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Method and apparatus for search space sharing

A search space and common search space technology, applied in the field of search space sharing of downlink control information, can solve problems such as preventing search space sharing and conflict, and achieve the effects of reducing the number of blind detections, reducing the blocking rate, and reducing control channel resources.

Active Publication Date: 2011-12-21
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

However, search space sharing is only applicable to component carriers with the same bandwidth, because different bandwidths of component carriers lead to different lengths of downlink control information
This prevents the use of search space sharing
[0008] 2. PDCCH (Physical Downlink Control Channel) conflict

Method used

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  • Method and apparatus for search space sharing
  • Method and apparatus for search space sharing
  • Method and apparatus for search space sharing

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Embodiment Construction

[0035] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] figure 1 A schematic diagram of an application scenario of the wireless communication network 100 according to a specific embodiment of the present invention is shown. Those of ordinary skill in the art should understand that, for the sake of brevity, figure 1The wireless communication network 100 in the figure only shows the base station 110 and the user terminal 120, the actual wireless communication network includes a plurality of base stations, and each base station manages a plurality of user terminals.

[0037] figure 2 A flow chart of a method for sharing search spaces during cross-carrier scheduling in a base station of a wireless communication network according to a specific embodiment of the present invention is shown. The following combination figure 2 right figure 1 The process of sharing the search space when the use...

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Abstract

The present invention proposes a technical solution for realizing search space sharing. For a downlink control information format, a uniform length irrelevant to component carrier bandwidth is adopted, thereby making it possible to share space. The base station determines whether the initial length of the downlink control information is less than the maximum length corresponding to the format of the downlink control information; if the initial length of the downlink control information is less than the maximum length corresponding to the format of the downlink control information, then the downlink control information Bits are added to the information so that the actual length of the downlink control information is equal to the maximum length. Correspondingly, when receiving the downlink control information, the user terminal deletes the added bits from the received downlink control information according to the positions of the bits added by the base station, so as to obtain the downlink control information of the original length.

Description

technical field [0001] The invention relates to the search space sharing of downlink control information in LTE-Advanced wireless communication network. Background technique [0002] In LTE, there is only one component carrier, and for each user terminal, there is only one corresponding downlink control information (DCI). The user terminal uses RNTI to perform blind detection of DCI information on the PDCCH. [0003] In LTE-Advanced, carrier aggregation is adopted to increase system capacity, that is, in LTE-Advanced, multiple component carriers may exist, and the system bandwidth may reach 100M. A user terminal may be configured with multiple component carriers. [0004] The 3GPP RAN1 #61 meeting passed the scheme of sharing DCI search space for cross-carrier scheduling. Cross-carrier scheduling DCI search space sharing means that the user terminal searches for DCI information of multiple carriers in the same search space. Cross-carrier DCI search space sharing requires t...

Claims

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Application Information

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IPC IPC(8): H04W72/14
Inventor 张晓博刘瑾尤明礼
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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