Feedback information transmission method and system, UE and base station

A technology of feedback information and transmission method, which is applied in user terminals, feedback information transmission methods, base stations and system fields, and can solve the problem that feedback information cannot be suitable for short TTI

Active Publication Date: 2017-11-21
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a feedback information transmission method, UE, base station and system, which solves the problem that the transmission of feedback information cannot be suitable for short TTI or variable-length TTI

Method used

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  • Feedback information transmission method and system, UE and base station
  • Feedback information transmission method and system, UE and base station
  • Feedback information transmission method and system, UE and base station

Examples

Experimental program
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Effect test

example 1

[0265] Such as Figure 4 As shown, for a Frequency Division Duplex (FDD, Frequency Division Duplexing) carrier, the base station transmits downlink TTIs with a TTI length of 2 OFDM symbols in subframe n-1, and the feedback information corresponding to these downlink TTIs is performed in subframe n feedback.

[0266] The UE can generate feedback bits according to the TTI number. Assuming that under the transmission condition of single carrier and single codeword, the UE correctly receives all TTIs, the feedback codebook is 7 bits 1. Subframe n includes multiple transmission resources of feedback information, the base station can pre-configure multiple resources for the terminal through RRC signaling, and notify the transmission resource corresponding to the current transmission through downlink scheduling signaling when scheduling downlink transmission. In this example, the transmission resource of the feedback information occupies 2 OFDM symbol lengths.

example 2

[0267] Example 2: If Figure 5 As shown, each subframe may be a special subframe for a Time Division Duplex (TDD, Time Division Duplexing) carrier or a new 5G carrier.

[0268] Assuming that the base station configures carrier 1 and carrier 2 for the UE, the downlink TTI in the subframe on carrier 1 occupies 10 OFDM symbols, the GP occupies 1 OFDM symbol, the uplink TTI occupies 3 OFDM symbols, and the downlink TTI in the subframe on carrier 2 occupies 10 OFDM symbols. TTI occupies 9 OFDM symbols, GP occupies 3 OFDM symbols, and uplink TTI occupies 2 OFDM symbols. The base station schedules downlink transmission on carrier 1 and carrier 2 at the same time in subframe n-1, and transmits downlink TTIs with a TTI length of 1 OFDM symbol. Feedback information corresponding to these downlink TTIs is fed back in subframe n.

[0269] Method 1: The UE can generate feedback bits according to the maximum number of downlink TTIs on each carrier. Assume that under the condition of single...

example 3

[0271] Example 3: If Figure 6 As shown, for the TDD carrier or the new 5G carrier, each subframe can be a special subframe.

[0272] Assuming that the base station configures carrier 1 and carrier 2 for the UE, the downlink TTI in the subframe on carrier 1 occupies 10 OFDM symbols, the GP occupies 1 OFDM symbol, and the uplink TTI occupies 3 OFDM symbols. Downlink TTI occupies 10 OFDM symbols, GP occupies 2 OFDM symbols, and uplink TTI occupies 2 OFDM symbols. The base station schedules downlink transmission on carrier 1 and carrier 2 at the same time in subframe n-1, and transmits downlink TTIs with variable length TTIs. Feedback information corresponding to these downlink TTIs is fed back in subframe n.

[0273]The UE can determine the number of feedback bits according to the downlink basic TTI length (2 OFDM symbols). Assuming that under the condition of single codeword transmission, the base station schedules 4 downlink TTIs in carrier 1 subframe n-1, occupying 3, 2, 2 ...

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Abstract

The invention provides a feedback information transmission method and system, UE and a base station. The feedback information transmission method can comprise the steps that the UE generates feedback information of a target subframe; and the UE transmits the feedback information in a subframe next to the target subframe. Transmission of the feedback information in the embodiment of the invention can be applicable to short TTIs (Transmission Time Intervals) or variable-length TTIs.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular to a feedback information transmission method, a user terminal (UE, User Equipment), a base station and a system. Background technique [0002] With the development and change of mobile communication service requirements, many communication organizations have defined higher user plane delay performance requirements for future mobile communication systems. Among them, the main method to shorten the delay performance of the user plane is to reduce the length of Transmission Time Interval (TTI, Transmission Time Interval), that is, short TTI or TTI with variable length will appear in the future. For example: one subframe can contain multiple TTIs. However, current feedback information transmission solutions are all based on the existing fixed-length TTI for feedback, for example: the feedback information of subframe n is fed back in subframe n+4. For short TTIs o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04L1/18H04L5/00H04W72/04H04W72/12
CPCH04L1/1607H04L1/1812H04L1/1861H04L5/0055H04W72/0446H04W72/1273H04W72/04
Inventor 司倩倩潘学明高雪娟郑方政
Owner DATANG MOBILE COMM EQUIP CO LTD
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