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Method for processing cross-carrier indication and user equipment

A user equipment, cross-carrier frequency technology, applied in the direction of network traffic/resource management, communication between multiple stations, access restrictions, etc., can solve the large control information overhead, decoding impact, threatening the correct reception of transmission blocks, etc. problem, to achieve the effect of solving the HARQ cache invalidation of hybrid automatic retransmission and ensuring normal and efficient

Inactive Publication Date: 2011-04-27
夏普高科技研发(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some literature (ControlSignaling Design for Supporting Carrier Aggregation, R1-090792, 3GPPRAN1 #56, Motorola, February 2009) pointed out that information indicating the start position of the transmission block can be added to the resource allocation information of each carrier frequency; there is another simple method (Views on PDCCH Carrier Indicator, R1-093225, 3GPP RAN1 #58, NEC Group, August 2009) means that the user equipment for cross-carrier frequency scheduling sets its control information symbols on the carrier frequency carrying PDSCH to a fixed number of 3, This method will cause a large control information overhead in the case of a large number of cross-carrier frequency scheduling user equipment or a large number of allocated resource blocks, and is not an efficient solution; there is another method (PDSCH-to- RE mapping robust against CCFI reception errors, R1-081228, 3GPP RAN1 #52bis, Samsung, March 2008) is to modify the mapping from PDSCH to RE (Resource Element), so that the modulation symbols on PDSCH are first in area 1 (that is, the 4th The first OFDM (Orthogonal Frequency Division Multiplexing) symbol to the 14th OFDM symbol) is mapped in the order of increasing time, and then mapped in the order of decreasing time in area 2 (ie, the third OFDM symbol to the first OFDM symbol)
This method can ensure the correct starting position of PDSCH, but when a PCFICH detection error occurs, the decoding of the code block (code block) at the end of PDSCH will be seriously affected, directly threatening the integrity of the entire transport block (transport block). received correctly
[0013] This patent application proposes a flexible, simple and efficient solution to the problem of HARQ buffer failure caused by PCFICH detection errors

Method used

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  • Method for processing cross-carrier indication and user equipment
  • Method for processing cross-carrier indication and user equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1a

[0051] Such as Figure 5 As shown, several resource elements RE (Resource Element) or several control channel elements CCE (Control Channel Element) are reserved in the control information area on the carrier frequency carrying the PDSCH. The positions of these reserved resources are associated with the number of control information symbols indicated by the PCFICH, and the content may be a sequence of a certain length, which is agreed in advance between the base station and the user equipment. The coding and modulation scheme may be the same as the coding and modulation scheme of the CCE where it is located. Therefore, the detection result of the PCFICH on the carrier frequency carrying the PDSCH can be further confirmed through these reserved resources, thereby improving the detection accuracy of the PCFICH.

[0052] The specific flow chart of the PDCCH cross-carrier frequency indication mechanism in the LTE-A system using this method is as follows Figure 6 Shown:

[0053...

Embodiment 1b

[0057] Same as Embodiment 1a, a number of resource elements RE or a number of control channel elements CCE are reserved at predetermined positions in the control information area on the carrier frequency carrying the PDSCH. The difference is that the predetermined locations where these resources are located can be pre-agreed between the base station and the user equipment, and the content contained in these reserved resources is according to the 3GPP specification document (TS 36.212V8.7.0, "Evolved Universal Terrestrial Radio Access ( E-UTRA); Multiplexing and channel coding") by encoding the number of control information symbols indicated by PCFICH by the method specified in section 5.3.4.1. For example, the encoding method of this content can be the same as that of PCFICH. This operation does not change the original PCFICH, and the user equipment jointly detects the contents of the PCFICH and the reserved resources when receiving it, for example, jointly decodes the contents...

Embodiment 1c

[0063] Such as Figure 8 As shown, the concept of resource reservation in this embodiment is the same as that in embodiments 1a and 1b, except that the resource reserved at this time is located at a predetermined position in the data information area of ​​the carrier frequency carrying the PDSCH. The specific position may be selected to be associated with the number of control information symbols indicated by the PCFICH, or not. For example, the position in the time domain can be selected as the fourth OFDM symbol of the current subframe, and the position in the frequency domain can be dispersed in the frequency domain subcarriers of the symbol as much as possible, for example, one resource unit can be allocated to each resource block. At this time, attention should be paid to avoiding the reference signal Port 5 originally used in multi-user MIMO (Multiple Input Multiple Output). One method is to use the method specified in Section 6.10.3.2 of the 3GPP specification document...

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Abstract

The invention discloses a method for processing a cross-carrier indication and corresponding user equipment, wherein the method comprises the following steps of: detecting a PCFICH (Physical Format Indication Channel) on a first carrier loading a PDCCH (Physical Downlink Control Channel), acquiring control information symbolic number information on the first carrier; detecting the PDCCH on the first carrier according to the control information symbolic number information on the first carrier, acquiring PDSCH (Physical Downlink Share Channel) resource block distribution information, carrier indication information and HARQ (Hybrid Automatic ReQuest) information; detecting the control information symbolic number information on a second carrier used for loading the PDSCH and indicated by the obtained the carrier indication information; and acquiring or not acquiring the PDSCH on the basis of the obtained control information symbolic number information on the second carrier and / or the PDSCH resource block distribution information. The method can find the mistake of the PCFICH on the carrier loading the PDSCH, or enhance the detection performance of the PCFICH of the carrier, or avoid the detection mistake of the PCFICH on the carrier, so that the problem of HARQ cache invalidity caused by the detection mistake of the PCFICH can be solved.

Description

technical field [0001] The present invention relates to the field of mobile communication technology, in particular to the processing of cross-carrier frequency indication in LTE-Advanced and 4G systems. According to the present invention, a method for processing cross-carrier frequency indication and corresponding user equipment are proposed. Background technique [0002] As early as in its RAN1 #53bis conference, 3GPP determined that the downlink bandwidth of the LTE-Advanced system will use spectrum aggregation (Carrier Aggregation) technology, which can support a system bandwidth greater than 20MHz. This brings more flexibility to the design of the downlink control channel, but also brings many new challenges. [0003] After discussion at the 58th meeting of 3GPP TSG RAN1, two optional downlink control channel structures for LTE-Advanced systems (Way Forward on PDCCH for Bandwidth Extension in LTE-A, R1-093699, RAN1 #58, Alcatel- Lucent et. al., August 2009). The first...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/20H04B7/26
CPCH04W48/16H04L1/0061H04L1/1812H04W72/042H04L5/001H04L5/0055H04W72/23
Inventor 杨曾刘仁茂丁铭张应余梁永明
Owner 夏普高科技研发(上海)有限公司
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