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Random access channel selection method and user equipment

A random access channel and pseudo-random technology, applied in connection management, wireless communication, electrical components, etc., can solve problems such as lack of flexibility, performance degradation, and weak adaptability

Active Publication Date: 2018-07-17
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the enhanced mobile broadband service with large bandwidth in the medium and high frequency bands of 5G, when the mapping method of random access channel resource allocation in LTE is relatively fixed, since it cannot provide frequency diversity gain, in the channel environment with strong frequency selectivity (fading channel) The performance of random access will degrade in
In addition, the resource allocation method of the random access channel in LTE is relatively simple, lacks flexibility, and has weak adaptability to some scenarios

Method used

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  • Random access channel selection method and user equipment
  • Random access channel selection method and user equipment
  • Random access channel selection method and user equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] see Figure 5 , this embodiment provides three random access channel selection methods:

[0094] Manner 1, the UE selects a random access channel designated by the base station for sending the preamble.

[0095] In the second manner, the UE randomly or pseudo-randomly selects a random access channel from all available random access channels with equal probability for sending the preamble.

[0096] Method 3: UE sorts and numbers all available random access channels (at least two random access channels with different frequency domain positions) according to the frequency domain direction from small to large to obtain indexes 0~K-1, according to the following rules An index is selected to select a random access channel corresponding to the index for sending the preamble.

[0097] no RA =g(K)

[0098] Among them, n RA Indicates the random access channel index used to send the preamble this time, g() indicates the pseudo-random number generation function, the function g...

Embodiment 2

[0130] In this embodiment, the UE selects a random access channel through the following process:

[0131] If the UE initiates the random access process for the first time (that is, the number of times the preamble sequence is repeatedly sent is 0, k=0), the random access channel is selected according to the method given in Embodiment 1.

[0132] If the UE does not initiate the random access process for the first time (that is, the number of times the preamble sequence is repeatedly sent is greater than or equal to 1, k≥1), then according to the random access channel information used last time and the random access configuration information in the random access configuration information Channel selection mode information, select a random access channel according to the following rules.

[0133] The UE sorts and numbers all available random access channels (at least two random access channels with different frequency domain positions) according to the frequency domain direction ...

Embodiment 3

[0176] see Figure 6, it is assumed in this embodiment that each available time slot for random access has only one random access channel in the frequency domain. There is a mapping relationship between the positions of the random access channels in the frequency domain in the time slots in which the preamble sequence is attempted to be sent before and after, and the base station notifies the UE of the mapping relationship through system information. The system information carrying the mapping relationship can be sent through the main information block in the broadcast channel, or through the system information block indicated by the main information block. The mapping relationship can also be preset in the UE to reduce signaling overhead.

[0177] In this embodiment, the UE selects a random access channel through the following process:

[0178] If the UE initiates the random access process for the first time (that is, the number of times the preamble sequence is repeatedly ...

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Abstract

The invention discloses a random access channel selection method. The method comprises the steps of obtaining information of a random access channel set, wherein the random access channel set comprises at least two random access channels with different frequency domain positions; randomly or pseudo randomly selecting a random access channel from the random access channels with the different frequency domain positions; and sending a preamble on the selected random access channel, thereby initiating a random access process. Compared with the prior art, the method has the advantages that the random access channel is selected in a random or pseudo random mode, a random access frequency hopping range is expanded to a whole system bandwidth, the relatively high frequency diversity gain is obtained, and the random access integrated performance is clearly improved. The invention also discloses the user equipment for random access channel selection.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, to a random access channel selection method and user equipment. Background technique [0002] The random access (Random Access, RA) process is an important step in establishing a communication link between the user side and the network side in a wireless communication system. ID used to identify the UE, etc. [0003] In LTE-TDD mode, there are multiple random access channels in the system, and the frequency domain position of the random access channel is determined by the parameter and f RA Decide. For preamble sequence formats 1-3, the determination method is: [0004] [0005] For preamble format 4, its determination method is: [0006] [0007] in, is the number of PRBs in the uplink system. From the above resource mapping method, in the TDD mode of LTE, when the UE tries multiple random access procedures, it may perform frequency ho...

Claims

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Application Information

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IPC IPC(8): H04W74/08
CPCH04W74/085H04W74/008H04W74/0833H04W76/11H04W72/0446H04W72/0453H04W74/02H04W72/563
Inventor 钱辰喻斌付景兴熊琦张英杰苏笛
Owner BEIJING SAMSUNG TELECOM R&D CENT
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