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Method and device for transmitting and receiving downlink control channel in wireless communication system

A wireless communication system and control channel technology, applied in the field of sending and receiving confirmation/non-confirmation of hybrid automatic repeat request, which can solve the problem of large signaling overhead and other issues

Active Publication Date: 2022-06-03
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Explicit signaling of information about ACK / NACK resources from Node B to UE for each TTI causes significant signaling overhead

Method used

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  • Method and device for transmitting and receiving downlink control channel in wireless communication system
  • Method and device for transmitting and receiving downlink control channel in wireless communication system
  • Method and device for transmitting and receiving downlink control channel in wireless communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] figure 2 The ACK / NACK resource allocation scheme according to the present invention is explained.

[0045] refer to figure 2 , Node B scheduler 200 selects non-persistent scheduling 211 or persistent scheduling 212 for the data channel.

[0046] In non-persistent scheduling 211, M SCCHs 203 convey scheduling information on M data channels. Each SCCH is a physical layer control channel that carries scheduling information about one data channel. The ACK / NACK resource for sending ACK / NACK for the data channel is implicitly indicated by the index of the SCCH 203 mapped to the data channel. Thus, different data channels, ie different SCCHs 203 are mapped one-to-one to ACKCHs 207 within a fixed size resource group 209 , as indicated by reference numeral 205 .

[0047] The simplest mapping rule is that SCCH#n is mapped to ACKCH#n, of course other mapping rules are also available. The mapping between SCCH 203 and ACKCH 207 eliminates the need for the Node B to explicitly...

Embodiment 2

[0089] Figure 10 An ACK / NACK resource allocation scheme for a MIMO system according to another embodiment of the present invention is described.

[0090] MIMO schemes are classified into single codeword MIMO (SCW-MIMO) and multi-codeword MIMO (MCW-MIMO). In MCW-MIMO where the transmitter transmits multiple codewords simultaneously, decoding is performed for each codeword. Therefore, as many ACKCHs are required as codewords transmitted. like Figure 10 As shown, therefore, the ACKCH of at least one codeword (such as the first codeword) on the non-persistently scheduled MCW-MIMO data channel uses the ACK / NACK resource mapped to the index of the SCCH for the first codeword, As indicated by reference numeral 1000 , while the ACK / NACK resources for the remaining codewords are explicitly signaled together with SCCH 1002 for non-persistently scheduled MCW-MIMO data channels, as indicated by reference numeral 1003 . The ACK / NACK resource shares a variable-sized resource group 100...

Embodiment 3

[0094] Figure 11 The ACK / NACK resource allocation scheme according to the third embodiment of the present invention is explained. ACK / NACK resources are allocated in consideration of cell coverage of ACKCH. Here, consider the 3GPP EUTRA standard, where a TTI of 1 ms is defined.

[0095] The cell coverage of ACKCH is defined as a cell radius in which ACKCH can be stably detected. In order to extend cell coverage for limited maximum transmit power, it is necessary to increase the received energy of ACKCH at the receiver by increasing the transmission duration of ACKCH. However, as the transmission duration of the ACKCH increases, the amount of resources occupied by the ACKCH also increases proportionally.

[0096] Therefore, for efficient use of radio resources, the variable-sized resource group 1101 for persistently scheduled data channels is divided into a first resource group 1107 with a transmission duration of 1 ms and a second resource group 1107 with a transmission du...

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Abstract

Provided are a method and apparatus for allocating and signaling ACK / NACK resources in a wireless communication system, wherein a Node B determines to use ACK / NACK resources within a first resource group of a predetermined fixed size for non-persistently scheduled data ACK / NACK transmission of the channel, ACK / NACK resources are implicitly mapped to the scheduling control channel SCCH carrying scheduling information about non-persistently scheduled data channels; and ACK / NACK within a predetermined variable-sized second resource group is allocated The resource is used for ACK / NACK transmission of the persistently scheduled data channel, and resource indication information that explicitly indicates the allocated ACK / NACK resource is sent to at least one UE.

Description

[0001] This case is a divisional application of an invention patent application with an application date of January 10, 2008, an application number of 201310316472.3, and an invention title of "Method and device for allocating and sending confirmation / unconfirmation resources in a wireless communication system". technical field [0002] The present invention generally relates to wireless communication systems. More particularly, the present invention relates to a method and apparatus for transmitting and receiving acknowledgment / non-acknowledgement (ACK / NACK) for hybrid automatic repeat request (HARQ). Background technique [0003] There are two main error control schemes in data transmission systems, forward error correction (FEC) and automatic repeat request (ARQ). FEC systems attempt to correct errors in received data. If the error correction is successful, the correct data is decoded. If the error correction fails, erroneous data is provided to the user or the data is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04L1/18H04L5/00H04W72/04
CPCH04L1/1671H04L1/1861H04L1/1896H04L5/0057H04L5/0055H04L1/1887H04L1/1607H04L1/1867H04L5/0007H04L5/0053H04L5/006H04L5/0064H04L5/0091H04W72/04H04W72/23
Inventor 赵俊暎李周镐郭龙准
Owner SAMSUNG ELECTRONICS CO LTD
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