Hybrid automatic retransmission method, apparatus and system in FDD-LTE network

A hybrid automatic retransmission and network technology, applied in the communication field, can solve problems such as limiting FDD-LTE network deployment scenarios, and achieve the effect of flexible scheduling and deployment

Active Publication Date: 2014-08-20
CHINA TELECOM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the fixed interval limits the deployment scenarios of the FDD-LTE network in the application of multi-layer and multi-cell large-scale antenna joint processing technology

Method used

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  • Hybrid automatic retransmission method, apparatus and system in FDD-LTE network
  • Hybrid automatic retransmission method, apparatus and system in FDD-LTE network
  • Hybrid automatic retransmission method, apparatus and system in FDD-LTE network

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125]Modify the DCI signaling, use the UL index (2 bits) item of FDD LTE spare in DCI0 to indicate the sending time of FDD LTE downlink PHICH information, and flexibly configure the sending time of downlink PHICH, the value of 2bit is 00 (k=4ms), 01 (k=6ms), 10 (k=8ms), 11 (k=12ms or reserved), so that the transmission delay of PHICH information supports 4ms, 6ms, 8ms, 12ms, etc. respectively.

Embodiment 1

[0126] Embodiment 1 flow process is as follows:

[0127] Step 1: When the base station performs configuration, it first judges whether the current user terminal is the initial transmission. If it is judged that the user terminal is the first uplink transmission, the base station selects the user terminal uplink data feedback information ACK / NACK according to the type of the base station (as shown in Table 1 above). The sending time of k=k 0 , and go to step 5. If it is judged that the user terminal is not the first uplink transmission, the base station judges whether the following conditions are met: base station uplink transmission resource utilization rate ≥ 70%, user terminal uplink data transmission accuracy rate > 95% and k ≤ 20ms. If yes, go to step 2; otherwise, go to step 3.

[0128] Step 2: Add 4 ms to the current ACK / NACK sending time k, and then execute Step 5.

[0129] Step 3: The base station judges whether the uplink transmission resource utilization rate of t...

Embodiment 2

[0137] The DCI signaling is modified, and a new item PHICH Timing (2 bits) is added in DCI0 to indicate the PHICH transmission time.

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Abstract

The invention discloses a hybrid automatic retransmission method, apparatus and system in an FDD-LTE network. The hybrid automatic retransmission method comprises: configuring a transmission time interval k, the transmission time interval k being a time interval between the time when a base station receives PUSCH information sent by a user terminal and the time when the base station sends PHICH information to the user terminal; sending indication information to the user terminal at an i-th download subframe, the indication information comprising the transmission time interval k; receiving the PUSCH information sent by the user terminal on an (i+4)-th uplink subframe; sending the PHICH information to the user terminal on an (i+4+k)-th downlink subframe; and if the PHICH information comprises a negative acknowledgement message, receiving the PUSCH information retransmitted by the user terminal on an (i+4+k+4)-th uplink subframe, such that the time for sending the PHICH information can be flexibly scheduled and deposed, and LTE can more flexibly support the application scenes of a multilayer/multi-cell large scale antenna combined processing technology.

Description

technical field [0001] The present invention relates to the communication field, in particular to a hybrid automatic retransmission method, device and system in an FDD-LTE (Frequency Division Duplexing-Long Term Evolution, Frequency Division Duplexing Long Term Evolution) network. Background technique [0002] A Hybrid Automatic Repeat Request (HARQ for short) technology is a transmission technology widely used in mobile communications. In this technology, the data sender retransmits the erroneous data in a pre-agreed packet format according to the ACK (Acknowledgment, confirmation) / NACK (Negative Acknowledgment, denial) information fed back by the receiver, so as to help the receiver recover the erroneous data , improve data transmission efficiency. [0003] According to 3GPP (The3 rd The Generation Partnership Project (3rd Generation Partnership Project) TS36.213 specification specifies the channel timing relationship between the base station (evolved Node B, referred to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L1/00
Inventor 蒋峥毕奇陈鹏佘小明李欣
Owner CHINA TELECOM CORP LTD
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