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Random access method and device and user equipment

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

Active Publication Date: 2017-11-21
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide a random access method, device, and user equipment UE, so as to at least solve the problem of optimizing random access of UE in the related art

Method used

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  • Random access method and device and user equipment
  • Random access method and device and user equipment
  • Random access method and device and user equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] In this preferred embodiment, a method for adding a preamble code used in a non-contention random access mode is provided.

[0136] The function of transmitting the Preamble code during the random access process is to tell the base station eNodeB that there is a random access request, and enable the base station eNodeB to estimate the transmission delay between it and the UE, so that the base station eNodeB can calibrate the uplink timing and pass the calibration information through the TA Command tells UE. Among them, the Preamble is transmitted on the PRACH.

[0137] In the related LTE technology, there are 64 available preamble sequences in each cell. Among the 64 available Preamble sequences, the Preamble sequences used for contention-based random access and the Preamble sequences used for non-contention-based random access are divided as follows: PreambleIndex#0~#51 are used for contention-based random access scenarios Use; Preamble Index#52~#63 are used in non-con...

Embodiment 2

[0169] This preferred embodiment provides a method for determining PRACH time domain resources.

[0170] Method 1: PRACH time domain resources are configured through higher layer RRC.

[0171] Based on method 1, at least one of the following implementation methods:

[0172] Mode 1: High layer RRC signaling configures a PRACH time domain position pattern.

[0173] Wherein, for the PRACH time-domain position pattern configured by the high-layer RRC, there are two usage methods: one is: once the PRACH time-domain pattern is configured by the high-layer RRC, it will take effect immediately. The other is: once the PRACH time domain pattern is configured by the high-level RRC, it will not take effect immediately, only when the physical layer DCI signaling (for example, UE-specific DCI signaling; public DCI signaling, group DCI signaling, DL grant, new design DCI signaling) triggers at least one time domain position in the PRACH time domain pattern to take effect. Or, at least one...

Embodiment 3

[0194] This preferred embodiment provides a method for determining PRACH frequency domain resources.

[0195] According to the control requirement of at least 80% of the bandwidth in the transmitted signal in ETSI, the PRACH frequency domain resource in the existing LTE technology only occupies 6 PRBs, which does not meet the control requirement of the bandwidth in ETSI. Based on this, LAA supports discretization of 6 PRBs in the PRACH frequency domain to the entire bandwidth. Among them, the manner in which the 6 PRBs are extended to the entire bandwidth includes: repeating z times in the frequency domain.

[0196] Based on this, the method for determining the frequency domain resources of the PRACH in the LAA includes at least one of the following:

[0197] Method 1: High-level RRC signaling configures the starting PRB or RE position index of the PRACH frequency domain resource, and / or, the starting PRB or RE position index set of the PRACH frequency domain resource, and / or...

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Abstract

The invention provides a random access method and device and user equipment. The random access method comprises the steps of determining listen before talk (LBT) priority levels for executing an LBT mechanism corresponding to messages sent during a random access process, and / or LBT priority levels of an LBT mechanism corresponding to different physical random access channels (PRACHs); sending the messages for random access according to the determined LBT priority levels corresponding to the messages and / or the LBT priority level corresponding to different PRACH formats after successfully executing the LBT mechanism. According to the invention, a problem in the related art that optimization is required to be performed on random access of UE is solved, and the effects of optimizing the random access and improving the random access success rate are achieved.

Description

technical field [0001] The present invention relates to the communication field, and in particular, to a random access method, device and user equipment (User Equipment, UE for short). Background technique [0002] With the rapid growth of data services, the pressure of data transmission on the carrier of the licensed spectrum is also increasing. Therefore, using unlicensed spectrum carriers to share the data traffic in licensed carriers becomes an important evolution direction in the subsequent development of Long Term Evolution (LTE for short). Among them: unlicensed spectrum has the following characteristics: free / low cost; low access requirements, low cost; large available bandwidth; resource sharing; and so on. [0003] In the standardization research process of Licensed Assisted Access (LAA for short), the random access procedure is being studied as an important topic. The purpose of introducing the random access process on the LAA Scell ​​(primary cell): For the sce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W74/0833H04W74/085H04W74/0808H04W72/23H04W76/11H04W76/27H04W72/0446H04W74/02H04W80/02
Inventor 杨玲赵亚军苟伟
Owner ZTE CORP
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