Method and base station for identifying downlink component carrier in random access process

A random access process and component carrier technology, applied in wireless communication, electrical components, etc., can solve problems such as waste of system resources

Inactive Publication Date: 2009-07-08
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method and base station for identifying downlink component carrier in random access process
  • Method and base station for identifying downlink component carrier in random access process
  • Method and base station for identifying downlink component carrier in random access process

Examples

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Embodiment 1

[0074] Suppose an LTE-A system works in FDD mode, there are 2 downlink component carriers, the bandwidth of each downlink component carrier is 20MHz, and there is 1 uplink component carrier, the bandwidth is 20MHz, such as Figure 6 shown.

[0075] The broadcast channels of downlink component carriers 1 and 2 broadcast the following information (not limited to the following information)

[0076] 1) Frequency location information and bandwidth of the uplink component carrier 1.

[0077] 2) Physical random access channel configuration parameters on the uplink component carrier 1.

[0078] If a terminal is downlink synchronized to downlink component carrier 1, the terminal sends a random access preamble on uplink component carrier 1. After receiving the random access preamble sent by the terminal, the base station detects the uplink timing advance of the terminal, and sends the timing advance to the terminal through a random access response. Since it cannot be determined that ...

Embodiment 2

[0082] Suppose an LTE-A system works in FDD mode, there are 2 downlink component carriers, the bandwidth of each downlink component carrier is 20MHz, and there is 1 uplink component carrier, the bandwidth is 20MHz, such as Figure 8 shown.

[0083] The broadcast channels of downlink component carriers 1 and 2 broadcast the following information (not limited to the following information)

[0084] 1) Frequency location information and bandwidth of the uplink component carrier 1.

[0085] 2) Physical random access channel configuration parameters on the uplink component carrier 1.

[0086] If a terminal is downlink synchronized to downlink component carrier 1, the terminal sends a random access preamble on uplink component carrier 1. After receiving the random access preamble sent by the terminal, the base station detects the uplink timing advance of the terminal, and sends the timing advance to the terminal through a random access response. Since it cannot be determined that ...

Embodiment 3

[0090] Suppose an LTE-A system works in FDD mode, there are 5 downlink component carriers, and the bandwidth of each downlink component carrier is 20MHz, and there are 2 uplink component carriers, and the bandwidth of each uplink component carrier is 20MHz, such as Figure 10 shown.

[0091] The broadcast channels of downlink component carriers 1, 2, and 3 broadcast the following information (not limited to the following information)

[0092] 1) Frequency location information and bandwidth of the uplink component carrier 1.

[0093] 2) Physical random access channel configuration parameters on the uplink component carrier 1.

[0094] The configuration parameters of the physical random access channel on the uplink component carrier 1 broadcast on the downlink component carriers 1 and 2 are the same, that is, the configuration index of the physical random access channel is 9 (the format of the corresponding physical random access channel is 0, in the uplink sub-carrier Frame 1...

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Abstract

The invention provides a method for marking downward ponderance carrier wave in a random access process, which comprises that: after receiving a random access precursor transmitted by a terminal, a base station transmits a random access response corresponded with the random access precursor, and on all the transmitted downward ponderance carrier wave corresponded with the random access response, different channel resource allocation information is carried in the random access response transmitted on different downward ponderance carrier waves; after receiving a first dispatching uplink Msg. 3, the base station determines the downward ponderance carrier wave synchronous with the terminal based on resource of physical upward shared channel taken up by the Msg. 3. The invention also provides a base station for marking the downward ponderance carrier wave in the random access process. The method for marking downward ponderance carrier wave in a random access process marks the downward ponderance carrier wave by means of channel resource allocating information of the random access response and implicitly transmits the marking by means of resource of the Msg.3, thus enables the base station to determine the downward ponderance carrier wave synchronous with the terminal.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and a base station for identifying downlink component carriers in the random access process of an LTE-A system. Background technique [0002] Random access (Random Access) is an access process before a terminal starts communicating with a network. Such as figure 1 As shown, in the random access process of the LTE (Long Term Evolution, Long Term Evolution) system, the terminal sends a random access preamble (random access preamble) to the base station on a physical random access channel (Physical Random Access Channel, PRACH for short). After receiving the random access preamble sent by the terminal, the base station uses the sequence contained in it to calculate the timing advance, and allocates channel resources (called uplink scheduling grant, UL grant) and temporary C- RNTI (CellRadio Network Temporary Identifier, Cell Radio Network Temporary Identifier). The ra...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W74/08
Inventor 朱鹏郝鹏喻斌
Owner ZTE CORP
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