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A data transmission method and system

A data transmission method and a technology of a data transmission system, which are applied in the field of communication, can solve the problems of reducing TTIBundling control overhead, limitations, poor flexibility, etc., and achieve the effect of improving resource utilization

Active Publication Date: 2018-06-19
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] figure 1 In the scenario shown, the number of resource blocks in each TTI in TTI Bundling is equal. Although the equal number of resource blocks can simplify the control process of TTI Bundling and reduce the control overhead of TTI Bundling, each TTI in TTIBundling The number of resource blocks in must be equal to cause the following problem: the number of resource blocks transmitted by each TTI Bundling is the number of resource blocks of each TTI*TTIBundling size, resulting in the transmission block size (Transmission Block Size, TBS) that can be transmitted in TTI Bundling ) is limited, which has little impact on the VoIP service, because the TBS of the VoIP service is designed at the full rate. For example, TBS=328 corresponds to the full rate of the AMR encoder. There are all settings, but for data services, due to its wider rate range, it can reach from 1kb / s to 1Mb / s, and more types of TBS are required. Therefore, when TTI Bundling is applied to data transmission, the flexibility of TBS selection Poor, may result in lower resource utilization

Method used

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Embodiment 1

[0072] In this embodiment, the number of TTIs included in the TTI Bundling is N=4, and the four TTIs in the TTI Bundling are consecutive. In this embodiment, 18 RBs are allocated to 4 TTIs in TTI Bundling, that is, K=18. In an LTE system with a bandwidth of 10MHz, the corresponding system bandwidth configuration N RB is 50, that is, 50 resource blocks (Resouce Block, RB) (resource blocks here refer to two resource blocks in two time slots, such as image 3 shown. Because the two resource blocks in the two time slots must be allocated simultaneously during resource allocation, and both are indicated by a logical resource block index, so if there is no ambiguity, both are referred to as resource blocks, and will not be described in detail).

[0073] According to the previous description, the allocation method of K resource blocks in N TTIs is as follows:

[0074] When K is divisible by N:

[0075] Among the N TTIs in TTI Bundling, K / N resource blocks are allocated in each TTI; ...

Embodiment 2

[0094] Image 6 It is a schematic diagram of TTI Bundling transmission in Embodiment 2 of the present invention. In this embodiment, the number of TTIs included in TTIBundling transmission is fixed, for example, 4, but the 4 TTIs in time interval bundling are discontinuous. Due to scheduling conflicts, the first Three TTIs cannot be allocated, so the first three TTIs and the fifth TTI together form a TTI Bundling, which still bundles 4 TTIs for transmission, but the time domain width is 5 TTIs, which increases the flexibility of resource scheduling .

[0095] The specific allocation principle and version generation principle of this embodiment are similar to the first embodiment. In order to improve the transmission efficiency, a suitable TBS is configured for the data to be sent. Image 6 A total of 18 RBs are allocated to the 4 TTIs in the TTI Bundling, in which the first two TTIs occupy 5 RBs respectively, and the last two TTIs occupy 4 RBs respectively.

Embodiment 3

[0097] Figure 7 It is a schematic diagram of TTI Bundling transmission in Embodiment 3 of the present invention. In this embodiment, the number of TTIs included in TTIBundling transmission is fixed, for example, 4, but the 4 TTIs in time interval bundling are discontinuous. In order to increase the time diversity gain obtained by TTIBundling during transmission, 4 TTIs are sent in 8 TTIs with an interval of 1 TTI.

[0098] The specific allocation principle and version generation principle of this embodiment are similar to the first embodiment. In order to improve the transmission efficiency, a suitable TBS is configured for the data to be sent. Figure 7 A total of 18 RBs are allocated to the 4 TTIs in the TTI Bundling, where the first two TTIs occupy 5 RBs respectively, and the last two TTIs occupy 4 RBs respectively.

[0099] It should be noted that the interval of 1 TTI is just an example, and the interval of multiple TTIs is also possible, the difference lies in the diff...

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Abstract

The invention discloses a data transmission method, which includes: according to the transmitted data, determining the number of resource blocks used to transmit the data in each TTI in TTI Bundling, and generating at least one HARB Transmission request (HARQ) version; according to the determined number of resource blocks used to transmit the data in each TTI in the TTI Bundling, transmit the generated HARQ version through TTI Bundling. The invention also correspondingly discloses a data transmission system. Through the scheme of the present invention, during data transmission, the number of resource blocks in each TTI in the TTI Bundling can be unequal, so that the transport block size (TBS) can be flexibly selected, and resource utilization can be improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a data transmission method and system. Background technique [0002] With the rapid development of wireless communication technology, limited spectrum resources have gradually become the main factor restricting the development of wireless communication, but it is the limited spectrum resources that stimulate the emergence of new technologies. Capacity and coverage are two important performance indicators in a wireless communication system. In order to increase capacity, co-frequency networking is often used. However, co-frequency networking increases inter-cell interference, resulting in reduced coverage performance. [0003] In the Long Term Evolution (LTE) system, the Orthogonal Frequency Division Multiple Access (OFDMA) technology is used in the downlink, which can significantly reduce the interference in the cell. In the high-frequency network, the inter-cell interference (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/00
Inventor 关艳峰陈宪明罗薇袁弋非左志松
Owner ZTE CORP