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A technology of time-division duplex system and data transmission method, which is applied in time-division multiplexing usage, transmission system, radio transmission system, etc., and can solve the problems of inflexible coverage support, large level difference between levels, waste of wireless resources, etc.
Active Publication Date: 2012-06-27
DATANG MOBILE COMM EQUIP CO LTD
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[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.
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Embodiment 1
[0092] 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:
[0093] Step 801, according to any compatibility requirement with the TD-SCDMA system, the corresponding setting includes all possible special area configurations, and save the corresponding relationship between each compatibility requirement and a group of special area configurations in the base station.
[0094] In practical applications, there may be TD-SCDMA networks within the coverage area of the base station of the LTE TDD system. To ensure the signal quality of the two networks, when setting the lengths of GP time slots, DwPTS time slots and UpPTS time slots, two system compatibility. The so-called compatibility means that in the area where the two systems coexist, the uplink and downlink relations of the two systems need to be consistent, that is, the uplink...
Embodiment 2
[0134] Figure 13 It is a specific flowchart of the data transmission method in Embodiment 2 of the present invention. like Figure 13 As shown, the method includes:
[0135] Step 1301, according to any compatibility requirements and restrictions with the TD-SCDMA system, correspondingly set a group of special area configurations, and save the corresponding relationship between each compatibility requirement and a group of special area configurations.
[0136] In this embodiment, restrictive conditions are set in advance to reduce the number of special area configurations.
[0137] Specifically, the set restriction condition may be to limit the length of the UpPTS time slot. Because under the premise of guaranteeing coverage, if the short CP is used when the minimum GP time slot length is used, as shown in Table 1, the UpPTS time slot length may be 2, 6, 7 or 11 symbols; if the long CP is used, then as As shown in Table 2, the UpPTS slot length may be 2, 5, 6 or 9 symbols....
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Abstract
The invention discloses a method for transmitting data of a time division duplex system. The method comprises the following steps: a group of special area configurations comprising a protective gap GP time slot length, a DwPTS time slot length and a UpPTS time slot length with a symbol length as a unit are correspondingly set according to any compatibility requirement with a TD-SCDMA system in advance, and a corresponding relationship between each compatibility requirement and the group of special area configurations is stored in a base station; the base station determines a group of special area configurations currently corresponding to the compatibility requirement of the TD-SCDMA system according to the stored corresponding relationship; one of the group of the special area configurations is selected according to a coverage range, and the selected special area configuration is transmitted to user equipment; the user equipment and the base station construct a wireless frame field for data transmission according to the selected special area configuration. The invention also discloses a time division duplex system. By adopting the invention, different rate coverage with finer granularity can be supported, wireless resources are saved, and transmission efficiency is improved.
Description
technical field [0001] The invention relates to a long-term evolution scheme of a time-division duplex system, in particular to a time-division duplex system and a data transmission method thereof. 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...
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