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Non-adaptive repeat power control method and device for long term evolution (LTE) terminal

A non-adaptive retransmission and power control technology, applied in the field of communications, can solve the problems of wasting wireless resources, reducing throughput, increasing transmission delay, etc., to improve the probability of successful retransmission, improve system throughput, and improve The effect of SINR

Inactive Publication Date: 2011-10-05
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for non-adaptive retransmission, although the base station may issue the power value that the terminal needs to adjust through DCI3 / 3A, due to the limited number of terminals it can contain (DCI3 can contain at most terminal adjustment value, DCI3A can contain up to L format0 The adjusted value of a terminal, where L format0 is the bit number of DCI0), and is related to the base station scheduling algorithm, it cannot be guaranteed that each terminal can obtain its own TPC adjustment value
At this time, the terminal may not obtain a high SINR for correct decoding by the base station after repeated retransmissions, which wastes the wireless resources for retransmission, increases the transmission delay, and reduces the throughput rate.

Method used

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  • Non-adaptive repeat power control method and device for long term evolution (LTE) terminal

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example 1

[0059] refer to figure 2 As shown, taking the FDD system as an example, there are 8 uplink HARQ processes, which are numbered from 0 to 7 in turn, and 1 is added to each TTI (Transmission Time Interval, transmission time interval) process number. It is assumed that the terminal uses an absolute value power control mode.

[0060] Assuming that the UE sends a packet of newly transmitted PUSCH data in the process of HARQ ID=0, after 4 subframes, it parses NACK through PHICH, indicating that the transmission of the newly transmitted data fails. Since DCI0 in the PDCCH is not detected in this subframe, the UE A non-adaptive HARQ retransmission will be performed. That is, retransmission is performed according to the newly configured modulation and coding method and radio resources. If the TPC value that matches itself is not found in the DCI3 / 3A of the PDCCH, in the existing technology, the terminal does not have TPC adjustment when retransmitting value, may be sent with less pow...

example 2

[0069] Taking the FDD system as an example, it is assumed that the terminal adopts a cumulative power control method. That is, the current transmission is affected by the power value sent before, and the terminal needs to make a fine-tuning value according to the TPC instruction on the basis of the previous power.

[0070] Assuming that a new transmission is sent in subframe i, if the new transmission fails, its retransmission occurs in i+8 subframe. According to the agreement, the cumulative power adjustment value f(i)=f(i-1)+δ PUSCH (i-K PUSCH ), K PUSCH is a parameter. For the FDD system, the value is fixed at 4. where δ PUSCH (i) represents the adjustment value of the TPC in DCI0 / 3 / 3A corresponding to the i-th subframe, which can be obtained by looking up Table 1 or Table 2. Wherein, Table 1 is the power adjustment value corresponding to TPC in DCI0 / 3 in the prior art, and Table 2 is the power adjustment value corresponding to TPC in DCI3A in the prior art.

[0071] ...

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Abstract

The invention provides a non-adaptive repeat power control method and a non-adaptive repeat power control device for a long term evolution (LTE) terminal. The method comprises that: when performing new physical uplink shared channel (PUSCH) transmission, the terminal judges whether a current power control mode is an accumulative mode or an absolute value mode, counts adjusted transmit power control (TPC) values of each hybrid automatic repeat request (HARQ) processes after the new transmission as new adjusted TPC values if the current power control mode is the accumulative mode, and saves opposite numbers of the adjusted TPC values indicated by downlink control information (DCI) 0 in the new transmission as the new adjusted TPC values; when judging non-adaptive repeat is required, the terminal adds an incremental adjusted value to a repeat power value if judging the new TPC adjusted values are lower than a preset threshold value; and the terminal performs the non-adaptive HARQ repeat by using the power value to which the incremental adjusted value is added. The repeat success probability can be increased by properly adjusting the repeat power.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for power control of a terminal in an LTE (Long Term Evolution, Long Term Evolution) system when performing non-adaptive retransmission. Background technique [0002] In wireless communication systems, uplink power control plays a very important role. On the one hand, it requires the user terminal (User Equipment, referred to as UE) to have sufficient transmit power to achieve the required QoS (Quality of Service), and at the same time To reduce the interference between users in the system, overcome the influence of path loss, fast fading and shadow fading in the wireless environment on wireless signal propagation, and save the energy consumption of the terminal as much as possible. Power control plays a very important role in improving the performance of wireless systems. [0003] Since different user terminals in a cell of the LTE system use ...

Claims

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Application Information

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IPC IPC(8): H04W52/24H04L1/16H04W28/04H04W52/48H04L1/18
CPCH04W52/362H04W52/48H04W52/248H04W52/225H04L1/1822H04W52/221H04W52/20
Inventor 王琳张鹏王立平
Owner ZTE CORP
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