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System and method for transmission of data

A data transmission method and technology of a data transmission system, which are applied in the direction of transmission control/equalization, communication between multiple stations, and selection of devices, etc. Inaccurate transmission power and other problems, to achieve the effect of accurate power control and improved throughput

Inactive Publication Date: 2008-10-08
ZTE CORP
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AI Technical Summary

Problems solved by technology

However, in the case of discontinuous transmission, the channel condition of the last frame of user data transmission has changed greatly, so the closed-loop power control cannot play a role
Specifically, the introduction of 5ms TTI can shorten the delay. However, compared with 20ms scheduled transmission, the initial transmission power of the user determined at this time is not accurate when the power interference of adjacent cells cannot be well predicted. , resulting in significantly lower closed-loop power control performance

Method used

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  • System and method for transmission of data
  • System and method for transmission of data
  • System and method for transmission of data

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Embodiment Construction

[0016] refer to figure 1 , which represents a schematic diagram of a data transmission system according to the present invention. The data transmission system 100 includes at least one base station and at least one user terminal (UE). However, for simplicity, figure 1 The data transmission system in contains only one base station and multiple UEs.

[0017] In TD-SCDMA uplink enhancement technology, there is the concept of transport block. The transport block refers to the basic exchange unit between the physical layer and the media access control sublayer (MAC sublayer), and the physical layer adds a cyclic redundancy check (CRC) to each transport block. A set of multiple transport blocks exchanged simultaneously on the same transport channel between the physical layer and the MAC sublayer is called a transport block set (TBS). The TTI refers to the transmission time interval, which is defined as the arrival time interval of a transport block set (TBS), which is equal to t...

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Abstract

The invention provides a method for data transmission, which adopt 5msTTI to transmit the data and takes 20ms time spacing of continuous 4 TTIs as a entire scheduling period, the method comprises the following steps that: a UE utilizes an initial transmission power to transmit the data to a base station; after the first TTI, the base station sends a first TPC to the UE, the UE performs a first closed ring power control according to value of the TPC in order to regulate the transmission power of the UE, the UE uses the regulated transmission power to transmit the data to the base station; after the second TTI, the step which is same as the step after the first TTI is performed; after the third TTI, the step which is same as the step after the first TTI is performed; and after the fourth TTI, the UE utilizes the finally-regulated transmission power to transmit the data to the base station. The invention also provides a data transmission system.

Description

technical field [0001] The invention relates to a data transmission method and a data transmission system in the field of wireless communication, in particular to a data transmission method and a data transmission system using a transmission structure of four consecutive 5ms transmission time intervals (TTIs) in TD-SCDMA uplink enhancement technology. Background technique [0002] With the continuous increase of people's demand for mobile data services, the existing mobile phone system hopes to provide users with an increasing number and types of data services, such as: online games, VoIP services, etc., and these data services require higher services Quality of Service (QoS). In order to meet the requirements of QoS, and considering the near-far effect, the uplink power control range is large enough, etc., so WCDMA uplink adopts power control. TD-SCDMA is similar to WCDMA system and also adopts power control. Open-loop power control is used for initial access, and closed-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/22H04B7/005H04Q7/38H04B7/26
Inventor 王亚峰刘兵王凯张京马志锋刁心玺
Owner ZTE CORP
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