

d is the distance between receiver and transmitter;

f is the carrier frequency;

h _te is the transmitter antenna height;

h _re is the receiver antenna height;

C _A is a big city environment, when the carrier frequency is greater than 300MHz, the influence of the antenna gain of the terminal equipment on the path loss, the calculation formula is: C _A =-3.2(log 11.75h _re ) ² +4.97;

C _B is the influence of area type on path loss, and the calculation formula is: C _B = -2(log10(f/28)) ² -5.4;

C _C is the influence of the carrier frequency on the path loss when the carrier frequency is greater than 900MHz, the calculation formula is:

C _C =23log10(f/883);

C _D is the influence of the curvature of the earth on the path loss, and the calculation formula is:

C _D ＝0d＜15km

C _D ＝-29.96+30.38*log10(d)-26.26*(log10(d)) ² +18.78*(log10(d)) ³ d＞15km;

Suppose base station antenna height h _te =30m, carrier frequency f=2000MHz, h _re =30m, the path loss model between base station and base station can be obtained from the above formula (1):

L(d)＝115.6+35.22logd d＜15km

L(d)＝85.64+65.6*log10(d)-26.26*(log10(d)) ² +18.78*(log10(d)) ³ d＞15km

Next, according to the downlink path loss obtained above, the cell capacity/bandwidth (i.e. spectrum efficiency) is further determined, and the calculation formula is as follows:

$\frac{\mathrm{<span\; class="notranslate">\; C</span>}}{\mathrm{<span\; class="notranslate">\; W</span>}}{<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; log</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\frac{{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; re</span>}}}{\mathrm{<span\; class="notranslate">\; I</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

in:

E _re is the received energy, the calculation formula is:

E _re = received power * time = (transmitted power - path loss + receiver gain) * time;

I is the total interference energy, the calculation formula is:

$I=\underset{j=1}{\overset{\mathrm{no}}{\mathrm{\&Sigma;}}}{I}_j,$ Wherein, the downlink of the cell of each layer of _Ij interferes with the uplink signal of this cell;

Using the system parameters shown in Table 1, the cell capacity/bandwidth with a cell radius of 5 km can be calculated through the above formula (2), as shown in Table 2,

parameters value Bandwidth W(MHz) 5

Thermal Noise Density (dBm/Hz) -174 Receiver Noise Figure (db) 5 Thermal noise power Pn(dBm) -108.7 Base station transmit power (dBm) 43 Cell radius (km) 5, 4, 3, 2, 1 Receiver gain (dBi) 14

Table 1

Layer n Outer Cell Distance between base stations (km) Path Loss (dB) Received power from an interfering base station to this base station (dBm) Propagation Delay (us) Effective interference time (us) Capacity/ Broadband C/W n=1 8.66 148.6 -91.6 28.9 0 1.176 n=2 17.32 162.3 -105.3 57.7 19.2 0.765 n=3 25.98 179.1 -122.1 86.6 49.1 0.736 n=4 34.64 192.9 -135.9 115 74.5 0.733 n=5 43.3 204.9 -147.9 144 103.5 0.733

Table 2

It can be seen from Table 2 that when the cell radius is 5 km, the distance between the base station and the base station is very large, and the corresponding path loss is also large, so there is basically no need to consider the impact of the base stations of the adjacent layers of cells with a cell radius exceeding 5 km on the cell. The interference of the uplink signal. Therefore, in this embodiment, when the cell radius is 1-5 km, the impact of the cells outside the nth layer on the spectrum efficiency of the cell is considered. The calculated data are shown in Table 3, where R is the cell radius, and C/W is the spectrum efficiency, n is the layer number of the outer cell;

table 3

It can be seen from Table 3 that the number of layers of adjacent outer cells that need to be considered for different cell radii, and the corresponding effective interference time is the transmission delay time minus the guard interval duration and cyclic prefix duration. The calculation results are shown in Table 4:

the Need to consider the number of outer cell layers Effective interference time (us) R＝5km 4 74.5 R＝4km 4 60.6 R＝3km 4 44.2 R＝2km 7 62.5 R＝1km 8 34.5

Table 4

Taking the synchronization channel as an example, when DUP=2*R/C, the interval between the downlink OFDM symbol mapped to the synchronization channel and the DUP by an OFDM symbol not mapped to the synchronization channel will also reduce the interference time, but the interference cannot be effectively avoided; It can be seen from Table 4 that no matter the cell radius is within 5km, the maximum effective interference time of the base station of the outer cell to the uplink signal of the cell is 74.5us, so the interval between the downlink OFDM symbol and the DUP mapped to the synchronization channel is two The OFDM symbols that are not mapped to the synchronization channel can effectively avoid the interference of the downlink synchronization information on the uplink data of adjacent cells. Mapping the OFDM symbols of the uplink control information can effectively avoid the interference of the downlink data of adjacent cells on the uplink control information of the cell; the interval between the mapped OFDM symbols in the time domain and the DUP is shown in Figure 6. the

The configuration of the DUP has a great impact on the system capacity. If the DUP is too small, it will cause large interference and cause the system capacity to decrease; if the DUP is too large, it will waste bandwidth and time, and the system capacity will also decrease; therefore An appropriate DUP is needed to maximize the system capacity. This embodiment provides a method for determining the DUP according to the maximum system capacity. At this time, only the impact of interference from adjacent outer cells on the system capacity is considered. the

The capacity formula on the unit bandwidth is:

Among them, t ₁ is the effective interference time, and t ₀ is the propagation delay from the base station of the outermost cell to the base station of the cell considered.

Through the simulation of the matlab programming system, the relationship curve between the channel limit rate and DUP per unit bandwidth can be obtained as shown in Figure 7-Figure 11, and the relationship between the cell radius and DUP can be obtained, as shown in Table 5 :

Cell radius R(km) DUP(us) R＝5km 54 R＝4km 42 R＝3km 47 R＝2km 53.4 R＝1km 34

table 5

It can be concluded from Table 5 that when the method of maximizing capacity is used to determine the DUP, an unmapped full-cell coverage and The OFDM symbol of any channel in the high-power transmission channel can avoid the interference of downlink control information and broadcast information on the uplink control information of adjacent cells. Similarly, the first OFDM symbol in the mapping uplink control information (important information) There is an OFDM symbol that does not map uplink control information between each OFDM symbol and the DUP, which can avoid the interference of the downlink data of adjacent cells on the uplink control information of this cell, and the distance between the mapped OFDM symbol and the DUP in the time domain The schematic diagram of the interval is shown in Figure 12. the

For downlink channels that can apply soft frequency multiplexing technology, such as physical random access channel (PRACH, Physical Random Access Channel) and synchronization channel (SCH, Synchronization Channel), etc., soft frequency multiplexing technology can be used in this embodiment to send the mapping The OFDM symbol of this channel can more effectively reduce the interference of the downlink signal of the local cell to the uplink signal of the outer cell. the

The present invention is applicable to all time-division duplex systems. By adopting the present invention, the interference of the downlink signal of the local cell to the uplink signal of the adjacent cell and the interference of the downlink signal of the adjacent cell to the uplink signal of the own cell can be effectively avoided, and the transmission of important uplink control information is ensured. reliability and improved system performance. the

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention also intends to include these modifications and variations. the

Claims (21)

1. send the method for data in the tdd systems, it is characterized in that, comprise step:

Full sub-district covering channel or high-power send channel are mapped on the OFDM symbol of descending time slot in the transmission frame, and the protection in the described transmission frame is not shone upon the OFDM symbol that full sub-district covers arbitrary channel in channel and the high-power send channel at interval with described OFDM symbol at interval on time domain;

Ascending control channel is mapped on the OFDM symbol of ascending time slot in the described transmission frame, and described protection at interval with the OFDM symbol of the mapping uplink control channel OFDM symbol of mapping uplink control channel not at interval on time domain;

Send the OFDM symbol of described transmission frame;

The protection that plays a protective role when wherein, described protection is descending time slot and ascending time slot conversion at interval at interval.

2. the method for claim 1 is characterized in that, described full sub-district covers channel or high-power send channel is a synchronizing channel, perhaps is broadcast channel, perhaps is down control channel.

3. method as claimed in claim 2 is characterized in that, described protection duration is at interval determined according to radius of society.

4. method as claimed in claim 3 is characterized in that, described protection duration at interval is 2 times the radius of society and the ratio of the light velocity.

5. method as claimed in claim 4; it is characterized in that the protection in the described transmission frame is at least two with the OFDM symbol that shines upon full sub-district covering channel or high-power send channel number that does not shine upon the OFDM symbol of arbitrary channel in full sub-district covering channel and the high-power send channel at interval on time domain at interval.

6. method as claimed in claim 4 is characterized in that, the protection interval in the described transmission frame is at least two with the number of OFDM symbol OFDM symbol of the not mapping uplink control channel at interval on time domain of mapping uplink control channel.

7. method as claimed in claim 2 is characterized in that, described protection duration is at interval determined according to system's heap(ed) capacity.

8. method as claimed in claim 7; it is characterized in that the protection in the described transmission frame is one with the OFDM symbol that shines upon full sub-district covering channel or high-power send channel number that does not shine upon the OFDM symbol of arbitrary channel in full sub-district covering channel and the high-power send channel at interval on time domain at interval.

9. method as claimed in claim 7 is characterized in that, the protection interval in the described transmission frame is one with the number of OFDM symbol OFDM symbol of the not mapping uplink control channel at interval on time domain of mapping uplink control channel.

10. send the method for data in the tdd systems, be applied to 3GPP LTE long evolving system, it is characterized in that, comprise step:

Full sub-district covering channel or high-power send channel are mapped on the OFDM symbol of descending time slot in the transmission frame, and the protection in the described transmission frame is not shone upon the OFDM symbol that full sub-district covers arbitrary channel in channel and the high-power send channel at interval with described OFDM symbol at interval on time domain; Ascending control channel is mapped on the OFDM symbol of ascending time slot in the described transmission frame, and described protection at interval with the OFDM symbol of the mapping uplink control channel OFDM symbol of mapping uplink control channel not at interval on time domain;

Send the OFDM symbol of described transmission frame;

The protection that plays a protective role when wherein, described protection is descending time slot and ascending time slot conversion at interval at interval.

11. method as claimed in claim 10 is characterized in that, described full sub-district covers channel or high-power send channel is a synchronizing channel, perhaps is broadcast channel, perhaps is down control channel.

12. method as claimed in claim 11 is characterized in that, described protection duration is at interval determined according to radius of society.

13. method as claimed in claim 12 is characterized in that, described protection duration at interval is 2 times the radius of society and the ratio of the light velocity.

14. method as claimed in claim 13; it is characterized in that the protection in the described transmission frame is at least two with the OFDM symbol that shines upon full sub-district covering channel or high-power send channel number that does not shine upon the OFDM symbol of arbitrary channel in full sub-district covering channel and the high-power send channel at interval on time domain at interval.

15. method as claimed in claim 14 is characterized in that, the protection interval in the described transmission frame is at least two with the number of OFDM symbol OFDM symbol of the not mapping uplink control channel at interval on time domain of mapping uplink control channel.

16. method as claimed in claim 11 is characterized in that, described protection duration is at interval determined according to system's heap(ed) capacity.

17. method as claimed in claim 16; it is characterized in that the protection in the described transmission frame is at least one with the OFDM symbol that shines upon full sub-district covering channel or high-power send channel number that does not shine upon the OFDM symbol of arbitrary channel in full sub-district covering channel and the high-power send channel at interval on time domain at interval.

18. method as claimed in claim 16 is characterized in that, the protection interval in the described transmission frame is at least one with the number of OFDM symbol OFDM symbol of the not mapping uplink control channel at interval on time domain of mapping uplink control channel.

19. a communication equipment is characterized in that, comprising:

First map unit, be used for full sub-district is covered the OFDM symbol that channel or high-power send channel are mapped to the transmission frame descending time slot, and the protection in the described transmission frame is not shone upon the OFDM symbol that full sub-district covers arbitrary channel in channel and the high-power send channel at interval with described OFDM symbol at interval on time domain;

Second map unit is used for ascending control channel is mapped to the OFDM symbol of described transmission frame ascending time slot, and described protection at interval with the OFDM symbol of the mapping uplink control channel OFDM symbol of mapping uplink control channel not at interval on time domain;

Transmitting element is used to send the OFDM symbol of described transmission frame;

The protection that plays a protective role when wherein, described protection is descending time slot and ascending time slot conversion at interval at interval.

20. a communication system is characterized in that, comprising:

Terminal equipment is used to send upstream data and downlink data receiving;

The base station, be used to receive described upstream data and send described downlink data, wherein, in the downlink data transmission frame, full sub-district covering channel or high-power send channel are mapped on the OFDM symbol of descending time slot in the transmission frame, and the protection in the described transmission frame is not shone upon the OFDM symbol that full sub-district covers arbitrary channel in channel and the high-power send channel at interval with described OFDM symbol at interval on time domain; Ascending control channel is mapped on the OFDM symbol of ascending time slot in the described transmission frame, and described protection at interval with the OFDM symbol of the mapping uplink control channel OFDM symbol of mapping uplink control channel not at interval on time domain;

The protection that plays a protective role when wherein, described protection is descending time slot and ascending time slot conversion at interval at interval.

21. communication system as claimed in claim 20 is characterized in that, described base station comprises:

First map unit, be used for full sub-district is covered the OFDM symbol that channel or high-power send channel are mapped to the transmission frame descending time slot, and the protection in the described transmission frame is not shone upon the OFDM symbol that full sub-district covers arbitrary channel in channel and the high-power send channel at interval with described OFDM symbol at interval on time domain, the number of the OFDM symbol at described interval is at least one;

Second map unit is used for ascending control channel is mapped to the OFDM symbol of described transmission frame ascending time slot, and described protection at interval with the OFDM symbol of the mapping uplink control channel OFDM symbol of mapping uplink control channel not at interval on time domain;

Transmitting element is used to send the OFDM symbol of described transmission frame.

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