Random access method and device

A random access and random access preamble technology, applied in the field of communication, can solve the problems of increased access conflicts and complex overheads, reduce access overhead and delay, avoid random access resource competition, and increase access speed Effect

Inactive Publication Date: 2011-10-12
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0030] Due to the fixed position of this type of user terminal, the absolute time adjustment amount of its uplink synchronization is also fixed. Even if the user terminal is disconnected and restarted, the original absolute time adjustment amount of uplink synchronization can still be used; increase, it puts a lot of pressure on the random access resources on the network side, and greatly increases the probability of access conflicts. Therefore, for this new type of terminal, the existing uplink initial synchronization process is complicated and expensive.

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Embodiment Construction

[0082] In practical applications, it may be assumed that the scenario of the embodiment is an LTE system, and there are a large number of user terminals serving as MTC devices in an LTE cell. These MTC devices include fixed-location MTC devices (such as water meters, electricity meters, home security monitoring devices, etc.), mobile MTC devices (portable health monitors, mobile POS machines, etc.).

[0083] The fast random access resources configured by the network side in the uplink radio resources may be statically configured or dynamically configured. image 3 That is an example including static and dynamic allocation of fast random access resources. image 3 Among them, the position of the statically configured fast random access resource is fixed to the (0, 2, 5, 8) subframe of each radio frame, the size is fixed to 6 RBs (Resource Block, resource block), and the position is fixed from RB4 (numbered starting from 0). RB0-RB2 are physical uplink control channel (Physical ...

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Abstract

The invention discloses a random access method and device. A fast random access preamble is set for each user terminal which can be fast randomly accessed, and fast random access resources are distributed; the fast random access of the user terminal which can be fast randomly accessed can be realized by using the fast random access preamble set for the user terminal and the distributed fast random access resources. By using the method and device provided by the invention, relatively independent fast random access preambles and resources can be provided for special types of user terminals which can not lose uplink synchronization so that the fast random access relative to common random access in the prior art can be realized, the access expenses and delay of fixed types of terminals can be obviously reduced, the access speed is obviously increased, the competition with the random access resources of other types of terminals can also be avoided, and the access conflict probability at a network side is greatly reduced.

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 Evolved Universal Terrestrial Radio Access Network (E-UTRAN) of the third-generation mobile communication Long Term Evolution (LTE) system, the uplink data share the channel through the physical uplink (Physical Uplink Shared Channel, PUSCH) transmission. An evolved base station (Evolved NodeB, eNB) allocates uplink radio resources to each user terminal (User Equipment, UE). The access technology adopted by E-UTRAN is Orthogonal Frequency Division Multiplexing (OFDM) technology. Compared with the second-generation mobile communication system, the radio resource management of E-UTRAN system has large bandwidth and multiple time processes. Its wireless resources appear in two dimensions of time and frequency, and the number of users that can be carried is greatly increased. [0003] In the LTE system, the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W74/002H04W74/0833
Inventor 戴谦张银成
Owner ZTE CORP
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