LTE-TDD system ACK/NACK transmission method and apparatus

A transmission method and technology of a transmission device, which are applied in the LTE field of mobile communication, can solve the problem of inability to establish a one-to-one correspondence between uplink and downlink, and achieve the effects of alleviating the tension of allocation, multiplying the spread spectrum gain, and improving reliability.

Active Publication Date: 2011-09-28
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

However, for the TDD system, the uplink and downlink adopt a variable asymmetric structure to support asymmetric services. This asymmetric structure makes it impossible to establish a simple one-to-one correspondence between the uplink and downlink.

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  • LTE-TDD system ACK/NACK transmission method and apparatus
  • LTE-TDD system ACK/NACK transmission method and apparatus
  • LTE-TDD system ACK/NACK transmission method and apparatus

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Embodiment Construction

[0028] The present invention proposes an ACK / NACK feedback scheme aiming at the characteristics of the TDD system, especially when there are more downlink subframes than uplink subframes, to ensure effective transmission of ACK / NACK signaling and lower PAPR of uplink signals. In order to ensure a lower PAPR, it can be understood here: to ensure that the channel for transmitting ACK / NACK is continuous in the frequency domain, and use the same ZC (Zadoff-Chu) sequence; or the same ZC sequence with different shifts Stacking, doing so only increases PAPR linearly, still keeps PAPR in the lower range.

[0029] As introduced above, for the TDD system, due to the asymmetric characteristics of the uplink and downlink, it cannot always establish a one-to-one correspondence like the FDD system. see Figure 4 , when the downlink subframe is less than or equal to the uplink subframe, the mapping relationship between the transmission ACK / NACK and the service subframe can be determined by ...

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Abstract

The invention discloses a method for transmitting ACK / NACK in an LTE-TDD system, comprising: at least two physical resource blocks are merged into a super physical resource block according to the proportion of ascending subframe and descending subframe; the mapping relation between the descending subframe and the super physical resource block used for feedback of the ACK / NACK is preset; after UE receives the descending subframe, the feedback of the ACK / NACK is carried out on the super physical resource block corresponding to the descending subframe. By expanding a hopping sequence, the methodcan ensure the transmission is carried out on only one super hopping sequence under the condition of a plurality of feedbacks of the ACK, thus guaranteeing lower PAPR. Furthermore, the reliability ofthe signaling transmission of the ACK / NACK, and subdistrict interference is reduced. The invention also correspondingly provides a device for transmitting the ACK / NACK in the LTE-TDD system.

Description

technical field [0001] The present invention relates to the technical field of LTE (Long Time Evolution, long-term evolution) of mobile communication, in particular to an LTE-TDD (Time Division Duplex, time division duplex) system uplink ACK (acknowledge, confirmation information) / NACK (Non-acknowledge, Unconfirmed information) transmission method and device. Background technique [0002] The LTE system supports two frame structures. The first type of frame structure is applicable to TDD and FDD (Frequency Division Duplex, Frequency Division Duplex) systems. For this type of frame structure, see figure 1 , the frame length of this type of wireless frame is 10ms, and consists of 20 time slots, each time slot length is 0.5s, as shown in the figure, each time slot is marked as 0 to 19. Two consecutive time slots are defined as a subframe, and subframe i is composed of time slots 2i and (2i+1), where i=0, 1...9. For the FDD system, since the uplink and downlink are separated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L1/18H04L5/26
Inventor 索士强肖国军缪德山
Owner DATANG MOBILE COMM EQUIP CO LTD
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