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Random access method and device

A technology of random access and random access preamble, which is applied in the field of communication, can solve the problem of low success rate of random access and achieve the effect of improving the success rate

Active Publication Date: 2012-10-10
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that the success rate of random access rate is relatively low in the case of high speed and relatively large coverage radius, the present invention provides a random access method and device to at least solve this problem

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Embodiment 1

[0052] The embodiment of the present invention provides a method for realizing high-speed and large coverage, which meets the high-speed and large-coverage requirements of the air route coverage project.

[0053] The technical solution of this preferred embodiment is: in order to support a cell coverage radius of 100 km, the random access cyclic offset type RaNcsType can only be configured in a medium-low speed cell scenario. Random access can be divided into contention-based and non-contention-based. If the number of contention-based preambles is NumRAPreambles, then the number of non-competition preambles is: number of users in the cell - NumRAPreambles, see Table 3 for the number of users in the cell. Assume that a common cell in the aircraft coverage scheme has 5 logical root sequences, and NCS=0, that is, a cell has 5 signature sequences. Considering that the random access load of the competition is very low, most of them are handovers between aircraft cells (not contenti...

Embodiment 2

[0072] An embodiment of the present invention provides a random access method, Figure 5 It is the flow of random access according to the embodiment of the present invention Figure 1 ,Such as Figure 5 As shown, the method includes the following steps S502 to S512.

[0073] Step S502: Airline coverage adopts a super cell network.

[0074] Step S504: The eNB adopts PRACH format 3, low-speed cell mode configuration.

[0075] Step S506: The eNB assumes that the number of users (airborne stations) in a super cell does not exceed one.

[0076] Step S508: Send and configure NumRAPreambles to be 1 in the broadcast message, and configure RootSequenceStartNumber of adjacent super cells to be 1 and 2 respectively (neighboring cells cannot be configured the same).

[0077] Step S510: UE synchronizes to a super cell whose RootSequenceStartNumber is configured as 8.

[0078] Step S512: The UE initiates random access with the logical root sequence index number being 22, and successful...

Embodiment 3

[0080] An embodiment of the present invention provides a random access method, Figure 6 It is the flow of random access according to the embodiment of the present invention Figure II ,Such as Figure 6 As shown, the method includes the following steps S602 to S612.

[0081] Step S602: Airline coverage adopts a super cell network.

[0082] Step S604: The eNB adopts PRACH format 3, low-speed cell mode configuration.

[0083] Step S606: According to Table 3, the eNB assumes that the number of users (airborne stations) in a super cell does not exceed 3.

[0084] Step S608: Send and configure NumRAPreambles to 4 in the broadcast message, and configure RootSequenceStartNumbers of adjacent super cells to 7 and 8 respectively (neighboring cells cannot be configured the same).

[0085] Step S610: UE synchronizes to a super cell whose RootSequenceStartNumber is configured as 8.

[0086] Step S612: The UE selects one of the logical root sequence index numbers (2, 3, 826) to initia...

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Abstract

The invention discloses a random access method and device. The method comprises the following steps that: a base station configures the random accessed parameters, wherein the parameters at least include NumRAPreamble, the RootSequenceStartNumber corresponding to the NumRAPreamble, and the root index serial number group corresponding to the NumRAPreamble; and the base station notifies the UE of the parameters to trigger the UE for random access. By adopting the random access method and device disclosed by the invention, the random access rate of the terminal is raised.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a random access method and device. Background technique [0002] In the current Long-Term Evolution (LTE for short) protocol, LTE PRACH (Physical Random Access Channel, physical layer random access channel) is used to satisfy the random access request of the terminal, so that the terminal establishes a connection with the system . [0003] In the route coverage project, the dedicated base station on the ground is used to cover the air, and the mobile communication between the base station and the aircraft is directly realized. In order to reduce the cost of building a station, you can consider increasing the distance between stations, and at the same time reduce the switching frequency and improve the stability of wireless communication signals. The flight speed of the aircraft is 800-1200Km / h, and the maximum Doppler frequency deviation caused by this is about 1070Hz. In or...

Claims

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Application Information

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IPC IPC(8): H04W74/08
Inventor 陈继勋
Owner ZTE CORP
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