Random access method and system

A random access and physical access technology, applied in electrical components, wireless communication, etc., can solve the problem of prolongation of access time, and achieve the effect of reducing delay and high uplink transmission rate

Inactive Publication Date: 2010-11-03
TD TECH COMM TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] It can be seen that if E-DCH is used for uplink transmission, although compared with PRACH, the transmission can be improved, but the E-DCH access process requires two interactions between UE and Node B, which makes the access delay longer

Method used

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0040] In the embodiment of the present invention, the UE is pre-assigned the multiple access code SYNC_UL code and resource authorization information used for the E-DCH random access of the present invention, and the Node B sends the FPACH message to the UE through the FPACH after receiving the SYNC_UL message sent by the UE. The FPACH message carries the indication information of E-DCH random access; the UE obtains authorized resources and implements random access according to the received indication information and the pre-acquired E-DCH resource authorization information.

[0041] figure 2 It is a schematic flow chart of the E-DCH random access method in the present invention. Such as figure 2 shown, including the following steps:

[0042] Step...

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Abstract

The invention discloses a random access method. The method is characterized in that uplink synchronous SYNC_UL codes and resource-authorization messages used for reinforcing E-DCH random access in an uplink dedicated channel are primarily distributed for user equipment, after a base station receives SYNC_UL messages transmitted through the user equipment, FPACH messages are transmitted to the user equipment through a fast physical access channel, and indication messages of the E-DCH random access are carried in the FPACH messages; and the user equipment obtains authorized resources and realizes the random access according to the received indication messages and the authorized resource messages obtained in advance. An interaction is only required between the user equipment and the base station, so that higher uplink transmission rate is provided, and the time delay to access the user devices is shortened at the same time when the initial connection is established; therefore, a TD-SCDMAsystem can better support the high-speed transmission application such as Push-To-Talk (PoC and Push-To-Talk over C ellular). The invention also discloses a random access system.

Description

technical field [0001] The present invention relates to communication system random access technology, in particular to a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) system to realize enhanced uplink dedicated channel (E-DCH, Enhanced Dedicated Channel) Random access method and system. Background technique [0002] In the TD-SCDMA system, in the existing Enhanced CELL_FACH (Enhanced CELL_FACH, Enhanced CELL_Forward Access Channel) state, a Physical Random Access Channel (PRACH, Physical Random Access Channel) is used for uplink transmission, but the transmission rate is low. [0003] In order to increase the uplink transmission rate, the scheduled high-speed uplink packet access (HSUPA, High Speed ​​Uplink Packet Access) technology can be used for uplink transmission, and in the uplink direction of the TD-SCDMA system, an E- DCH, which can effectively increase the uplink transmission rate. Befo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
Inventor 常永宏陈迎贺刚
Owner TD TECH COMM TECH LTD
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