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Resource pre-scheduling method for device-to-device (D2D) communication system working under industrial scientific media (ISM) frequency bands

A communication system and pre-scheduling technology, applied in the field of communication, can solve the problems of data packet collision and the decrease of ISM frequency spectrum utilization rate, and achieve the effect of realizing resource competition and channel occupation, avoiding resource competition and ensuring fairness.

Inactive Publication Date: 2014-01-15
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no public solution that can solve this problem well
[0006] 2. If each LTE terminal "spontaneously" executes the CSMA / CA protocol to compete for the channel of the ISM frequency band as soon as it has D2D communication requirements, multiple D2D communication pairs will form a competitive relationship; as LTE with D2D communication requirements As the number of terminals increases, this "disorderly" competition will bring frequent data packet collisions (including collisions between D2D communication pairs and collisions between D2D communication pairs and WLAN users), resulting in spectrum utilization in the ISM band rate drops sharply
At present, there is no public solution that can solve this problem well

Method used

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  • Resource pre-scheduling method for device-to-device (D2D) communication system working under industrial scientific media (ISM) frequency bands
  • Resource pre-scheduling method for device-to-device (D2D) communication system working under industrial scientific media (ISM) frequency bands
  • Resource pre-scheduling method for device-to-device (D2D) communication system working under industrial scientific media (ISM) frequency bands

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment provides a resource pre-scheduling method for a D2D communication system operating in the ISM frequency band. The method is applied to LTE D2D communication operating in the ISM frequency band, including:

[0050] Step 1, the central control node in the cellular network determines the total amount of time-frequency resources available for D2D communication after each successful seizure of the ISM frequency band channel;

[0051] Step 2: Before initiating D2D communication, each D2D communication pair under the control of the central control node reports its resource occupation requirements to the central control node to which it belongs; the central control node calculates the time for scheduling the D2D communication pair according to the requirements. The amount of frequency resources;

[0052] Step 3: The central control node groups all the D2D communication pairs under its jurisdiction, and performs resource pre-scheduling for each D2D communication ...

Embodiment 2

[0082] This embodiment combines figure 2 In the scenario shown, the specific implementation of Solution 1 is explained. figure 2 A specific application scenario of a resource pre-scheduling method for a D2D communication system operating in the ISM frequency band is shown. The LTE D2D communication system (ie, the LTE D2D system) operating in the ISM frequency band consists of a central control node (such as a home base station) and It consists of multiple D2D communication pairs. The central control node is responsible for managing and coordinating the communication behavior of all D2D communication pairs within its signal coverage. D2D communication performs point-to-point direct communication on resources occupying the ISM frequency band, and competes with WLAN users for ISM frequency band resources under the control of the central control node.

[0083] This embodiment provides a hypothetical scenario without loss of generality: suppose there are N D2D communication pa...

Embodiment 3

[0104] This embodiment combines figure 2 In the scenario shown, the specific implementation of scheme 2 is explained. This method adopts the channel competition strategy based on the "subset priority sequence", and the content of the channel competition strategy based on the "subset priority sequence" is as follows: it is assumed that the future LTE D2D terminal can perceive Whether all WLAN channels on the ISM band are idle.

[0105] see Figure 5 The specific implementation steps of the resource pre-scheduling method of the D2D communication system working in the ISM frequency band provided by this embodiment are as follows:

[0106] S1', the central control node of the LTE D2D communication system determines the values ​​of the parameters BW and T, and informs each D2D communication pair under its jurisdiction.

[0107] S2', each D2D communication pair under the jurisdiction of the central control node (denoted as P i , i is the serial number of the D2D communication p...

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Abstract

The invention provides a resource pre-scheduling method for a device-to-device (D2D) communication system working under industrial scientific media (ISM) frequency bands. The method comprises the following steps that: step 1: a central control node in a cellular network determines the total quantity of time frequency resources available to device-to device (D2D) communication after industrial scientific media (ISM) frequency band channels are successfully seized; step 2: each device-to-device (D2D) communication pair under the administration of the central control node reports resource occupation requirements of the device-to-device (D2D) communication pairs to the central control node to which the device-to device (D2D) communication pairs belong, and the central control node calculates time frequency resources scheduled for the device-to-device (D2D) communication pairs according to the requirements; and step 3: the central control node groups all device-to-device (D2D) communication pairs which are under the administration of the central control node, and performs resource pre-scheduling on each device-to-device (D2D) communication pair in each group and ensures that the sum of the quantity of the time frequency resources scheduled to all the device-to-device (D2D) communication pairs is not larger than the total quantity of the time frequency resources. With the resource pre-scheduling method of the invention adopted, resource sharing between device-to-device (D2D) communication pairs which competitively seize WLAN channels and other device-to-device (D2D) communication pairs can be realized, and orderly resource competition and channel occupation can be also realized, and resource competition within each group and between each group can be avoided.

Description

technical field [0001] The invention belongs to the technical field of communication, relates to a resource scheduling method, in particular to a resource pre-scheduling method of a D2D communication system working in an ISM frequency band. Background technique [0002] The current cellular mobile communication system is a centralized communication network based on a preset infrastructure. The mobile terminals in the system are not allowed to conduct point-to-point direct communication, and the communication between terminals needs to be routed and forwarded through a wired backbone network or a central control node. Different from this centralized control communication method, D2D (Device to Device) communication is a novel technology applied to direct communication between terminals in the cellular system, which allows mobile terminals to use cellular system authorization under the control of the cellular system Frequency band for point-to-point communication. D2D communi...

Claims

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Application Information

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IPC IPC(8): H04W28/16H04W72/12
Inventor 周斌徐景郦振虹王海峰高春艳
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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