CN108200597B - DCI descrambling analysis method of LTE-A air interface monitor - Google Patents
DCI descrambling analysis method of LTE-A air interface monitor Download PDFInfo
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- CN108200597B CN108200597B CN201711364127.1A CN201711364127A CN108200597B CN 108200597 B CN108200597 B CN 108200597B CN 201711364127 A CN201711364127 A CN 201711364127A CN 108200597 B CN108200597 B CN 108200597B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/04—Interfaces between hierarchically different network devices
- H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface
Abstract
The invention discloses a DCI descrambling analysis method of an LTE-A air interface monitor, which belongs to the field of signaling monitoring of a mobile communication system. The invention is designed aiming at a DCI descrambling method of an LTE-A air interface monitor, the LTE-A air interface monitor does not need to access a terminal and a base station in the test process, DCI scheduling in the LTE-A air interface process is analyzed in real time under a wireless environment, uplink/downlink signaling between the terminal and the base station is analyzed in real time through LTE-A air interface signals, and the real-time wireless monitoring of the LTE-A air interface is realized and is used for problem analysis and positioning when the terminal and the base station are interconnected.
Description
Technical Field
The invention belongs to the field of signaling monitoring of a mobile communication system, and particularly relates to a DCI descrambling analysis method of an LTE-A air interface monitor.
Background
LTE-a (LTE-Advanced) is an evolution of LTE, a standard that 3GPP has proposed in order to meet the requirements of IMT-Advanced. Because the LTE technology has obvious technical characteristics of 4G, under the condition of meeting the IMT-Advanced requirement, the LTE-A is mainly used for enhancing the LTE system to achieve the peak rates of 1Gbit/s at the downlink and 500Mbit/s at the uplink, and the applied key technologies mainly comprise enhanced uplink and downlink MIMO, coordinated multi-point transmission/reception (CoMP), Relay technology (Relay), multi-carrier aggregation technology (CA) and the like.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a DCI descrambling analysis method of an LTE-A air interface monitor, which has reasonable design, overcomes the defects of the prior art and has good effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a DCI (Downlink Control Information) descrambling analysis method of an LTE-A air interface monitor adopts an RNTI state machine, which consists of an SI-RNTI state, an RA-RNTI state, a TC-RNTI state and a C-RNTI state;
the DCI descrambling analysis method of the LTE-A air interface monitor specifically comprises the following steps:
step 1: software initialization, enabling an RNTI state machine to enter an SI-RNTI state, descrambling DCI by using the SI-RNTI in the state, and waiting for receiving system information; wherein, the transmission of the system information is completed by DCI scheduling scrambled by using SI-RNTI;
step 2: once the system information is received, the RNTI state machine enters an RA-RNTI state, the DCI is descrambled by using the RA-RNTI state, and the receiving of the message 1, namely the random access preamble and the message 2, namely the random access response is waited, wherein the message 1 and the message 2 are completed by the DCI scheduling scrambled by using the RA-RNTI;
and step 3: once the message 1 and the message 2 are received, the RNTI state machine enters a TC-RNTI state, the DCI is descrambled by using the TC-RNTI state, the message 3, namely the RRC connection request, and the message 4, namely the RRC connection establishment, are waited to be received, and the message 3 and the message 4 are completed by using the DCI scheduling scrambled by the TC-RNTI;
and 4, step 4: and once the message 3 and the message 4 are received, the RNTI state machine enters a C-RNTI state, the DCI is descrambled by using the C-RNTI in the state, and the subsequent messages between the terminal and the base station are all finished by using the DCI scrambled by the C-RNTI for scheduling.
The invention has the following beneficial technical effects:
the invention is designed aiming at a DCI descrambling method of an LTE-A air interface monitor, the LTE-A air interface monitor does not need to access a terminal and a base station in the test process, DCI scheduling in the LTE-A air interface process is analyzed in real time under a wireless environment, uplink/downlink signaling between the terminal and the base station is analyzed in real time through LTE-A air interface signals, and the real-time wireless monitoring of the LTE-A air interface is realized and is used for problem analysis and positioning when the terminal and the base station are interconnected.
Drawings
Fig. 1 is a schematic diagram of the working principle of the RNTI state machine.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
a DCI descrambling analysis method of an LTE-A air interface monitor adopts an RNTI state machine, which consists of an SI-RNTI state, an RA-RNTI state, a TC-RNTI state and a C-RNTI state; the working principle is shown in figure 1.
The DCI descrambling analysis method of the LTE-A air interface monitor specifically comprises the following steps:
step 1: software initialization, enabling an RNTI state machine to enter an SI-RNTI state, descrambling DCI by using the SI-RNTI in the state, and waiting for receiving system information; wherein, the transmission of the system information is completed by DCI scheduling scrambled by using SI-RNTI;
step 2: once the system information is received, the RNTI state machine enters an RA-RNTI state, the DCI is descrambled by using the RA-RNTI state, and the receiving of the message 1, namely the random access preamble and the message 2, namely the random access response is waited, wherein the message 1 and the message 2 are completed by the DCI scheduling scrambled by using the RA-RNTI;
and step 3: once the message 1 and the message 2 are received, the RNTI state machine enters a TC-RNTI state, the DCI is descrambled by using the TC-RNTI state, the message 3, namely the RRC connection request, and the message 4, namely the RRC connection establishment, are waited to be received, and the message 3 and the message 4 are completed by using the DCI scheduling scrambled by the TC-RNTI;
and 4, step 4: and once the message 3 and the message 4 are received, the RNTI state machine enters a C-RNTI state, the DCI is descrambled by using the C-RNTI in the state, and the subsequent messages between the terminal and the base station are all finished by using the DCI scrambled by the C-RNTI for scheduling.
The LTE-A air interface monitor does not need an access terminal and a base station, and DCI scheduling in the LTE-A air interface process is analyzed in real time under a wireless environment.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (1)
1. A DCI descrambling analysis method of an LTE-A air interface monitor is characterized in that: an RNTI state machine is adopted and consists of an SI-RNTI state, an RA-RNTI state, a TC-RNTI state and a C-RNTI state;
the DCI descrambling analysis method of the LTE-A air interface monitor specifically comprises the following steps:
step 1: software initialization, enabling an RNTI state machine to enter an SI-RNTI state, descrambling DCI by using the SI-RNTI in the state, and waiting for receiving system information; wherein, the transmission of the system information is completed by DCI scheduling scrambled by using SI-RNTI;
step 2: once the system information is received, the RNTI state machine enters an RA-RNTI state, the DCI is descrambled by using the RA-RNTI state, and the receiving of the message 1, namely the random access preamble and the message 2, namely the random access response is waited, wherein the message 1 and the message 2 are completed by the DCI scheduling scrambled by using the RA-RNTI;
and step 3: once the message 1 and the message 2 are received, the RNTI state machine enters a TC-RNTI state, the DCI is descrambled by using the TC-RNTI state, the message 3, namely the RRC connection request, and the message 4, namely the RRC connection establishment, are waited to be received, and the message 3 and the message 4 are completed by using the DCI scheduling scrambled by the TC-RNTI;
and 4, step 4: and once the message 3 and the message 4 are received, the RNTI state machine enters a C-RNTI state, the DCI is descrambled by using the C-RNTI in the state, and the subsequent messages between the terminal and the base station are all finished by using the DCI scrambled by the C-RNTI for scheduling.
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