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A method of sending harq-ack feedback information

A technology for feedback information and channels, applied in signaling allocation, transmission path sub-channel allocation, digital transmission system, etc., and can solve problems such as adjacent frequency interference

Active Publication Date: 2018-12-25
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 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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  • A method of sending harq-ack feedback information
  • A method of sending harq-ack feedback information
  • A method of sending harq-ack feedback information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] Assuming that the base station configures 2 CCs for the CA UE, the primary CC and the secondary CC, the primary CC uses TDD uplink / downlink configuration 2, and the secondary CC uses TDD uplink / downlink configuration 5. In this combination, the HARQ- The ACK timing relationship refers to the HARQ-ACK timing relationship under their respective TDD uplink and downlink configurations. The bundling window of the main CC includes subframes {4,5,6,8}, the size of the bundling window is 4, and the bundling window of the secondary CC includes subframes {9,0,1,3,4,5,6,7, 8}, the size of the bundling window is 9, the UL Grant for scheduling PUSCH is sent on subframe 8 of the secondary CC, assuming W DAI UL = 3. This case belongs to Case 2 in Method 1.

[0130] The primary CC is TDD uplink and downlink configuration 2, then the B of this CC c DL Equal to min(W DAI UL , M c }=min{3,4}=3, assuming that the main CC is the SIMO transmission mode, then the number of bits of the HARQ-A...

Embodiment 2

[0147] Assuming that the base station configures 2 CCs for the CA UE, the primary CC and the secondary CC, the primary CC uses TDD uplink / downlink configuration 2, and the secondary CC uses TDD uplink / downlink configuration 5. In this combination, the HARQ- The ACK timing relationship refers to the HARQ-ACK timing relationship under their respective TDD uplink and downlink configurations. The bundling window of the main CC includes subframes {4,5,6,8}, the size of the bundling window is 4, and the bundling window of the secondary CC includes subframes {9,0,1,3,4,5,6,7, 8}, the size of the bundling window is 9, the UL Grant for scheduling PUSCH is sent on subframe 8 of the secondary CC, assuming W DAI UL =1. This case belongs to Case 2 in Method 2, assuming that formula (1) is used for calculation.

[0148] The primary CC is TDD uplink and downlink configuration 2, then the B of this CC c DL Equal to min{(W DAI UL +4*ceiling((U-W DAI UL ) / 4)),M c }. Assuming that the sum of ...

Embodiment 3

[0158] Assuming that the base station configures 2 CCs for the CA UE, the primary CC and the secondary CC, the primary CC uses TDD uplink / downlink configuration 2, and the secondary CC uses TDD uplink / downlink configuration 5. In this combination, the HARQ- The ACK timing relationship refers to the HARQ-ACK timing relationship under their respective TDD uplink and downlink configurations. The bundling window of the main CC includes subframes {4,5,6,8}, the size of the bundling window is 4, and the bundling window of the secondary CC includes subframes {9,0,1,3,4,5,6,7, 8}, the size of the bundling window is 9, the UL Grant for scheduling PUSCH is sent on subframe 8 of the secondary CC, assuming W DAI UL =1. This case belongs to Case 2 in Method 2.

[0159] The primary CC is TDD uplink and downlink configuration 2, then the B of this CC c DL Equal to M c =4, assuming that the main CC is in the SIMO transmission mode, then the number of bits of the HARQ-ACK feedback information ...

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Abstract

This application provides a method for sending HARQ-ACK feedback information, which is used in the case where the TDD uplink and downlink configurations of multiple component carriers (CCs) in the carrier aggregation (CA) configured by the UE are different. The method includes: the UE receives the information sent by the base station PDCCH and PDSCH; the UE indicates the downlink according to the received PDCCH, the downlink allocation index (ULDAI) obtained from the uplink grant (UL Grant) of the PDCCH, the number of PDSCH subframes received in the HARQ-ACK bundling window The combination of the sum of the number of PDCCHs released by Semi-Persistent Scheduling (SPS) and the size of the HARQ-ACK bundling window, determines that each CC sends HARQ in the physical uplink shared channel (PUSCH) of the current uplink subframe. - The number of downlink subframes of the ACK feedback information; the UE sends the HARQ-ACK feedback information of each CC on the PUSCH of the current uplink subframe, and the number of bits of the HARQ-ACK feedback information of each CC is determined according to the number of downlink subframes. Applying this application can not only perform correct HARQ-ACK feedback information transmission in a CA system with different uplink and downlink configurations of multiple CCs, but also avoid the waste of PUSCH resources, and can effectively support the uplink and downlink configuration of multiple CCs with carrier aggregation different situations.

Description

Technical field [0001] This application relates to wireless communication system technology, and in particular to a method for sending HARQ-ACK feedback information. Background technique [0002] The Long Term Evolution (LTE) system supports two duplex modes: 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, and it 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 is composed of two consecutive time slots, that is, the kth subframe includes time slot 2k and time slot 2k+1. The TDD system supports 7 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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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18
CPCH04L1/1607H04L1/1812H04L1/1854H04L1/1861H04L5/0055H04L1/187H04L1/1893
Inventor 付景兴李迎阳孙程君
Owner BEIJING SAMSUNG TELECOM R&D CENT
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