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Access optimization method based on NR-5G small base station

A technology of NR-5G and optimization method, which is applied in the field of UE access optimization, can solve optimization problems, achieve the effect of improving transceiver performance and reducing access process overhead

Inactive Publication Date: 2022-03-29
四川创智联恒科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above two patents describe the access optimization method from different dimensions, and do not use the method of calculating TA value to optimize the UE access process in the case of small 5G small base station coverage.

Method used

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  • Access optimization method based on NR-5G small base station
  • Access optimization method based on NR-5G small base station
  • Access optimization method based on NR-5G small base station

Examples

Experimental program
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Effect test

Embodiment 1

[0033] In this example, if figure 1 As shown, an access optimization method based on NR-5G small base station mainly includes the following steps:

[0034] Step 1: The physical layer of the base station demodulates the Prach signal on the time-frequency resource of the physical random access channel Prach to obtain Preamble-ID and TA values;

[0035] Step 2: The physical layer of the base station converts the distance from the UE to the base station through the TA value, and judges whether the distance is greater than the coverage radius of the base station. If so, discard the Preamble-ID and TA values ​​and do not report them to the upper layer. Otherwise, report the Preamble-ID and TA values. TA value to high level;

[0036] Step 3: If the upper layer receives the Preamble-ID reported by the physical layer, it sends Msg2 to the UE, otherwise it does not send Msg2.

[0037] In this example, if figure 2 As shown, taking the small base station in the NR-5G cell as the appli...

Embodiment 2

[0052] This embodiment mainly describes in detail the process of demodulating the Prach signal on the time-frequency resources of the physical random access channel Prach in the first embodiment.

[0053] In NR-5G, after the UE obtains the resource information of sib1 through downlink synchronization, it starts to perform uplink synchronization. The first step is to perform random access. The gNodeB obtains the Preamb-ID by demodulating the PRACH signal, and estimates the distance TA (Timing Advance) from the UE to the gNodeB. After the physical layer of the gNodeB is processed by the algorithm, it reports the Preamble-ID and TA to the upper layer, and the MAC packs the Preamble-ID and TA into the MCE and informs the UE through Msg2.

[0054] Since the sub-carrier of long format Prach is 1.25 kHz, the common system sub-carrier of NR-5G is 30 kHz. Therefore, the TA calculation adopts the IFFT of 4096 points on the 839-point frequency-domain sequence to complete the time-domain...

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Abstract

The invention discloses an access optimization method based on an NR-5G small base station, and the method comprises the steps: demodulating a Prach signal on a time-frequency resource of a physical random access channel Prach through a base station physical layer, obtaining a preamble-ID and a TA value, then converting the distance between UE and the base station through the TA value, judging whether the distance is larger than the radius of a coverage range of the base station, if yes, discarding the preamble-ID and the TA value, and not reporting the preamble-ID and the TA value to a high layer, and if not, not reporting the preamble-ID and the TA value to the high layer; if not, the Preamble-ID and the TA value are reported to the high layer, if the high layer receives the Preamble-ID reported by the physical layer, the Msg2 is sent to the UE, and if not, the Msg2 is not sent. According to the invention, the access possibility and reliability of the current UE can be judged through the TA value calculated by the PRACH received by the base station under the condition that the coverage range of the 5G small base station is small, and the access process of the base station is optimized.

Description

technical field [0001] The present invention relates to the technical field of 5G mobile communication, and in particular to a UE access optimization method in the case of a small coverage area of ​​a 5G small base station. Background technique [0002] In 4G / 5G communication, after the UE completes the downlink synchronization, it will start the random access process by sending the uplink PRACH signal. The PRACH signal is msg1 in the access process. The base station obtains the Preamble-ID by demodulating the PRACH signal at the corresponding time-frequency resource position and calculates the arrival time TA (Timing Advance). Then the base station sends RAR (Random Access Response) to the UE: the base station packages the Preamble-ID and TA values ​​through the MAC CE (MAC Control Element), sends them to the UE through the PDSCH channel, and informs the UE of the Preamble-ID and TA received by the current base station, This step is Msg2. After receiving Msg2, the UE chec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04W74/00H04W74/08
CPCH04W56/0045H04W74/004H04W74/006H04W74/0833H04W74/0866
Inventor 邓翔
Owner 四川创智联恒科技有限公司