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Method for sending hybrid automatic repeat request-acknowledgement character (HARQ-ACK) feedback information

A technology of feedback information and number of bits, applied in signaling allocation, transmission path sub-channel allocation, error prevention/detection using return channel, etc., can solve problems such as adjacent frequency interference, and achieve the effect of avoiding waste

Active Publication Date: 2013-01-30
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0032] In fact, when the frequency domain distance between multiple CCs performing carrier aggregation is large enough, these CCs can adopt different uplink and downlink configurations without interfering with each other; in addition, in some cases, the phase frequency of each CC may Different uplink and downlink configurations have been deployed (for example, adjacent frequencies are different TD-SCDMA configurations). At this time, if the same uplink and downlink configurations are used for these CCs, serious adjacent frequency interference will occur. Therefore, in LTE In the follow-up research of -A, an important topic is to study how to effectively support the case where the uplink and downlink configurations of multiple CCs of carrier aggregation are different

Method used

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  • Method for sending hybrid automatic repeat request-acknowledgement character (HARQ-ACK) feedback information
  • Method for sending hybrid automatic repeat request-acknowledgement character (HARQ-ACK) feedback information
  • Method for sending hybrid automatic repeat request-acknowledgement character (HARQ-ACK) feedback information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Assume that the base station configures two CCs for the CA UE, namely the primary CC and the secondary CC. The primary CC is TDD uplink and downlink configuration 2, MIMO transmission mode, and the secondary CC is TDD uplink and downlink configuration 1, SIMO transmission mode, such as Figure 4 shown. The bundling window of the primary CC includes subframes {4,5,6,8}, the bundling window size is 4, the bundling window of the secondary CC includes subframes {4,5,6}, the bundling window size is 3, and the UL of PUSCH is scheduled Grant is sent on subframe 6 of the secondary CC, assuming UL DAI=2.

[0065] If the secondary CC is in SIMO transmission mode, then the number of HARQ-ACK feedback information bits of the secondary CC M_i=(min{M_b, UL DAI}+M_a)=min{3,2}+0=2;

[0066] The primary CC is in MIMO transmission mode, and the number of HARQ-ACK feedback information bits M i of the primary CC=2*(min{M_b, UL DAI}+M_a)=2*(min{3,2}+1)=6.

[0067] The UE is configured wit...

Embodiment 2

[0077] Assume that the base station configures 3 CCs for the CA UE, namely primary CC, secondary CC1 and secondary CC2, the primary CC is TDD uplink and downlink configuration 2, MIMO transmission mode, secondary CC1 is TDD uplink and downlink configuration 2, MIMO transmission mode, secondary CC2 It is TDD uplink and downlink configuration 1, MIMO transmission mode, such as Figure 7 shown. The bundling window of the main CC includes subframes {4,5,6,8}, the bundling window size is 4, the bundling window of the auxiliary CC1 includes subframes {4,5,6,8}, and the bundling window size is 4, the auxiliary CC2 The bundling window includes subframes {4,5,6}, the bundling window size is 3, and the UL Grant for scheduling PUSCH is sent on subframe 6 of secondary CC2, assuming UL DAI=3.

[0078] Secondary CC2 is in MIMO transmission mode, then the number of HARQ-ACK feedback information bits of secondary CC2 M_i=2*(min{M_b, UL DAI}+M_a)2*(min{3,3}+0)=6;

[0079] The primary CC is i...

Embodiment 3

[0092] Assume that the base station configures two CCs for the CA UE, namely the primary CC and the secondary CC. The primary CC is TDD uplink and downlink configuration 2, MIMO transmission mode, and the secondary CC is TDD uplink and downlink configuration 1, SIMO transmission mode, such as Figure 4 shown. The bundling window of the primary CC includes subframes {4,5,6,8}, the bundling window size is 4, the bundling window of the secondary CC includes subframes {4,5,6}, the bundling window size is 3, and the UL of PUSCH is scheduled Grant is sent on subframe 6 of the secondary CC, assuming UL DAI=2.

[0093] If the secondary CC is in SIMO transmission mode, the number of HARQ-ACK feedback information bits M i=min{UL DAI,M_b}+M_a=2 of the secondary CC, and the 2-bit HARQ-ACK information bits are directly transmitted;

[0094] The primary CC is in MIMO transmission mode, and the number of bits of the HARQ-ACK feedback information of the primary CC is equal to the value of UL...

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Abstract

The invention provides a method for sending hybrid automatic repeat request-acknowledgement character (HARQ-ACK) feedback information. The method is used for situations of different time division duplex (TDD) uplink and downlink configuration of a plurality of component carriers (CCs) in carrier aggregation (CA). The method comprises receiving uplink grant (UL grant) sent by a base station through unified equipment (UE) and obtaining a downlink link distribution indexes (UL DAI) from the UL grant; and using the UE to send the HARQ-ACK feedback information in a physical uplink shared channel (PUSCH), and enabling a bit number of the HARQ-ACK feedback information to be determined according to a UL DAI value in the UL grant in the PUSCH for scheduling and transmitting the HARQ-ACK feedback information and bundling window size (bundling window size). The method can conduct correct HARQ-ACK feedback information transmission in a CA system with different TDD uplink and downlink configurations in a plurality of CCs, and further the situations of different TDD uplink and downlink configuration in the plurality of CCs of the CA can be effectively supported.

Description

technical field [0001] The invention relates to wireless communication system technology, in particular to a method for sending HARQ-ACK feedback information. Background technique [0002] The Long Term Evolution (LTE) system supports two duplex modes of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). figure 1 It is the frame structure of the TDD system. The length of each radio frame is 10ms, which is equally divided into two half-frames with a length of 5ms. Each half-frame contains 8 time slots with a length of 0.5ms and 3 special domains, namely downlink pilot time slot (DwPTS), guard interval (GP) and uplink pilot time slot (UpPTS), these 3 special domains The sum of the lengths is 1ms. Each subframe consists of two consecutive time slots, that is, the kth subframe includes time slot 2k and time slot 2k+1. The TDD system supports seven different TDD uplink and downlink configurations, as shown in Table 1. In Table 1, D represents a downlink subframe...

Claims

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Application Information

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IPC IPC(8): H04L1/18
CPCH04L1/1614H04L1/1854H04L5/0055H04L5/1469
Inventor 付景兴李迎阳
Owner BEIJING SAMSUNG TELECOM R&D CENT
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