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Downlink packet mapping method and apparatus

A mapping method and a technology of a mapping device, which are applied in the field of communication, can solve problems such as high implementation complexity, and achieve the effects of reducing hardware complexity, reducing fragmentation, and improving downlink transmission efficiency

Inactive Publication Date: 2009-07-01
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The present invention provides a downlink packet mapping method, which is used to solve the problem existing in the prior art that when mapping downlink packets to discontinuous areas in a block manner, it is necessary to increase the downlink signaling indicating the location of the area, or to implement joint optimization for packet mapping. high complexity problems

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  • Downlink packet mapping method and apparatus
  • Downlink packet mapping method and apparatus

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Embodiment Construction

[0055] The downlink packet mapping method provided by the present invention is applied to an OFDMA system, including: setting a fragment set, storing the time-frequency fragment rectangles in the physical frame that can be used to map downlink packets, and when performing time-frequency mapping on downlink packets, according to the size of the current downlink packet , calculating the degree of matching between all possible mapping modes of the packet and each fragment rectangle in the fragment set; selecting the fragment rectangle with the highest matching degree, and mapping the downlink packet according to the corresponding mapping mode; and updating the fragment set.

[0056] The method of the present invention will be described in detail below with reference to the accompanying drawings.

[0057] For the convenience of description, let the collection of fragments be U. The fragment set U may contain one or more elements, each element is a time-frequency fragment rectangle...

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Abstract

The invention relates to a descending group projection method, used in orthogonal frequency-division multiple access OFDMA system, wherein it comprises that: setting chip group, storing the time-frequency chip rectangle of physical frame used to project descending group; when the group processes time-frequency projection, based on the size of descending group, calculating match degrees of ll projection methods of said group and each chip rectangle; selecting the chip rectangle with maximum match degree; projecting said descending group via relative projection method, and refreshing the chip group. The invention also discloses a relative descending group projector. The invention can effectively reduce the chip generated in projection, to improve descending transmission efficiency, without additional signal consumption, etc.

Description

technical field [0001] The present invention relates to the communication field, in particular to a downlink packet mapping method and device in an Orthogonal Frequency Division Multiple Access (OFDMA) system. Background technique [0002] The OFDMA physical layer stipulates that downlink packets can be mapped to any time-frequency two-dimensional rectangular area composed of several consecutive slots (slots) and several consecutive subchannels (subchannels), and use the start slot in the downlink mapping frame (DL_MAP) number, the starting sub-channel number, the number of time slots and the number of sub-channels four parameters to represent the rectangular area. Such as figure 1 As shown, each rectangular block in the figure represents the mapping area of ​​a group, and the size of the group (the number of time slots × the number of sub-channels) is determined by the wireless packet scheduling module and the wireless resource management module, which is the required tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L29/06H04L27/26
Inventor 余官定张朝阳王吉滨巢志骏
Owner ZHEJIANG UNIV