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Method for distributing physical resource blocks base on OFDM system
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A technology of physical resource blocks and physical resources, which is applied in the field of physical resource block allocation in multi-carrier systems, can solve the problems of large waste, waste of spectrum resources, and data services with low delay, and achieve high utilization, saving bandwidth resources, The effect of flexible allocation of physical resources
Inactive Publication Date: 2009-02-25
ZTE CORP
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[0007] With the development of wireless communication technology, more and more services are supported, including real-time voice and streaming media services, and data services with low latency requirements; some services have relatively stable bandwidth requirements, while others have strong requirements. The different characteristics of these services put forward higher requirements for the spectrum utilization of the fourth-generation mobile communication system, especially for small services. If the PRB of the system is divided larger, it will There is a certain waste of spectrum resources; when carrying large services, there are also cases where services cannot be allocated to an integer number of PRBs. At this time, PRBs with insufficient services will also occur. If the remaining services are less than half of the services carried by one PRB When , the waste will be even greater
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Embodiment 1
[0032] refer to figure 1 As shown, it is a flow chart of the method for allocating physical resource blocks based on the OFDM system according to the first embodiment of the present invention. Described method comprises the following steps:
[0033] Step 101: the sending end (NodeB) plans different physical resource block sizes;
[0034] Specifically, the design methods of physical resource block PRBs of different sizes include:
[0035] (1) For the size of the PRB, different numbers of subcarriers can be allocated in the frequency domain;
[0036] (2) For the size of the PRB, different lengths of time can be allocated in the time domain;
[0037] (3) For the size of the PRB, the number of subcarriers and the length of time can be adjusted simultaneously in the time domain and the frequency domain.
[0038] Step 102: after the user terminal accesses the system, send a service request to the sending end, and after receiving the service request, the sending end allocates a p...
Embodiment 2
[0041] refer to figure 2 As shown in FIG. 2 , it is a flowchart of a method for allocating physical resource blocks based on an OFDM system according to the second embodiment of the present invention.
[0042] Step 201: the transmitting end plans the size of different PRBs, and determines the PRB template set according to the PRB size;
[0043] Step 202: NodeB judges whether it is necessary to reselect the template, if so, execute step 203, otherwise execute step 204;
[0044] Step 203: NodeB selects a PRB template most suitable for the current period from the PRB template set for the cell periodically or aperiodically, according to the service parameters of each user terminal in the cell at each time period, comprehensively considering the cellthroughput rate and resource rate efficiency;
[0045] The method for selecting a PRB template periodically or aperiodically refers to: selecting a PRB template based on the CQI fed back by the UE in combination with the service type...
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Abstract
The invention discloses a method for allocating physical resource blocks based on an orthogonal frequency division multiplexing (OFDM) system, which comprises: (1) setting physical resource blocks with different sizes at Node B of the OFDM system; (2) after being accessed to the system, a user terminal sends a service request to the Node B, and the Node B receives the service request and allocates a physical resource block with a proper size to the user terminal within the physical resources for allocation according to the service parameters fed back from the user terminal, thereby resulting in highest efficiency of allocation of the physical resource block to the terminal; and (3) the Node B transmits data to be transmitted to the user terminal according to the allocated physical resource block. The inventive method can flexibly allocate physical resource blocks according to the channel quality indicator (CQI) feedback and the service type of the terminal, thereby maximizing the utilization ratio of physical resources by the user terminal and save bandwidth resources.
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