Method and device for multicast in wireless communication
A technology of wireless communication and equipment, applied in the field of multicast in wireless communication, can solve problems such as complex implementation, and achieve the effects of good quality degradation, good scalability and flexibility
Active Publication Date: 2016-03-30
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Finally, the user equipment needs to distinguish 8 bits, that is, 256 power levels, and this is too complex to implement for the current user equipment that only needs to distinguish between two or four power levels
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[0033] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0034] figure 2 It is a simplified flowchart schematically showing a method 200 for multicast in wireless communication according to the present invention. As shown in the figure, the method 200 starts at step S201. In step S202, the method 200 respectively extracts bits with the same importance level in each video block in the video frame, so as to form multiple data streams with different importance levels. Next, the method 200 proceeds to step S203. In step S203, the multiple data streams are respectively coded in a loop with multiple different coding rates. Then the method 200 proceeds to step S204, in which the encoded multiple data streams are divided into multiple groups according to the importance level and different powers are allocated to each group. The method 200 then proceeds to step S205. In this step S205, multiple data streams are m...
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The invention provides a multicasting method and device for wireless communication; the multicasting method comprises the following steps of: respectively extracting bits with the same importance grade from video blocks in a video frame so as to form a plurality of data streams with different importance grades; sequentially and circularly coding the plurality of data streams by using multiple different coding rates; dividing the plurality of coded data streams into a plurality of groups according to the importance grade, and distributing different powers to the groups; and carrying multicasting on the plurality of data streams according to the distributed powers. According to the method and device of the invention, the smooth quality degradation of receiving signals can be realized, and very good frequency spectrum efficiency can be obtained. In addition, as the grouping size, the coding rate, the power distribution grade in the multicasting method and device are configurable, good elasticity and flexibility are supplied, and the multicasting method and device are suitable for different requirements of operators.
Description
Technical field [0001] The present invention relates generally to wireless communication, and more specifically, to a method and apparatus for multicast in wireless communication. Background technique [0002] In wireless communication, signal quality and channel capacity are specific to user equipment, and they vary with the location of the user equipment, radio propagation conditions, and so on. For multicast systems such as 3GPPLTE (3rd Generation Partnership Project Long Term Evolution), the video stream is usually configured with a predetermined coding and modulation scheme, and the SNR (signal to noise ratio) or PSNR (signal to noise ratio) required to receive the video stream is usually configured. The pixel signal-to-noise ratio) is also the same. The ideal multicast system is to enable the user equipment to receive the multicast data stream from the base station with its maximum channel capacity. However, for the current multicast system, since there is no feedback fro...
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IPC IPC(8): H04W4/06H04W28/16H04N21/6405
CPCY02D30/70
Inventor 陈宇杜鸿飞胡中骥
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD