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TDD-OFDMA system physical layer descending resource allocation method

A technology of TDD-OFDMA and allocation method, which is applied in the direction of time division multiplexing usage, selection device, radio/inductive link selection arrangement, etc., can solve the problems of large number of time slots, reduction of system capacity and spectrum efficiency, bandwidth waste, etc., Reach the effect of reducing the burst frame rate, avoiding the complexity of solving, and improving the speed

Inactive Publication Date: 2008-08-20
ZTE CORP
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AI Technical Summary

Problems solved by technology

If the filling is not tight enough, there will be too many unused time slots, and the bandwidth saved by other methods will be wasted. The final result is that the system capacity and spectrum efficiency will be reduced.

Method used

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  • TDD-OFDMA system physical layer descending resource allocation method
  • TDD-OFDMA system physical layer descending resource allocation method
  • TDD-OFDMA system physical layer descending resource allocation method

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Embodiment Construction

[0047] First of all, the basic concepts used in the present invention are explained: as figure 1 As shown, the system time-frequency resource is a two-dimensional table, in which each grid represents a slot, filled with DL-MAP burst 11, UL-MAP burst 12 and data burst 13, and the unfilled part is divided into two types, including The unallocated rectangular area of ​​the slot in the lower right corner is the valid area 21, and the unfilled rectangular area except the valid area is the free area 22. The redistribution of the free area 22 may generate the free area 22, but it is impossible to generate the valid area 21. Allocation of the active area 21 may result in an active area 21, a free area 22, or both.

[0048] The second step is to illustrate the guiding ideology and method of the present invention. The time domain is from front to back, and the frequency domain is gradually advanced from top to bottom, including the following steps:

[0049] (a) After the first scheduli...

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Abstract

The invention relates to a distribution method for the downlink resource of physical layer in a TDD-OFDMA system, comprising: distributing a DL-MAP sudden(11) according to the principle of first frequency domain and then time domain, the free region below the DL-MAP sudden is distributed for an UL-MAP sudden(12) which is smaller than the DL-MAP in length; the undistributed UL-MAP sudden(12) is distributed in the effective region in a rectangular block form according to the principle of first frequency domain and then time domain, the time domain of the rectangular block is described by the right formula, the undistributed data sudden is selected in the descending order in the rectangular block form to be distributed in the effective region in turn. The method is simple to realize, avoiding the solving complexity of NP complete problem, increasing the speed of the distributing of the downlink resource of the physical layer, the method can provide an optimized preallocated bandwidth, enhance the rates of resource utilization efficiency, and reduce the explosion frame rate.

Description

technical field [0001] The present invention relates to a time division duplex-orthogonal frequency division multiple access system TIME DIVISIONDULPLEXING-Orthogonal Frequency Division Multiple Access, referred to as a TDD-OFDMA wireless communication system, in particular to a downlink burst of a TDD-OFDMA system in which rectangular time-frequency blocks exist. resource allocation method. Background technique [0002] In recent years, OFDM technology has become the mainstream of wireless communication physical layer technology due to its high spectrum efficiency and anti-multipath interference, whether it is the subsequent evolution of 3G, such as LTE, or the current popular wireless broadband access technology, such as IEEE 802.16, IEEE 802.20, both adopt OFDM as the physical layer technology to provide multiple access OFDMA. [0003] In an OFDMA system, it is divided into multiple OFDM symbols in the time domain, and multiple sub-channels in the frequency domain, and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/36H04L5/26
Inventor 张连波刘颖刘向宇
Owner ZTE CORP
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