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Method for feeding back ACK/NACK (acknowledgement character/negative acknowledgement) information

A technology of feedback information and feedback status, which is applied in the direction of using the return channel for error prevention/detection, digital transmission systems, electrical components, etc., to achieve the effect of improving the throughput of downlink data

Inactive Publication Date: 2012-07-25
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the method described above only provides a solution when M is equal to 3 and M is equal to 4, but for TDD uplink and downlink configuration 5, a mapping method is needed to feed back the ACK / NACK information of two cells

Method used

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  • Method for feeding back ACK/NACK (acknowledgement character/negative acknowledgement) information
  • Method for feeding back ACK/NACK (acknowledgement character/negative acknowledgement) information
  • Method for feeding back ACK/NACK (acknowledgement character/negative acknowledgement) information

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Embodiment 1

[0056] The uplink and downlink configuration of TDD is 5, because the ACK / NACK information of at most 9 downlink subframes needs to be fed back in one uplink subframe, that is, the size of the bundling window is 9. In this case, the following method can be used to generate 2-bit feedback information for each cell respectively. as shown in Table 3,

[0057] The number of consecutive ACKs in the feedback information represented by 2 bits (A, A) may be 3, 6 or 9. Among them, the specific feedback information with the number of consecutive ACKs equal to 3 is that the first 3 ACK / NACK information is ACK, and the other 6 ACK / NACK information are DTX, that is, "A, A, A, D, D, D, D, D , D"; the specific feedback information that the number of consecutive ACKs is equal to 6 is that the first 6 ACK / NACK messages are ACK, and the other 3 ACK / NACK messages are DTX, that is, "A, A, A, A, A, A, D , D, D"; the specific feedback information that the number of consecutive ACKs is equal to 9 ...

Embodiment 2

[0065] The uplink and downlink configuration of TDD is 5, because the ACK / NACK information of at most 9 downlink subframes needs to be fed back in one uplink subframe, that is, the size of the bundling window is 9. It is assumed that due to some other restrictions, the base station can only send PDCCH or SPS service data that needs to feed back ACK / NACK on a part of the subframes. For example, the base station configures the maximum number of PDCCH or SPS service data that the UE needs to feed back ACK / NACK within the binding window through high-level signaling; or, according to some other system parameters, it can be inferred that the UE needs to feed back within the binding window. The maximum number of ACK / NACK PDCCH or SPS service data. Alternatively, by adopting other methods, the UE may know the maximum number of PDCCH or SPS service data within the bundling window for which ACK / NACK needs to be fed back. Then, the generation methods of the four feedback states can be a...

Embodiment 3

[0102] The uplink and downlink configuration of TDD is 5, because the ACK / NACK information of at most 9 downlink subframes needs to be fed back in one uplink subframe, that is, the size of the bundling window is 9. At this time, the following method can be used to generate 5 mapping states for each cell. As shown in Table 5,

[0103] The number of consecutive ACKs in the feedback information represented by the mapping state (A, A) may be 3, 6 or 9. Among them, the specific feedback information with the number of consecutive ACKs equal to 3 is that the first 3 ACK / NACK information is ACK, and the other 6 ACK / NACK information are DTX, that is, "A, A, A, D, D, D, D, D , D"; the specific feedback information that the number of consecutive ACKs is equal to 6 is that the first 6 ACK / NACK messages are ACK, and the other 3 ACK / NACK messages are DTX, that is, "A, A, A, A, A, A, D , D, D"; the specific feedback information that the number of consecutive ACKs is equal to 9 means that a...

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Abstract

The invention provides a method for feeding back ACK / NACK (acknowledgement character / negative acknowledgement) information, comprising the following steps of: receiving physical downlink control channel (PDCCH) information and downlink data which are transmitted by a receiving base station by user equipment (UE) under a time division duplex (TDD) uplink / downlink configuration 5 mode, and generating corresponding ACK / NACK feedback information; confirming a feedback state from 4 feedback states according to the number of the continuous ACK starting from a first data subframe in a current bound window in the ACK / NACK feedback information, and expressing the confirmed feedback state by 2 bits of state information; and feeding back the state information by the UE based on an information channel selecting method. After the method disclosed by the invention is adopted, the method for transmitting the ACK / NACK information of two cells is provided under the TDD uplink / downlink configuration 5 based on the information selection, so that the throughput of the downlink data can be preferably improved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and in particular, to a method for feeding back ACK / NACK information. Background technique [0002] The Long Term Evolution (LTE) system performs data transmission based on Hybrid Automatic Repeat Request (HARQ), that is, according to the reception status of the data, the data receiver will send an acknowledgement (ACK) or negative acknowledgement (NACK) reception status feedback information accordingly. The scheduling information of dynamic downlink data transmission is transmitted through the physical downlink control channel (PDCCH), while for semi-persistent scheduling (SPS) services, the initial transmission scheduling information of the downlink data does not need to send the PDCCH, only when the downlink data is retransmitted. PDCCH transmits scheduling information. [0003] For the LTE TDD system, in order to enable the user equipment (UE) to determine whether it h...

Claims

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Application Information

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IPC IPC(8): H04L1/18
CPCH04L1/18H04L1/1692H04L1/1614
Inventor 李迎阳孙程君李小强
Owner BEIJING SAMSUNG TELECOM R&D CENT