Method and device for sending data to multiple terminals

A terminal transmission and terminal technology, which is applied in the field of communication, can solve the problems of terminal side packet loss, data packet loss, high terminal side packet loss rate, etc., and achieve the effect of improving mutual interference

Active Publication Date: 2012-12-12
ZTE CORP
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Problems solved by technology

[0004] It can be seen from the above description that after the terminal receives a data packet containing data of multiple users, once the wrong packet is sorted out, all remaining packets will be discarded. If the packet of the current terminal is in the data packet If the location is relatively late, it is likely to discard the data packet sent to itself due to the previous data packet error, which will cause packet loss on the terminal side
In the related art, the data packing method adopted by the base station will cause the problem of high packet loss rate on the terminal side. Therefore, how to reduce the probability of packet loss on the terminal side so as to optimize the performance of the air interface in the WIMAX wireless packet network is a problem that needs to be solved at present. question

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  • Method and device for sending data to multiple terminals
  • Method and device for sending data to multiple terminals
  • Method and device for sending data to multiple terminals

Examples

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Embodiment 1

[0043] This embodiment uses an example to describe in detail how the method for sending data to multiple terminals provided in the above embodiments reduces the probability of user data packet loss in practical applications, thereby improving the problem of mutual interference among downlink users.

[0044] Figure 5 is a schematic diagram of the MAC PDU format defined by WIMAX according to Embodiment 1, such as figure 1 As shown, each media access control (Media Access Control, referred to as MAC) PDU includes a PDU header, which contains the main control information of the PDU, such as the CID of the target terminal (indicating the receiver of the PDU), the length of the PDU (length, indicating the length of the PDU), header check (HCS), etc. The data packet can be separated according to the length of the PDU, and the target terminal of the PDU can be found according to the CID. According to the header check field, it can be judged whether the received data is wrong. The ...

Embodiment 2

[0053] This embodiment describes in detail the process of putting the PDUs of each terminal in the ascending order of signals when forming a BURST. This process can be realized by partially modifying the system code on the base station side, without modifying the processing process of the terminal. There are few changes to the existing system, and the implementation is relatively simple. The whole processing is completed in two processes, one is periodic downlink signal acquisition; the other is the processing flow of BURST, which is divided into three steps of query, sorting, and PDU in order to complete, which are described below:

[0054] 1. Downlink signal acquisition:

[0055] The downlink signal of each terminal is collected periodically (other triggering methods can also be used), and the signal of each terminal is converted to the corresponding CID to obtain a corresponding relationship table between CID and downlink CINR as follows.

[0056] Table 1

[0057] ...

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Abstract

The invention provides a method and a device for sending data to multiple terminals. The method includes that a base station determines signal quality of each terminal in the multiple terminals and packages data to be sent to each terminal in the multiple terminals into a same burst for sending according to a sequence of the signal quality from low to high. The method and the device for sending the data to the multiple terminals solve the problem of high probability of packet loss on terminal sides caused by current data packaging and sending processes, improve probability that the terminals with poor channel quality can receive own data, improve the situation of data packet loss of users caused by the fact that data sent to the other terminal are incorrect and solve the problem of mutual interference among downlink users.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and device for sending data to multiple terminals. Background technique [0002] In a Worldwide Interoperability for Microwave Access (Wimax for short) wireless packet network, a base station sends data to a terminal in a broadcast manner. [0003] In order to improve resource utilization, the base station usually packs the data protocol data units (Protocol Data Unit, PDU for short) of multiple end users together, and sends them in a burst (BURST), and the terminal itself extracts data from the packed information Sorting out the data sent to itself. For example, the base station packs the data of four end users A, B, C, and D into one BURST and sends them. The data packets pack the data of each end user together in the order of A, B, C, and D. During the sorting process, in order to find the data packets sent to itself, the terminal needs to search the entire package...

Claims

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Application Information

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IPC IPC(8): H04W72/12
Inventor 李志安
Owner ZTE CORP
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