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Spectrum access method and device of secondary user in cognitive radio

A technology of cognitive radio and secondary user, applied in the field of network communication, can solve problems affecting system performance, unable to select the primary channel, access, etc., and achieve the effect of improving performance

Inactive Publication Date: 2015-06-17
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] It can be seen from the above-mentioned prior art scheme that the above-mentioned technical scheme assumes that the parameters of the Markov model are known and remain unchanged, but in the actual application scenario of CR, there may be multiple primary channels to choose from, while the secondary The user may not know the channel parameters of the model adopted by the multiple primary channels. In this case, the existing technical solutions cannot select the optimal primary channel for access, thus affecting the system performance

Method used

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  • Spectrum access method and device of secondary user in cognitive radio
  • Spectrum access method and device of secondary user in cognitive radio
  • Spectrum access method and device of secondary user in cognitive radio

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Embodiment 1

[0031] Embodiment 1: Embodiment 1 of the present invention provides a spectrum access method for secondary users in cognitive radio, such as Figure 4 Shown is a schematic flow chart of the method provided in this embodiment 1, the method comprising:

[0032] Step 41: Estimate and calculate the channel parameters of the primary channel according to the Markov model adopted by the primary channel.

[0033] In this step, first, according to the type of the Markov model adopted by the primary channel, the corresponding estimation calculation is selected, and then the corresponding estimation calculation is performed on the channel parameters of the primary channel. The type of the Markov model adopted by the primary channel may generally be a continuous-time Markov model or a discrete-time Markov model.

[0034] Taking the continuous-time Markov model as the primary channel as an example, the estimation of channel parameters can be divided into the following processes:

[0035]...

Embodiment 2

[0075] Embodiment 2: Embodiment 2 of the present invention provides a spectrum access device for secondary users in cognitive radio, such as Figure 5a Shown is a schematic structural diagram of the device provided by Embodiment 2 of the present invention, the device includes: a parameter estimation unit 51, a channel selection unit 52, a channel detection unit 53, and an access unit 54, wherein:

[0076] The parameter estimation unit 51 is configured to estimate and calculate the channel parameters of the primary channel according to the Markov model adopted by the primary channel. For a specific manner of performing channel parameter estimation and calculation, refer to the description in Embodiment 1 of the above method.

[0077] The channel selection unit 52 is configured to select the primary channel with the largest available bandwidth by using the channel parameters estimated by the parameter estimation unit 51 when there are multiple primary channels.

[0078] The cha...

Embodiment 3

[0084] Embodiment 3: Embodiment 3 of the present invention also provides a spectrum access system for secondary users in cognitive radio, such as Figure 6 Shown is a schematic structural diagram of the system provided by Embodiment 3 of the present invention, the system includes a secondary user 61 and a primary user 62, wherein:

[0085] The secondary user 61 is used to estimate and calculate the channel parameters of the model according to the Markov model adopted by the primary channel; and when there are multiple channels of the primary user, use the estimated channel parameters to select the channel with the largest available bandwidth; to detect the channel of the selected primary user, and to access the idle channel to transmit data after detecting that the channel is idle.

[0086] The primary user 62 is used to transmit data by using its own wireless spectrum resources.

[0087] In addition, the secondary user 61 also includes: a transmission time acquisition unit 6...

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Abstract

The embodiment of the invention provides a spectrum access method and a device of a secondary user in a cognitive radio. Firstly, channel parameters of a primary channel are estimated and calculated according to a markov model used by the primary channel, when a plurality of primary channels exist, the primary channel with maximum available bandwidth is selected according to the estimated channel parameters, the selected primary channel is detected, and when the channel is detected to be idle, the idle channel is accessed to transmit data. Accordingly, when a plurality of primary channels exist, an optimal primary channel is selected according to estimation of channel parameters to access to the optimal primary channel, higher data transmission requirements can be met, and the system performance is improved.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a spectrum access method and device for secondary users in cognitive radio. Background technique [0002] In the wireless communication system, the most important thing is the wireless spectrum resource, and the spectrum in the existing network is allocated by the wireless management committee for different communication systems. Under this constraint, many precious frequency band resources are not fully utilized. In many applications, the communication rate of many systems is constrained by the bandwidth limitation of the available spectrum. Therefore, a Cognitive Radio (CR, Cognitive Radio) system is proposed in the prior art in order to better utilize wireless spectrum resources. [0003] In the CR system, primary users and secondary users are usually distinguished. Primary users have wireless spectrum resources, and secondary users can use the spectrum hole of the primar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/00
Inventor 甘小莺龙鑫张炜周元
Owner HUAWEI TECH CO LTD
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