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Data transmission method and apparatus for time division duplexing system

A technology of time division duplex system and data transmission method, applied in transmission system, radio transmission system, communication between multiple stations, etc. The effect of saving wireless resources, reducing adjustment granularity, and improving transmission efficiency

Active Publication Date: 2013-03-20
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] When using the above method for data transmission, since the adjustment granularity of the GP length is one uplink time slot, when different levels of coverage are supported, the level difference between levels is relatively large, and the support for coverage is not flexible enough, resulting in waste of wireless resources. Small transfer efficiency
For example, for a cell with a coverage area of ​​50km, it is necessary to select the third GP length and the corresponding frame structure for data transmission. At this time, a large part of the time slot is actually wasted as a guard interval, which actually affects the transmission efficiency.

Method used

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  • Data transmission method and apparatus for time division duplexing system
  • Data transmission method and apparatus for time division duplexing system
  • Data transmission method and apparatus for time division duplexing system

Examples

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Embodiment 1

[0078] Figure 8 It is a specific flow chart of the data transmission method of the time division duplex system in the first embodiment of the present invention. like Figure 8 As shown, the method includes:

[0079] Step 801, calculate the required GP length according to the coverage of the base station.

[0080] In this step, the way to calculate the required GP length is: T GP =2*R cell / C.

[0081] Step 802: Set the lengths of GP time slots, DwPTS time slots and UpPTS time slots according to the GP length.

[0082] When setting the length of the GP time slot, as mentioned above, the time length occupied by the OFDM symbol is used as a unit to allocate, and the length of the GP time slot after allocation is greater than or equal to the GP length calculated in step 801 . When setting the length of GP time slot, DwPTS time slot and UpPTS time slot considering the coverage alone, set the length of GP time slot as small as possible, and P-SCH is implemented in DwPTS time ...

Embodiment 2

[0114] Figure 11 This is a specific flowchart of the data transmission method of the time division duplex system in the second embodiment of the present invention. like Figure 11 As shown, the method includes:

[0115] Step 1101, according to different coverage requirements and compatibility requirements for the TD-SCDMA system in advance, establish the corresponding relationship between the GP time slots, DwPTS time slots and UpPTS time slot lengths corresponding to different coverage ranges and compatibility requirements of the base station, and Save the corresponding relationship.

[0116] In this step, the corresponding relationship is established according to the method described in step 802a of the first embodiment. As mentioned earlier, there are many setup scenarios that actually exist. This embodiment provides a simplified solution. In the established corresponding relationship, not all setting solutions are included, but some of the setting solutions are select...

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Abstract

The invention discloses a data transmission method of a time division duplex system, which comprises the following steps: a base station sets the length of the GP time slot of a protection interval by using the length of an OFDM symbol as a unit according to the current coverage range in the time range of a special zone of a radio half frame, sets the lengths of a DWPTS time slot and an UpPTS time slot, and sends set results to a user device; and the user device and the base station carry out data transmission by using the radio half frame. The invention also discloses a time division duplex system. When the invention is used, the finer granularity coverage of different grades can be supported, radio resources are saved, and the transmission efficiency is increased.

Description

technical field [0001] The invention relates to a long-term evolution scheme of a time-division duplex system, in particular to a data transmission method of the time-division duplex system. Background technique [0002] The third-generation mobile communication system (3G) adopts CDMA multiple access mode, supports multimedia services, and has high competitiveness. In order to ensure that such competitiveness is maintained in a longer period of time, the 3GPP has initiated a research project on Long Term Evolution (LTE) of 3G radio interface technology. [0003] Currently, the LTE system supports two types of frame structures. TD-SCDMA is the only standard that adopts time division duplex (TDD) among the three major international standards of the third generation mobile communication system. In the long-term evolution scheme of TD-SCDMA (LTE TDD), its preferred frame structure is the same as TD - The second type of frame structure compatible with SCDMA system, such as fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04B7/204
Inventor 索士强肖国军潘学明孙韶辉唐海
Owner DATANG MOBILE COMM EQUIP CO LTD
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