Upward vertical handoff method for channel preemption of heterogeneous network
A channel preemption and vertical switching technology, applied in wireless communication, electrical components, etc., can solve the problems of service quality degradation of business communication, increase of packet transmission delay, and lack of consideration of UVH mandatory, so as to improve the quality of voice communication service, improve The effect of switching performance and improving communication quality
Inactive Publication Date: 2012-06-13
TSINGHUA UNIV
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However, this solution will cause many online cellular calls with short call duration in the double coverage area to be forced to perform the DVH process because the occupied cellular channel is preempted, which may cause increased packet transmission delay and packet loss Even calls are dropped, resulting in a decline in the service quality of business communications
In addition, this scheme does not consider the mandatory nature of UVH, but gives UVH calls the same channel preemption rights as newly added cellular calls. As a result, the performance of UVH call loss rate cannot be further improved.
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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] The specific process of a heterogeneous network channel preemption upward vertical switching method proposed by the present invention is as follows: figure 2 shown, including the following steps:
[0034] 1) Prioritization of all types of calls waiting for a response in the single-cell coverage area:
[0035] 1-1) In the single-cell coverage area, for calls arriving at different times, and assuming that there is only one call at each time, the online cellular voice that can be preempted in the double coverage area is preempted in sequence according to the order of the call arrival time at the corresponding time The cellular channel occupied by the call;
[0036] 1-2) In a single-cell coverage area, for two or more calls arriving at the same time, define the priorities of UVH voice calls, UVH data calls, new voice calls, and new data ...
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The invention relates to an upward vertical handoff method for the channel preemption of a heterogeneous network, which belongs to the technical field of wireless communication. The method comprises the following steps: sequencing the priorities of all calls waiting for response in a single-cellular coverage area; defining the priorities of all online cellular voice calls in a double coverage area; sequencing channels preempted by all non-priority online cellular voice calls in the double coverage area; and carrying out channel preemption and handoff according to the priority sequence of all calls waiting for response in the single-cellular coverage area and the sequence of the channels preempted by all non-priority online cellular voice calls in the double coverage area. According to the method disclosed by the invention, the mandatory property of the upward vertical handoff and the instantaneity and delay sensitivity of a voice service are taken into full consideration, therefore, the method has the advantages of reducing the call loss rate of the upward vertical handoff, reducing the blocking rate of new calls in cellular cells and significantly improving the handoff performance of an intercommunicating system and the voice communication service quality of a mobile subscriber while keeping the high channel utilization rate of cellular cells.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a channel preemption upward vertical switching method of a heterogeneous network. Background technique [0002] Currently, in the field of wireless communication, multiple wireless networks coexist. With the continuous growth of people's demand for mobile access, the next-generation wireless communication technology is developing toward the realization of heterogeneous integration of various wireless networks. Cellular network and wireless local area network (WLAN) are the two most important wireless communication networks at present, and their respective characteristics are completely different. The cellular network has a large coverage area and low bandwidth. On the contrary, WLAN has a small coverage area and high bandwidth. Realizing the integration and intercommunication of the cellular network and the WLAN can make the advantages of the two comp...
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IPC IPC(8): H04W36/14
Inventor 粟欣曾捷刘力犹园
Owner TSINGHUA UNIV