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A method and device for allocating physical random access channel prach resources

A physical random access and random access technology, applied in the field of communication, can solve problems such as interference between users

Active Publication Date: 2020-01-14
COMBA TELECOM SYST CHINA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Embodiments of the present invention provide a physical random access channel PRACH resource allocation method and device to solve the problem of inter-user interference under different root sequences in the prior art

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  • A method and device for allocating physical random access channel prach resources
  • A method and device for allocating physical random access channel prach resources
  • A method and device for allocating physical random access channel prach resources

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Embodiment Construction

[0070] In order to make the objectives, technical solutions, and beneficial effects of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0071] It should be understood that the technical solutions of the embodiments of the present invention can be applied to an LTE (Long Term Evolution, Long Term Evolution) system. In the LTE system, random access is a basic function, and the UE (User) can only use random access. In the process, after synchronizing with the uplink of the LTE system, it can be scheduled by the LTE system for uplink transmission. Among them, in the LTE system, the process of random access is: (1) UE sends random access preamble sequence to eNB (Evolved Node B); (2) eNB detects that UE sends access pream...

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Abstract

The embodiments of the present invention relate to the field of communication technologies, and in particular to a method and device for allocating resources of a physical random access channel (PRACH), which are used to solve the problem of inter-user interference under different root sequences. In the embodiment of the present invention, the noise estimation is performed on the time-frequency domain signal of the PRACH resource, and the noise estimate of the time-frequency domain signal of the PRACH resource is determined; according to the noise estimate, the estimated number of users who initiate the PRACH is determined; according to the estimated number of users of the PRACH , adjusting the number of PRACH resources, so as to adjust the number of PRACH resources according to the estimated number of users who initiate the PRACH, thereby effectively reducing the interference between users under different root sequences in the PRACH resources.

Description

Technical field [0001] The embodiment of the present invention relates to the field of communication technology, and in particular to a method and device for allocating physical random access channel PRACH resources. Background technique [0002] In the LTE (Long Term Evolution) system, a PRACH (Physical Random Access Channel) resource provides 64 preamble sequences to support up to 64 random access initiated by different users, 64 preambles The sequence is generated by the ZC (Zadoff-Chu) sequence through cyclic shift. Specifically, the 64 preamble sequences first use a ZC sequence to generate an N of length 839 ZC Sequence, then cyclically shift length to N CS Parameter pair N ZC The sequence is cyclically shifted. If the shift step is large and not enough for 64 preamble sequences, the ZC sequence of the next root sequence is taken and the cyclic shift is continued until 64 preamble sequences are obtained. In short, when N CS When it is relatively large, a root sequence cann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/12H04W74/08
CPCH04W74/0833H04W72/54H04W72/535H04W72/20
Inventor 付杰尉郝秀娟
Owner COMBA TELECOM SYST CHINA LTD