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Random access method and system of TD-LTE virtual private network based on dynamic priorities

A technology of dynamic priority and random access, applied in the field of communication

Active Publication Date: 2015-03-25
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In related articles, there are many studies on the back-off algorithm and priority division in LTE wireless access, but the priority is fixed by the system and each channel uses a single back-off algorithm

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  • Random access method and system of TD-LTE virtual private network based on dynamic priorities
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  • Random access method and system of TD-LTE virtual private network based on dynamic priorities

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Embodiment Construction

[0086] 1. In the present invention, after a UE (user equipment) selects a suitable cell to camp on, it can initiate an initial random access process. In the LTE system, random access is a basic function. UEs can only be scheduled by the system for uplink transmission after they are synchronized with the uplink of the system through the random access process. Random access in LTE is divided into contention-based There are two forms of random access and contention-free random access. The present invention is based on the random access process of contention, can be divided into four steps, promptly TD-LTE virtual private network of the present invention is based on the random access method of dynamic priority, comprises the following steps:

[0087] Preamble sequence transmission steps: UE reads the number of preamble sequences numberofRA-Preambles used for competing random access from the cell broadcast message SIB2, randomly selects a preamble sequence (random access preamble s...

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Abstract

The invention provides a random access method and system of a TD-LTE virtual private network based on dynamic priorities. The random access method comprises a leader sequence transmission step, the random access responding step, the MSG3 sending step and the conflict resolving message step. The random access method and system of the TD-LTE virtual private network based on dynamic priorities have the advantages that the method of combining different back off algorithms and the repeated time upper limit is adopted with different priorities to ensure that the average access delay of a high-priority user is short, and the call drop rate of the user is reduced at the same time; the priority classification mode is dynamically selected according to the system load condition to improve the throughput of a system and reduce the call drop rate.

Description

technical field [0001] The invention relates to the communication field, in particular to a dynamic priority-based random access method and system for a TD-LTE virtual private network. Background technique [0002] TD-LTE virtual trunking private network is a multi-purpose wireless communication system based on the TD-LTE public network and mainly used for command and dispatch according to the needs of specific users. Compared with the cluster communication system, the virtual cluster private network only needs to temporarily build a user group network with cluster functions on the basis of the existing public network according to user needs. This method has low construction cost and is easy to build and dismantle. The number is large, which increases the coverage of the virtual cluster system, and because the virtual private network is directly attached to the public network, it is convenient for unified maintenance and management. Different users have different requiremen...

Claims

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Application Information

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IPC IPC(8): H04W74/08
CPCH04W74/0841H04W74/0875
Inventor 张霆廷张钦宇邢学强崔文华李家香
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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